Abstract
In order to achieve high-quality polishing of M300 mold steel curved surface, an elastic abrasive is introduced in this paper, and its polishing parameters are optimized so that the mirror roughness can be achieved. Based on the Preston equation and Hertz contact theory, the theoretical material removal equation for surface polishing of elastic abrasives is obtained, and the polishing parameters to be optimized are as follows: particle size S, rotational speed Wt, cutting depth Ap, and feed speed Vf. The Taguchi method is applied to design the orthogonal experiment with four factors and three levels. The influence degree of various factors on the roughness of the polished surface and the combination of parameters to be optimized were obtained by the range analysis method. The particle swarm optimization algorithm optimizes the BP neural network algorithm (PSO-BP), which is used to optimize the polishing parameters. The results show that the rotational speed has the greatest influence on the roughness, the influence degree of abrasive particle size is greater than that of feed speed, and the influence of cutting depth is the least. The optimum parameters are as follows: particle size S 1200#, rotational speed Wt 4500rpm, cutting depth Ap 0.25mm, and feed speed Vf 0.8mm/min. The roughness of the surface polishing with optimum parameters is reduced to 0.021 μm.
Highlights
Due to its high Cr (16%) content, M300 mold steel has a good corrosion resistance and a wear resistance and has strong resistance to the erosion of general chemicals such as industrial hydrochloric acid [1]
Compared with the minRa parameter combination, the roughness is reduced significantly, and the surface quality is improved obviously, which mean that the parameter optimization method used is feasible
Compared with the polishing of free and consolidated abrasive hard grinding wheels, a silicon carbide abrasive as well as a silicone rubber based elastic abrasive is cheaper and has a better profile when polishing the curved surface of the M300 mold steel
Summary
Due to its high Cr (16%) content, M300 mold steel has a good corrosion resistance and a wear resistance and has strong resistance to the erosion of general chemicals such as industrial hydrochloric acid [1]. It is often used in the mold for various kinds of plastics, such as transparent plastics and camera lenses. It is beneficial to improve the quality of curved surface polishing using an elastic abrasive. For elastic abrasive polishing of M300 mold steel, there is still no complete study about parameter optimization. In order to realize high-quality polishing of M300 mold steel curved surface, based on the Preston equation and Hertz contact theory, the polishing mechanism of the elastic abrasive is studied in this paper [8]. The surface quality, which is polished under the conditions of optimal parameter combination, is verified by experiments
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