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Cryogenic treatment method for ceramic/metal ceramic cutting tool

A cryogenic treatment and cermet technology, applied in the field of material heat treatment technology, can solve the problems of easy chipping, lack of systematic research on cryogenic technology, poor strength and toughness of ceramics or cermets, etc., to achieve good heat exchange effect and controllable treatment temperature. , the effect of controllable cooling speed

Inactive Publication Date: 2012-01-25
CHONGQING UNIV OF ARTS & SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The cryogenic treatment process has been widely used in high-speed steel cutting tools and hard alloy cutting tools, and can significantly improve the life of these two cutting tools. However, there is no systematic research on the cryogenic process of various cutting tools. Cold treatment, there is no research report at home and abroad, and the problems of poor toughness and easy chipping of ceramics or cermets also need to be solved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Will Al 2 o 3 After cleaning and wiping the ceramic-based knives, put them into a program-controlled cryogenic box, and set the process to start cryogenic treatment. The process is: first drop from room temperature to -100°C, cool at a rate of 1.5°C / min, and keep warm for 1h; then cool down To -150°C, the cooling rate is 2°C / min, and the temperature is kept for 24h. After cryogenic treatment, close the liquid nitrogen input valve and start heating and tempering: the tempering temperature is 100°C, the heating rate is 2°C / min, keep the temperature for 4h, and then cool down to room temperature naturally.

[0019] The cutting tool after the cryogenic process was installed on the machine tool, and the tool test experiment was carried out. The processing material was 35CrMnSiA, and the number of processed workpieces increased from 84 before cryogenic to 124, with an increase rate of 50%.

Embodiment 2

[0021] After cleaning and wiping the Ti(C,N)-based cermet tool, put it into a program-controlled cryogenic box, and set the process to start the cryogenic treatment. The process is: first drop from room temperature to -100°C, and the cooling rate is 1.5°C / min, keep warm for 1h; then cool down to -150℃, cooling rate is 2℃ / min, keep warm for 24h. After cryogenic treatment, close the liquid nitrogen input valve and start heating and tempering: the tempering temperature is 100°C, the heating rate is 2°C / min, keep the temperature for 4h, and then cool down to room temperature naturally.

[0022] The tool after the cryogenic process was installed on the machine tool, and the tool test experiment was carried out. The processing material was 20CrMnTiH, and the processed workpiece was a high-speed synchronizer gear sleeve. is 100%.

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Abstract

The invention provides a cryogenic treatment method for ceramic / metal ceramic cutting tools, which can be especially used by cutting tool users to improve the service life of all kinds of finished ceramic / metal ceramic cutting tools. The cryogenic treatment method is suitable for metal ceramic / ceramic cutting tool series such as alumina-based ceramic cutting tool series, silicon-nitride-based ceramic cutting tool series, coating ceramic cutting tool series, TiC-based metal ceramic cutting tool series and Ti(C, N)-based metal ceramic cutting tool series. The cryogenic treatment method is characterized in that when the finished ceramic / metal ceramic cutting tools are in a program-controlled cryogenic box, cooling and heating programs are strictly controlled, firstly the finished ceramic / metal ceramic cutting tools are cooled to liquid nitrogen temperature, i.e. negative 150 DEG C to negative 196 DEG C, heat preservation is conducted for 2-24 hours, then finished ceramic / metal ceramic cutting tools are tempered in the cryogenic box to 150-200 DEG C, heat preservation is conducted for 1-4 hours and finally the finished ceramic / metal ceramic cutting tools are cooled to room temperature together with a furnace. The cryogenic treatment method for ceramic / metal ceramic cutting tools has the advantages that the cost is low, the industrialized production is easy to realize and the overall service life of the treated finished ceramic / metal ceramic cutting tools is prolonged.

Description

technical field [0001] The invention belongs to the technical field of material heat treatment technology, and relates to the heat treatment of cutting tools, in particular to the cryogenic treatment method of ceramic / cermet finished blades. Background technique [0002] Cryogenic treatment, also known as ultra-low temperature treatment, refers to a treatment method in which the material is cooled to below -130°C to -196°C at a certain rate with a cooling medium, and after being frozen for a period of time, the material is heated to room temperature at a certain rate. Cryogenic treatment is widely used in the fields of ferrous metals, non-ferrous metals, metal alloys, carbides, plastics, silicates and other materials, which can significantly improve the mechanical properties and service life of materials, stabilize dimensions, improve uniformity, reduce deformation, and Easy to operate, no damage to the workpiece, no pollution, low cost, and has a good development prospect. ...

Claims

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Application Information

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IPC IPC(8): C04B41/80
Inventor 姜中涛邓莹李力陈慧涂铭旌古方乐
Owner CHONGQING UNIV OF ARTS & SCI
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