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Strong toughening heat treatment process for GCr15 knife roll

A technology of strengthening and toughening, heat treatment equipment, used in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problem of insufficient strength and toughness of workpieces, and achieve the effects of improving impact toughness, service life and wear resistance.

Inactive Publication Date: 2018-06-12
QINGDAO XIAOMIXING ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a GCr15 knife roller strengthening and toughening heat treatment process in order to overcome the defects of insufficient strength and toughness of the workpiece after conventional GCr15 heat treatment and quenching, so as to improve the service life of the knife roller

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The material is GCr15 cutting knife roll, the weight of each knife roll is 100kg, and each furnace is equipped with 8 pieces. The heat treatment equipment used is a box-type multipurpose furnace with a heating power of 120KW. Studio size: 1500×750×750mm. The strengthening and toughening heat treatment process of GCr15 cutter roll is carried out according to the following steps:

[0016] (1) Solid solution: the workpiece is heated to 690°C for 1 hour and then heated to 1030°C for 1 hour. All carbides are completely dissolved in austenite, and the carbide components are homogenized, and then the workpiece is oil-cooled. Get supersaturated martensite;

[0017] (2) High-temperature tempering: The solid-solution workpiece is heated to 680 ° C for 2 hours and air-cooled to transform into sorbite, and the carbides are distributed in a spherical shape.

[0018] (3) Quenching: After processing, the workpiece is heated to 840°C and held for 1.5 hours, the structure is transfor...

Embodiment 2

[0021] This embodiment is the same as embodiment 1, the difference is: the workpiece described in the above-mentioned step (3) is first heated to 700° C. for 1 hour and then heated to 840° C. for 1.5 hours, and then oil-cooled.

Embodiment 3

[0023] This example is the same as Example 2, the difference is that: in step (1), the workpiece is heated to 700°C for 1 hour and then heated to 1040°C for 1 hour; in step (2), the solid solution workpiece is heated to 690°C ; In the step (3), the processed workpiece is first heated to 700° C. for 1 hour and then heated to 850° C. for 1.5 hours; in the step (4), it is heated to 250° C. for 2.5 hours and then air-cooled.

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PUM

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Abstract

The invention relates to a strong toughening heat treatment process for a GCr15 knife roll. The heat treatment process comprises the following steps that 1, solid solution is carried out, wherein a workpiece is placed into a furnace to be heated to 690-700 DEG C and is subjected to heat preservation for 1 hour, then the temperature is increased to 1040 + / - 10 DEG C and is kept for 1 hour, and thenthe workpiece is subjected to oil cooling; 2, high-temperature tempering is carried out, wherein the solid-soluble workpiece is heated to 690 + / - 10 DEG C, is subjected to heat preservation for 2 hours, and then is subjected to air cooling; 3, quenching is carried out, wherein the processed workpiece is heated to 850 + / - 10 DEG C, is subjected to heat preservation for 1.5 hours, and then is subjected to oil cooling; and 4, low-temperature tempering is carried out, the workpiece is heated to 250 + / - 10 DEG C, is subjected to heat preservation for 2-3 hours, and then is subjected to air cooling. A preferable scheme is that the processed workpiece in the step 3 is heated firstly to 700 DEG C, is subjected to heat preservation for 1 hour and then is heated to 850 + / - 10 DEG C. Compared with the prior art, the heat treatment process has the advantages that a carbide super-refining treatment method is adopted, so that material organization is improved, and the strength and toughness of a material are improved; and abrasion resistance of the knife roll processed by the process is improved by 7 times, the impact toughness is improved by 2 times, the service life is prolonged by 2-4 times,and the level of the knife roll reaches the level of an imported knife roll.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a GCr15 cutter roll strengthening and toughening heat treatment process. Background technique [0002] The cutting knife roller made of GCr15 is an important part of an imported mechanical equipment. The conventional GCr15 heat treatment and quenching process is as follows: the workpiece is heated to 850 ° C, and the oil is cooled after 0.5 hours of heat preservation; after cooling to room temperature, cold treatment is performed immediately, at -70 ° C Take it out after 2 hours of heat preservation; heat the workpiece to 250°C, heat it for 2 to 3 hours, and then take it out of the furnace to air cool. After the conventional heat treatment process, the hardness of the knife roller reaches 60-63HRC, but deformation, cracking and brittle fracture often occur, the strength and toughness are insufficient, the service life is short, and the heat treatment performance cannot meet the require...

Claims

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Application Information

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IPC IPC(8): C21D9/38
CPCC21D9/38
Inventor 曲立辉
Owner QINGDAO XIAOMIXING ELECTRONICS TECH CO LTD