Process Test Research On Stainless Steel In Ultra-High Speed Grinding

Stainless steel has many excellent physical and mechanical properties, such as corrosion resistance, formability, compatibility and strong toughness at a wide temperature range, those advantages make it get a great application in the heavy industry and light industry. However, it put forward the challenge to the traditional processing method for the stainless steel of well physical and mechanical properties. Stainless steel known as the traditional difficult grinding materials for its nature of hard cutting off, but grinding process is often selected for the final machining in the production of components because of its ability to obtain a high surface quality with fine tolerance and roughness, so it often exists the following questions in the grinding process:1) the grinding wheel easily be blocked;2) materials easily be burned;3) materials be work-hardening seriously;4) the work-piece often be out of shape. These questions make the stainless steel material excellent industrial properties cannot to be wide application in industry, so the study of high efficiency, high quality and low cost of stainless steel materials processing method and technique is seemed particularly important. Ultrahigh speed grinding technology highly integrating the modern new materials’ technology, manufacturing technology, controlling technology, testing technology and experiment technology, it is the perfect combination of high quality and high efficiency, it also is the revolutionary transformation in grinding process. The advantages of ultrahigh speed grinding is that, it could not only greatly improve the precision of the work-piece, reduce materials surface roughness, but also greatly improve the efficiency of grinding process, prolong the life of grinding wheel and improved the quality of materials’ surface, make it come ture for grinding hard and brittle materials in ductility style, such as plastic materials also have a good grinding performance.In this paper, the typical application materials of austenitic stainless steel is be used to carried on the ultrahigh speed grinding tests, then discussed the physical properties of materials and different grinding parameters effects to the grinding surface and surface features grinding force, grinding energy, grinding temperature and the influence of the grinding wheel adhesion state. The researches specially analyze the heat flux and grinding temperature how to affect the materials’surface quality and he grinding wheel adhesion status. Through the studies some conclusions received: (1) In the grinding process of stainless steel materials, materials generally be removed by plastic deformation mode, and most (about90%) grinding energy consumption should be consumed in the process of grinding CBN wheels’stroking and ploughing, and this part of the energy consumption would be mostly transformed into the heat those to produce high temperature in grinding zone. So the grinding heat flux is equal to the average energy flux part those consumed in grinding zone.(2When with the maximum undeformed chip thickness increase, the specific grinding energy decreased quickly, then the maximum undeformed chip thickness reaches a specific level, the specific grinding energy reaches the stable state.(3)Grinding force increased linearly with the areas of abrasive wear. When the he areas of abrasive wear reaches some point, grinding force suddenly increased, and materials surface appears grindingburn, the surface quality goes bad.(4)The stainless steel heat flux with linear speed increases with the decreasing of the grinding wheel, the grinding temperature increases with the rise of depth cutting. When the grinding wheel reaches a specific level, the grinding temperature suddenly drops.(5) In the effect of grinding temperature, the metallurgical of subsurface both have more or less translation, the depth of influence with the grinding temperature detection to have good corresponding relation. The metallurgical of subsurface is mainly changed of metallographic austenitic to martensite and ferritic organization transformation. The change of metallographic organization can significantly reduce the stainless steel corrosion resistance and mechanical strength.