Effect of grinding-induced cyclic heating on the hardened layer generation in the plunge grinding of a cylindrical component |
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| Affiliation: | 1. School of Mechanical and Manufacturing Engineering, The University of New South Wales, NSW 2052, Australia;2. Baoshan Iron & Steel Co., Ltd., Shanghai 200941, China;1. University of São Paulo, Engineering School at São Carlos, 400 Trabalhador São-Carlense Avenue, São Carlos, SP 13.566-590, Brazil;2. Federal University of Santa Catarina, 406 Presidente Prudente de Moraes Street, Joinville, SC 89.218-000, Brazil;1. Department of Mechanical Engineering, KU Leuven, Celestijnenlaan 300, Bus 2420, 3001 Heverlee, Belgium;2. National Engineering Research Center for High Efficiency Grinding, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China;3. College of Electromechanical Engineering, Hunan University of Science Technology, Xiangtan 411201, China;1. Surface Engineering Laboratory, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China;2. Key Laboratory for Precision and Non-traditional Machining of the Ministry of Education, Dalian University of Technology, Dalian 116024, China;1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;2. Tianjin Navigation Instruments Research Institute, Tianjin 300131, China;1. Institute of Grinding and Precision Technology (KSF), Furtwangen University of Applied Sciences, Jakob-Kienzle-Strasse 17, 78054 Schwenningen, Baden-Württemberg, Germany;2. Center of Excellence in Design, Robotics and Automation, School of Mechanical Engineering, Sharif University of Technology, 1458889694 Tehran, Iran;1. School of Automotive Engineering, Hubei Key Laboratory of Advanced Technology of Automotive Parts, Wuhan University of Technology, Wuhan 430070, China;2. State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;3. College of Mechanical Engineering, Donghua University, Shanghai 201620, China |
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| Abstract: | This paper discusses the effects of the grinding-induced cyclic heating on the properties of the hardened layer in a plunge cylindrical grinding process on the high strength steel EN26. It was found that a multi-pass grinding brings about a uniform and continuous hardened layer along the circumference of the cylindrical workpiece. An increase of the number of grinding passes, leads to a thicker layer of hardening, a larger compressive residual stress and a deeper plastic deformation zone. Within the plastic deformation zone, the martensitic grains are refined by the thermo-mechanical loading, giving rise to a hardness of 12.5% higher than that from a conventional martensitic transformation. The coupled effects of heat accumulation and wheel wear in the multi-pass grinding are the main causes for the thickening of the hardened layer. A too small infeed per workpiece revolution would result in insufficient grinding heat, and in turn, bring about an undesirable tempered hardened layer and a reduction of its hardness. |
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| Keywords: | Cylindrical grinding-hardening Plastic deformation Grinding wheel wear |
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