Shanghai Daoqin Plastics Co., Ltd.

近代 injection molding processing products, in field/area to application, products 形状十 separation complex, use polymer property can 差别也 very large. is types material products, due to system and 各部位几何形状 different, different for/regarding melt flow （ speed degree, pressure ）提出 requirements, 否则就 need effect/influence melt in this 一部位 流变 property can or polymer/macromolecule crystallization toward function, and products table/sheet quality. in injection process in, screw toward injection molding processing mold melt 时, requirements achieve in different upper has different injection speed degree and different injection pressure and other process parameters control, this type of injection process is more grade injection molding processing. 数字拨码式 injection molding processing machine comparison rear, has or 二段射胶, holding pressure, 一段熔胶 control 程序, for/regarding structure complex, appearance quality requirements high product, very difficult setting and control injection speed degree and its it process conditions, injection molding processing parts 出现 一 appearance defect method through injection molding processing parameters methods improvement. is meet/satisfy improve/increase injection molding processing parts appearance quality need, upper issues, injection molding processing machine manufacturing development production tool has more grade 射胶, more grade holding pressure, more grade function injection molding processing machine, this is injection molding processing processing industry one-time breakthrough property technology 进步. currently, large more is injection speed degree more grade control injection molding processing machine, usually can injection full 冲程像图a that separation 3 or 4 区域, 并 各区域设置 formed different injection speed degree. 如图b, using/adopting in injection use low speed, mold cavity 充填时 use high speed, 充填接近终 时 again use low speed injection methods. through injection speed degree control and adjustment, can anti and improvement products appearance flash/burrs, 喷射痕, strip/profile or and other various defect phenomenon. more grade injection control can according to runner structure, gate and injection molding processing parts structure different, combined setting more injection pressure, injection speed degree, holding pressure pressure and methods, has improve/increase 塑化效果, improve/increase product quality, reduce defect rate and long injection molding processing mold / machine lifespan. through more grade control injection molding processing molding machine pressure, screw 位置, screw speed, can improvement molding parts appearance defect, improvement sink marks, warpage and flash/burrs for measures, decrease/reduce 各模每次 injection molding processing molding parts dimensions 不均一. more grade control formed type strip/profile parts 效 果注 塑 speed degree anti gate gas marks /流纹, anti 止锐角 flow 痕迹, anti 止模芯 倒塌, anti flash/burrs. 二 次 pressure force decrease light internal stress 变, anti sink marks. 螺 杆 转 数计 amount stability property pressure amount stability property however, very more injection molding processing technology still 然习惯 use 一段射胶 methods, how to more 段射胶位置 and methods, make tool has more 段射胶 function machine 发挥不 its advantages. 一, setting more grade injection methods: generally parts injection molding processing less need setting or 四段射胶才 is comparison 科学. water runner is 第一段, gate is 第二段, product to 90% left right is 第三段, 剩余 部 separation is 第四段(亦称末段). for/regarding structure simple appearance quality requirements high parts injection molding processing 时, can using/adopting 三段射胶 程序. for structure comparison complex, appearance defect more, quality requirements high parts injection molding processing 时, using/adopting above control 程序. setting 几段射胶程序, need according to runner structure, gate 形式/位置/数 amount / large small, injection molding processing parts structure, product quality and injection molding processing mold gas and other factors 进行科学 analysis, combined setting. 二, more grade injection selection methods: 1, weight method weight = has parts separation weight + runner separation weight injection 时 射胶 amount is weight, 一段射胶位置即 is runner separation amount; 二段射胶位置即 is product 走胶90%时 射胶 amount; is 末段 射胶 amount. 2, debugging method according to 自己 初步估计, will injection 时 找位置点 pressure / speed degree is 零, 观察实际走胶 位置, again according to 实际情况进行 micro 调, 直至找 to need selection 位置. lower 面以图例说明 products and more grade control between 关系图一 is according to process conditions different speed degree, for injection screw more grade speed degree 转换（切换）. is for products 几何形状 analysis upper selection more grade injection molding processing process: due to products type relatively deep also relatively thin, make injection molding processing mold type formed long narrow runner, melt this 部位时必 must very fast through, easy cooling solid, 会导致充不满 mold cavity 危险, in setting high speed injection. is high speed injection to melt belt/tape very large can, melt to 底时会 generate very large property impact, can amount loss and phenomenon, this must make melt decrease speed, reduce pressure need usually holding pressure pressure （二次 pressure, rear pressure ） make melt in gate solid front toward mold cavity inner melt shrinkage, this for injection molding processing process more grade injection speed degree and pressure requirements. in in screw amount is according to products use material amount and amount setting. injection screw from 位置“97” to “20” is products thin separation, in stage/phase setting high speed value is 10, its is high speed can anti melt dispersion hot time long flow 终止; screw from 位置“20”→“15”→“2”时, also setting versus low speed 5, its is decrease/reduce melt speed and its impact injection molding processing mold can. screw in “97”, “20”, “5” 位置时, setting relatively high one-time injection pressure 以克服充模 retardant force, from “5” to “2”时 also setting relatively low injection pressure, decrease small can impact. injection molding processing machine also tool has more grade and more grade holding pressure function.