Rapid air-blast quenching device for heat treatment of fine and thin-wall workpieces

Abstract

The utility model belongs to the technical field of metal heat treatment quenching, and particularly relates to a rapid air-blast quenching device for heat treatment of fine and thin-wall workpieces, which comprises a workpiece conveying mechanism, an air-cooling mechanism and a refrigerating unit, a high-temperature workpiece is placed on the workpiece conveying mechanism, and external air is introduced into the refrigerating unit. An air outlet of the refrigerating unit communicates with an air inlet of the air cooling mechanism, and an air outlet of the air cooling mechanism faces the workpiece conveying mechanism. The refrigerating unit is additionally arranged, external air is refrigerated through the refrigerating unit and then is blown to a high-temperature workpiece for cooling, the cooling effect is good, the problem that the hardness of the quenched and cooled metal part is not enough is solved, and the shape and the metallographic structure of a product subjected to air-blast quenching are more stable and can be kept in a better second level; according to the utility model, the high-temperature workpiece is quickly cooled by air cooling, no oil medium exists, the potential safety hazard is reduced, the environmental pollution is reduced, no environmental protection equipment is needed, and the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal heat treatment and quenching, and in particular relates to a fast air cooling and quenching device for heat treatment of small and thin-walled workpieces. Background Art

[0002] At present, high-temperature, small, and thin-walled workpieces are generally placed in oil (quenching oil, diesel) or aqueous solution medium (PAG) for rapid cooling. However, oil quenching has the following problems: (1) When oil quenching is used, a large amount of oil smoke will be generated, polluting the production environment, and environmental protection equipment must be installed; (2) Oil quenching is also prone to sparks and fires, posing a safety hazard; (3) When oil quenching, it is easy to deform and the organizational structure is unstable in terms of product quality; when water quenching is used, the speed is fast, but the stress is large, which can easily cause deformation and cracking of the workpiece.

[0003] Through experiments, it is found that the shape and metallographic structure of the product by air cooling quenching are more stable, but the cooling effect is not good if the small and thin-walled workpieces are directly cooled by natural air, which can easily lead to insufficient hardness of the metal parts after quenching. Therefore, a fast air cooling quenching device for heat treatment of small and thin-walled workpieces is needed to achieve a sufficient quenching speed by air cooling quenching. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a fast air cooling quenching device for heat treatment of small and thin-walled workpieces, which can quickly cool high-temperature metal parts, stabilize product quality, and reduce quenching distortion and quenching cracking tendency.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a rapid air-cooling quenching device for heat treatment of small and thin-walled workpieces, including a workpiece conveying mechanism, an air-cooling mechanism and a refrigeration unit. The high-temperature workpiece is placed on the workpiece conveying mechanism, the air outlet of the refrigeration unit is connected to the air inlet of the air-cooling mechanism, and the air outlet of the air-cooling mechanism is arranged toward the workpiece conveying mechanism.

[0006] Preferably, the refrigeration unit is an atomizing cooling unit, which includes a water tank, a water circulation pump, an atomizing device and an axial flow fan. The water circulation pump is respectively connected to the water tank and the atomizing device. The axial flow fan is arranged on one side of the atomizing device, and the air outlet of the axial flow fan is connected to the air inlet of the air cooling mechanism.

[0007] Preferably, the refrigeration unit is a chilled water heat exchanger unit, which includes a water tank, a water circulation pump, a chilled water device and a heat exchanger. The water inlet of the water circulation pump is connected to the water tank, the water outlet of the water circulation pump is connected to the chilled water device, the chilled water device is connected to the water inlet of the heat exchanger, the water outlet of the heat exchanger is connected to the water tank, an axial flow fan is provided at the air inlet of the heat exchanger, and the air outlet of the heat exchanger is connected to the air inlet of the air cooling mechanism.

[0008] Preferably, the heat exchanger is a plurality of groups of shell and tube heat exchangers.

[0009] Preferably, the refrigeration unit is an industrial refrigeration unit, which includes a compressor, a condenser and an evaporator arranged in sequence, a fan is provided at the air inlet of the evaporator, and the air outlet of the evaporator is connected to the air inlet of the air cooling mechanism.

[0010] Preferably, a humidity detection device is provided on the connecting pipeline between the refrigeration unit and the air cooling mechanism.

[0011] Preferably, the air cooling mechanism comprises an air amplifier unit, which is fixed on a fixed bracket, which is mounted on the workpiece conveying mechanism, and external compressed air is introduced into the air amplifier unit.

[0012] Preferably, an electromagnetic shutoff valve and a flow regulating valve are provided on the pipeline through which the air amplifier unit is introduced into the external compressed air.

[0013] Preferably, the workpiece conveying mechanism comprises a frame and a transmission chain unit, the transmission chain unit is arranged on the frame, and the transmission chain unit is connected to a driving member.

[0014] Preferably, a plurality of U-shaped frames or V-shaped frames with openings facing upward are evenly distributed on the transmission chain unit.

[0015] Compared with the prior art, the above technical solution has the following beneficial effects:

[0016] 1. The utility model adds a refrigeration unit, which cools the outside air and blows it to the high-temperature workpiece to cool it down. The cooling effect is good, which avoids the problem of insufficient hardness of metal parts after quenching and cooling. The shape and metallographic structure of the air-cooled quenched product are more stable. The utility model uses air cooling to quickly cool the high-temperature workpiece, without oil medium, reducing safety hazards, reducing environmental pollution, and does not need to install environmental protection equipment, thereby reducing production costs.

[0017] 2. The utility model allows the high-temperature workpiece to pass compressed air through each group of air amplifier units, while absorbing 5 to 10 times the outside air, and performs high-speed blowing on the surface of the high-temperature workpiece to achieve rapid air-cooling quenching. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of embodiment 1.

[0019] Figure 2 It is a structural diagram of embodiment 2.

[0020] Figure 3 This is a schematic diagram of the structure of the third embodiment.

[0021] Among them: 1. workpiece conveying mechanism 2. air cooling mechanism 3. cooling air 4. transmission chain unit 5. high-temperature workpiece 6. atomizing cooling unit 7. chilled water heat exchange unit 8. heat exchanger 9. axial flow fan 10. industrial refrigeration unit 11. hygrometer 12. electromagnetic shut-off valve 13. air amplifier unit 14. flow regulating valve 15. water circulation pump 16. outside air 17. compressed air 18. water tank 19. chilled water equipment 20. evaporator 21. fan 22. external unit. DETAILED DESCRIPTION

[0022] Figures 1 to 3 It is the best embodiment of the utility model, and the following Figures 1 to 3 The utility model is further described.

[0023] Embodiment 1

[0024] like Figure 1 As shown, a fast air-cooling quenching device for heat treatment of small and thin-walled workpieces of the utility model comprises a workpiece conveying mechanism 1, an air-cooling mechanism 2 and a refrigeration unit. A high-temperature workpiece 5 is placed on the workpiece conveying mechanism 1. The quenching time is controlled by controlling the conveying speed of the workpiece conveying mechanism 1. The air-cooling mechanism 2 is arranged directly above the workpiece conveying mechanism 1. External air 16 is introduced into the refrigeration unit. The air outlet of the refrigeration unit is connected to the air-cooling mechanism 2. The external air 16 is cooled by the refrigeration unit. The cooled air enters the air-cooling mechanism 2. The air outlet of the air-cooling mechanism 2 is directly opposite to the high-temperature workpiece 5 on the workpiece conveying mechanism 1. The low-temperature air is blown to the high-temperature workpiece 5 by the air-cooling mechanism 2 to cool it down. The cooling effect is good, and the problem of insufficient hardness of metal parts after quenching and cooling is avoided. The shape and metallographic structure of the product by air-cooling quenching are more stable and can be maintained in a better secondary state. The small and thin-walled workpiece mentioned in this embodiment is not specifically limited, and refers to a workpiece with a diameter not exceeding 2 cm and a thickness not exceeding 5 mm.

[0025] The workpiece conveying mechanism 1 includes a frame and a transmission chain unit 4, which is arranged on the frame. The transmission chain unit 4 is connected to a driving member. In this embodiment, the driving member of the transmission chain unit 4 is a frequency converter-controlled reduction motor, which drives the chain or sprocket to rotate. In this embodiment, a number of U-shaped frames or V-shaped frames with openings facing upward are evenly distributed on the transmission chain unit 4. The high-temperature workpiece 5 is placed in the opening groove of the U-shaped frame or the V-shaped frame, which can effectively ensure that the high-temperature workpiece 5 does not move on the chain. The top ends of the openings of the U-shaped frame or the V-shaped frame are rounded, which effectively prevents the U-shaped frame or the V-shaped frame from damaging the surface of the workpiece and affecting the quality of the workpiece.

[0026] The air cooling mechanism 2 includes an air amplifier unit 13, which includes a plurality of groups of air amplifiers arranged side by side at intervals. The air amplifier unit 13 is fixed on a fixed bracket, and the fixed bracket is installed on the workpiece conveying mechanism 1. The air amplifier unit 13 is connected to an external compressed air 17. The compressed air passes through each group of air amplifiers and absorbs 5 to 10 times the outside air at the same time, and blows the surface of the high-temperature workpiece 5 at a high speed, which greatly increases the cooling effect and finally achieves the effect of rapid cooling of the high-temperature workpiece 5. The air amplifier unit 13 can be connected to a compressed gas tank through a pipeline, and the compressed gas tank provides external compressed gas 17. The electromagnetic shut-off valve 12 and the flow regulating valve 14 are arranged on the pipeline of the air amplifier unit 13 for the external compressed air 17. The electromagnetic shut-off valve 12 is installed to facilitate the rapid shut-off of the compressed air 17, and the flow regulating valve 14 is installed to facilitate fine adjustment to ensure the jet pressure and flow rate of each group of air amplifier units 13, and to ensure the air transmission speed to different high-temperature workpieces 5. The air amplifier unit 13 is also provided with a hygrometer 11 on the pipeline of the external compressed air 17 to monitor the humidity of the compressed air 17 in real time. The workpiece conveying mechanism 1 and the air cooling mechanism 2 in this embodiment can refer to the Chinese utility model patent with application number 202222371876.X.

[0027] Due to the different high-temperature metal parts involved, such as battery panels, automobile stabilizer bars, etc., the selected air sources (air temperature, air humidity, air quality) are different, so the refrigeration unit is adjustable to meet the different requirements of different workpieces for rapid cooling during air-cooled quenching.

[0028] In this embodiment, the refrigeration unit is an atomizing cooling unit 6, which includes a water tank 18, a water circulation pump 15, an atomizing device and an axial flow fan 9. The water inlet of the water circulation pump 15 is connected to the water tank 18, and the water outlet of the water circulation pump 15 is connected to the atomizing device. The water circulation pump 15 continuously draws water from the water tank 18. The axial flow fan 9 is arranged on one side of the atomizing device, and is evenly sprayed on the evaporative filter layer through the water replenishment and water distribution system of the atomizing device, so that the outside air 16 enters the evaporative cooling medium and fully exchanges heat with the water. After the water absorbs the heat of the outside air 16, the axial flow fan 9 delivers cool, clean and moist air into each group of air amplifier units 13.

[0029] A humidity detection device is provided on the connecting pipeline between the refrigeration unit and each group of air amplifier units 13. In this embodiment, the humidity detection device is a hygrometer 11, which monitors the air humidity in real time.

[0030] When the utility model is in use, the high-temperature workpiece 5 is placed in the open groove of the U-shaped frame or the V-shaped frame, and the transmission chain unit 4 drives the high-temperature workpiece 5 to complete uniform movement. At the same time, the water circulation pump 15 continuously draws water from the water tank 18 and transports it to the atomization device. The outside air 16 enters the evaporation device and fully exchanges heat with the water. After the water absorbs the heat of the outside air 16, the axial flow fan 9 sends cool, clean and moist air into each group of air amplifier units 13. When the high-temperature workpiece 5 is transported to the bottom of each group of air amplifier units 13, the compressed gas quickly cools the high-temperature workpiece 5 to achieve air-cooled quenching. Subsequently, the cooled workpiece continues to move with the transmission chain unit 2 and is then collected by the operator. The utility model changes the traditional quenching method of the high-temperature workpiece 5, and adopts air cooling to quickly cool the high-temperature workpiece 5. It does not contain oil media, reduces safety hazards, reduces environmental pollution, does not need to install environmental protection equipment, and reduces production costs. The addition of a refrigeration mechanism has a good cooling effect, avoids the problem of insufficient hardness of the high-temperature workpiece 5 after quenching and cooling. The shape and metallographic structure of the air-cooled quenched product are more stable and can be maintained in a good secondary state.

[0031] Embodiment 2

[0032] like Figure 2 As shown, the refrigeration unit in this embodiment is a chilled water heat exchange unit 7, which includes a water tank 18, a water circulation pump 15, a chilled water device 19 and a heat exchanger 8. The water inlet of the water circulation pump 15 is connected to the water tank 18, and the water outlet of the water circulation pump 15 is connected to the chilled water device 19. The chilled water device 19 converts the water delivered by the water circulation pump 15 into chilled water. The chilled water device 19 is connected to the water inlet of the heat exchanger 8. An axial flow fan 9 is provided at the air inlet of the heat exchanger 8. The axial flow fan 9 blows the outside air 16 to the heat exchanger 8, and heat exchange is performed in the heat exchanger 8. The air outlet of the heat exchanger 8 is connected to the air inlet of each group of air amplifier units 13, and low-temperature air is sent into each group of air amplifier units 13 to perform high-speed blowing on the surface of the high-temperature workpiece 5 to achieve rapid air-cooling quenching. The water outlet of the heat exchanger 8 is connected to the water tank 18, and the water in the heat exchanger 8 eventually returns to the water tank 18.

[0033] The heat exchanger 8 in this embodiment is a plurality of groups of shell and tube heat exchangers. The shell and tube heat exchanger has a simple structure, low cost, wide flow cross-section, and is easy to clean scale. It can be made of various structural materials (mainly metal materials) and can be used under high temperature and high pressure.

[0034] Embodiment 3

[0035] like Figure 3As shown, the refrigeration unit in this embodiment is an industrial refrigeration unit 10, which includes a compressor, a condenser and an evaporator 20 arranged in sequence. The industrial refrigeration unit 10 in this embodiment is the same as the air conditioning refrigeration principle. The compressor and the condenser are the outdoor unit 22, and the evaporator 20 is equivalent to the indoor unit. The low-pressure steam of the refrigerant is sucked in by the compressor and compressed into high-pressure steam and then discharged to the condenser. A fan is also provided on one side of the outdoor unit 22. The outside air sucked in by the fan flows through the condenser, takes away the heat released by the refrigerant, and makes the high-pressure refrigerant vapor The steam condenses into high-pressure liquid, which is sprayed into the evaporator 20 and evaporates at a corresponding low pressure, absorbing the surrounding heat. A fan 21 is provided at the air inlet of the evaporator 20, and the fan 21 blows the outside air 16 to the evaporator 20. The outside air 16 continuously enters the fins of the evaporator 20 for heat exchange. The air outlet of the evaporator 20 is connected with the air inlet of each group of air amplifier units 13, and finally the air that becomes cold after heat release is sent to each group of air amplifier units 13, so as to blow the surface of the high-temperature workpiece 5 at high speed and realize rapid air-cooling quenching.

[0036] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A rapid air cooling quenching device for heat treatment of small and thin-walled workpieces, characterized in that: It comprises a workpiece conveying mechanism (1), an air cooling mechanism (2) and a refrigeration unit, wherein a high-temperature workpiece (5) is placed on the workpiece conveying mechanism (1), outside air (16) is introduced into the refrigeration unit, an air outlet of the refrigeration unit is connected to an air inlet of the air cooling mechanism (2), and an air outlet of the air cooling mechanism (2) is arranged toward the workpiece conveying mechanism (1); The refrigeration unit is an atomizing cooling unit (6), which comprises a water tank (18), a water circulation pump (15), an atomizing device and an axial flow fan (9), wherein the water circulation pump (15) is connected to the water tank (18) and the atomizing device respectively, and the axial flow fan (9) is arranged on one side of the atomizing device, and the air outlet of the axial flow fan (9) is connected to the air inlet of the air cooling mechanism (2).

2. The rapid air cooling quenching device for heat treatment of small and thin-walled workpieces according to claim 1 is characterized in that: A humidity detection device is provided on the connecting pipeline between the refrigeration unit and the air cooling mechanism (2).

3. The rapid air cooling quenching device for heat treatment of small and thin-walled workpieces according to claim 1 is characterized in that: The air cooling mechanism (2) comprises an air amplifier unit (13), the air amplifier unit (13) being fixed on a fixed bracket, the fixed bracket being mounted on the workpiece conveying mechanism (1), and external compressed air (17) being introduced into the air amplifier unit (13).

4. The rapid air cooling quenching device for heat treatment of small and thin-walled workpieces according to claim 3 is characterized by: An electromagnetic shutoff valve (12) and a flow regulating valve (14) are provided on a pipeline through which the air amplifier unit (13) is fed with external compressed air (17).

5. The rapid air cooling quenching device for heat treatment of small and thin-walled workpieces according to claim 1 is characterized in that: The workpiece conveying mechanism (1) comprises a frame and a transmission chain unit (4); the transmission chain unit (4) is arranged on the frame, and the transmission chain unit (4) is connected to a driving member.

6. A rapid air cooling quenching device for heat treatment of small and thin-walled workpieces according to claim 5, characterized in that: A plurality of U-shaped frames or V-shaped frames with openings facing upwards are evenly distributed on the transmission chain unit (4).

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