Study On Process Of Magnetic Abrasive Grains With Electroless Composite Plating Method

As a new kind of technology of finishing machining, magnetic abrasive finishing (MAF) can be used in multiple processing field as it has a lot of advantages, such as the flexible manufacturing, the higher machining surface quality, the lower cost of equipment requirements, etc. Magnetic abrasive grain is the key element of MAF, whose performance determines the machining quality, efficiency and the processing cost. But as the existence of difficulties in preparing the high performance and low cost of magnetic abrasive, it is currently difficult to promote this technology in industrial applications.According to the current situation of processing, compared with other preparation methods of magnetic abrasive and combined with the principle of composite plating, this paper put forward the method of electroless composite plating. After that the author carried out the study from some aspects to prove its feasibility, including the theory of electroless composite plating, the optimization of process parameters and the machining effect. The main research results in this paper are as follows:(1) Based on the features of MAF, the advantages and disadvantages of traditional methods of preparation, this paper put forward the method of electroless composite plating and the capability requirement of magnetic abrasive grains.(2) To enhance the bonding force between the coating and the substrate as well as the holding power of the abrasive particle phase, the plating solution formula was optimized, with deposition rate and microhardness as the evaluation criterion.(3) The project of composite barrel plating and the equipment needed were proposed, meanwhile the process parameters of composite barrel plating were optimized. To carry out the composite plating of massive small particles, the traditional barrel plating method was improved and the process parameters such as speed of rolling barrel, concentration of abrasive grains, magnetic stirring speed were optimized. Experimental results show that the uniform distribution of the diamond abrasive grains on the magnetic abrasive can be obtained with reasonable rolling barrel process parameters.(4) To study the law of MAF process parameters such as density of magnetic field, gap of machining, relative speed, plentiful experiments were made, with surface roughness and material removal rate as the evaluation criterion.