Method for manufacturing high-hardness and high-abrasion-resistant pre-bending machine lower die

A high wear resistance, pre-bending machine technology, applied in the direction of manufacturing tools, metal processing equipment, forming tools, etc., can solve the problems of hardness and wear resistance that cannot meet the requirements, large deformation, cracks on the surface, etc., and achieve cost performance High, increased hardness, and the effect of reducing the possibility of cracking

Active Publication Date: 2012-07-18
马鞍山博新高科产业服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention aims to overcome the disadvantages of the prior art that the hardness and wear resistance of the lower mold of the pre-bending machine cannot meet the requirements, and the deformation after quenching is relatively large, and the surface is prone to cracks, and provides a pre-bending machine with high hardness and high wear resistance. The method of lowering the mold of the machine adopts the method of the present invention, the mold is not easy to crack after heat treatment, the hardness meets the requirements, and the wear resistance is good, and the mold is cost-effective

Method used

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  • Method for manufacturing high-hardness and high-abrasion-resistant pre-bending machine lower die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A kind of method of manufacturing high hardness, high wear resistance pre-bending machine lower mold of this embodiment, its specific production steps are:

[0046] (1) Preparation of raw materials for the lower die of the pre-bending machine: the forging blank meeting the requirements of the present invention, its components are calculated by weight percentage: C: 0.38-0.45%, Si: 0.17-0.37%, Mn: 0.50-0.80%, S: ≤0.035%, P: ≤0.035%, Cr: 1.70-2.20%, Ni: ≤0.030%, Cu: ≤0.030%, Mo: 0.15-0.25%, and the rest is Fe. The forging used in this example Blank, its composition by weight percentage is: C: 0.41%, Si: 0.25%, Mn: 0.65%, S: 0.030%, P: 0.028%, Cr: 2.00%, Ni: 0.030%, Cu: 0.030% , Mo: 0.20%, the rest is Fe;

[0047] (2) Annealing treatment of forged blanks: anneal the forged blanks in step (1) through an annealing furnace to reduce hardness and improve cutting performance. The annealing temperature is 760°C and the annealing time is 5 hours. After cooling to 400°C in the f...

Embodiment 2

[0054] A kind of method of manufacturing high hardness, high wear resistance pre-bending machine lower mold of this embodiment, its specific production steps are:

[0055] (1) Preparation of raw materials for the lower die of the pre-bending machine: the forging blank used in this example has the following components by weight percentage: C: 0.45%, Si: 0.37%, Mn: 0.80%, S: 0.030%, P: 0.028%, Cr: 2.10%, Ni: 0.030%, Cu: 0.030%, Mo: 0.25%, and the rest is Fe;

[0056] (2) Annealing treatment of forged blank: anneal the forged blank in step (1) through an annealing furnace to reduce hardness and improve machinability. The annealing temperature is 770°C, and the annealing time is 4 hours. After cooling to 400°C in the furnace, air cooling is carried out. At this time, the hardness of the forged blank is HB 245;

[0057] (3) Preliminary processing of the forging blank: After step (2) annealing treatment, the forging blank is made into a workpiece with a single-sided allowance. Cut...

Embodiment 3

[0063] A kind of method of manufacturing high hardness, high wear resistance pre-bending machine lower mold of this embodiment, its specific production steps are:

[0064] (1) Preparation of raw materials for the lower die of the pre-bending machine: the forging blank used in this example has the following components by weight percentage: C: 0.38%, Si: 0.17%, Mn: 0.50%, S: 0.030%, P: 0.028%, Cr: 2.20%, Ni: 0.030%, Cu: 0.030%, Mo: 0.15%, and the rest is Fe;

[0065] (2) Annealing treatment of forged blanks: anneal the forged blanks in step (1) through an annealing furnace to reduce hardness and improve cutting performance. The annealing temperature is 750°C and the annealing time is 6 hours. After cooling to 400°C in the furnace, air cooling is carried out. At this time, the hardness of the forged blank is HB 220;

[0066] (3) Preliminary processing of the forging blank: After step (2) annealing treatment, the forging blank is made into a workpiece with a single-sided allowanc...

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Abstract

The invention discloses a method for manufacturing a high-hardness and high-abrasion-resistant pre-bending machine lower die, which belongs to the technical field of machining methods for pre-bending machine lower dies. The method includes steps of (1), preparing raw materials of the pre-bending machine lower die; (2), annealing a forged blank; (3), primarily machining the forged blank; (4), conditioning the pre-bending machine lower die, quenching the pre-bending machine lower die by water or oil after the pre-bending machine lower die is kept at the temperature ranging from 830 DEG C to 850 DEG C for 3 hours, and then tempering the pre-bending machine lower die under the condition of the temperature ranging from 680 DEG C to 700 DEG C; (5), realizing deep processing of the pre-bending machine lower die; and (6), realizing heat treatment of the pre-bending machine lower die, dipping an arc surface R of the pre-bending machine lower die into quenching media for cooling at first during quenching, and then dipping the complete pre-bending machine lower die into the quenching media after the arc surface R is cooled in the quenching media for 4 minutes to 6 minutes. The raw materials of the forged blank include from 1.70 to 2.2% of Cr. The pre-bending machine lower die is low in final deformation, high in hardness and fine in abrasion resistance, and does not crack during the heat treatment, and the surface cannot sink even if the pre-bending machine lower die bears extremely high pressure during usage.

Description

technical field [0001] The invention relates to the technical field of processing methods for a lower die of a pre-bending machine, and more specifically, relates to a method for manufacturing a lower die of a pre-bending machine with high hardness and high wear resistance. Background technique [0002] The sheet metal pre-bending machine is a machine that can pre-bend the sheet, and it is widely used in the field of sheet metal processing. At present, columnar or cylindrical metal bending parts required in industry or construction, such as large-diameter tower rods in electric power towers, are mostly made of iron plates that are bent and welded through seams. Since the sheet metal is generally large and requires high processing precision, during the bending process, the two sides of the sheet metal should be pre-bent first, and then bent into a cylindrical shape with a bending machine after pre-bending at a certain angle. . [0003] The lower mold of the pre-bending mach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D37/20
Inventor 刘孝俊
Owner 马鞍山博新高科产业服务有限公司
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