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A 750°C low-temperature carburizing process in a vacuum carburizing furnace for precision parts

A technology of vacuum carburizing and precision parts, which is applied in metal material coating process, solid-state diffusion coating, coating, etc., can solve the problems that the cost cannot be reduced, and the surface of metal parts cannot be kept clean, unable to maintain, etc., to achieve Improve the fatigue resistance, facilitate service use, and avoid the effect of secondary processing

Active Publication Date: 2021-05-18
刘小阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a 750°C low-temperature carburizing process in a vacuum carburizing furnace for precision parts. The parts produced by using it can achieve smaller dimensional deformation and have higher surface strength, which solves the traditional The temperature of the carburizing process in the vacuum carburizing furnace is above 860°C. The parts after carburizing and quenching treatment cannot achieve small deformation, maintain high dimensional accuracy or meet small tolerance requirements, and cannot reduce Subsequent processing, unable to reduce costs, the surface of metal parts cannot be kept clean after carburizing, quenching and tempering, and SPCC materials cannot be vacuum carburized and quenched at a temperature of 750 ° C.

Method used

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  • A 750°C low-temperature carburizing process in a vacuum carburizing furnace for precision parts
  • A 750°C low-temperature carburizing process in a vacuum carburizing furnace for precision parts
  • A 750°C low-temperature carburizing process in a vacuum carburizing furnace for precision parts

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Embodiment 1

[0034] A 750°C low-temperature carburizing process in a vacuum carburizing furnace for precision parts is as follows: Step 1. First, put the metal parts in the vacuum furnace and heat the vacuum furnace to 750°C. Then, input nitrogen into the vacuum furnace until the vacuum is reached. The air pressure in the furnace reaches 100 Pa, and the vacuum furnace continues to work at a constant temperature of 750°C and a constant pressure of 100 Pa for 30 minutes before stopping the input of nitrogen into the vacuum furnace.

[0035]In one of the embodiments, in step 2, the vacuum furnace is kept warm at a constant temperature of 750°C, and then, acetylene gas is input into the vacuum furnace, and the maximum pressure of the acetylene gas is maintained at 360 Pa, so that the acetylene gas can be kept at a constant temperature. Decomposition reaction occurs with the surface of metal parts with a temperature of 750 ° C. After the decomposition reaction on the surface of metal parts, carb...

Embodiment 2

[0045] A 750°C low-temperature carburizing process for precision parts in a vacuum carburizing furnace is as follows: Step 1: First, put the metal parts in the vacuum furnace, then heat the vacuum furnace to 750°C and maintain a constant temperature state, and then, input the metal parts into the vacuum furnace Nitrogen, until the air pressure in the vacuum furnace reaches 100Pa pressure, the vacuum furnace just enters the next step operation after 30 minutes with the constant air pressure that keeps the constant temperature of 750 ℃ ​​and 100Pa pressure.

[0046] In one of the embodiments, in step 2, the vacuum furnace is kept warm at a constant temperature of 750°C, and then, acetylene gas is input into the vacuum furnace, and the acetylene gas is input into the vacuum furnace in the form of pulses. For 2 minutes, the maximum pressure of acetylene gas input into the vacuum furnace is maintained at 360Pa; the vacuum furnace uses acetylene gas as the carburizing medium to carbu...

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Abstract

The vacuum carburizing furnace 750°C low-temperature carburizing process for precision parts of the present invention can realize carburizing treatment on metal parts at a temperature of 750°C, and the metal parts treated by the carburizing process can be uniform Infiltrated layer, higher quenching hardness, steeper infiltrated layer gradient and lower brittleness of metal parts after tempering and bending test, no surface peeling, peeling and fracture on the bending surface of metal parts phenomenon, the vacuum carburizing furnace using this process does not have intergranular oxidation during the carburizing process of metal parts, which can improve the fatigue resistance of the workpiece material, and the surface of the metal parts after carburizing and quenching will not produce black spots Carbon is beneficial to the subsequent electroplating process. In addition, there are no point-like or massive carbides and no residual austenite in the carburized layer of the parts produced by using it. The carburized layer and the matrix have the same Good bonding strength and good toughness, excellent organizational structure.

Description

technical field [0001] The invention relates to a 750°C low-temperature carburizing process in a vacuum carburizing furnace for precision parts. Background technique [0002] The traditional vacuum carburizing furnace has been widely used in the manufacturing industry, and the carburizing process temperature of the traditional vacuum carburizing furnace is above 860°C. However, with the rapid development of science and technology, the carburizing process of the traditional vacuum carburizing furnace can no longer meet the new requirements of modern industry. Some modern industrial products have the following new requirements for metal parts after carburizing: 1. For metal parts The manufacturing has higher precision requirements, for example, it is required to have less deformation after carburizing and quenching, so as to maintain higher dimensional accuracy or meet smaller tolerance requirements, reduce subsequent processing processes, and achieve the purpose of reducing c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/20C21D1/18C21D1/773
Inventor 刘小阳
Owner 刘小阳
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