External mould assembly for cold-drawing pipes

A technology of mold components and pipes, which is applied in the direction of wire drawing dies, etc., can solve the problems of high scrap rate, difficult inner hole of pipes, changes in wall thickness and size, and large bending degree, so as to increase the cost of molds and eliminate the effect of sharp diameter reduction

Inactive Publication Date: 2010-09-08
浙江伦宝管业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The external mold components used in the existing hollow drawing process have the following problems: 1. The inner hole and wall thickness of the original pipe can only be allowed to increase or decrease naturally, and it is difficult to control the dimensional changes of the original pipe inner hole and wall thickness through the outer mold
2. The

Method used

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  • External mould assembly for cold-drawing pipes
  • External mould assembly for cold-drawing pipes

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Embodiment Construction

[0012] see figure 1 . Die base 1 is fixed on the frame. The ring wall of the outer mold receiving cavity of the mold base 1 is a tapered ring wall from the back to the front, and the front mold 3 and the rear mold 4 are accommodated in the outer mold receiving cavity. In order to ensure the firmness and concentricity of the front mold 3 and the rear mold 4, the positioning wedge 2 is embedded between the tapered ring wall and the outer wall of the front mold 3 and the rear mold 4, so that the front mold 3 and the rear mold 4 are tightly It is firmly combined into one body and accommodated in the receiving cavity of the outer mold. From ensuring the firmness and concentricity purpose of front mold 3 and back mold 4, can realize by the means of different changes, for example: the outer wall of front mold 3 and back mold 4 can be cylindrical, also can be taper, they As long as it matches the inner hole wall of the positioning wedge 2, it is even possible to add some concave-co...

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Abstract

The invention relates to an external mould assembly for cold-drawing pipes, comprising a mould seat, the middle part of the mould seat is provided with an axial external mould containing cavity, the front of the external mould containing cavity is the exit of the mould seat; wherein the external moulding containing cavity is internally provided with a front mould and a rear mould, aperture of a rear mould sizing region is larger than the aperture of a front mould sizing region, and a rear mould transition angle of a rear mould transition region is greater than the a front mould transition angle of a front mould transition region. The invention adopts double external mould structure to carry out steel tube empty sinking operation, not only dimensional change of inner hole and wall thickness of target steel tube can be controlled by the external mould, but also the phenomenon that the diameter of the original pipe is sharply reduced can be eliminated, the problem that the target pipe is easy to crack and has high flexibility when in cold-drawing pipe process reinforcement is effectively solved, and the invention has the advantage that structure improvement is simple while mould cost is not increased.

Description

【Technical field】 [0001] The invention belongs to an outer mold assembly for cold-drawn pipes. 【Background technique】 [0002] At present, if you want to obtain seamless steel pipes with smaller size and better quality, you must use cold rolling, cold drawing or a combination of both. Cold drawing refers to drawing the material at room temperature in order to achieve a certain shape and certain mechanical properties. Cold drawing is usually carried out on a 0.5-100T single-chain or double-chain cold drawing machine. Its products Compared with thermoformed products, it has the advantages of high dimensional accuracy and good surface finish. The empty drawing process is one of the production methods of cold drawn steel pipes. In the operation, only the outer mold assembly is needed instead of the inner mold and mandrel assembly. The outer mold assembly includes the mold base and the outer mold. The through hole is used to receive the outer mold. The working area inside the o...

Claims

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Application Information

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IPC IPC(8): B21C3/02B21C1/22
Inventor 姜建林郑忠财
Owner 浙江伦宝管业股份有限公司
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