A punching mechanism for processing aviation rivets

Abstract

A kind of punching mechanism for aviation rivet processing, it is related to rivet processing field, including punching assembly and forming assembly, forming assembly includes transmission track and forming groove unit, the bottom of transmission track is provided with track support, forming groove unit includes the forming groove being set on transmission track, the inner wall of forming groove is provided with electromagnetic heating coil, punching assembly is set on the top of transmission track, punching assembly includes punching rod and hydraulic rod, the top of punching rod is connected with the power shaft of hydraulic rod, the bottom of hydraulic rod is connected with track support, rivet cap raw material is placed in forming groove in the present application, rivet cap raw material in forming groove is sent to punching assembly to carry out integrated punching forming by transmission track, the production efficiency of rivet cap is improved, rivet cap raw material in forming groove is heated by electromagnetic heating coil in punching process, to eliminate internal stress of metal, reduce punching resistance in punching process, and prevent metal fatigue, guarantee the quality of rivet cap.

Description

TECHNICAL FIELD

[0001] The present application relates to rivet processing technical field, especially to a punching mechanism for aviation rivet processing. BACKGROUND

[0002] Aviation rivet processing is a key technology in aircraft manufacturing, mainly used for connecting structure components such as fuselage skin and frame, and needs to meet the strict requirements of high strength, lightweight and corrosion resistance. Rivet materials are mostly aluminum alloy, titanium alloy or high-strength stainless steel, and the rivet shaft and head are shaped by cold upsetting or hot processing technology to ensure structural consistency. The size accuracy and surface finish need to be strictly controlled during processing to avoid stress concentration. Surface treatment often uses plating, anodic oxidation or spray corrosion-resistant coating to cope with extreme temperature and humidity changes in high-altitude environment. Quality detection is particularly important, and internal defects need to be checked by non-destructive means such as X-ray flaw detection and ultrasonic testing, and tensile and shear strength tests are conducted according to aviation standards. With the increasing application of composite materials, rivet design tends to be shaped and miniaturized, and processing technology is also upgraded to automatic riveting equipment and intelligent process monitoring to improve assembly efficiency and reduce human error, meeting the extreme pursuit of reliability and safety of modern aviation equipment.

[0003] With the current development of high-precision direction of aircraft fuselage manufacturing. Some sheet metal parts on the aircraft require high-precision rivet elements, therefore, the punching processing of the rivet cap is a severe challenge. Currently, most of the rivet cap punching equipment on the market uses cold upsetting punching technology, but this technology directly punches the metal at room temperature, which can easily cause internal cracks due to metal fatigue, affecting the quality of the rivet cap. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0005] To achieve the above-mentioned purpose, the present application provides a punching mechanism for aviation rivet processing, which comprises a punching assembly and a forming assembly, wherein the punching assembly is used for punching and forming the raw metal in the forming assembly, the forming assembly comprises a transmission track and a forming groove unit, the bottom of the transmission track is provided with a track support, the forming groove unit comprises a forming groove provided on the transmission track, the inner wall of the forming groove is provided with an electromagnetic heating coil, the punching assembly is arranged above the transmission track, and the punching assembly comprises a punching rod and a hydraulic rod, wherein the top of the punching rod is connected with the power shaft of the hydraulic rod, and the bottom of the hydraulic rod is connected with the track support.

[0006] Further, a plurality of forming grooves are arranged at equal intervals, the inner wall surface of the forming groove is provided with an inner lining, the inner lining is made of alloy tool steel material, and a graphite heating seat is arranged between the electromagnetic heating coil and the inner lining.

[0007] Further, the lower part of the punching rod is provided with a directional electric heating unit, which comprises a positioning push rod and a power supply unit, wherein the positioning push rod is arranged on the track support and vertically below the punching rod, and the power supply unit is electrically connected with the positioning push rod and the punching rod respectively.

[0008] Further, the power supply unit comprises a first brush and a second brush, wherein the first brush is in sliding contact with the punching rod, and the second brush is in electrical contact with the positioning push rod.

[0009] Further, the top of the positioning push rod is provided with a thimble, the bottom of the positioning push rod is provided with an air cylinder, the outer wall of the thimble is provided with an insulating sleeve, and the side of the thimble in contact with the second brush is provided with a thimble brush.

[0010] Further, the power shaft of the hydraulic rod is provided with a punching support, the bottom end of the punching rod is a pointed end, the top of the punching rod is provided with an impact unit, the impact unit is arranged on the punching support, the impact unit is used to provide reciprocating impact force to the punching rod, the impact unit comprises an impact seat, an electromagnet and an impact plate, wherein the impact seat is arranged on the punching support, the electromagnet is slidingly arranged inside the impact seat, the top of the electromagnet is provided with a compression spring, the impact plate is arranged at the bottom of the impact seat, the impact plate has magnetism, the punching rod slidingly penetrates the bottom of the impact seat, the impact plate is connected with the top of the punching rod, the bottom of the impact plate is provided with a return spring, and the side opposite to the impact plate of the electromagnet is provided with an electrical contact seat.

[0011] Further, the top of the forming groove is provided with a flange groove, a flange pressure plate adapted to the flange groove is slidingly arranged on the punching rod, the two sides of the flange pressure plate are provided with sliding seats, the sliding seats are sleeved on the hydraulic rod, sliding seat springs are arranged between the sliding seats and the hydraulic rod, and positioning units are arranged on the transmission track and the bottom of the forming groove, and the positioning units are used for accurate positioning during the forming groove and the punching process.

[0012] Further, the transmission track is provided with a feeding assembly and a discharging assembly, the feeding assembly comprises a feeding track, a turning seat and a pushing rod, wherein the feeding track is arranged at the feeding end of the turning seat, the discharging end of the turning seat is provided with a discharging nozzle, the discharging nozzle corresponds to the forming groove, the pushing rod is arranged vertically above the discharging nozzle, the power shaft of the pushing rod is provided with a pushing block, the discharging assembly comprises a blowing pump and an ejection cylinder, wherein the blowing pump is arranged on one side of the transmission track, the side of the transmission track away from the blowing pump is provided with a discharging track, the ejection cylinder is arranged at the bottom of the discharging support, and the ejection cylinder corresponds to the bottom of the forming groove.

[0013] Further, a transmission driving unit for driving the transmission track to rotate is arranged on the track support, the transmission driving unit comprising a driving motor and a driving gear plate, wherein the driving motor is arranged on the track support, a driving gear is arranged on a power shaft of the driving motor, the driving gear plate is arranged on the inner side of the transmission track, and the driving gear and the driving gear plate are in mesh with each other.

[0014] Beneficial effects: the rivet cap raw material is placed in the forming groove, the rivet cap raw material in the forming groove is sent to the punching assembly for integrated punching forming through the transmission track, the production efficiency of the rivet cap is improved, the rivet cap raw material in the forming groove is heated through the electromagnetic heating coil in the punching process, so as to eliminate the internal stress of the metal, reduce the punching resistance in the punching process, prevent metal fatigue, and ensure the quality of the rivet cap.

[0015] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0017] Figure 1 It is an overall structure schematic diagram of the punching mechanism for processing aviation rivets according to one embodiment of the present application;

[0018] Figure 2 It is a partial structure schematic diagram of the punching mechanism for processing aviation rivets according to one embodiment of the present application;

[0019] Figure 3 It is a top view of the punching mechanism for processing aviation rivets according to one embodiment of the present application;

[0020] Figure 4 It is a structure schematic diagram of another perspective of the punching mechanism for processing aviation rivets according to one embodiment of the present application;

[0021] Figure 5 It is a sectional view of the impact unit in the punching mechanism for processing aviation rivets according to one embodiment of the present application;

[0022] Figure 6 It is a sectional view of the directional electric heating unit in the punching mechanism for processing aviation rivets according to one embodiment of the present application;

[0023] Figure 7 It is a sectional view of the feeding assembly in the impact unit in the punching mechanism for processing aviation rivets according to one embodiment of the present application;

[0024] Figure 8 Fig. 4 is a sectional view of a forming assembly of a piercing mechanism for processing an aviation rivet according to an embodiment of the present application;

[0025] Figure 9 Fig. 5 is a schematic view of a piercing mechanism for processing an aviation rivet according to an embodiment of the present application at a middle stage of piercing;

[0026] Figure 10 Fig. 6 is a schematic view of a piercing mechanism for processing an aviation rivet according to an embodiment of the present application at a complete piercing stage.

[0027] As shown in the figure: 1, feeding assembly; 11, feeding track; 12, turning seat; 13, discharging nozzle; 14, pushing rod; 141, pushing block; 2, piercing assembly; 21, impact unit; 211, impact seat; 212, extrusion spring; 213, electromagnet; 214, impact plate; 215, return spring; 216, power receiving seat; 22, piercing rod; 221, flange pressure disc; 222, sliding seat; 223, sliding seat spring; 23, hydraulic rod; 231, piercing support; 24, power supply unit; 241, first brush; 242, second brush; 3, discharging assembly; 31, blowing pump; 32, discharging track; 33, discharging support; 34, ejecting cylinder; 4, forming assembly; 41, transmission track; 42, track support; 43, forming groove unit; 431, flange groove; 432, electromagnetic heating coil; 433, graphite heating seat; 434, inner lining; 435, sliding sleeve; 436, positioning unit; 437, forming groove; 44, transmission driving unit; 441, driving gear; 442, driving toothed disc; 443, driving motor; 45, directional electric heating unit; 451, positioning push rod; 452, air cylinder; 453, ejector pin; 454, insulating outer sleeve; 455, ejector pin brush; 5, mounting seat; 6, rivet cap product. DETAILED DESCRIPTION

[0028] Embodiments of the present application are described in detail below with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0029] A piercing mechanism for processing an aviation rivet according to an embodiment of the present application is described below in conjunction with the accompanying drawings.

[0030] As Figures 2-4 shown, the piercing mechanism for processing an aviation rivet according to an embodiment of the present application includes a piercing assembly 2 and a forming assembly 4, wherein the piercing assembly 2 is used to pierce and form the raw metal in the forming assembly 4.

[0031] The forming assembly 4 comprises a transmission track 41 and a forming groove unit 43, wherein the bottom of the transmission track 41 is provided with a track support 42, the bottom of the track support 42 is provided with a mounting seat 5, the forming groove unit 43 comprises a forming groove 437 arranged on the transmission track 41, and the inner wall of the forming groove 437 is provided with an electromagnetic heating coil 432.

[0032] The punching assembly 2 is arranged above the transmission track 41, and the punching assembly 2 comprises a punching rod 22 and a hydraulic rod 23, wherein the top of the punching rod 22 is connected with the power shaft of the hydraulic rod 23, and the bottom of the hydraulic rod 23 is connected with the track support 42.

[0033] Specifically, when the rivet cap is processed, first, the rivet cap raw material (the rivet cap raw material can be a segment-shaped metal block, and the size thereof can be completely placed on the bottom of the forming groove 437) is placed in the forming groove 437, and the electromagnetic heating coil 432 in the forming groove 437 is turned on to perform electromagnetic heating on the rivet cap raw material, so as to eliminate the internal stress of the metal, reduce the punching resistance in the punching process, and prevent metal fatigue.

[0034] The transmission track 41 moves on the track support 42 to drive the forming groove 437 to move below the punching assembly 2, and then the transmission track 41 stops moving. Then the hydraulic rod 23 drives the punching rod 22 to move downward, and then drives the punching rod 22 to extrude the rivet cap raw material in the forming groove 437, and vertically extrude a hole in the middle part of the rivet cap raw material. The outer wall of the rivet cap raw material is filled with the inner wall of the forming groove 437, the punching rod 22 is filled with the hole wall of the rivet cap raw material, so that the rivet cap raw material is integrally pressure cast in the forming groove 437, and the production efficiency of the rivet cap is improved.

[0035] And the rivet cap raw material is in a heated state during the punching process, the internal stress of the metal is low, the punching resistance in the punching process is effectively reduced, and metal fatigue is prevented, so as to ensure the quality of the rivet cap.

[0036] In an embodiment of the present application, as shown in Figure 2 and Figure 8 The forming groove 437 is arranged at equal intervals, the inner wall surface of the forming groove 437 is provided with an inner lining 434, the inner lining 434 is made of alloy tool steel material and has high hardness, the electromagnetic heating coil 432 and the inner lining 434 are provided with a graphite heating seat 433.

[0037] Specifically, in order to heat the outer wall of the rivet cap, make the outer wall of the rivet cap smoothly fit the inner wall of the forming groove 437, the graphite heating seat 433 is arranged between the electromagnetic heating coil 432 and the inner lining 434, the electromagnetic heating coil 432 generates eddy current in the conductive graphite heating seat 433, the temperature of the graphite heating seat 433 is raised, and then acts on the inner wall of the forming groove 437 to heat the outer wall of the rivet cap, so that the outer wall of the rivet cap is heated to reduce the hardness and is smoothly fitted with the inner wall of the forming groove 437.

[0038] In one embodiment of the present application, as shown in Figure 5 、 Figure 6 and Figure 8 , the lower part of the punching rod 22 is provided with a directional electric heating unit 45, which includes a positioning push rod 451 and a power supply unit 24, wherein the positioning push rod 451 is arranged on the track support 42 and vertically below the punching rod 22, the bottom of the forming groove 437 is provided with a sliding sleeve 435 matched with the positioning push rod 451, and the power supply unit 24 is electrically connected with the positioning push rod 451 and the punching rod 22 respectively.

[0039] Specifically, in order to accelerate the punching speed of the rivet cap, as shown in Figure 9 , during the punching process, the power supply unit 24 applies strong current between the punching rod 22 and the positioning push rod 451, the metal between the punching rod 22 and the positioning push rod 451 is heated by electricity and the temperature is sharply raised, and the metal contacting the bottom of the punching rod 22 has the highest temperature, so that during the process of the punching rod 22 extruding the metal downward, the metal contacted by the punching rod 22 is softened due to the electric heating, which is more conducive to the punching speed of the rivet cap.

[0040] In one embodiment of the present application, as shown in Figure 5 and Figure 6 , the power supply unit 24 includes a first brush 241 and a second brush 242, wherein the first brush 241 is in sliding contact with the punching rod 22, and the second brush 242 is in electrical contact with the positioning push rod 451.

[0041] Specifically, during the punching process, the first brush 241 is in sliding contact with the punching rod 22, so that the power supply is always connected during the up-and-down movement of the punching rod 22; similarly, the second brush 242 is in electrical contact with the positioning push rod 451, so that the power supply is always connected to ensure the stability of the power supply.

[0042] In one embodiment of the present application, as shown in Figure 6 , the top of the positioning push rod 451 is provided with a thimble 453, the bottom of the positioning push rod 451 is provided with an air cylinder 452, the outer wall of the thimble 453 is provided with an insulating sleeve 454, and the side of the thimble 453 in contact with the second brush 242 is provided with a thimble brush 455.

[0043] Specifically, in the process of punching, in order to enable the bottom of the rivet cap to be fixed and stable and in electrical contact with the positioning push rod 451, the air cylinder 452 drives the positioning push rod 451 to press the bottom end of the rivet cap upward, and the thimble 453 at the top of the positioning push rod 451 penetrates into the bottom of the rivet cap, so that the bottom of the rivet cap can be fixed and stable and in electrical contact with the positioning push rod 451.

[0044] When the punching is completed, as shown in Figure 10 , the punching rod 22 presses the positioning push rod 451 to move downward, so that the rivet cap is completely punched.

[0045] In an embodiment of the present application, as shown in Figure 2 and Figure 5 , the power shaft of the hydraulic rod 23 is provided with a punching support 231, the bottom end of the punching rod 22 is a pointed end, the top of the punching rod 22 is provided with an impact unit 21, the impact unit 21 is arranged on the punching support 231, and the impact unit 21 is used to provide reciprocating impact force to the punching rod 22.

[0046] The impact unit 21 comprises an impact seat 211, an electromagnet 213 and an impact plate 214, wherein the impact seat 211 is arranged on the punching support 231, the electromagnet 213 is slidingly arranged in the impact seat 211, and the top of the electromagnet 213 is provided with a pressing spring 212.

[0047] The impact plate 214 is arranged at the bottom of the impact seat 211, the impact plate 214 has magnetism, the punching rod 22 slidingly penetrates through the bottom of the impact seat 211, and the impact plate 214 is connected with the top of the punching rod 22, the bottom of the impact plate 214 is provided with a reset spring 215, so that the punching rod 22 can move up and down during the impact process, and the opposite sides of the electromagnet 213 and the impact plate 214 are both provided with an electrical contact seat 216.

[0048] Specifically, in order to enable the rivet cap to be quickly perforated during the punching process, the electrical contact seat 216 on the impact plate 214 is connected with a power source, when the electrical contact seat 216 at the bottom of the electromagnet 213 contacts with the electrical contact seat 216 on the impact plate 214, the electromagnet 213 is electrified to generate the same magnetic pole as the impact plate 214, the electromagnet 213 is pushed upward by the magnetic force and is bounced away, the electromagnet 213 is pressed by the pressing spring during the upward movement, the electromagnet 213 is de-energized and the magnetic force disappears, the electromagnet 213 continues to move downward to hit the impact plate 214 after moving to the highest point, and continues to bounce upward, so as to provide reciprocating impact force to the impact plate 214, and the punching rod 22 can quickly punch the rivet cap up and down.

[0049] In an embodiment of the present application, as shown in Figure 8As shown, the top of the forming groove 437 is provided with a flange groove 431, the punching rod 22 is slidingly provided with a flange disc 221 matched with the flange groove 431, and the two sides of the flange disc 221 are provided with sliding seats 222 which are sleeved on the hydraulic rod 23, and the sliding seats 222 are provided with sliding seat springs 223 between the sliding seats 222 and the hydraulic rod 23.

[0050] Specifically, in order to form a flange effect on the top of the rivet cap, after the hydraulic rod 23 is compressed to the bottom end, as shown in Figure 10 As shown, the punching support 231 at the top of the hydraulic rod 23 extrudes the flange disc 221 into the flange groove 431, so that the rivet cap raw material at the top of the forming groove 437 is pressed into the flange shape of the rivet cap.

[0051] In addition, after the rivet cap punching is completed, the flange disc 221 is supported by the sliding seat spring 223 in the sliding seat 222 to leave the flange groove 431, and when the sliding seat 222 reaches the top of the forming groove 437, it is limited to stop, at this time, the hydraulic rod 23 can continue to drive the punching rod 22 to move upwards, thereby facilitating the punching rod 22 to separate from the inside of the rivet cap.

[0052] In an embodiment of the present application, as shown in Figure 8 As shown, the bottom of the forming groove 437 and the transmission track 41 are both provided with positioning units 436, which are used for accurate positioning of the forming groove 437 during the punching process, and the positioning units 436 can be positioning magnets or in-place inductors, so that the forming groove 437 is accurately positioned after reaching below the feeding assembly 1, below the punching rod 22 and below the discharging assembly 3.

[0053] In an embodiment of the present application, as shown in Figure 2 and Figure 7 As shown, the transmission track 41 is provided with a feeding assembly 1 and a discharging assembly 3, the feeding assembly 1 includes a feeding track 11, a turning seat 12 and a pushing rod 14, wherein the feeding track 11 is arranged at the feeding end of the turning seat 12, the discharging end of the turning seat 12 is provided with a discharging nozzle 13 which corresponds to the forming groove 437, and the pushing rod 14 is arranged vertically above the discharging nozzle 13, and the power shaft of the pushing rod 14 is provided with a pushing block 141.

[0054] The discharging assembly 3 includes a blowing pump 31 and an ejection cylinder 34, wherein the blowing pump 31 is arranged on one side of the transmission track 41, the side of the transmission track 41 away from the blowing pump 31 is provided with a discharging track 32, the bottom of the discharging track 32 is provided with a discharging support 33, and the ejection cylinder 34 is arranged at the bottom of the discharging support 33, and the ejection cylinder 34 corresponds to the bottom of the forming groove 437.

[0055] Specifically, in the process of sending rivet cap raw materials into the forming groove 437, the rivet cap raw materials are fed from the feeding track 11 and are sent into the turning seat 12, at this time, the push block 141 at the bottom of the push rod 14 extrudes the rivet cap raw materials downward to the discharge nozzle 13 and is sent into the forming groove 437 from the discharge nozzle 13.

[0056] When the rivet cap punching is completed, the hydraulic rod 23 drives the punching rod 22 to move upward away from the forming groove 437, and at the same time, the cylinder 452 drives the positioning push rod 451 to move downward away from the bottom of the forming groove 437, the forming groove 437 continues to rotate and moves, when it moves to the upper side of the ejection cylinder 34, the ejection cylinder 34 ejects the formed rivet cap product 6 upward, and the blowing pump 31 blows the rivet cap onto the discharge support 33.

[0057] In an embodiment of the present application, as shown in Figure 2 and Figure 3 , the track support 42 is provided with a transmission driving unit 44 for driving the transmission track 41 to rotate, the transmission driving unit 44 includes a driving motor 443 and a driving gear disc 442, wherein the driving motor 443 is arranged on the track support 42, a driving gear 441 is arranged on the power shaft of the driving motor 443, the driving gear disc 442 is arranged on the inner side of the transmission track 41, and the driving gear 441 and the driving gear disc 442 are meshed with each other.

[0058] Specifically, in the process of rotating the transmission track 41, the driving motor 443 drives the driving gear 441 to rotate, the driving gear 441 is meshed with the driving gear disc 442 on the inner side of the transmission track 41, and then drives the transmission track 41 to rotate on the track support 42.

[0059] In order to clearly illustrate the above-mentioned embodiments, refer to Figures 1-10 , the working principle of the punching mechanism for processing aviation rivets of the present application is as follows: the punching mechanism is first installed on the rivet cap processing equipment through the mounting seat 5, and in the rivet cap processing procedure, the starting step is the feeding link. The segment-shaped metal block meeting the size requirements (i.e. can completely fall on the bottom of the forming groove 437) is accurately fed from the feeding track 11. After the rivet cap raw material smoothly enters the turning seat 12, the push rod 14 extrudes the rivet cap raw material vertically downward by means of the push block 141 at the bottom, until it reaches the discharge nozzle 13, and then the rivet cap raw material is sent into the inside of the forming groove 437 from the discharge nozzle 13.

[0060] Then the electromagnetic heating coil 432 arranged around the inside of the forming groove 437 starts to work, and the released heat uniformly acts on the outer wall of the rivet cap. As the temperature rises, the hardness of the outer wall of the rivet cap gradually decreases, so that in the subsequent extrusion process, it can perfectly fit the inner wall of the forming groove 437, laying a foundation for the preliminary forming of the rivet cap.

[0061] When the rivet cap is initially heated, the transmission track 41 is driven by the driving motor 443 to rotate smoothly on the track support 42. Until the forming groove 437 accurately reaches the position directly below the punching rod 22, the transmission track 41 stops rotating, preparing for the punching process. At this time, the hydraulic rod 23 quickly responds to move the punching rod 22 downward to punch the rivet cap raw material in the forming groove 437.

[0062] During the punching process of the punching rod 22, the power contact 216 on the impact plate 214 is connected to the power supply. When the power contact 216 at the bottom of the electromagnet 213 contacts the power contact 216 on the impact plate 214, the electromagnet 213 is instantly powered on, generating the same magnetic pole as the impact plate 214. Under the action of strong magnetic force, the electromagnet 213 quickly pops up, and the compression spring is strongly compressed in this process. At the same time, the electromagnet 213 pops up and is powered off, and the electromagnetic force disappears immediately. After moving upward to the highest point, it continues to fall downward under the action of gravity and repeatedly hits the impact plate 214. This continues to provide reciprocating impact force to the impact plate 214, and also enables the punching rod 22 to achieve high-frequency rapid punching action.

[0063] During the punching process, the power supply unit 24 plays a key role in applying high-strength current between the punching rod 22 and the positioning push rod 451. The punching rod 22 is thereby heated by electrically heating the upper end of the rivet cap raw material, and at the same time, the cylinder 452 pushes the positioning push rod 451 to accurately press the bottom of the rivet cap upward. The sharp needle 453 at the top of the positioning push rod 451 pierces into the bottom of the rivet cap, achieving stable fixation of the bottom of the rivet cap. Moreover, the positioning push rod 451 also electrically heats the bottom of the rivet cap raw material, forming a strong current loop at the punching position of the metal center line, thereby efficiently heating the metal at this position.

[0064] Under this design, the metal between the punching rod 22 and the positioning push rod 451 has a sharp temperature rise due to electric heating. The metal in direct contact with the bottom of the punching rod 22 has the highest temperature. Therefore, during the process of the punching rod 22 pressing the metal downward, the hardness of this part of the metal is greatly reduced due to electric heating, greatly reducing the difficulty of punching, and more conducive to the rapid and accurate penetration of the punching rod 22 through the metal at the center of the rivet cap.

[0065] When the punching operation of the rivet cap is completed, as shown in Figure 10 , the punching rod 22 does not stop moving, but continues to apply pressure to push the positioning push rod 451 to move further downward, ensuring that the rivet cap is completely punched. Then, the punching support 231 at the top of the hydraulic rod 23 quickly exerts force to press the flange disc 221, so that it smoothly enters the flange groove 431. In this process, the rivet cap raw material at the top of the forming groove 437 is accurately pressed into the flange shape required by the rivet cap.

[0066] After the punching and flange forming process of the rivet cap is successfully completed, the flange pressure plate 221 is slowly separated from the flange groove 431 under the strong supporting force of the sliding seat spring 223 in the sliding seat 222. After the sliding seat 222 smoothly reaches above the forming groove 437, the limiting device in the sliding seat 222 is started to stop the movement. At this time, the hydraulic rod 23 can continue to drive the punching rod 22 to move upward, thereby assisting the punching rod 22 to conveniently separate from the inside of the rivet cap.

[0067] After all the processing procedures of the rivet cap are completed, the hydraulic rod 23 drives the punching rod 22 to completely move upward and away from the forming groove 437. At the same time, the positioning push rod 451 driven by the air cylinder 452 moves downward and separates from the bottom of the forming groove 437. Then, the forming groove 437 continues to rotate and move under the drive of the mechanical device. When it moves to the top of the ejecting cylinder 34, the ejecting cylinder 34 instantly exerts force to stably eject the formed rivet cap product 6 upward. Finally, the material blowing pump 31 is opened to work, and the rivet cap is blown to the discharging support 33, and thus the whole process of rivet cap processing is completed.

[0068] In summary, the punching mechanism for processing the rivet cap of the embodiment of the application places the rivet cap raw material in the forming groove, and sends the rivet cap raw material in the forming groove to the punching assembly for integrated punching and forming through the transmission track, thereby improving the production efficiency of the rivet cap. The rivet cap raw material in the forming groove is heated by the electromagnetic heating coil during the punching process to eliminate internal stress of the metal, reduce punching resistance during the punching process, prevent metal fatigue, and ensure the quality of the rivet cap.

[0069] Although the embodiments of the application have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limiting the application. Those skilled in the art can make changes, modifications, replacements and deformations to the above-described embodiments within the scope of the application.

Claims

1. A punching mechanism for processing aircraft rivets, characterized in that, Including punch assembly (2) and forming assembly (4), wherein the punch assembly (2) is used for punching forming of raw material metal in the forming assembly (4); The forming assembly (4) includes a transmission track (41) and a forming groove unit (43), wherein the bottom of the transmission track (41) is provided with a track support (42), and the forming groove unit (43) includes a forming groove (437) arranged on the transmission track (41), and the inner wall of the forming groove (437) is provided with an electromagnetic heating coil (432); The punch assembly (2) is arranged above the transmission track (41), and the punch assembly (2) includes a punch rod (22) and a hydraulic rod (23), wherein the top of the punch rod (22) is connected with the power shaft of the hydraulic rod (23), and the bottom of the hydraulic rod (23) is connected with the track support (42); The forming groove (437) is arranged at equal intervals, the inner wall surface of the forming groove (437) is provided with an inner lining (434), the inner lining (434) is made of alloy tool steel material, and a graphite heating seat (433) is arranged between the electromagnetic heating coil (432) and the inner lining (434); A directional electric heating unit (45) is arranged below the punch rod (22), the directional electric heating unit (45) includes a positioning push rod (451) and a power supply unit (24), wherein the positioning push rod (451) is arranged on the track support (42), and the positioning push rod (451) is vertically below the punch rod (22), and the power supply unit (24) is electrically connected with the positioning push rod (451) and the punch rod (22) respectively; The power supply unit (24) includes a first electric brush (241) and a second electric brush (242), wherein the first electric brush (241) is in sliding contact with the punch rod (22), and the second electric brush (242) is in electric contact with the positioning push rod (451); The top of the positioning push rod (451) is provided with a thimble (453), the bottom of the positioning push rod (451) is provided with an air cylinder (452), the outer wall of the thimble (453) is provided with an insulating sleeve (454), and one side of the thimble (453) in contact with the second electric brush (242) is provided with a thimble electric brush (455).

2. The piercing mechanism for processing the aviation rivet according to claim 1, wherein A punch support (231) is arranged on the power shaft of the hydraulic rod (23), the bottom end of the punch rod (22) is a pointed end, the top of the punch rod (22) is provided with an impact unit (21), the impact unit (21) is arranged on the punch support (231), and the impact unit (21) is used for providing reciprocating impact force to the punch rod (22); The impact unit (21) includes an impact seat (211), an electromagnet (213) and an impact plate (214), wherein the impact seat (211) is arranged on the punch support (231), the electromagnet (213) is slidably arranged in the impact seat (211), and the top of the electromagnet (213) is provided with an extrusion compression spring (212). The impact plate (214) is arranged at the bottom of the impact seat (211), the impact plate (214) has magnetism, the punching rod (22) is slidably penetrated through the bottom of the impact seat (211), and the impact plate (214) is connected with the top of the punching rod (22), the bottom of the impact plate (214) is provided with a reset spring (215), and the opposite sides of the electromagnet (213) and the impact plate (214) are provided with power receiving seats (216).

3. The piercing mechanism for processing the aviation rivet according to claim 1, wherein The top of the forming groove (437) is provided with a flange groove (431), the punching rod (22) is slidably provided with a flange pressing disc (221) matched with the flange groove (431), the two sides of the flange pressing disc (221) are provided with sliding seats (222), the sliding seats (222) are sleeved on the hydraulic rods (23), and sliding seat springs (223) are arranged between the sliding seats (222) and the hydraulic rods (23). The bottom of the forming groove (437) and the transmission track (41) are provided with positioning units (436), and the positioning units (436) are used for accurate positioning during the punching process.

4. The piercing mechanism for processing the aviation rivet according to claim 1, wherein The transmission track (41) is provided with a feeding assembly (1) and a discharging assembly (3). The feeding assembly (1) comprises a feeding track (11), a turning seat (12) and a pushing rod (14), the feeding track (11) is arranged at the feeding end of the turning seat (12), the discharging end of the turning seat (12) is provided with a discharging nozzle (13), the discharging nozzle (13) is matched with the forming groove (437), the pushing rod (14) is arranged vertically above the discharging nozzle (13), and a pushing block (141) is arranged on the power shaft of the pushing rod (14). The discharging assembly (3) comprises a blowing pump (31) and an ejection electric cylinder (34), the blowing pump (31) is arranged on one side of the transmission track (41), the side, away from the blowing pump (31), of the transmission track (41) is provided with a discharging track (32), the ejection electric cylinder (34) is arranged at the bottom of a discharging support (33), and the ejection electric cylinder (34) is matched with the bottom of the forming groove (437).

5. The piercing mechanism for processing the aviation rivet according to claim 1, wherein The track support (42) is provided with a transmission driving unit (44) for driving the transmission track (41) to rotate, the transmission driving unit (44) comprises a driving motor (443) and a driving gear plate (442), the driving motor (443) is arranged on the track support (42), a driving gear (441) is arranged on the power shaft of the driving motor (443), the driving gear plate (442) is arranged on the inner side of the transmission track (41), and the driving gear (441) and the driving gear plate (442) are matched with each other.

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