粉末冶金零件结构的工艺性--qsf999的安全生产小屋

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粉末冶金零件结构的工艺性 | 2012-2-20 18:01:00

粉末冶金零件结构的工艺性

粉末冶金材料常用的成形方法是在刚性封闭模具中将金属粉末压缩成形，模具成本较高；由于粉末流动性较差，且又受到摩擦力的影响，压坯密度一般较低且分布不均匀，强度不高，薄壁、细长形和沿压制方向呈变截面的制品还难以成形。因此，采用压制成形的零件结构的设计应注意下列问题。
⑴ 尽量采用简单、对称的形状，避免截面变化过大以及窄槽、球面等，以利于制模和压实。
⑵ 避免局部薄壁，以便装粉压实和防止出现裂纹。
⑶ 避免侧壁上的沟槽和凹孔，以利于压实或减少余块。
⑷ 避免沿压制方向截面积渐增，以利于压实。各壁的交接处应采用圆角或倒角过渡，避免出现尖角，以利于压实及防止模具或压坯产生应力集中。

By:qsf999 | 阅读全文 | 回复(16) | 引用通告 | 编辑

Re:在漫画中识别身边的违章 | 2017-2-19 23:36:44

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Re:在漫画中识别身边的违章 | 2017-2-19 13:34:24

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Re:在漫画中识别身边的违章 | 2017-2-18 16:49:58

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Re:在漫画中识别身边的违章 | 2017-2-18 15:48:16

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Re:在漫画中识别身边的违章 | 2016-10-23 9:29:34

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Re:在漫画中识别身边的违章 | 2016-10-20 17:58:09

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Re:在漫画中识别身边的违章 | 2016-10-8 19:20:15

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原创 | 2016-9-30 15:53:00

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原创 | 2016-9-28 21:10:04

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原创 | 2016-9-6 21:35:42

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