Compound external mold for cold drawing steel tube

A steel pipe and cold drawing technology, applied in wire drawing dies and other directions, can solve the problems of small diameter reduction, high cost, and many cold drawing passes, and achieve the effect of large diameter reduction, low friction resistance and good surface quality.

Inactive Publication Date: 2010-05-19
HENGYANG VALIN STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diameter reduction of these two kinds of external molds is small during deformation. The outer diameter of the steel pipe is less than 70, and the diameter reduction of each pass is generally about 7-12mm, resulting in many cold drawing passes and high cost.

Method used

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  • Compound external mold for cold drawing steel tube
  • Compound external mold for cold drawing steel tube
  • Compound external mold for cold drawing steel tube

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Embodiment Construction

[0015] As shown in the accompanying drawings: a cold-drawn steel pipe composite outer mold, a cold-drawn steel pipe composite outer mold, which includes an outer mold body 1, the outer diameter D of the outer mold body 1 is 108mm, and the length is 50mm. The pass pattern of the outer mold body 1 is composed of four parts: the inlet arc section L1, the inlet cone section L4, the sizing belt L2, and the outlet cone L3. The arc radius R of the inlet arc segment L1 is 40 mm, and the length is 20 mm. The entrance conical section L4 is set between the entrance arc section L1 and the sizing zone L2, the length of the entrance conical section L4 is 15 mm, and the taper a is 12 degrees. The length of the sizing belt L2 is 10mm, and the diameter d is 51mm. The exit cone L3 is set behind the sizing belt L2, the length of the exit cone L3 is 5mm, and the taper b is 30 degrees.

[0016] In order to ensure the surface quality of the drawn steel pipe, the transition between the entrance ar...

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Abstract

The invention relates to a compound external mold for cold drawing a steel tube. The hole types of an external mold body comprise an inlet arc section L1, an inlet arc section L4, a calibrating strap L2 and an outlet cone L3. The arc radius R of the inlet arc section L1 is 30-60 mm. The inlet arc section L4 is arranged between the inlet arc section L1 and the calibrating strap L2; the conicity a of the inlet arc section L4 is 10-15 degrees; and the inlet arc section L4 of the compound external mold is longer so as to play roles of reducing the diameter and the wall. The outlet cone L3 is arranged behind the calibrating strapL2, and the conicity b of the outlet cone L3 is 30-45 degrees. The calibrating strap L2 is shorter than the inlet arc section L4 so as to reduce the friction force during drawing. In order to ensure the surface quality of the drawn steel tube, the inlet arc section L1 and the inlet arc section L4 of the compound external mold, the inlet arc section L4 and the calibrating straight L2, and the calibrating straight L2 and the outlet cone L3 are in smooth transition.

Description

technical field [0001] The invention relates to the production field of cold-drawn steel pipes, in particular to an outer mold used in the production process of cold-drawn steel pipes. Background technique [0002] In the production process of cold-drawn steel pipes, there are two types of outer molds for cold-drawn steel pipes: conical outer molds and arc-shaped outer molds. figure 1 As shown, its hole pattern is composed of three parts: the inlet cone section L1, the sizing belt L2, and the outlet cone L3; the arc-shaped outer mold is as attached figure 2 As shown, its hole pattern consists of three parts: the inlet arc segment L1, the sizing belt L2, and the outlet cone L3. The sizing belt L2 of the conical outer mold is shorter, and the sizing belt L2 of the arc-shaped outer mold is longer. During production, a conical outer mold is matched with a cylindrical inner mold to form a pass pattern, and an arc-shaped outer mold is matched with a conical inner mold to form a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C3/02B21C1/22
Inventor 李旭升朱哲管志高任小东
Owner HENGYANG VALIN STEEL TUBE
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