Annealing process of high-strength special-shaped chain

Abstract

The application relates to the technical field of chain processing, and discloses an annealing process of high-strength special-shaped chain, which comprises the following steps: S1, degreasing; S2, cleaning and drying; S3, pulse magnetic field assisted annealing treatment; and S4, cooling. The special-shaped chain treated by the annealing process can bear greater load and has high reliability. The special-shaped chain made of 20CrMo can be treated by the annealing process, so that the hardness of the material can be reduced to a certain extent, the plasticity and impact toughness of the special-shaped chain are obviously improved, the special-shaped chain has high strength and toughness, the service life is obviously prolonged, and the application field of the special-shaped chain is widened.

Description

Technical Field

[0001] This invention relates to the field of chain processing technology, specifically to an annealing process for high-strength irregularly shaped chains. Background Technology

[0002] A non-standard chain is a type of chain that differs in structure from ordinary chains. It uses non-standard (or unconventional) chain plates and pins. Non-standard chains can not only bear heavy loads but also withstand various forces such as bending, tension, and compression during transmission. The structural characteristics of non-standard chains mainly include the following aspects: 1. The different shapes of the pins and chain plates create an irregular structure.

[0003] 2. The irregularly shaped chain is made of high-quality alloy material, which has the characteristics of high strength, good wear resistance and long service life.

[0004] 3. Irregularly shaped chains are characterized by high precision, high toughness, and high strength, which makes them widely used in various application fields.

[0005] Irregularly shaped chains are widely used in various transmission applications, such as papermaking machinery, food processing machinery, pharmaceutical machinery, glass machinery, packaging machinery, and printing machinery. They feature smooth transmission, long service life, and high reliability, making them a high-quality transmission chain.

[0006] To improve the mechanical properties of irregularly shaped chains, they need to undergo certain heat treatments. However, conventional heat treatments, especially annealing for irregularly shaped chains, have relatively limited effectiveness in improving their performance. Therefore, further improvements are needed to the existing annealing process to enhance its effectiveness.

[0007] Based on this, we propose an annealing process for high-strength irregularly shaped chains, hoping to address the shortcomings of existing technologies. Summary of the Invention

[0008] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an annealing process for high-strength irregularly shaped chains.

[0009] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: An annealing process for high-strength irregularly shaped chains includes the following steps: S1 Degreasing: First, add the heteromorphic chains to be treated to the degreasing solution, adjust the temperature of the degreasing solution to 80-90℃, keep it warm and stir for 10 minutes, then treat it with ultrasound for 3-4 minutes, and then take it out. S2 Cleaning and Drying: Clean the degreased heteromorphic chains, and then place them in a drying oven for drying. S3 pulse magnetic field assisted annealing: The cleaned and dried irregular chain is sent into the annealing furnace for annealing. The annealing furnace has five temperature zones distributed sequentially, including: the first temperature zone, the second temperature zone, the third temperature zone, the fourth temperature zone, and the fifth temperature zone. Pulsed magnetic fields are respectively installed in the second and fourth temperature zones; The irregularly shaped chain passes sequentially through the second, third, fourth, and fifth temperature zones from the first temperature zone to complete the entire annealing process. S4 Cooling: Place the annealed irregular chain into boiling water for cooling. After the temperature reaches equilibrium, remove it and allow it to cool naturally to room temperature.

[0010] As a further technical solution, the irregular chain material is 20CrMo.

[0011] As a further technical solution, the degreasing liquid in S1 comprises the following components by weight: sodium hydrogen phosphate: 1-2 parts; octylphenol polyoxyethylene ether: 1-1.5 parts; sodium hydroxide: 10-15 parts; sodium carbonate: 2-3 parts; fatty secondary alcohol ethyl ether: 1-2 parts; sodium dodecylbenzene sulfonate: 0.2-0.8 parts; water: 60-65 parts.

[0012] As a further technical solution, the ultrasonic processing frequency of S1 is 50kHz and the power is 600W.

[0013] As a further technical solution: S2 cleaning involves fumigation cleaning with hot water steam for 10 minutes; The drying process involves drying at 80°C for 1 hour.

[0014] As a further technical solution: in S3, the temperature of the first temperature zone is 650℃, the temperature of the second temperature zone is 680℃, the temperature of the third temperature zone is 700℃, the temperature of the fourth temperature zone is 730℃, and the temperature of the fifth temperature zone is 950℃. The heterogeneous chain is kept at a temperature in the first temperature zone for 10-15 minutes; The heterogeneous chain is kept at a temperature in the second temperature zone for 30-35 minutes. The heterogeneous chain is kept at a temperature in the third temperature zone for 10-15 minutes; The heterogeneous chain is kept at a temperature in the fourth temperature zone for 30-35 minutes. The heterogeneous chain is kept at the fifth temperature zone for 8-10 minutes.

[0015] As a further technical solution, the magnetic field strength in the second temperature zone is 10mT; The magnetic field strength in the fourth temperature zone is 18 mT.

[0016] As a further technical solution, all temperature zones from the first to the fifth are protected by inert gas; The inert gas is nitrogen.

[0017] During heat treatment under a 1T pulsed magnetic field, the magnetic field can increase the number of low-energy boundaries in grain-oriented silicon steel and affect its grain size and grain orientation.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, the present invention provides an annealing process for high-strength irregularly shaped chains, which has the following beneficial effects: The irregularly shaped chain treated by the annealing process of this invention can withstand greater loads and has high reliability.

[0020] The irregularly shaped chains made of 20CrMo material, after being treated with the annealing process of this invention, can reduce the hardness of the material to a certain extent, thereby significantly improving the plasticity and impact toughness of the irregularly shaped chains. This results in higher strength and toughness of the irregularly shaped chains, significantly extending their service life and broadening their application fields.

[0021] The annealed irregular-shaped chain of this invention adopts a non-standard design, which can better adapt to various transmission environments and working conditions, meet the needs of multiple fields, and has a long service life and high safety.

[0022] This invention significantly improves upon conventional annealing processes by dividing the entire annealing process into five temperature zones with different temperatures. A magnetic field of a certain intensity is used in the middle of each zone for auxiliary treatment. This can significantly eliminate segregation and banded structures in irregularly shaped chain materials, eliminate or reduce residual stress, stabilize dimensions, reduce the tendency of deformation and cracking, refine grains, improve metallographic structure, improve the properties of irregularly shaped chain structures, or prepare for subsequent heat treatment. Detailed Implementation

[0023] 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.

[0024] Example 1 An annealing process for high-strength irregularly shaped chains includes the following steps: S1 Degreasing: First, add the heteromorphic chains to be treated to the degreasing solution, adjust the temperature of the degreasing solution to 80℃, keep it warm and stir for 10 minutes, then treat it with ultrasound for 3 minutes, and then take it out; the degreasing solution includes the following components by weight: sodium hydrogen phosphate: 1 part; octylphenol polyoxyethylene ether: 1 part; sodium hydroxide: 10 parts; sodium carbonate: 2 parts; fatty secondary alcohol ethyl ether: 1 part; sodium dodecylbenzene sulfonate: 0.2 parts; water: 60 parts.

[0025] The ultrasonic processing frequency is 50kHz and the power is 600W.

[0026] The irregularly shaped chain material used is 20CrMo; S2 Cleaning and Drying: The degreased amorphous chains are cleaned, and then placed in a drying oven for drying; the cleaning process involves steam cleaning with hot water for 10 minutes. The drying process involves drying at 80°C for 1 hour.

[0027] S3 pulse magnetic field assisted annealing: The cleaned and dried irregular chain is sent into the annealing furnace for annealing. The annealing furnace has five temperature zones distributed sequentially, including: the first temperature zone, the second temperature zone, the third temperature zone, the fourth temperature zone, and the fifth temperature zone. Pulsed magnetic fields are respectively installed in the second and fourth temperature zones; The irregularly shaped chain passes sequentially through the second, third, fourth, and fifth temperature zones from the first temperature zone to complete the entire annealing process; the temperature of the first temperature zone is 650℃, the temperature of the second temperature zone is 680℃, the temperature of the third temperature zone is 700℃, the temperature of the fourth temperature zone is 730℃, and the temperature of the fifth temperature zone is 950℃. The heterogeneous chain is kept at the first temperature zone for 10 minutes. The heterogeneous chain was kept at the second temperature zone for 30 minutes. The heterogeneous chain is kept at the third temperature zone for 10 minutes; The heterogeneous chain is kept at the fourth temperature zone for 30 minutes; The heterogeneous chain was kept at the fifth temperature zone for 8 minutes.

[0028] The magnetic field strength in the second temperature region is 10 mT; The magnetic field strength in the fourth temperature zone is 18 mT.

[0029] The first to fifth temperature zones are all protected by nitrogen gas. S4 Cooling: Place the annealed irregular chain into boiling water for cooling. After the temperature reaches equilibrium, remove it and allow it to cool naturally to room temperature.

[0030] Example 2 An annealing process for high-strength irregularly shaped chains includes the following steps: S1 Degreasing: First, add the heteromorphic chains to be treated to the degreasing solution, adjust the temperature of the degreasing solution to 85℃, keep it warm and stir for 10 minutes, then treat it with ultrasound for 3.5 minutes, and then take it out; the degreasing solution contains the following components by weight: sodium hydrogen phosphate: 1.5 parts; octylphenol polyoxyethylene ether: 1.2 parts; sodium hydroxide: 13 parts; sodium carbonate: 2.5 parts; fatty secondary alcohol ethyl ether: 1 part; sodium dodecylbenzene sulfonate: 0.5 parts; water: 62 parts.

[0031] The ultrasonic processing frequency is 50kHz and the power is 600W.

[0032] The irregularly shaped chain material used is 20CrMo; S2 Cleaning and Drying: The degreased amorphous chains are cleaned, and then placed in a drying oven for drying; the cleaning process involves steam cleaning with hot water for 10 minutes. The drying process involves drying at 80°C for 1 hour.

[0033] S3 pulse magnetic field assisted annealing: The cleaned and dried irregular chain is sent into the annealing furnace for annealing. The annealing furnace has five temperature zones distributed sequentially, including: the first temperature zone, the second temperature zone, the third temperature zone, the fourth temperature zone, and the fifth temperature zone. Pulsed magnetic fields are respectively installed in the second and fourth temperature zones; The irregularly shaped chain passes sequentially through the second, third, fourth, and fifth temperature zones from the first temperature zone to complete the entire annealing process; the temperature of the first temperature zone is 650℃, the temperature of the second temperature zone is 680℃, the temperature of the third temperature zone is 700℃, the temperature of the fourth temperature zone is 730℃, and the temperature of the fifth temperature zone is 950℃. The heterogeneous chain was kept at the first temperature zone for 12 minutes. The heterogeneous chain was kept at the second temperature zone for 33 minutes. The heterogeneous chain is kept at the third temperature zone for 12 minutes; The heterogeneous chain was kept at the fourth temperature zone for 33 minutes; The heterogeneous chain was kept at the fifth temperature zone for 9 minutes.

[0034] The magnetic field strength in the second temperature zone is 10 mT; The magnetic field strength in the fourth temperature zone is 18 mT.

[0035] The first to fifth temperature zones are all protected by nitrogen gas. S4 Cooling: Place the annealed irregular chain into boiling water for cooling. After the temperature reaches equilibrium, remove it and allow it to cool naturally to room temperature.

[0036] Example 3 An annealing process for high-strength irregularly shaped chains includes the following steps: S1 Degreasing: First, add the heteromorphic chains to be treated to the degreasing solution, adjust the temperature of the degreasing solution to 90℃, keep it warm and stir for 10 minutes, then treat it with ultrasound for 4 minutes, and then take it out; the degreasing solution includes the following components by weight: sodium hydrogen phosphate: 1 part; octylphenol polyoxyethylene ether: 1.5 parts; sodium hydroxide: 15 parts; sodium carbonate: 2 parts; fatty secondary alcohol ethyl ether: 2 parts; sodium dodecylbenzene sulfonate: 0.6 parts; water: 62 parts.

[0037] The ultrasonic processing frequency is 50kHz and the power is 600W.

[0038] The irregularly shaped chain material used is 20CrMo; S2 Cleaning and Drying: The degreased amorphous chains are cleaned, and then placed in a drying oven for drying; the cleaning process involves steam cleaning with hot water for 10 minutes. The drying process involves drying at 80°C for 1 hour.

[0039] S3 pulse magnetic field assisted annealing: The cleaned and dried irregular chain is sent into the annealing furnace for annealing. The annealing furnace has five temperature zones distributed sequentially, including: the first temperature zone, the second temperature zone, the third temperature zone, the fourth temperature zone, and the fifth temperature zone. Pulsed magnetic fields are respectively installed in the second and fourth temperature zones; The irregularly shaped chain passes sequentially through the second, third, fourth, and fifth temperature zones from the first temperature zone to complete the entire annealing process; the temperature of the first temperature zone is 650℃, the temperature of the second temperature zone is 680℃, the temperature of the third temperature zone is 700℃, the temperature of the fourth temperature zone is 730℃, and the temperature of the fifth temperature zone is 950℃. The heterogeneous chain was kept at the first temperature zone for 14 minutes. The heterogeneous chain was kept at the second temperature zone for 30 minutes. The heterogeneous chain was kept at the third temperature zone for 14 minutes; The heterogeneous chain is kept at the fourth temperature zone for 30 minutes; The heterogeneous chain was kept at the fifth temperature zone for 10 minutes.

[0040] The magnetic field strength in the second temperature zone is 10 mT; The magnetic field strength in the fourth temperature zone is 18 mT.

[0041] The first to fifth temperature zones are all protected by nitrogen gas. S4 Cooling: Place the annealed irregular chain into boiling water for cooling. After the temperature reaches equilibrium, remove it and allow it to cool naturally to room temperature.

[0042] Example 4 An annealing process for high-strength irregularly shaped chains includes the following steps: S1 Degreasing: First, add the heteromorphic chains to be treated to the degreasing solution, adjust the temperature of the degreasing solution to 90℃, keep it warm and stir for 10 minutes, then treat it with ultrasound for 4 minutes, and then take it out; the degreasing solution includes the following components by weight: sodium hydrogen phosphate: 2 parts; octylphenol polyoxyethylene ether: 1.5 parts; sodium hydroxide: 15 parts; sodium carbonate: 3 parts; fatty secondary alcohol ethyl ether: 2 parts; sodium dodecylbenzene sulfonate: 0.8 parts; water: 65 parts.

[0043] The ultrasonic processing frequency is 50kHz and the power is 600W.

[0044] The irregularly shaped chain material used is 20CrMo; S2 Cleaning and Drying: The degreased amorphous chains are cleaned, and then placed in a drying oven for drying; the cleaning process involves steam cleaning with hot water for 10 minutes. The drying process involves drying at 80°C for 1 hour.

[0045] S3 pulse magnetic field assisted annealing: The cleaned and dried irregular chain is sent into the annealing furnace for annealing. The annealing furnace has five temperature zones distributed sequentially, including: the first temperature zone, the second temperature zone, the third temperature zone, the fourth temperature zone, and the fifth temperature zone. Pulsed magnetic fields are respectively installed in the second and fourth temperature zones; The irregularly shaped chain passes sequentially through the second, third, fourth, and fifth temperature zones from the first temperature zone to complete the entire annealing process; the temperature of the first temperature zone is 650℃, the temperature of the second temperature zone is 680℃, the temperature of the third temperature zone is 700℃, the temperature of the fourth temperature zone is 730℃, and the temperature of the fifth temperature zone is 950℃. The heterogeneous chain was kept at the first temperature zone for 15 minutes. The heterogeneous chain was kept at the second temperature zone for 35 minutes. The heterogeneous chain is kept at the third temperature zone for 15 minutes; The heterogeneous chain was kept at the fourth temperature zone for 35 minutes; The heterogeneous chain was kept at the fifth temperature zone for 10 minutes.

[0046] The magnetic field strength in the second temperature region is 10 mT; The magnetic field strength in the fourth temperature zone is 18 mT.

[0047] The first to fifth temperature zones are all protected by nitrogen gas. S4 Cooling: Place the annealed irregular chain into boiling water for cooling. After the temperature reaches equilibrium, remove it and allow it to cool naturally to room temperature.

[0048] Comparative Example 1: An annealing process for high-strength irregularly shaped chains includes the following steps: S1 Degreasing: First, add the heteromorphic chains to be treated to the degreasing solution, adjust the temperature of the degreasing solution to 80℃, keep it warm and stir for 10 minutes, then treat it with ultrasound for 3 minutes, and then take it out; the degreasing solution includes the following components by weight: sodium hydrogen phosphate: 1 part; octylphenol polyoxyethylene ether: 1 part; sodium hydroxide: 10 parts; sodium carbonate: 2 parts; fatty secondary alcohol ethyl ether: 1 part; sodium dodecylbenzene sulfonate: 0.2 parts; water: 60 parts.

[0049] The ultrasonic processing frequency is 50kHz and the power is 600W.

[0050] The irregularly shaped chain material used is 20CrMo; S2 Cleaning and Drying: The degreased amorphous chains are cleaned, and then placed in a drying oven for drying; the cleaning process involves steam cleaning with hot water for 10 minutes. The drying process involves drying at 80°C for 1 hour.

[0051] S3 Annealing: The cleaned and dried irregular chain is sent into the annealing furnace for annealing. The annealing furnace has five temperature zones distributed sequentially, including: the first temperature zone, the second temperature zone, the third temperature zone, the fourth temperature zone, and the fifth temperature zone. The irregularly shaped chain passes sequentially through the second, third, fourth, and fifth temperature zones from the first temperature zone to complete the entire annealing process; the temperature of the first temperature zone is 650℃, the temperature of the second temperature zone is 680℃, the temperature of the third temperature zone is 700℃, the temperature of the fourth temperature zone is 730℃, and the temperature of the fifth temperature zone is 950℃. The heterogeneous chain was kept at the first temperature zone for 10 minutes. The heterogeneous chain was kept at the second temperature zone for 30 minutes. The heterogeneous chain is kept at the third temperature zone for 10 minutes; The heterogeneous chain is kept at the fourth temperature zone for 30 minutes; The heterogeneous chain was kept at the fifth temperature zone for 8 minutes.

[0052] The first to fifth temperature zones are all protected by nitrogen gas. S4 Cooling: Place the annealed irregular chain into boiling water for cooling. After the temperature reaches equilibrium, remove it and allow it to cool naturally to room temperature.

[0053] test Steel plates (5 mm × 5 mm × 30 mm) made of the same 20CrMo steel were randomly divided into 5 groups of 5 plates each. Examples and comparative examples were then processed and subjected to room temperature tensile tests at a tensile speed of 3 mm / min. Table 1

[0054] As can be seen from Table 1, the annealing process of the present invention can significantly improve the tensile strength of 20CrMo steel, thereby enabling the irregularly shaped chains made from it to have higher strength.

[0055] According to the latest national standard GB / T229-2020, 20CrMo steel was used to prepare V-notch impact specimens with dimensions of 5mm × 5mm × 30mm. Each specimen had a 45° V-notch with a depth of 2mm in the center. The specimens were randomly divided into 6 groups of 10 specimens each. Five groups underwent annealing treatment using the processes described in the examples and comparative examples. Impact tests were then conducted on an impact testing machine at both room temperature and low temperature. The pendulum energy of the testing machine was 250J, and the impact temperatures were 20℃ (room temperature) and -20℃ (low temperature). Table 2. Room Temperature

[0056] As can be seen from Table 2, the annealing process of the present invention can significantly improve the room temperature impact performance of 20CrMo steel. It is evident that the treatment of irregularly shaped chains by the process of the present invention can significantly improve its room temperature impact performance. Table 3 Low Temperature

[0057] As can be seen from Table 3, the annealing process of the present invention can significantly improve the low-temperature impact performance of 20CrMo steel. It is evident that the treatment of irregularly shaped chains by the process of the present invention can significantly improve its low-temperature impact performance.

[0058] 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. An annealing process for high-strength irregularly shaped chains, characterized in that, Includes the following steps: S1 Degreasing: First, add the heteromorphic chains to be treated to the degreasing solution, adjust the temperature of the degreasing solution to 80-90℃, keep it warm and stir for 10 minutes, then treat it with ultrasound for 3-4 minutes, and then take it out. S2 Cleaning and Drying: Clean the degreased heteromorphic chains, and then place them in a drying oven for drying. S3 pulse magnetic field assisted annealing: The cleaned and dried irregular chain is sent into the annealing furnace for annealing. The annealing furnace has five temperature zones distributed sequentially, including: a first temperature zone, a second temperature zone, a third temperature zone, a fourth temperature zone, and a fifth temperature zone; the temperature of the first temperature zone is 650℃, the temperature of the second temperature zone is 680℃, the temperature of the third temperature zone is 700℃, the temperature of the fourth temperature zone is 730℃, and the temperature of the fifth temperature zone is 950℃. Pulsed magnetic fields are respectively installed in the second and fourth temperature zones; The magnetic field strength in the second temperature zone is 10 mT; the magnetic field strength in the fourth temperature zone is 18 mT. The irregularly shaped chain passes sequentially through the second, third, fourth, and fifth temperature zones from the first temperature zone to complete the entire annealing process. S4 Cooling: Place the annealed irregular chain into boiling water for cooling. After the temperature reaches equilibrium, remove it and allow it to cool naturally to room temperature.

2. The annealing process for a high-strength irregularly shaped chain according to claim 1, characterized in that, The irregular chain material used is 20CrMo.

3. The annealing process for a high-strength irregularly shaped chain according to claim 2, characterized in that, The degreasing solution described in S1 comprises the following components by weight: sodium hydrogen phosphate: 1-2 parts; Octylphenol polyoxyethylene ether 1-1.5 parts; sodium hydroxide 10-15 parts; Sodium carbonate 2-3 parts; fatty secondary alcohol ether 1-2 parts; sodium dodecylbenzene sulfonate 0.2-0.8 parts; water 60-65 parts.

4. The annealing process for a high-strength irregularly shaped chain according to claim 1, characterized in that, The ultrasonic processing frequency described in S1 is 50kHz, and the power is 600W.

5. The annealing process for a high-strength irregularly shaped chain according to claim 1, characterized in that: In S2, the cleaning process involves fumigating with hot water steam for 10 minutes. The drying process involves drying at 80°C for 1 hour.

6. The annealing process for a high-strength irregularly shaped chain according to claim 5, characterized in that: The irregular chain described in S3 is kept at a temperature of 10-15 min in the first temperature zone; the irregular chain is kept at a temperature of 30-35 min in the second temperature zone; the irregular chain is kept at a temperature of 10-15 min in the third temperature zone; the irregular chain is kept at a temperature of 30-35 min in the fourth temperature zone; and the irregular chain is kept at a temperature of 8-10 min in the fifth temperature zone.

7. The annealing process for a high-strength irregularly shaped chain according to claim 6, characterized in that, The first to fifth temperature zones are all protected by an inert gas, namely nitrogen.

Images