| ZENG Rui,LIN Zhen-rong,WANG Chao,WANG Jian-wu.Heat Treatment and Surface Zinc Plating of 2011-Snow Remover Rolling Brush Welding Gear[J],45(4):189-192,207 |
| Heat Treatment and Surface Zinc Plating of 2011-Snow Remover Rolling Brush Welding Gear |
| Received:February 02, 2016 Revised:April 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.04.031 |
| KeyWord:welding gear heat treatment zinc plating coating quality density bead welding transition layer |
| Author | Institution |
| ZENG Rui |
1. College of Field Engineering, PLA University of Science & Technology, Nanjing , China;2. Department of Airfield Engineering, Air Force Logistics College, Xuzhou , China |
| LIN Zhen-rong |
College of Field Engineering, PLA University of Science & Technology, Nanjing , China |
| WANG Chao |
College of Field Engineering, PLA University of Science & Technology, Nanjing , China |
| WANG Jian-wu |
College of Field Engineering, PLA University of Science & Technology, Nanjing , China |
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| Abstract: |
| Objective To improve the comprehensive mechanical properties and zinc coating qualities of 2011-snow remover rolling brush welding gear. Methods Before Heat Treatment, the 0. 4 mm Grinding length was reserved and the hardness was quenched and tempered to 230 ~270HBW. After welding, the heat stress was eliminated in the well type furnace at once by fast heating at 900 ℃ in furnace, quenching at 860 ℃, and tempering in time. The electroplating process was divided into five steps, pretreatment, activation, electroplating, passivation and drying. The new Zinc plating solution was used to electroplate. Results After quenched-tempered heat treatment, the weld area structure of Welding Gear was mainly composed of small and uniform tempered sorbite, which led to the excellent and stable mechanical properties, and the softening,embrittlement,and hardening of the HAZ zone were avoided. The gears which were processed and manufactured by means of pre-stack low carbon steel showed the best comprehensive mechanical performance and were tested to be qualified. The main component of the coating was Zn, and there was a small part of Fe. The mass fraction of Zn increased along the base metal to the coating, and Fe showed the opposite trend. The thickness of the plating layer was about 6 ~ 8 μm,and the zinc coating was closely attached to the gear. The coating showed no roughness, foaming, cracks, porosity or local uncoated situations. Conclusion The minimum deformation heat treatment process was used for gear welding, which ensured the dimensional accuracy, reduced the processing difficulty, and was conducive to the production of the workpieces. The mechanical performances of weld area were significantly improved by the process of bead welding transition layer. The national standard test showed that the electroplated coating had uniform thickness, reasonable distribution, good density, adhesion and corrosion resistance. The zinc plating solution and electroplating process of this paper had a great value of popularization and application. |
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