Process for reducing roller end jump

Abstract

The invention discloses a process for reducing roller end jump, which comprises the following steps of: 1, putting a turned roller to be subjected to heat treatment into a furnace at the temperature of between 450 and 500 DEG C, keeping the temperature for 40 to 60 minutes, discharging the roller out of the furnace, and performing air cooling; 2, after the air-cooled roller to be subjected to heat treatment is subjected to heat treatment, stress testing is conducted; thirdly, the surface stress of the tapered roller subjected to heat treatment through the process is changed into pressure stress from original tensile stress; the details of roller end jumping are improved, and some roller end jumping is even not changed. The device has the advantages that the roller is subjected to high-temperature heat treatment through the heating mechanism, so that the roller is firstly subjected to low-temperature heat treatment, and the occurrence of end jumping during high-temperature heat treatment of the roller can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment devices, in particular to a process for reducing roller end jump. Background Art

[0002] Bearing rollers are the components that bear the load when the bearing is running, and have an important impact on the working performance and service life of the bearing. They are the weakest parts in the roller bearing, and the manufacturing quality directly affects the performance of the bearing such as rotation accuracy, vibration, noise and flexibility. There are many types of bearing rollers, including tapered rollers, cylindrical rollers, spherical rollers, spiral rollers and various needle rollers. These rollers have different shapes and sizes to suit different types of bearing requirements. The manufacturing process of bearing rollers includes multiple steps, such as blank forming, deburring, heat treatment, grinding and super finishing.

[0003] However, when the roller is cold formed, the combined forces of the material and the vehicle model result in greater stress on the roller surface before heat treatment, causing both the tapered roller and the cylindrical roller to expand, deform, and change in end runout after heat treatment. In particular, the tapered roller has a particularly serious problem of end runout change, and sometimes the end runout even exceeds the requirements of subsequent processing, resulting in scrapping. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a process for reducing roller end jump, which solves the problems raised by the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a process for reducing roller end jump, comprising an outer cylinder, a plurality of supporting legs are fixed to the bottom of the outer cylinder, a feeding funnel is fixed to the top of the outer cylinder, two heating mechanisms are arranged inside the outer cylinder, the heating mechanism comprises a cylinder, an electric heating plate is fixed to the bottom of the cylinder, a plurality of fixing blocks are fixed to the outer wall of the cylinder, the other end of the fixing block is fixedly connected to the inner wall of the outer cylinder, a circular plate is arranged above the cylinder, a circular ring is arranged on the outer side of the circular plate, two connecting blocks are fixed between the top of the circular ring and the circular plate, and the inner part of the connecting block slides A connecting rod is connected, a sealing ring is fixed to the bottom end of the connecting rod, a block is fixed to the top of the connecting rod, the top of the circular plate is rotatably connected to a moving cylinder, a motor is fixed inside the moving cylinder, the output shaft of the motor is fixedly connected to the top of the circular plate, two connecting plates are fixed to the outer side wall of the moving cylinder below, two and one hydraulic rods are fixed to the inner side wall of the outer cylinder and the top of the outer cylinder respectively, the output shaft of the upper hydraulic rod passes through the outer cylinder and is fixedly connected to the top of the moving cylinder above, the output shafts of the two lower hydraulic rods are fixedly connected to the top of the connecting plate, and a discharge pipe is fixed to the bottom of the outer cylinder.

[0006] Preferably, a material unloading mechanism is provided inside the cylinder, and the material unloading mechanism includes a plurality of baffles. The outer wall of the cylinder is provided with a plurality of openings, and the baffles are located inside the openings. Two limiting grooves are provided inside the openings, and a limiting block is provided inside the limiting grooves. The limiting block and the baffle are fixedly connected.

[0007] Preferably, a plurality of iron bars are fixed inside the baffle, and a magnetic ring is fixed to the outer side wall of the circular ring.

[0008] Preferably, a material guiding funnel is fixed inside the outer cylinder.

[0009] Preferably, a plurality of leaks are provided at the bottom of the feed funnel and the bottom of the guide funnel.

[0010] Preferably, the sealing ring, the bottom end of the feed funnel and the bottom end of the guide funnel are all located inside the cylinder. Beneficial Effects

[0011] The present invention provides a process for reducing roller end jump. Compared with the prior art, it has the following beneficial effects: 1. The heat treatment device for reducing roller end jump is provided with a heating mechanism, the roller is poured into the feeding funnel, and then the roller leaks from the leaking port into the interior of the upper cylinder, then the upper hydraulic rod is started, the upper hydraulic rod pushes the upper moving cylinder to move, the upper moving cylinder moves downward with the circular plate, the connecting block and the circular ring, the circular plate, the sealing ring and the circular ring seal the upper part of the cylinder, and at the same time the circular plate, the sealing ring and the circular ring contact with the roller, the electric heating plate is started, the electric heating plate heats the roller, the motor is started, the circular plate, the sealing ring and the circular ring rotate with the roller, so that the roller is heated evenly, the upper heating mechanism heats the roller at 450-500° C. for 40-60 minutes and then air cools, after air cooling, the roller enters the lower heating mechanism, the lower heating mechanism performs high-temperature heat treatment on the roller, so that the roller is first heat treated at a lower temperature to strengthen the strength of the roller, and after air cooling, the high-temperature heat treatment is performed again, so that the roller can reduce the occurrence of end jump when the high-temperature heat treatment is performed.

[0012] 2. The heat treatment device for reducing the end jump of the roller is provided with a feeding mechanism. After the roller is heat treated, the hydraulic rod retracts, and the hydraulic rod moves the circular plate, the connecting block and the circular ring upward. The circular ring moves the magnetic ring upward. The magnetic ring attracts the iron bar and moves the baffle upward. In this way, the opening is opened, and the roller rolls down from the heating plate, thus completing the feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention.

[0014] Figure 2 It is a structural schematic diagram of the outer cylinder in the present invention.

[0015] Figure 3 It is a schematic diagram of the cross-sectional structure of the cylinder and the ring in the present invention.

[0016] Figure 4 It is a schematic diagram of the structure of the cylinder in the present invention.

[0017] In the figure: 1. supporting leg; 2. discharging pipe; 3. outer cylinder; 4. feeding funnel; 5. hydraulic rod; 6. heating mechanism; 7. unloading mechanism; 8. connecting plate; 9. moving cylinder; 10. guiding funnel; 11. baffle; 12. fixing block; 13. heating plate; 14. circular ring; 15. iron bar; 16. motor; 17. circular plate; 18. baffle; 19. connecting block; 20. connecting rod; 21. sealing ring; 22. leakage; 23. limiting block; 24. magnetic ring; 25. cylinder; 26. opening; 27. limiting groove. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-4 , the present invention provides a technical solution: In order to solve the problem that the end runout of the roller after heat treatment exceeds the process requirements, a process for reducing the end runout of the roller is now proposed.

[0020] Specific requirements Put the roller that has been turned and is to be heat treated (to detect roller surface stress) into a furnace at 450-500°C, keep it warm for 40-60 minutes, then take it out of the furnace and air cool it; After the rollers to be heat-treated have completed air cooling, stress testing is performed; The specific stress test results are as follows

[0021]

[0022]

[0023] 4. Data analysis: After this process heat treatment, the surface stress of the tapered roller changes from the original tensile stress to compressive stress. The roller end runout is improved, and some roller end runouts do not even change.

[0024] A heat treatment heating furnace for reducing roller end jump comprises an outer cylinder 3, a plurality of supporting legs 1 are fixed to the bottom of the outer cylinder 3, a feeding funnel 4 is fixed to the top of the outer cylinder 3, two heating mechanisms 6 are arranged inside the outer cylinder 3, the heating mechanism 6 comprises a cylinder 25, an electric heating plate 13 is fixed to the bottom of the cylinder 25, a plurality of fixing blocks 12 are fixed to the outer wall of the cylinder 25, the other end of the fixing block 12 is fixedly connected to the inner wall of the outer cylinder 3, a circular plate 17 is arranged above the cylinder 25, a circular ring 14 is arranged on the outer side of the circular plate 17, two connecting blocks 19 are fixed between the top of the circular ring 14 and the circular plate 17, a connecting rod 20 is slidably connected inside the connecting block 19, a sealing ring 21 is fixed to the bottom end of the connecting rod 20, a stopper 18 is fixed to the top of the connecting rod 20, a moving cylinder 9 is rotatably connected to the top of the circular plate 17, a motor 16 is fixed inside the moving cylinder 9, the output shaft of the motor 16 is fixedly connected to the top of the circular plate 17, and the moving cylinder 9 at the bottom Two connecting plates 8 are fixed to the outer wall, and two and one hydraulic rods 5 are fixed to the inner wall of the outer cylinder 3 and the top of the outer cylinder 3 respectively. The output shaft of the upper hydraulic rod 5 passes through the outer cylinder 3 and is fixedly connected to the top of the upper movable cylinder 9, and the output shafts of the two lower hydraulic rods 5 are fixedly connected to the top of the connecting plate 8. A discharge pipe 2 is fixed to the bottom of the outer cylinder 3, so that the roller can be heat treated at a lower temperature first to enhance the strength of the roller. After air cooling, high-temperature heat treatment is performed again, which can reduce the occurrence of end jump of the roller during high-temperature heat treatment. A material guide funnel 10 is fixed inside the outer cylinder 3, so that the roller can accurately enter the interior of the heating mechanism 6 below, and a plurality of leaks 22 are provided at the bottom of the feed funnel 4 and the bottom of the material guide funnel 10, so that the roller can leak out, and the sealing ring 21, the bottom end of the feed funnel 4 and the bottom end of the material guide funnel 10 are all located inside the cylinder 25, so that the roller will not leak outside the cylinder 25.

[0025] Furthermore, a feeding mechanism 7 is provided inside the cylinder 25, and the feeding mechanism 7 includes a plurality of baffles 11. A plurality of openings 26 are provided on the outer wall of the cylinder 25. The baffle 11 is located inside the opening 26. Two limiting grooves 27 are provided inside the opening 26. A limiting block 23 is provided inside the limiting groove 27. The limiting block 23 and the baffle 11 are fixedly connected so that the roller can leak down. A plurality of iron bars 15 are fixed inside the baffle 11, and a magnetic ring 24 is fixed on the outer wall of the ring 14 so that the ring 14 can rise and bring the baffle 11 up.

[0026] During operation, the rollers are poured into the feed hopper 4, and then the rollers leak from the leak 22 into the interior of the upper cylinder 25, and then the upper hydraulic rod 5 is started, and the upper hydraulic rod 5 pushes the upper moving cylinder 9 to move, and the upper moving cylinder 9 moves downward with the circular plate 17, the connecting block 19 and the circular ring 14, and the circular plate 17, the sealing ring 21 and the circular ring 14 seal the upper part of the cylinder 25. At the same time, the circular plate 17, the sealing ring 21 and the circular ring 14 are in contact with the rollers, and the electric heating plate 13 is started, and the electric heating plate 13 heats the rollers, and the motor 16 is started, and the circular plate 17, the sealing ring 21 and the circular ring 14 rotate with the rollers, so that the rollers are heated evenly, and the upper heating mechanism 6 heats the rollers at 450-500°C for 40-60 minutes and then air cools them. After air cooling, the upper hydraulic rod 5 retracts, and the hydraulic rod 5 moves upward with the circular plate 17, the connecting block 19 and the circular ring 14, and the circular plate 17, the sealing ring 21 and the circular ring 14. The ring 14 moves upward with the magnetic ring 24, and the magnetic ring 24 attracts the iron bar 15 and moves the baffle 11 upward, so that the opening 26 is opened, and the roller rolls down from the heating plate 13, thus completing the material unloading. The movement of the baffle 11 will move the limit block 23, and after the limit block 23 moves to the top of the limit groove 27, the limit groove 27 limits the movement of the limit block 23 and the baffle 11, and the circular ring 14 continues to rise with the magnetic ring 24, and the magnetic ring 24 and the iron bar 15 are separated. The baffle 11 drops back to its original position due to gravity, and after the roller leaks down, the roller enters the material guide funnel 10, and then the roller enters the heating mechanism 6 below, and the above operation is repeated. The heating mechanism 6 below performs high-temperature heat treatment on the roller, so that the roller is first subjected to low-temperature heat treatment to strengthen the strength of the roller. After air cooling, high-temperature heat treatment is performed again, which can reduce the occurrence of end jump when the roller is subjected to high-temperature heat treatment.

[0027] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for reducing roller end runout, characterized in that: Step 1: Place the roller that has been turned and is to be heat treated into a heat treatment furnace at 450-500°C, keep it warm for 40-60 minutes, then take it out of the furnace and air cool it; Step 2: After the roller to be heat-treated has been air-cooled, a stress test is performed; Step three, after the tapered roller is heat treated by this process, the roller surface stress changes from the original tensile stress to compressive stress; the roller end runout details are improved, and some roller end runouts do not even change.

2. A process for reducing roller end runout according to claim 1, characterized in that: The heat treatment heating furnace comprises an outer cylinder (3), a plurality of supporting legs (1) are fixed to the bottom of the outer cylinder (3), a feeding funnel (4) is fixed to the top of the outer cylinder (3), two heating mechanisms (6) are arranged inside the outer cylinder (3), the heating mechanism (6) comprises a cylinder (25), an electric heating plate (13) is fixed to the bottom of the cylinder (25), a plurality of fixing blocks (12) are fixed to the outer wall of the cylinder (25), the other end of the fixing block (12) is fixedly connected to the inner wall of the outer cylinder (3), a circular plate (17) is arranged above the cylinder (25), a circular ring (14) is arranged on the outer side of the circular plate (17), two connecting blocks (19) are fixed between the top of the circular ring (14) and the circular plate (17), and a connecting rod (20) is slidably connected to the inside of the connecting block (19), A sealing ring (21) is fixed to the bottom end of the connecting rod (20), a stopper (18) is fixed to the top of the connecting rod (20), the top of the circular plate (17) is rotatably connected to a moving cylinder (9), a motor (16) is fixed inside the moving cylinder (9), an output shaft of the motor (16) is fixedly connected to the top of the circular plate (17), two connecting plates (8) are fixed to the outer side wall of the moving cylinder (9) below, two and one hydraulic rods (5) are fixed to the inner side wall of the outer cylinder (3) and the top of the outer cylinder (3), respectively, the output shaft of the upper hydraulic rod (5) passes through the outer cylinder (3) and is fixedly connected to the top of the moving cylinder (9) above, the output shafts of the two lower hydraulic rods (5) are fixedly connected to the top of the connecting plate (8), and a discharge pipe (2) is fixed to the bottom of the outer cylinder (3).

3. A process for reducing roller end runout according to claim 2, characterized in that: A material discharge mechanism (7) is provided inside the cylinder (25), the material discharge mechanism (7) comprising a plurality of baffles (11), a plurality of openings (26) are provided on the outer wall of the cylinder (25), the baffles (11) are located inside the openings (26), two limit grooves (27) are provided inside the openings (26), a limit block (23) is provided inside the limit grooves (27), and the limit block (23) and the baffle (11) are fixedly connected.

4. A process for reducing roller end runout according to claim 3, characterized in that: A plurality of iron bars (15) are fixed inside the baffle (11), and a magnetic ring (24) is fixed to the outer side wall of the circular ring (14).

5. A process for reducing roller end runout according to claim 4, characterized in that: A material guiding funnel (10) is fixed inside the outer cylinder (3).

6. A process for reducing roller end runout according to claim 5, characterized in that: A plurality of leaking openings (22) are provided at the bottom of the feed funnel (4) and the bottom of the guide funnel (10).

7. A process for reducing roller end runout according to claim 6, characterized in that: The sealing ring (21), the bottom end of the feed funnel (4) and the bottom end of the guide funnel (10) are all located inside the cylinder (25).

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