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Structure and Principle of Automatic Feeder for Power Press

With the continuous progress of science and technology, the overall level of industrial automation has been greatly improved.

Automatic power press feeder is a kind of automatic equipment which supplies materials automatically and assists factory production. It is an indispensable part of human life and production. This paper mainly studies the transportation and loading positioning of the screw retaining ring by the automatic feeder for power press, and intellectualizes the control and improvement with the programmable logic programmer.

At present, the commonly used feeder, whether it is air feeder, roller feeder, NC feeder, gear feeder or high-speed clip feeder, is composed of material rack, leveling machine, feeding device (feeder), punch and continuous die, feeding device (feeder). These devices form complete automatic stamping Production line [1] along the direction of material feeding in turn. This paper studies the stamping and positioning accuracy of screw retaining ring press controlled by PLC and its development prospects and applications. Programmable processors are used to reduce errors. At the same time, reliability analysis and fault handling methods are studied to improve the processing accuracy and efficiency. 

Structure and Principle of Automatic Feeder for Power Press

The base of stamping machine and the base of automatic feeder for power press are fixed on the workbench. The part of automatic feeder for power press locates in the rear. The upper part of the overlook is the vibration tray and screw feeding track of the automatic feeder. The screw retainer or workpiece enters the screw feeding track through the vibration tray, and then enters the pre-pressing position along the screw feeding track. The motor which is used to drive the vibration tray is Servo AC motor. Servo AC motor has high precision and sensitivity. The motor is located at the base. The closed-loop system controls the overall stability of the automatic feeder for power press pressed under the screw retainer.

Firstly, the operator puts the worn lifting ring on the tooling, and the sensor detects the existence of the workpiece, and sends the detection signal to the PLC processor, which controls the action of the cylinder, and the device detects the total length of the bolt in real time. Start the equipment, and the workpiece has been pre-positioned, and the detection signal is transmitted to the PLC processor, which controls the action of the transmission device, and moves the screw retaining ring through the feeding device and the vibration disk [3]. When the positioning sensor detects that the workpiece is in a predetermined position, it transmits the signal to the control system. After receiving the signal, the control system transmits the instructions to the PLC processor to control the cylinder action. If it does not meet the requirements, the device does not start. On the contrary, the device starts and automatically sends the screw retaining ring to the top of the bolt, and the device starts to press down.

When the downward pressure of the equipment reaches the limit position of the workpiece, the total height of the fixtures (sleeve and gasket, etc.) on the bolt is detected by the displacement sensor. If the total height does not match the preset parameters of the equipment, the equipment will stop working by alarm; otherwise, the downward pressure will be completed. When the workpiece is processed, the PLC processor controls the clamping cylinder to loosen, and moves the workpiece to the appropriate position. It removes the processed workpiece, and puts it into the unprocessed workpiece, and circulate the processing like this. The pneumatic flexible clamping system mainly includes: control device, detection device, positioning device, clamping device and workpiece removal device.

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NC Servo Feeder

All main components of KINGLAN punch press servo feeder come from worldwide famous brands with CE CERTIFICATION, good quality and safety, such as full sets of Schneider low voltage components, Japan Mitsubishi PLC, Japan Yaskawa servo motor, etc.

NC Servo Roll Feeder Main Feature

1. High precision feeding: Aiming at the arrival of hi-tech industry, it is controlled by computer closed-circuit feedback system. So that the precision can maintain within +/-0.03mm.

2. Phase-style feeding function: It can input 20 groups of different feeding length, each group provides punching for 999 times to satisfy the processing and production of special products (option)

3. Manual model: It can input 3 phases manual speed, which can let used operate more easily and feed materials more accuracy.

4. High efficiency release device: It can set up release angle quickly, only match cam signal and adjusted feed thickness can done.

5. Feeding length setting: Input feed length on the controller panel directly.

6. Feeding unit: The roll adopts middle-hollow style. Being light and with low inertia for electroplate. The surface hardness HRC is 60 and hard chrome plated.

NC Servo Feeder Working Principle

NC feeder is also known as the servo feeder. It is an automatic equipment that realizes accurate feeding by rollers through a synchronous pulley driven by a complete CNC system such as PLC, servo motor and servo driver.

According to the different relaxation actions, NC feeder is generally divided into two categories: pneumatic NC feeder and mechanical NC feeder. The feeding principle of these two feeders is exactly the same; the difference is how to achieve the relaxation action.

The control system of the NC servo feeder machine consists of PLC, servo system and touch screen. PLC can improve the stability of the control system and enhance the anti-interference ability of the system. The servo system can accurately position the mechanical movement and improve the accuracy of the mechanical transmission. The touch screen can visually display and modify NC feeder parameters which simplify on-site operation.

PLC is the core component of NC servo feeder. KINGLAN NC feeder is equipped with Siemens PLC. It has built-in high-speed pulse output function, which can directly send quantitative pulse number to control servo drive operation. The servo driver controls the rotational position and speed of the servo motor according to the number of pulses and the channel emitted by the PLC pulse output terminal, thereby accurately giving the feed length. The touch screen can visually display various parameters of the system, providing users with a good human-interface screen and simplifying on-site operation.

When in the manual mode, the ACC (frequency acceleration/deceleration control) command is executed at the rising edge of the servo forward signal, and the mode control data is set to realize the CW (clockwise) direction rotation to make the servo motor rotate forward. At the falling edge of the servo forward signal, the INI (operation mode control) command is executed to stop the pulse output. The servo motor reversal situation can be analogized.

When in the automatic mode, the PLC sends a preset pulse to the servo drive, and the PLS2 (positioning) command is executed at this time.

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Mechanical Power Press

Our mechanical power press capacity ranges from 25ton to 2400ton and are manufactured in compliance with international industrial standards utilizing quality approved industry-famous accessories and continuously updated new technology. In order to ensure quality, our metal stamping press is strictly tested on various quality parameters by our expert quality controllers. With the efforts and dedication of our professionals along with the trust and support of our valued customers, our sheet metal stamping press has surpassed many of our competitors in terms of quality and services. We value so much what we have achieved today and will continue to work hard for much better future of our own staff and our customers.

Our mechanical power press parts advantages：

High precision

In strict accordance with Japanese JIS 1 grade accuracy standards, our press has better performance than domestic standard. All main components are processed through imported CNC equipments.

High rigidity, strong stability

Scientific structural design and high requirement welding processing make enough safety of our machine. Together with world top level overload automatic cut-off device, our machine is permanently guaranteed of free from deformation.

Smooth and durable running

The use of balance device allows the slider and mould to run without gravity.

High anti-eccentric ability

Long alloy cooper guide way assures slider moving more balance and smooth, ensuring more stable and long-term accuracy.

Low noise

All transmission gears are grinded by Germany brand precision grinding machine, guaranteeing their engagement ratio and improving high service life.

Stable and durable clutch and brake system

Advanced professional pneumatic clutch brake coupled with imported TACO solenoid valve gives itself high sensitivity and long service life, free from accidental like continuous stroke.

Superb quality overload protection device

World top level overload protection device can detect the exceeded pressure within 0.01s and quickly protect.

Stable and reliable electrical circuit

Authentic Japanese and Taiwan brand electrical components ensure stable and durable electrical circuit.

High quality sealing parts

All designated Japanese brand bearings and imported sealing parts, ensuring machine’s high precision and long service life.

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Compound Die

Compound die refers to a die structure in which a press machine completes blanking, punching and other processes in one stroke.

Compound Die Classification

(1)Blanking compound die set: such as blanking and punching or cutting and punching etc.

(2)Forming compound die: such as bending, extrusion etc.

(3)Blanking and forming compound die: such as blanking and deep drawing; punching and flanging; deep drawing and trimming; blanking, deep drawing, punching and flanging etc.

Compound Die Set Features

1. Production efficiency is highly increased.

2. Quality of stamping parts improved

3. Concentricity error of compound die is within +/-0.02 ~ +/-0.04mm.

4. High requirements for die manufacturing accuracy

Because the compound die stamping needs to complete several stamping processes in one die, the die structure is generally more complex than single station die. And the components require no interference, accuracy, and reliability during operation which requires a high manufacturing precision. Therefore, the manufacturing cost of the compound die is also increased, the manufacturing cycle is relatively extended, and the maintenance is not as simple as the single process.

Principles of Selecting Compound Dies

1.Volume production

2.High-volume is more suitable for using compound die.

3.Precision of stamping part

4.When the precision and concentricity of the stamping parts are highly required; the shape is complex, and repositioning the stamping part may produce large errors, the compound die should be considered.

5.The number of compound processes

Generally, the number of compounding processes for the compound die is less than four. More processes will cause die structures overly complex. At the same time, the strength, rigidity, and reliability of the die will also decrease, making it more difficult to manufacture and maintain.

Discharge and Knock off Device

In the compound die, since there are more actions to be completed in one stroke of the press, in order to simplify the mold structure, some auxiliary actions, such as discharging and knocking off are usually performed by using elastic devices. At the same time, the elastic device can also allow the stamped work piece to be pressed throughout the stamping process, so that the stamped work piece has better flatness.

Mold Base selection

Because the precision of the compound mold is higher, its mold base should also be selected with higher accuracy. The ball type mold base has the advantages of high precision and long service life compared with the slide type mold base, so the ball type is often used.

The mold seat in the mold base is often made of steel plate by replacing the ordinary cast iron

For complex compound dies that require high precision, spherical floating die shanks can be used to reduce the adverse effects of stamping equipment or die mounting errors on the die. It should be noted that when the floating shanks are used, the guide posts cannot leave the guide bush, otherwise severe machine and personal accidents may occur.

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C (Gap) Frame Crank Type Mechanical Stamping Press

Crank press machine uses crank slide block mechanism as working mechanism, machine driving system passes the movement and energy of electromotor to working mechanism, bringing forge to the die by slide block, in order to let roughcast engender transmutation. The gap frame power press is one of the categories of crank presses featuring an open frame, ie C frame or C body.

Because the c frame power press for sale has an open frame, it has outstanding advantages compared with the closed type press. The working table is open in three directions, it is convenient to install the mold and operate, and provides good conditions for mechanization and automation. Due to the convenient use of open type crank press, it is widely used in various industries. It is the main equipment in sheet metal stamping production. It can be used in punching, blanking, trimming, bending, shallow drawing and forming processes, and is widely used in national defense, aviation, automobiles, tractors, motors, electrical appliances, bearings, Instruments, agricultural machinery, agricultural tools, bicycles, sewing machines, medical equipment, daily hardware and other departments. In medium and small tonnage of presses, open type presses have been widely used and developed.

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ALP Single Crank C Frame Press

The ALP series of open-type fixed table presses are general-purpose presses for sheet metal stamping. They are suitable for various cold stamping processes such as shearing, punching, blanking, bending and shallow drawing. It is manufactured in strict accordance with Japanese JIS Class 1 accuracy standards and is superior to domestic standards.

The main components of our(c frame double crank press manufacturers ) c frame punch press are all processed by imported CNC equipments. Japanese high-quality bearings and imported oil seal linings ensure the accuracy and longevity of the machine.

C Frame Mechanical Punch Press Structural Characteristics

1.One-piece body, the body is welded with high-quality steel plate, tempered to eliminate internal stress.

2.The body guide rail adopts six-sided guidance and has high guiding precision.

3.Manual lubrication for 60 tons and below, automatic lubrication for 80 tons and above.

4.Dry clutch and wet clutch for option, integrated with brake system with anomaly detection.

5.Manual adjustment of slider height for 60 tons and below, electric adjustment for 80 tons and above, adjustment speed about 40mm/min, interlocking control of slider adjustment and balancer pressure, hydraulic protection and slider stroke.

6.Machine is equipped with two-hand operation buttons and emergency stop button.

7.Digital die height indicator, in-time to display die height.

8.Electronic crank angle display for the slider position at any time.

9.Air ejector device keeps your workpiece/scrap away from mold, protects the mold and improves production efficiency.

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ALD Single Crank Semi-closed Press

The ALD series is a semi-closed crank stamp press machine independently developed by KINGLAN to meet customer needs. It has the characteristics of small change of mold height, small deviation of dynamic center, small amount of stamping deformation, and low noise of blanking cutting. The fixed-lock six-sided guide rail and high-rigidity body realize high-precision stamping of the product, and the life of the mold is also greatly improved.

Stamp Press Machine Features:

1. Built-in transmission construction, no gear or flywheel injury to personnel

2. Emergency button can instantly stop the machine at any time, well handling unexpected accidents.

3. Safety loop device of two-hand operation requires synchronous press within 0.2s to get operated, protecting the safety of personnel.

4. Overload automatic protection device can instantly detect exceeded pressure and make an emergency stop within 0.01s, avoiding press, mould and personnel injury.

5. Cam failure detection circuit can effectively avoid dangerous accidents caused by cam wear.

6. The use of photoelectric safety device can make the machine emergency stop if detecting foreign matter into dangerous zone, avoiding danger.  

7. The interconnected control loop consisting of imported solenoid valve and cam device ensures correct movement of clutch, impossible occurrence of continuous stamping.

8. When brake pad wears causing long time braking and angle deflection, machine can automatically detect and give signal to avoid danger.

9. Electrical box’s power-off device (when open the door, power will be off) ensures the safety of electrical maintenance.

10. The safety net setting on the back of the machine guarantees the safety of personnel.

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Mechanical Press Machine Working Principle

The mechanical press machine design principle is to convert the circular motion into a linear motion, and the main motor outputs the force to drive the flywheel. The clutch drives the gear, the crankshaft (or the eccentric gear), the connecting rod, etc. to achieve the linear motion of the slider. The motion of the motor to the connecting rod is a circular motion. There is a need for a circular motion and a linear motion transfer point between the connecting rod and the slider. The design has roughly two mechanisms, one is a spherical type and the other is a pin type (cylindrical type), and the circular motion is performed via this mechanism to a linear motion of the slider. The presses release the force on the material to plastically deform it to obtain the required shape and precision. Therefore, it is necessary to match a set of molds (dividing the upper mold and the lower mold), placing the material between them, and applying pressure by the machine to make it deformed, the reaction force caused by the force applied to the material during processing is absorbed by the mechanical body of the press.

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"Double action presses are available in double action mechanical presses and double action hydraulic presses."

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Introduction of Pneumatic Punch Press Feeder

Description:  pneumatic press feeder is an earlier machine used for punch feeding. It has two forms: active feeding and passive pulling. Active feeding is suitable for general materials. Materials are fed into the die by feeder; passive pulling is suitable for thin or soft materials, mainly used for feeding products with low precision and low speed.

Performance characteristics:

1. Pneumatic punch press feeder is an earlier machine used for punch feeding. Its main characteristics are: simple operation, convenient installation and affordable price. It is mainly used in the delivery of products with low precision and low speed.2.This machine has two forms: active feeding and passive pulling. Active feeding is suitable for general materials, and materials are fed into the die by feeder; passive pulling is suitable for thin or soft materials. The feeder is installed in the direction of the outlet of the die, and material is pulled out by pneumatic punch press feeder to avoid material bending.3. Standard fittings have three combination sets (water filter, air filter, pressure regulation), one high-pressure pipe (connecting air source and air feeder air path, transmitting power source to feeder), one L-type installation plate (used to install air feeder on punch), one set of guide rod, one set of sealing ring and one buffer (AF-5C starting equipment), which can make rapid feeding achieve lower vibration effect).4. Standard pneumatic punch press feeder adopts the method of floating rod feeding, through the guide rod mounted on the slider, to complete the feeding action, and the machine itself does not have relaxation function. If the upstream and downstream journey of the press is too short or too long, the E-type feeding solenoid valve should be installed to replace the floating rod to complete the feeding; while the R-type relaxing solenoid valve is suitable for the case of high precision feeding, using the solenoid valve to relax the fixed splint to correct the error, the actual selection should be based on your specific needs.

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Application of Power Press Machine in Stamping Automated Production Technology

Stamping Automated Production Technology In the traditional stamping production line, sheet metal handling between front and rear equipment depends on manual fetching and placing. With the continuous improvement of production rhythm, manual feeding not only can not meet the needs of high rhythm, but also brings potential safety hazards. Because the personnel concentrate on improving the speed of taking and discharging materials, neglecting the harm of equipment movement, there are often accidents of equipment pressing into the hands and causing disabilities. Therefore, the automatic production line of manipulator instead of manual operation emerges at the historic moment.

Automated production, that is, the use of equipment instead of manual realization of the plate transportation between the front and rear part of press power machines. It not only avoids the risk of injury, but also improves the production efficiency by about 35%. After 2005, the automatic production technology of stamping parts in domestic automobile manufacturing enterprises sprang up like bamboo shoots after a spring rain, which opened the curtain of stamping automatic production.

Introduction of Main Production Process Parameters of the Press Power Machine

At present, the mainstream press power machine is mechanical closed press power machine, which can be used for blanking, forming, bending, calibration, shallow drawing and other cold stamping processes of sheet parts. The technological parameters of press are very important, which not only affect the forming quality of products, but also have a great impact on efficiency, cost and even safety. Following is a brief description of some important parameters and accuracy of the press:

Conclusion

Press power machine is the main equipment in stamping production process. With the rapid development of automotive industry, the demand for various high-quality equipment in automotive industry is also increasing. In the development of stamping process, there are three processes: manual line production, automatic intermittent production and automatic high-speed continuous production. Production equipment plays an important role in each update of modes.

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Classification of Power Press Power

Power press machine is a general term. And it includes punch, hydraulic press, with characteristics of versatility and high production efficiency. it makes metal have plastic deformation and fracture to process parts through exerting strong pressure to the metal blank. So I will take you to have a detailed understanding of the press.

Pneumatic power press machine

Pneumatic power press machine is composed of Pneumatic-hydraulic booster cylinder, worktable and control logic valve. It uses pneumatic and hydraulic power to press! Gas source of 3KG - 7KG can reach 1 ton to 100 tons of high pressure output!

Screw power press machine

Screw and nut are used as transmission mechanism in screw power press machine, and the forward and reverse rotary motion of flywheel is transformed into a forging and pressing machine with up and down reciprocating motion of slider by screw transmission. While working, the motor makes the flywheel rotate faster to save energy, and at the same time, the slider moves downward through the screw and nut. When the slider contacts the workpiece, the flywheel is forced to decelerate to a complete stop, and the stored rotational kinetic energy is transformed into impact energy, which strikes the workpiece through the slider and deforms it. After the blow, the motor reverses the flywheel and drives the slider up to its original position. The specification of screw press is showed by nominal working force.

Crank power press machine

Crank power press machine is one of the most commonly used cold stamping equipment, which is used as the working platform of cold stamping die. The utility model has the advantages of simple structure and convenient use. According to the structure of the bed, crank press can be divided into open crank press or closed crank press; according to the number of driving connecting rods, it can be divided into single point press or multi-point press; according to the number of sliders, it can be divided into single-action press or double-action press.

Multi-station power press machine

Multi-station power press machine is an advanced press equipment, which is the integration of multiple presses. It is generally composed of wire head unit, feeding mechanism, press and wire tail. The fastest rhythm can reach more than 40 times per minute, which can meet the needs of high-speed automatic production. Wire head unit can be divided into stacking unit, magnetic belt and cleaning, oiling equipment, etc. Feeding mechanism is generally composed of feeding arms; Press is generally divided into multiple sliders and single slider and choose according to different needs. The tail part is generally composed of conveying belt.

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Safety Operation Regulations for Power Press machine

1. Operators should be familiar with the structure and performance of the equipment and master the operation methods. 2. Before work, the equipment should be inspected. The equipment should be switched on and operated without any abnormalities. Then the equipment should be started to run empty for 3 minutes. Only when the motor runs at full speed without any abnormality can the clutch be combined to make the power press machine work. 3. According to the lubrication system diagram of the equipment, lubricating oil should be added regularly according to different parts.

4. Attention should be paid to the following points when installing the die of the power press machine: (1) The slider must be opened to the lower dead point and the closing height must be correct when installing the die. Avoid eccentric load as much as possible. When installing and debugging the die, measures such as cushion plate should be taken to prevent the upper die parts from falling and injuring hands. (2) Preliminary positioning of the die is tightened, and then the punch is moved close to the die. Then, while observing, the punch nut is twisted to align the die to ensure that the gap around the die is equal. (3) Tighten the die. After pointing and observing the alignment of the die, test the parts, and check whether the parts have flash phenomenon. If there is, make local adjustment. (4) The die must be reliable so as not to damage the die and punch. 

  5. when operating the power press machine, you should be focused and can not chat while working. 6. Every time you step on the foot switch, your foot should leave. You should not always put your foot on the foot switch to avoid accidental touching of the switch and causing accidents. 7. When feeding or receiving materials, it is strictly forbidden to extend hands or other parts of the body into dangerous areas. Auxiliary tools should be selected for processing small parts. When the die is stuck in the blank, only tools are allowed to be release and remove it. 8. It is absolutely forbidden to blank two sheets at the same time regardless of the size of the workpiece. 9. When the operator leaves his post, he must turn off the power supply in time and not make the equipment run when no one is there. 10. In the process of operation, attention should be paid to safety at all times. When the machine tool breaks down, it should stop immediately and ask the maintenance personnel to check and repair it. 11. After the work is finished, the die should be dropped and the power supply should be cut off. Clean up the debris and hygiene around the surface of the equipment in time to ensure a good working environment and personal safety.

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How to Get Rid of Common Faults of Servo Turret Power Press Machine?

Abstract: servo turret power press machine is an indispensable NC machine tool in sheet metal processing, and the equipment will inevitably fail. In this paper, by observing the shape and size of burr after plate processing, material stripping and overshoot of hole distance during processing, and other common faults, the fault points and causes of equipment are preliminarily judged. And combined with common alarm information, the troubleshooting methods are summarized.

Turret power press machine is one of the necessary means of sheet metal processing. In recent years, servo turret power press machine has basically replaced mechanical press and hydraulic press. Servo turret power press machine has many practical advantages, such as energy saving, high efficiency, environmental protection and machinability to form complex shapes. Understanding the common fault causes of servo turret power press machines is helpful to the maintenance of the equipment, and it can solve the problem quickly and avoid downtime for long.

1. The burr is too big after plate processing

Under this situation, whether the clearance between the upper die and the lower die is suitable should first be checked. Usually the clearance between the two sides of the upper die and the lower die is 20%-25% of the thickness of the plate. Sometimes this happens when the plate is not replaced in time for the corresponding clearance of the lower die. Another possibility is that the die is blunt, and the edges of the upper die and the lower die can be observed. If there are obvious rounded corners, it is necessary to grind the die or replace a new set of moulds. Generally, if the grinding depth of the lower die exceeds 0.5 mm, gaskets will be needed. The depth of grinding generally does not exceed 1 mm. If there are burrs on the half side of the sheet metal, it is suggested that there are deviation of the alignment of the upper and lower dies. At this time, it is generally necessary to contact the manufacturer after sales service to adjust the alignment with the special mandrel.

2. The knife which is cut through rotary die has burrs.

At present, the rotating die structure of turret power press machine on the market can be mainly divided into two kinds: one structure is typical characterized that the worm wheel and worm deceleration direct drive die base, which is installed in the follower of the docking fork, moves with the turntable; the typical feature of the other structure is that worm wheel and worm reducer is installed in the active side of the docking fork. Structurally speaking, the first kind of rotating die has higher precision.

The reason that there's burr in the cutting edge is that the angle of the cutting tool in the rotary die punching is not perpendicular to the feed. There are many possibilities for this phenomenon. According to the different structure of the rotary die, the inspection is different. The first type of rotating die structure needs to check whether the driving belt of the rotating die is too loose, whether the expansion sleeve of the pulley is loose, and whether the coupling connecting screw is loose. Besides the possible problem of the first type, the second type needs to check the concentricity of the connecting fork and the clearance between the sleeve and the fork.

3. pulling material

There are three main possibilities for pulling material. The direct consequence of pulling material may be scrap of sheet metal or even damage of equipment. (1) When the punch does not return to the upper dead point, the sheet metal moves. At this time, it is necessary to check whether the upper dead-point switch of the power head is normal and whether the system program has been changed. (2)stripping: Punch can not pull the sheet material out of the sheet metal, and the sheet metal moves. The stripping is due to insufficient unloading force. When the die goes up, the punch can not withdraw from the sheet metal, and the sheet metal goes up together. This kind of situation generally has the omen. When you discover that the sheet blanking has abnormal noise, it has the phenomenon of stripping, so you need to take the following measures promptly: ①use the bigger punch with additional inverted cone. ②Increase the upper die clearance. ③Check the strain degree of unloading spring and replace it when necessary. ④use die with sharp edge. ⑤Use heavy-duty die. ⑥Lubricate plate. ⑦adopy large workstations.

(3) Scrap rebound: The scrap is stuck between the sheet metal and the die, and the sheet metal moves. Waste rebound can be prevented and solved by the following measures: 1. Push rubber column should be installed on the end face of punch, and it should be replaced in time without missing. 2. Clean up the oil on the board. 3. Complete demagnetization of the die. 4. Reduce stamping frequency properly.5. Increase the modulus. 6. Use anti-rebound die. 7. Increase the gap between upper and lower dies.

4. Over-tolerance of hole spacing

First, observe which direction is out of tolerance, and check whether the expansion sleeve of the coupling and pulley of the lead screw is loose in the direction of out-of-tolerance; if the equipment is used for a long time, check the accuracy of the lead screw and the clearance between the die and the turntable; at the same time, check the set parameters, such as speed gain, speed loop integral gain, speed loop proportional gain, load inertia ratio and servo. Whether the gain of position loop meets the actual requirements or not, if not, the corresponding parameters need to be adjusted according to the waveform.

5. Solutions to Several Common Alarm Problems

(1) The switch signal is not in place, which may be the reason that the switch is loosening so that it is displaced; or the switch wiring has problems. Please check the line. (2) The piercing accuracy is not stable, and the servo axis of the machine tool is sometimes fast and sometimes slow in the course of operation. The reason for this phenomenon is that the parameters are not set correctly. It is necessary to check the settings of acceleration and deceleration and whether each gain meets the actual needs according to the waveform. (3) No alarm, no response to return to the origin. In general, the cause of this situation is that it is not in the position of the rotating die. Because when the machine tool returns to the reference point for the first time, it needs to move the rotating die shaft. If the rotating die shaft can not move, it will wait all the time.

6. conclusion

The above description is the fault and cause analysis which is common and generally exists. There are many small faults that need specific analysis.

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Mechanical Principle of Power Press Machine

The power press machine is driven by a motor through a transmission mechanism to exert technological force on the workpiece. The transmission mechanism is the deceleration mechanism of belt transmission and gear transmission, and the working mechanism is divided into screw mechanism, crank connecting rod mechanism and hydraulic cylinder.

Power press machines are divided into three categories: screw press, crank press and hydraulic press. Crank press is also called mechanical power press machine.

The screw power press machine has no fixed lower dead point. For larger die forgings, it can be formed by multiple strikes. It can be single, continuous beating and inch moving. The impact force is related to the deformation of the workpiece. When the deformation is large, the impact force is small, and when the deformation is small, such as cold shock, the impact force is large. In these respects, it is similar to forging hammer. But its impact force is closed through the frame, so it works smoothly, and its vibration is much smaller than that of the forging hammer, so it does not need a large foundation.

The lower part of the power press machine is equipped with a forging ejection device. The screw press has the functions of die forging hammer, mechanical press and other forging and pressing functions. It has strong versatility and can be used in die forging, blanking, drawing and other processes. In addition, the screw power press machine is widely used because of its simple structure and easy manufacture.

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Software System Design of Automatic Feeder for Power Press

PLC Main Program Design

PLC executes a procedure from beginning to the end. The program enters the image area from the input port. Each input port reads the port state from the memory, and then writes it into the device image area. The output port reads out the output state from the storage area, and then controls the external relays, component switches and so on, so as to control the whole feeding system.

System Control Flow

According to the actual work needs of the screw ring automatic feeder for power press, the whole process from feeding to discharging is the combination of automatic control and manual work. After the operator starts to install the installed lifting ring on the tooling, the bolt height is detected by the laser distance sensor. If the height reaches the preset parameter value, the equipment will alarm. After the feeder sends the screw ring to the designated position, the stamping bar will start. The displacement sensor detects the total length of the bolt and the thread retaining ring assembled at this time. If the length reaches the preset parameter value, the assembly process is completed and the workpiece is taken out.

Man-machine interface programming

Man-machine interface is offered for operators to observe the implementation of the program, such as the detection of bolt height and screw retainer pressure, the pneumatic circuit will carry out a series of actions. If the actual height value meets the preset parameter requirements, it can be adjusted by the control program button on the man-machine interface.

conclusion

Automatic feeder for power press plays an important role in actual production. With the advent of industrial 4.0, automated production slowly replaces manual operation, and improves production efficiency while improving production process, which greatly reduces the overall production time of enterprises. The peripherals controlled by PLC are easy to operate, which is beneficial for operators to learn and use. Flexible clamping is becoming more and more stable, which is more suitable for the needs of production diversity. The screw retaining ring down-pressure automatic feeder for power press studied in this paper meets the needs of the development of the times, and has a certain reference for future equipment upgrading.

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Hardware Selection of Automatic Feeder for Power Press System

LC and Module Selection

The hardware system of the automatic screw automatic feeder for power press uses Omron's CP1 PLC as the core controller. During the pressing process, the cylinder is used to drive the screw retaining ring. The laser distance sensor and displacement sensor are combined to control the screw retaining ring's pressure and the position accuracy of the bolt. Servo motor, as an important automation equipment to replace personnel operation, can achieve up to four-axis motor control by adjusting the built-in parameters. In terms of cost savings, the CP series is more in line with the actual work needs. It can achieve the positioning accuracy required by conveyor belt, assembly device, sensor, etc. It can also be used for high-speed counter, frequency conversion control functions. The CP series can greatly reduce the number of devices. In addition, the cost of the CP series is considerable and widely used. Under the CP series, CP1L includes CP1L-EM/EL with Ethernet port and can output 2-axis pulse.

Because the Socket communication function on board can carry on the signal transmission with the computer and other communication equipment equipped with the Ethernet equipment. Rich I/O units not only improve the overall performance of PLC, but also increase input and output units such as temperature sensors.

The function of PLC has been further expanded to make it more widely used [6].

Selection of Human-machine interface

Human Machine Interaction (HMI) is a human-machine interface produced by Zhongda Telecom Co., Ltd. Touch detection unit is installed in front of the display screen to detect the user's touch position and accept the backward touch screen controller. The main function of Delta touch screen controller is to receive touch information from the touch point detection device, to convert it into contact coordinates, and then send it to the CPU, which can also receive commands from the CPU and execute them.