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| Crack analysis of PM engine bearing pedestal |
| DING Xia1，WU Zengqiang2 |
| 1 School of Mechanical and Automotive Engineering, Shanghai University Of Engineering Science, Shanghai
201620, China; 2Shanghai Automotive Powder Metallurgy Co., Ltd., Shanghai 201908, China） |
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Abstract This paper analyzed and studied the chemical composition, density, hardness, metallography and fracture
morphology of the cracks, and discussed the rationality of finishing die and finishing process. The results show
that the unreasonable design of finishing die is the main reason for the surface crack of bearing pedestal. After the
optimization design of finishing die, the test results show that all indexes of the product meet the requirements, the
improvement effect is obvious.
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Received: 12 March 2021
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2021, Vol. 31 
