Production line for continuous production of sofa iron stand

Abstract

The invention relates to a production line for continuous production of sofa iron stands, which comprises an upper wheel die holder, a lower wheel die holder is clamped at the bottom end of the upper wheel die holder, a driving shaft is fixedly connected to the inner ends of the upper wheel die holder and the lower wheel die holder, and a workpiece is arranged at the outer end of the upper wheel die holder in a contact manner. The top end of the bending arm is in sliding connection with a hydraulic sliding block, the top end of the hydraulic sliding block is in sliding connection with a servo sliding block, the resilience force of a bent workpiece can be monitored through the detection device, accurate bending compensation is conducted, the resilience phenomenon of the workpiece caused by material characteristics is effectively compensated, and the size precision of a finished product is improved; according to the bending compensation device, the product quality and consistency are guaranteed, the stress relieving assembly conducts induction heating on the bent portion of the workpiece during bending compensation, internal stress is eliminated, secondary springback is prevented, meanwhile, the possibility that the workpiece deforms in the follow-up use process is reduced, the durability and reliability of the product are enhanced, and the overall performance of the product is improved.

Description

Technical Field

[0001] The invention relates to a production line for continuous production of sofa iron frames, in particular to a production line for continuous production of sofa iron frames applied in the field of sofa brackets. Background Art

[0002] In the modern furniture manufacturing industry, the production and processing of sofa iron frames is one of the key links, especially on the sofa production line, where pipe bending equipment is used to bend metal pipes into the required shape to make the sofa frame.

[0003] Chinese invention patent CN118650045A discloses a pipe bending processing technology field. During the pipe bending operation, the guide die presses one end of the pipe while moving with the pipe, and cooperates with the anti-wrinkle block to complete the anti-wrinkle and anti-scratch work of the pipe, thereby improving the quality of the pipe bending process, and the high degree of automation improves the processing efficiency of the pipe bending. Although the present invention solves the problem of anti-wrinkle and anti-scratch on the surface of the pipe, it cannot guarantee the consistency of the product.

[0004] Chinese invention patent CN112958668B discloses a device for detecting the rebound position of a bent pipe. The invention can change the stress point of the bent pipe and detect the rebound position. Although the invention detects the rebound position, the detection accuracy is low and the rebound amount is not compensated.

[0005] To this end, we use this technical solution to solve the problems of low rebound detection accuracy, inability to perform rebound compensation, and poor product consistency of existing pipe bending equipment. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a production line for the continuous production of sofa iron frames, detect the rebound force through a detection device, calculate the compensation amount based on the rebound force data and material properties, and perform precise rebound compensation through a bending device, while eliminating stress and preventing secondary rebound.

[0007] In order to solve the above problems, the present invention provides a production line for continuous production of sofa iron frames, comprising an upper wheel die base, the bottom end of the upper wheel die base is clamped with a lower wheel die base, the inner ends of the upper wheel die base and the lower wheel die base are fixedly connected with a driving shaft, and the outer end of the upper wheel die base is in contact with a workpiece, characterized in that the outer end of the driving shaft is fixedly connected with a bending arm, the top end of the bending arm is slidably connected with a hydraulic slider, the top end of the hydraulic slider is slidably connected with a servo slider, the top end of the servo slider is fixedly connected with a tightening die, a through hole is provided inside the tightening die, a force-conducting sheet is embedded in the clamping mouth of the tightening die, and the inner side of the force-conducting sheet is in contact with the workpiece, the outer side of the force-conducting sheet is fixedly connected with a piezoelectric ceramic stack, and the piezoelectric The outer end of the ceramic stack is fixedly connected to a lubrication and heat dissipation sleeve, and the bottom end of the lubrication and heat dissipation sleeve is fixedly connected to a separation ring, and the separation ring divides the lubrication and heat dissipation sleeve into a heat absorption cavity and a lubrication cavity, the heat absorption cavity is filled with heat absorption expansion liquid, and the lubrication cavity is filled with lubricating oil, the inner wall of the lubrication and heat dissipation sleeve is slidably connected to an expansion ring, a lubrication port is provided at the outer end of the bottom of the lubrication and heat dissipation sleeve, and a sealing ring is slidably connected to the inner wall of the bottom of the lubrication and heat dissipation sleeve, and the bottom end of the sealing ring is contacted with an elastic ring, and the inner end of the elastic ring is fixedly connected to a rubber diaphragm, the top end of the piezoelectric ceramic stack is fixedly connected to a push rod, the outer end of the push rod is fixedly connected to a filter assembly, and the outer end of the clamping mold is fixedly connected to a stress relief assembly.

[0008] As a further improvement of the present application, as a further improvement of the present application, an oil guide channel is opened inside the push rod, the bottom of the oil guide channel is connected to the lubrication cavity in the lubrication and heat dissipation sleeve through an oil guide pipe, the oil guide pipe is slidably connected to the separator ring, and the end of the push rod is fixedly connected to the hydraulic slider through a fixed block.

[0009] As another improvement of the present application, the filter assembly includes a first baffle fixedly connected to the outer end of the push rod, the outer end of the first baffle is fixedly connected to a plurality of multi-fold air bags, the outer end of the push rod is slidably connected to a second baffle, and the second baffle is slidably connected to the push rod, the inner wall of the through hole is fixedly connected to a clamping plate, and the inner end of the clamping plate is in contact with the second baffle, and filter cotton is filled between the first baffle and the second baffle.

[0010] As another improved supplement of the present application, the stress relief assembly includes a notch-shaped corrugated strip fixedly connected to the outer end of the clamping die, the notch-shaped corrugated strip has an external induction heating coil embedded therein, the outer end of the external induction heating coil is slidably connected to a pressure die, a plurality of tension springs are fixedly connected to the bottom of the notch-shaped corrugated strip, and one end of the plurality of tension springs away from the notch-shaped corrugated strip is fixedly connected to the inner wall of the pressure die, and the inner wall of the pressure die is arranged in contact with the workpiece.

[0011] As another improvement supplement to the present application, the outer end of the pressure mold is fixedly connected to a hydraulic cylinder, the outer end of the hydraulic cylinder is fixedly connected to a slider, the bottom end of the slider is slidably connected to a frame, the top end of the frame is fixedly connected to an anti-folding mold, and the inner end of the anti-folding mold is arranged in contact with the workpiece.

[0012] As another improvement of the present application, the inner end of the upper wheel mold base is fixedly connected with an internal induction heating coil, and the lower half of the internal induction heating coil is fixedly connected to the lower wheel mold base, and the bottom end of the drive shaft is fixedly connected with a power device.

[0013] As another improvement of the present application, the piezoelectric ceramic stack is composed of multiple layers of piezoelectric ceramic sheets stacked in series, the piezoelectric ceramic stack is electrically connected to the control system through a wire, and a lubrication groove is provided at a position of the through hole corresponding to the lubrication and heat dissipation sleeve.

[0014] In summary, this application has the following beneficial effects:

[0015] 1. Springback compensation: The piezoelectric ceramic stack can monitor the rebound force of the workpiece after bending in real time and transmit the data back to the control system. The control system calculates the compensation amount based on the rebound force data and material properties, and drives the clamping die to perform precise bending compensation through the servo slider, which effectively compensates for the rebound phenomenon caused by the material properties of the workpiece, improves the dimensional accuracy of the finished product, and ensures the quality and consistency of the product.

[0016] 2. Stress relief: The stress relief component includes a notched corrugated strip and an external induction heating coil. During bending compensation, the bending part of the workpiece is induction heated to eliminate internal stress and prevent secondary springback. At the same time, it also reduces the possibility of deformation of the workpiece in subsequent use, enhances the durability and reliability of the product, and improves the overall performance of the product.

[0017] 3. Automatic lubrication: The lubrication and heat dissipation sleeve is provided with a heat absorption cavity and a lubrication cavity inside. The heat absorption expansion fluid absorbs heat and pushes the expansion ring to move, pushing the lubricating oil to the lubrication port. The lubricating oil flows out through the lubrication port and acts between the clamping die and the lubrication and heat dissipation sleeve, realizing automatic lubrication, ensuring the lubrication effect between the clamping die and the lubrication and heat dissipation sleeve, ensuring normal measurement and reducing maintenance costs.

[0018] 4. Active heat dissipation: The heat-absorbing expansion fluid is filled in the heat-absorbing cavity, which can absorb the heat generated by the piezoelectric ceramic stack. After expansion, it pushes the expansion ring to move, assists automatic lubrication, effectively absorbs heat, and prevents the high temperature of the piezoelectric ceramic stack from affecting the measurement accuracy.

[0019] 5. Lubricating oil recycling; the filter assembly includes a first baffle, a multi-fold airbag, a second baffle, a clamping plate and filter cotton, which can filter impurities in the lubricating oil for the first time. The filtered lubricating oil is deposited in the lubrication groove and is used to lubricate the servo slider, thereby realizing the recycling of the lubricating oil, saving resources, reducing production costs, and ensuring the cleanliness of the lubricating oil, avoiding equipment wear and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the first partial view of this application;

[0021] Figure 2 This is an enlarged view of point A of this application;

[0022] Figure 3 This is the second partial view of this application;

[0023] Figure 4 This is the third partial view of this application;

[0024] Figure 5 This is the fourth partial view of this application;

[0025] Figure 6 This is the fifth partial view of the present application;

[0026] Figure 7 This is the front view of the application;

[0027] Figure 8 For this application Figure 7 BB cross-sectional view;

[0028] Fig. 9 For this application Figure 8 CC section view;

[0029] Fig.10 For this application Figure 8 The enlarged view of point D;

[0030] Fig.11 This is the overall structure diagram of this application.

[0031] Description of the numbers in the figure:

[0032] 1. Upper wheel die base; 2. Lower wheel die base; 3. Drive shaft; 4. Workpiece; 5. Bending arm; 6. Hydraulic slider; 7. Servo slider; 8. Clamping die; 9. Through hole; 10. Force-conducting sheet; 11. Piezoelectric ceramic stack; 12. Lubricating and cooling sleeve; 1201. Separating ring; 1202. Heat-absorbing expansion liquid; 1203. Lubricating oil; 1204. Expansion ring; 13. Lubrication port; 14. Sealing ring; 15. Elastic ring; 1501. Rubber diaphragm; 16. Ejector rod ; 1601, oil guide channel; 17, filter assembly; 1701, first baffle; 1702, multi-fold airbag; 1703, second baffle; 1704, clamping plate; 1705, filter press cotton; 18, stress relief assembly; 1801, notched corrugated strip; 1802, external induction heating coil; 1803, pressure mold; 1804, tension spring; 19, frame; 20, anti-fold mold; 21, internal induction heating coil; 22, power unit; 23, lubrication groove. DETAILED DESCRIPTION

[0033] Three implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0034] The first implementation method:

[0035] Figure 1-Figure 11 Shows:

[0036] The bending arm 5 realizes the clamping of the workpiece 4, and cooperates with the upper wheel die base 1 and the lower wheel die base 2 to complete the bending. The hydraulic slider 6 is used to complete the lateral displacement of the top clamping die 8 and the servo slider 7. The servo slider 7 is used to drive the top clamping die 8 to move and assist in completing the rebound force detection. A through hole 9 is opened inside the top clamping die 8, and a force-conducting sheet 10 is embedded in the bayonet. A piezoelectric ceramic stack 11 is fixedly connected to the top. The top clamping die 8 ensures that the ends of the workpiece 4 are evenly stressed during the bending process and protects the surface of the workpiece 4 from damage. The force-conducting sheet 10 is embedded in the bayonet of the top clamping die 8 to prevent the piezoelectric ceramic stack 11 from being rubbed and affecting the measurement accuracy. After the bending is completed, the rebound force of the workpiece 4 can be detected and the signal is transmitted to the control system to realize intelligent compensation, which effectively improves the dimensional accuracy of the finished product. The heat-absorbing expansion liquid 1202 can absorb the piezoelectric ceramic stack 11 Heat, after expansion, pushes the expansion ring 1204 to move, and pushes the lubricating oil 1203 to the lubrication port 13, so as to realize automatic lubrication and heat dissipation, extend the equipment life, and reduce the maintenance cost. The separation ring 1201 divides the lubrication and heat dissipation sleeve 12 into a heat absorption cavity and a lubrication cavity, so as to ensure the independent operation of the heat absorption cavity and the lubrication cavity, avoid the mixing of the two liquids, and improve the stability and reliability of the system. The heat absorption expansion liquid 1202 is filled in the heat absorption cavity, which can absorb heat and expand. The expansion ring 1204 can push the lubricating oil 1203 to move to the lubrication port 13, so as to realize automatic lubrication and heat dissipation. The lubrication port 13 is provided at the bottom of the lubrication and heat dissipation sleeve 12, and the lubricating oil 1203 flows out through the lubrication port 13 for lubrication, so as to ensure that the lubricating oil 1203 can be evenly distributed between the top mold 8 and the lubrication and heat dissipation sleeve 12, so as to provide a continuous lubrication effect.

[0037] After the temperature drops, the elastic ring 15 can push the sealing ring 14 upward to close the lubrication port 13 to prevent excessive waste of the lubricating oil 1203. The rubber diaphragm 1501 can expand and contract when the temperature changes to reset the elastic ring 15. The end of the push rod 16 is fixedly connected to the hydraulic slider 6 through a fixed block, so that the piezoelectric ceramic stack 11 and the hydraulic slider 6 move synchronously. The filter component 17 can effectively filter impurities in the used lubricating oil 1203 to ensure the cleanliness of the lubricating oil 1203 and avoid equipment wear. At the same time, it can realize the recycling of the lubricating oil 1203 and save resources. The stress relief component 18 can perform induction heating treatment on the workpiece 4 after bending is completed to eliminate internal stress and prevent the workpiece 4 from rebounding again after rebound compensation.

[0038] The second implementation method:

[0039] Figure 1-Figure 11 Shows:

[0040] The bottom of the oil guide channel 1601 is connected to the lubrication cavity in the lubrication and heat dissipation sleeve 12 through an oil guide pipe, the oil guide pipe is slidably connected to the separation ring 1201, and the end of the push rod 16 is fixedly connected to the hydraulic slider 6 through a fixed block. When the lubrication cavity is short of oil, the outside world can inject lubricating oil 1203 through the oil guide channel 1601 and the oil guide pipe. The first baffle 1701 is fixedly connected to the outer end of the push rod 16, and a plurality of multi-fold air bags 1702 are fixedly connected to the outer end. The first baffle 1701 plays a role of extrusion support. The multi-fold air bags 1702 can shrink and expand when the top mold 8 moves, so that the second baffle 1703 is reset. The second baffle 1703 cooperates with the first baffle 1701 to complete the extrusion filtration of the lubricating oil 1203. The pressing plate 1704 provides the pressing force, and the filter cotton 1705 is effectively passed. Impurities in the lubricating oil 1203 are filtered out to ensure that the lubricating oil 1203 can be reused. The notched corrugated strip 1801 is fixedly connected to the outer end of the stress relief component 18, and an external induction heating coil 1802 is embedded in it, providing a uniform heating area to ensure that the internal stress of the workpiece 4 is effectively eliminated. The tension spring 1804 cooperates with the notched corrugated strip 1801 to complete the reset. The anti-wrinkle mold 20 is fixedly connected to the top of the frame 19, and the inner end is in contact with the workpiece 4 to prevent the workpiece 4 from wrinkling during the bending process. The internal induction heating coil 21 cooperates with the external induction heating coil 1802 to complete the induction heating of the workpiece 4. The lubrication groove 23 collects and stores the filtered lubricating oil 1203 to ensure the lubrication effect between the clamping mold 8 and the lubrication and heat dissipation sleeve 12 and reduce the waste of the lubricating oil 1203.

[0041] The third implementation method:

[0042] Figure 1-Figure 11 Shows:

[0043] The working principle of this scheme is as follows: when the sofa iron frame needs to be bent, the feeding mechanism feeds the workpiece 4 into the anti-folding die 20, the control system drives the hydraulic cylinder to drive the pressure die 1803 to press the workpiece 4, and at the same time the power device 22 drives the bending arm 5 back to the initial position, and at the same time drives the hydraulic slide 6 to drive the pressing die 8 to move, and the pressing die 8 cooperates with the upper wheel die base 1 and the lower wheel die base 2 to clamp. After the clamping is completed, the control system controls the power device 22 to drive the driving shaft 3 to rotate according to the preset bending angle, and the driving shaft 3 drives The upper wheel die base 1, the lower wheel die base 2 and the clamping die 8 rotate together to bend the workpiece 4. At the same time, the stress relief assembly 18 fixedly connected to the clamping die 8 will also be brought out together. The notched corrugated strip 1801 slides outward along the pressure die 1803, and the notched corrugated strip 1801 fits with the workpiece 4. The tension spring 1804 is in a stretched state. When the rotation angle reaches a preset value, the rotation stops, and the servo slider 7 is controlled to drive the clamping die 8 to move away from the workpiece 4 until the clamping die 8 is in a non-contact state with the workpiece 4. In this state, the hydraulic slider 6 remains stationary. At this time, the rebound force of the workpiece 4 will fully act on the piezoelectric ceramic stack 11. The piezoelectric ceramic stack 11 transmits the detected rebound force data back to the control system. The control system combines the rebound force and calculates the compensation amount according to the material properties and the bending process parameters. At the same time, the servo slider 7 drives the clamping die 8 back to the initial position to contact the workpiece 4. According to the compensation amount, the system continues to drive the power device 22 to drive the upper wheel die base 1, the lower wheel die base 2 and the clamping die 8 to rotate a certain angle together for bending compensation. After reaching the position, it stops rotating, controls the external induction heating coil 1802 and the internal induction heating coil 21 to be energized, and performs induction heating on the bending part of the workpiece 4 to eliminate the stress caused by the bending. After the stress is eliminated, the hydraulic slider 6 is controlled to drive the bending arm 5 back to the initial bending position. At the same time, the servo slider 7 drives the clamping die 8 to move away from the workpiece 4 again until the clamping die 8 and the workpiece 4 are in a non-contact state. The piezoelectric ceramic stack 11 detects the rebound force again. When the rebound force is zero, the die is withdrawn and the material is unloaded to complete the bending.

[0044] When performing the resilience test, the heat generated by the piezoelectric ceramic stack 11 will be absorbed by the heat absorbing expansion fluid 1202 in the heat absorbing cavity. After the heat absorbing expansion fluid 1202 expands, it pushes the expansion ring 1204 to move. The movement of the expansion ring 1204 pushes the lubricating oil 1203 in the lubricating cavity to move toward the bottom of the lubricating heat dissipation sleeve 12. The pressurized lubricating oil 1203 pushes the sealing ring 14 to move. The sealing ring 14 presses the elastic ring 15. The elastic ring 15 contracts. When the sealing ring 14 moves to the position of the lubrication port 13, the lubricating oil 1203 flows out through the lubrication port 13 and acts on the through hole 9. The top mold 8 and the lubricating heat dissipation sleeve 12 are automatically lubricated. At the same time, the lubricating oil 1203 will also take away some heat to assist in heat dissipation. When the temperature drops, the pressure of thermal expansion is less than the elastic force of the elastic ring 15, and the rubber diaphragm 1501 in the elastic ring 15 rebounds, so that the elastic ring 15 pushes the sealing ring 14 upward, closes the lubrication port 13, and prevents excessive waste of lubricating oil 1203. When the lubricating oil level in the lubricating cavity in 12 decreases, the distance between the expansion ring 1204 and the top of 12 decreases, and the sensor at the top of 12 detects that the expansion ring 1204 and 12 When the distance to the top exceeds the set value, the control system controls the external oil pump to replenish the lubricating oil through the oil guide channel 1601 until the expansion ring 1204 returns to the initial position and stops replenishing. When the top clamping mold 8 moves outward along the outer wall of the lubricating and cooling sleeve 12, the lubricating oil 1203 on the through hole 9 will be absorbed by the filter component 17 to prevent the lubricating oil 1203 with dust and impurities from entering the gap between the top clamping mold 8 and the lubricating and cooling sleeve 12 again. The lubricating oil 1203 absorbed by the filter component 17 can be used again after filtering. When the top clamping mold 8 moves outward, the lubricating oil brought out The lubricating oil 1203 is absorbed and filtered by the filter cotton 1705. When the clamping die 8 returns, it drives 174 to squeeze the second baffle 1703, shortens the distance between the first baffle 1701 and the clamping plate 1704, and squeezes out the filtered lubricating oil 1203. At the same time, the multi-fold airbag 1702 contracts. When the clamping die 8 moves outward again, the multi-fold airbag 1702 expands and pushes open the second baffle 1703 to absorb the lubricating oil 1203 again. The squeezed lubricating oil 1203 is deposited in the lubrication groove 23 and is used to lubricate the servo slider 7, thereby achieving the purpose of secondary utilization.

[0045] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A production line for continuous production of sofa iron frames, characterized by: The invention comprises an upper wheel die base (1), the bottom end of the upper wheel die base (1) is clamped with a lower wheel die base (2), the inner ends of the upper wheel die base (1) and the lower wheel die base (2) are fixedly connected with a drive shaft (3), the outer end of the upper wheel die base (1) is contacted with a workpiece (4), and the outer end of the lower wheel die base (2) is contacted with the workpiece (4), and the characteristic is that the outer end of the drive shaft (3) is fixedly connected with a bending arm (5), the top end of the bending arm (5) is slidably connected with a hydraulic slide block (6), and the hydraulic slide block The top of the workpiece (6) is slidably connected to a servo slider (7), the top of the servo slider (7) is fixedly connected to a clamping die (8), a through hole (9) is provided inside the clamping die (8), a force-conducting sheet (10) is embedded in the bayonet of the clamping die (8), and the end of the force-conducting sheet (10) close to the workpiece (4) is arranged in contact with the workpiece (4), the end of the force-conducting sheet (10) away from the workpiece (4) is fixedly connected to a piezoelectric ceramic stack (11), and the outer end of the piezoelectric ceramic stack (11) is fixedly connected to the workpiece (4). The lubricating heat dissipation sleeve (12) is fixedly connected to the lubricating heat dissipation sleeve (12), the bottom end of the lubricating heat dissipation sleeve (12) is fixedly connected to a separation ring (1201), the separation ring (1201) divides the lubricating heat dissipation sleeve (12) into a heat absorption cavity and a lubricating cavity, the heat absorption cavity is filled with a heat absorption expansion liquid (1202), the lubricating cavity is filled with lubricating oil (1203), the inner wall of the lubricating heat dissipation sleeve (12) is slidably connected to an expansion ring (1204), and the bottom outer end of the lubricating heat dissipation sleeve (12) is provided with a A lubrication port (13) is provided, the bottom inner wall of the lubrication and heat dissipation sleeve (12) is slidably connected to a sealing ring (14), the bottom end of the sealing ring (14) is contacted with an elastic ring (15), the inner end of the elastic ring (15) is fixedly connected to a rubber diaphragm (1501), the top end of the piezoelectric ceramic stack (11) is fixedly connected to a push rod (16), the outer end of the push rod (16) is fixedly connected to a filter assembly (17), and the outer end of the clamping mold (8) is fixedly connected to a stress relief assembly (18).

2. The production line for continuous production of sofa iron frames according to claim 1, characterized in that: An oil guide channel (1601) is provided inside the push rod (16), the bottom of the oil guide channel (1601) is connected to the lubrication cavity in the lubrication and heat dissipation sleeve (12) through an oil guide pipe, the oil guide pipe is slidably connected to the expansion ring (1204), and the end of the push rod (16) is fixedly connected to the hydraulic slider (6) through a fixing block.

3. The production line for continuous production of sofa iron frames according to claim 2, characterized in that: The filter assembly (17) comprises a first baffle (1701) fixedly connected to the outer end of the push rod (16); the outer end of the first baffle (1701) is fixedly connected to a plurality of multi-fold air bags (1702); the outer end of the push rod (16) is slidably connected to a second baffle (1703), and the second baffle (1703) is slidably connected to the push rod (16); the inner wall of the through hole (9) is fixedly connected to a clamping plate (1704), and the inner end of the clamping plate (1704) is arranged in contact with the second baffle (1703); and filter cotton (1705) is filled between the first baffle (1701) and the second baffle (1703).

4. The production line for continuous production of sofa iron frames according to claim 3 is characterized by: The stress relief assembly (18) comprises a notch-shaped corrugated strip (1801) fixedly connected to the outer end of the clamping die (8), the notch-shaped corrugated strip (1801) having an external induction heating coil (1802) embedded therein, the outer end of the external induction heating coil (1802) being slidably connected to a pressure die (1803), a plurality of tension springs (1804) being fixedly connected to the bottom of the notch-shaped corrugated strip (1801), and one end of the plurality of tension springs (1804) away from the notch-shaped corrugated strip (1801) being fixedly connected to the inner wall of the pressure die (1803), and the inner wall of the pressure die (1803) being arranged in contact with the workpiece (4).

5. The production line for continuous production of sofa iron frames according to claim 4, characterized in that: The outer end of the pressure mold (1803) is fixedly connected to a hydraulic cylinder, the outer end of the hydraulic cylinder is fixedly connected to a sliding block, the bottom end of the sliding block is slidably connected to a frame (19), the top end of the frame (19) is fixedly connected to an anti-folding mold (20), and the inner end of the anti-folding mold (20) is arranged in contact with the workpiece (4).

6. A production line for continuous production of sofa iron frames according to claim 1 or 5, characterized in that: The inner end of the upper wheel die base (1) is fixedly connected to an inner induction heating coil (21), and the lower half of the inner induction heating coil (21) is fixedly connected to the lower wheel die base (2), and the bottom end of the driving shaft (3) is fixedly connected to a power device (22).

7. The production line for continuous production of sofa iron frames according to claim 1, characterized in that: The piezoelectric ceramic stack (11) is composed of multiple layers of piezoelectric ceramic sheets stacked in series, the piezoelectric ceramic stack (11) is electrically connected to a control system via a wire, and a lubrication groove (23) is provided at a position of the through hole (9) corresponding to the lubrication and heat dissipation sleeve (12).

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