This study performs experimental investigation into the application of abrasive jet polishing (AJP) to the surface finishing of electrical-discharge-machined SKD61 mold steel workpieces. The results indicate that the AJP processing conditions which optimize the surface quality of the SKD61 workpiece when polishing using #2000SiC abrasives are as follows: an abrasive material to additive ratio of 1:2, an impact angle of 30°, a gas pressure of 4 kg/cm2 (0.4 MPa), a nozzle-to-workpiece height of 10 mm, a platform rotational velocity of 200 rpm, and a platform travel speed of 150 mm/s. Under these processing conditions, a polishing time of 20 min is sufficient to reduce the surface roughness from an initial value of Ra = 1.7 μm to a final value of Ra = 0.27 μm, corresponding to an improvement of 84.12%. The experimental results demonstrate that the maximum attainable improvement in the surface quality of the polished workpiece is limited by a surface-hardening effect caused by the ball-impact phenomenon and the embedment of #2000SiC fragments in the workpiece surface.
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机译：这项研究进行了实验研究，以研究磨料喷射抛光（AJP）在放电加工的SKD61模具钢工件的表面精加工中的应用。结果表明，使用＃2000SiC磨料进行抛光时，可优化SKD61工件表面质量的AJP加工条件如下：磨料与添加剂的比例为1：2，冲击角为30°，气压为4 kg / cm 2 （0.4 MPa），喷嘴到工件的高度为10 mm，平台旋转速度为200 rpm，平台移动速度为150 mm / s。在这些加工条件下，20分钟的抛光时间足以将表面粗糙度从Ra = 1.7μm的初始值降低到Ra = 0.27μm的最终值，相当于提高了84.12％。实验结果表明，抛光工件的表面质量可获得的最大改善受到球撞击现象和＃2000SiC碎片在工件表面的嵌入所引起的表面硬化作用的限制。
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