Vacuum carbonization heat treatment machining process

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...

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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 carburizing heat treatment process, which has the advantages of high production efficiency, resource saving and production cost, and solves the above-mentioned problems. Questions raised in the background art

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