Gas stove outer circulation cooling method of double chamber atmosphere pressure hardening furnace and cooling system thereof

A technology of external circulation cooling and gas circulation, applied in the field of metal quenching, can solve the problems of uneven cooling of the workpiece, easy deformation of the workpiece, large consumption of liquid nitrogen, etc. volume reduction effect

Inactive Publication Date: 2008-05-21
NORTHEASTERN UNIV
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Problems solved by technology

The main problem of this kind of quenching furnace is that the consumption of liquid nitrogen is huge, the waste is extremely serious, which greatly increases the production cost, and because the workpiece is not cooled uniformly, the workpiece is prone to deformation, and its qualified rate is relatively low

Method used

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  • Gas stove outer circulation cooling method of double chamber atmosphere pressure hardening furnace and cooling system thereof

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Effect test

Embodiment 1

[0017] A company mainly produces various high-speed steel knives. The knife body is made of Q235B ordinary carbon structural steel, and the blade is made of W18Cr4V high-speed steel. The two materials are combined by brazing, and the solder is made of brass. The hardness and mechanical properties of the W18Cr4V high-speed steel blade. The quenching equipment adopts a double furnace atmospheric pressure gas quenching furnace. The overall size of the quenching furnace is 6500mm×2800mm×2500mm (length×width×height). Part ξ≤20mm, the workpiece 3 is placed on the bracket made of Q235B structural steel, the loading capacity of each furnace is about 200kg, the quenching temperature is 1260℃~1280℃, and the consumption of liquid nitrogen per furnace is about 700~800L before improvement. The annual cost of liquid nitrogen exceeds 4 million yuan, and the product qualification rate is only about 92%. In order to reduce the consumption of liquid nitrogen and improve the pass rate, on the ba...

Embodiment 2

[0019] A company has newly launched a high-speed steel mechanical tool production line. The tool body is made of Q235B ordinary carbon structural steel or 16Mn low-alloy structure. The tool head is made of W18Cr4V or W9Mo3Cr4V high-speed steel. The two materials are combined by brazing. A good tool needs quenching heat treatment to improve the hardness and mechanical properties of the high-speed steel blade. The quenching equipment adopts a double-furnace atmospheric pressure gas quenching furnace. Placed on a bracket made of Q235B structural steel, the loading capacity of each furnace is about 150kg, and the quenching temperature is 1240℃~1280℃.

[0020] Adopt the cooling system described in the present invention in the design, the nitrogen outlet of the top of the cooling chamber in this system is connected with the heat exchanger, and the outlet of the heat exchanger is connected in parallel with the outlet pipe of the liquid nitrogen storage tank 11, and the main pipe after...

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Abstract

A gas furnace external circulation cooling method and a cooling system of a double-chamber constant-pressure quenching furnace belongs to the metal quenching field; aiming at the defects of wasting nitrogen with the prior art, the invention provides a method by which the high-temperature nitrogen is discharged from the top of the quenching furnace to be introduced into a heat exchanger out of the furnace for cooling; and then the nitrogen is mixed with the liquid nitrogen from a liquid nitrogen storage tank to participate in the quenching process and the circulation of the gas out of the furnace; the system which implements the method is that the nitrogen outlet at the top of a cooling chamber is connected with the heat exchanger and the outlet of the heat exchanger is connected with the outlet pipe of the liquid nitrogen storage tank in parallel; the main pipe after the parallel connection is connected with the air intake of a convergent divergent channel which is arranged on the cooling chamber; the outlet of the convergent divergent channel is connected with a nozzle to form a gas circulation cooling system; the inlet of a heat exchanging pipe in the heat exchanger is connected with a water pump or a fan and the inlet of the water pump is connected with a water tank; the inlet of the fan is arranged in the atmosphere to form circulation cooling system; the liquid nitrogen storage tank is connected with the parallel main pipe to form a medium supply system. The invention is characterized by saving nitrogen and high-quality quenching.

Description

technical field [0001] The invention belongs to the field of metal quenching, in particular to a gas furnace external circulation cooling method of a double-chamber atmospheric pressure quenching furnace. Background technique [0002] Currently widely used gas quenching thermal equipment, in addition to high-pressure vacuum quenching furnace, double-chamber normal pressure gas quenching furnace is the most common, this quenching furnace includes a heating furnace chamber and a gas cooling furnace chamber, two furnace chambers There is a movable furnace door between them. The heating furnace chamber generally adopts the carbon rod resistance heating method, and the protective gas is filled into the furnace chamber during the heating process to avoid oxidation of the workpiece surface. After the workpiece is heated and kept warm, the furnace door between the two furnace chambers is opened to allow the workpiece to enter the cooling furnace chamber for rapid cooling. The cooli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/62C21D9/00
Inventor 冯明杰陈文仲王春花
Owner NORTHEASTERN UNIV
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