Cold-drawing finishing device and process

A cold-drawing finishing and set-up technology, which is applied to metal drawing forming tools, manufacturing tools, metal processing equipment, etc., can solve the problems that the dimensional accuracy of inner holes cannot meet its requirements, and the loss of high-strength pipe cold-drawing molds is large. , to achieve the effect of ensuring finishing effect and quality and saving resources

Pending Publication Date: 2020-11-20
宜昌中南精密钢管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the high hardness of high-strength quenched and tempered tubes, the hardness of the matrix is ​​usually greater than 250HB. In the process of cold-drawing with int

Method used

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  • Cold-drawing finishing device and process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 Shown, a kind of cold drawing finishing device, it comprises mold base 6, and the inside of described mold base 6 is fixedly installed with outer mold 5; Also comprises inner mold 3, and described inner mold 3 is fixedly installed on the pull bar 7, so The pull rod 7 is fixedly connected with the fixed core rod 8; the inner mold 3 and the outer mold 5 are used in pairs, and the distance between the inner mold 3 and the outer mold 5 is ≥10mm. By adopting the cold drawing and finishing device with the above structure, the products with out-of-tolerance dimensional accuracy produced in the cold drawing production process can be cold drawn and finished again to achieve the required dimensional accuracy, and then turn them into qualified products, which saves resources. , while effectively reducing costs.

[0031] Among them, in the finishing process, the relative position of the inner mold and the outer mold is very important, and the distance is ≥10mm, wh...

Embodiment 2

[0038] The cold drawing process of unqualified products is carried out with a cold drawing finishing device, including the following steps:

[0039] Step 1: Fix and install the fixed core rod 8, and pass the tube blank 1 through the fixed core rod 8;

[0040] Step 2: The tie rod 7 is fixedly connected with the installation sleeve 14 on the head of the fixed core rod 8 through the tie rod head 13;

[0041] Step 3: According to the distance requirement between the inner mold 3 and the outer mold 5, select a suitable length spacer 4 to position the inner mold 3, and fix the inner mold 3 on the tie rod 7 through the lock nut 2;

[0042] Step 4: Preliminarily pass the end of the tube blank 1 through the inner mold 3 and the outer mold 5, and fix the end of the tube blank 1 with the slider through the clamp, start the slider, and pull the tube blank 1;

[0043] Step 5: During the drawing process, the tube blank 1 is drawn successively through the direction of the outer mold 5 and t...

Embodiment 3

[0045] In this embodiment, the size of the tube blank 1 used is 220 / 198.5, the ellipticity of the inner hole is 0.6mm, the outer mold is 218, and the inner mold is 199. After cold drawing by the above-mentioned device, the inner hole ellipticity is 0.3mm, Meet the requirements;

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Abstract

The invention discloses a cold-drawing finishing device and a process. The cold-drawing finishing device comprises a die holder, and an outer die is fixedly mounted inside the die holder; the cold-drawing finishing device further comprises an inner die, wherein the inner die is fixedly mounted on a pull rod, and the pull rod is fixedly connected with a fixed core rod; the inner die and the outer die are used in pairs, and the distance between the inner die and the outer die is larger than or equal to 10 mm. The finishing device can carry out cold-drawing finishing on products which are generated in the cold-drawing production process and have out-of-tolerance dimensional accuracy again, so that the required dimensional accuracy is achieved, then the products are converted into qualified products, the purpose of saving resources is achieved, and meanwhile the cost is effectively reduced.

Description

technical field [0001] The invention belongs to the field of cold-drawn tube finishing devices, and in particular relates to a cold-drawing finishing device and a process. Background technique [0002] Due to the high hardness of high-strength quenched and tempered tubes, the hardness of the matrix is ​​usually greater than 250HB. In the process of cold-drawing with internal and external dies, the dimensional accuracy of the inner hole generally cannot meet the requirements, and the high-strength tube cold-drawing die loss is large. [0003] At present, according to preliminary statistics, in the field of cold-drawn processing of high-strength quenched and tempered precision steel pipes, defective products due to excessive dimensional accuracy of the inner hole account for about 5%. Enterprises, about 1,500 tons of products have products with poor precision every year. Contents of the invention [0004] The purpose of the present invention is to provide a cold-drawing fin...

Claims

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Application Information

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IPC IPC(8): B21C1/24B21C3/00B21C3/02B21C3/16
CPCB21C1/24B21C3/00B21C3/02B21C3/16
Inventor 赵江华卢凤云罗箫凡彭飞陈念
Owner 宜昌中南精密钢管有限公司
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