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Heat treatment reinforcement process for plasma arc

A technology of plasma arc and plasma arc, which is applied in the field of plasma arc heat treatment strengthening technology, can solve the problems of many production processes and high production costs, and achieve the effects of saving processes, increasing service life and increasing processing speed

Inactive Publication Date: 2012-07-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a plasma arc heat treatment intensification process using plasma arc to heat treat the pot edge, so as to solve the problems in the prior art that after the frying pan is pressure formed, the pot edge is flanged and the production process is many, and the production cost is high

Method used

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  • Heat treatment reinforcement process for plasma arc

Examples

Experimental program
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Effect test

Embodiment 1

[0026] For a wok with a 200 mm diameter rim, a nozzle diameter of 2.5 mm, a current of 25 amperes, a scanning speed of 28 mm / sec, a plasma arc length of 4.5 mm, and an argon flow rate of 0.3 cubic meters per minute are used for the wok. The pot is subjected to plasma arc heat treatment along the upper plane. The plasma arc makes the surface of the workpiece reach the melting temperature of the material. The heat treatment time is 30 seconds, and the crystal grains are refined by self-cooling to achieve surface quenching.

[0027] The pressure deformation test of the wok after the treatment shows that compared with the conventional treatment technology, the deformation resistance is equivalent, the heat treatment speed is increased by 30%, and the production cost is reduced. The surface hardness of the rim of the wok is HB=180, and the thickness of the surface hardening layer is 2 mm.

Embodiment 2

[0029] For a frying pan with a 250 mm diameter rim, a nozzle diameter of 3 mm, a current of 20 amperes, a scanning speed of 25 mm / sec, a plasma arc length of 4 mm, and an argon flow rate of 0.2 cubic meters per minute are used for the frying pan. The pot is subjected to plasma arc heat treatment along the upper plane. The plasma arc makes the surface of the workpiece reach the melting temperature of the material. The heat treatment time is 35 seconds, and the crystal grains are refined by self-cooling to achieve surface quenching.

[0030] The pressure deformation test is performed on the wok after the treatment. Compared with the conventional treatment technology, the deformation resistance is equivalent, the heat treatment speed is increased by 30%, and the production cost is reduced. The surface hardness of the rim of the wok is HB=150, and the thickness of the surface hardening layer is 0.5 mm.

Embodiment 3

[0032] For a wok with a 300 mm diameter rim, a nozzle diameter of 3 mm, a current of 30 amperes, a scanning speed of 40 mm / sec, a plasma arc length of 5 mm, and an argon gas flow rate of 0.5 cubic meters per minute are used for the wok. The pot is subjected to plasma arc heat treatment along the upper plane. The plasma arc makes the surface of the workpiece reach the melting temperature of the material. The heat treatment time is 40 seconds, and the crystal grains are refined by self-cooling to achieve surface quenching.

[0033] The pressure deformation test of the wok after the treatment shows that compared with the conventional treatment technology, the deformation resistance is equivalent, the heat treatment speed is increased by 30%, and the production cost is reduced. The surface hardness of the rim of the wok is HB=200, and the thickness of the surface hardening layer is 1 mm.

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Abstract

The invention relates to the field of plasma application, in particular to a heat treatment reinforcement process for a plasma arc. According to the heat treatment reinforcement process, the surfaces of workpieces are subjected to heat treatment by using the plasma arc for 30 to 40 seconds, the diameter of a spray nozzle is between 2 and 3 millimeters, the current is between 20 and 30 amperes, the scanning speed is between 25 and 30 millimeters / second, the length of a plasma electric arc is between 4 and 5 millimeters, the flow of argon is between 0.2 and 0.5 cubic meter / minute, and the surfaces of the workpieces reach the melting temperature of materials by the plasma electric arc. The heat treatment reinforcement process has the advantages of saving processes and production cost along with simplicity of operation and the like. The plasma arc is a compressive direct-current electric arc with high temperature and high energy; the surfaces of the workpieces are hardened by utilizing high-temperature jet flow beams of the plasma arc and are cooled to fulfill the aim of surface quenching, so that the surface hardness HB is more than or equal to 130, and the thickness of a surface hardening layer is between 0.5 and 2 millimeters. The invention has the advantages that: the metal surface-hardening treatment of the plasma arc has thick hardening layers, high treatment quality, high treatment efficiency, is low in running cost and the like.

Description

Technical field [0001] The present invention relates to the field of plasma application, in particular to a plasma arc heat treatment strengthening process. Background technique [0002] The wok with the 200 mm diameter rim is deformed during rapid cooling and rapid heating after pressure forming. At present, flanging of the pot is usually used to solve the deformation problem, but the production process is increased, and the production cost is correspondingly increased, and the production process is very complicated. Therefore, a process with simple treatment process and good treatment effect is needed. [0003] Plasma arc processing is a special processing method that uses the heat energy of plasma arc to cut, weld and spray metals or non-metals. In 1955, the United States first studied the successful plasma arc cutting. The principle of generating plasma arc is: let the arc of continuous ventilating discharge pass through a nozzle hole to produce a mechanical compression effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/09
Inventor 龙康王胜刚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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