| ZHU Yi-wei,YAN Qiu-sheng,TANG Biao,LU Jia-bin.Effect of Tool Surface State on Shear Surface Integrity of Electrical Steel Plate[J],48(11):159-169 |
| Effect of Tool Surface State on Shear Surface Integrity of Electrical Steel Plate |
| Received:July 31, 2019 Revised:November 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.11.016 |
| KeyWord:electrical steel plate shearing contact environment surface integrity finite element simulation |
| Author | Institution |
| ZHU Yi-wei |
School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou , China |
| YAN Qiu-sheng |
School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou , China |
| TANG Biao |
School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou , China |
| LU Jia-bin |
School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou , China |
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| Abstract: |
| The work aims to study the influence of tool surface roughness and lubrication conditions on the integrity of shear surface during precision shearing of electrical steel plate. The shearing tools with different surface roughness were used, 0.5 mm thick non-oriented electrical steel was sheared under dry shearing and lubrication, and the surface roughness of the shearing tool was measured with MahrXT20 roughness profiler. Kistler three-way force instrument was used to measure the three-way force during the shearing process, the Keyence Ultra Depth of Field Microscope was used to detect the cross-sectional shape and profile, and the Vickers microhardness tester was used to test the shear edge hardness distribution. The influence of the surface roughness of the shearing tool and the lubricant film on the contact area and friction of the tool-work surface was calculated with the finite element method. Under dry shearing conditions, the greater the surface roughness Ra of the shearing tool, the greater the shearing force, the greater the hardening of the shearing edge and the worse the integrity of the shearing surface. Under the lubrication condition, with the increase of the surface roughness Ra of the shearing tool, the shear surface integrity first became better and then deteriorated, and the work hardening and shearing force both decreased first and then increased. When the shearing tool surface roughness Ra was relatively small or large, it was difficult to improve the processing effect or even have a negative effect when the lubricant was added. Under the lubrication condition of the interface between the plate and the shearing tool, the optimum processing effect was obtained when the surface roughness of the shearing tool was Ra=0.2 μm. Compared with dry-cut condition, the height of the burnish zone and the surface integrity were increased by 16.9% and 4.3% respectively and the height of rollover, the relative depth of the hardened layer, Fy and Fz were reduced by 15.4%, 28.1%, 26.9% and 7.1%, respectively. With the increased surface roughness Ra of the shearing tool, the additional microscopic deformation of the workpiece material increases, resulting in deterioration of the shear surface integrity. When the shearing tool surface roughness is appropriate, the addition of lubricant can form a continuous oil film at the contact interface, which can significantly reduce the solid contact area and friction between the shearing tool and the plate, and improve the integrity of the shear surface. In actual production, the shearing tool wears gradually, resulting in increased surface roughness. Therefore, it is necessary to pay attention to the influence of the surface roughness of the shearing tool on the integrity of the shear surface, and its cooperation with the lubricating oil. |
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