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标题: 关于螺丝柱的问题 [打印本页]
作者: fan22zhang 时间: 2015-1-14 16:47
标题: 关于螺丝柱的问题
本帖最后由 fan22zhang 于 2016-10-12 10:53 编辑
使用的是1.6的自攻钉，螺柱外径3mm，内径1.2mm。
同一个产品上有六个这个规格的螺柱，但是有一个螺柱在攻螺钉时出现断裂情况（其他5个都没）。
材料为ABS+PC
这是什么情况？
有没有大神给分析一下啊。
作者: gxf810122 时间: 2015-1-14 17:04
1.司筒内径做1.3。
2.螺丝柱四周长加强骨位。
3.确认模厂有没有加水口料。正常单边20条只是撑的螺丝柱涨变形而已。
作者: fan22zhang 时间: 2015-1-14 17:12
感谢~螺柱用顶针做的，针直径1.26mm。
料是直接买的，具体情况不清楚。
作者: fan22zhang 时间: 2015-1-14 17:16
本帖最后由 fan22zhang 于 2016-10-12 10:54 编辑
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。
ABS+PC。使用的是2mm的自攻钉。
作者: yaowu 时间: 2015-1-14 18:37
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。
作者: aqi668899 时间: 2015-1-14 19:09
作者: dbtiantianjian 时间: 2015-1-14 22:08
yaowu 发表于 2015-1-14 18:37
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， ...
确实会出现
作者: yjy2015 时间: 2015-1-14 22:34
你的螺柱是3MM的直径，去掉1.2的螺丝孔两边只有0.9MM的厚度，如果螺丝批的力度在1.5KG左右就会将螺丝柱大裂开，我最近也遇到这样的问题，解决的方法是1.降低螺丝批的扭力，用1.2以下的力打试试，2.加大螺丝柱的厚度，或者用1.2的螺丝，都是降低对螺丝柱的压力，还有就是胶料是否加了很多水口料？这些都需要验证的。祝你好运！
作者: yjy2015 时间: 2015-1-14 22:36
希望能够帮到你。
作者: fan22zhang 时间: 2015-1-15 09:19
这个螺柱尺寸是在之前的产品模具中验证过没问题的呀。
这次就忽然有问题了，一直弄不明白啊。
期间也换了两次料试了下，都有同样的问题。
作者: wps1029 时间: 2015-1-15 15:40
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
作者: cailechang123 时间: 2015-1-16 09:56
看你所说的，螺丝柱的设计也是合理的
作者: loveyong0523 时间: 2015-1-16 10:58
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
作者: zf1688 时间: 2015-1-16 14:45
加骨位或加胶就可以了
作者: asd424500 时间: 2015-1-17 08:09
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
作者: hua5fei 时间: 2015-1-17 08:56
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）.
作者: foreverroc 时间: 2015-1-17 23:57
作者: zhy7498336 时间: 2015-1-19 18:52
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。
作者: yigedala 时间: 2015-1-20 10:15
过来学习下
作者: 小酷酷 时间: 2015-1-20 15:03
顶下~~
未收录
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作者: fan22zhang 时间: 2015-1-21 10:59
保守起见，单纯的为了保证固定的强度，就把内径做小了一点
作者: fan22zhang 时间: 2015-1-21 11:00
是啊，修模是最后要考虑的手段了。
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