Normalizing furnace for bearing forgings

Abstract

The invention relates to the technical field of bearing forging manufacturing, in particular to a normalizing furnace for bearing forgings, which comprises a rack, a furnace body fixedly mounted at the top of the rack, a conveying table mounted in the furnace body, a first heat supply box arranged on one side of the top of the conveying table, and a second heat supply box arranged on one side of the bottom of the conveying table. Electric heating pipes are arranged in the conveying table, the first heat supply box and the second heat supply box; an air duct and an air feeder are fixedly installed at the top of the furnace body, one end of the top of the air duct is communicated with an air outlet of the air feeder through a ventilation pipe, and one end of the bottom of the air duct is communicated with the conveying table. According to the normalizing furnace, in the normalizing and cooling process of the bearing forge piece, the temperature in the furnace body where the bearing forge piece is located is gradually reduced, the early-stage cooling rate is low, the later-stage cooling rate is high, the influence of the temperature difference on the bearing forge piece is reduced, deformation damage to the bearing forge piece due to the environment temperature difference is avoided, and the production quality of the bearing forge piece is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of bearing forging manufacturing, and in particular discloses a normalizing furnace used for bearing forgings. Background Art

[0002] Bearing forgings are metal products with specific shapes and sizes formed by plastic deformation of metal blanks under external pressure; therefore, bearing forgings are widely used in high-temperature, heavy-load or high-speed working environments. In order to improve the mechanical properties of bearing forgings such as strength, toughness and fatigue life, bearing forgings generally need to undergo heat treatment processes such as quenching, tempering, normalizing and annealing during the processing and manufacturing process; the above heat treatment processes can not only change the strength of the metal blank surface, but more importantly, optimize the grain structure inside the metal blank, so that the bearing forgings can work stably in heavy-load, high-temperature and high-speed environments.

[0003] Normalizing is a relatively important heat treatment process in bearing forgings. After the bearing forgings are preheated to a predetermined temperature, they are kept warm for a period of time, and then exposed to the air. The operators accelerate the cooling rate of the bearing forgings by adding cooling media such as spraying water, mist or blowing air, so that the temperature of the bearing forgings is quickly reduced to room temperature. In the above-mentioned prior art, although the cooling of the bearing forgings can be accelerated by applying cooling media, due to the temperature difference between the surface temperature of the bearing forgings and the cooling medium, the temperature difference can easily cause the bearing forgings to undergo plastic deformation, which may cause cracks or cracks in the bearing forgings in severe cases, making it difficult to ensure the production quality of the bearing forgings. Summary of the invention

[0004] In view of the problem that in the current production and manufacturing of bearing forgings, due to the large temperature difference in the normalizing process, the production quality of bearing forgings is difficult to meet the requirements, the present invention provides a normalizing furnace for bearing forgings.

[0005] To solve the above problems, the present invention provides the following technical solutions: A normalizing furnace for bearing forgings comprises a stand, a furnace body is fixedly mounted on the top of the stand, a conveying platform for conveying bearing forgings is mounted in the furnace body, a first heating box tightly connected to the inner wall of the furnace body is arranged on one side of the top of the conveying platform, a second heating box tightly connected to the inner wall of the furnace body is arranged on one side of the bottom of the conveying platform, and electric heating tubes for continuously supplying heat are arranged in the conveying platform, the first heating box and the second heating box; an air duct and a blower are fixedly mounted on the top of the furnace body, a top end of the air duct is connected to the air outlet of the blower through a ventilation pipe, and a bottom end of the air duct is connected to the conveying platform.

[0006] Preferably, the furnace body is provided with an inlet and an outlet, and an active roller and a driven roller are respectively installed at both ends of the conveying platform. A conveyor belt is commonly wound around the active roller and the driven roller, and the outer surface of the conveyor belt is in contact with the bearing forging. The two ends of the conveyor belt are respectively arranged on the outside of the inlet and the outlet.

[0007] Preferably, both ends of the active roller are equipped with a first roller seat for rotational cooperation, and the first roller seat is tightly connected to the side of the conveying platform; a first servo motor is fixedly installed on the side of one side of the conveying platform, and the output shaft of the first servo motor is transmission-connected to the active roller, and the outer shell of the first servo motor is tightly connected to the outer wall of the furnace body through a support frame.

[0008] Preferably, both ends of the driven roller are equipped with a second roller seat for rotational cooperation, the second roller seat is arranged on the side of the conveying platform, and limiting grooves are provided on both sides of the conveying platform. The second roller seat is slidingly cooperated with the inner groove surface of the limiting groove, and limiting strips are provided on the top and bottom of the second roller seat. The limiting strips are tightly connected to the conveying platform, and the inner side of the limiting strips is slidingly cooperated with the second roller seat.

[0009] Preferably, a reference block fastened to the conveying platform is provided on the side of the limiting groove, a screw is installed on the internal thread of the reference block, a ring is fixedly installed on the end of one end of the screw, and a groove engaged with the ring is provided in the second roller seat.

[0010] Preferably, the first heating box and the second heating box are provided with vents on the side facing the conveying platform to facilitate heat dissipation, and symmetrically arranged ventilation holes are provided on both sides of the conveying platform. A rounded corner is provided at one end of the bottom of the air duct, and the rounded corner is tightly connected to the periphery of the ventilation hole.

[0011] Preferably, the temperature parameter in the first heating box is greater than the temperature parameter in the second heating box, and the temperature parameter in the second heating box is greater than the temperature parameter in the conveying platform.

[0012] Preferably, a plurality of support beams are fixedly mounted on the outer side of the furnace body, a through slot opening outward is provided inside the support beam, a heat insulation board is installed between two support beams, and two sides of the heat insulation board are slidably matched with the inside of the through slot.

[0013] Preferably, the blower is arranged on the inner side of the wind duct, and a second servo motor for driving is fixedly installed on the blower. The air outlet of the blower is arranged upward and a wind box is fixedly installed. Wind outlets are provided on both sides of the wind box, and the wind outlets are connected to the ventilation duct.

[0014] Preferably, wheel seats are rotatably mounted at the four corners of the bottom of the stand, and casters are rotatably mounted in the wheel seats.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The conveying platform in the present invention can smoothly convey the bearing forgings so that they enter the interior of the furnace body. After the electric heating tube is energized, the temperature of the first heating box, the second heating box and the conveying platform can be gradually increased. During the stay of the bearing forgings in the furnace body, the blower conveys external room temperature air to the interior of the conveying platform. The first heating box and the second heating box gradually send the high-temperature air inside them into the inner cavity of the furnace body. As time goes by, the internal temperature of the first heating box and the second heating box gradually decreases and eventually becomes the same as the internal temperature of the conveying platform, thereby achieving the purpose of normalizing and cooling. During the normalizing and cooling process of the bearing forgings by the normalizing furnace in the present invention, the internal temperature of the furnace body where the bearing forgings are located gradually decreases, so that the cooling rate in the early stage is lower and the cooling rate in the later stage is higher, thereby reducing the influence of the temperature difference on the bearing forgings, avoiding deformation and damage to the bearing forgings due to the ambient temperature difference, and ensuring the production quality of the bearing forgings. Therefore, it has a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a schematic diagram of the installation structure of the first heating box and the second heating box of the present invention; Figure 4 for Figure 3 A schematic diagram of the structure enlargement in the middle; Figure 5 for Figure 3 A magnified schematic diagram of the structure at B in the middle; Figure 6 It is a schematic diagram of the ventilation opening structure of the present invention; Figure 7 It is a schematic diagram of the ventilation hole structure of the present invention; Figure 8 It is a schematic diagram of the support beam structure of the present invention; Fig. 9 It is a schematic diagram of the installation structure of the air box of the present invention; In the figure: 1. stand, 2. furnace body, 3. conveyor platform, 4. first heating box, 5. second heating box, 6. electric heating tube, 7. air duct, 8. blower, 9. ventilation pipe, 10. inlet, 11. outlet, 12. active roller, 13. driven roller, 14. conveyor belt, 15. first roller seat, 16. first servo motor, 17. support frame, 18. second roller seat, 19. limit groove, 20. limit strip, 21. reference block, 22. screw, 23. ring, 24. groove, 25. vent, 26. vent, 27. fillet, 28. support beam, 29. through groove, 30. insulation board, 31. second servo motor, 32. bellows, 33. wheel seat, 34. caster. DETAILED DESCRIPTION

[0017] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below 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.

[0018] This specific embodiment provides a normalizing furnace for bearing forgings, such as Figure 1-Figure 9 As shown, it includes a stand 1, and wheel seats 33 are rotatably installed at the four corners of the bottom of the stand 1. Four wheel seats 33 are provided and are rotatably connected to the stand 1 through pins. A caster 34 is rotatably installed in each wheel seat 33. The caster 34 can rotate with the wheel seat 33, so as to adjust the direction of the caster 34, so as to facilitate moving the equipment to the normalizing process area of ​​the bearing forging.

[0019] A furnace body 2 is fixedly installed on the top of the stand 1. The furnace body 2 is a square structure. The bottom of the furnace body 2 is fixedly installed with the stand 1. The furnace body 2 is provided with an internal cavity. The front end opening of the furnace body 2 is an outlet 11, and the rear end opening of the furnace body 2 is an inlet 10. A conveyor platform 3 is fixedly installed in the internal cavity of the furnace body 2. An active roller 12 and a driven roller 13 are respectively installed at both ends of the conveyor platform 3. The active roller 12 is arranged on the outside of the inlet 10, and the driven roller 13 is arranged on the outside of the outlet 11; a conveyor belt 14 is wound around the active roller 12 and the driven roller 13. The conveyor belt 14 can be made of high temperature and heat resistant rubber material. The outer surface of the conveyor belt 14 is in contact with the bearing forging. The two ends of the conveyor belt 14 are respectively arranged on the outside of the inlet 10 and the outlet 11.

[0020] Both ends of the active roller 12 are equipped with first roller seats 15 for rotational cooperation, and the two first roller seats 15 are tightly connected to the side of the conveying platform 3. Bearings that rotate with the active roller 12 are installed in the two first roller seats 15; a first servo motor 16 is fixedly installed on the side of one side of the conveying platform 3, and the output shaft of the first servo motor 16 is transmission-connected to the active roller 12, so that the first servo motor 16 continuously drives the active roller 12 to rotate, and the outer shell of the first servo motor 16 is tightly connected to the rear end outer wall of the furnace body 2 through the support frame 17, so that the first servo motor 16 is fixedly installed at the rear end of the equipment, thereby enhancing the stability of the first servo motor 16. Both ends of the driven roller 13 are equipped with second roller seats 18 for rotational cooperation. The two second roller seats 18 are arranged on the side of the conveying platform 3. Limiting grooves 19 are provided on both sides of the conveying platform 3. The limiting grooves 19 are arranged on the inner side of the second roller seats 18. The inner side of the second roller seat 18 is slidably matched with the inner groove surface of the limiting groove 19. The top and bottom of the second roller seat 18 are provided with limiting strips 20. Two limiting strips 20 are provided and are both tightly connected to the conveying platform 3. The inner side of the limiting strips 20 is slidably matched with the second roller seat 18. A reference block 21 tightly connected to the conveying platform 3 is provided on the side of the limiting groove 19. A screw 22 is installed on the internal thread of the reference block 21. A ring 23 is fixedly installed on the end of one end of the screw 22. A groove 24 engaged with the ring 23 is provided in the second roller seat 18. By setting the matching structure of the screw 22, the ring 23 and the groove 24, the screw 22 can be used to adjust the layout position of the second roller seat 18, thereby adjusting the distance between the driven roller 13 and the furnace body 2, shortening or increasing the exposure time of the bearing forging to the external environment, thereby adapting to a variety of normalizing processes.

[0021] A first heating box 4 is provided on the top side of the conveying platform 3 and is connected to the inner wall of the furnace body 2. A second heating box 5 is provided on the bottom side of the conveying platform 3 and is connected to the inner wall of the furnace body 2. Electric heating pipes 6 for continuously supplying heat are provided in the conveying platform 3, the first heating box 4 and the second heating box 5. The electric heating pipes 6 can be connected to an external power supply device through a cable to provide power to the electric heating pipes 6, thereby increasing the temperature in the conveying platform 3, the first heating box 4 and the second heating box 5. Ventilation holes 25 are provided on the side of the first heating box 4 and the second heating box 5 facing the conveying platform 3 to facilitate heat dissipation, so that the first heating box 4 and the second heating box 5 can blow hot air toward the conveying platform 3.

[0022] The top of the furnace body 2 is fixedly installed with a wind tube 7 and a blower 8. The wind tube 7 is provided with two groups, and each group is provided with two blowers. The two groups of wind tubes 7 are arranged at the front and rear ends of the furnace body 2, and the two wind tubes 7 of each group are arranged on both sides of the furnace body 2; the blowers 8 are provided with two blowers, and each blower 8 is connected to the wind tube 7 through a ventilation pipe 9, so that external room temperature air is input into the wind tube 7. The bottom end of the wind tube 7 is connected to the conveying platform 3, and both sides of the conveying platform 3 are provided with symmetrically arranged vents 26. There are four vents 26 in total and they are connected to each wind tube 7 respectively. The bottom end of each wind tube 7 is provided with a rounded corner 27, and the rounded corner 27 is tightly connected to the periphery of the vent 26, so that the blower 8 continuously blows room temperature air into the conveying platform 3.

[0023] Among them, the temperature parameter in the first heating box 4 is greater than the temperature parameter in the second heating box 5, and the temperature parameter in the second heating box 5 is greater than the temperature parameter in the conveying platform 3; thereby making the temperature at the bottom of the furnace body 2 lower than the temperature at the top of the furnace body 2, and making the temperature in the conveying platform 3 lower than the temperature inside the furnace body 2.

[0024] Among them, each blower 8 is fixedly installed with a second servo motor 31 for driving, so that the second servo motor 31 can effectively control the air supply of the blower 8; the air outlet of the blower 8 is arranged upward and a wind box 32 is fixedly installed, and wind ports are provided on both sides of the wind box 32, and the wind ports are connected to the ventilation pipe 9; by providing the wind box 32, it is convenient to buffer the air pressure, thereby avoiding pressure shock to the ventilation pipe 9 and the wind tube 7, and improving the stability of the overall equipment during operation.

[0025] In addition, a plurality of support beams 28 are fixedly installed on the outer side of the furnace body 2. The support beams 28 on both sides are symmetrically arranged. A through groove 29 opening outward is provided inside each support beam 28. A heat insulation board 30 is installed between two adjacent support beams 28. The two sides of the heat insulation board 30 slide in cooperation with the inside of the through groove 29, so that the heat insulation board 30 can be flexibly installed on the outer side of the furnace body 2. On the one hand, it is convenient for heat preservation of the furnace body 2. On the other hand, it increases the flexibility of the furnace body 2 and facilitates disassembly and assembly operations.

[0026] The working principle of the present invention is: The bearing forgings can be placed on the conveyor belt 14, and the conveyor belt 14 is driven to allow the bearing forgings to enter the inner cavity of the furnace body 2 from the inlet 10 at the rear end of the furnace body 2; after each electric heating tube 6 is energized, the temperature of the first heating box 4, the second heating box 5 and the conveying platform 3 can be gradually increased, and the temperature of the first heating box 4 can be greater than that of the second heating box 5 and greater than that of the conveying platform 3. After the bearing forgings are sent to the furnace body 2 by the conveyor belt 14, the bearing forgings can stay inside the furnace body 2 for 5-10 minutes; during this period, the blower 8 conveys external room temperature air to the inside of the conveyor platform 3 through the ventilation pipe 9 and the air duct 7, so that the temperature inside the conveyor platform 3 is slightly higher than the external room temperature, and the first heating box 4 and the second heating box 5 gradually send their internal high-temperature air into the inner cavity of the furnace body 2, and as time goes by, the internal temperature of the first heating box 4 and the second heating box 5 gradually decreases, and finally becomes the same as the internal temperature of the conveyor platform 3; then the conveyor belt 14 can send the bearing forgings out of the furnace body 2 through the outlet 12, and expose them to the external room temperature for a period of time, so that the surface temperature of the bearing forgings is reduced to the room temperature level. During the above-mentioned normalizing and cooling process, the internal temperature of the furnace body 2 where the bearing forgings are located gradually decreases. The cooling rate of the temperature curve is low in the early stage and high in the later stage, which can avoid deformation and damage to the bearing forgings due to the environmental temperature difference, and ensure that the production quality of the bearing forgings meets the requirements.

[0027] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A normalizing furnace for bearing forgings, comprising a stand (1), characterized in that: A furnace body (2) is fixedly mounted on the top of the stand (1); a conveying platform (3) for conveying bearing forgings is installed in the furnace body (2); a first heating box (4) is arranged on one side of the top of the conveying platform (3) and is tightly connected to the inner wall of the furnace body (2); a second heating box (5) is arranged on one side of the bottom of the conveying platform (3) and is tightly connected to the inner wall of the furnace body (2); electric heating pipes (6) are arranged in the conveying platform (3), the first heating box (4) and the second heating box (5) for continuously supplying heat; a wind tube (7) and a blower (8) are fixedly mounted on the top of the furnace body (2); a top end of the wind tube (7) is connected to an air outlet of the blower (8) via a ventilation pipe (9); and a bottom end of the wind tube (7) is connected to the conveying platform (3).

2. A normalizing furnace for bearing forgings according to claim 1, characterized in that: The furnace body (2) is provided with an inlet (10) and an outlet (11), and the two ends of the conveying platform (3) are respectively installed with a driving roller (12) and a driven roller (13), and a conveying belt (14) is wound around the driving roller (12) and the driven roller (13), and the outer surface of the conveying belt (14) is in contact with the bearing forging, and the two ends of the conveying belt (14) are respectively arranged on the outside of the inlet (10) and the outlet (11).

3. A normalizing furnace for bearing forgings according to claim 2, characterized in that: Both ends of the active roller (12) are provided with first roller seats (15) that are rotatably matched, and the first roller seats (15) are tightly connected to the side of the conveying platform (3); a first servo motor (16) is fixedly installed on the side of one side of the conveying platform (3), the output shaft of the first servo motor (16) is transmission-connected to the active roller (12), and the housing of the first servo motor (16) is tightly connected to the outer wall of the furnace body (2) via a support frame (17).

4. A normalizing furnace for bearing forgings according to claim 2, characterized in that: Both ends of the driven roller (13) are provided with a second roller seat (18) for rotational engagement. The second roller seat (18) is arranged on the side of the conveying platform (3). Limiting grooves (19) are provided on both sides of the conveying platform (3). The second roller seat (18) is slidably engaged with the inner groove surface of the limiting groove (19). Limiting strips (20) are provided on the top and bottom of the second roller seat (18). The limiting strips (20) are tightly connected to the conveying platform (3). The inner side of the limiting strip (20) is slidably engaged with the second roller seat (18).

5. A normalizing furnace for bearing forgings according to claim 4, characterized in that: A reference block (21) is provided on the side of the limiting groove (19) and is tightly connected to the conveying platform (3); a screw rod (22) is installed in the internal thread of the reference block (21); a circular ring (23) is fixedly installed at the end of one end of the screw rod (22); and a groove (24) is provided in the second roller seat (18) and is engaged with the circular ring (23).

6. A normalizing furnace for bearing forgings according to claim 1, characterized in that: The first heating box (4) and the second heating box (5) are provided with ventilation holes (25) on the side facing the conveying platform (3) for facilitating heat dissipation, and the two sides of the conveying platform (3) are provided with symmetrically arranged ventilation openings (26), and a rounded corner portion (27) is provided at one end of the bottom of the air duct (7), and the rounded corner portion (27) is tightly connected to the periphery of the ventilation opening (26).

7. A normalizing furnace for bearing forgings according to claim 1, characterized in that: The temperature parameter in the first heating box (4) is greater than the temperature parameter in the second heating box (5), and the temperature parameter in the second heating box (5) is greater than the temperature parameter in the conveying platform (3).

8. A normalizing furnace for bearing forgings according to claim 1, characterized in that: A plurality of support beams (28) are fixedly mounted on the outside of the furnace body (2), a through slot (29) opening outward is provided inside the support beam (28), a heat insulation board (30) is mounted between two support beams (28), and two sides of the heat insulation board (30) are slidably matched with the inside of the through slot (29).

9. A normalizing furnace for bearing forgings according to claim 1, characterized in that: The blower (8) is arranged inside the air duct (7), and a second servo motor (31) for driving the blower (8) is fixedly mounted on the blower (8). The air outlet of the blower (8) is arranged upward and a wind box (32) is fixedly mounted thereon. Both sides of the wind box (32) are provided with wind outlets, and the wind outlets are connected to the ventilation pipe (9).

10. A normalizing furnace for bearing forgings according to claim 1, characterized in that: Wheel seats (33) are rotatably mounted at the four corners of the bottom of the stand (1), and casters (34) are rotatably mounted in the wheel seats (33).

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