Vacuum carbonization heat treatment machining process

A processing technology, vacuum carburizing technology, applied in the direction of metal material coating technology, coating, solid diffusion coating, etc., to achieve the effect of increasing the pressure in the furnace, improving the carburizing efficiency and shortening the heating time

Pending Publication Date: 2020-02-28
SHANGHAI FENGDONG HEAT TREATMENT ENGINEERING CO LTD
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Problems solved by technology

[0004] Aiming at the deficiencies in the actual production process of the existing vacuum carburizing process proposed in the background technology, the present invention provides a vacuum carburizin

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  • Vacuum carbonization heat treatment machining process

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] see figure 1 , a vacuum carburizing heat treatment process, comprising the following steps:

[0026] S1. Clean the parts and load them into the furnace; for the grease and other dirt on the surface of the parts, organic solvents or special cleaning agents can be used.

[0027] S2. Vacuum the furnace and heat the parts in the furnace. The heating temperature is 930-950°C. After heating to the set temperature, the temperature is maintained for 30 minutes...

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Abstract

The invention relates to the technical field of metal surface heat treatment, and discloses a vacuum carbonization heat treatment machining process. The internal of a furnace is vacuumized, and partsin the furnace are heated; the heating temperature is 930-950 DEG C; after the parts are heated to a set temperature, the temperature is homogenized by 30 min; carbonization gas is introduced in the furnace in a pulse form, and is maintained at a constant temperature of 930-950 DEG C; in a dispersion phase, the internal of the furnace is firstly vacuumized; then, nitrogen is injected in the furnace to reach the gas pressure in the furnace of not higher than 80 Pa for constant-temperature maintenance; and the internal of the furnace is vacuumized after maintenance. The low-pressure protective nitrogen is injected in the furnace in the carbonization dispersion phase, so that the pressure can be provided into the furnace to improve the dispersion efficiency, and high-concentration carbon content nearby the surfaces of parts is prevented; and under the condition of maintaining the carbonization temperature and the carbonization concentration in the furnace, the pressure in the furnace is increased, the carbonization efficiency is improved, the dispersion time is shortened, the production efficiency is improved, and the setting contradiction problems among the carbonization temperature,the carbonization concentration and the carbonization efficiency are effectively solved.

Description

technical field [0001] The invention relates to the technical field of metal surface heat treatment, in particular to a vacuum carburizing heat treatment process. Background technique [0002] Vacuum carburizing technology, also known as low-pressure carburizing technology, is a process in which carburizing media (such as high-purity acetylene) are introduced into a high-temperature furnace in a pulsed manner under low-pressure vacuum for rapid carburizing. Carburizing heat treatment is mostly used to increase the carbon content on the surface of steel parts. After quenching and low-temperature tempering, the surface of the parts can have high hardness and wear resistance, while the core of the parts still maintains the toughness and plasticity of low-carbon steel. . Its principle includes the decomposition, absorption and diffusion of carburizing gas. The process generally includes: parts cleaning-parts loading, furnace feeding-furnace vacuuming-furnace heating, uniform te...

Claims

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Application Information

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IPC IPC(8): C23C8/22C21D1/18
CPCC23C8/22C21D1/18
Inventor 王安民
Owner SHANGHAI FENGDONG HEAT TREATMENT ENGINEERING CO LTD
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