Cutting pick and preparation method thereof

A pick and intermediate frequency technology, which is applied in the field of parts manufacturing, can solve the problems of limited alloying effect, complicated process, and slow penetration rate of solid penetrating agent.

Active Publication Date: 2019-08-23
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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, t...

Method used

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  • Cutting pick and preparation method thereof
  • Cutting pick and preparation method thereof
  • Cutting pick and preparation method thereof

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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 cutting pick and a preparation method thereof and belongs to the field of part manufacturing. According to the cutting pick, a to-be-welded workpiece is heated and welded by comprehensively utilizing a skin effect, a proximity effect and annular effect in welding by means of medium frequency induction heating, so that the mechanical property of a weld joint is substantially equal to that of a cutting pick body. In the welding process, the preparation method has the characteristics of being capable of controlling the upsetting temperature precisely and eliminating interference of human factors to the welding quality to the maximum extent and being high in stability. Meanwhile, casting flaws and flash welding grey-spots are avoided during welding, so that the heatingefficiency is high. Medium frequency induction heating quenching has the advantages of being high in temperature control precision, uniform in hardened layer, relatively high in hardness, high in heating speed, high in production efficiency, little in oxidization and decarburization, pollution-free, low in energy consumption, low in cost and the like.

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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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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