Shanghai Daoqin Plastics Co., Ltd.

injection molding machine clamping force 以锁紧 mold most large value table/sheet 示. injection shot formed 形空间 inner （cavity） 材 material pressure as used for mold direction, must in clamping force below/following, usually material pressure must is clamping force 80％ below/following. material pressure is formed 形空间 mono 位面 积 平行 pressure formed formed 形空间投影面积之积. formed 形空间 mono 位面积 平均 pressure injection shot machine 构而异, 柱塞式约400－500㎏／㎝, screw 式约250－350㎏／㎝.
　　（1） experience 公式:
　　 injection molding machine clamping force = formed 形空间 mono 位面积 平均 pressure × formed 形空间投影面积×系数× formed product long × formed product wide ×注: 1. formed product long, wide mono is cm; clamping force mono is kg, remove 以1000就 is injection machine 吨位（T）; formed 形空间 投影面积 is formed product 投影面积, 如箱体 type formed product, need will formed product 四侧面展开 rear, again amount its long and wide.
　　（2）计算 good injection molding machine rear, again according to 此计算结果 selection injection machine （ selection injection machine 吨位必 must need large 于此计算结果）. is need attention/notes selection injection machine 哥林距离 and most large most small thick, mold most large long wide dimensions must small selection injection machine 哥林距离, mold high degree must in selection injection machine most large most small thick between.

according to product weight or injection molding amount selection different 吨位, 如30T, 40T, 50T, 60T, 80T, 100T, 120T, 160T, 168T, 268T, currently inner most large has 4000T, 吨位越 large, injection molding machine screw 直径也就越 large ……

generally 而言, from injection molding industry more year more semi has can force 自行判断并 selection combined injection molding machine production. is in certain lower, can can need 厂商 协助才 can using/adopting specifications injection molding machine, 甚至客户 can can has product sample or 构想, rear 询问厂商 machine is can production, or is types machine type comparison combined. in addition, certain product can can need 搭配特殊 plant/unit pressure device, 闭回路, injection shot pressure shrink and other, can more has efficiency production. can 见, how to combined injection molding machine production, is 一 极 is important issues. below/following provide to 读者参考.

    usually effect/influence injection shot machine selection important factors mold, product, plastics, molding requirements and other, therefore, in selection front must 先收集 or tool lower 列资讯:

　 mold dimensions (wide degree, high degree, thick degree ）, weight, design and other;

     use plastics types type and amount （ mono raw materials or multiple plastics ）;

     injection molding formed product appearance dimensions （ long, wide, high, thick degree ）, weight and other;

　　 molding requirements, quality conditions, production speed degree and other.

     in obtain above rear, can according to lower steps selection combined injection shot machine:

     1, for type: product and plastics machine types and series.

    due to injection shot machine has non more types type, therefore 一开始 need positive 确判断此 product 应由哪一 types injection molding machine, or is series production, is generally thermoplastic property plastics or electrical raw materials or PET raw materials and other, is mono color, di color, more color, or mixed color and other. in addition, certain product need high stability （闭回路）, high precision, ultra-high speed, high pressure or fast speed production （ more 回路） and other conditions, must selection combined series production.

    2, lower: mold dimensions machine 台 “ large inner 距”, “模 thick ”, “ mold most small dimensions ” and “模盘 dimensions ” is 否适当, 以确认 mold is lower.

    mold wide degree and high degree small or less has small large inner 距;

    mold wide degree and high degree most good in dimensions scope/range inner;

    mold thick degree 需介于 injection molding machine thick between;

    mold wide degree and high degree combined injection molding machine most small mold dimensions, small 也不行.

    3, 拿 出: mold and formed product 判定“ mold opening 行程” and “托模行程” is 否足以 let formed product 取出.

    mold opening 行程至 less large formed product in 开关模 direction high degree above, 且需含竖浇道（sprue） long degree;

　托模行程需足够 will formed product ejection.

     锁 住: product and plastics 决定“ clamping force ”吨数.

     raw materials high pressure 注入模穴 inner generate 一 撑模 force amount, therefore injection molding machine mono must provide 足够 “ clamping force ” make mold 不至于 by 撑开. clamping force demand 计算如 lower:

    formed product appearance dimensions formed product in 开关模 direction 投影面积;

    force amount ＝ formed product in 开关模 direction 投影面积(cm2)×模穴数×模 inner pressure (kg/cm2);

    inner pressure raw materials different, generally raw materials 取350～400kg/cm2;

    machine clamping force large 于撑模 force amount, is 保险起见, machine clamping force usually large 于撑模 force amount 1.17倍 above.

    already 初步决定夹模 mono specifications, large 致确定 machine types 吨数, 接 必 must again lower steps, 以确认哪一 injection shot mono screw comparison combined 需.

　5, saturated: formed product weight and 模穴数判定 需“ injection shot amount ”并 selection combined 适 “ screw 直径”.

    formed product weight 需考虑模穴数（一模几穴）;

    is stability property 起见, injection shot amount is formed product weight 1.35倍 above, formed product weight is injection shot amount 75％以 inner.

    good: plastics 判定“ screw pressure shrink ratio ” and “ injection shot pressure ” and other conditions.

    has engineering plastics need relatively high injection shot pressure and combined screw pressure shrink ratio design, has relatively good molding 效果, therefore is make formed product more good, in selection screw 时亦需考虑射 pressure demand and pressure shrink ratio issues.

　 generally 而言, relatively small screw can provide relatively high injection shot pressure.

　7, fast: and “ injection shot speed degree ” 确认.

    has formed product need high injection shot rate speed injection shot can stability molding, ultra- thin type formed product, in 此情况 lower, can can need machine injection shot rate and speed is 否足够, is 否需搭配蓄 pressure device, 闭回路 control and other plant/unit. generally 而言, in same conditions lower, can provide relatively high pressure screw usually speed relatively low, versus 反, can provide relatively low pressure screw usually speed relatively high. therefore, selection screw 直径时, injection shot amount, injection shot pressure and injection shot rate （ injection shot speed degree ）, 需交叉考 amount and 取舍.

    in addition, can using/adopting more design, 以同步 composite/compounding as shrink short molding time.

    above steps rear, upper already can 决定符 combined demand injection molding machine, is has 一 特殊 issues can can must again add 以考虑, 包括:

　　 large small issues:

　　 in certain 特殊状况 lower, mold or product can can mold small 但 需射 amount large, or mold large 但 需射 amount 　 small, in this type of lower, 厂家 预先 setting standards specifications can can method combined demand, must 进行 谓“ large small 配”, 亦即“ large small 射” or “ small large 射”. 谓“ large small 射”指以原先 standards mono 元搭配 relatively small injection shot screw, 反之, “ small large 射”即 is 以原先 standards mono 元搭配 relatively large injection shot screw. 当然, in upper can can and injection shot versus good grade.

　◆ fast speed machine or high speed machine 观念:

    in 实际运 use in, 越 越 more 客户会 requirements 购买 谓“ high speed machine ” or “ fast speed machine ”. generally 而言, its remove product demand outer, other large more is need shrink short molding cycle, improve/increase mono time output/production volume, reduce production cost, improve/increase competition force. usually, need to upper 述目, has types method:

    ◆ injection shot speed degree add fast: will electrical machine and add large, or add pressure device （ most good add 闭回路 control ）;

    ◆ add material speed degree add fast: will electrical machine and add large, or add material pressure 马达改 small, make screw speed add fast;

    ◆ more system: using/adopting di or 三回路 design, 以同步进行 composite/compounding as, shrink short molding time;

    ◆ increase mold water 路, improves mold cooling efficiency.

    however, “天 lower has 白吃 午餐”, machine property can improves and renovation solid can increase production efficiency, 但往往也 increase investment cost and cost, therefore, investment front assessment fine amount, can most combined machine type generate most high 效益.