Production processing method for edge-digging scissors made of Cr12Mo1V1

A technology of cr12mo1v1 and processing method, applied in the field of cutting edge shears made of cold work die steel Cr12Mo1V1, can solve the problems of improper selection of heat treatment and tempering temperature, damage to internal stress balance, large amount of retained austenite, etc. Acceptance rate, grinding stress relief, tissue stress relief and thermal stress relief effects

Active Publication Date: 2013-09-25
TAIER HEAVY IND
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Problems solved by technology

However, after Cr12Mo1V1 is quenched, the amount of residual austenite in the structure is large, and the tempering temperature of heat treatment is not selected properly or the tempering is not sufficient. During subsequent wire cutting, the residual austenite is heated by discharge heating and cooled by coolant, and the surface layer is re-quenched and transformed into quenched. Martensite, volume expansion, forming tissue stress; wire cutting destroys the internal stress balance, releases the internal stress, and redistributes the stress. When the local internal stress exceeds the tensile strength of the material, it leads to cracking: that is, when the wire cuts the arc edge, it is extremely Easy to crack, so that the cutting edge shears are scrapped

Method used

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  • Production processing method for edge-digging scissors made of Cr12Mo1V1
  • Production processing method for edge-digging scissors made of Cr12Mo1V1

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Embodiment Construction

[0008] The production and processing method of the material Cr12Mo1V1 digging shears of the present invention, the specific steps are as follows: (1) Isothermal spheroidizing annealing of the forging: heat the forging at 850~870°C for about 4 hours, then cool it to 730~750°C for 5~ After 6 hours, it is cooled to below 500°C with the furnace and air-cooled, and its hardness is less than HB260. (2) Rough milling, flaw detection, component detection. (3) Stress relief and tempering: the workpiece is kept at 600°C for about 5 hours, then cooled to 500°C with the furnace and air-cooled; fine milling to the size before quenching. (4) Quenching and tempering: Heating before quenching adopts three stages of temperature rise: 550°C for 120 minutes, 850°C for 120 minutes, 1010°C for 110 minutes; then out of the furnace for oil quenching, the oil temperature must be kept at 60 Between -80°C, cool down to below 150°C, and after the oil is air-cooled to room temperature, immediately perfo...

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Abstract

The invention discloses a production processing method for edge-digging scissors made of Cr12Mo1V1. The production processing method comprises a first step of performing isothermal spheroidizing on a forged piece; a second step of performing rough milling, flaw detection and ingredient detection; a third step of performing destressing tempering, and performing finish milling to dimensions prior to quenching; a fourth step of performing quenching and tempering (enabling workpiece hardness to be HRC 58-62); a fifth step of performing coarse grinding, destressing tempering and semi-precision grinding; a sixth step of utilizing a low-speed wire to perform linear cutting on the arc cutting edge face, and performing precision grinding to obtain a finished product; and a seventh step of performing checking and oil coating, and placing the product in a warehouse. According to the method, cracking of an arc cutting edge during linear cutting can be avoided, and accordingly the edge-digging scissors production pass rate is guaranteed.

Description

technical field [0001] The invention relates to a production and processing method for making edge digging shears from cold working die steel Cr12Mo1V1. Background technique [0002] When using side digging shears to process cold-rolled steel plates, due to the high hardness of cold-rolled steel plates, side digging shears made of ordinary materials cannot cut the steel plate. At this time, it is necessary to use materials with high hardness and high wear resistance to make side digging shears , so use Cr12Mo1V1 as the material of digging edge shears. The commonly used production and processing methods of edge digging shears are: processing the blank to the size before quenching, quenching and tempering, then rough and fine grinding, and finally wire cutting on the cutting edge. However, after Cr12Mo1V1 is quenched, the amount of residual austenite in the structure is large, and the tempering temperature of heat treatment is not selected properly or the tempering is not suf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/40
Inventor 杨晓红马继堂贾文胜
Owner TAIER HEAVY IND
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