High speed steel tool heat treatment method

A heat treatment method and high-speed steel technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of poor red hardness of high-speed steel tools, unsatisfactory energy saving and production cost, multiple tempering cryogenic temperatures, etc.

Inactive Publication Date: 2010-04-14
SHANGHAI DIANJI UNIV
View PDF0 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the traditional heat treatment process, the red hardness (hardness performance at high temperature of cutting) of high-speed steel cutting tools is poor
Although the cryogenic treatment process can achieve high ha

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Made of W6Mo5Cr4V2 high speed steel Machine taps. The heat treatment process is: quenching (heating temperature 1200-1240 ° C for 2 hours, secondary quenching at 600-650 ° C and 500-550 ° C to room temperature) → low temperature tempering (80-100 ° C low temperature tempering for 1 hour )→-110~-90℃ cold treatment for 2~3 hours→finally tempering at 550±10℃ for 1 hour;

[0021] The comparative experiment adopts the traditional process (one quenching and three tempering) and cryogenic treatment process.

[0022] The processed taps are installed on the drill floor. The processed material is 40Cr steel, the hardness is 190HB, the cutting speed is 5.2m / min, the cutting depth is 6mm, and the flow rate of coolant (emulsion) is 5L / min. After testing it was found that: The high-speed steel tap uses the traditional process to process an average of 45.2 holes, an average of 62.2 holes after cryogenic treatment, and an average of 61.8 holes after cold treatment. It can be seen...

Embodiment 2

[0024] Made of W18Cr4V high speed steel Twist drill bit. The heat treatment process is: quenching (heating temperature 1260-1300 ° C for 2 hours, secondary quenching at 600-650 ° C and 500-550 ° C to room temperature) → low temperature tempering (80-100 ° C low temperature tempering for 1 hour) →-120~-80℃ cold treatment for 2~3 hours; finally tempering at 550±10℃ for 1.5 hours;

[0025] The comparative experiment adopts the traditional process (one quenching and three tempering) and cryogenic treatment process.

[0026] The treated twist drill bit is installed on the drill floor of Z305 drilling machine. The processed material is 1Cr18Ni9Ti stainless steel, the hardness is 200HB, the cutting speed is 4.8m / min, the drilling depth is 7mm, and the coolant flow rate is 5L / min. After testing it was found that: The twist drill can process 27.8 holes without cold treatment, 40.2 holes after cryogenic treatment, and 39.9 holes after cold treatment. It can be seen that the service...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a high speed steel tool heat treatment method and the method specifically includes the following steps: high-temperature step quenching steel materials to be treated in a quenching medium at the temperature of 1200-1310 DEG C; after quenching, cooling to room temperature and then low-temperature tempering for 1h at the temperature of 80-100 DEG C; cold treating for 2-3h at the temperature of minus 120-minus 80 DEG C; and finally tempering for 1-1.5h at the temperature of 540-560 DEG C, wherein the quenching medium is selected from calcium chloride saturated water solution, polyglycol water solution, polyving akohol water solution or potassium permanganate quenching liquid. The high speed steel tool heat treatment method is simple in process and saves energy, and compared with traditional technology, the mechanical performance and service life of the high speed steel tool are improved by around 20-40 percent.

Description

technical field [0001] The invention relates to a heat treatment method for steel materials, in particular to a heat treatment method for high-speed steel cutting tools. Background technique [0002] At present, the high-speed steel cutting tools widely used in my country are mainly tungsten-based W18Cr4V (abbreviated as 18-4-1) steel and tungsten-molybdenum-based W6Mo5Cr4V2 (abbreviated as 6-5-4-2) steel. There are two main heat treatment processes for these two steels: one is the traditional heat treatment process: after high temperature quenching, it needs to be tempered three times within the first hardening range; the other is cryogenic treatment process: high temperature quenching, one tempering and then put into cryogenic medium (Liquid nitrogen at -196°C) for a period of time and then tempered two to three times. With the traditional heat treatment process, the red hardness (hardness performance at high temperature of cutting) of high-speed steel cutting tools is po...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C21D9/22
Inventor 陆卫倩
Owner SHANGHAI DIANJI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap