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

A detection method and gas nitriding technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of inability to sample, long nitriding time, and high cost, so as to reduce nitriding time and improve Qualification rate, cost saving effect

Active Publication Date: 2011-01-12
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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specific Embodiment approach 1

[0017] Specific implementation mode one: combine figure 1 Describe this embodiment, the specific steps of the non-stop gas nitriding sampling detection method of this embodiment are as follows:

[0018] Step 1: Perform anti-nitridation treatment on the non-nitrided surface of the workpiece;

[0019] Step 2: Open the nitriding furnace, put the workpiece and the final inspection sample accompanying the workpiece into the nitriding tank 10;

[0020] Step 3: each nitriding sample 3 is suspended in the nitriding tank 10 by a sampling wire 5;

[0021] Step 4: Cover the sealing cover 4 of the sampling hole, start the nitriding furnace, feed ammonia gas, and heat the nitriding tank 10 to 450°C-650°C;

[0022] Step 5: Carry out nitriding heat preservation according to the process parameters;

[0023] Step 6: When the holding time is close to the process specification, open the sealing cover 4 of the sampling hole, pull a sampling wire 5 to take out the corresponding nitrided sample ...

specific Embodiment approach 2

[0025] Specific implementation mode two: combination figure 1 To illustrate this embodiment, in step 3, the nitriding sample 3 is hung in the nitriding tank 10 near the workpiece. In this embodiment, the nitriding sample and the workpiece are nitrided synchronously, and the detection result is the most ideal. Other methods are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Specific implementation mode three: combination figure 1 Describe this embodiment, the nitriding furnace used in this embodiment in order to realize the gas nitriding non-stop sampling detection method described in the first specific embodiment, the nitriding furnace includes a nitriding tank 10 and a nitriding tank upper cover 6, nitrogen The nitriding tank upper cover 6 is sealed and installed on the nitriding tank 10, and the nitriding furnace also includes a sampling hole 1, a sand-sealed outer ring 2, a sealing cover for the sampling hole 4, a plurality of nitriding samples 3, and a connection with the nitriding sample 3. The same number of sampling wires 5, a sampling port 7 is opened on the upper end surface of the upper cover 6 of the nitriding tank, the sampling hole 1 is sealed and inserted in the sampling port 7, and the upper end surface of the sampling hole 1 is higher than the upper cover 6 of the nitriding tank The lower end of the sampling hole 1 is plac...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/24
Inventor 高枝森王淑新贾锦虹杨丹娜林延伟李应新周策段文杰王大生
Owner HARBIN TURBINE
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