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Processing method of zigzag internal thread

A processing method and internal thread technology, which is applied in the field of zigzag internal thread processing, can solve problems affecting processing quality, cold work hardening, workpiece scrapping, etc., and achieve the effects of improving labor productivity, reducing tool changes, and improving tool life

Active Publication Date: 2020-05-01
CHANGZHOU INST OF MECHATRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the turning tool is fed 10 times to the thread size, the working surface undergoes severe extrusion and friction, resulting in cold work hardening and cracks, which not only affects the processing quality, but even causes the workpiece to be scrapped because it cannot be repaired.

Method used

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  • Processing method of zigzag internal thread
  • Processing method of zigzag internal thread
  • Processing method of zigzag internal thread

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Embodiment Construction

[0025] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] Thread cutting generally refers to the method of processing threads on workpieces with forming tools or abrasive tools, mainly including turning, milling, tapping, threading, grinding, grinding and whirlwind cutting. When turning, milling and grinding threads, the transmission chain of the machine tool ensures that the turning tool, milling cutter or grinding wheel moves a pitch (lead) accurately and evenly along the axis of the workpiece every time the workpiece is turned. When tapping or threading, the tool (tap or die) and the workpiece make relative rotational movement, and the tool (or workpiece) is guided to move axially by the thread groove formed first.

[0027] In the thread processing of single piece and ...

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Abstract

The invention relates to a method for processing a zigzag internal thread. The flank angle of the working surface of the zigzag internal thread is 3 degrees, and the flank angle of the non-working surface of the zigzag internal thread is 30 degrees. The method comprises the steps that firstly radial feed is performed twice, then axial feed matched with the radial feed is carried out on the non-working surface for three times, then radial feed is carried out once, the axial feed matched with the radial feed is carried out on the working surface twice, then the radial feed is carried out once, and finally the axial feed matched with the radial feed is carried out on the working surface once. The processing method adopts a positive and negative cutting method, and after ten times of cutting,it is ensured that cutting chippings can be cut from both the non-working surface and the working surface, and the chipping shape is a V shape, so that the problem of the crack of the working surfacewhen the zigzag thread is processed is solved effectively.

Description

technical field [0001] The invention relates to a processing method of a zigzag internal thread, which is processed by a forward and reverse knife driving method. Background technique [0002] A shell workpiece, the material is 40CrNiMo, the hardness after treatment is HRC28-32, and the inner hole needs to be processed with zigzag internal thread, such as figure 1 shown. Among them, the flank angle α of the working surface of the zigzag internal thread is 3°, and the flank angle β of the non-working surface is 30°. [0003] 1) Presentation of the question [0004] After turning the 33° special zigzag internal thread, it was found by magnetic flaw detection that there were a large number of cracks on the working surface, and the reject rate was as high as 40%-50%, which seriously affected the normal production. [0005] 2) Cause analysis [0006] When processing zigzag internal threads, a 33° special thread forming turning tool is usually used, and the straight-forward me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23G1/16
CPCB23G1/16
Inventor 金嘉俊徐嘉乐俞浩荣姚素芹
Owner CHANGZHOU INST OF MECHATRONIC TECH
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