Temperature measurement and theoretical analysis in high-speed grinding of hardened cold work die steel 9CrWMn

Abstract

Cold work die steel 9CrWMn is one kind of high tensile strength steel which is used to manufacture stamping mold, shearing mold, roller die, cold heading, and cold extrusion die mold. Because of its high hardness and toughness, 9CrWMn is difficult to be machined by conventional manufacturing techniques. A series of high-speed grinding experiments were conducted for cold work die steel 9CrWMn using cBN wheel to assess the grinding characteristics in terms of grinding temperature. The grinding temperatures were measured by using a grindable thermocouple technique. 9CrWMn-constantan is not a kind of standard thermocouple, calibrating the thermocouple from the comparison method field of vision was done in this work. A series of temperature field simulations of high speed grinding of cold work die steel 9CrWMn with abrasive grains were conducted in Deform-3D and mesh adaptive technology was adopted to get optimized results. This paper gives theoretical analyses that contribute to the temperature phenomena. The simulation results were consistent with the experimental temperature measurements.