Cindy@njprecisionengineering.com

Lathe car groove operation, Nanjing Precision Engineering Co., ltd

by:NJPE     2020-02-12
The groove is set on the parts, one is to facilitate the subsequent processing, such as lathe turning thread retracting groove, grinding process of the pass groove, etc; The second is to ensure the accuracy of axial positioning of parts during assembly, such as shoulder groove; The third is the T-shaped Burr and dovetail groove used for random movement or fastening; The fourth is to set different forms of lubrication grooves on the matching surfaces that move with each other, as well as sealing grooves and dustproof grooves that play a sealing or dustproof role. The structural forms of grooves include rectangular grooves, forming grooves, oblique panning grooves, end face grooves, etc. According to the groove position, it can be divided into outer groove and inner groove. Cutting of rectangular groove: when turning rectangular groove, the geometric parameters and installation method of the groove cutter are generally similar to those of the cutting cutter, and they also have two symmetrical tool tips, vice deflection angle and vice rear angle, the main cutting edge is parallel to the workpiece axis. The basic method of cutting rectangular grooves is: 1) When cutting a narrow rectangular groove, the width of the main cutting edge is equal to the width of the groove, the length of the cutter head is slightly larger than the depth of the groove, and the turning tool enters and exits straight at one time. 2) For turning a wider rectangular groove, a narrower slotting knife can be used, and the tool can be turned roughly in several times. After leaving a margin on the bottom surface and both sides of the groove, the tool can be turned to the size with a finishing tool. Cutting of forming groove: forming groove includes circular arc groove, trapezoidal groove, etc. 1) Narrow circular arc groove or trapezoidal groove, the groove knife is sharpened into the form of the same shape and size as the forming groove, and the vehicle is fed horizontally at one time. 2) Wider and deeper forming grooves, especially the forming grooves of inner holes, are often restricted by the rigidity of turning tools by the following two methods: ① cutting in two steps. Generally, the straight groove is driven by a slotting knife first, and then turned by a forming knife. 2 Left and Right knife feed or oblique feed. When the lathe is extremely wide and deep, the small sliding plate can be shaken while the middle sliding plate enters the tuna horizontally to make the turning tool move slightly left or right, forming the feed of left and right channeling knives for single-sided cutting; Or at the same time of transverse feeding of the middle sliding plate, shake the small sliding plate to make the turning tool move slightly in one direction and feed it obliquely on one side. After the rough car, leave a comprehensive amount, and then use a fine turning knife to the size. Cutting of inclined groove: inclined groove is a pass groove used for grinding cylindrical surface and end face at the same time to form an empty knife in both directions of cylindrical surface and end face. The oblique groove is divided into linear shape and circular arc shape, and the general inclination is 45. , Lathe slot cutter has the characteristics of inner hole turning tool, should be based on the size of the groove arc, in the cutting edge, should be ground into the corresponding arc back angle. When cutting, turn the small slide plate to 450 and cut and form it with the small slide plate at one time. Cutting of end face Groove: The slotting knife for cutting end face groove has the comprehensive characteristics of outer circular turning tool and inner hole turning tool. One is equivalent to outer circular turning tool and the other is equivalent to inner hole turning tool. Lathes, therefore, should be sharpened according to their respective cutting characteristics. (1) Geometry of straight groove end face straight groove cutting knife. Outside the lathe tool tip. It is equivalent to turning the inner hole, so the back of its vice should grind out the corresponding circular arc back angle R according to the size of the end face arc to prevent the back of the Vice from colliding with the outer groove surface. (2) The T-shaped groove of the T-shaped tanker is divided into three steps by three Turning Tools: 1) Use the end face straight groove cutting knife, feed longitudinally, and drive out the end face straight groove. 2) Use the elbow right slotting knife instead, just like the straight groove of the inner hole of the car, and the outer groove of the car. 3)Use the elbow left slotting knife to drive out the inner groove. (3) The steps and methods of turning dovetail groove and turning dovetail groove are basically the same as those of cutting T-shaped groove, and three turning tools are also used in three steps, I . e. after turning the end face straight groove first, the dovetail groove is formed by using left and right inclined plane forming knives respectively. When turning T-shaped groove and dovetail groove, the cutting edge on the outside should also be sharpened according to the principle of inner hole turning tool. The lathe is also due to the limited width of the straight groove on the end face, the cutter bars of the left and right elbow slotting knives and the left and right inclined plane forming knives are relatively thin, and the strength of the cutter head is relatively poor, so the feed rate should be appropriately reduced, and observe the chip removal status at any time and remove it in time. When using high speed steel turning tools, the lathe should also reduce the cutting speed and add cutting fluid.
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