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A kind of pick and its preparation method

An intermediate frequency, induction heating technology, applied in the field of parts manufacturing, can solve the problems of high cost of metal salt bath equipment, limited effect of alloying, increased process complexity, etc., to eliminate welding quality interference, fast heating speed and low cost. Effect

Active Publication Date: 2021-06-22
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, there have been many related studies, but there is still the problem of poor wear resistance. For example, Chinese patent 200710156941.4 discloses the use of carbon powder to carburize, boronize, molybdenum, and chromium on the pick, and then perform salt bath and annealing. , Tempering treatment, the steps are complicated, the penetration rate of the solid penetration agent is slow and the penetration layer structure is uneven, so that the surface hardness of the product is not high and the quality is unstable; Chinese patent 200810123512.1 discloses that by pickling, carburizing, titanium, manganese Treatment, boronizing, tungsten, chromium salt bath, annealing treatment, tempering treatment, shot blasting treatment and other steps, the process is relatively complicated, the equipment cost of metal salt bath is high, the operation is complicated, and the effect of alloying is limited; Chinese patent 201510965644.9 discloses the use of kerosene as a carburizing medium to improve the carburizing process, but in this patent, the cooled pick after brazing is reheated for carburizing, and the pick is heated twice at high temperature, which increases the complexity of the process Moreover, after the carburizing process, a medium temperature tempering of about 400 ° C was carried out, resulting in a decrease in the hardness of the carburized layer and a decrease in wear resistance.

Method used

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  • A kind of pick and its preparation method
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  • A kind of pick and its preparation method

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preparation example Construction

[0025] The invention provides a kind of preparation method of cutting tooth, comprises the following steps:

[0026] The pick body and the hard alloy are welded by medium frequency induction heating to obtain parts;

[0027] The parts are subjected to intermediate frequency induction heating and quenching in sequence to obtain quenched parts;

[0028] performing intermediate frequency induction heating and tempering on the quenched parts and then air cooling to obtain tempered parts;

[0029] The tooth shank of the tempered part is sequentially subjected to intermediate frequency induction heating annealing and air cooling to obtain a pick.

[0030] In the invention, the pick body and the hard alloy are welded by medium-frequency induction heating to obtain parts. In the present invention, the cemented carbide preferably includes cemented carbide with a grade of YG4C, YG8C, ZD30 or ZD15 for geological and mining tools. In the present invention, there is no special limitatio...

Embodiment 1

[0045] The pick adopts 42CrMo as the alloy material of the pick body, and its heat treatment process parameters are: A 1 730°C, A 3 is 800°C and Ms is 310°C. The process steps are as follows: first place the pick on the tooling, make the intermediate frequency induction heating equipment surround the hard alloy head (hard alloy for YG4C geological and mining tools) and the end face of the pick shank to be welded, adjust the intermediate frequency induction between it and the welder The gap between the parts is 20mm, adjust the frequency of the intermediate frequency sensor to 5kHz, keep it for 30s after reaching the temperature, control the initial temperature of the top to 1250°C, the upsetting amount is 4mm, and the welding upsetting is completed within 6s after the heating stops. Then carry out overall induction heating and quenching on the pick, the heating frequency remains unchanged, keep it for 25s after reaching the temperature, spray liquid cooling after induction he...

Embodiment 2

[0047] The pick adopts 35CrMoV as the alloy material of the pick body, and its heat treatment process parameters are: A 1 at 700°C, A 3 is 835°C and Ms is 356°C. The process steps are as follows: first place the pick on the tooling, make the intermediate frequency induction heating equipment surround the carbide head (ZD15 cemented carbide for geological and mining tools) and the end face of the pick handle to be welded, adjust the intermediate frequency induction between it and the welder The gap between the parts to 20mm, adjust the frequency of the intermediate frequency sensor to 7kHz, and keep it for 30s after reaching the temperature. The initial temperature of the top is controlled to be 1280°C, the amount of upsetting is 3 mm, and the welding upsetting is completed within 8 seconds after the heating stops. Then carry out overall induction heating and quenching on the pick, keep the heating frequency unchanged, keep it for 23s after reaching the temperature, spray liq...

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Abstract

The invention provides a pick and a preparation method thereof, which belong to the field of part manufacturing. In the present invention, the intermediate frequency induction heating welding heats and welds the workpiece to be welded by comprehensively utilizing the skin effect, the proximity effect and the ring effect. It can eliminate the interference of human factors on welding quality to the greatest extent, and has the characteristics of high stability. At the same time, there will be no casting defects, no flash welding gray spots during welding, and high heating efficiency; medium frequency induction heating and quenching has high temperature control accuracy and hardened layer Uniform and high hardness, fast heating speed, high production efficiency, less oxidation and decarburization, no pollution, low energy consumption, low cost and other advantages.

Description

technical field [0001] The invention relates to the technical field of component manufacturing, in particular to a pick and a preparation method thereof. Background technique [0002] Picks are key components of construction machinery used in fields such as mineral mining, roadway excavation, road construction and maintenance. They are responsible for excavation and planing, and are components that directly contact the object to be constructed. They are subjected to severe impacts, wear, etc. Working conditions, therefore, picks are also vulnerable parts. The performance and service life of such components directly affect the progress and cost of projects in fields such as mineral mining, roadway excavation, road construction and maintenance. [0003] The production process of picks generally includes hot forging, machining, brazing, heat treatment, shot peening, quality inspection and other processes. In the part of heat treatment process, the complexity partly determines ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/10C21D1/26C21D1/667C21D9/22E21C35/18
CPCC21D1/10C21D1/26C21D1/667C21D9/22E21C35/18Y02P10/25
Inventor 袁志钟李绍伟罗锐程晓农郭顺韦家波杨成康陈乐利
Owner JIANGSU UNIV
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