Processing the Working Parts of Tools Used in Construction Industry Using High Energy Methods

摘要

This paper considers the effect of hardening of throwaway cutting inserts made of hard alloy T15K6 using continuous laser impact at various modes. Tests were carried outon inserts made of hard alloy T15K6. The cutting properties of the inserts were determined by cutting on a T612 vertical milling machine. A face mill with a diameter of 100 mm with mechanical mounting of tested inserts was used as a tool. Dry milling was performed using two inserts. At that, cutting mode was of impact nature as the mill diameter was larger than the width of machined workpiece. Number of passes - 5. Cutting modes: ⅴ = 197 m/min, h = 1 mm, S = 160 mm/min, b = 90 mm. Machining was performed on work pieces made of 40X grade steel (GOST 4543-71). Work piece dimensions- 160x60x90 mm. During the machining, hard alloy inserts moved beyond the workpiece edge and cut into it from the other side. One of the main performance characteristics of hard alloys is material rigidity (modulus of elasticity, E). Tests were carried out after various types of laser impact at bending and material rigidity was determined by strain gauging. Decreasein the slope of straight-line portion of relative strain-versus-stress curve at bending indicates the decrease in hard alloys' modulus of elasticity after laser processing. Small defect structure is being formed.