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Process for processing square bar stud bolt

A technology of stud bolts and processing methods, which is applied in the direction of bolts, threaded fasteners, and threaded products, can solve the problems of difficulty in meeting precision requirements, high waste and defective products, waste of materials, etc., and achieve the elimination of poor quality. Stable, low product cost, solve the effect of easy breaking

Inactive Publication Date: 2002-09-04
李庆永
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  • Abstract
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Problems solved by technology

In the turning production process, due to the large cutting force of the four corners of the blank on the turning tool, a certain yield force is formed at the end of the blank. The two ends of the turning are cylindrical, the diameter of the head is thick and elliptical, and the root is small. High, waste materials, high power consumption and labor, the product is difficult to meet the precision requirements

Method used

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  • Process for processing square bar stud bolt
  • Process for processing square bar stud bolt
  • Process for processing square bar stud bolt

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Embodiment Construction

[0019] The process of the present invention adopts the principle of cold extrusion plastic transformation technology, and the means of making cold extrusion plastic transformation composite structure molds is used for cold extrusion processing and production. Taking the production of bicycle seat card square rod stud bolts as an example, firstly, the square long material is cut into The 60mm pup joint blank is processed by pickling, derusting, phosphating, and saponification. It uses a punch to match the mold and undergoes two (times) cold extrusion processing. Each time the two ends are processed at the same time, it becomes a square rod blank 1.

[0020] In the first step, two plastic-variable four-arc molds 5 are installed on the workbench and under the slider of the 16-ton punch press respectively, that is, a fixed mold and a dynamic mold. Take a square rod blank 1 and put it vertically into the square hole 5 of the plastic variable four-arc mold as shown in Figure 8. The u...

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Abstract

The production method of square stem stud bolt includes the following steps: first step, stamping and plastically deforming the square bar blank material into a four-arc blank material, i,e, respectively mounting the plastically-deforming four-arc dies on two ends of the square bar blank material and stamping it form a four-arc blank material by means of stamping machine; second step, stamping and plastically deforming four-arc blank material to form a cylindrical-headed blank material, i.e. respectively mounting the plastically deforming cylindrical head dies on two ends of the four-arc blank material and stamping it to form a cylindrical-headed blank material; and third step, respectively thread-rolling two ends of the cylindrical-headed blank material so as to obtain the invented square stem stud bolt. This invention has no need of turning process, and its rate of finished products can be raised.

Description

technical field [0001] The invention relates to a method for processing square bar stud bolts. technical background [0002] Cylindrical shapes at both ends of the square rod stud bolts of the bicycle seat are processed by turning with a small instrument lathe. In the turning production process, due to the large cutting force of the four corners of the blank on the turning tool, a certain yield force is formed at the end of the blank. The two ends of the turning are cylindrical, the diameter of the head is thick and elliptical, and the root is small. High, waste materials, high power consumption and labor, the product is difficult to meet the precision requirements. The invention adopts the production method of utilizing molds and cold extrusion molding. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a square rod stud bolt processing method which can save material, reduce processing cost and have high yield. ...

Claims

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Application Information

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IPC IPC(8): B21D22/00B21H3/06B21K1/44
Inventor 李庆永李庆敏
Owner 李庆永