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Molding process of plastic parts
by：CSSSLD
2021-02-03
Accuracy according to requirements of the injection molding processing to determine, generally with parts dimensional accuracy is higher than the cooperate with dimension precision, being affected by the fluctuation of the plastic shrinkage rate, small size is easy to achieve high precision.
The higher the accuracy requirement of the plastic, the higher the manufacturing precision of the mould, the mould manufacturing difficulty and the cost is higher, at the same time, the rejection rate of plastic parts will increase.
Therefore, in the plastics materials and process conditions of certain circumstances, should be reasonable selection of precision grade.
the appropriate moisture and volatile matter content in plastic plasticizing effect, is beneficial to molding, to improve mold filling liquid. For example, in the bakelite powder usually require moisture and volatile matter content is 1. 3%, if too much, it could prompt liquidity is too large, lead to growth, molding cycle parts shrinkage rate increases, prone to buckling, deformation, cracks and surface roughness etc. Phenomenon, at the same time, the performance of the plastic parts, especially the electric insulation performance will be reduced.
the dimension precision of plastic parts is gained by the size of the plastic product size and the picture in line with the degree, the plastic parts dimension accuracy, available plastics allowed size tolerance. There are many factors affected the accuracy of parts size, the first is the manufacturing precision of mould and mould wear and tear degree, followed by the fluctuations of plastic shrinkage rate, and the molding process conditions change, aging changes after the plastic molding and mold structure shape and so on. Therefore, the size of the plastic parts precision is not high, should be on the premise of guarantee the use requirement as far as possible choose low precision grade.
hardening rate is also known as the curing speed. It refers to thermosetting plastic in the suppression of standard specimen, within the mold into a hard without melting, the speed of the insoluble state. Usually in hardening 1 mm thick sample time. Each kind of thermosetting plastics has certain hardening speed. Hardening rate is too low, can make the plastic parts molding cycle extended, hardening rate is too high, not easy to shape complex plastic forming parts.
hardening speed and performance of the plastic used, the choice of preloading, molding temperature and pressure, adopting preheating, preloading, improve the forming temperature and pressure, is helpful to improve the hardening speed. Thermosetting plastic molding process performance and granularity, specific volume and tablet. Molding process condition is different, have different performance requirements of the technology of plastic, also refer to the relevant data and determine by selecting specific molding requirements.
the mold cavity surface is smooth, cavity shape is simple, the mold structure is advantageous to the cavity pressure injection molding processing, when forming proper preheating, preloading, choosing the appropriate mould temperature, etc. , to improve the liquidity of thermosetting plastics. Moisture and volatile matter content of a plastic mainly from two aspects: one is from the thermosetting plastic wasn't clean water or stored in the manufacturing process due to improper packing and absorption of moisture. The second is from plastic molding chemical reaction byproducts.
the size of the plastic parts, precision and surface roughness are generally according to the requirement to determine, but must also give full consideration to the performance of the plastic and molding process characteristics. Plastic pieces of the size of the size is associated with the liquidity of plastic, in injection molding and transfer molding, illiquid plastics and thin wall plastic parts such as the size of the design cannot be too large. Large, thin plastic parts already cured when plastic is not full of cavity, or force fills, but plastic forward fused to form a cold joint, the most important affect the structure appearance and strength. Injection molding plastic parts size and injection volume of injection molding machine, clamping force and restrictions on the size of template, compression and injection molding of plastics by maximum pressure and press press working mesa size restrictions on the size of the largest.
more wonderful articles, plastic molding process performance, click directly.
http://www。 csssld。 cn//html/2017/Info_0625/614。 HTML
nantong on suye's official website: http://www. csssld。 Cn / /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
the appropriate moisture and volatile matter content in plastic plasticizing effect, is beneficial to molding, to improve mold filling liquid. For example, in the bakelite powder usually require moisture and volatile matter content is 1. 3%, if too much, it could prompt liquidity is too large, lead to growth, molding cycle parts shrinkage rate increases, prone to buckling, deformation, cracks and surface roughness etc. Phenomenon, at the same time, the performance of the plastic parts, especially the electric insulation performance will be reduced.
the dimension precision of plastic parts is gained by the size of the plastic product size and the picture in line with the degree, the plastic parts dimension accuracy, available plastics allowed size tolerance. There are many factors affected the accuracy of parts size, the first is the manufacturing precision of mould and mould wear and tear degree, followed by the fluctuations of plastic shrinkage rate, and the molding process conditions change, aging changes after the plastic molding and mold structure shape and so on. Therefore, the size of the plastic parts precision is not high, should be on the premise of guarantee the use requirement as far as possible choose low precision grade.
hardening rate is also known as the curing speed. It refers to thermosetting plastic in the suppression of standard specimen, within the mold into a hard without melting, the speed of the insoluble state. Usually in hardening 1 mm thick sample time. Each kind of thermosetting plastics has certain hardening speed. Hardening rate is too low, can make the plastic parts molding cycle extended, hardening rate is too high, not easy to shape complex plastic forming parts.
hardening speed and performance of the plastic used, the choice of preloading, molding temperature and pressure, adopting preheating, preloading, improve the forming temperature and pressure, is helpful to improve the hardening speed. Thermosetting plastic molding process performance and granularity, specific volume and tablet. Molding process condition is different, have different performance requirements of the technology of plastic, also refer to the relevant data and determine by selecting specific molding requirements.
the mold cavity surface is smooth, cavity shape is simple, the mold structure is advantageous to the cavity pressure injection molding processing, when forming proper preheating, preloading, choosing the appropriate mould temperature, etc. , to improve the liquidity of thermosetting plastics. Moisture and volatile matter content of a plastic mainly from two aspects: one is from the thermosetting plastic wasn't clean water or stored in the manufacturing process due to improper packing and absorption of moisture. The second is from plastic molding chemical reaction byproducts.
the size of the plastic parts, precision and surface roughness are generally according to the requirement to determine, but must also give full consideration to the performance of the plastic and molding process characteristics. Plastic pieces of the size of the size is associated with the liquidity of plastic, in injection molding and transfer molding, illiquid plastics and thin wall plastic parts such as the size of the design cannot be too large. Large, thin plastic parts already cured when plastic is not full of cavity, or force fills, but plastic forward fused to form a cold joint, the most important affect the structure appearance and strength. Injection molding plastic parts size and injection volume of injection molding machine, clamping force and restrictions on the size of template, compression and injection molding of plastics by maximum pressure and press press working mesa size restrictions on the size of the largest.
more wonderful articles, plastic molding process performance, click directly.
http://www。 csssld。 cn//html/2017/Info_0625/614。 HTML
nantong on suye's official website: http://www. csssld。 Cn / /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
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