注塑模具设计指导--外國工程師傳授的design資料.doc
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1、外國工程師傳授的design資料,供大家享受。9s0l#ffb$Z KHInjection Molding Design Guidelines CAD/CAM/CAE综合资讯网站论坛i3xxIoM注塑模具设计指导0MBbt5L www.iCAu1mMuch has been written regarding design guidelines for injection molding. Yet, the design guidelines can be summed up in just a few design rules.已经有许多关于设计注塑模具的书了,但是设计准则可以被概括以下几点
2、:U)J9L7CAD,CAE,CAM,ICAX,idesign,模具,设计,招聘,培训iCAx开思论坛9m$|h9VAhUse uniform wall thicknesses throughout the part. This will minimize sinking, warping, residual stresses, and improve mold fill and cycle times. 1. 零件整体壁厚保持均匀.这样可以最小化缩坑,翘曲,强度减小,模具填充和循环时间.2. n?dH%3dI,Use generous radius at all corners. The i
3、nside corner radius should be a minimum of one material thickness. 2.在转角处大量采用圆角.圆角内部最小半径为一个壁厚.(r8rY5b$J Ywww.iCA9J1S,n;WT unvx(5VUse the least thickness compliant with the process, material, or product design requirements. Using the least wall thickness for the process ensures rapid cooling, short c
4、ycle times, and minimum shot weight. All these result in the least possible part cost. www.iCA3G+d &W3.根据工艺,材料,产品设计需求.采用最小壁厚.最小壁厚的应用可以确保快速的冷却,短循环时间和减少喷射重量.所有这些最终达到最小的产品成本.2u4H8D(t:PV ZpeCAD,CAE,CAM,ICAX,idesign,模具,设计,招聘,培训Design parts to facilitate easy withdrawal from the mold by providing draft (t
5、aper) in the direction of mold opening or closing. CAD/CAM/CAE综合资讯网站论坛4l6Z7v.V2jQ0G%4.在模具开合方向设置拔模角便于设备的运做.*P:r(Z yUse ribs or gussets to improve part stiffness in bending. This avoids the use of thick section to achieve the same, thereby saving on part weight, material costs, and cycle time costs.5.
6、为了提高产品强度抵抗弯曲应该加筋或肋.避免用厚的结构达到同样的效果,以此减少了产品重量,材料成本,循环时间成本.The use of ribs iCAx开思论坛8o.y+p-p t*C筋的应用J9x4LbP#HRibs increase the bending stiffness of a part. Without ribs, the thickness has to be increased to increase the bending stiffness. Adding ribs increases the moment of inertia, which increases the
7、bending stiffness. Bending stiffness = E (Youngs Modulus) x I (Moment of Inertia) 如果没有筋来增加强度,厚度就必须增加(费话一堆).加强筋增加了转动惯量!y%V-&dEgZswww.iCAl)OeCVCThe rib thickness should be less than the wall thickness-to keep sinking to a minimum. The thickness ranges from 40 to 60 % of the material thickness. In addi
8、tion, the rib should be attached to the base with generous radiusing at the corners. 筋的厚度要单独的筋,为了防止在反面产生缩坑,尽量出去交叉中心的材料.v,3TIZ7SeP CAD/CAM/CAE综合资讯网站论坛W 9J&q3r+CW4C9W&P+|%*X9nwww.iCAThe height of the rib should be limited to less than 3 x thickness. It is better to have multiple ribs to increase the b
9、ending stiffness than one high rib. EKqoL|/ 筋的高度自锁角.(记住公式就可以了)_&i,i_:P&i mHoLCiCAx开思论坛!P2_t2U!N1R;z2f1Bwww.iCAwhere is the coefficient of friction which ranges from 0.3 to 0.6 for most plastics. /u 摩擦系数就不说了.This computes to angles ranging from 73 for low coefficient of friction plastics to 59 for hi
10、gh coefficient of friction plastics. 高的摩擦系数表面的自锁角为59,小的为73If this angle is exceeded then the snaps will not pull apart unless the snap beam is deflected by some other means such as a release tool. (本段大意就是要大于自锁角)h9qV8l!l(k&pm3!This property can be used to advantage depending on the objective of using
11、 the snaps. If the snaps are to be used in the factory for assembly only (never to be disassembled by the end user), then the ramp angle the self-locking angle should be exceeded. If the user is expected to disassemble (to change batteries in a toy for example), then the angle should not be exceeded
12、. 如果不要拆卸就设计自锁角,要是方便以后拆就自锁角。 Tooling for snaps is often expensive and long lead time due to 7fk4+Gn!X/MMFICAD,CAE,CAM,ICAX,idesign,模具,设计,招聘,培训/mUjmz(mUCCAD,CAE,CAM,ICAX,idesign,模具,设计,招聘,培训-The iterations required achieving the proper fit in terms of over travel. The amount of over travel is a design
13、issue. This will control how easy it is to assemble, and how much the mated parts can rattle in assembly. This rattle can be minimized by reducing the over travel or designing in a preload to use the plastics elastic properties. However, plastics tend to creep under load, so preloading is to be avoi
14、ded unless there is no other option.CAD,CAE,CAM,IOften, side action tooling (cam actuated) is required. This increases the mold costs and lead times.Cam actuated tooling can be avoided if bypass coring can be used that results in an opening in the part to allow the coring to form the step.;Pg4!p:_6h
15、i6xwww.iCA大概就是说在模具设计时卡扣,要考虑用側抽,但是这样一来又会增加成本。所以尽量不用。(本人对模具术语不熟)Zo%kh2Z Some common problems of using snaps:mP1%VB4KlCAD,CAE,CAM,ICAX,idesign,模具,设计,招聘,培训6m/I_c,!2Y-Too high a deflection causing plastic deformation (set) of the latch (the moving member). Care has to be taken that the latch does not tak
16、e a set. Otherwise, the amount of latch engagement could reduce, reducing the force to disassemble. If the set is bad enough the engagement might even fail.大体就是说卡扣对模具公差要求高。很容易失效。eC4A9b V9?D f2n V7 CAD/CAM/CAE综合资讯网站论坛-The moving arm could break at the pivot point due to too high a bending stress. Thi
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