Affect the factor of process the surface layer physics machine function
Chinaprecision machining In slice pare process, the work piece because of being subjected to slice to pare the dint and slice the function of pare the heat, make the physics machine the function creation of the surface layer metals change, the variety of the most is variety and Residual stress s that the variety, gold that the surface layer metals shows minute details the degree of hardness organizes mutually should the creation of the dint.Because whetting to pare to process the mold produce transforms and slices to pare the hot ratio knife blade to slice to pare serious, as a result whet to pare to process to process behind the surface layer variety of above-mentioned three physicses machine function and would be very big.
(A)The surface layer is cold to make the hardening
1. Chinaprecision machining Cold make to harden and it assesses the parameter The machine processes the process in because of slicing to pare the output mold of the dint function to transform, make the Crystal grain space distort, mutation, a creation shears to slice to slip to move, grain of Crystal grain drive make longer to turn with fiber, even broken up, these would make the surface layer metals of degree of hardnesses and strength raise, this kind of phenomenon be called cold make the hardening.( or be called to enhance)The result that the surface layer metals enhance, will enlarge the resistance that metals transform, let up the mold of the metals, the physical property of the metals also will take place the variety. Drive cold make the unsteady appearance that the metals of the hardening is placed in the high ability, only have a probably, the unsteady appearance of the metals will convert toward more stable appearance, this kind of phenomenon is called to weaken.The size that weakens the function is decided by the temperature high and low, the temperature keeps on the length of time and enhances the size of the degree.Because the metals is in the function that the machine processes to be subjected to the dint and heat at the same time in the process, therefore, processing after the surface layer end property of the metals is decided by to enhance and weaken the comprehensive function of result.
Chinaprecision machining Assess cold make the hardening of index sign have three, namely the show minute details of the surface layer metals degree of hardness HV, harden the layer depth h and harden the degree N.