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Hot forging process of mould

A technology of hot forging and mold, applied in the direction of metal processing equipment, etc., can solve problems such as mold failure, unusability, rapid crack expansion, etc., to achieve the effect of improving willfulness and internal structure

Inactive Publication Date: 2017-12-08
JIANGSU SUNWAY PRECISION FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the mold made of Cr12 steel is prone to cracks after being put on the machine, and the cracks will expand rapidly during continuous use, which will eventually cause the mold to fail and cannot be used

Method used

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Embodiment Construction

[0018] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be described in further detail below in conjunction with specific embodiments.

[0019] The hot forging process of a kind of mold provided by the present invention is described in further detail below,

[0020] In the embodiment of the present invention, its specific processing technology is successively as follows:

[0021] 1. Cutting: Prepare the bar material made of Cr12 steel.

[0022] 2. Billet making: the scale and fine cracks on the surface of the bar are removed by turning to obtain a bar-shaped billet with a high-quality surface.

[0023] 3. Pre-forging heat treatment: use a heating furnace to heat the rod-shaped blank. In this embodiment, the pre-forging heat treatment is divided into three stages. The specific temperature control is: install the furnace at 200-250°C, Heated to 650°C within 1 hour and held for 1-2 h...

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Abstract

The invention provides a hot forging process of a mould. The process comprises the following steps that blanking is performed, specifically, bars of Cr12 steel are prepared; billets are manufactured, specifically, scale cinders and fine cracks on the surfaces of the bars are removed in a turning manner, so that bar billets with the high-quality surfaces are obtained; heat treatment is performed before forging, specifically, a heating furnace is used for heating the bar billets, so that stress of the billets is removed; forging is performed, specifically, hot forging equipment is used for forging the bar billets, so that a mould in a predetermined shape is obtained; quenching is performed, specifically, a quenching furnace is used for quenching the mould, wherein the quenching oil temperature is 1080-1150 DEG C, and the quenching duration is 10-15 minutes; primary tempering is performed, specifically, the heating furnace is used for heating the mould to 480-500 DEG C, heat preservation is performed for 2-2.5 hours, and then the mould is taken out of the furnace to be naturally cooled; subzero treatment is performed, specifically, a cooling device is used for cooling the mould to minus 198 DEG C, and heat preservation is performed for 2-2.5 hours; and secondary tempering is performed, specifically, the mould is heated to 400 DEG C, heat preservation is performed for 24 hours, and then the mould is taken out of the furnace to be naturally cooled.

Description

technical field [0001] The invention relates to the field of die processing, in particular to a hot forging process for dies. Background technique [0002] Cr12 steel belongs to ledeburite steel, which has good hardenability, is not easily deformed by heat treatment, and has good wear resistance. Cr12 steel is an ideal material for forging dies. [0003] However, the carbon content of Cr12 steel is relatively high, and the carbon contains a large amount of alloy carbides. After forging, the carbides are distributed in bands, and the larger the diameter of the forged profile, the thicker the carbides and the more banded distribution. serious. Therefore, use the die made of Cr12 steel to easily produce cracks after being put on the machine, and in the process of continuing to use, the cracks expand rapidly, eventually causing the die to fail and cannot be used. [0004] The root cause of cracks is that the microstructure of the material inside the mold is not ideal, and the ...

Claims

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Application Information

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IPC IPC(8): B21J1/06B21J5/00C21D8/00
CPCB21J1/06B21J5/00C21D8/005
Inventor 杨山岭管仁卫朱丛林倪亚玲
Owner JIANGSU SUNWAY PRECISION FORGING
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