Shanghai Daoqin Plastics Co., Ltd.

plastics electronics parts large using/adopting injection molding, due to this plastics parts tool has relatively high design degree, use engineering plastics processing, for this plastics parts can using/adopting injection molding, must using/adopting precision injection molding process technology. is ensure this precision plastics parts property can, quality and can property and long use stability property, injection molding quality relatively high, combined product design requirements plastics products, must for plastics material, injection molding equipment and mold design and injection molding process 以 and injection molding tube/pipe 理进行完善.
    usually 说 precision injection molding molding is injection molding products outer type degree meet/satisfy dimensions 公差, 形位公差 and surface coarse degree. need precision injection molding must has many related conditions, most essence is plastics material, injection molding mold, injection molding process and injection molding equipment this basic factors. design plastics products 时, 应首先选定 engineering plastics material, can precision injection molding 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 machine. in processing process in, effect/influence precision injection molding products factors main/primary mold temperature degree, injection molding process control, and production ring temperature degree and wet degree 变化幅 degree and rear product 退火处理 and other 方面.

    precision injection molding 而言, mold is use 以取 符 combined quality requirements precision plastics products key/critical 之一, precision injection molding use mold 应切实符 combined products dimensions, degree and requirements, mold material 应严格选取. 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 technology in 就显 十 separation important.

    injection molding 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, meanwhile and mold cooling distribution system related. 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 products molding conditions or as conditions has 关. therefore, in design mold must this effect/influence factors and injection molding conditions and its table/sheet factors, injection molding 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 machine 变化而 different.

due to injection molding 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 processing process, combined design 并按图纸 manufacturing mold, combined selection injection molding processing equipment has important 意义. precision injection molding and injection molding in injection molding pressure and injection speed rate upper has difference, precision injection molding 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 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 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.

    shrinkage rate injection molding pressure 而发生变化, therefore, for/regarding mono type mold, type inner mold cavity pressure amount 一致; more type mold, type between mold cavity pressure versus very small. in mono type more gate or more type more gate lower, must same injection molding pressure injection, make type pressure 一致. is 此, must ensure make gate 位置均衡. is make type inner mold cavity pressure 一致, most good make gate 入口处 pressure maintain 一致. gate pressure and runner in flow retardant force has 关. therefore, in gate pressure to 均衡之 front, make 流通均衡.

    due to melt temperature degree and mold temperature degree for shrinkage rate generate effect/influence, therefore in design precision injection molding mold type 腔时, is 便于确定 molding conditions, must attention/notes type 腔 排列. is melt plastics hot amount belt/tape mold, mold temperature degree degree distribution generally is in type 腔 周围, 呈以主 runner is in 心 同心圆形状.

    therefore, runner 均衡, type 腔排列 and runner is in 心 同心圆状排列 and other design measures, for decrease small type between shrinkage rate 误差, expand large molding conditions scope/range and reduce cost is necessary. precision injection molding mold type 腔排列 methods meet/satisfy runner and runner is in 心排列两方面 requirements, must using/adopting runner is for type 腔排列 methods, 否则会造 formed type shrinkage rate 差异.

    due to mold temperature degree for molding shrinkage effect/influence very large, meanwhile 也直接 effect/influence injection molding products force property can, also 会引起 products surface and other various molding defect, therefore must make tool maintain in temperature degree scope/range inner, but also also need make mold temperature degree time 变化而变化. more type mold type between temperature 差也不 发生变化. is 此, in mold design in must for mold add hot or cooling temperature degree control measures, is make mold type temperature amount shrink small, must attention/notes temperature 控- cooling design. in type 腔, type temperature 控回路 in, main/primary has cooling and cooling types methods.

  from hot efficiency 看, cooling water flow 应呈紊流. is in cooling in, formed is separation 流 一 strip/profile in amount ratio in cooling in amount small, this can can formed 层流, but also 实际进入每 strip/profile in amount 也不一定 same. due to 进入各回路 cooling water temperature degree same, type temperature degree same, 但实际 upper 因各回路 in amount different, strip/profile cooling can force same, make mold cavity temperature degree can can 一致. using/adopting cooling disadvantages is cooling water flow retardant force large, most front type 腔入口处 cooling water temperature degree most rear type 腔入口处 cooling water temperature degree has obvious 差别. cooling water 出入口 temperature 差因流 amount large small 而变化. for/regarding processing. plastics parts small type precision injection molding mold 而言, generally from reduce mold cost 考虑, using/adopting cooling relatively 适宜. if use mold temperature adjustment control 仪(machine) property can can in 2℃ inner control cooling water amount, type temperature most large can maintain in 2℃ scope/range inner.

    mold type and type has cooling water system. in cooling design upper, due to from type and type upper hot amount different, structure hot retardant force 也不一样, type and type 芯入口处 water temperature generate very large temperature 差. using/adopting system, cooling design relatively difficult. generally. plastics parts use small type injection molding mold type very small, using/adopting cooling water system has very large difficult. has can can, can using/adopting by copper material manufacturing type 芯, for 实心铍青 copper type can using/adopting 插入式 cooling methods. another, in for injection molding products anti warpage countermeasures 时, 也希望 type and type between maintain temperature 差. therefore type and type cooling 回路时应 can separation 别进行 temperature degree adjustment and control. is maintain in injection molding pressure, clamping force lower mold degree, design mold structure must for type parts abrasion 削, abrasion and light and other processing can property. tube/pipe type 腔, type processing already to high degree requirements, but also shrinkage rate expected 一样, due to molding in 心偏移, its molding products inner 侧, outer related dimensions very difficult to plastics parts design requirements. is maintain 动, type in separation type upper dimensions degree, remove 设置常规 mold commonly used 导柱, sleeve/set in outer, also must add 装锥形定位销 or block and other 定位以 ensure 定位精 degree 准确, can 靠.

    precision injection molding technology is plastics parts main/primary and key/critical production technology, precision injection molding mold design is this production technology main/primary separation, combined design precision injection molding mold is obtain precision products and necessary front 提. through combined 理 确定 mold dimensions and 公差, anti injection molding products generate shrinkage rate 误差, injection molding deformation, demolding deformation, and other, and ensure mold degree and other technology measures, using/adopting positive precision injection molding process, suitable engineering plastics material and precision injection molding equipment, make to most 佳 匹配!