Shanghai Daoqin Plastics Co., Ltd.

判定 precision injection molding parts based on is injection molding parts products degree, products dimensions 公差, 形位公差 and surface coarse degree. need 进行 precision injection molding parts must has many related conditions, most essence is plastics material, injection molding parts mold, injection molding parts process and injection molding parts equipment this basic factors. design plastics products 时, 应首先选定 engineering plastics material, can precision injection molding parts engineering plastics also must selection that force property can high, dimensions stability, resistant creep property can good, resistant ring force cracking material. its according to selection plastics material, formed product dimensions degree, parts heavy, quality requirements and mold structure selection suitable injection molding parts machine. in processing process in, effect/influence precision injection molding parts products factors main/primary mold degree, injection molding parts shrinkage, and products ring temperature degree and wet degree 变化幅 degree and other 方面. 　　 in precision injection molding parts in, mold is use 以取 符 combined quality requirements precision plastics products key/critical 之一, precision injection molding parts use mold 应切实符 combined products dimensions, degree and requirements. make mold degree, dimensions 一致, its plastics products 之实际 dimensions 也会因 shrinkage amount 差异而不一致. therefore, has control plastics products shrinkage rate in precision injection molding parts technology in 就显 十 separation important. 　　 mold design combined and 否会直接 effect/influence plastics products shrinkage rate, due to mold type dimensions is plastics products dimensions add upper shrinkage rate 求, shrinkage rate is plastics production or engineering plastics manual/handbook recommendation scope/range inner value, it not only and mold gate 形式, gate and distribution has 关, but also and engineering plastics crystallization orientation property (各 toward property), plastics products 形状, dimensions, to gate and has 关. effect/influence plastics shrinkage rate main/primary has hot shrinkage, versus shrinkage, orientation shrinkage, pressure shrink shrinkage and elastic property and other factors, this effect/influence factors and precision injection molding parts products molding conditions or as conditions has 关. therefore, in design mold must this effect/influence factors and injection molding parts conditions and its table/sheet factors, injection molding parts pressure and mold cavity pressure and speed degree, injection melt temperature degree and mold temperature degree, mold structure and gate and distribution, and gate 截面积, products thick, plastics material in reinforcement filler content, plastics material crystallization degree and orientation property and other factors effect/influence. upper factors effect/influence plastics material different, its it molding conditions temperature degree, wet degree, crystallization 化, molding rear internal stress, injection molding parts machine 变化而 different. 　　 due to injection molding parts process is plastics from solid 态(powder material or material) toward liquid 态(melt) also toward solid 态(products)转变 process. from material to melt, again melt to products, in need temperature degree 场, force 场, 流场以 and density and other function, in this 场 共同 function lower, different plastics (hot solid property or thermoplastic property, crystallization property or non crystallization property, reinforcement type or non reinforcement type and other) tool has different polymer structure and property can. is effect/influence to upper 述"场" factors will effect/influence to plastics products material force property can, dimensions, 形状, degree and appearance quality. 　　 this 样, process factors and polymer property can, structure and plastics products between inner in 联系会 through plastics products performance 出. analysis this inner in 联系, for combined 理 拟定 injection molding parts processing process, combined design 并按图纸 manufacturing mold, combined selection injection molding parts processing equipment has important 意义. precision injection molding parts and injection molding parts in injection molding parts pressure and injection speed rate upper has difference, precision injection molding parts using/adopting high pressure or ultra-high pressure injection, high speed injection obtain relatively small molding shrinkage. comprehensive upper various causes, design precision injection molding parts mold remove generally mold design elements outer, also must below/following 几点: ① using/adopting mold dimensions 公差; ② anti generate molding shrinkage 误差; ③ anti 止发生 injection molding parts deformation; ④ anti 止发生 demolding deformation; ⑤ make mold manufacturing drop most small; ⑥ anti mold degree 误差; ⑦ maintain mold degree.