Shanghai Daoqin Plastics Co., Ltd.

一, injection molding processing process can simple table/sheet lower: upper cycle 完 ——闭模—— filling —— holding pressure ——回胶—— cooling —— mold opening —— demolding ——开始 lower cycle in filling holding pressure drop 段, mold cavity pressure time 推移而 upper rise, filling type rear pressure will maintain in versus for 静态 状态, 以补充 due to shrinkage generate amount 不足, another pressure can anti due to injection reduce generate 胶体倒流 phenomenon, this is holding pressure stage/phase, holding pressure 完 之 rear mold cavity pressure decline, time 推移理论 upper can drop to 零, 但实际并不 is 零, therefore demolding rear products internal inner internal stress, has product rear 处理, remove 残存应 force. force, is high or 者链段自由运动 force, bending deformation, force cracking, shrink and other. 二, injection molding processing process main/primary parameters 1, injection molding processing material temperature degree, melt temperature degree for melt flow property can main/primary function, due to plastics has specific melting point, melting point is 一 熔 melt lower temperature degree 段, plastics separation structure and formed different, for its flow property effect/influence different, rigid property separation 子链受 temperature degree effect/influence relatively obvious, 如PC, PPS and other, flexible separation 子链如: PA, PP, PE and other flow property through temperature degree obvious, therefore according to different material combined injection molding processing temperature degree. 2, injection molding processing speed degree is melt in inner （亦 is screw speed degree ） speed degree （MM/S） injection speed degree product appearance, dimensions, shrinkage property, flow distribution and other, generally is slow —— fast —— rear slow, use relatively speed degree is melt more runner, separation runner, gate, to balanced 射胶 目, rear fast speed methods filling mold cavity, again relatively slow speed degree shrinkage and 逆流引起 胶 material phenomenon, to gate 冻结, this can 克服烧焦, gas marks, sink marks and other quality defect generate. 3, injection molding processing pressure is melt front 进 需 retardant force, effect/influence product dimensions, weight and deformation and other, different plastics product injection molding processing pressure different, for/regarding 象PA, PP and other material, increase pressure make its flow property significantly improvement, injection pressure large small product density, appearance gloss property. 4, injection molding processing mold temperature degree, has plastics material due to crystallization temperature degree high, crystallization speed degree slow, need relatively high mold temperature, has due to control dimensions and deformation, or demolding need, need relatively high temperature degree or relatively low temperature degree, 如PC generally requirements 60 degree above, 而PPS is to relatively good appearance and improvement flow property, mold temperature has need 160 degree above, injection molding processing mold temperature degree for improvement product appearance, deformation, dimensions, 胶模方面 has can function. 三, injection molding processing parameters 含义说明 1, injection amount injection amount is injection molding processing machine screw in injection molding parts 时, toward injection molding parts mold inner injection melt amount. injection amount = screw 推进容积*ρ*C ρ is injection molding parts material material density C for crystallization type polymer is 0.85, for non crystallization type polymer is 0.93 injection molding parts machine can use processing small injection amount 1/10 or ultra- injection amount 70% products 2, amount 行程(预塑行程) injection 程序终止 rear, screw in material most front 端, 当预塑程序 to 达时, screw 开始旋转, material material by to screw 头部, screw in material material function lower rear 退, to 限位开关 is 止, process is amount process. injection amount large small and amount 行程 精 degree has 关, small, injection amount 不够, large, make material front 部每次 injection rear material large, make melt temperature degree or hot separation understanding. rear amount in melt its toward temperature degree and toward temperature degree has temperature 差, screw 转数, back pressure and material temperature degree will for melt temperature degree and temperature has relatively large effect/influence. 3, anti amount anti amount is screw amount to rear, also 直线 倒退一距离, make amount ratio large, inner pressure decline, anti 止流体 from amount in 流出. anti also has is injection nozzle rear 进行预塑时, reduce nozzle runner system pressure, reduce internal stress, in mold opening easy material, anti amount large make amount in has bubbles, for viscosity large material material can anti amount. above parameters through combined 理调校 can to combined quality requirements product, dimensions can through injection molding parts pressure, mold temperature, injection molding parts speed degree, back pressure to. 四, how to relatively injection molding parts process parameters · temperature degree control hot electrical 偶也广泛应 used as temperature degree control system device. in control device upper, setting need temperature degree, 而感应 device will and setting upper generate temperature degree versus comparison. in this most simple system in, temperature degree to setting 点时, 就会关闭, temperature degree decline rear electrical also heavy new 开启. this type of system is control, is it is is 关. · temperature degree temperature degree amount and control in injection molding parts in is separation important. although this amount is versus for simple, more injection molding parts machine has temperature degree or 线路. in more injection molding parts machine upper, temperature degree is hot electrical 偶感应. hot electrical basic upper strip/profile different electrical 线尾部 versus 接而组 formed. if ratio 另一端 hot, will generate micro small electrical 讯; is add hot, 讯号越 strong/high. ·熔胶 temperature degree temperature degree is very important, use material temperature degree is property. temperature degree can in 射嘴处 amount degree or use gas method amount degree. material temperature degree setting 取决于熔胶 temperature degree, screw speed, back pressure, material amount and injection molding parts cycle. if has processing certain 一特定 grade plastics experience, from most low setting 开始. is control, material separation 区, is has setting is same temperature degree. if as time long or in high temperature lower as, will 第一区 temperature degree setting is relatively low value, this will anti plastics 早熔化 and separation 流. injection molding parts front, ensure liquid pressure 油, material 斗封闭 device, injection molding parts mold and material 缸都处于 positive temperature degree lower. · injection molding parts pressure this is plastics flow pressure, can use in or liquid pressure upper device amount. it has solid 定 数 value, injection molding parts mold filling difficult, injection molding parts pressure increase large, injection molding parts pressure and injection molding parts pressure is has 直接关系. ·第一 stage/phase pressure and stage/phase pressure #p# separation 页标题#e# in injection molding parts cycle filling stage/phase in, can can need using/adopting high pressure, 以维持 injection molding parts speed degree requirements water 平. injection molding parts mold filling rear again need high pressure. in injection molding parts semi crystallization property thermoplastic property plastics （如PA and POM）时, due to pressure 骤变, make structure 恶化, therefore has must use stage/phase pressure. ·锁模 pressure is for resistant injection pressure, must use pressure, need selection can use most large value, need 考虑投影面积, 计算一 适 combined value. injection molding parts parts 投影面积, is from clamping force application direction to most large 面积. for large more injection molding parts 情况 说, it is 每平方英寸2吨, or 每平方米31兆牛顿. however this is low value, but also as is very coarse experience value, is, injection molding parts parts has deep degree, that 么侧壁便必 must 考虑. · back pressure this is screw rear front must need generate and ultra- 越 pressure, using/adopting high back pressure has color material dispersion uniform and plastics 熔化, meanwhile long in screw time, decrease low filling plastics fiber long degree, increase injection molding parts machine force; back pressure low good, in 任何情况 lower can ultra- injection molding parts machine injection molding parts pressure （ most high 定额） 20%. · injection molding parts speed degree this is screw as is 冲头时, injection molding parts mold filling speed degree. injection molding parts thin products 时, must using/adopting high speed, 以便于熔胶未凝 solid full filling injection molding parts mold, production relatively is light slip surface. filling use series 程序化 射 speed, generate or gas and other defect. injection can in ring or ring control system lower 进行. ·射嘴 pressure pressure is 射嘴里面 pressure. it large is plastics flow pressure. it has solid 定 数 value, is injection molding parts mold filling difficult degree add large increase high. pressure, pressure and injection pressure between has 直接 关系. in 螺旋式 injection molding parts machine upper, pressure large ratio injection pressure less large separation left right. in active injection molding parts machine pressure loss can to separation left right. in active injection molding parts machine pressure loss can to separation 之五十.