The process characteristics of turning process

CNC Turning process is characterized by the workpiece rotation of the main movement, CNC turning tool for the movement. Turning can be used in horizontal lathes, vertical lathes, turret lathes, profiled lathes, automatic lathes, CNC lathes and a variety of special lathes, mainly used to process a variety of rotating surface, according to the selected turning angle and Cutting the amount of different, turning can be divided into rough cars, semi-fine cars and fine cars and other stages. among them:

The roughness dimension of the roughing is Ⅲl ~ rrl2, the surface roughness R. The value is 12 5-25

Semi-fine car for the n9 ~ ITlO, R. Value is 3 2-6 4 ¨ …;

Fine train for the n Tuen a IT7, R. The value of 0 8-1 6 “m (fine non-ferrous metals R. value can reach o 4 a o 8 ¨ m).

(1) turning the outer circle. CNC turning the outer circle is the most common and basic turning method using a variety of turning tools for turning small and medium parts (including the outside of the slot) method. Among them, the left side of the knife is mainly used for the need to feed from left to right, turning the right side of the right shoulder of the circumference and the right side of the knife can not turn the outer circle.

(2) turning the inner circle.CNC  turning the inner circle (hole) refers to the use of turning method to expand the hole of the workpiece or machining the inner surface of the hollow workpiece. This is also one of the commonly used turning methods. Common method of turning holes When turning the blind hole and the step hole, the turning tool should first feed, when the car to the root of the root when the horizontal feed, from the center to the center of the car or the end of the table.

(3) turning plane. Turning plane mainly refers to the car end plane (including the step end), the common method of drawing side of the plane turning plane, can be used larger knife back knife, smooth cutting, smooth surface, large, small plane can be used 90. The left side of the knife from the center to the center of the turning plane, suitable for processing smaller size plane or general step end with 90. The left side of the knife from the center to the outside of the turning plane, for the processing center with the end of the hole or the general side of the end of the use of the right side of the plane turning plane, the higher the strength of the head, suitable for turning a large plane, flat.

(4) turning conical surface. Cone can be divided into inner cone and outer cone, can be regarded as the inner circle, a special form of the outer circle. Inside and outside the cone with a close, easy to disassemble, after repeated demolition can still maintain the exact alignment of the characteristics, widely used in the requirements of accurate and often need to disassemble the pieces. Engineering often used standard cone with Mohs taper, metric taper and special taper. In the ordinary lathe on the processing of the cone method of a small skid plate indexing method, tailstock offset method, by the method and wide knife method, small skid plate indexing method is mainly used for single-piece small batch production, Lower, shorter length (≤100mm); tailstock offset method for single or batch production of shaft parts on the longer outer cone; by the mold for the mass and mass production of longer inner and outer cone Surface; wide knife method for batch and mass production of shorter (≤ 20mm) of the inner and outer cone.

(5)CNC turning thread. In the general lathe on the general use of forming turning tools to thread processing, processing ordinary thread, square thread thread trapezoidal thread and modulus thread when used in the forming tool.