Shanghai Daoqin Plastics Co., Ltd.

in this day competition 剧烈 商业社会 in, improve/increase production efficiency is very value issues. 本文阐述 use has or new design injection molding machine or mold, improvement injection molding cycle multiple method.
      injection molding cycle
      一台油 pressure injection molding machine injection molding cycle from clamping to lower one-time clamping is 止.
clamping generally separation is 四段: fast speed clamping, slow speed clamping, low pressure and high pressure 锁模.
      injection in high pressure 锁模完 formed rear 开始, separation is more 段. injection melt plastics filling mold cavity. mold cavity 填满, pressure rise, injection 末端亦称 is pressure 段（packing phase）. control combined 适 时候, formed product generate flash/burrs.
      holding pressure in injection formed rear 开始. its cooling is from mold cavity filling rear 开始, is from holding pressure 开始. mold cooling 时, formed product cold shrinkage. holding pressure function is also solid cold runner, generally low injection pressure holding pressure pressure, filling shrinkage formed 凹陷, make formed product demolding saturated 满（没 has 凹痕）.
      cold runner solid rear, again holding pressure already has 意义, holding pressure can 终止. holding pressure can separation is more 段, holding pressure pressure different （ generally is 逐段递 decrease ）, time separation. holding pressure time is formed product weight or from formed product has 凹痕而定出. from short holding pressure time adjustment, injection molding one-time increase holding pressure time, formed product weight again increase or generate can 接受时, holding pressure time use again increase.
      injection molding machine upper 置 “ cooling time ” parameters is from holding pressure formed to mold opening time, cooling in mold cavity plastics rear already 开始. “ cooling time ” is make formed product cooling solid 化, to ejection already 不会因 ejection deformation, 应该说, “ cooling time ” is from experiment/testing 出.
      in “ cooling time ”开始时, add material meanwhile 进行. 图１显示“ cooling time ” ratio add material time long. has can can is 如图3般, add material time ratio “ cooling time ” long, 换句话说, 图3显示 screw can force 不足, formed bottle 颈. increase can force is 此案例 shrink short cycle time method, target/goal is to 图1 short add material time.
“ cooling time ”（图1） or “ add material formed ”（图3） rear mold opening, formed product ejection one-time or more 次, rear again clamping, lower cycle 随即开始.

      clamping
      design 肘节式 injection molding machine has recycled clamping 油路, 以争取 more high clamping speed degree. in mold high impact large front lower, using/adopting.
      high pressure 锁模
      using/adopting most low can make formed product generate flash/burrs clamping force, can shrink short high pressure 锁模段 需 time. 况且, mold, injection molding machine 拉杆, and sheet/plate 亦会因 using/adopting low clamping force long lifespan. if certain mold use 50t clamping force 就足够 话, need use 51t clamping force, tube/pipe injection molding machine tool more high clamping force.

      injection
      in formed product generate bubbles or 不因烧焦 plastics generate black spots lower, can use most high injection speed degree. especially is thick injection molding, mold cavity inner has a large amount of gas is melt plastics filling, high injection speed degree make mold cavity inner gas and mold outer, formed bubbles.
use most low injection pressure can versus reduce clamping force （胀模 force ）, use most low material temperature degree can shrink short “ cooling time ”.

      holding pressure
      from formed product weight or can 接受 凹痕 can most short holding pressure time. has very more thin product use holding pressure, formed product inner basic upper in injection 完毕便马 upper solid.

      cooling time
      听 一 说 method: mold is hot device. 不错, mold cold water 道不断 will melt hot amount belt/tape 走, design mold can improve/increase hot efficiency.
however in 允许 情况 lower, water cooling can shrink short “ cooling time ”. water cooling formed mold 凝露, dry machine and 密封 锁模 plant/unit can reduce degree 露点, anti 止凝露.
add material
      若塑化 can force 不够而做 formed bottle 颈, in screw design and parameters adjustment can as below/following 处理:
      1．屏障式 screw can increase can force.
      2． large 直径（C） screw can increase can force.
      3． add large screw deep can increase can force.
      4． add large screw speed can increase can force （ certain for 剪切敏感 plastics 如PVC, PET and other can use method ）.
      5． 尽 can can reduce back pressure, 否则会 increase speed degree.
      6． using/adopting pressure 封咀, make clamping can 塑化.
      7． using/adopting device design can make screw in cycle inner remove injection and holding pressure time outer can 塑化.
      8． using/adopting holding pressure plant/unit, make screw in holding pressure can 塑化.
      methods 1～5试图 will 图3 情况转 formed is 图１ 情况.
      methods 6～7则 using/adopting action as, add material 由独立 油路 or electrical 路驱动.
      methods ８ most used for thick injection molding, is 避免凹痕, thick holding pressure time can can long.
      add material front rear consumption 时, using/adopting elastic or pressure 封咀取代, 省却倒索动 as.

      mold opening
      in 不撕裂 formed product and generate large mold opening 响声 情况 lower, use most high speed mold opening. certain injection molding machine has mold opening front decrease pressure equipment, high speed mold opening 亦不会 generate 响声. is achieve in high speed mold opening lower 停模位置精确, can use 刹车阀 or ring control.

      ejection
      in ejection force large small type injection molding machine upper, can using/adopting gas ejection, ratio pressure ejection speed degree high. electrical ejection also ratio gas ejection fast.
      mold can design formed mold opening as belt/tape ejection, using/adopting injection molding machine upper ejection plant/unit, method can ejection one-time, this is most simple mold opening ejection methods.
      using/adopting 独立 油路, gas or electrical control, can achieve more ejection mold opening ejection function.
配 has and electrical equipment can fast speed analysis one-time ejection rear formed product is full 部掉落. in full 部掉落时才进行第二次 ejection, upper 例99% cycle ejection one-time, 节省 平均 cycle time.

      顶退
      has formed product more ejection can using/adopting injection molding machine ejection. 顶针不 use full 退, shrink short more ejection time.
      most rear one-time can and clamping meanwhile 开始. due to 顶针 行程 ratio sheet/plate short, therefore 顶针总会 full rear 才锁模.

      most short cycle time
      most short cycle time clamping, injection, holding pressure, cooling and mold opening time formed. add material in “ cooling time ” and clamping, in holding pressure meanwhile 进行. more ejection in mold opening meanwhile 进行, most rear one-time in clamping meanwhile 进行. 此案例 most more has 三 动 as meanwhile 进行, 每 动 as has 独立 驱动. can can is 三 都 is 油路（如三 油泵）, 三 都 is electrical 路（ electrical injection molding machine ） or 油路, gas and electrical 路 组 combined.
electrical injection molding machine generally has ４ 伺服马达, separation 别驱动 injection molding, add material, 开, clamping and demolding. its advantages is action as can shrink short cycle. its 实, pressure injection molding machine in use 3 独立油路时亦 can to this 目. therefore this advantages non electrical injection molding machine patent.
      due to mold opening can injection molding, 4 伺服马达亦不 can meanwhile as. 图10 analysis 显示 3 平 action as already can to most short cycle.

      空运行 time
      very more injection molding machine specifications 都标出 空运行 time, generally is 计算出 理论 time, 忽略 模 sheet/plate accelerated and decrease speed, 当然亦没 has 计算移动 mold quality, ratio 起实际 开 clamping time need short. according to Euromap standards, 空运行 time is sheet/plate combined time, combined 行程则定 is 四柱空间 0.7倍.
      in most short cycle 里, has clamping time (空运行 time) and injection time and injection molding machine design has 关.

      thin injection molding
      thin injection molding is 0.5 mm壁 thick or below/following, or process/workflow /壁 thick ratio in 300 above injection molding. is 避免熔 melt plastics in 未充填满 mold cavity already solid, thin injection molding is high speed （ and high accelerated decrease speed ） injection molding. high speed injection molding, screw toward front speed degree in 300 mm/s above. in high speed injection molding lower, injection time generally in 0.5s以 inner. high speed injection is use can device 辅助. in “ cooling time ”充填蓄 can device, can use small in injection and holding pressure outer time 里充填. by high pressure in injection 时释放出, generally can improve/increase injection speed degree 3倍.
      thin injection molding need holding pressure time and “ cooling time ”, most short cycle formed 如图11示, its in 空运行 time is 决定整 cycle time elements.
      gas demolding
      product can use gas demolding 话, mold opening gas is very easy to. generally is in mold opening rear 延时吹 gas, demolding time in mold opening time 里.

      gas demolding
      我厂曾 in 一台 需顶模 force large small type injection molding machine upper achieve gas ejection, make clamping and ejection 顶退并行, 省 约1s 顶针动 as time, this in small type injection molding machine upper is can 观, most rear to 2s cycle time.

      退而求 its 次
      tool has ３ 独立油路 injection molding machine cost is relatively high. 两 平 action as injection molding machine, generally is plant/unit use 一 油路, injection plant/unit use 另一 油路, this is injection molding machine generally separation plant/unit sheet/plate and injection plant/unit sheet/plate 考虑.
      mixed combined electrical injection molding machine types long 处, 巧妙配 combined, generally design is electrical add material combined pressure other as, 例如赫斯基 Hyelectric injection molding machine.

      di injection
      di design in injection use 一 油泵. can as more make injection di lower, from increase injection speed degree 接近一倍.

      hot runner mold
      hot runner can in more shrink short cycle.
      1.  cold runner ratio formed product thick degree more large, “ cooling time ” need and other runner cooling to certain types degree can mold opening, formed product already cooling, formed 浪费.
hot runner mold runner use cooling, formed product cooling time.
      2.  cold runner plastics amount is formed product plastics amount percentage, has ratio formed product weight more heavy, injection and add material time therefore add long. using/adopting hot runner mold 便省却 runner plastics injection and add material time.
      3, cold runner has water 口, mold opening need increase.
      4, more injection molding 时, cold runner ensure formed product and 否, need use machine 械臂取出（ full 自动操 as ） or 人手取出（ semi 自动操 as ）, cycle slow.

      CAP series
      CAP series is bottle cover/cap specialized injection molding machine. bottle cover/cap belongs to thin products, add upper hot runner bottle cover/cap mold, suitable 图15 injection molding cycle.
      CAP series using/adopting 屏障式 large screw, increase can force, in 2s以 inner formed add material as.
  using/adopting di CAP series more add material time. can injection molding 24腔 CAP110 injection molding machine can to 近5s cycle time. CAP series is for 空运行 time optimization, has relatively high clamping speed degree.
      cycle time from 7s drop 至5s, production rate improve/increase 约30%. 24腔 mold day 产（24h） bottle cover/cap ultra- 40万. 而价钱不 high bottle cover/cap can high production rate competition.