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[求助] 关于螺丝柱的问题

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11
发表于 2015-1-15 15:40:47 | 只看该作者
个人感觉从两个方面入手:1.零件本身 ;a.让模具设计人员做个模流分析,看下应力集中位置;b.检查下与之配合的壳体5个螺丝柱位偏心的公差及组装的累积公差,分别装好5个样品,用刀子破开5个螺丝柱位置后去2次元投影看看,分别测下5个位置的同心度公差
如果上面两个问题排除了则从其他方面入手1.螺丝批的力度;2.材料的原料和水口配比;3.开裂柱子周围是否相较其他柱子有顶针,这点在模具顶出不平衡,注塑成型时柱子处有残留内应力也会存在这个问题;
如果以上都检查了不是问题所在,那就只有尝试加厚柱子厚度了
12
发表于 2015-1-16 09:56:20 | 只看该作者
看你所说的,螺丝柱的设计也是合理的
13
发表于 2015-1-16 10:58:50 | 只看该作者
fan22zhang 发表于 2015-1-14 17:16
另外还有个类似的。
帮忙看下啊~
圈出来的三个螺柱尺寸是外径3.3,有拔模,顶部3.2多,内径1.5mm。

怎么你的螺丝吃合量都做那么大呢?2.0的自攻螺丝塑胶孔做到1.6mm,你问的问题其实更之前那个问题查不多,前面大神回复啦
14
发表于 2015-1-16 14:45:27 | 只看该作者
加骨位或加胶就可以了
15
发表于 2015-1-17 08:09:18 | 只看该作者
标准螺丝是1.7的
1.6的是非标,
内径做1.3即可,检查爆裂的螺丝柱内径是否偏小
16
发表于 2015-1-17 08:56:54 | 只看该作者
我同样也遇到过此类问题,你从两个方面去入手
  
1.  电批扭力改小,
2.产品壁厚(圆柱加到3.6mm).
17
发表于 2015-1-17 23:57:12 | 只看该作者
18
发表于 2015-1-19 18:52:42 | 只看该作者

加几条骨位,就可以改善,螺丝柱开裂不光是壁厚,材料的问题,有时打螺丝打偏不,或者上下螺丝孔没有对准,也会开裂。
19
发表于 2015-1-20 10:15:36 | 只看该作者
过来学习下
20
发表于 2015-1-20 15:03:23 | 只看该作者
顶下~~
未收录
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