Precision parts processing method for trapezoidal thread

by:NJPE     2020-02-05
Threads are widely used in various precision parts, such as screws, nuts, screws, lead screws, etc. It is mainly used to connect various parts and can also be used to transmit motion and load. There are many classification methods for threads. According to the tooth type of threads, they can be divided into triangular, trapezoidal saw tooth shape, circular, trapezoidal, etc; According to the shape of the outer profile of the thread, it can be divided into cylindrical thread and conical thread; It can also be classified according to matching nature, size unit, etc. The precision parts processing elements of the nut let NJPE precision senior adjustment machine to explain the processing method of trapezoidal thread for everyone: i. General technical requirements for trapezoidal threads the axial profile shape of trapezoidal Threads is isosceles trapezoid. For transmission, the precision requirement is high, the surface roughness value is small, and turning trapezoidal thread is more difficult than turning triangular thread. The general technical requirements for trapezoidal threads are as follows: 1. The middle diameter of the thread must be coaxial with the reference journal, and its large diameter size should be smaller than the basic size. 2. The trapezoidal thread is centered by the middle diameter. Therefore, the tolerance of the middle diameter must be guaranteed when processing the trapezoidal thread. The tooth angle of trapezoidal thread should be correct. 4. The surface roughness value on both sides of trapezoidal thread tooth type is small. Second, when precision parts are processed, the clamping of trapezoidal thread shaft parts requires turning trapezoidal thread due to large cutting force. Workpieces are generally clamped one by one. Axial application of limit steps or limit support to fix the axial position of the workpiece to prevent the workpiece from axial movement or displacement during turning, causing tooth disorder or damaging the turning tool. Three, trapezoidal thread turning tool clamping thread turning tool tip should be equal to the workpiece axis, the bisector of the angle between the two cutting edges should be perpendicular to the workpiece axis, during clamping, use trapezoidal thread to correct the tool setting template to avoid thread half-angle error. Four, trapezoidal thread turning precautions 1. When processing trapezoidal threads, the left and right knife borrowing method shall be adopted for processing, and the cutter-free three-edge cutting shall be carried out at the same time to produce a prick. 2. The tooth shape angle of the thread should be correct, and the surface roughness value on both sides of the thread tooth shape should be small. 3. During the processing of threaded precision parts, care should be taken not to change the rotating speed, otherwise teeth will be messed up.
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