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A method of making a cold-drawn outer mold

A manufacturing method and technology of mold cores, which are applied to metal drawing forming tools, wire drawing dies, manufacturing tools, etc., can solve the problems of affecting drawing efficiency, increasing the production cost of external molds, cracking and scrapping mold cores, etc., and prevent early Effects of abnormal failure, reliable preload, dimensional stability and improved service life

Active Publication Date: 2020-03-27
浙江三基钢管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the mold casing of the cold-drawn outer mold used in the cold-drawing process of steel and other metals is generally made of No. 45 steel, and the mold core is made of tungsten steel. Core interference fit, sometimes the mold core will be cracked and scrapped during drawing production, which will affect the drawing efficiency and increase the production cost of the outer mold

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: a kind of manufacture method of cold-drawn outer mold, this cold-drawn outer mold is made of die sleeve and mold core, the manufacture method of this cold-drawn outer mold comprises the following steps:

[0014] (1) 5CrNiMo forged steel is used as raw material to rough out the mold sleeve, and tungsten steel is used as raw material to rough out the mold core;

[0015] (2) Quenching the die sets until the hardness reaches HRC 42-48, and then finishing;

[0016] (3) Use the cemented carbide grinding head to trim the outer surface size of the mold core, and adjust the assembly interference between the mold core and the outer mold to meet: C=0.45%*D, where C represents the assembly interference between the mold core and the mold sleeve , D represents the outer diameter of the core;

[0017] (4) At 520 ℃, the mold core and the mold sleeve are hot-fitted to obtain the outer mold, and then the outer mold is finished to the required diameter to complete the produ...

Embodiment 2

[0019] Embodiment 2: a kind of manufacture method of cold-drawn outer mold, this cold-drawn outer mold is made of die sleeve and mold core, the manufacture method of this cold-drawn outer mold comprises the following steps:

[0020] (1) 60Si2Mn forged steel is used as raw material to rough out the mold sleeve, and tungsten steel is used as raw material to rough out the mold core;

[0021] (2) Quenching the die sets until the hardness reaches HRC 42-48, and then finishing;

[0022] (3) Trim the outer surface size of the mold core with a carbide grinding head, and adjust the assembly interference between the mold core and the outer mold to meet: C=0.45%*D, where C represents the assembly interference between the mold core and the mold sleeve , D represents the outer diameter of the core;

[0023] (4) At 515 ℃, the mold core and the mold sleeve are hot-fitted to obtain the outer mold, and then the outer mold is finished to the required diameter to complete the production of the ...

Embodiment 3

[0025] Embodiment 3: a kind of manufacture method of cold-drawn outer mold, this cold-drawn outer mold is made of die sleeve and mold core, the manufacture method of this cold-drawn outer mold comprises the following steps:

[0026] (1) Roughly process the mold sleeve with 42CrMo round steel as raw material, and rough process the mold core with tungsten steel as raw material;

[0027] (2) Quenching the die sets until the hardness reaches HRC 42-48, and then finishing;

[0028] (3) Trim the outer surface size of the mold core with a carbide grinding head, and adjust the assembly interference between the mold core and the outer mold to meet: C=0.45%*D, where C represents the assembly interference between the mold core and the mold sleeve , D represents the outer diameter of the core;

[0029] (4) At 525 ℃, the mold core and the mold sleeve are hot-fitted to obtain the outer mold, and then the outer mold is finished to the required diameter to complete the production of the cold...

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Abstract

The invention discloses a manufacturing method of a cold-drawing outer mold. The method comprises the following steps: roughly machining a mold cover by taking 5CrNiMo forged steel or 60Si2Mn forged steel or 42CrMo round steel as a raw material, and roughly machining a mold core by taking a hard alloy as a raw material; quenching the mold cover till the hardness HRC reaches 42-48, and then carrying out finish machining; finishing the dimension of the outer surface of the mold core, and adjusting the assembling magnitude of interference of the mold core and the outer mold to meet C=0.45%*D; andat 510-530 DEG C, carrying out hot charging assembly on the mold core and the mold cover to obtain the outer mold, and then finishing the outer mold to a needed diameter. By changing the material ofthe mold cover and carrying out quenching thermal treatment on the mold cover, the strength of the mold cover can be improved greatly, and meanwhile, hot charging assembly on the mold core and the mold cover is carried out by means of a reasonable inlaying process to pre-tighten the expensive hard alloy mold core reliably so as to prevent early stage improper failure of the mold core, and finally,the dimensional stability of the cold-drawing outer mold is improved greatly and the service life of the cold-drawing outer mold is prolonged greatly.

Description

technical field [0001] The invention relates to a manufacturing method of a drawing die, in particular to a manufacturing method of a cold drawing outer die. Background technique [0002] At present, the mold casing of the cold-drawn outer mold used in the cold-drawing process of steel and other metals is generally made of No. 45 steel, and the mold core is made of tungsten steel. The core is interference fit, and the mold core sometimes cracks and is scrapped during drawing production, which affects the drawing efficiency and increases the production cost of the outer mold. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for making a cold-drawn outer mold in view of the deficiencies in the prior art. In this method, the strength of the mold sleeve is greatly improved by changing the material of the mold sleeve and performing quenching heat treatment on the mold sleeve. At the same time, through a reaso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C3/18B23P11/02C21D1/18B21C3/02
CPCB21C3/02B21C3/18B23P11/025C21D1/18
Inventor 胡云龙肖寒
Owner 浙江三基钢管有限公司
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