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High-precision chemical fiber mold future development direction

Over the years, with the development of plastic-based steel, plastic-based wood and the increasing precision and complexity of product parts, the plastic mold industry has made great progress. Industry analysts pointed out that the plastic mold industry has entered the fast lane of development, and its development prospects are expected. It is true that the plastic mold industry is showing a vibrant scene. On the other hand, behind the fierce market competition, the competition of its technical processes is quietly carried out. It is reported that the plastic molded parts show its high precision, high complexity, high consistency, high productivity and low consumption. Its manufacturing method determines the quality, efficiency and development ability of the product to a large extent. Unique value and important role.

In fact, with the increasing size of China's plastic mold industry, the precision requirements of processing and manufacturing will be higher and higher, especially the ultra-precision processing is the key to the success of the enterprise. On the one hand, the miniaturization of parts and the improvement of precision requirements accelerate the company's desire for ultra-precision machining. On the other hand, the Plastic Injection Molded Automotive Parts development and maturity of related technologies have made the realization of ultra-precision machining possible. In this regard, relevant experts pointed out that the technical competition in the plastic mold industry, especially the technical competition of ultra-precision processing will undoubtedly influence the development and comprehensive competitiveness of the entire industry in the future.

From the current development of the entire industry, although some technical applications have emerged, the overall application and development areas are still relatively limited, and it is urgent to accelerate the pace of development. It can be seen that the plastic mold industry has entered a key node of technological competition, and all parties are taking precautions and actively responding. As the technological level of the plastic mold industry continues to rise, the entire industry will also show a stronger development momentum. For domestic plastic mold enterprises, how to accelerate the mastery of technical equipment, especially ultra-precision processing technology is undoubtedly the most critical task and subject.

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You need to strictly control the performance of the plastic mold.

What are the main requirements? The first is on the material produced. If you want the appearance and quality of the product to be better, you need to strictly control the performance of the plastic mold. At the time of production, engineers must first select materials strictly. Therefore, the problem of wear resistance of the mold should also be considered when making the mold.

At the same time, the material will continue to rub when it comes into contact with the mold, which requires a lot of friction. During the production process, the engineer will design the upper and lower temperature limits of the mold. Once the mold is put into production, it means that it needs to accept high temperature stimulation.What are the requirements for plastic mold making?

What are the requirements for plastic mold making? The production of our daily products requires the presence of molds.. For plastic products, Plastic mould manufacturers the production requires plastic molds. The mold can shape the shape and size of the product. Most of the plastic molds are made of synthetic resin as the main material. The formation of the shape of the product requires a high temperature for smelting. Engineers design rigorous production requirements when producing such molds

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It has reached or is close to the international level

China's die-casting industry has developed rapidly since the 1990s and has become an emerging industry. At present, the most widely used process in aluminum alloy forming processes for automobiles is aluminum alloy die casting, which accounts for 49% of various automotive molding processes. There are about 3,000 die-casting enterprises in China, and the output of die-casting parts has increased from 266,000 tons in 1995 to 870,000 tons in 2005. The annual growth rate has remained above 20%, of which aluminum alloy die-casting parts account for 3/ of all die-casting parts. 4 or more. The types of die-casting products in China are diversified, including automobiles, motorcycles, telecommunications, home appliances, hardware products, power tools, IT, lighting, escalator steps, and toy lights. With the improvement of technology level and product development capability, the types and application fields of die-casting products have been continuously expanded, and the die-casting equipment, die-casting molds and die-casting processes have undergone tremendous changes.

Die-casting technology Since the commercialization of aluminum alloy in 1914, with the development of the automotive industry and the invention of the cold chamber die-casting machine, it has developed rapidly. Die-cast aluminum alloys are classified into medium and low strength (such as China's Y102) and high strength (such as China's Y112). At present, die-casting aluminum alloys for industrial applications mainly include the following series: Al-Si, Al-Mg, Al-Si-Cu, Al-Si-Mg, Al-Si-Cu-Mg, Al-Zn, and the like. The improvement of the mechanical properties of die-casting aluminum alloys is often accompanied by the decrease of the casting process performance. The pressure casting is characterized by its high-pressure rapid solidification, which makes this contradiction more prominent in some aspects. Therefore, it is difficult for the die-casting parts to be subjected to solution heat treatment, which restricts the The improvement of mechanical properties of die-casting aluminum alloys, although oxygen-filled die-casting and vacuum die-casting are effective ways to improve the mechanical properties of the alloys, but it is still difficult to use them widely, so the development of new die-casting aluminum alloys has been ongoing. The development of die-casting equipment has been improved in recent Plastic mould factory years.

The design level, technical parameters, performance indexes, mechanical structure and manufacturing quality of China's die-casting machines have been improved to varying degrees, especially in cold chamber die-casting machines. The type of mechanism is changed to a curved elbow type matching mechanism. At the same time, automatic loading, automatic spraying, automatic picking, automatic cutting, etc. are added. The electric appliance is also changed from ordinary power control to computer control, and the control level is greatly improved. It has reached or is close to the international level and is marching toward large-scale, automation and unitization. At present, China's domestic mold market satisfaction rate is only about 80%, including medium and low-grade molds, large and complex precision molds, in terms of production technology, mold quality and life and production capacity can not meet the national economic development. need. Research and development direction The consumption of automotive and motorcycle industries and automotive accessories and the demand for ancillary products provide a broad market for the production of die-casting parts, and the application of die-cast aluminum alloys in automobiles will continue to expand. In the future research and development of die-casting technology, the deepening of aluminum alloy die-casting will still be a major direction in the development of die-casting technology. In order to meet the market demand, the following problems should be further solved in the future: (1) Promote the application of new high-strength, high-abrasion die-casting alloys, research on tintable die-casting alloys, and new die-casting for castings with special safety requirements. (2) Development of die-casting aluminum alloy with stable performance and easy control of composition; (3) simplifying alloy composition, reducing alloy grade, providing basis for green production; (4) further improving new die casting process (vacuum die casting, oxygenation) Die casting, semi-solid die casting, extrusion casting, etc.; (5) Improve the ability to respond quickly to the market, promote parallel engineering (CE) and rapid prototyping technology (RPM); (6) carry out research on CAD/CAM/CAE system And development; (7) development and application of more die-cast aluminum alloy automotive parts.

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The process of polishing the mold polishing technology

When the polishing process is stopped, all abrasives and lubricants should be carefully removed to ensure that the surface of the workpiece is clean, and then a layer of mold anti-rust coating should be sprayed on the surface of the workpiece. For more precise polishing, it must be in an absolutely clean space, as dust, smoke, dandruff and water droplets can scrap high-precision polished surfaces. The order of use is 180Plastic Injection Molded Automotive Parts→240#→320#→400#→600#→800#→1000#. A polishing process with an accuracy requirement of 1 μm or more (including 1 μm) can be performed in a clean polishing chamber. In fact, #1500 sandpaper only uses mold steel suitable for hardening (above 52HRC), and is not suitable for pre-hardened steel, because it may cause damage to the surface of pre-hardened steel and cannot achieve the desired polishing effect.

Third, fine polishing: fine polishing mainly uses diamond abrasive paste. The number of sandpaper is: 400#→600#→800#→1000#→1200#→1500#. Then, polishing was carried out with a felt felt and a diamond abrasive paste in the order of 1 μm (14000#) → 1/2 μm (60000#) → 1/4 μm (100000#). Second, semi-fine polishing: semi-fine polishing mainly uses sandpaper and kerosene.. After the polishing process is completed, the surface of the workpiece should be protected from dust. Generally, after rough polishing with oil stone to 1200# sandpaper, the workpiece needs to be polished to clean without dust, ensuring that no dust particles in the air adhere to the mold surface. First, rough throwing:

Finished milling, EDM, grinding and other processes can be polished on a rotating surface finisher with a speed of 35,000 to 40,000 r/min. Then there is a manual oil stone grinding, strip of oil stone plus kerosene as a lubricant or coolant. Fourth, # the polishing working environment: the polishing process should be completed separately at two working places, that is, the rough grinding processing location and the fine polishing processing location are separated, and attention should be paid to cleaning the sand grains remaining on the surface of the workpiece in the previous process. The 9μm diamond paste and polishing cloth wheel can be used to remove the hair marks left by the 1200# and 1500# sandpaper. If the polishing powder is mixed with a diamond abrasive powder or a polishing paste, the usual polishing order is 9 μm (1800#) → 6 μm (3000#) → 3 μm (8000#).Mold polishing technology polishing process

The process of polishing the mold polishing technology The last article briefly introduced the mold polishing technology, and then asked everyone to introduce the process

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The structural dimensions of plastic parts are unstable, mainly affected by molds

 Defect characteristics The main performance of the dimensional instability of plastic parts is that the ability of plastic parts to maintain accurate shape during molding is poor and the size is unstable. (2) Causes of defects and their elimination methods The structural dimensions of plastic parts are unstable, mainly affected by molds, injection molding processes, equipment, raw materials, etc. The specific analysis is as follows. 1) The rigidity of the mold of the injection mold 1 is not enough. After the force is applied, the mold is deformed and the cavity is deformed, which makes the dimensions of the plastic part unstable.

Therefore, the rigidity of the mold should be enhanced. 2 If the guiding precision of the mold is not good, the positioning is not accurate enough, resulting in dimensional instability. For this, the guiding precision of the guiding component should be checked and the matching clearance should be within the permissible range. Due to the soft material or excessive use of the 3 cavity, the wear is serious, the cavity size is seriously deviated from the requirements, and the obtained plastic parts are bound to be out of tolerance. For this, the precision must be repaired, restored, or replaced. 4 The design and manufacturing precision of the mold are low, and it is difficult to meet the requirements with the plastic parts processed. Therefore, the design and manufacturing precision of the mold should be improved. 5 For plastic China injection molding suppliers parts with more precise wall thickness requirements, it is difficult to ensure the accuracy of the positioning of the guide post and the guide bushing. The size of the obtained plastic parts is difficult to be accurate. For this, other auxiliary positioning devices must be added. 6 For multi-cavity molds, it is difficult to achieve complete consistency due to machining errors between the various cavities. Thus, the dimensions of the resulting plastic parts are difficult to be the same. If the plastic parts in each cavity are to meet the requirements, they must be strictly controlled.

The machining accuracy is such that the dimensional accuracy dimensions are within the permissible range. 7 The thickness error caused by the wall thickness of the molded part of one cavity and one cavity is generally caused by the relative displacement of the cavity and the core due to the installation error of the mold and the poor positioning. For this, it is necessary to strengthen the guiding and positioning. The device is positioned so that it can be accurately positioned. 8 Because plastic shrinks during the molding process, and the shrinkage rate of each plastic is different, it is important to consider the impact of plastic shrinkage on the size of the plastic part in the mold design. Larger. 9 When making the mold, in order to facilitate the trimming of the mold, the cavity is always made smaller than the required size, and the core is made larger than the required size, leaving a certain amount of mold repair. 2) Injection molding process 1 If the melt filling time and the holding time are short, the melt cannot be uniformly distributed evenly in the cavity, so that the density is different everywhere, resulting in dimensional instability. Therefore, the filling time should be appropriately extended. compress time. 2 If the mold temperature is too low, the flow rate of the melt in the cavity changes greatly, and the temperature drop rate is also different, which makes the size of the molded plastic part unstable. Therefore, the mold temperature should be controlled within a suitable range. 3 If the injection pressure is too small, the injection speed is low, so that the flow of the melt during the filling process is not stable enough, resulting in dimensional instability, and the injection pressure should be appropriately increased. 4 molding operating conditions also have a certain impact on the size of the plastic parts, such as increasing the injection pressure, increasing the melt temperature, reducing the mold temperature, increasing the cross-sectional area of ​​the gate and filling time, can reduce the shrinkage of the plastic parts. Therefore, the molding parameters can be changed to change the size of the plastic part, but the dimensional change is small. 3) Injection molding equipment 1 If the feeding system of the injection molding machine is unstable, the supply of the melt is also unstable, and the corresponding plastic parts are also unstable. For this, the feeding system should be overhauled to make it work normally. 2 If the heating system at the barrel and nozzle is not working properly, the melt temperature fluctuates greatly, which will result in unstable plastic parts. For this, the heating system at the barrel and nozzle should be repaired to make it work normally. 3 If the rotation speed of the injection screw is unstable, the stopping action is abnormal, and the injection volume of the injection molding machine fluctuates greatly, which makes the size of the plastic part unstable. For this, the transmission system should be inspected to make it work normally. 4 If the plasticizing capacity of the injection molding machine is insufficient, the capacity at the time of injection is insufficient, resulting in an unstable plastic part. For this, the plasticizing capacity should be adjusted or replaced with a large-capacity injection molding machine.

If the temperature control system of the injection molding machine fails, the temperature control is abnormal, and the melt temperature is unstable, so the size of the obtained plastic parts is unstable, and this should be carefully checked and eliminated. 4) If the raw material particle size is not uniform, the powder material is too large, and the material having too large difference in particle size is difficult to be uniformly plasticized, and the resulting plastic part is unstable in size, and the raw material particles are required to be substantially uniform, such as Powdered material is sieved for screening. 2 If there is too much recycled material mixed in the raw material, the addition of the recycled material makes the plasticizing uniform more difficult, so the size of the plastic part is unstable, and the amount of the recycled material should be controlled. 3 Many raw materials, although the same brand (such as resin), due to different origins and manufacturers, their performance is not the same, resulting in the dimensional instability of the plastic parts, in order to adapt to the formula. 4 The shrinkage rate of the crystalline resin is larger than that of the amorphous resin and the range of shrinkage varies. The different properties of these resins have a great influence on the dimensional stability of the molded parts. Therefore, it is necessary to understand the various properties of various resins. .

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Development trend of die casting production enterprises

At present, China's automobile industry is in a period of rapid growth, and the scale effect begins to appear. The relationship between the die-casting industry and the automotive industry is mainly concentrated on the production of cars. This structural change in China's auto industry has given the die-casting industry a broader space for development. At the same time, in some industrially developed countries, the industrial structure of die-casting production has undergone fundamental changes. Some die-casting enterprises have experienced joint, merger, reorganization, and even some closures. At the same time, some enterprises have shifted their die-casting production overseas and set up factories. . According to foreign media reports, some international giants in the automotive industry have clearly stated that they intend to purchase auto parts, components and complete vehicles from China.

The domestic media also has relevant reports, mentioning that overseas buyers must purchase auto parts from China, ranging from hundreds of millions to billions of dollars. This global move will inevitably provide greater market space for the die casting industry. According to statistics, the supply of aluminum alloy wheels in China accounts for about 40% of the US market. The production and export of automotive aluminum alloy wheels at the end of China's “Eleventh Five-Year Plan” are accelerating. It is worth mentioning that in the fierce market competition, the work of ISO9000, QS9000, ISO/TS16949 and ISO14000 in the international certification of die-casting enterprises is not only very important, but also an important symbol for the upgrading of China's die-casting enterprises in management and further integration with the international market. . In general, it is difficult to get a good order without obtaining the necessary certification. The die-casting industry is mainly constrained by rising raw materials, the industry is fiercely competitive, and the development space is limited.

Although the demand for various die-casting parts is on the rise, the rising pressure of raw material prices cannot be completely digested, and will eventually lead to the reshuffle of die-casting parts manufacturers. At present, companies are improving their operations by reducing scrap rates, strengthening management (including quality management, eliminating waste, etc.), improving efficiency, integrating processes, and developing new products. It is expected that the development trend of die-casting parts manufacturing enterprises will be as follows: 1. Introduce capital, technology, management, market and information of foreign die-casting enterprises, and build more new forms of die-casting enterprise groups such as foreign capital, joint ventures, joint ventures and joint stocks. Second, the trend of mergers and alliances has risen. There are joint ventures between end-product enterprises and component companies, joint ventures with related processes, and joint ventures with suppliers. They have or combine, merge, or attach. form. Third, the die-casting factory is more professional, and the scale is gradually increased. Some also increase the subsequent processing of the die-casting parts until the finished parts are delivered to the user. Fourth, the production of conditional parts (such as parts and components of automobiles) enterprises set up or merge die-casting parts factories to achieve a virtuous cycle and optimized management mode for self-supply of die-cast parts in enterprises. In the next few years, the competition in the die-casting machine industry will become more intense.

More and more die-casting machine enterprises have insufficient confidence in the industry, and the phenomenon of production suspension and production has increased. Large-scale manufacturers may eventually overcome difficulties through strength, while small manufacturers will replace old and new. The following competition situation will occur: First, the powerful enterprises in the relevant industries will gradually develop into a situation of competition and cooperation. Second, enterprises with large scale and strong strength are becoming more and more powerful. Companies with small scale and small strength are forced to change production due to fierce competition, or they are killed by merger. Third, new technologies are constantly emerging, and companies with new technologies and strong backgrounds will enter the die casting machine production Plastic mould factory industry and will grow stronger. Fourth, the peripheral equipment, peripheral equipment, complete sets of facilities and other supporting industrial categories of the die-casting industry are expanding and becoming more and more complete.

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The benefits of using hot runners in injection molds

Hot runner molds are widely used in various industrialized countries and regions in the world today. This is mainly because the hot runner mold has the following remarkable features: 1. Shorten the molding cycle of the part and improve the production efficiency: Since there is small household appliances OEM no limitation of the cooling time of the main flow channel and the secondary flow channel, the workpiece can be ejected in time after being solidified. Many thin-walled product molding cycles produced with hot runner molds can be completed in less than 8 seconds. 2, saving plastic raw materials traditional mold injection will produce nozzle material, high plastic products are not allowed to use water (recycled secondary material), because the reuse of nozzle material will degrade the structure and performance of plastic parts, reuse will affect product quality. 

Since there is no cold runner in the hot runner mold, no nozzle material is produced (fees are required). This is especially significant for applications where the price of plastics is expensive. In fact, the major hot runner manufacturers in the world have experienced rapid development in the world when oil and plastic raw materials are expensive, because hot runner technology is reducing materials and reducing materials. 

Fees, an effective way to save costs. 3, reduce defective products, improve product quality In the hot runner mold molding process, the plastic melt temperature is accurately controlled in the flow channel system. The plastic can flow into the cavities in a more uniform state, resulting in a consistent quality plastic part. The hot runner molding plastic parts have good quality, low residual stress after demolding, small deformation of plastic parts, and greatly improved surface appearance of injection molded products. Therefore, many high quality products on the market are produced by hot runner molds. As people are familiar with

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In the injection molding of the moving mold and the determination of the mold closed

Many friends may not know that in our production, the injection mold is usually composed of three parts, the injection molding system/injection system, the core and cavity of the mold, and the ejection mechanism. In the injection molding of the moving mold and the determination of the mold closed casting system and the cavity, the mold moving mold and the fixed mold are separated to remove the plastic product.

The following injection mold manufacturers will talk to you in depth! 1. The plastic system is the time when the nozzle and the flow channel enter the mold cavity, including the runner and the gate. 2. The cavity and core are the most important parts of the mold. Plastics are made into plastic cores and cavities to form plastic parts. The quality of the products is basically here. The problem is basically the same two places. 3. Eject the mechanism. After the mold is molded, the plastic parts are basically left on the core. At this time, the ejection mechanism is required to eject the plastic parts.

The ejection mechanism is usually a thimble, a top plate or a top block. Injection mold manufacturers have many years of history. Main business, plastic molds, injection molds, plastic molds and other Plastic mould factory professional processing custom production. Providing services for the mold industry products, immersing the mold industry for many years, doing things with heart and mind, and working hard for the dream. Need to know more relevant knowledge can continue to pay attention to our official website!