Intelligent cutting device for automobile expansion sheet and cutting method thereof

Abstract

The application discloses an intelligent cutting device for automobile expansion sheet and a cutting method thereof, and belongs to the field of blanking cutting. The intelligent cutting device for automobile expansion sheet comprises a tool holder, a punching knife unit, a cutter bar driving element and a plurality of adjusting units which are installed on the tool holder. The punching knife unit is installed on the front side of the tool holder and surrounds a circle. The end of the punching knife unit away from the tool holder is a cutting edge, and the end of the punching knife unit close to the tool holder is a cutting back. The cutting edge to the cutting back of the punching knife unit is the cutting direction of the punching knife unit. The punching knife unit can be freely bent in the direction perpendicular to the cutting direction of the punching knife unit. The plurality of adjusting units are installed on the tool holder and can be connected with the punching knife unit. The adjusting unit can bend any position of the punching knife unit for adjusting the path around the punching knife unit. The device can cut more edge strips of automobile expansion sheet on the expansion sheet substrate at the same time, and improves the cutting efficiency of the cutting device for automobile expansion sheet.

Description

Technical Field

[0001] This invention relates to the field of punching and cutting, and more specifically, to an intelligent cutting device and method for automotive expansion plates. Background Technology

[0002] Automotive expansion pads are special expansion pads for automobiles made of synthetic rubber and resin as the base material. They are installed between two adjacent parts of the vehicle body and have high expansion rate, good adhesion, elasticity, sound absorption, vibration reduction and noise reduction effects.

[0003] Stamping equipment is often used in the production of expansion sheets. The stamping equipment drives the cutting tool to punch and cut the expansion sheet substrate, so that the expansion sheet can be formed.

[0004] However, since the shapes of the expansion plates for different parts of a car are different, in order to reduce the number of cutting tools, the existing technology usually uses one cutting tool to cut different edge strips of the expansion plate in sequence. The efficiency of cutting the expansion plate gradually decreases as the number of edge strips of the expansion plate increases. Therefore, the efficiency of the cutting device for cutting the expansion plate is greatly limited. Summary of the Invention

[0005] 1. Technical problems to be solved

[0006] To address the problems existing in the prior art, the present invention aims to provide an intelligent cutting device and method for automotive expansion sheets, which can simultaneously cut multiple edge strips of automotive expansion sheets on the expansion sheet substrate, thereby improving the efficiency of the cutting device in cutting automotive expansion sheets.

[0007] 2. Technical Solution

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] A smart cutting device for automotive expansion plates includes a tool holder and a stamping device, characterized in that: the tool holder is equipped with:

[0010] A punching unit is installed on the front side of the tool holder and arranged in a circle. The end of the punching unit away from the tool holder is the cutting edge, and the end of the punching unit closer to the tool holder is the back of the blade. The cutting direction of the punching unit is from the cutting edge to the back of the blade. The punching unit can be freely bent in a direction perpendicular to the cutting direction of the punching unit.

[0011] Multiple adjustment units are mounted on the tool holder and can be connected to the punch unit. The adjustment units can be bent at any position of the punch unit to adjust the path around which the punch unit is positioned.

[0012] The blade drive unit, mounted on the blade holder, is used to drive the punch unit 2 to move along the path around it.

[0013] Furthermore, it also includes another punch unit, which is mounted on the front side of the tool holder and located outside the first punch unit. The tool holder is also provided with a blade drive and multiple adjustment units connected to the punch unit located outside.

[0014] Furthermore, the punching unit includes an elastic blade connected end to end, with the end of the elastic blade away from the blade holder being the cutting edge and the end of the elastic blade near the blade holder being the blade back.

[0015] Furthermore, the punching unit includes an elastic blade strip, the end of which away from the blade holder is the cutting edge, and the end of which near the blade holder is the blade back. Both ends of the elastic blade strip are connected to the blade strip drive member.

[0016] Furthermore, the adjustment unit includes a first multi-degree-of-freedom robotic arm fixedly connected to the tool holder. The first multi-degree-of-freedom robotic arm is equipped with a blade support. The blade support can abut against the side of the elastic blade near the back of the blade. A blade limiting strip is fixedly connected to the outside of the blade support and at the position of the elastic blade near the tool holder to limit the back of the elastic blade.

[0017] Furthermore, the adjustment unit includes a blade support, a blade limiting bar, a magnet seat, and an electromagnet core column. The magnet seat is installed on the side of the blade holder away from the punching unit, the electromagnet core column is installed on the magnet seat, and the blade support is installed on the side of the blade holder closer to the punching unit. The magnet seat and the blade support are magnetically attracted to each other. When the electromagnet core column is energized, it is magnetically attracted to the blade support, and the magnetic force of the electromagnet core column is greater than the magnetic force of the magnet seat.

[0018] The blade limiting strip is fixedly connected to the blade support, and the blade supports of the multiple adjustment units are respectively located on the inner and outer sides of the elastic blade.

[0019] Furthermore, the blade drive includes a housing, on which two rotating drums are rotatably connected. The two ends of the elastic blade are respectively wound onto the two rotating drums. The housing is also fixedly connected to two drive motors connected to the rotating drums. A connecting rod is installed on the housing and slidably connected to the blade holder. The housing is also equipped with a temperature sensor opposite to the elastic blade.

[0020] Furthermore, an elastic support plate is fitted on the outer side of the blade support. The curvature of the elastic support plate at the point where it abuts the elastic blade is adjustable. A horizontal moving part one is fitted on the blade support. The horizontal moving part one is connected to the middle position of the elastic support plate. Two small turntables are also fitted on the blade support. A horizontal moving part two is fixedly connected to each of the two small turntables. A connecting ring is fitted on each of the two horizontal moving parts two. Inner rails are fixedly connected to both sides of the elastic support plate near the blade support and at the connection point between the elastic support plate and the horizontal moving part one. The connecting ring is slidably connected to the inner rails.

[0021] A smart cutting method for automotive expansion plates includes the following steps:

[0022] S1: Adjust the path around which the punch unit is positioned by activating the adjustment unit until the inner edge of the punch unit overlaps with the inner edge of the automotive expansion plate.

[0023] S2: The stamping equipment drives the tool holder and the punch unit to move vertically, so that the punch unit moves to the expansion plate substrate. The tool bar drive is activated to drive the punch unit to move along the path around it, and the inner edge of the automotive expansion plate is stamped and cut into shape.

[0024] S3: Adjust the path around which the punch unit is positioned by activating the adjustment unit until the outer edge of the punch unit overlaps with that of the automotive expansion plate;

[0025] S4: The stamping equipment drives the tool holder and punch unit to move vertically, allowing the punch unit to move onto the expansion plate substrate. The tool bar drive is activated to drive the punch unit to move along its surrounding path, stamping and cutting the outer edge of the automotive expansion plate into shape.

[0026] 3. Beneficial effects

[0027] Compared with the prior art, the advantages of this invention are:

[0028] 1. This solution adjusts the path of the punch unit by setting an adjustment unit, and adjusts it to the corresponding shape according to the different shapes of the automotive expansion pieces, thus completing the cutting of automotive expansion pieces and improving the efficiency of the cutting device in cutting automotive expansion pieces. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure in Embodiment 1 of the present invention;

[0030] Figure 2 This is a top view of the structure in Embodiment 1 of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure in Embodiment 2 of the present invention;

[0032] Figure 4This is a top view of the structure in Embodiment 2 of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure in Embodiment 5 of the present invention;

[0034] Figure 6 This is a schematic diagram of the structure in Embodiment Six of the present invention;

[0035] Figure 7 This is a partial three-dimensional structural diagram of the blade limiting strip of the present invention;

[0036] Figure 8 This is a top view schematic diagram of the elastic support sheet of the present invention;

[0037] Figure 9 This is a schematic diagram of the blade drive component of the present invention.

[0038] Explanation of the labels in the diagram:

[0039] 1. Tool holder; 2. Punch unit; 3. Adjustment unit; 4. Elastic tool bar; 5. Tool bar drive component; 6. First multi-degree-of-freedom robotic arm; 7. Tool bar support; 8. Tool limiting bar; 9. Magnet seat; 10. Electromagnet core column; 11. Second multi-degree-of-freedom robotic arm; 12. Horizontal moving component one; 13. Elastic support plate; 14. Small turntable; 15. Horizontal moving component two; 16. Inner rail; 17. Connecting ring; 18. Housing; 19. Rotary cylinder; 20. Connecting rod; 21. Temperature sensor. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] Example 1

[0042] Please see Figure 1 - Figure 2 A smart cutting device for automotive expansion plates includes a tool holder 1 and a stamping device, wherein the tool holder 1 is equipped with:

[0043] The punch unit 2 is installed on the front side of the knife holder 1 and surrounds it. The end of the punch unit 2 away from the knife holder 1 is the blade, and the end of the punch unit 2 close to the knife holder 1 is the back of the blade. The cutting direction of the punch unit 2 is from the blade to the back of the blade. The punch unit 2 cannot be easily bent along its cutting direction and has high hardness. The punch unit 2 can be bent freely in a direction perpendicular to the cutting direction of the punch unit 2.

[0044] Multiple adjustment units 3 are mounted on the tool holder 1 and can be connected to the punch unit 2. The adjustment units 3 can bend the punch unit 2 at any position to adjust the path around which the punch unit 2 is surrounded, so that the punch unit 2 can be freely surrounded into different shapes according to the user's needs.

[0045] The blade drive 5 is mounted on the blade holder 1 and is used to drive the punch unit 2 to move along the path it surrounds, so that the blade of the punch unit 2 generates shearing force during the movement, thereby improving the cutting performance of the blade of the punch unit 2.

[0046] For example, when the car expansion plate is square, the four corners of the punch unit 2 are supported by the four adjustment units 3, so that the punch unit 2 forms the corresponding square to complete the cutting.

[0047] When the car expansion plate is irregularly shaped, multiple adjustment units 3 support multiple corners of the punch unit 2, allowing the punch unit 2 to form the corresponding shape and complete the cutting.

[0048] In use, the user can operate the adjustment unit 3 according to the shape of the car expansion piece, so that the adjustment unit 3 bends the punch unit 2, adjusts the path around the punch unit 2, so that the punch unit 2 and the edge of the car expansion piece overlap, and then punches and cuts the expansion piece substrate through the punch unit 2. During the cutting process, the punch unit 2 is driven by the blade drive 5 to move along its surrounding path, so that the car expansion piece can be punched and cut on the expansion piece substrate.

[0049] In summary, this technical solution, by setting the adjustment unit 3 to adjust the path of the punch unit 2, can simultaneously cut a large number of edge strips of the automotive expansion sheet on the expansion sheet substrate, thereby improving the efficiency of the cutting device in cutting the automotive expansion sheet. Furthermore, since it is formed in one cut, it is not necessary to cut the corner of the automotive expansion sheet twice, and the cutting continuity at the corner is better. Both the punch unit 2 and the adjustment unit 3 can be directly controlled by the host, which has a good intelligent control effect.

[0050] Example 2

[0051] like Figure 1 - Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that the intelligent cutting device also includes another punch unit 2. The punch unit 2 is also installed on the front side of the knife holder 1 and located outside the first punch unit 2. The knife holder 1 is also provided with a blade drive 5 connected to the punch unit 2 located on the outside and multiple adjustment units 3. At this time, the two punch units 2 are adjusted by the adjustment units 3 so that the two punch units 2 can punch and cut the inner edge and outer edge of the automobile expansion piece respectively, so that the punching and cutting can be formed in one go, further improving the punching and cutting efficiency.

[0052] Example 3

[0053] like Figure 1 - Figure 2 As shown, this embodiment discloses a structure of the punching unit 2 based on embodiment 1. The punching unit 2 includes an elastic blade 4 connected end to end. The end of the elastic blade 4 away from the blade holder 1 is the blade edge, and the end of the elastic blade 4 near the blade holder 1 is the blade back. The elastic blade 4 can be adjusted by the adjusting unit 3.

[0054] Here, the blade drive 5 is a transmission motor, which is mounted on the blade holder 1 via a robotic arm. The robotic arm can adjust the position of the transmission motor. The output end of the transmission motor is fixedly connected to a meshing gear. A meshing groove is provided on the upper part of the side wall of the elastic blade 4. The meshing gear and the meshing groove are meshed together. By starting the transmission motor to drive the meshing gear to rotate, the meshing gear can provide the kinetic energy for movement to the elastic blade 4 through the meshing groove.

[0055] The punching unit 2 includes an elastic blade 4. The end of the elastic blade 4 away from the blade holder 1 is the cutting edge, and the end of the elastic blade 4 near the blade holder 1 is the back of the blade. Both ends of the elastic blade 4 are connected to the blade drive 5. The blade drive 5 can retract and extend the elastic blade 4. Adjusting the elastic blade 4 can cut the length of the automotive expansion sheet. Then, by retracting and extending both ends of the elastic blade 4 through the blade drive 5, the elastic blade 4 can be moved.

[0056] Here, as Figure 1-3 and Figure 9 As shown, the blade drive 5 includes a housing 18, on which two rotating drums 19 are rotatably connected. The two ends of the elastic blade 4 are respectively wound onto the two rotating drums 19. The elastic blade 4 can be wound and unwound by rotating the rotating drums 19. Two drive motors connected to the rotating drums 19 are also fixedly connected to the housing 18. The drive motors can drive the rotating drums 19 to rotate.

[0057] A connecting rod 20 is installed on the housing 18. The connecting rod 20 is slidably connected to the tool holder 1, so that the connecting rod 20 limits the housing 18 and reduces the displacement deviation when the tool drive 5 drives the elastic tool 4 to move.

[0058] Meanwhile, the housing 18 is also equipped with a temperature sensor 21 opposite to the elastic blade 4. The temperature sensor 21 monitors the temperature of the elastic blade 4 to reduce the cutting performance of the elastic blade 4 due to overheating. When the temperature of the elastic blade 4 is too high, the cutting of the car expansion piece by the elastic blade 4 can be stopped. At this time, the machine can be stopped or the elastic blade 4 can be replaced.

[0059] When the automotive expansion pad is a rubber-like product, the high-temperature elastic blade 4 will affect the edge of the automotive expansion pad, causing the automotive expansion pad to roll up unevenly. The temperature can be monitored by the temperature sensor 21 to avoid this problem.

[0060] Example 4

[0061] like Figure 1 - Figure 4 As shown, this embodiment discloses the structure of the adjustment unit 3 based on the above embodiment 3. The adjustment unit 3 includes a first multi-degree-of-freedom robotic arm 6 fixedly connected to the knife holder 1. The first multi-degree-of-freedom robotic arm 6 is equipped with a knife bar support 7. The knife bar support 7 can be a rod-shaped structure. The knife bar support 7 can be rotated according to user needs. The knife bar support 7 can abut against the side of the elastic knife bar 4 near the back of the knife. It leaves a distance from the blade of the elastic knife bar 4 so that it can punch and cut the expansion sheet substrate.

[0062] Meanwhile, in order to reduce the friction force experienced by the elastic blade 4 when it moves, the sides of the elastic blade 4 and the side walls of the blade support 7 can both be smooth surfaces and coated with lubricating oil.

[0063] Of course, the blade support 7 can also be used as a rotating rod to further reduce the friction force on the elastic blade 4 when it moves by rotating the blade support 7.

[0064] Furthermore, a limiting strip 8 is fixedly connected to the outer side of the blade support 7 and at a position close to the blade holder 1 of the elastic blade 4 to limit the back of the elastic blade 4, so that the elastic blade 4 will not have vertical displacement during impact.

[0065] At this time, when the elastic blade 4 is adjusted, the first multi-degree-of-freedom robotic arm 6 drives the blade support 7 and the limiting blade 8 to move, so that the blade support 7 and the side of the elastic blade 4 abut against each other, and the limiting blade 8 and the back of the blade of the elastic blade 4 abut against each other. When the blade support 7 and the elastic blade 4 abut against each other, the elastic blade 4 can be pushed to bend, thereby adjusting the shape of the elastic blade 4.

[0066] Example 5

[0067] like Figure 1 - Figure 3 and Figure 5As shown, this embodiment discloses another structure of the adjustment unit 3 based on the above embodiment four. The adjustment unit 3 includes a blade support 7, a blade limiting bar 8, a magnet seat 9, and an electromagnet core column 10. The magnet seat 9 is installed on the side of the blade holder 1 away from the punching unit 2. The electromagnet core column 10 is installed on the magnet seat 9. Both the magnet seat 9 and the electromagnet core column 10 can move on the blade holder 1. The blade support 7 is installed on the side of the blade holder 1 close to the punching unit 2. The magnet seat 9 and the blade support 7 are magnetically attracted to each other. When the electromagnet core column 10 is energized, it is magnetically attracted to the blade support 7. The magnetic force of the electromagnet core column 10 is greater than the magnetic force of the magnet seat 9.

[0068] The limiting bar 8 is fixedly connected to the bar support 7. The bar supports 7 of the multiple adjustment units 3 are located on the inner and outer sides of the elastic bar 4, respectively. When adjusting the elastic bar 4, the electromagnet core column 10 is de-energized, and then the magnet seat 9 is moved. The magnetic force between the magnet seat 9 and the bar support 7 can drive the bar support 7 to move, allowing the bar support 7 to push the elastic bar 4, thus bending the elastic bar 4. At the same time, the limiting bar 8 limits the back of the elastic bar 4. After the elastic bar 4 is adjusted, the electromagnet core column 10 is energized, so that the electromagnet core column 10 releases a greater magnetic force to position the elastic bar 4.

[0069] At the same time, such as Figure 5 As shown, in order to automatically control the movement of the magnet base 9, a second multi-degree-of-freedom robotic arm 11 is also fixedly connected to the tool holder 1. The second multi-degree-of-freedom robotic arm 11 is connected to the magnet base 9 and can drive the magnet base 9 to move on the tool holder 1.

[0070] Example 6

[0071] like Figure 2 - Figure 3 and Figure 6 As shown, this embodiment further discloses the structure of the blade support 7 based on the above embodiment five. Specifically, the blade support 7 and the first multi-degree-of-freedom robotic arm 6 are fixedly connected and cannot be rotated. An elastic support plate 13 is assembled on the outer side of the blade support 7. The elastic support plate 13 is a flexible plate that can be bent into an arc shape. The bending arc of the position where the elastic support plate 13 and the elastic blade 4 abut is adjustable. By adjusting the bending arc of the position where the elastic support plate 13 and the elastic blade 4 abut, the bending part of the elastic blade 4 can be formed into an arc with different inner diameters, thereby adapting to more shapes of the elastic blade 4.

[0072] Example 7

[0073] like Figure 6 - Figure 8As shown, this technical solution discloses a method for adjusting the elastic support plate 13. Specifically, a horizontal moving part 12 is mounted on the blade support 7, and the horizontal moving part 12 is connected to the middle position of the elastic support plate 13. This is used to adjust the distance between the middle position of the elastic support plate 13 and the blade support 7, and to position the middle position of the elastic support plate 13. Two small turntables 14 are also mounted on the blade support 7. A second horizontal moving part 15 is fixedly connected to each of the two small turntables 14, and a connecting ring 17 is mounted on each of the two horizontal moving parts 15. Inner rails 16 are fixedly connected to both sides of the elastic support plate 13 near the blade support 7 and at the connection between the elastic support plate 13 and the first horizontal moving part 12. The connecting rings 17 are slidably connected to the inner rails 16. At this time, the angle of the second horizontal moving part 15 can be adjusted by rotating the small turntables 14. Then, the second horizontal moving part 15 drives the connecting rings 17 to move, thereby moving the two ends of the elastic support plate 13 and adjusting the curvature of the elastic support plate 13.

[0074] Here, both horizontal moving part 12 and horizontal moving part 2 15 are linear moving parts, such as electric push rods and electric slides.

[0075] like Figure 1 - Figure 9 As shown, a smart cutting method for automotive expansion plates includes the following steps:

[0076] Step 1: Adjust the path around the punch unit 2 by starting the adjustment unit 3 until the inner edge of the punch unit 2 overlaps with the inner edge of the automotive expansion piece;

[0077] like Figure 1 - Figure 4 As shown, step 1 is disclosed in detail here. Specifically, the first multi-degree-of-freedom robotic arm 6 drives the blade support 7 and the blade limiting bar 8 to move, so that the blade support 7 and the side of the elastic blade 4 abut against each other, and the blade limiting bar 8 and the back of the elastic blade 4 abut against each other. When the blade support 7 and the elastic blade 4 abut against each other, the elastic blade 4 can be pushed to bend, thereby adjusting the path around which the punch unit 2 is surrounded.

[0078] Step 2: The stamping equipment drives the tool holder 1 and the punch unit 2 to move vertically, so that the punch unit 2 moves to the expansion plate substrate. The tool bar drive 5 is activated to drive the punch unit 2 to move along its surrounding path, and the inner edge of the automotive expansion plate is stamped and cut into shape.

[0079] Among them, such as Figure 1 - Figure 3 and Figure 9As shown, starting the blade drive 5 starts the drive motor, which drives the rotating drum 19 to rotate. By rotating the two rotating drums 19, the two ends of the elastic blade 4 are wound up and unwound respectively, so that the elastic blade 4 can move along the path it surrounds.

[0080] Step 3: Adjust the path around the punch unit 2 by starting the adjustment unit 3 until the outer edge of the punch unit 2 overlaps with the outer edge of the automotive expansion piece;

[0081] Step 4: The stamping equipment drives the tool holder 1 and the punch unit 2 to move vertically, so that the punch unit 2 moves onto the expansion plate substrate. The tool bar drive 5 is activated to drive the punch unit 2 to move along its surrounding path, and the outer edge of the automotive expansion plate is stamped and cut into shape.

[0082] Here, the stamping equipment is only a structure that drives the tool holder 1 to move. It can also be replaced by structures that can drive the tool holder 1 to move, such as electric push rods or robotic arms. The stamping equipment is existing technology and will not be described in detail.

[0083] Working Principle: In this solution, the punch unit 2 is first adjusted to the corresponding shape of the car expansion piece. Then, the car expansion piece is placed on the punch unit 2, and the stamping structure is used to stamp and shear the car expansion piece. The punch unit 2 is a flexible blade structure, which is existing technology and can withstand pressure, so it will not be elaborated further. After pressing, the motor on the blade drive component 5 drives the two rotating drums 19 through the drive structure, which can complete the raising and lowering of the blade. It can also drive the flexible punch unit 2 to rotate within a small range to complete the rotational cutting. At this time, the basically formed car expansion piece is held in hand, and the corresponding shaped punch unit 2 is used to rotate and cut the edge of the car expansion piece to reduce curling and burrs. In this way, after stamping and cutting, the edge of the car expansion piece is trimmed again. This solution uses a flexible blade structure instead of the hard blade structure of the traditional solution. It can not only be adjusted according to the corresponding shape to adapt to different shapes of car expansion pieces, but the flexible structure is also easier to store. In the whole process, the edge of the car expansion piece can also be trimmed, which greatly improves the cutting efficiency.

[0084] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. An intelligent cutting device for automobile expansion sheet, comprising a knife seat (1) and a stamping device, characterized in that: the knife seat (1) is provided with: a punch knife unit (2) installed on the front side of the knife seat (1) and arranged in a circle, the end of the punch knife unit (2) away from the knife seat (1) being a cutting edge, the end of the punch knife unit (2) close to the knife seat (1) being a cutting back, the cutting edge to the cutting back of the punch knife unit (2) being the cutting direction of the punch knife unit (2), the punch knife unit (2) being freely bendable in a direction perpendicular to the cutting direction of the punch knife unit (2); a plurality of adjusting units (3) installed on the knife seat (1) and connected with the punch knife unit (2), the adjusting units (3) being capable of bending any position of the punch knife unit (2) for adjusting the path around which the punch knife unit (2) is arranged; a knife strip driving member (5) installed on the knife seat (1) for driving the punch knife unit (2) to move along the path around which the punch knife unit (2) is arranged; the punch knife unit (2) comprises elastic knife strips (4) connected head to tail, the end of the elastic knife strip (4) away from the knife seat (1) being a cutting edge, the end of the elastic knife strip (4) close to the knife seat (1) being a cutting back; the punch knife unit (2) comprises elastic knife strips (4), the end of the elastic knife strip (4) away from the knife seat (1) being a cutting edge, the end of the elastic knife strip (4) close to the knife seat (1) being a cutting back, both ends of the elastic knife strip (4) being connected with the knife strip driving member (5); the adjusting unit (3) comprises a knife strip support (7), a knife strip limiting piece (8), a magnet seat (9) and an electromagnetic iron core column (10), the magnet seat (9) being installed on the side of the knife seat (1) away from the punch knife unit (2), the electromagnetic iron core column (10) being installed on the magnet seat (9), the knife strip support (7) being installed on the side of the knife seat (1) close to the punch knife unit (2), the magnet seat (9) and the knife strip support (7) magnetically attracting each other, the electromagnetic iron core column (10) magnetically attracting the knife strip support (7) after being electrified, and the magnetic force of the electromagnetic iron core column (10) being greater than the magnetic force of the magnet seat (9); the knife strip limiting piece (8) is fixedly connected to the knife strip support (7), and the knife strip supports (7) of the plurality of adjusting units (3) are respectively located on the inner side and the outer side of the elastic knife strip (4). Another punch knife unit (2) is further provided, the punch knife unit (2) is installed on the front side of the knife seat (1) and located on the outer side of the first punch knife unit (2), and the knife seat (1) is further provided with a knife strip driving member (5) connected with the punch knife unit (2) located on the outer side and a plurality of adjusting units (3). The adjusting unit (3) comprises a first multi-degree-of-freedom mechanical arm (6) fixedly connected to the knife seat (1), the first multi-degree-of-freedom mechanical arm (6) is provided with a knife strip support (7), the knife strip support (7) can abut against the position close to the cutting back on the side of the elastic knife strip (4), and the outer side of the knife strip support (7) and located at the position close to the knife seat (1) of the elastic knife strip (4) is fixedly connected with a knife strip limiting piece (8) for limiting the cutting back of the elastic knife strip (4). ​ ​ ​ ​ ​ ​ 2. The intelligent cutting device for automobile expansion sheet according to claim 1, characterized in that: ​ ​ 3. The intelligent cutting device for automobile expansion sheet as claimed in claim 2, wherein: ​ 4. The intelligent cutting device for automobile expansion sheet as claimed in claim 3, wherein: The blade driving part (5) comprises a shell (18), two rotating drums (19) are rotatably connected to the shell (18), both ends of the elastic blade (4) are wound on the two rotating drums (19) respectively, two driving motors connected with the rotating drums (19) are fixedly connected to the shell (18), a connecting rod (20) is installed on the shell (18), the connecting rod (20) is slidably connected to the blade holder (1), and a temperature sensor (21) opposite to the elastic blade (4) is assembled on the shell (18).

5. The intelligent cutting device for automobile expansion sheet as claimed in claim 4, wherein: The outer side of the blade support (7) is provided with an elastic support piece (13), and the bending curvature of the position where the elastic support piece (13) abuts against the elastic blade (4) is adjustable.

6. The intelligent cutting device for automobile expansion sheet as claimed in claim 5, wherein: The blade support (7) is provided with a horizontal moving part I (12), the horizontal moving part I (12) is connected to the middle position of the elastic support piece (13), two small rotating discs (14) are assembled on the blade support (7), horizontal moving part II (15) is fixedly connected to each of the two small rotating discs (14), connecting rings (17) are assembled on the two horizontal moving part II (15), and inner rails (16) are fixedly connected to the side of the elastic support piece (13) close to the blade support (7) and located on both sides of the connecting position of the elastic support piece (13) and the horizontal moving part I (12). The connecting rings (17) are slidably connected to the inner rails (16).

7. A method for intelligent cutting of automobile expansion sheet using the intelligent cutting device as claimed in any one of claims 1 to 6, wherein: The method comprises the following steps: S1: adjusting the path around the punching blade unit (2) by starting the adjusting unit (3) until the punching blade unit (2) and the inner edge of the automobile expansion sheet overlap; S2: moving the blade holder (1) and the punching blade unit (2) vertically by the stamping equipment, moving the punching blade unit (2) to the expansion sheet base body, starting the blade driving part (5) to drive the punching blade unit (2) to move along the path around the punching blade unit (2), and punching and cutting the inner edge of the automobile expansion sheet to form; S3: adjusting the path around the punching blade unit (2) by starting the adjusting unit (3) until the punching blade unit (2) and the outer edge of the automobile expansion sheet overlap; S4: moving the blade holder (1) and the punching blade unit (2) vertically by the stamping equipment, moving the punching blade unit (2) to the expansion sheet base body, starting the blade driving part (5) to drive the punching blade unit (2) to move along the path around the punching blade unit (2), and punching and cutting the outer edge of the automobile expansion sheet to form.

Images