| ZHANG Hui-ping,ZHANG Xiao-lei,ZHANG Hong-xia,REN Yi,LIU Guo-liang.Surface Quality of High-speed Turning 300M Ultrahigh Strength Steel[J],45(2):181-187 |
| Surface Quality of High-speed Turning 300M Ultrahigh Strength Steel |
| Received:December 01, 2015 Revised:February 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.02.029 |
| KeyWord:300M ultrahigh strength steel surface hardening residual stress hardness surface roughness prediction model |
| Author | Institution |
| ZHANG Hui-ping |
School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin , China |
| ZHANG Xiao-lei |
School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin , China |
| ZHANG Hong-xia |
School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin , China |
| REN Yi |
School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin , China |
| LIU Guo-liang |
School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin , China |
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| Abstract: |
| Objective To study the influence of cutting parameters on the processed surface quality of 300M ultrahigh strength steel. Methods Carbide tool was selected for the turning processing of 300M ultrahigh strength steel, then to study the influence of cutting parameters on surface hardening ,residual stress and surface roughness. HXD-1000 micro-hardness measuring instrument, X-ray stress test system and the surface roughness measuring instrument TR240 were used for measuring and analyzing the experimental process. Through single factor experiment, the primary and secondary factors affecting surface roughness were studied. Through orthogonal experiment, with feed f, cutting speed v, tip arc radius rε, turning back ap as variables, the forecast model of surface roughness was established. Results When the cutting parameters were turning back ap = 0. 2 mm, cutting speed v = 60 ~ 120 m / min, feed f = 0. 1 ~ 0. 25 mm / r, after machining, the Vickers hardness of 300 M steel changed in the range of 467HV ~ 550HV. When the cutting speed increased from 60 m / min to 120 m / min, the surface residual compressive stress increased from -59. 13 MPa to 257. 33 MPa, the subsurface residual compressive stress increased from -147. 46 MPa to -422. 65 MPa, and the deepest affected layer of workpiece materials was about 50 microns. Conclusion With increasing feeding and cutting speed, the surface hardness decreased and the farther from the surface layer, the lower the hardness until reaching the hardness of the matrix. The main influencing factor of surface roughness was feeding, followed by the tip arc radius and cutting speed, while the depth of cut had the minimal influence on surface roughness. The surface roughness prediction model established in this paper passed the experimental verification, and had very high machining accuracy. |
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