1> Guangdong machining factory teaches you what's the secret of sharpening, how to sharpen high speed steel ladder thread turning tool? Thread turning mainly more hands-on, more with the teacher Fu learn, so as to progress quickly.
Thread is a continuous protrusion with specified tooth profile formed along the helix on the surface of cylinder or cone. Thread is widely used in various machines. For example, four screws are used to clamp the lathe tool on the lathe square tool holder, and the thread is used to transfer power between the lathe screw and the split nut. There are many ways to process thread, and in general machining, the method of turning thread is usually used (one of the basic skills of Turner). When Guangdong machining plant processes thread on horizontal lathe, it is necessary to ensure the movement relationship between the workpiece and the tool, that is, the tool moves a pitch (or lead) evenly with each turn of the spindle (one turn of the workpiece). Their motion relationship is guaranteed as follows: the spindle drives the workpiece to rotate together, the motion of the spindle is transmitted to the feed box through the change gear box, and then to the lead screw after the feed box changes speed, and the tool holder and turning tool are driven to move in a straight line by the cooperation of the lead screw and the split nut on the chute box, so that the rotation of the workpiece and the movement of the tool are realized by the drive of the spindle, Thus, the strict motion relationship between the workpiece and the tool is ensured. In the actual thread turning of Guangdong machining plant, due to various reasons, the movement between the spindle and the cutter has a problem in a certain link, which causes faults in the thread turning and affects the normal production. At this time, it should be solved in time.
2> Incorrect profile angle
2.1 incorrect knife tip angle
When grinding the turning tool, the sharp angle is not correct, that is, the angle between the projections of the two cutting edges of the turning tool on the base plane is not consistent with the profile angle of the thread, which leads to the incorrect angle of the thread. Solution: when grinding the turning tool, the angle ruler or sample plate must be used to detect and obtain the correct tooth profile angle. The method is: parallel the sample plate or angle ruler to the front of the turning tool, and then check it with the light transmission method. Commonly used metric thread profile angle: Triangle thread 60 °, trapezoid thread 30 °, worm 40 °, 2.2 radial rake angle not corrected
In order to smooth chip removal of turning tool, reduce surface roughness and chip accumulation, Guangdong machining plant often grinds radial rake angle, which causes the cutting on both sides of turning tool not to coincide with the axial direction of workpiece, so that the thread profile angle of turning out workpiece is larger than the tool tip angle of turning tool. The larger the radial rake angle is, the larger the error of profile angle is. At the same time, the thread profile in the axial section is not a straight line, but a curve, which affects the matching quality of the thread pair. Solution: when grinding the thread turning tool with large radial rake angle, the tool tip angle must be corrected through the angle between the two cutting edges of the turning tool, especially for the thread with high machining accuracy, the correction calculation method is: Tan = cosrp · Tan, where, ε R is the angle between the two cutting edges of the turning tool; RP is the radial rake angle; α It is the angle of tooth.