Numerical control turning method for multi-line trapezoidal threads

Abstract

The invention discloses a numerical control turning method for multi-line trapezoidal threads. The method comprises the following steps that S1, rough machining is conducted, specifically, programming is conducted by means of a G76 instruction, and rough machining is conducted by means of a thread roughing tool; S2, two side surfaces are sleeked; S3, precise line distribution of double-line trapezoidal threads is conducted, specifically, calling times of two subprograms are determined according to S2, the sum of left offset and right offset is enabled to be equal to Z-direction total offset, after a first thread is machined, a thread machining starting point is shifted by a thread pitch in a Z direction, and then precise line distribution of the double-line trapezoidal threads can be completed; and S4, precision machining of the multi-line trapezoidal threads is conducted. According to the method, the multi-line trapezoidal threads are machined on a numerically controlled lathe, the problem of precise line distribution during machining by a common lathe can be solved, the phenomenon of disordered threads during re-machining through an operation method of changing tools after tool breakage occurs can be effectively avoided, and the advantage of machining the multi-line trapezoidal threads through numerical control turning is guaranteed.

Description

technical field [0001] The invention relates to the field of trapezoidal thread processing, in particular to a numerically controlled turning method for multi-line trapezoidal thread. Background technique [0002] Trapezoidal thread is a commonly used transmission thread with relatively high precision requirements. Due to the difficulty in processing trapezoidal thread, the dimensional accuracy is not guaranteed, the processing time is long, the scrap rate is high, and the processing method is relatively backward. When processing multi-line trapezoidal threads on ordinary lathes, it is difficult to achieve precise thread separation. Using CNC lathes for processing can solve the problem of precise thread separation. In the process of CNC turning, how to avoid random buckling is also a difficult problem when the tool breaks and then reprocesses. [0003] There are two main methods of CNC turning of multi-line trapezoidal thread: [0004] (1) Straight-forward method. This met...

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Problems solved by technology

[0004] (1) Straight-forward method. This method can be realized by using the command G92 on the CNC lathe. The thread turning tool is intermittently fed to the depth of the tooth in the X direction. When using this method to process trapezoidal threads, the three sides of the thread turning tool will participate in cutting. It leads to difficulty in chip removal, increased cutting force and cutting heat, and severe tool tip wear. When the cutting amount is too large, the phenomenon of "knife sticking" may also occur. Obviously, this method is not suitable for multi-line trapezoidal thread. processing

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