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Die steel forging production method

A production method and technology of die steel, applied in the field of die steel forging production, can solve the problems of easy cracks on the surface and corners, product waste, and increase in product fires, etc., to improve metal plasticity, reduce axial tensile stress, The effect of reducing cracks

Active Publication Date: 2016-05-25
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When forging and producing die steel, the forging process generally adopts two upsetting and drawing, upper and lower flat anvil forging, and WHF forging method. Cracks are prone to appear on the surface and corners during forging, resulting in increased product fire times or too deep corner cracks, resulting in product scrap

Method used

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Embodiment Construction

[0018] The forging production method of die steel includes the following steps,

[0019] A. Preheat the forging tools; the heating temperature is 200~250℃, and the preheating time is not less than 6 hours. Preheating the forging tool can prevent the tool from absorbing heat, resulting in low surface temperature of the forged part, faster heat dissipation at the corner, and lower temperature, and corner cracks due to poor plasticity.

[0020] B. Making mold steel ingots.

[0021] C. For the first fire, the heating temperature is 1220°C, the final forging temperature is 860°C, and the forging time is 30 minutes. The forging method is directly upsetting on a large platform with an upsetting ratio of 2.2 or more, and then using the WHF forging method in the axial direction to draw the length to the square, and the reduction per pass is 20%.

[0022] D. For the second fire, the heating temperature is 1220°C, the final forging temperature is 860°C, and the forging time is 30 minutes. The f...

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Abstract

The invention discloses a die steel forging production method. The method includes the following steps that A, a forging die is preheated; B, a die steel ingot is manufactured; C, primary firing is conducted, a large platform is upset, and drawing is conducted through the WHF method; D, secondary firing is conducted, flatting is conducted first and then forging is conducted, side faces are trimmed, and the erecting and upsetting are conducted; E, tertiary firing and quartus firing are conducted, drawing, flatting and forging continue, and large faces and side faces are produced alternately. Large face pressing and side face trimming are conducted alternately. Metal plasticity is improved through recovery recrystallization, and corner cracks are prevented. The forging mode is optimized, ends enter an anvil and are pressed downwards and flatted reversely, axial tensile stress is reduced, and pull cracks of anvil connection portions are prevented.

Description

Technical field [0001] The invention relates to a forging production method of die steel, in particular to a forging method for H11 or H13 die steel. Background technique [0002] When forging and producing die steel, the forging process generally adopts two upsetting, upper and lower flat anvil forging, and WHF forging method. Cracks are prone to appear on the surface and corners during forging, which may cause more fires or excessive corner cracks to cause product waste. . Summary of the invention [0003] The technical problem to be solved by the present invention is to provide a die steel forging production method, which can reduce the cracks in the corners of the die steel. [0004] In order to solve the above technical problems, the technical solutions adopted by the present invention are: [0005] The forging production method of die steel includes the following steps, [0006] A. Preheat the forging tools; [0007] B. Making mold steel ingots; [0008] C. For the first fire, th...

Claims

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Application Information

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IPC IPC(8): B21J5/00
CPCB21J5/00
Inventor 王永军
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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