Shanghai Daoqin Plastics Co., Ltd.

一, dimensions, degree and surface coarse degree 〈一〉 dimensions dimensions main/primary meet/satisfy use requirements and requirements, meanwhile need 考虑 injection molding parts mold processing manufacturing, equipment property can, also need plastics flow property. 〈二〉精 degree effect/influence factors very more, has injection molding parts mold manufacturing degree, plastics formed and process conditions and other. 〈三〉 surface coarse degree injection molding parts mold surface coarse degree 决定, generally injection molding parts mold surface coarse ratio products need low grade, injection molding parts mold surface need 进引研 abrasion light, products requirements injection molding parts mold type and type surface light degree need ra 〈 0.2 um parts upper 无公差 requirements still dimensions, generally using/adopting standards in 8 grade, for type dimensions can positive 公差, type parts dimensions can negative 出差. in dimensions can positive negative 公差, combined separation dimensions need high non combined separation dimensions. 二, demolding degree due to parts in mold cavity inner generate cooling shrinkage phenomenon, make parts mold cavity in type and type in 凸出部 separation, make parts 取出困 difficult, strong/high 行取出会导至塑 parts surface scratch separation, 拉毛, is demolding, parts design must and demolding （ and 轴芯） direction inner, outer surface, design demolding degree, generally 1°——1°30`. generally type degree need ratio type large, type long degree and type deep degree large, degree decrease small. 三, thick according to parts use requirements （ strong/high degree, rigid degree ） and products structure features and injection molding parts mold molding process requirements 而定 壁 thick small, strong/high degree and rigid degree 不足, plastics filling difficult thick large, increase cooling time, reduce production rate, generate bubbles, shrink and other. requirements thick can can uniform 一致, due to cooling and solid speed degree 不一样 easy generate internal stress, 引起塑 parts deformation and cracking. 四, add strong/high design 原则: 〈一〉 in add strong/high need low outer 壁 0.5 mm above, make 支承面 easy 于平直. 〈二〉应避免 or decrease small plastics local poly 积. 〈三〉筋 排例 need in type inner flow direction. 五, 支承面 塑 parts generally 不以整 平面 as is 支承面, 而取而代之以边 frame, as 支承面. 六, requirements parts anti has 转角处都 need 以圆角（圆弧） 渡, 因尖角容 easy force in. parts has 圆角, has plastics flow and parts ejection, parts appearance good, has injection molding parts mold strong/high degree and lifespan. 七, 孔（槽） 塑 parts types molding processing methods: （1）模 type 直接模塑出. （2）模塑 formed again 钻孔通. （3）塑 parts molding rear again 钻孔. 先模塑出 shallow good. 1, 模塑通孔 requirements ratio （ long degree and ratio ） need small, 当孔径〈1.5mm, due to easy bending 折断, 不适于模塑 模塑 type 芯 三 types methods. 2, deep degree: h 〈 （3—5）d d〈 1.5时, h 〈 3d 3, 异形孔（槽） design parts has or 凹槽, need active block or machine 构"平行射 formed 原则"确定塑 parts 侧孔（槽） is combined demolding. thermoplastic property plastics in soft has elastic property, polyethylene (PE), polypropylene (PP), polyoxymethylene (POM) products, inner and outer shallow can strong/high made demolding. 八, 螺纹 塑 parts in can use molding 出, or methods obtain usually or force large, need using/adopting metal 螺纹嵌 parts molding. 九, parts is increase plastics products overall or certain 一部位 strong/high degree and rigid degree, meet/satisfy use requirements, in parts inner metal parts. due to or certain need, plastics products surface has 文字图案. 1, 标志 2, 凹凸纹: 如 手, 旋钮, products solid 边, increase scratch force, 凹凸纹 need formed 直纹, 以便于 demolding. 3, 花纹: 凹凸纹, leather 纹, 桔皮纹, 纹浪纹, 点格纹, 菱形纹. processing methods: electrical processing, chemical abrasion 蚀, cold pressure.