The deep hole processing of the camshaft

L/D> in mechanical processing; The five hole processing can be referred to as the deep hole processing, using ordinary twist drill to drill deep hole with the following difficulties. 1. Bit long and thin. Poor rigidity, bit easily when processing bending and vibration of the difficult to guarantee the straightness and machining precision of hole. 2. Chip, chip and ruled out on long and narrow, the chip is not easy eduction. 3. Deep hole fluid is not easy to enter, cutting temperature is too high, heat dissipation is difficult, bit is easy to break. Deep hole drill press process can be divided into different on solid objects three, drilling, reaming, nesting in drilling used most frequently in the solid material, such as 480 CAM used in deep hole is processed by gun drill through the two ends. Each hole deeply L / 2 + 10 mm. Gun drill drilling is single blade outside chip type, suitable for processing phi commonly 2 - Phi 20 mm hole, L/D> 100, surface roughness Ra12. 5 - 3. 2 mm, H8 - precision H10 level of deep hole. Single blade outside chip deep hole drill, the earliest used in processing the barrel, therefore calls gun drill, is also from 2 - The only way to phi 6 mm deep hole processing. Gun drill with v-shaped cutting edges and a cutting fluid hole drill bit, drill pipe, and is suitable for some special equipment for drill shank. High pressure cutting fluid ( 7MPa） Through the drill holes to the cutting area, cooling, lubrication and help chip removal, then cutting and cutting fluid along the v-shaped cutter bar into the central cooling system. Welding structure is used to drill for carbide,. Cutting parameter is commonly 0. 06 - 0. 1 mm/r, in order to better control the breakage of the cutting tool, cutting tool USES the radial load feedback, once the tool cutting force reaches a certain value, in the numerical control system, under the action of the cutting tool can automatically return, so as to avoid the gun drill broken, improve the service life of the cutting tool. After grinding blunt tool change, again can be used only for sharpening. CAM spindle oil is commonly used in deep hole processing coolant, although the oil cooling effect than emulsion is poor, but oil lubrication effect is much better than the cooling fluid.