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Modified tempering furnace and tempering method

A tempering furnace, inert gas technology, applied in furnaces, heat treatment furnaces, furnace types, etc., can solve the problems of uneven tempering, mold oxidation, high price, and achieve good tempering effect, uniform hardness and low cost.

Inactive Publication Date: 2015-01-28
KUNSHAN YOUTEWEI HEAT TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tempering in air will cause mold oxidation, and the degree of oxidation will be more serious with the extension of tempering time or the increase of tempering temperature
[0011] In the second stage, the well-type furnace with atmosphere protection formed by dripping oil essence or kerosene can partially solve the oxidation problem and achieve the effect of anti-oxidation, but the effect is not ideal
Vacuum tempering can effectively avoid the problem of mold surface oxidation, but the vacuum degree has high requirements on equipment, and the price is too high, which is beyond the affordable range of ordinary enterprises, and it is not suitable for small batch mold tempering
At the same time, since the workpiece is in a vacuum state during tempering, the mold can only be heated by radiation, and the temperature difference between different positions in the furnace is large, which has a greater impact on large and medium parts, resulting in uneven tempering

Method used

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  • Modified tempering furnace and tempering method
  • Modified tempering furnace and tempering method
  • Modified tempering furnace and tempering method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 , an improved tempering furnace, comprising a common tempering furnace 1 (the inside is air during tempering), and a set of vacuum pumping equipment (vacuum pump) 2 and a set of inert gas charging equipment are installed on the furnace body of the tempering furnace 1.

[0039] The inert gas inflation equipment includes an inert gas compression bottle 3, and a safety valve 4, a decompression valve 5 and an inflation valve 6 sequentially arranged on its gas outlet pipeline.

[0040] The gas in the inert gas compression bottle is one of nitrogen, helium and argon.

[0041] In this example, cheap high-purity nitrogen is selected.

[0042] Use the improved tempering equipment to work, the tempering method is as follows:

[0043] First, the temperature of the tempering furnace rises from room temperature to 200°C within 30 minutes. During this process, start the vacuum equipment (vacuum pump) to evacuate the tempering furnace to remove air, and the vacuum d...

Embodiment 2

[0052] Utilize the improved tempering equipment in embodiment 1 to work, the tempering method is as follows:

[0053] First, the temperature of the tempering furnace rises from room temperature to 200°C within 30 minutes. During this process, start the vacuum equipment (vacuum pump) to evacuate the tempering furnace to remove air, and the vacuum degree is evacuated to 600pa.

[0054]Secondly, when the furnace temperature rises to 200°C, fill high-purity nitrogen into the furnace, and then start the circulating fan to heat up and temper. Add a trachea to the outlet of the nitrogen gas, and the trachea extends below the water surface, and judge by observing the speed at which the bubbles emerge. As long as the bubbles come out at a constant speed, it means that the inside is under positive pressure. Continue to heat up to 650°C and keep the temperature constant for 8 hours.

[0055] Finally, after tempering, the hot nitrogen gas is released, and when the nitrogen gas is refill...

Embodiment 3

[0057] Utilize the improved tempering equipment in embodiment 1 to work, the tempering method is as follows:

[0058] First, the temperature of the tempering furnace rises from room temperature to 200°C within 30 minutes. During this process, start the vacuuming equipment (vacuum pump) to evacuate the tempering furnace to remove air, and the vacuum degree reaches 800pa.

[0059] Secondly, when the furnace temperature rises to 200°C, fill high-purity nitrogen into the furnace, and then start the circulating fan to heat up and temper. Add a trachea to the outlet of the nitrogen gas, and the trachea extends below the water surface, and judge by observing the speed at which the bubbles emerge. As long as the bubbles come out at a constant speed, it means that the inside is under positive pressure. Continue to heat up to 620°C and keep the temperature constant for 7 hours.

[0060] Finally, release the hot nitrogen after tempering, and then fill it with nitrogen to cool to 200°C,...

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Abstract

The invention discloses a tempering method. The tempering method comprises the following steps: additionally mounting a vacuum extractor and an inert gas charging device on a common tempering furnace, and tempering and cooling a workpiece under a protective atmosphere, so as to prevent that the workpiece is oxidized by the oxygen in the air at high temperature, further obviously prolong the service life of the workpiece, and lower the production cost.

Description

technical field [0001] The invention specifically relates to an improved tempering furnace and tempering method, which are used to improve the service life of die-casting and plastic moulds. Background technique [0002] Tempering is to heat the workpiece to Ac 1 A certain temperature below, heat preservation for a certain period of time, and then cooling to room temperature heat treatment process. Tempering can make the workpiece obtain the required performance. [0003] Steel is rarely used directly after quenching, because the structure after quenching is martensite and retained austenite, and there is internal stress. Although martensite has high strength and hardness, it has poor plasticity and high brittleness. Deformation and cracking are easy to occur under the action; in addition, the structure is unstable after quenching, and can be slowly decomposed at room temperature, resulting in volume changes and resulting in deformation of the workpiece. Therefore, the qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/773C21D1/74C21D9/00
CPCC21D1/18C21D1/74C21D1/773C21D9/00
Inventor 沈业清沈业录
Owner KUNSHAN YOUTEWEI HEAT TREATMENT
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