Perforation Head Such As Plasma Spraying Process The Temperature Field And Stress Field Finite Element Analysis

Piercing plug is one of the key tools in the production of seamless steel tube, of which consumption is the biggest. The quality and the service life of the piercing plug have great impact on quality and production efficiency of seamless steel tube directly. The surface of piercing plug is modified so as to enhancing the surface hardness and wearing resistance and oxidation resistance in order to extend the plug service life and to reduce unnecessary loss. Plasma spraying can combines the characteristic of metal substrate with the Feature of coating, and playing the comprehensive advantages of two types of material, to get a good composite structure. This paper adopt the metal-ceramic as spraying materials of piercing plug to get the temperature and thermal stress filed during spraying process .Finite element analysis software ANSYS is applied to simulate the process of spraying and cooling process of piercing plug. The real spraying and deposition process is simulated through micro-length by micro-length and micro-thick coating by micro-thick coating spraying. With ceramic being the coating material, the distribution of the temperature and stress field during continuous spraying are obtained. At the same time, In order to get a high-quality composite coating, changing the temperature of matrix and the material of coatings in the calculation process, analysis the temperature and thermal stress filed in different conditions.The results shows that With WC powder being the coating material and temperature of matrix being room temperature, the heat-affected segment expands, leading to the increase of the maximum temperature of last coating due to the heat accumulation, with the spraying going on. The stress created in the area around coating which is being spraying in the spraying process. The stress diminishes when spraying ending. 800s after the spraying process and when the plug cools to the room temperature, the maximum stress occurs at the conjunction between the nose-shaped part and the middle part. In the case of spraying after preheat the plug to 200℃, the temperature of coating increased significantly and thermal stress decreased. Residual stress decrease greatly, when the plug cools to the room temperature by 1800s. The maximum stress occurs at the conjunction between the nose-shaped part and the middle part. With WC powder being the coating material and temperature of matrix being room temperature, the temperature and stress filed is same as case that the WC being the coating material.