Convex lens axis adopt is titanium alloy material, due to its high strength, hardness, processing to produce surface hardening layer, and material coefficient of thermal conductivity small, small modulus of elasticity, the springback amount of cutting machining surface is very big, the friction of cutter knife after, adhesive, and adhesive wear. In order to ensure the accuracy of contour machining, the coaxial degree of the parts is 0.006mm, which is almost impossible for the existing machine tools. Because the existing machine tool is started, the spindle of its own spindle beats > 0.01mm, it is easy to finish the processing task on such machine tool. The dimension precision requirements of the part shape and hole are very high, respectively 0.005mm and 0.01mm, and the surface roughness value Ra= 0.8mm is required. Under normal circumstances, it is necessary to finish the drawing in grinding machine. Since there is no grinding machine in the plant for precision machining, the task must be completed by a lathe.
The main deflection Angle of 90 is the positive and negative external circular offset knife and the transverse tank knife each. In order to reduce the cutting resistance and prevent the material from overheating in the cutting process, the cutting resistance of the cutting tool can be reduced to 20 ~ 25. In order to avoid the sharp friction and adhesion of the cutter surface during the cutting process, the Angle of the cutter is 5 ~ 8. Because the titanium alloy material coefficient of thermal conductivity, low elastic modulus, bonding processing process, it is not easy for cutting parameters in machining setting is too large, spindle speed selection in 350 ~ 500 r/min, is unfavorable and exorbitant. On the back of the knife and the size of the cart, the choice is larger, the choice of fine cars is smaller.
