Surface treatment technique for coal winning machine cutting bit

A surface treatment and shearer technology, applied in heat treatment baths, heat treatment equipment, metal material coating technology, etc., can solve problems affecting bonding strength, uneven welding, and affecting service life, so as to improve service life and work Efficiency, the effect of saving production costs

Inactive Publication Date: 2008-06-04
李明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the various types of traditional picks used in domestic coal mining machines are generally made of alloy steel inlaid with hard alloy, and the production cost is high.
One of its processing methods is to drill holes in the forged forgings, and fix the hard alloy by brazing, and then heat treatment and other processes. The picks made by this process are affected by uneven welding. The bonding strength, tooth tip shedding phenomenon is very serious, and the service life is not high; the other is the use of cast-in picks, which is to put cemented carbide in the mold cavity, and then pour molten iron to form it at one time, but the cast-in picks are Defects such as shrinkage porosity and inclusions are prone to occur during the casting process, which seriously affects the service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Put a U94 pick in the seepage box and place it in the heating trolley furnace, heat up to 650°C, keep it warm for 4 hours, then heat it up to 900°C, keep it warm for 8 hours, and cool it down to 850°C , after 2 hours of heat preservation, cool down to below 800°C and take out of the furnace. After cooling to room temperature, open the box to remove impurities on the surface of the pick;

[0021] (2) Put the above-mentioned pick into the infiltration box with boronizing agent accounting for 80.6%, molybdenum powder accounting for 3%, and chromium powder accounting for 16.4%. The infiltration box is placed in a heating furnace, heated to 650° C., and kept for 4 hours. Then heat it up to 900°C, keep it warm for 8 hours, cool it down to below 800°C, and take it out of the oven. After cooling to room temperature, open the box to remove impurities on the surface of the pick;

[0022] (3) Add 73% barium oxide, 22% non-iodine refined salt, and 5% salt bath deoxidizer in the...

Embodiment 2

[0026] (1) Put a type of pick U84 in the seepage box and place it in the heating trolley furnace, heat up to 650°C, keep it warm for 4 hours, then heat it up to 900°C, keep it warm for 8 hours, and cool it down to 850°C , after 2 hours of heat preservation, cool down to below 800°C and take out of the furnace. After cooling to room temperature, open the box to remove impurities on the surface of the pick;

[0027] (2) Put the above-mentioned pick into the infiltration box with boronizing agent accounting for 82%, molybdenum powder accounting for 2%, and chromium powder accounting for 16%. The infiltration box is placed in a heating furnace, heated to 650° C., and kept for 4 hours. Then heat it up to 900°C, keep it warm for 8 hours, cool it down to below 800°C, and take it out of the oven. After cooling to room temperature, open the box to remove impurities on the surface of the pick;

[0028] (3) Add 72% barium oxide, 24% non-iodine refined salt, and 4% salt bath deoxidizer in...

Embodiment 3

[0032] (1) Put a type U95 pick in the seepage box and place it in the heating trolley furnace, raise the temperature to 650°C, keep it for 5 hours, then heat it up to 900°C, keep it for 9 hours, and cool it down to 850°C , after 2 hours of heat preservation, cool down to below 800°C and take out of the furnace. After cooling to room temperature, open the box to remove impurities on the surface of the pick;

[0033] (2) Put the above-mentioned pick into the infiltration box with boronizing agent accounting for 78%, molybdenum powder accounting for 4%, and chromium powder accounting for 18%. The infiltration box is placed in a heating furnace, heated to 650° C., and kept for 5 hours. Then heat it up to 900°C, keep it warm for 9 hours, cool it down to below 800°C, and take it out of the oven. After cooling to room temperature, open the box to remove impurities on the surface of the pick;

[0034] (3) Add 74.5% barium oxide, 20% non-iodine refined salt, and 5.5% salt bath deoxidiz...

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Abstract

The invention discloses a surface treatment technology for a cutting bit of a coal winning machine. The cutting bit is made of the 35 chrome molybdenum vanadium alloy structural steel; the surface treatment technology includes the carburizing treatment, the boronizing, molybdenum permeating and chromizing treatment in which the optimal proportioning of the ingredients in a permeating box is that the boronizing agent is 80.6 percent, the molybdenum powder is 3 percent and the chrome powder is 16.4 percent, the salt bath treatment in which the optimization proportioning of the ingredients in a salt bath furnace is that the baryta is 73 percent, the non-iodized refined salt is 22 percent and the salt bath deoxidizing agent is 5 percent and the annealing and tempering treatment. The cutting bit which is treated according to the technology of the invention has the Rockwell hardness higher than HRC62 and the service life more than 400 hours.

Description

technical field [0001] The invention relates to a surface treatment process, in particular to a surface treatment process of a cutting tool. Background technique [0002] The pick is an important part of the shearer, and it is also the most consuming and easily damaged part on the shearer. At present, the various types of traditional picks used by domestic coal mining machines are generally made of alloy steel inlaid with hard alloy, and the production cost is high. One of its processing methods is to drill holes in the forged forgings, and fix the hard alloy by brazing, and then heat treatment and other processes. The picks made by this process are affected by uneven welding. The bonding strength, tooth tip shedding phenomenon is very serious, and the service life is not high; the other is the use of cast-in picks, which is to put cemented carbide in the mold cavity, and then pour molten iron to form it at one time, but the cast-in picks are Defects such as shrinkage poro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C21D1/78E21C35/18C23C8/66C23C8/70C23C10/54C21D1/46C21D1/18C21D1/26C22C38/24
Inventor 李明
Owner 李明
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