Automatic hot forging and hot forging waste heat quenching device for batch nuts

Abstract

The utility model discloses an automatic hot forging and hot forging waste heat quenching device for batch nuts, which comprises an induction heating furnace, a manipulator punching machine, a quenching pool, a tempering mesh belt furnace and a charging box which are sequentially arranged, and a heating through hole is formed in the induction heating furnace; a concave sliding groove is formed between the induction heating furnace and the mechanical arm punching machine, a chain conveying belt is arranged on the discharging side of the mechanical arm punching machine, the tail end of the chain conveying belt is located above the quenching pool, a lifting conveying belt is arranged in the quenching pool, and the discharging end of the lifting conveying belt is located above an inlet of the tempering mesh belt furnace. A first infrared temperature measuring system is arranged on the concave chute; a second infrared temperature measuring system is arranged at the tail end of the chain conveyor belt. The hot forging waste heat is used for replacing secondary heating of a quenching mesh belt furnace, the product turnover frequency is reduced, the labor cost is saved, the production time is shortened, the requirement for batch nut production is met, and the cost reducing and benefit increasing effects of enterprises are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the field of hot processing equipment for hot forging and quenching of nuts, and in particular to a batch of automatic hot forging and hot forging residual heat quenching devices for nuts. Background Art

[0002] Wind power generation uses wind power to drive the windmill blades to rotate, and increases the speed of rotation through the speed increaser to drive the generator to generate electricity. The development prospects of China's wind power and other new energy power generation industries are very broad, and it is expected that they will maintain rapid development for a long time in the future. The rapid development of China's wind power has also brought an unprecedented market for the development of the domestic fastener industry. As the most commonly used fasteners in the wind power new energy industry, wind power nut products are undoubtedly one of the most important products produced in batches by fastener manufacturers. M36 and above alloy steel nuts are basically all produced in batches by hot forging. The current hot forging and heat treatment process of wind power nuts is to heat a certain size of bar material through an induction heating furnace as a whole, and after reaching a certain temperature, use a punch press to stamp and form each piece to reach the specified nut blank size, and then transfer and heat treat. During heat treatment, it is usually heated in a No. 1 mesh belt furnace and then quenched, and then sent to the No. 2 mesh belt furnace for heating and tempering. After heat treatment, mechanical processing, inspection and packaging are carried out. Therefore, the existing heat treatment process after hot forging of batch nuts requires secondary material transfer and secondary heating, which has problems such as low utilization rate of hot forging waste heat and risk of product mixing. In addition, the process flow and equipment need to be simplified, and work efficiency needs to be improved. Summary of the invention

[0003] The utility model aims to provide a batch nut automatic hot forging and hot forging residual heat quenching device, which connects the hot forging equipment and the quenching equipment to operate online, utilizes the hot forging residual heat to directly perform quenching heat treatment, does not require secondary heating in a quenching furnace, reduces product transfer, and improves production efficiency on the basis of reducing costs.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A device for automated hot forging and hot forging residual heat quenching of batch nuts comprises an induction heating furnace, a manipulator punch, a quenching tank, a tempering mesh belt furnace and a charging box which are arranged in sequence, wherein a heating through hole is arranged in the induction heating furnace; a concave slide is arranged between the induction heating furnace and the manipulator punch, a chain conveyor is arranged on the discharge side of the manipulator punch, the end of the chain conveyor is located above the quenching tank, a lifting conveyor is arranged in the quenching tank, and the discharge end of the lifting conveyor is located above the entrance of the tempering mesh belt furnace.

[0006] Furthermore, a first infrared temperature measuring system is provided on the concave chute, and the first infrared temperature measuring system is used to measure the temperature of the bar material after being heated by the induction heating furnace.

[0007] Furthermore, a second infrared temperature measuring system is arranged at the end of the chain conveyor belt, and the second infrared temperature measuring system is used to measure the temperature of the nuts that are about to fall into the quenching pool.

[0008] Furthermore, the concave chute is made of a high temperature resistant material with a smooth surface.

[0009] Furthermore, the lifting conveyor belt is in a "Z" shape, with the bottom of the feeding section parallel to the bottom of the quenching tank, the middle section inclined upward, and the bottom of the discharging section parallel to the entrance of the tempering mesh belt furnace.

[0010] Preferably, baffles are provided on both sides of the lifting conveyor belt.

[0011] Furthermore, the robot punching machine includes a ball pressing system, a hot forging forming system, and a punching system, and the chain conveyor belt is on the same horizontal line as the ball pressing system, the forming system, and the punching system.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The inventor has designed and manufactured composite equipment for hot forging and heat treatment processes through research and analysis on the hot forging process and quenching process of nuts, and connected the hot forging equipment and the quenching equipment to operate online. The residual heat of the nuts after hot forging is used to directly perform quenching heat treatment, thus eliminating the need for a quenching heating furnace and reducing the heating process for separate quenching heat treatment of nuts. This simplifies the nut production process, improves production efficiency, and especially reduces the consumption of electric energy and reduces production costs.

[0014] 2. The utility model is an automatic hot forging and hot forging residual heat quenching device for batch nuts, which has an ingenious structural design and organically combines hot forging with heat treatment. It does not require secondary heating or secondary material transfer, reduces work intensity and difficulty, shortens production time, improves work efficiency, reduces the risk of product mixing, saves labor costs, improves product quality, meets the needs of batch nut production, and significantly improves the cost reduction and efficiency improvement effects of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a stereoscopic diagram of the automatic hot forging and hot forging residual heat quenching device for batch nuts of the utility model;

[0016] Figure 2 This is a front view of the automatic hot forging and hot forging residual heat quenching device for batch nuts of the utility model;

[0017] Figure 3 for Figure 1 A top view of the connection details between the robot punch press and the quenching pool;

[0018] In the figure: 1-induction heating furnace, 2-heating through hole, 3-first infrared temperature measuring system, 4-concave slide, 5-manipulator punching machine, 6-second infrared temperature measuring system, 7-chain conveyor belt, 8-quenching pool, 9-lifting conveyor belt, 10-tempering mesh belt furnace, 11-charging box, 12-nut, 13-ball pressing system, 14-hot forging system, 15-punching system, 16-bar stock. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] See also Figure 1-3 The present embodiment provides a hot forging and hot forging residual heat quenching device for batch nuts 12, comprising an induction heating furnace 1, a manipulator punch 5, a quenching pool 8, a tempering mesh belt furnace 10, and a charging box 11 which are arranged in sequence. A heating through hole 2 is provided in the induction heating furnace 1; a concave chute 4 is provided between the induction heating furnace 1 and the manipulator punch 5, a chain conveyor 7 is provided on the discharge side of the manipulator punch 5, and the end of the chain conveyor 7 is located above the quenching pool 8. A lifting conveyor 9 is provided in the quenching pool 8, and the discharge end of the lifting conveyor 9 is located above the entrance of the tempering mesh belt furnace 10.

[0021] Specifically, the concave chute 4 is provided with a first infrared temperature measuring system 3, which is used to measure the temperature of the bar material 16 after being heated by the induction heating furnace 1; the end of the chain conveyor 7 is provided with a second infrared temperature measuring system 6, which is used to measure the temperature of the nut 12 that is about to fall into the quenching pool 8. In this embodiment, the first infrared temperature measuring system 3 and the second infrared temperature measuring system 6 both include an infrared temperature sensor (not shown in the figure) and a display screen connected to the infrared temperature sensor. The first infrared temperature measuring system 3 measures the initial forging temperature at any time to ensure that the hot forging process is within the set temperature range; the second infrared temperature measuring system 6 measures the final forging temperature at any time to ensure that the residual heat after hot forging is within the set quenching temperature range, thereby ensuring the hardenability of the product.

[0022] Specifically, the concave chute 4 is made of a high-temperature resistant material with a smooth surface, so that the heated bar material 16 can fall smoothly to the ball pressing system 13 of the robot punch 5 .

[0023] Specifically, the lifting conveyor belt 9 is in a "Z" shape, with the bottom of the feeding section parallel to the bottom of the quenching pool 8, the middle section inclined upward, and the bottom of the discharging section parallel to the entrance of the tempering mesh belt furnace 10. Baffles are provided on both sides of the lifting conveyor belt 9 to prevent the nuts 12 from falling into the quenching pool 8 for the second time during the lifting process.

[0024] Specifically, the manipulator punch 5 includes a ball pressing system 13, a hot forging forming system 14, and a punching system 15, and the chain conveyor 7 is on the same horizontal line as the ball pressing system 13, the forming system, and the punching system 15. The manipulator punch 5 in this embodiment uses existing equipment, and no specific description is given to the ball pressing system 13, the forming system, and the punching system 15. The chain conveyor 7 is provided with a transmission speed adjustment system, such as a variable frequency stepless speed regulating motor, the main purpose of which is to control the temperature of the nut 12 when it is about to fall into the quenching pool 8.

[0025] Specifically, the quenching pool 8 is square in shape, has a wide space, and is equipped with an external cooling system to ensure that the quenching liquid temperature is not higher than 45°C. The cooling system can adopt existing structures such as external circulation and plate heat exchanger. The cooling system is not described in detail in this embodiment.

[0026] The working principle of the utility model is as follows: the hot forging bar 16 enters the heating through hole 2 of the induction heating furnace 1 at a certain speed for heating. After being heated to a certain temperature, the bar 16 is pushed out from the outlet of the heating through hole 2 and naturally falls from the concave chute 4 to the ball pressing system 13 of the manipulator punch 5. The red-hot bar 16 is punched into a drum shape through the reciprocating punching motion of the manipulator punch 5, i.e., the ball pressing process. After the ball pressing is completed, the drum-shaped material is clamped into the forming lower die of the hot forging forming system 14 in the middle of the punch by the punch manipulator, and the drum-shaped material is punched and formed by the reciprocating punching motion. After forming, the drum-shaped material is punched and formed by the punch. The bed manipulator clamps the molding material to the punching system 15. After the punching is completed, the molded product will be transported to the quenching pool 8 through the chain conveyor 7. The quenching pool 8 adds the corresponding quenching liquid according to the heat treatment system. The "Z"-shaped lifting conveyor 9 set at the bottom of the quenching pool 8 transports the quenched nuts 12 to the inlet of the tempering mesh belt furnace 10. The heating temperature and transmission speed of the tempering mesh belt furnace 10 are set according to the material and performance requirements of the nuts 12. After the entire tempering process is completed, the nuts 12 fall into the charging box 11 from the outlet of the tempering mesh belt furnace 10, and finally complete all the hot forging and heat treatment processes to achieve the expected effect. The utility model uses the waste heat of hot forging to replace the secondary heating of the quenching mesh belt furnace, reduces the number of product turnovers, does not require secondary heating and secondary material transfer, reduces the risk of product mixing, and improves product quality.

[0027] The following is an example of the hot forging and residual heat quenching process steps for the wind turbine nut 12 with national standard and specification level GB / T6170-M36-10:

[0028] Step 1: Prepare a certain number of bars 16 according to the requirements. The specifications and materials of the bars 16 are 35CrMoA of φ36 as an example. First, use a sawing machine to saw the raw materials into bars 16 of φ36*60. Then use a loader to push the bars 16 to the entrance of the induction heating furnace 1. Turn on the induction heating furnace 1, and push the bars 16 into the heating through holes 2 of the induction heating furnace 1 in turn to gradually heat them.

[0029] Step 2: According to the external dimensions of GB / T6170-M36, debug the various systems, molds and transmission mechanisms of the manipulator punch 5, turn on the punch, and let the bars 16 heated in step 1 be pushed out from the outlet of the induction heating furnace 1 piece by piece, and then slide naturally from the concave chute 4. During the sliding process, the temperature of the bars 16 needs to be calibrated and measured by the first infrared temperature measurement system 3 to ensure that the temperature reaches the starting forging temperature. The 35CrMoA of φ36 is generally adjusted to 980±10℃;

[0030] Step 3: After the above adjustments, the hot forging process is officially started. The bar 16 is first pressed into a drum shape in the ball pressing system 13 by the reciprocating punching motion of the manipulator punch 5 for subsequent forming. After the ball pressing is completed, it enters the intermediate hot forging forming system 14, and the drum-shaped semi-finished product is placed in the forming die (i.e., M36-GB / T6170 hexagonal nut). The drum-shaped semi-finished product is again punched into a hexagonal nut 12 blank by the reciprocating punching motion of the manipulator punch 5. After the forming is completed, it enters the last step of hot forging, the punching system 15. At this stage, the inner hole in the middle of the hexagonal nut 12 blank is punched through for subsequent flat boring processing;

[0031] Step 4: The above steps complete the entire hot forging process, and then enter the heat treatment process. After the punching is completed in step 3, the nut 12 enters the chain conveyor 7, and is driven by the chain to the instant point at the end of the chain about to fall into the quenching pool 8. The second infrared temperature measurement system 6 is used to calibrate and measure the residual heat temperature of the M36 nut 12 material 35CrMoA after hot forging. It is necessary to ensure that the quenching temperature is reached, which is generally 830±5℃. After the speed of the chain conveyor 7 is adjusted to make the temperature appropriate, the nuts 12 fall into the quenching pool 8 one by one for quenching treatment;

[0032] Step 5: After quenching, the nut 12 is transported to the tempering mesh belt furnace 10 through the lifting conveyor belt 9 for tempering treatment. The tempering temperature is set to 560±5℃ and the time is 100min. Finally, the nut 12 gradually falls into the charging box 11 for inspection and transfer, completing the entire heat treatment process.

[0033] After the above steps are adjusted appropriately, it belongs to continuous production on the line, without the need for secondary heating and sequence change in the middle, hot forging + heat treatment can be completed at one time, the production efficiency is increased by more than 50%, the quality consistency is improved, and the cost reduction and efficiency improvement effect is obvious.

[0034] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

Claims

1. A batch nut automatic hot forging and hot forging residual heat quenching device, characterized in that: It includes an induction heating furnace, a robot punch, a quenching pool, a tempering mesh belt furnace, and a charging box which are arranged in sequence. A heating through hole is arranged in the induction heating furnace. A concave slide is arranged between the induction heating furnace and the robot punch. A chain conveyor belt is arranged on the discharge side of the robot punch. The end of the chain conveyor belt is located above the quenching pool. A lifting conveyor belt is arranged in the quenching pool. The discharge end of the lifting conveyor belt is located above the entrance of the tempering mesh belt furnace.

2. The automatic hot forging and hot forging residual heat quenching device for batch nuts according to claim 1 is characterized by: The concave chute is provided with a first infrared temperature measuring system, and the first infrared temperature measuring system is used to measure the temperature of the bar material after being heated by the induction heating furnace.

3. The automatic hot forging and hot forging residual heat quenching device for batch nuts according to claim 1 is characterized in that: A second infrared temperature measuring system is arranged at the end of the chain conveyor belt, and the second infrared temperature measuring system is used to measure the temperature of the nuts that are about to fall into the quenching pool.

4. The automatic hot forging and hot forging residual heat quenching device for batch nuts according to claim 1 is characterized in that: The concave chute is made of high temperature resistant material with a smooth surface.

5. The automatic hot forging and hot forging residual heat quenching device for batch nuts according to claim 1 is characterized by: The lifting conveyor belt is in a "Z" shape, with the bottom of the feeding section parallel to the bottom of the quenching tank, the middle section inclined upward, and the bottom of the discharging section parallel to the entrance of the tempering mesh belt furnace.

6. The automatic hot forging and hot forging residual heat quenching device for batch nuts according to claim 5, characterized in that: Baffles are arranged on both sides of the lifting conveyor belt.

7. The automatic hot forging and hot forging residual heat quenching device for batch nuts according to claim 1 is characterized by: The manipulator punching machine comprises a ball pressing system, a hot forging forming system and a punching system, and the chain conveyor belt, the ball pressing system, the forming system and the punching system are on the same horizontal line.

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