Shanghai Daoqin Plastics Co., Ltd.

随 in recent years mold industrial fast speed development, meanwhile new technology, new process application scope expand large and 进步, from experience to soft parts development application already has 质 变化. CADCAM and CAE application is mold and mold product dimensions control technology upper rise 空间, due to mold and mold product market demand very large, types type more, in outer 形, dimensions, material, structure and other 各方面变化 large, requirements high, make in mold and product production process in to less issues and difficult, its in how to has control mold and product dimensions non 常直观 放 in 我们面 front. for/regarding different type type mold and product has different control technology and methods. 今天我 in this 里就 injection molding parts product formed dimensions control 谈点体会, to injection molding parts product also to injection molding parts mold, generally lower is from lower several 方面 手. 　　一　 mold design control 　　1, need for mold structure, material, hardness, degree and other more use technology requirements 进行充 separation understanding, formed 形塑材 shrinkage rate is positive 确, product 3D dimensions type is 否完整, combined 理进行处理 analysis. 　　2, for injection molding parts product shrink 孔, flow marks, 拨模斜 degree, weld lines and cracks and other appearance has effect/influence 各 方 as separation 考虑. 　　3, in 不妨碍 injection molding parts parts product function and 图案造形 front lower, can can mold processing methods. 　　4, separation type selection is 否适当, for mold processing, formed appearance and formed parts 毛刺都 need as fine selection. 　　5, methods is 否适当, using/adopting 推杆, material sheet/plate, sleeve/set tube/pipe and other methods also is its it methods, and material sheet/plate is 否恰当. 　　6, 侧面抽芯 machine using/adopting is combined 适, as active can 靠, 应无卡滞 phenomenon. 　　7, temperature degree control use types methods easy for parts product more combined 适, for temperature 油, temperature water, cooling liquid and other use types structure ring 糸统, cooling liquid large small, amount, and other is 否恰当. 　　8, gate 形式, material and material large small, gate and large small is 否恰当. 　　9, type block and hot deformation effect/influence and standards parts selection is combined 适. 　　10, injection formed machine injection amount, injection pressure and clamping force is separation, nozzle R, gate sleeve/set and other is 否匹配 combined 适. 　　 and other and other this 方面进行 comprehensive analysis 准备, from product parts stage/phase 就应受 to control. 　　二 process manufacturing control 　　 although in design stage/phase comprehensive separation and 安排, in production in also 会出现不 less issues and difficult, need can can in production in combined design 原意图, 找出实际 processing in more add has 效, more add combined process 手段. 　　1, selection 经济适应 machine equipment, as 2D and 3D processing solution/scheme. 　　2, can 考虑适当 工装夹 tool production in 辅助准备工 as, tool combined use, anti product parts deformation, anti product parts shrinkage rate 波动, anti product parts demolding deformation, improve/increase mold manufacturing degree, decrease small 误差, anti mold degree 发生变化 and other and other, series production process requirements and solution measures. 　　3, this 里提一 lower has UK plastics 协会（BPF） formed parts dimensions generate causes and its ratio/proportion separation 配情况: 　　A: mold manufacturing 误差约1/3, B由 mold abrasion loss generate 误差1/6　C由 formed parts shrinkage rate 不均衡 generate 误差约1/3, D预定 shrinkage rate and shrinkage rate 不一致 generate 误差约1/6 　　总 误差=A+B+C+D, 　 therefore can mold manufacturing 公差应 is formed parts dimensions 公差 1/3 below/following, mold difficult ensure formed parts dimensions. 　　三　 usually production control 　　塑 parts formed rear 发生几何 dimensions is 普遍存 in issues, and is 经常会发生 phenomenon: 　　1, material temperature, mold temperature control, different grade plastics different temperature degree requirements, flow property and types above mixed combined material use has 不一样 情况发生, 应该 塑材 control in most flow value scope/range inner, this usually easy to, mold temperature control comparison complex 一, different formed parts 几何形状, dimensions, thick ratio/proportion different for cooling has requirements, mold temperature degree in very large degree upper control cooling time, therefore amount make mold maintain in can low temperature 状态, 以利于 shrink short injection cycle, improve/increase production efficiency, mold temperature degree 发生变化, that shrinkage rate has 变化, mold temperature maintain stability, dimensions degree stability, from anti formed parts deformation, gloss defect, cooling and other defect, make plastics physical properties most 佳状态, this also has debugging process, especially is more formed parts more complex 一. 　　2, pressure and gas adjustment control: 　　 injection pressure 恰当, clamping force 匹配应 in debugging mold to 确定, in mold type and type 芯 形 formed in gas and plastics generate gas must need from gas 槽排出 mold outer, gas 不畅会出现 short shot, generate 熔接痕 or 烧伤, this types formed defect has 时会间 or in 同一部位出现, formed parts 簿壁部 separation has thick in 时, mold temperature degree low 时就会出现 short shot, mold temperature degree high also 会出现烧伤 phenomenon, usually in 烧伤部位 also meanwhile 出现熔接痕, gas 槽往往会 by overlook, generally 都处于偏 small 状态, therefore usually lower need generate flash/burrs, gas deep degree amount deep, rear 部开设 dimensions relatively large gas 槽, through rear gas can speed mold outer, has especially need in upper gas 槽, is 一样, is 不出现 waste 边, is gas fast can very good to 效果就行. 　　3, injection molding parts formed parts dimensions 补充整形 control 　　 has parts outer and dimensions different, demolding rear temperature degree and pressure 变化, 会发生 different deformation warpage and other, this can as 辅助工装夹 tool adjustment, in formed parts rear and speed remedy measures, its cooling rear can relatively good positive, adjustment 效果. if in injection molding parts process upper ensure tube/pipe 理, that injection molding parts formed parts dimensions to non 常理想 control.