Turning processing characteristics

Is on the lathe, the use of the linear motion of the workpiece rotation and tool or curve motion to change the shape and size of the blank, processing it to conform to the requirements of the drawings. Turning processing is using relative to the workpiece on the lathe tool rotation method for machining the workpiece. Turning processing the cutting can be mainly provided by the workpiece instead of cutting tools. Turning is the most basic, the most common machining methods, occupies an important position in the production. Turning is suitable for processing of rotary surface, most has the workpiece can be used on the surface of the rotary cutting methods, such as the inner and outer cylinder, inner and outer conical surface, end surface, groove, thread and rotary forming surface, such as cutting tool is mainly used in lathe tool. In all kinds of metal cutting machine tools, lathe is the most widely used type, accounts for about 50% of the total machine tool. Lathe tool is available to turning processing of workpiece, and the available drill, reamer, tap and knurled knife for drilling, reaming, tapping screw thread and knurled operation, etc. According to the technological characteristics and layout form and structure characteristics of different, can be divided into horizontal lathe lathe, lathe, vertical lathe, turret lathe and copying lathe, mostly horizontal lathe. Coarse car: according to the turning process drawing for rough turning processing, cutting speed, cutting process in strict accordance with the provisions of ( General cutting speed for the 5 r/min. Cutting the amount of 10 mm ~ 12 mm) 。 2. Rough turning aging: coarse car after the completion of the bearing parts, using three bearing, flat ( Don't allow together) , aging time of not less than 48 hours after the car can be fine processing. 3. Essence car bearing parts, cutting speed at six to eight revolutions per minute, cutting quantity to zero. 3 to 0. 5 mm. 4. Forming fine cars: finally forming fine car bearing parts, to prevent deformation of parts, parts should be the fixed clamping device to loosen, make parts in no stress state, the turning speed of 8 rotations per minute (RPM), cutting the amount of 0. 2 mm. 5. Cross, three rows of roller wheel bearing inner ring special process: to prevent cross, three rows of roller wheel bearing inner ring deformation after heat treatment. The turning processing must be carried out in pairs processing, namely race back to back processing, heat treatment is not cut off before, after hot cut to shape. After hot fine cars: bearing inner and outer circle after heat treatment, finish turning into a process, process planning with 2. 3 and 2. 4