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| 某药模底座失效分析 |
| Failure Analysis of Punch for Pressing Powder Block |
| Received:May 27, 2012 Revised:December 01, 2012 |
| DOI：10.3969/j.issn.1674-6457.2013.01.014 |
| 中文关键词: 淬火马氏体 配合间隙 应力集中 |
| 英文关键词: quenching martensite fit clearance stress concentration |
| 基金项目: |
| Author Name | Affiliation | | QIN Hui-chang | CNGC Shandong Special Machinery Group Co. , Ltd. , Zibo 255201, China | | JIA Bo | CNGC Shandong Special Machinery Group Co. , Ltd. , Zibo 255201, China | | WANG Chuan-zheng | CNGC Shandong Special Machinery Group Co. , Ltd. , Zibo 255201, China | | ZHAO Xing-jian | CNGC Shandong Special Machinery Group Co. , Ltd. , Zibo 255201, China | | LI Zong-jiang | CNGC Shandong Special Machinery Group Co. , Ltd. , Zibo 255201, China | | ZHANG Cong-bo | CNGC Shandong Special Machinery Group Co. , Ltd. , Zibo 255201, China | | YANG Zhi-chuan | CNGC Shandong Special Machinery Group Co. , Ltd. , Zibo 255201, China |
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| 中文摘要: |
| 通过对 2 号药模底座的化学成分分析、断口宏微观形貌观察、金相组织检测、硬度检测及药模底与压药冲子的配合间隙检查,得出药模底座断裂的性质为脆性断裂;药模底座 R 角交接处粗大的加工刀痕,R 角过渡不圆滑是药模底座断裂的主要原因;磨削不当产生了二次淬火马氏体,使得药模底座底部的组织脆性增加、应力增强,是药模底座断裂的重要原因;材质不良对药模底座的断裂也有重要影响;压药冲子与药模底座之间的配合间隙过小,导致压药冲子与药模底座间产生较大应力集中,也是药模底座断裂不可忽视的因素。 |
| 英文摘要: |
| A conclusion was drawn that the fracture of No. 2 punch for pressing powder block was a low-circle high stress fatigue one after the chemical analysis,macro and micro observation of the fracture surface, metallographic structure inspection,hardness testing as well as the fit clearance inspection between the mold and the punch. Another reason for the fracture was the rough machining on rounding of the punch. Besides,the fit clearance between the punch and the mold was so small that the stress concentration produced by it was too big to bear for the punch. |
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