A cryogenic treatment apparatus for a bimetallic band saw and a method of using the same

Abstract

The application discloses a kind of bimetallic band saw cryogenic treatment equipment and its using method, comprising the following steps: step one, assembly;Step two, fixed;Step three, nitrogen filling;Step four, cryogenic;Wherein in the above step one, first bimetallic band saw cryogenic treatment equipment is assembled according to design requirement;Wherein in the above step two, rotating base is fixed and placed on motor-controlled rotatable platform, and rotates under motor control through rotatable platform, while driving bimetallic band saw cryogenic treatment rotation;Wherein in the above step three, nitrogen gas is filled in the inside of liquid nitrogen tank by using the liquid nitrogen valve;The application, overcome the deficiency existing in the current production process, solve the current assembly line production band saw in the process, cryogenic treatment difficult problem, so that band saw can be cryogenic treated to a certain extent in continuous heat treatment production process, so that material performance is improved.

Description

Technical Field

[0001] This invention relates to the field of band saw manufacturing technology, specifically to a cryogenic treatment device for a bimetallic band saw and its usage method. Background Technology

[0002] Saw bands are widely used in various industries such as machinery manufacturing and materials processing. Saw bands are generally made of high-carbon tool steel, and their hardness and toughness are improved through overall quenching and tempering. From a material economy perspective, high-carbon tool steel is expensive, and since the saw band's cutting action is primarily performed by the teeth, while the backing mainly bears the load, using only high-carbon tool steel results in insufficient toughness in the backing, leading to reduced performance. Bimetallic saw bands use high-speed tool steel for the teeth and high-strength alloy steel for the backing. These two materials are laser-fused and then heat-treated, giving the backing higher toughness and the teeth higher hardness, resulting in better performance. Most current saw bands utilize a bimetallic composite manufacturing process. For example, the saw tooth material is selected from M42 high-speed steel, and the saw back material is selected from Rm80 steel. The M42 high-speed steel includes the following components by weight percentage: C: 1.10%, W: 1.65%, Mo: 9.5%, Cr: 4.05%, V: 1.20%, S: 0.0015%, P: 0.010%, Co: 8.20%, Si: 0.36%, Mn: 0.60%, with the remainder being iron. The Rm80 steel includes the following components by weight percentage: C: 0.35%, Cr: 3.05%, Mo: 1.98%, Ni: 0.54%, V: 0.36%, S: 0.0015%, P: 0.010%, Mn: 0.68%, Si: 0.46%, with the remainder being iron.

[0003] During use, band saws require high tooth hardness. Due to their high carbon content, the teeth undergo quenching and multiple tempering processes to form the final product. However, due to the material's properties, a large amount of retained austenite remains during quenching, preventing the tooth hardness from meeting usage requirements. This leads to uneven stress and distortion during production and use, reducing the material's performance. Deep cryogenic treatment during band saw production can reduce the amount of retained austenite. Deep cryogenic treatment typically uses liquid nitrogen to cool the workpiece. Liquid nitrogen has a liquefaction point of -196℃ at atmospheric pressure. Holding the material below -130℃ for a certain period constitutes deep cryogenic treatment. This decomposes the retained austenite, reducing its content and improving the material's hardness and wear resistance, ultimately increasing its service life. Therefore, deep cryogenic treatment contributes to improving the quality of band saws.

[0004] Currently, band saw production mostly employs a continuous heat treatment mode. Under traction, the saw blade, teeth facing upwards, passes vertically through a quenching furnace → quenching → tempering 1 → cooling → tempering 2 → cooling → tempering 3 → cooling, completing the heat treatment process in a continuous flow. Under this process, if low-temperature nitrogen is used as the cooling gas, the cooling temperature is insufficient to achieve the desired cryogenic effect. Using liquid nitrogen as the cryogenic treatment medium presents significant challenges, as the movement of the saw blade makes entering the liquid nitrogen difficult. Unless a segmented heat treatment process is adopted, it increases labor intensity and reduces efficiency. Furthermore, while horizontal movement of the band saw facilitates cryogenic treatment, the saw teeth can damage the heating furnace and conveyor tracks, affecting the lifespan of the production equipment. Additionally, the generally long cryogenic treatment time complicates the adjustment of continuous heat treatment process times. These inherent problems with the cryogenic treatment process hinder its widespread adoption and application in assembly line production. Summary of the Invention

[0005] The purpose of this invention is to provide a cryogenic treatment device for a bimetallic band saw and a method for using it, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cryogenic treatment device for a bimetallic band saw and its method of use, comprising the following steps: Step 1, assembly; Step 2, fixing; Step 3, nitrogen purging; Step 4, cryogenic treatment;

[0007] In step one above, the cryogenic treatment equipment for the bimetal band saw is first assembled according to the design requirements.

[0008] In step two above, the rotating base is fixedly placed on a motor-controlled rotatable platform. The rotatable platform rotates under the control of the motor, which in turn drives the bimetal band saw to rotate during cryogenic treatment.

[0009] In step three above, the liquid nitrogen tank is filled with nitrogen gas using a liquid nitrogen valve, and the amount of nitrogen gas inside the liquid nitrogen tank is monitored using a liquid nitrogen level sensor.

[0010] In step four above, the cryogenic treatment equipment for bimetal band saws can be used independently or multiple cryogenic treatment equipment for bimetal band saws can be used in combination. The number of cryogenic treatment equipment for bimetal band saws can be appropriately increased. During the cryogenic process, the band saw is placed in the band saw moving groove opened on the liquid nitrogen tank and the band saw is in close contact with the liquid nitrogen tank.

[0011] Preferably, in step one, the cryogenic treatment equipment for the bimetallic band saw includes a liquid nitrogen tank, a band saw moving groove, a rotating base, a liquid nitrogen tank insulation layer, a tank cover fixing support, a liquid nitrogen valve, a nitrogen overflow valve, a tank cover, and a liquid nitrogen level sensor. The liquid nitrogen tank is fixedly connected to the rotating base. The band saw moving groove is provided at the bottom of the liquid nitrogen tank. The liquid nitrogen tank is wrapped with a liquid nitrogen tank insulation layer. The top of the liquid nitrogen tank is rotatably connected to a tank cover. A sealing gasket is provided at the connection between the liquid nitrogen tank and the tank cover. The tank cover is provided with a tank cover fixing support, a liquid nitrogen valve, a nitrogen overflow valve, a tank cover, and a liquid nitrogen level sensor.

[0012] Preferably, in step two, the rotation direction of the rotatable platform is consistent with the movement direction of the band saw, and the movement speed of the liquid nitrogen tank wall is consistent with the movement speed of the band saw, so as to prevent the band saw and the liquid nitrogen tank from wearing each other due to inconsistent speeds.

[0013] Preferably, in step three, the lid fixing support is fixed to another object, thereby using the set lid fixing support to fix the liquid nitrogen tank, so as to maintain the fixation of the lid when the liquid nitrogen tank rotates.

[0014] Preferably, in step four, during the movement of the band saw, the rotational platform drives the rotation of the cryogenic treatment equipment, thereby performing real-time cryogenic treatment on the band saw. If the cryogenic treatment equipment is used in combination, the band saws need to be wrapped around each other on the liquid nitrogen tank wall to increase the cryogenic time. Since the band saws are not seamlessly connected between different cryogenic treatment equipment, multiple cryogenic treatments can be achieved. Multiple cryogenic treatments can effectively reduce the required cryogenic process time and achieve better results, thus enabling continuous cryogenic treatment of the band saw under continuous heat treatment process conditions.

[0015] Preferably, in step four, during the cryogenic treatment process, cryogenic treatment equipment is added to ensure that the band saw obtains a cryogenic treatment time of 30-60 minutes after quenching and a cryogenic treatment time of 15-30 minutes after each tempering.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1) This cryogenic equipment device enables the band saw to achieve cryogenic treatment during continuous heat treatment by using a rotating liquid nitrogen tank wall cooling method;

[0018] 2) During the cooling process of the sample by this cryogenic device, the liquid nitrogen does not come into direct contact with the band saw, and the large number of bubbles generated by the nitrogen will not cause uneven cooling effect.

[0019] 3) This cryogenic device can save on nitrogen consumption;

[0020] 4) This cryogenic treatment process can reduce the amount of residual austenite during the quenching and tempering of the teeth;

[0021] 5) Through this cryogenic treatment process, when multiple cryogenic devices are used in combination, it is equivalent to multiple cycles of cryogenic treatment, which can promote the dispersion and precipitation of carbides in the residual austenite, thereby promoting the uniformity and wear resistance of the material properties.

[0022] 6) This cryogenic treatment process can improve the hardness and service life of the product compared to the original process. Attached Figure Description

[0023] Figure 1 This is a front view of the cryogenic processing equipment of the present invention;

[0024] Figure 2 This is a front sectional view of the cryogenic processing equipment of the present invention;

[0025] Figure 3 This is a flowchart of the method of the present invention;

[0026] In the diagram: 1. Liquid nitrogen tank; 2. Band saw moving trough; 3. Rotating base; 4. Liquid nitrogen tank insulation layer; 5. Tank cover fixing support; 6. Liquid nitrogen valve; 7. Nitrogen overflow valve; 8. Tank cover; 9. Liquid nitrogen level sensor. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1-3 The present invention provides an embodiment of a cryogenic treatment device for a bimetallic band saw and its method of use, comprising the following steps: Step 1, assembly; Step 2, fixing; Step 3, nitrogen purging; Step 4, cryogenic treatment;

[0029] In step one above, the cryogenic treatment equipment for the bimetal band saw is first assembled according to the design requirements. The cryogenic treatment equipment for the bimetal band saw includes a liquid nitrogen tank 1, a band saw moving groove 2, a rotating base 3, a liquid nitrogen tank insulation layer 4, a tank cover fixing support 5, a liquid nitrogen valve 6, a nitrogen overflow valve 7, a tank cover 8, and a liquid nitrogen level sensor 9. The liquid nitrogen tank 1 is fixedly connected to the rotating base 3. The band saw moving groove 2 is opened at the bottom of the liquid nitrogen tank 1. The liquid nitrogen tank 1 is wrapped with a liquid nitrogen tank insulation layer 4. The top of the liquid nitrogen tank 1 is rotatably connected to the tank cover 8. A sealing gasket is provided at the connection between the liquid nitrogen tank 1 and the tank cover 8. The tank cover 8 is equipped with a tank cover fixing support 5, a liquid nitrogen valve 6, a nitrogen overflow valve 7, a tank cover 8, and a liquid nitrogen level sensor 9.

[0030] In step two above, the rotating base 3 is fixedly placed on a motor-controlled rotatable platform. The rotatable platform rotates under the control of the motor, which in turn drives the bimetallic band saw to rotate for cryogenic treatment. The rotation direction of the rotatable platform is consistent with the movement direction of the band saw, and the movement speed of the liquid nitrogen tank 1 is consistent with the movement speed of the band saw, so as to prevent the band saw and the liquid nitrogen tank from being worn against each other due to inconsistent speeds.

[0031] In step three above, the liquid nitrogen valve 6 is used to fill the interior of the liquid nitrogen tank 1 with nitrogen gas. At the same time, the liquid nitrogen level sensor 9 is used to monitor the amount of nitrogen gas inside the liquid nitrogen tank 1. The lid fixing support 5 is fixed to other objects, thereby fixing the liquid nitrogen tank 1 with the lid fixing support 5, so as to maintain the fixation of the lid 8 when the liquid nitrogen tank 1 is rotated.

[0032] In step four above, the cryogenic treatment equipment for bimetal band saws can be used independently or in combination. The number of cryogenic treatment devices can be appropriately increased. During the cryogenic process, the band saw is placed in the band saw moving groove 2 opened on the liquid nitrogen tank 1, and the band saw is brought into contact with the liquid nitrogen tank 1. As the band saw moves, a rotating platform drives the rotation of the cryogenic treatment equipment, thereby performing real-time cryogenic treatment on the band saw. If the cryogenic treatment equipment is used in combination, the band saws need to be interlocked on the liquid nitrogen tank wall. This increases the cryogenic treatment time. Since the band saw is not seamlessly connected between different cryogenic treatment devices, multiple cryogenic treatments can be achieved. Multiple cryogenic treatments can effectively reduce the required cryogenic process time and achieve better results. Thus, continuous cryogenic treatment of the band saw can be achieved under continuous heat treatment process conditions. Furthermore, by adding cryogenic treatment equipment during the cryogenic treatment process, it is ensured that the band saw obtains 30-60 minutes of cryogenic treatment time after quenching and 15-30 minutes of cryogenic treatment time after each tempering.

[0033] Based on the above, the advantage of this invention is that, when used, it solves the problem of the difficulty of cryogenic treatment in the current production process of band saws on assembly lines, enabling band saws to undergo a certain degree of cryogenic treatment during continuous heat treatment production, thereby improving material properties.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A method of using a cryogenic treatment device for a bimetallic band saw, comprising the following steps: Step 1, assembly; Step 2, fixing; Step 3, nitrogen purging; Step 4, cryogenic treatment; characterized in that: In step one above, the cryogenic treatment equipment for the bimetal band saw is first assembled according to design requirements; In step two above, the rotating base (3) is fixedly placed on a motor-controlled rotatable platform. The rotatable platform rotates under the control of the motor, which in turn drives the bimetal band saw to rotate during cryogenic treatment. In step three above, nitrogen gas is filled into the liquid nitrogen tank (1) using the liquid nitrogen valve (6), and the amount of nitrogen gas inside the liquid nitrogen tank (1) is monitored using the liquid nitrogen level sensor (9). In step four above, the cryogenic treatment equipment for bimetal band saws can be used independently or in combination with multiple cryogenic treatment equipment for bimetal band saws. The number of cryogenic treatment equipment for bimetal band saws can be increased appropriately. During the cryogenic process, the band saw is placed in the band saw moving groove (2) opened on the liquid nitrogen tank (1) and the band saw is attached to the liquid nitrogen tank (1). In step one, the cryogenic treatment equipment for the bimetallic band saw includes a liquid nitrogen tank (1), a band saw moving groove (2), a rotating base (3), a liquid nitrogen tank insulation layer (4), a tank cover fixing support (5), a liquid nitrogen valve (6), a nitrogen overflow valve (7), a tank cover (8), and a liquid nitrogen level sensor (9). The liquid nitrogen tank (1) is fixedly connected to the rotating base (3). At the same time, the bottom of the liquid nitrogen tank (1) is provided with a band saw moving groove (2). The liquid nitrogen tank (1) is wrapped with a liquid nitrogen tank insulation layer (4). The top of the liquid nitrogen tank (1) is rotatably connected to a tank cover (8). A sealing gasket is provided at the connection between the liquid nitrogen tank (1) and the tank cover (8). The tank cover (8) is provided with a tank cover fixing support (5), a liquid nitrogen valve (6), a nitrogen overflow valve (7), a tank cover (8), and a liquid nitrogen level sensor (9). In step two, the rotation direction of the rotatable platform is consistent with the movement direction of the band saw, and the movement speed of the liquid nitrogen tank (1) wall is consistent with the movement speed of the band saw, so as to prevent the band saw and the liquid nitrogen tank from being worn together due to inconsistent speeds.

2. The method of using the cryogenic processing equipment for a bimetallic band saw according to claim 1, characterized in that... In step three, the lid fixing support (5) is fixed to other objects, thereby fixing the liquid nitrogen tank (1) by using the set lid fixing support (5), so as to maintain the fixation of the lid (8) when the liquid nitrogen tank (1) is rotated.

3. The method of using the cryogenic processing equipment for a bimetallic band saw according to claim 1, characterized in that... In step four, as the band saw moves, the rotating platform drives the cryogenic treatment equipment to rotate, thereby performing real-time cryogenic treatment on the band saw. If cryogenic treatment equipment is used in combination, the band saws need to be wrapped around each other on the liquid nitrogen tank wall to increase the cryogenic time. Since the band saws are not seamlessly connected between different cryogenic treatment equipment, multiple cryogenic treatments are achieved. Multiple cryogenic treatments can effectively reduce the required cryogenic process time and achieve better results, thus realizing continuous cryogenic treatment of the band saw under continuous heat treatment process conditions.

4. The method of using the cryogenic processing equipment for a bimetallic band saw according to claim 1, characterized in that... In step four, during the cryogenic treatment process, cryogenic treatment equipment is added to ensure that the band saw obtains a cryogenic treatment time of 30-60 minutes after quenching and a cryogenic treatment time of 15-30 minutes after each tempering.

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