Shanghai Daoqin Plastics Co., Ltd.

injection molding parts molding is engineering technology, it and inner is will plastics is has use can maintain has property can products. injection molding parts molding important process conditions is effect/influence flow and cooling temperature degree, pressure and versus 应 各 function time. 一, temperature degree control 1, material temperature degree: injection process need control temperature degree has material temperature degree, nozzle temperature degree and injection molding parts mold temperature degree and other. front types temperature degree main/primary effect/influence plastics and flow, rear types temperature degree main/primary is effect/influence plastics flow and cooling. types plastics tool has different flow temperature degree, types plastics, due to or grade different, its flow temperature degree and separation understanding temperature degree is has 差别, this is due to molecular weight and molecular weight distribution different 致, plastics in different type type injection machine inner process is different, selection material temperature degree same. 2, nozzle temperature degree: nozzle temperature degree usually is low material most high temperature degree, this is is anti material in 直通式 nozzle can can 发生 "流涎 phenomenon ". nozzle temperature degree can low, will formed material 早凝而 will nozzle 堵*, or due to material mold cavity effect/influence products property can 3, injection molding parts mold temperature degree: injection molding parts mold temperature degree for products inner in property can and table/sheet quality effect/influence very large. injection molding parts mold temperature degree high low 决定于 plastics crystallization property has 无, products dimensions and structure, property can requirements, and its it process conditions （熔 material temperature degree, injection speed degree and injection pressure, cycle and other ）. 二, pressure control: injection molding parts process in pressure 包括塑化 pressure and injection pressure types, 并直接 effect/influence plastics and products quality. 1, pressure: （ back pressure ） using/adopting screw injection machine 时, screw 顶部熔 material in screw rear 退时 受 to pressure is pressure, back pressure. this type of pressure large small is can through liquid pressure system in 溢流阀 adjustment. in injection in, pressure large small is screw speed 都不变, increase pressure 时即会 improve/increase melt temperature degree, decrease small speed degree. in addition, increase pressure can make melt temperature degree uniform, color material mixed combined uniform and melt in gas 体. generally as in, pressure 决定应 in ensure products quality excellent front lower low good, its specific value is use plastics product types 而异, usually very less ultra- 20公斤/平方 cm. 2, injection pressure: in currently production in, has injection machine injection pressure is 以柱塞 or screw for plastics pressure （由油路 pressure 换算 ） is 准. injection pressure in injection molding parts molding in function is, plastics from material toward type flow retardant force, to material speed rate and for material pressure 实. 三, molding cycle formed one-time injection process time molding cycle, 也称模塑 cycle. it 实际包括 below/following separation: molding cycle: molding cycle effect/influence production rate and equipment utilizing rate. therefore, in production process in,应 in ensure quality front lower,尽 amount shrink short molding cycle in has time. in molding cycle in,以 injection time and cooling time most important, it for products quality has property effect/influence. injection time in time 直接反 ratio 于充模 speed rate, production in time generally is 3-5秒. injection time in holding pressure time is for type inner plastics pressure time, in injection time inner ratio/proportion relatively large, generally is 20-120秒(特 thick made parts can high 达5~10 separation 钟). in gate material 封冻之 front, holding pressure time how much, for products dimensions property has effect/influence,若 in rear,则无 effect/influence. holding pressure time has most value, already it 依赖于 material temperature, mold temperature and runner and gate large small. if runner and gate dimensions and process conditions is positive 常, usually 即以 出 products shrinkage rate scope/range most small pressure value is 准. cooling time main/primary 决定于 products thick degree, plastics thermal properties and crystallization property can,以 and injection molding parts mold temperature and other. cooling time 终点,应以 ensure products demolding 时不引起变动 is 原则, cooling time property generally in 30~120秒钟 between, cooling time long has necessary, not only reduce production efficiency, for complex made parts also will formed demolding difficult, strong/high demolding 时甚至会 generate demolding force. molding cycle in its it time and production process is 否连续化 and 自动化以 and 连续化 and 自动化 程 degree and other has 关. generally injection molding parts machine can according to below/following as 调校: according to raw materials supply 商 资 material provide temperature degree scope/range, will material temperature degree 调至该 scope/range in 间, adjustment mold temperature. 估计 需 射胶 amount, will injection molding parts machine 调至估计 most large amount separation 之二. 调校倒索(抽胶)行程. and 调校二 grade injection molding parts time, will grade injection molding parts pressure 调至零. 初步调校一 grade injection molding parts pressure injection molding parts machine 极限 一 semi (50%); will injection molding parts speed degree most high. and need cooling time. will back pressure 调至3.5bar. remove material inner already degradation resin. using/adopting semi injection molding parts 模式; injection molding parts 程序, screw as. need 而适当 adjustment speed degree and pressure, need make time shrink short, can increase injection molding parts pressure. front 述, due to 十足充模之 front has process, most pressure can 调至一 grade injection molding parts pressure 100%. pressure most need 调 够 high, make can to most large speed degree setting pressure made. has material, can speed degree decrease low. 每观察一 cycle rear, 便 射胶 amount and 转换点 adjustment. setting 程序, make can in grade injection molding parts already can obtain 按射胶 weight 计算达 to 95-98% 充模. 当第一 grade injection molding parts injection amount, 转换点, injection molding parts speed degree and pressure adjustment rear, can 进行第二 grade holding pressure pressure 调校程序. need 适当调校 holding pressure pressure, 但切勿 份充填 mold cavity. screw speed degree, ensure rigid in cycle formed front already formed, injection molding parts cycle also has to made. shrink short cycle time improve/increase production rate for large separation injection molding parts injection molding parts processing 商 说, injection molding parts cycle can effect/influence below/following main/primary 目: 1, from machine in to more more made parts; 2, made parts combined 乎客人 requirements. injection molding parts cycle below/following formed: cycle 开始-- screw front 进, injection; made parts gate cooling screw 开始转动--塑化行程开始 screw 回位完 formed -- screw 转动停止 如 necessary 话抽胶发生 injection molding parts mold 打开（ can can 包括模芯 拉出） made parts separation cooling can ejection ejection injection molding parts mold combined （ can can 包括模芯 回位） injection molding parts mold upper -- cycle heavy new 开始. injection molding parts cycle is in same lower, 同样 事情 one-time also one-time heavy 复. cycle has main/primary separation: mold opening time; filling time; injection molding parts mold combined time; holding pressure time improve/increase production force target/goal is in short time inner formed has necessary as, formed ejection, ensure injection molding parts mold to 保护（包括拉出 and slip block and 侧位模芯）. therefore, 任何, mold opening time injection molding parts mold or injection molding parts machine issues must repair. another, 如每次 injection mold opening time 都不一样, made parts will 亦不一样. injection molding parts filling mold cavity （由1-2） 以 flow property relatively good material 而言(如Delrin? polyoxymethylene (POM), Zytel? and Zytel? ST nylon, and Crastin?, Rynite? poly 脂), this filling time 应占整 cycle 1/10至1／8 time, filling most key/critical is fast speed and stability screw time, and most low and stability injection molding parts pressure. screw toward front will solvent material tube/pipe 经喷咀, runner, 横流通, gate, again mold cavity, in to retardant force. this retardant force is 由喷咀直径, runner dimensions, gate large small, product thick degree, and injection molding parts mold gas design effect/influence. flow retardant force in injection molding parts mold inner improvement and decrease/reduce, 以达至 filling balanced and stability. due to filling non-uniform 而导致 different mold cavity injection molding parts products dimensions different, strong/high degree 不足, or appearance defect. holding pressure time （2-3） 当 injection molding parts crystallization material 时, holding pressure time is most important process. this time is melt filling mold cavity 99％开始至 gate solid is 终止. parts strong/high degree and tough property is 决定于 injection molding parts rear has maintain pressure to melt upper 直至部 parts ／ gate solid. maintain pressure need 预先保留一 small 段 熔胶位置 in screw front. this holding pressure 一段就 is anti melt solid shrinkage rear 空洞, or gate low and other 导致模 parts strong/high degree key/critical. cooling time （4-7） 当 melt mold cavity, to metal surface 时, melt cooling steps 就己经开始. due to polyoxymethylene (POM), nylon, and poly carbon and other semi crystallization material solid temperature degree very high, therefore need cooling time very less. generally parts 说, in 熔胶完 formed rear, parts already has cooling time. if in ejection parts 时发现出 issues 话, can slow slow will cooling time long, issues solution is 止. mold opening time （8-11） injection molding parts mold time is cycle important 部份, especially is for has parts injection molding parts mold more is 如此, in comparison standards injection molding parts mold in, injection molding parts mold open time 也经常 high cycle 20％. effect/influence mold opening factors: 第一项 need is injection molding parts mold speed degree and 移动距离, injection molding parts mold in 打开并 ejection made parts process in 移动 距离应 decrease/reduce 以免浪费移动 time, 当然, injection molding parts mold 移动必 must in injection molding parts mold again 次关闭 front let made parts 顺利脱离 injection molding parts mold, therefore, let made parts demolding 需移动距离愈 short, its 花 间愈 less, injection molding parts molding machine 处于良 good 状态, from high speed to low speed ejection can versus 当平稳. equipment need maintenance formed this speed degree upper 变化, is this can from time decrease/reduce, time to more 倍 回报. is to most less injection molding parts mold time, adjustment decrease speed made 开关, 以便预出 process in injection molding parts mold 不会 于接触 or bad made parts, optimization high speed 段. again 者, cycle property maintenance ensure this decrease speed can heavy 复. generate pressure time in injection molding parts mold open time in is retardant 延, this time can can machine abrasion loss and liquid pressure 阀失效 effect/influence, therefore cycle property machine maintenance can maintain good as 状态. attention/notes: shrink short injection molding parts mold 打开行程 to most small, made parts and runner troubleshooting make ejection difficult factors, 像顶针周围 flash (披锋) shrink short ejection to most small value use most fast mold opening and speed degree, meanwhile need slow slow in and combined anti loss bad injection molding parts mold has and generate pressure in retardant 延, it table/sheet machine or liquid pressure fault/failure in injection molding parts mold in a large amount of parts active growth injection molding parts mold open time. add product design (decrease/reduce 倒扣)就往往 can make ejection as 自动化 or semi 自动化进行 若 this is injection molding parts mold loss consumption 导致, 理应修理 injection molding parts mold, decrease low 延误. formed good injection molding parts machine as 习惯养 formed good injection molding parts machine as for improve/increase machine lifespan and production safety large has benefits. 1 开 machine front: （1）检查 electrical appliances control inner is has water, 油进入, electrical appliances 受潮, 切勿开 machine. repair will electrical appliances parts dry rear again machine. （2）检查供 electrical electrical pressure is combined, generally ultra- ±15%. （3）检查急停开关, front rear safety 门开关 is positive 常. electrical machine and 油泵 转动 direction is 否一致. （4）检查各 cooling pipeline is 否畅通, for cooling device and machine 筒端部 cooling water sleeve/set cooling water. （5）检查各 active 动部位 is has lubricated 油（脂）, add lubricated 油. （6）打开 electrical hot, for machine 筒各段进行 add temperature. 当各段 temperature degree to requirements 时, again temperature time, make machine temperature degree stability. temperature time according to different equipment and plastics raw materials requirements has different. （7） in material inner add 足足够 plastics. according to injection molding parts different plastics requirements, has raw materials most good drying. （8） need cover/cap good machine upper thermal insulation 罩, this can electrical can, also can long electrical hot and electrical 流接触 device lifespan. 2 操 as process in: （1）不 need is 贪图方便, 随意取消 safety function. （2） attention/notes pressure temperature degree, temperature need ultra- 出规定 scope/range. liquid pressure 油 理想工 as temperature degree maintain in 45~50℃ between, generally in 35~60℃ scope/range inner comparison combined 适. （3） attention/notes adjustment 各行程限位开关, machine in as generate 撞击. 3 工 as 结束时: （1）停 machine front, will machine inner plastics dry 净, anti material oxidation or long hot separation understanding. （2）应 will injection molding parts mold 打开, make machine long time 处于闭锁状态. （3） workshop must has equipment. injection molding parts mold and other heavy parts 时应十 separation small 心, ensure production safety. injection molding parts machine use in Knowledge 一, back pressure use back pressure application can ensure screw in 旋转复位时, can generate machine can amount, plastics and mixed combined. back pressure also has below/following applications: property gas 体, 包括空 gas 排出射 material outer; add agent （例如 color powder, color types, anti-static agent, slip powder and other ） and material uniform mixed combined 起; make screw long degree material uniform 化; provide uniform stability 塑化材 material obtain formed product weight control. selection back pressure value is can can low （例如4-15bar, or 58-217.5psi）, need material has density and uniform property, material inner has bubbles, property gas and full plastics can. back pressure utilizing make injection molding parts machine pressure temperature degree and material temperature degree upper rise. upper rise degree and setting back pressure value has 关. relatively large type injection molding parts machine （ screw ultra- 70mm/2.75in） 油路 back pressure can high 至25-40bar(362.5-580psi). need attention/notes, high back pressure in material inner material temperature degree high, this for/regarding hot amount very plastics production is has bad function. but also high back pressure 亦引起 screw large and 不规则 越位情况, make amount unstable. how much is plastics elastic property features effect/influence. material can amount more, screw in 停止旋转时, generate toward rear 跳动, thermoplastic property plastics phenomenon relatively other plastics 厉害, 例如LDPE, HDPE, PP, EVA, PP/EPDM combined formed material and PPVC, comparison 起GPPS, HIPS, POM, PC, PPO-M and PMMA都 relatively easy 发生跳动 phenomenon. is obtain most production conditions, positive back pressure setting is important, this 样, material can to mixed combined, screw scope/range 亦不会 ultra- 0.4mm(0.016in). 二, injection molding parts mold combined generally 说, large more injection molding parts machine use injection molding parts mold combined time ratio use time need slow （约100-359%）, this and injection molding parts mold weight, large small and complex property has 关, and injection molding parts mold safety 保护（ in combined as in anti injection molding parts mold loss ） has 关. type injection molding parts mold combined time lower （tcm: injection molding parts machine use time mono 位）: di sheet/plate injection molding parts mold: 1-2tcm composite/compounding injection molding parts mold （包括侧模芯 and plant/unit use ） and more sheet/plate injection molding parts mold: 2-3.5tcm injection molding parts mold combined time ratio 实际运 as time more 15%, that need injection molding parts mold or use 另一台 injection molding parts machine shrink short time. relatively new type injection molding parts machine can provide more fast combined speed degree, use low injection molding parts mold combined （ injection molding parts mold 传感） pressure, 以启动 clamping force combined injection molding parts mold. injection molding parts machine as 员经常没 has attention/notes certain 一特定 injection molding parts machine machine sheet/plate speed degree or time, 而以 人 experience setting injection molding parts mold combined time, this 样往往会令运 as time long. in 一 十秒 运 as upper decrease/reduce 一秒, 便立即 obtain 10% improvement, this improvement 往往就 is formed and loss 差别.