Study On Preparation And Properties Of Polyurethane Based Elastic Grinding Wheel

In the consumer industry,such as consumer electronics industry and household electrical appliance industry,the processing quality of the product shell is very important,and it is also an important embodiment of the competitiveness of the products.For example,the shell of electronic products is developing towards the direction of curved surface and new material.However,the existing technology and equipment used for processing the shell of consumer products,especially the curved surface shell,generally have low efficiency and low yield.In order to solve this problem,the industry and the academia actively explore new process methods and tools,in which the elastic grinding method,due to the elasticity of the processing process,can be well fitted to the surface,low requirements for equipment,suitable for curved surface grinding.The polyurethane elastic grinding wheel belongs to the elastic grinding tool.It has the advantages of low manufacturing cost,elastic grinding advantages,and can meet the processing needs of the industry.In this paper,the preparation technology and grinding performance of polyurethane elastic grinding wheel are studied comprehensively,including the technological formula of the polyurethane elastic grinding wheel,the influence of the formula on the performance of the grinding wheel,the stress simulation of the grinding zone in the elastic grinding wheel and the optimization of the grinding process parameters.The main contents are as follows:(1)The grinding mechanism in the machining of elastic grinding wheel is analyzed.First,it is determined that the contact situation of the elastic grinding wheel conforms to the three basic assumptions of the Hert contact theory.By using the Hert contact theory,the relationship diagram of the pressure distribution of the elastic grinding wheel in the grinding area is obtained.Then the difference between grinding and elastic grinding in the processing engineering is compared with the single abrasive particles.The three processes of abrasive cutting,namely,sliding,plow and cutting stage,are summarized.Finally,in order to analyze the material properties of the elastic grinding wheel,the superelastic constitutive model suitable for superelastic materials is summarized,which is the paving for the follow-up analysis of the elastic grinding wheel grinding area simulation.(2)The stress distribution of the polishing area of the elastic grinding wheel issimulated and analyzed.The factors that affect the stress distribution of the polishing area are simulated and analyzed according to the size of the wheel and the shape of the outer section of the grinding wheel.The general rule of the polishing plane is obtained,and the optimization is made.The parameters conducive to uniform stress distribution in the polishing area are obtained.(3)The preparation process of polyurethane elastic grinding wheel was studied.The advantages and disadvantages of different preparation schemes were analyzed and compared,and the performance of the main raw materials was compared.The effects of these parameters on the properties of the polyurethane based elastic grinding wheel were analyzed by changing the parameters of the foaming agent and the adding amount of the raw material.(4)The grinding process of aluminum alloy based on polyurethane based elastic grinding wheel was studied.The influence of abrasive grain size,feed speed,cutting depth and grinding wheel speed on the roughness of the surface and the material removal rate were studied.The results show that the grinding efficiency of the aluminum alloy can be effectively improved and the grinding quality can be ensured by the application of the elastic grinding wheel to the grinding of aluminum alloy.