Nitrocarburizing process for producing anti-wear chain

Abstract

The application relates to the chain processing technical field and discloses a nitrocarburizing treatment process for wear-resistant chain production, which comprises the following steps: (1) cleaning and drying the chain to be treated; (2) carrying out nitrocarburizing treatment on the cleaned chain; wherein the temperature in the initial stage is 780-800 DEG C, and the temperature in the strengthening stage is 750-760 DEG C; (3) carrying out quenching treatment after the nitrocarburizing treatment; (4) carrying out tempering treatment on the chain after the quenching treatment, and completing the whole treatment process; the existing treatment process is optimized and improved in a series of ways, the surface hardness of the treated chain is greatly improved, the wear resistance of the chain is obviously improved, and the service life of the chain is prolonged.

Description

Technical Field

[0001] This invention relates to the field of chain treatment technology, specifically a nitrogen-carbon co-infiltration treatment process for the production of wear-resistant chains. Background Technology

[0002] With the continuous improvement of living standards and the deepening of my country's manufacturing industry, the level of my country's manufacturing industry has also been continuously improved and strengthened.

[0003] Chains are generally metal links or rings, and are mostly used for mechanical transmission and traction. They have a wide range of applications, such as chain-like objects used to obstruct traffic (e.g., in streets, at the entrances of rivers or harbors), and for mechanical transmission.

[0004] Chains include four main series: drive chains; conveyor chains; traction chains; and special-purpose chains.

[0005] Because chains have a wide range of applications, they need to have a certain degree of wear resistance in some applications to reduce wear during operation and extend their service life. However, the wear resistance of existing chains is relatively average. Due to insufficient wear resistance, their service life is significantly shortened. After prolonged wear, their mechanical properties will decrease, making them unable to continue working, prone to breakage, and potentially causing accidents.

[0006] Based on this, we propose a nitrogen-carbon co-infiltration process for the production of wear-resistant chains, hoping to address the shortcomings of existing technologies. Summary of the Invention

[0007] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a nitrogen-carbon co-infiltration treatment process for the production of wear-resistant chains.

[0008] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A nitrogen-carbon co-diffusion treatment process for the production of wear-resistant chains includes the following steps: (1) Clean and dry the chain to be treated; (2) The cleaned chain is subjected to nitrocarburizing treatment; The atmosphere for the nitrocarburizing treatment is: propane + methanol + nitrogen + ammonia. In the atmosphere of the nitrogen-carbon co-diffusion treatment, the carbon to nitrogen ratio is 1-3:40-50; Nitrogen-carbon co-infiltration treatment consists of two stages: the initial stage and the enhancement stage. The initial stage temperature is 780-800℃, and the strengthening stage temperature is 750-760℃. (3) After nitriding and carbonizing, the material is then quenched. (4) Temper the quenched chain to complete the entire processing.

[0009] As a further technical solution, the chain material is 1Cr18Ni9Ti.

[0010] As a further technical solution, the cleaning in step (1) is to clean the chain to be treated with acetone and water respectively, with cleaning times of 15 min and 10 min respectively, and cleaning temperatures of 70℃ and 55℃ respectively. After cleaning, it is dried at 100℃ for 12 minutes.

[0011] As a further technical solution, the initial stage heating rate in step (2) is 15℃ / s; The initial processing time is 200-230 minutes, and the enhancement processing time is 50-60 minutes.

[0012] As a further technical solution: the quenching treatment in step (3) is carried out by vacuum oil quenching.

[0013] As a further technical solution: the vacuum oil quenching specifically refers to: Hold at 720-750℃ for 30-35 seconds under a vacuum of 0.02 Pa, then adjust the vacuum to 0.005 Pa and the temperature to 700-710℃, hold for 20-30 seconds, and then quench in oil to room temperature.

[0014] As a further technical solution, the tempering process involves first heating to 260-280°C, holding at that temperature for 1-1.5 hours, and then cooling to room temperature.

[0015] As a further technical solution, the heating rate is 10℃ / min.

[0016] As a further technical solution: the cooling adopts an air-cooled cooling method.

[0017] (III) Beneficial Effects Compared with the prior art, the present invention provides a nitrocarburizing treatment process for the production of wear-resistant chains, which has the following beneficial effects: This invention optimizes and improves existing processing techniques, resulting in a significant increase in the surface hardness of the chain after treatment, thereby significantly enhancing its wear resistance and extending its service life.

[0018] This invention involves treating the chain with a nitrocarburizing process. By optimizing the carbon-nitrogen ratio in the treatment atmosphere, the resulting carburized layer on the chain surface exhibits higher surface hardness and wear resistance. Furthermore, the density of this nitrocarburized layer enhances the chain's corrosion resistance. Compared to conventional carburized or nitrided layers, the depth of the nitrocarburized layer formed by this invention is significantly increased, resulting in improved resistance to scratches and seizing. This positively contributes to extending the chain's lifespan and overall performance.

[0019] This invention optimizes and improves the quenching process, enabling the grains in the chain structure to spontaneously grow. Temperature has a greater impact on the grains. Temperature treatment under different vacuum levels can stabilize the grain size, improve the grain structure, reduce chain deformation, and improve the quality of the treated chain. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example 1

[0021] A nitrogen-carbon co-diffusion treatment process for the production of wear-resistant chains includes the following steps: (1) Clean and dry the chain to be treated; the chain to be treated is cleaned with acetone and water respectively, the cleaning time is 15 min and 10 min respectively, and the cleaning temperature is 70℃ and 55℃ respectively. After cleaning, it is dried at 100℃ for 12 minutes; the chain material is 1Cr18Ni9Ti.

[0022] (2) The cleaned chain is subjected to nitrocarburizing treatment; The atmosphere for the nitrocarburizing treatment is: propane + methanol + nitrogen + ammonia. In the atmosphere of the nitrogen-carbon co-diffusion treatment, the carbon to nitrogen ratio is 1:40; Nitrogen-carbon co-infiltration treatment consists of two stages: the initial stage and the enhancement stage. The initial stage temperature is 780℃, and the enhancement stage temperature is 750℃; the initial stage heating rate is 15℃ / s. The initial processing time is 230 minutes, and the enhancement processing time is 60 minutes.

[0023] (3) After nitriding and carbonizing, the quenching process is carried out by vacuum oil quenching. Vacuum oil quenching specifically refers to: Under a vacuum of 0.02 Pa, hold at 720°C for 35 seconds, then adjust the vacuum to 0.005 Pa, adjust the temperature to 700°C, hold for 20 seconds, and then oil quench to room temperature.

[0024] (4) Temper the quenched chain to complete the entire process; the tempering process is to first heat to 260℃, hold for 1 hour, and then cool to room temperature; the heating rate is 10℃ / min; the cooling method is air cooling. Example 2

[0025] A nitrogen-carbon co-diffusion treatment process for the production of wear-resistant chains includes the following steps: (1) Clean and dry the chain to be treated; the chain to be treated is cleaned with acetone and water respectively, the cleaning time is 15 min and 10 min respectively, and the cleaning temperature is 70℃ and 55℃ respectively. After cleaning, it is dried at 100℃ for 12 minutes; the chain material is 1Cr18Ni9Ti.

[0026] (2) The cleaned chain is subjected to nitrocarburizing treatment; The atmosphere for the nitrocarburizing treatment is: propane + methanol + nitrogen + ammonia. In the atmosphere treated by nitrogen-carbon co-diffusion, the carbon to nitrogen ratio is 1.5:42. Nitrogen-carbon co-infiltration treatment consists of two stages: the initial stage and the enhancement stage. The initial stage temperature is 790℃, and the enhancement stage temperature is 755℃; the initial stage heating rate is 15℃ / s. The initial processing time is 210 minutes, and the enhancement processing time is 50-60 minutes.

[0027] (3) After nitriding and carbonizing, the quenching process is carried out by vacuum oil quenching. Vacuum oil quenching specifically refers to: Under a vacuum of 0.02 Pa, hold at 730°C for 32 seconds, then adjust the vacuum to 0.005 Pa and the temperature to 705°C, hold for 25 seconds, and then quench in oil to room temperature.

[0028] (4) Temper the quenched chain to complete the entire process; the tempering process is to first heat to 268℃, hold for 1 hour, and then cool to room temperature; the heating rate is 10℃ / min; the cooling method is air cooling. Example 3

[0029] A nitrogen-carbon co-diffusion treatment process for the production of wear-resistant chains includes the following steps: (1) Clean and dry the chain to be treated; the chain to be treated is cleaned with acetone and water respectively, the cleaning time is 15 min and 10 min respectively, and the cleaning temperature is 70℃ and 55℃ respectively. After cleaning, it is dried at 100℃ for 12 minutes; the chain material is 1Cr18Ni9Ti.

[0030] (2) The cleaned chain is subjected to nitrocarburizing treatment; The atmosphere for the nitrocarburizing treatment is: propane + methanol + nitrogen + ammonia. In the atmosphere of the nitrogen-carbon co-diffusion treatment, the carbon-to-nitrogen ratio is 2:45; Nitrogen-carbon co-infiltration treatment consists of two stages: the initial stage and the enhancement stage. The initial stage temperature is 790℃, and the enhancement stage temperature is 755℃; the initial stage heating rate is 15℃ / s. The initial processing time is 225 minutes, and the enhancement processing time is 55 minutes.

[0031] (3) After nitriding and carbonizing, the quenching process is carried out by vacuum oil quenching. Vacuum oil quenching specifically refers to: Under a vacuum of 0.02 Pa, hold at 740℃ for 34 s, then adjust the vacuum to 0.005 Pa, adjust the temperature to 706℃, hold for 28 s, and then oil quench to room temperature.

[0032] (4) Temper the quenched chain to complete the entire process; the tempering process is to first heat to 270℃, hold for 1.2 hours, and then cool to room temperature; the heating rate is 10℃ / min; the cooling is done by air cooling. Example 4

[0033] A nitrogen-carbon co-diffusion treatment process for the production of wear-resistant chains includes the following steps: (1) Clean and dry the chain to be treated; the chain to be treated is cleaned with acetone and water respectively, the cleaning time is 15 min and 10 min respectively, and the cleaning temperature is 70℃ and 55℃ respectively. After cleaning, it is dried at 100℃ for 12 minutes; the chain material is 1Cr18Ni9Ti.

[0034] (2) The cleaned chain is subjected to nitrocarburizing treatment; The atmosphere for the nitrocarburizing treatment is: propane + methanol + nitrogen + ammonia. In the atmosphere of the nitrogen-carbon co-diffusion treatment, the carbon to nitrogen ratio is 3:50; Nitrogen-carbon co-infiltration treatment consists of two stages: the initial stage and the enhancement stage. The initial stage temperature is 800℃, and the enhancement stage temperature is 760℃; the initial stage heating rate is 15℃ / s. The initial processing time is 200 minutes, and the enhancement processing time is 50 minutes.

[0035] (3) After nitriding and carbonizing, the quenching process is carried out by vacuum oil quenching. Vacuum oil quenching specifically refers to: Under a vacuum of 0.02 Pa, hold at 750°C for 30 seconds, then adjust the vacuum to 0.005 Pa and the temperature to 710°C, hold for 20 seconds, and then oil quench to room temperature.

[0036] (4) Temper the quenched chain to complete the entire process; the tempering process is to first heat up to 280℃, hold for 1.5 hours, and then cool to room temperature; the heating rate is 10℃ / min; the cooling is done by air cooling.

[0037] test Surface hardness was tested on the samples from the examples: the surface Rockwell hardness was measured using an R(M)-150D1 Rockwell hardness tester. Table 1

[0038] Blank control: Untreated 1Cr18Ni9Ti chain; As can be seen from Table 1, the surface hardness of the chain treated by the present invention is significantly improved, thereby significantly improving the wear resistance of the chain.

[0039] Using Example 1 as the base sample, the effects of different initial stage temperatures on the hardness of the treated chain were compared: Table 2

[0040] As can be seen from Table 2, as the set temperature increases, the surface hardness of the chain first increases and then decreases.

[0041] Using Example 1 as the base sample, the effects of different vacuum oil quenching methods on the surface hardness of the chain were compared: Table 3

[0042] Comparative Example 1: Based on Example 1, the vacuum oil quenching was specifically performed as follows: under a vacuum of 0.02 Pa, the temperature was maintained at 750°C for 30 seconds, and then the temperature was quenched to room temperature. Comparative Example 2: Based on Example 1, vacuum oil quenching is specifically performed as follows: Under a vacuum of 0.005 Pa, adjust the temperature to 710℃, hold for 20 seconds, and then quench in oil to room temperature. As can be seen from Table 3, compared with the vacuum oil quenching methods of Comparative Examples 1 and 2, the vacuum oil quenching method of the present invention can improve the surface hardness of the chain to a certain extent.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the equivalents of the appended claims.

Claims

1. A nitrogen-carbon co-infiltration treatment process for the production of wear-resistant chains, characterized in that, Includes the following steps: (1) Clean and dry the chain to be treated; (2) The cleaned chain is subjected to nitrocarburizing treatment; The atmosphere for the nitrocarburizing treatment is: propane + methanol + nitrogen + ammonia. In the atmosphere of the nitrogen-carbon co-diffusion treatment, the carbon to nitrogen ratio is 1-3:40-50; Nitrogen-carbon co-infiltration treatment consists of two stages: the initial stage and the enhancement stage. The initial stage temperature is 780-800℃, and the strengthening stage temperature is 750-760℃. (3) After nitriding and carbonizing, the material is then quenched. (4) Temper the quenched chain to complete the entire process; the chain material is 1Cr18Ni9Ti; the initial stage heating rate in step (2) is 15℃ / s; The initial processing time is 200-230 min, and the strengthening processing time is 50-60 min; the quenching treatment in step (3) is performed by vacuum oil quenching; the vacuum oil quenching specifically refers to: Under a vacuum of 0.02 Pa, hold at 720-750℃ for 30-35 seconds, then adjust the vacuum to 0.005 Pa, adjust the temperature to 700-710℃, hold for 20-30 seconds, and then oil quench to room temperature. The tempering process involves first heating to 260-280℃, holding for 1-1.5 hours, and then cooling to room temperature.

2. The nitrogen-carbon co-infiltration treatment process for producing wear-resistant chains according to claim 1, characterized in that, The cleaning in step (1) involves cleaning the chain to be treated with acetone and water respectively, with cleaning times of 15 min and 10 min respectively, and cleaning temperatures of 70℃ and 55℃ respectively. After cleaning, it is dried at 100℃ for 12 minutes.

3. The nitrogen-carbon co-infiltration treatment process for producing wear-resistant chains according to claim 1, characterized in that, The heating rate is 10℃ / min.

4. The nitrocarburizing treatment process for producing wear-resistant chains according to claim 1, characterized in that: The cooling method used is air cooling.

Images