A gas nitriding furnace gas flow diversion circulation method and device

Abstract

The invention discloses an airflow diversion circulating method and device for a gas nitriding furnace. Diversion mechanisms are arranged on a dome bucket; a vane wheel is arranged on a dome cap, and is connected with a motor; a gas coil is arranged on the dome bucket, and is connected with a gas disk; gas holes are formed in the gas disk; a gas guide ridge is arranged on the inner wall of the dome bucket; the gas direction in the dome bucket is changed by arranging the air guide ridge on the inner wall of the dome bucket; and difference between internal pressure and external pressure of the dome bucket is generated under the action of a centrifugal force generated by rotary vanes, so that airflow enters the dome bucket from the bottom and is thrown from the outer wall of the dome bucket through the vanes, and continues to return to the bottom downwards along the outside wall and reenters the dome bucket to act to parts in the dome bucket repeatedly. The airflow diversion circulating method and device ensure that nitriding of a plurality of layers of dense stainless steel sheet parts is uniform, and have the advantages that the gas raw material consumption is low, the single charging amount is large, the nitriding efficiency is high, and the nitriding time is short.

Description

technical field [0001] The invention relates to a gas nitriding furnace gas flow diversion circulation method and device, belonging to the technical field of nitriding furnaces. Background technique [0002] At present, the working process of the nitriding furnace is to place the workpiece in the furnace, directly input NH3 gas into the nitriding furnace, and keep it at the nitriding temperature for 3 to 50 hours, so that the NH3 gas is decomposed into atomic state (N) gas and (H) Nitriding treatment with gas can make the surface of the nitriding workpiece obtain a nitrogen-containing strengthening layer, and obtain high hardness, high wear resistance, high fatigue limit and good wear resistance, but the traditional nitriding furnace is in the parts nitrogen During the nitriding process, especially the uneven nitriding of a large number of dense parts and the underutilization of ammonia gas, such as the soft nitriding of a large amount of gas in the compressor slide, the amm...

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Problems solved by technology

[0002] At present, the working process of the nitriding furnace is to place the workpiece in the furnace, and directly input the NH3 gas into the nitriding furnace, and keep it at the nitriding temperature for 3 to 50 hours, so that the NH3 gas is decomposed into atomic state (N) gas and (H) Nitriding treatment with gas can obtain a nitrogen-containing strengthening layer on the surface of the nitriding workpiece, and obtain high hardness, high wear resistance, high fatigue limit and good wear resistance, but the traditional nitriding furnace is in the process of parts nitrogen During the nitriding process, especially the uneven nitriding of a large number of dense parts and the underutilization of ammonia gas, such as the nitrocarburization of a large amount of gas for compressor slides, the ammonia gas enters the furnace tank for a short period of time, and the dense swing Putting parts interferes with the flow of air flow. Ammonia gas cannot be distributed evenly in the furnace tank, so that the parts are poorly nitrided. Many small parts placed in multi-layer dense nitriding are not uniform, which affects the quality of parts. Therefore, for the furnace For large-scale nitriding of dense parts, the structure of the existing gas nitriding furnace is still not perfect

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