风游2018 发表于 2018-9-27 10:01:34

M3-6H的螺纹孔小径可以做到2.459以下吗?

论坛的各位大神,请教大家一个问题:
       日前一个客户向我们提出,我们交付的产品上面的螺纹孔不符合要求,图纸要求M3-6H,客户的说按照国标要求,螺纹孔的小径应小于2.459,我们测量我们的产品,小径尺寸基本上是2.5~2.65这个范围,虽然用M3-6H的螺纹通止规检验可以通过,但是客户也不接受,认为是不符合标准的。

       我们目前的工艺是先冲孔,底孔直径2.78,然后在进行挤压丝攻,使用的丝锥规格是M3*0.5 RH4 HSS AP,材料是不锈钢,板厚1.0mm。我们试验了几件样品将底孔尺寸改小为2.73,攻牙之后的小径还是2.60,没有明显变小。

       在这里请教各位大神,有没有办法将攻牙后的小径尺寸显著改小,更改什么规格的丝锥吗??还是有其他方法??即使不能改到2.459以下,如果能改到2.50以下也是好的。

蜗牛1234 发表于 2018-9-27 10:19:51

用自攻丝锥不行吗?

Vincent_Hsu 发表于 2018-9-27 10:26:56

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M3 内螺纹孔小径应该介于2.459和2.599之间啊,怎么客户说小径应小于2.459啊?!!

1qaz1q 发表于 2018-9-27 10:46:40

风游2018 发表于 2018-9-27 13:10:24

1qaz1q 发表于 2018-9-27 10:46
看看能确定你要的参数

大神!您这是什么软件吗??是叫什么名字?我去下载一个

loveskycc 发表于 2018-9-27 16:13:45

你直接问客户嵌合率要求多少,65%是2.78的底孔。。。M3挤压丝锥,底孔最小是2.66,也就是百分百嵌合了,但是底孔越小攻丝的难度也越大,根据你的工艺,有两点你要确定,首先你冲孔后可以控制到2.78的底孔吗?其次你攻丝的设备是加工中心还是台钻?

陌上古道 发表于 2018-9-27 16:40:44

你让客户拿资料来说,M3*0.5螺纹底孔国标最小2.459~2.6,且他的是正公差0~0.006,你的底孔2.5~2.65之间。M3的通规可以过,凭什么不接收?

韩寒11 发表于 2018-9-27 19:27:26

让客户提供检具给你们,检测方法也他们提供,按照他们的要求做就是了

远祥 发表于 2018-9-27 20:24:44

这样的螺纹只能采用自攻螺丝了。

风游2018 发表于 2018-9-29 08:43:51

loveskycc 发表于 2018-9-27 16:13
你直接问客户嵌合率要求多少,65%是2.78的底孔。。。M3挤压丝锥,底孔最小是2.66,也就是百分百嵌合了,但 ...

感谢指导!

我们现在冲孔的底孔直径是2.78的,这个可以控制。攻牙使用的设备是台钻。

您认为如果我们将底孔改小为2.73或2.75,能不能减小小径的尺寸??
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查看完整版本: M3-6H的螺纹孔小径可以做到2.459以下吗?