| REN De-liang,LIN Qi,LI Ting,QI Hai-bo.Laser Cladding Repair Technology and Path of Cold-worked Dies[J],47(3):54-60 |
| Laser Cladding Repair Technology and Path of Cold-worked Dies |
| Received:September 11, 2017 Revised:March 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.03.009 |
| KeyWord:cold-worked dies laser cladding camber repair path |
| Author | Institution |
| REN De-liang |
School of Electronic Information Engineering, Hebei University, Baoding , China |
| LIN Qi |
School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang , China |
| LI Ting |
School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang , China |
| QI Hai-bo |
Hebei Province Key Laboratory of Traffic Engineering Materials, Shijiazhuang , China |
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| Abstract: |
| Cold-worked dies have a high rejection rate due to wear susceptibility at high pressure and high impact force, and inefficient and low-level automation of traditional repair methods. The work aims to obtain a repair layer exhibiting excellent service performance by repairing the dies by adopting laser cladding technology. A cladding layer was obtained by combining laser cladding technology which featured in high repair quality and rapid repair rate with robot technology which featured in high spatial freedom and flexible operation. Quality of the cladding layer was observed based on microstructure observation, hardness analysis as well as friction and wear test. Optimum process parameters were as follows: laser power of 1500 W, scanning speed of 2 mm/s, carrier gas of 6 L/min, powder feeder speed of 10 r/min, and overlapping ratio of 1/2. Hardness of the cladding layer was 350~430HV, which was well above that of the substrate. In single layer experiments, the best path is scanning zigzag along short edge of camber from the botttom up. In multi-pass multilayer cladding experiments, more effective method is to shift starting points of the second layer by 1.5 mm compared to that of the first layer. The microstructure analysis shows that interface between the cladding layer and the substrate exhibites metallurgical bonding, the cladding layer mainly consists of dense dendrite, and wear resistance of cladding layer is superior to that of the substrate. |
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