Method for gas nitriding sampling detection without shutting down furnace and nitriding furnace used thereby

Abstract

The invention discloses a method for gas nitriding sampling detection without shutting down a furnace and a nitriding furnace used thereby, which relate to a gas nitriding sampling detection method and a nitriding furnace used thereby. The method and the nitriding furnace used thereby solve the problems of long nitridation time and high cost for guaranteeing qualified nitridation in a gas nitriding process in the prior art and the problem that a sample cannot be taken from the conventional nitriding furnace under the condition that the furnace is not shut down. The sampling detection method of the invention comprises the following steps of: putting a workpiece, a final detection test sample and a nitriding test sample into a nitriding tank; starting the nitriding furnace, heating and keeping the temperature; taking the nitriding test sample first when the furnace is almost shut down, testing whether the nitriding test sample is qualified, and shutting down the furnace if the nitriding test sample is qualified, or continuously keeping the temperature for initriding if the nitriding test sample is not qualified. A sampling hole of the nitriding furnace of the invention is sealed in and formed in a sampling opening, a sand sealing outer ring is arranged on an upper cover of the nitriding tank, chrome ore is filled in a circular sand sealing slot formed between the inner wall of the sand sealing outer ring and the outer wall of the sampling hole, and a sampling draw wire passes through the chrome ore to suspend the nitriding test sample in the nitriding tank. The method and the nitriding furanace used thereby are applicable in the gas nitriding sampling detection without shutting down the furnace.

Description

technical field [0001] The invention relates to a gas nitriding sampling detection method and a nitriding furnace used therein. Background technique [0002] Gas nitriding of metal parts (referred to as nitriding) is a process of infiltrating nitrogen into the surface of the workpiece. Its purpose is to improve the hardness, wear resistance, corrosion resistance and fatigue resistance of the workpiece surface. Nitriding is carried out in a closed nitriding tank. The nitriding tank, heating equipment and heat preservation equipment are collectively referred to as a nitriding furnace. The gas can be decomposed into nitrogen and hydrogen after being heated), start the nitriding furnace, and the quality inspection of nitriding is to extract the nitriding sample that is put into the furnace together with the nitriding workpiece, and detect the nitriding hardness of the nitriding sample and the depth of the infiltrated layer. Items with brittleness etc. Because ammonia gas is p...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that in the existing gas nitriding process, the nitriding time of the nitriding furnace is long, the cost is high, and the existing nitriding furnace cannot be sampled without stopping the furnace. , and then provide a gas nitriding non-stop sampling detection method and the nitriding furnace used

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