Shanghai Daoqin Plastics Co., Ltd.

injection molding mold is in molding in plastics 以形状 and dimensions parts. mold structure although due to plastics product types and property can, plastics products and structure and injection machine type type and other different can can 千变万化, is basic structure is 一致. mold main/primary 由浇注 system, molding parts and structure parts separation formed. its in system and molding parts is and plastics 直接接触部 separation, plastics and products 而变化, is in most complex, most large, requirements processing light degree and degree most high separation.

浇注 system is plastics from 射嘴进入 type front runner separation, 包括主 runner, cold material 穴, separation runner and gate and other. molding parts is formed products various parts, 包括动模, and type 腔, type 芯, molding and gas and other. type structure 如图 示.

主 runner
it is mold in injection machine 射嘴至 separation runner or type 腔 一段通道. runner 顶部呈凹形以便 and nozzle 衔接. runner Imported 直径应略 large nozzle 直径(O．8mm)以避免溢 material, anti 止两者因衔接不准而发生 堵截. Imported according to products large small 而定, generally is 4—8mm. runner 直径应 toward inner expand large 呈3° to 5° degree, runner material demolding.

cold material 穴
it is in runner 末端 一 空穴, use 以捕集射嘴端部两次 injection between generate cold material, from anti separation runner or gate 堵塞. if cold material mixed type 腔, made products in easy generate internal stress. cold material 穴 直径约8一lOmm, deep degree is 6mm. is demolding, its 底部常由 demolding 杆承担. demolding 杆 顶部宜 design formed 曲折钩形 or lower 陷沟槽, demolding can 顺利拉出主 runner material.

separation runner
it is more in 连接主 runner and type 腔 通道. is make material and other speed degree 充满各 type 腔, separation runner in upper 排列应 formed for and and other distribution. separation runner 截面 形状 and dimensions for plastics melt flow, products demolding and mold manufacturing difficult easy has effect/influence. if versus and other material amount flow 说, 则以圆形截面 runner retardant force most small. 但因圆柱形 runner ratio surface small, for separation runner material cooling 不利, but also this type of separation runner must in semi upper, 既费工 also easy for 准. therefore, using/adopting is or semi 圆形截面 separation runner, 且开设 in belt/tape has demolding 杆 一 semi mold upper. runner surface must light decrease/reduce flow retardant force provide relatively fast speed degree. runner dimensions 决定于 plastics product types, products dimensions and thick degree. for large more thermoplastic property plastics 说, separation runner wide degree ultra- 8m, large can 达10一12m, small 2-3m. in meet/satisfy need front lower amount decrease small 截面积, increase separation runner material and long cooling time.

gate
it is 接通主 runner (or separation runner) and type 腔 通道. 通道 截面积 can and runner (or separation runner) versus and other, usually is shrink small. therefore it is runner system in 截面积 most small separation. gate and dimensions for products quality effect/influence very large. gate function is: A, control material speed degree: B, in injection in can 因存于 this separation material 早凝而 anti 止倒流: C, make through material to relatively strong/high 剪切而 rise high temperature degree, from reduce table/sheet viscosity high flow property: D, products and runner system separation 离. gate 形状, dimensions and design 取决于 plastics property 质, products large small and structure. generally gate 截面形状 is or 圆形, 截面积宜 small long degree short, this not only upper function, also is small gate large relatively easy, large gate shrink small very difficult. gate generally in products most thick also effect/influence appearance 方. gate dimensions design 应考虑 to plastics melt property 质.

type 腔
it is mold in molding plastics products 空间. used as molding 腔 组 parts is molding parts. molding parts has specialized 名称. formed products outer molding parts is 凹模(also anionic 模), formed products internal 形状(如孔, and other) is type or 凸模(also cationic 模). design molding parts 时首先 need according to plastics property can, products 几何形状, dimensions and use requirements type 腔 总体 structure. its is according to structure selection separation type 面, gate and gas 孔 位置以 and demolding methods. most rear 则按控 products dimensions 进行各 parts design and 确定各 parts between combined methods. plastics melt type tool has very high pressure, molding parts need combined material selection and strong/high degree and rigid degree 校核. is ensure plastics products surface light 洁美观 and easy demolding, and plastics surface, its coarse degree Ra>0．32um, but also need corrosion resistant. molding parts generally through hot improve/increase hardness, selection corrosion resistant manufacturing.

排 gas 口
it is in mold in 开设 一 types 槽形出 gas 口, use 以排出原 has and material belt/tape gas 体. material type 腔时, 原存于 type inner gas and melt belt/tape gas must in material 流 尽头 through gas toward outer 排出, will make products belt/tape has gas 孔, defect, 充模不满, 甚至积存空 gas pressure shrink generate high temperature will products 烧伤. generally lower, gas can in type inner material flow 尽头, can in separation type upper. rear is in 凹模一侧开设 deep 0．03-0．2mm, wide 1．5-6mm shallow 槽. injection in, gas 孔不会 has very more material 渗出, is material in cooling solid will 通道堵死. gas 口 开设位置切勿 for as 人员, anti material outer 喷出伤人. in addition, can utilizing ejection and ejection 孔 配 combined 间隙, block and demolding sheet/plate and type 芯 配 combined and other gas.

structure parts
it is formed mold structure various parts, 包括: toward, demolding, 抽芯以 and separation type various parts. front rear sheet/plate, front rear sheet/plate, pressure sheet/plate, pressure 柱, toward 柱, demolding sheet/plate, demolding and 回程杆 and other.
                  
add hot or cooling plant/unit
this is make material in mold inner solid type plant/unit, for thermoplastic property plastics, generally is anionic cationic inner cooling 介质 通道, cooling 介质 循 ring flow to cooling 目. cooling 介质随 plastics types type and products structure and other 而异, has cold water, hot water, hot and and other. key/critical is high efficiency uniform cooling, cooling non-uniform 会直接 effect/influence products quality and dimensions. according to material thermal properties (包括 crystallization), products and mold structure, cooling 通道 排布 and cooling selection.

injection molding mold and formed
plastics products usually need amount or large amount production, requirements mold use need high efficiency, high quality, molding rear less processing or processing, therefore mold design must 考虑:

1.据塑 parts use property can and molding property can separation type and gate 位置.

2.考虑 mold manufacturing engineering in process property, equipment and technology force amount design solution/scheme, ensure mold from overall to parts easy processing, easy ensure dimensions degree.

3.考虑 injection production rate, improve/increase mono time injection 次数, shrink short molding cycle.

4. will has degree requirements dimensions and 孔, 柱, 凸, and other structure in mold in performance 出, parts molding rear processing or less processing.

5. mold structure force simple suitable, stability can 靠, cycle short cost low, assembly repair and more easy loss parts.

6. mold material selection and 处理.

7. mold standards production: amount selection standards 模架, commonly used 顶杆, toward parts, gate sleeve/set, ring and other standards parts.

一, injection basic formed

1.浇注 system: melt material material from injection machine nozzle type 腔 通道, 包括主 runner, separation runner, gate, cold material 井, material and other.

2. molding parts: molding parts parts, type 芯, type and other parts.

3. temperature system: used for adjustment mold temperature degree.

4.塑 parts ejection system: 包括侧 separation type machine 构, ejection machine 构, 先复位 machine 构几顺序定距 separation type machine and other.

5.安装部 separation: can 靠 安装 in injection machine upper separation.

6.连接 system: will structural parts formed overall system.

7.导 toward system: ensure structural parts versus 互间 移动精 degree, 如导柱, slip and other.