|
| Failure Analysis for Top Fracture of Camshaft |
| Received:November 21, 2019 Revised:January 17, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.08.020 |
| KeyWord:camshaft bolt fracture acute angle effect induction hardening |
| Author | Institution |
| XIN Yan-jun |
State Key Laboratory of Engine Reliability, Weifang , China;Weichai Power Co., Ltd, Weifang , China |
| WANG Chao |
Weichai Power Weifang Casting & Forging Co., Ltd, Weifang , China |
| Huang，Jun |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| JIANG Ai-long |
State Key Laboratory of Engine Reliability, Weifang , China;Weichai Power Co., Ltd, Weifang , China |
| WANG Fu-xiang |
Weichai Power Co., Ltd, Weifang , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to study the causes for failure of engine camshaft and bolt. The failure behavior of the camshaft and bolt was investigated based on analysis and test of chemical composition, hardness, microstructure, and fracture morphology, etc. to deduce the part leading to the whole failure process, and analyze the cause of the failure. There was no obvious abnormity in microstructure, surface and center hardness. The fracture surface had obvious characteristics of fatigue crack and cracks originated in the bolt hole wall of the camshaft, namely the interface between induction hardening and non-induction hardening during the heat treatment of camshaft. The bolt hole on the top of camshaft generates acute angle effect during induction hardening, leading to the hardening of bolt hole wall and increasing material brittleness, thus the top of the camshaft has fatigue fracture after long-term use, causing the fracture of joint bolt. |
| Close |
|
|
|