Car precision plastic molding mold design elements – Video Encoder/Decoder – EOP
Most cars use plastic injection molding parts, plastic parts as they design their own high precision plastic parts can not make use of these conventional injection molding, and must be precision injection molding technology. To ensure the precision plastic parts car performance, quality and reliability, a high quality injection molding, product design meet the requirements of the plastic products, must be plastic materials, injection molding equipment and molds and injection molding processes are continuously improved.
Precision injection molding of the main factors affecting
Determined based on precision injection molding precision injection molding products, products that tolerance, geometric tolerance and surface roughness. To be precise injection must be made to the relevant conditions, the most essential is the plastic material, injection mold, injection molding equipment, processes and these four basic factors. When designing plastic products, plastic materials should be selected first, and can carry out precision injection molding of engineering plastics must also use those high mechanical properties, dimensional stability, creep resistance and good resistance to environmental stress cracking of the material. Second, the choice should be based on plastic materials, finished size precision, pieces of weight, quality requirements and expected use of mold for injection molding machine. In the process, the impact of precision injection molding products mainly come from precision molds, injection molding shrinkage, and the product range of ambient temperature and humidity and so on.
In precision injection molding, the mold is made to meet the quality requirements of precision plastic products, one of the keys, precision plastic injection molds used to be real consistent product size, accuracy and shape requirements. But even if the precision mold, same size, the molding of plastic products will be the actual size differences due to inconsistent shrinkage. Therefore, effective control of plastic shrinkage in precision injection molding technology is very important.
Mold design a reasonable will directly influence the plastic shrinkage, due to the mold cavity size is plastic with the estimated size of the contraction rate to get, but shrinkage is made of plastic or plastic manufacturers recommend manual a range of values, it is not only the form with the mold gate, gate location and distribution, but also to the crystalline orientation of engineering plastics.
Plastic shape, size, distance and location to the gate. The main effect of plastic shrinkage are shrinking, contraction phase transition, orientation contraction, shrinkage and elastic recovery, compression and other factors, which influence factors and precision injection molding products, conditions or operating conditions. Therefore, the mold must be considered in the design of those factors and the relationship between injection condition and the apparent factors, such as injection pressure and cavity pressure and filling speed, injection melt temperature and mold temperature, mold structure and the form and distribution of gate and gate cross-sectional area, wall thickness products, plastic materials enhance the content of filler, plastic materials, crystallinity and orientation and other factors. The impact of these factors because of different plastic materials, other molding conditions such as temperature, humidity, to crystallization, the internal stress after molding, injection molding machine of different changes.
As the plastic injection molding process from the solid powder or granular solid to liquid products melt Youxiang process of change. From the pellet to melt, then melt into products, the middle to go through a temperature field, stress field, flow field and density field such as the role of interaction in these fields, the different plastic thermosetting or thermoplastic, crystalline or non-crystalline, such as enhanced or enhanced with different morphology and rheological properties of polymers. All the factors affecting the market is bound to affect the physical and mechanical properties of plastic products, size, shape, precision and visual quality. In this way, technology factors and the performance of polymers, structure and morphology and the intrinsic link between the plastic products will be demonstrated through the plastic. Analysis of these clearly intrinsically linked to the development of the injection molding process is reasonably and rationally designed according to drawings manufacture of molds, injection molding processing equipment and even a reasonable choice of great significance. Precision injection molding and general injection pressure and injection rate in the also have different, often using high-pressure injection molding precision injection or high pressure, high-speed injection molding to obtain a smaller shrinkage. All the above reasons, the design of precision plastic injection molds die other than by considering the general design elements, they also need to consider the following points: ① appropriate mold tolerance; ② preventing mold shrinkage error; ③ prevent deformation of injection; ④ prevent stripping deformation; ⑤ to minimize mold manufacturing error; ⑥ prevent mold precision error; ⑦ maintaining precision molds.
Most cars use plastic injection molding parts, plastic parts as they design their own high precision plastic parts can not make use of these conventional injection molding, precision injection molding and must use technology. To ensure the precision plastic parts car performance, quality and reliability, a high quality injection molding, product design meet the requirements of the plastic products, must be plastic materials, injection molding equipment and molds and injection molding processes are continuously improved.
Precision injection molding of the main factors affecting
Determined based on precision injection molding precision injection molding products, products that tolerance, geometric tolerance and surface roughness. To be precise injection must be made to the relevant conditions, the most essential is the plastic material, injection mold, injection molding equipment, processes and these four basic factors. When designing plastic products, plastic materials should be selected first, and can carry out precision injection molding of plastic and it must select those with high mechanical properties, dimensional stability, creep resistance and good resistance to environmental stress cracking of the material. Secondly, in accordance with the selected plastic materials, finished size precision, pieces of weight, quality requirements and expected use of mold for injection molding machine. In the process, the factors that affect the precision injection molding products, mainly from the precision mold, injection molding shrinkage, and the product range of ambient temperature and humidity and so on.
In precision injection molding, the mold is made to meet the quality requirements of precision plastic products, one of the keys, precision plastic injection molds used to be real consistent product size, accuracy and shape requirements. But even if the precision mold, same size, the molding of plastic products will be the actual size differences due to inconsistent shrinkage. Therefore, effective control of plastic shrinkage in precision injection molding technology is very important.
Mold design a reasonable will directly influence the plastic shrinkage, due to the mold cavity size is plastic with the estimated size of the contraction rate to get, but shrinkage is made of plastic or plastic manufacturers recommend manual a range of values, it is not only the form with the mold gate, gate location and distribution, but also to the crystalline orientation of engineering plastics.
Plastic shape, size, distance and location to the gate. The main effect of plastic shrinkage are shrinking, contraction phase transition, orientation contraction, shrinkage and elastic recovery, compression and other factors, which influence factors and precision injection molding products, conditions or operating conditions. Therefore, the mold must be considered in the design of those factors and the relationship between injection condition and the apparent factors, such as injection pressure and cavity pressure and filling speed, injection melt temperature and mold temperature, mold structure and the form and distribution of gate and gate cross-sectional area, wall thickness products, plastic materials enhance the content of filler, plastic materials, crystallinity and orientation and other factors. The impact of these factors because of different plastic materials, other molding conditions such as temperature, humidity, to crystallization, the internal stress after molding, injection molding machine of different changes.
As the plastic injection molding process from the solid powder or granular solid to liquid products melt Youxiang process of change. From the pellet to melt, then melt into products, the middle to go through a temperature field, stress field, flow field and density field such as the role of interaction in these fields, the different plastic thermosetting or thermoplastic, crystalline or non-crystalline, such as enhanced or enhanced with different morphology and rheological properties of polymers. All the factors affecting the market will affect the physical and mechanical properties of plastic products, size, shape, precision and visual quality. In this way, technology factors and the performance of polymers, structure morphology and the intrinsic link between the plastic products will be demonstrated through the plastic. Analysis of these clearly intrinsically linked to the development of injection molding processing reasonably and rationally designed in accordance with the drawings making mold, injection molding processing equipment and even a reasonable choice of great significance. Precision injection molding and general injection pressure and injection rate in the also have different, often using high-pressure injection molding precision injection or high pressure, high-speed injection molding to obtain a smaller shrinkage. All the above reasons, the design of precision plastic injection molds die other than by considering the general design elements, they also need to consider the following points: ① appropriate mold tolerance; ② preventing mold shrinkage error; ③ prevent molding deformation; ④ prevent stripping deformation; ⑤ to minimize mold manufacturing error; ⑥ prevent mold precision error; ⑦ maintaining precision molds.
Preventing mold shrinkage error
As the shrinkage rate of change due to injection pressure, therefore, a single cavity mold, the cavity of the mold cavity pressure should be consistent; For more cavity mold cavity between the cavity pressure to be the difference is small. Multi-gate single cavity or multi-cavity multi-gate case, the same injection pressure must be injected, so that the same cavity pressure. To this end, we must ensure that the location of the gate balance. In order to make the cavity of the mold cavity pressure line, it is best to make the pressure at the entrance gate line. The gate to the balance of pressure and flow in the flow resistance. Therefore, the pressure to reach balance in the gate before you make a balanced circulation. As the melt temperature and mold temperature on shrinkage rate of the actual impact, and therefore in the design of precision plastic injection mold cavity, in order to facilitate the identification of molding conditions, should be noted that the arrangement of the cavity.
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