Injection Molding Design Guidelines
Much has been written regarding design guidelines for injection molding. Yet, the design guidelines can be summed up in just a few design rules.
1U uniform wall thickness throughout the part. This will minimize sinking, warping, residual stress, and improve mold fill and cycle times.
▪Wall Section Considerations
▪Voids and Shrinkage
辩论赛二辩▪Warpage
2U generous radius at all corners. The inside corner radius should be a minimum of one material thickness.
▪Radius Limitations
3U the least thickness compliant with the process, material, or product design requirements. Using the least wall thickness for the process ensures rapid cooling, short cycle times, and minimum shot weight. All the result in the least possible part cost.
餐桌礼仪>花蛤怎么炒4Design parts to facilitate easy withdrawal from the mold by providing draft (taper) in the direction of mold opening or closing.
▪Draft and Texture
5U ribs or gusts to improve part stiffness in bending. This avoids the u of thick ction to achieve the same, thereby saving on part weight, material costs, and cycle time costs.
▪Rib Design
Uniform Walls
师德师风自查•Parts should be designed with a minimum wall thickness consistent with part
function and mold filling considerations. The thinner the wall the faster the part cools, and the cycle times are short, resulting in the lowest possible part costs.
Also, thinner parts weight less, which results in smaller amounts of the plastic ud per part which also results in lower part costs.零件的设计应以最小壁厚符合部分功能和充填型腔的考虑。越快越细越墙的部分，于是循环冷却的时间很短，导致零件成本最低。
同时，较薄的部分，它的结果必然是重量更少的塑料使用少量的每部分也导致了较低的部份成本。
The wall thickness of an injection-molded part generally range from 2 mm to 4 mm (0.080 inch to 0.160 inch). Thin wall injection molding can produce walls as thin as 0.5 mm (0.020 inch).墙的厚度一般范围从2”塑料部分毫米(0.080英寸到0.160英寸)。薄壁注塑模具可以生产墙壁薄如0.5毫米(0.020英寸)。四个字成语
The need for uniform walls需要统一的壁厚
•Thick ctions cool slower than thin ctions. The thin ction first solidifies, and the thick ction is still not fully solidified. As the thick ction cools, it shrinks and the material for the shrinkage comes only from the unsolidified areas, which are
connected, to the already solidified thin ction. 酷慢于厚壁处薄片。第一次的凝固薄片，浓烈的部分还没有完全凝固。为厚段冷却后，它收缩和材料的收缩是只能从unsolidified区域是相连的，已经凝固薄片。
•This builds stress near the boundary of the thin ction to thick ction. Since the thin ction does not yield becau it is solid, the thick ction (which is still liquid) must yield. Often this leads to warping or twisting. If this is vere enough, the part could even crack. 这个建立在边境附近应力的薄壁厚的部分。由于薄壁不屈服，因为它是固体，厚的部分(这仍然是流动的)必须屈服。这常常会导致扭曲或扭曲。如果这是严重的足够的，部分甚至开裂。
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Uniform wall thickness reduce/eliminate this problem. 均匀的壁厚度的减少或消除
这一问题。
•Uniform walled parts are easier to fill in the mold cavity, since the molten plastic does not face varying restrictions as it fills.坚固的部分是容易制服填写模具型腔，因为熔化塑胶没有面临不同的限制其填充。
What if you cannot have uniform walls, (due to design limitations) ?如果你不能拥有统一的墙壁,(由于设计的局限性)?生涯幻游
•When uniform walls are not possible, then the change in ction should be as gradual as possible. 当统一的墙壁是不可能的，那么改变部分应该是作为逐渐越好。
•Coring can help in making the wall ctions uniform, and eliminate the problems associated with non-uniform walls. 取心能帮助使墙面部分统一和消除非均匀壁相关的问题。
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•Warping problems can be reduced by building supporting features such as
gusts.翘曲的问题可以减少建筑配套功能，如gusts。
Voids and Shrinkage孔洞及收缩
Shrinkage is caud by intercting walls of non-uniform wall thickness. Examples of the are ribs, boss, and other projections of the nominal wall. If the projections have greater wall thickness, they will solidify slower. The region where they are attached to the nominal wall will shrink along with the projection, resulting in a sink in the nominal wall. 摘要缩松缺陷是引起非均匀壁厚壁的相交。其中一个例子是肋骨，老板，和其他预测的命名的墙。如果这些预测有更大的墙厚度不同，他们就会凝固速度较慢。他们的地方被纳入名义墙会收缩随着投影，导致在一个沉名义墙。
•Shrink can be minimized by maintaining rib thickness to 50 to 60% of the walls they are attached to. 收缩可以最小化维持肋厚度的60%至，在墙上。
•Boss located at corners can result in very thick walls causing sinks. Boss can be isolated using the techniques illustrated. 位于角落老板会导致很厚壁造成下沉。老板会被孤立使用技术做了说明。
Warpage翘曲
Thick ctions cool slower than thin ctions. The thin ction first solidifies, and the thick ction is still not fully solidified. As the thick ction cools, it shrinks and the material for the shrinkage comes only from the unsolidified areas, which are connected, to the already solidified thin ction. 酷慢于厚壁处薄片。第一次的凝固薄片，浓烈的部分还没有完全凝固。为厚段冷却后，它收缩和材料的收缩是只能从unsolidified区域是相连的，已经凝固薄片。
This builds stress near the boundary of the thin ction to thick ction. Since the thin ction does not yield becau it is solid, the thick ction (which is still liquid) must yield. Often this leads to
warping or twisting. If this is vere enough, the part could even crack.这个建立在边境附近应力的薄壁厚的部分。由于薄壁不屈服，因为它是固体，厚的部分(这仍然是流动的)必须屈服。这常常会导致扭曲或扭曲。如果这是严重的足够的，部分甚至开裂。
Other caus：其他原因:
•Warping can also be caud due to non-uniform mold temperatures or cooling rates. 翘曲也可以引起模具温度不均匀或冷却率。
•Non-uniform packing or pressure in the mold. 包装或非压力模具。
