Abstract
HVOF(high velocity oxyfuel spraying) WC-Co high hardness coating material brings great challenge to the processing technologies. The coating material achieved by HVOF have low porosity、high bond strength、high microhardness and high wear resistance. In recent years the HOVF method obtained the rapid development, also have made great achievements. Excellent comprehensive performance makes its can only use diamond grinding wheel machining.There is only a little of research taked on this domain at home and abroad. In this paper, the experimental study on the grinding process of HVOF WC-10Co-4Cr coating with 45#
steel substrate is conducted. The mainresearch content was as follows:
1. The grinding force of the HOVF WC coating with different grinding parameters are measured by using a piezoelectric crystal dynamometer. 2. Optimize the method of temperature measurement using thermocouple. Based on the grinding temperature measured during grinding , the average temperature of the grinding zone and the coating - substrate faying face were calculated by the ANSYS 3. Analyze the effect of the different grinding parameters to the grinding quality by measure the surface roughness、surface microstructure and the subsurface damage. Research the removal mechanism of HOVF tungsten carbide coating. The results show that: the grinding force decreases with the increase of wheel speed while increases with the increases of table speed and grinding depth. The ground surface roughness improves with the increase of the wheel speed and worsen with the increases of table speed and grinding depth. Besides there is relationship between the surface roughness and the structure of the coating itself. With the help of finite element simulation, the temperature of the coating surface and coating - substrate faying face can be deduced. The temperature of the coating surface and coating - substrate faying face increases with the increase of grinding depth,first increases and then decreases with the increase of table speed.The morphology of surface and sub-surface of the HOVF WC coating with different grinding parameters were investigated by using scanning electron microscope and VHX-1000 three-dimensional microscope.It is found that the grinding surface is composed of trench marks formed by abrasives scratch and pits formed by brittle fracture. The damages of the subsurface include: cracks、micro broken、material Through a large number of experiments analyzed the impact of various processing parameters on the processing quality evaluation factors such as grinding force、surface
roughness、grinding temperature、surface damage and subsurface damage，the test results have a certain significance.
Key words: HVOF coating；grinding; grinding force；surface roughness；grindingtemperature；surface and subsurface damage
本站文章未经允许不得转载；如欲转载请注明出处，北京桑尧科技开发有限公司网址：http://en.sunspraying.com/
|
