High-strength steel plate punching machine for light weight of new energy automobile body parts

Abstract

The invention relates to the technical field of stamping, and discloses a high-strength steel plate stamping machine for lightweight of vehicle body parts of new energy vehicles, which comprises an upper stamping die, a lower stamping die arranged at the bottom of the upper stamping die, a steel plate body arranged between the upper stamping die and the lower stamping die, and a stamping unit arranged in the upper stamping die; the upper stamping die comprises a stamping top plate, an air cylinder arranged at the top of the stamping top plate, a sleeve arranged at the bottom of the stamping top plate, a stamping plate arranged at the bottom of an air cylinder push rod and a lower push plate arranged at the bottom of the sleeve. According to the punching tool bit, through the arranged punching component and the arranged extension component, the bearing capacity of the punching tool bit during punching can be improved, punching force can be vertically and evenly distributed to the cutting edge of the punching tool bit, the extension block at the bottommost part and the cutting edge of the punching tool bit jointly punch a steel plate body, and the strength of the cutting edge can be enhanced; the duration of high stress borne by the cutting edge of the stamping tool bit is shortened, abrasion is reduced, and the service life of the stamping tool bit is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of stamping technology, and in particular to a high-strength steel plate stamping machine for lightweighting body parts of new energy vehicles. Background Art

[0002] At present, all countries in the world are vigorously developing new energy vehicles, and my country has listed new energy vehicles as one of the seven strategic emerging industries. As an important part of the body frame, the automobile reinforcement plate not only bears the responsibility of supporting the body, but also plays a vital role in the event of a serious collision accident. Today's high-strength steel and ultra-high-strength steel have well achieved the lightweight of vehicles, improved the collision strength and safety performance of vehicles, and therefore have become an important development direction for automotive steel. In automobile manufacturing, steel plate stamping is a common process. In order to adapt to different body structures and component designs, various forms of stamping are required on steel plates, including punching, stretching, compression, bending, etc. Punching and punching is one of the common operations, which can be achieved by drilling holes in steel plates. Punching can be in the form of single holes or multiple holes, and different hole diameters and positions can be selected as needed.

[0003] In the prior art, when punching holes, a cylindrical cutter head is often used to punch holes in the steel plate. During the punching process, strong friction and shear stress will be generated between the cylindrical cutter head and the steel plate, resulting in a large amount of friction heat and shear deformation on the surface of the steel plate. The cut surface after the shearing fracture will contact the side wall of the punch, causing scratches and generating heat, so that some materials on the fracture surface will adhere to the side wall of the punch, resulting in a sticking phenomenon. After accumulating a lot, a built-up edge is formed; as the built-up edge increases, the punching gap becomes smaller, resulting in burrs and a large amount of material chips. On the other hand, a small gap will accelerate the wear of the punch and reduce its service life; at the same time, the resistance increases, which can easily cause the die or hole to tighten the punch, resulting in mold accidents or even fracture, resulting in wear and performance degradation of the cutter head, and reducing the punching quality and efficiency.

[0004] In order to avoid the occurrence of built-up edge, the existing technology usually makes a negative angle treatment on the cutting edge or punch to increase the avoidance zone, avoids the material section and the cutting edge from scratching as much as possible during punching, reduces the local high temperature and shear stress, and prevents the internal structure of the steel plate from changing, thereby preventing the occurrence of built-up edge. However, the greater the negative angle of the cutting edge and the punch, the larger the avoidance zone, the more it can avoid scraping. But at the same time, the greater the angle, the weaker the strength of the cutting edge, the longer the time the punch is subjected to high stress, the greater the stress on the punch, and the corresponding wear will also be aggravated. Therefore, there is an urgent need for a punching machine that can solve both the problems of built-up edge and low cutting edge punching strength. Summary of the invention

[0005] In view of the problems in the prior art that during stamping, the cutter head is prone to built-up edge and the stamping strength is insufficient, which causes the cutter head to wear, reduces its service life and affects the stamping quality, a high-strength steel plate stamping machine for lightweight body parts of new energy vehicles is proposed.

[0006] The purpose is to avoid friction between the cutter head and the fracture surface of the steel plate, while enhancing the punching strength of the cutting edge of the cutter head, thereby improving the service life and punching quality of the cutter head.

[0007] The technical solution of the present invention is a high-strength steel plate stamping machine for lightweight body parts of new energy vehicles, comprising a stamping upper die, a stamping lower die arranged at the bottom of the stamping upper die, and a steel plate body arranged between the stamping upper die and the stamping lower die, and also comprising a stamping unit arranged inside the stamping upper die; The stamping upper die includes a stamping top plate, a cylinder arranged at the top of the stamping top plate, a sleeve arranged at the bottom of the stamping top plate, a stamping plate arranged at the bottom of the cylinder push rod, and the stamping plate is slidably connected to the inner wall of the bottom of the sleeve, and a lower push plate is arranged at the bottom of the sleeve, and the stamping unit is arranged at the bottom of the stamping plate; The punching unit comprises a punching component arranged at the bottom of the punching plate, and an expansion component arranged in a ring array on the punching component; the punching component is used to punch the steel plate body, and the expansion component is used to expand the punching component during punching; The stamping component includes a stamping column arranged at the bottom of the stamping plate, a stamping cutter head arranged at the bottom of the stamping, a stamping ring arranged at the bottom of the stamping plate and located around the stamping column, and a lower pressing plate arranged at the top of the stamping cutter head.

[0008] Furthermore, the stamping lower die includes a stamping bottom plate arranged at the bottom of the stamping top plate, a supporting plate arranged at the top of the stamping bottom plate, a plurality of positioning rods arranged at the top of the supporting plate, and one end of the steel plate body abuts against the plurality of positioning rods, and a supporting leg arranged at the bottom of the supporting plate.

[0009] Furthermore, the stamping lower die also includes a stamping hole opened in the middle of the bearing plate, and a blanking hole opened at the bottom of the stamping hole.

[0010] Furthermore, the stamping column is in the shape of a truncated cone with a small bottom and a large top, and a movable groove matching the stamping column is provided on the top of the stamping column.

[0011] Furthermore, the side surface of the punching cutter head is inclined, and the diameter of the bottom of the punching cutter head is greater than the diameter of the top thereof.

[0012] Furthermore, the outer edge of the lower pressing plate is slightly longer than the outer edge of the punching ring, and the outer edge of the bottom of the punching cutter head is on the same vertical extension line as the midpoint of the cross section of one side of the lower pressing plate in the vertical direction.

[0013] Furthermore, the expansion component includes expansion holes formed in a circular array on the side wall of the stamping cutter head, three expansion blocks arranged in the expansion holes and distributed from top to bottom, movable holes formed in a circular array on the side wall of the stamping column, extrusion holes formed between two adjacent movable holes, and one side of the three expansion blocks is slidably connected to the extrusion holes, limiting plates symmetrically provided on both sides of the three expansion blocks, three limiting grooves symmetrically provided on both sides of the expansion holes corresponding to horizontal positions, the three limiting plates are slidably provided in the three limiting grooves, and the lengths of the three limiting grooves are longer than the lengths of the three limiting plates, a lifting plate provided at the bottom of the stamping column, and connecting blocks are symmetrically provided on both sides of the expansion block at the bottom, and extension grooves matching the connecting blocks are symmetrically provided on both sides of the bottom of the expansion hole, and the groove walls of the two extension grooves are parallel.

[0014] Furthermore, the outer sides of the three expansion blocks are maintained on the same vertical extension line, and the bottom of the expansion block at the bottom is located on the same horizontal plane as the bottom of the punching cutter head.

[0015] Furthermore, a reset component is arranged between the stamping component and the expansion component; the reset component includes a reset groove opened at the top of the stamping column, and a reset member arranged in the reset groove, and the top of the reset member is fixedly connected to the movable groove.

[0016] Furthermore, a stamping bevel is provided at the bottom of the side wall of the expansion block at the bottom, and the slope of the stamping bevel is the same as the slope of the side of the stamping cutter head, and the height of the stamping bevel in the vertical direction is greater than the thickness of the steel plate body.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up the stamping parts and expansion parts, the bearing capacity of the stamping cutter head during stamping can be improved, and the stamping force can be vertically and evenly distributed to the cutting edge of the stamping cutter head. The bottom expansion block and the cutting edge of the stamping cutter head jointly stamp the steel plate body, which can enhance the strength of the cutting edge, reduce the duration of high stress on the cutting edge of the stamping cutter head, reduce wear, and increase the service life of the stamping cutter head.

[0018] 2. The side of the stamping cutter head is designed to be inclined in order to avoid the side wall of the stamping cutter head from rubbing against the fracture surface of the steel plate after stamping during the stamping process, and to avoid the fracture surface from scratching the stamping cutter head, thereby causing the material on the fracture surface to adhere to the stamping cutter head and form a built-up edge, thereby improving the cleanliness of the stamping cutter head and avoiding the built-up edge from affecting subsequent stamping, thereby ensuring the quality of stamping.

[0019] 3. When the stamping is completed, the waste material falls directly and the expansion block is immediately retracted. While ensuring the stamping strength of the punch head, it can avoid friction between the fracture surface of the punch head and the steel plate body, avoid the adhesion of built-up edge, and avoid the generation of stress and heat after the punch head is rubbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of a partially cutaway bottom view of the structure of the present invention; Figure 3 It is a schematic diagram of the enlarged structure of A in 2 of the present invention; Figure 4 It is a schematic diagram of the overall exploded structure of the punching unit of the present invention; Figure 5 It is a schematic diagram of the overall three-dimensional structure of the punching unit of the present invention; Figure 6 It is a schematic diagram of the overall structure of the stamping component of the present invention; Figure 7 It is a schematic diagram of the overall structure of the expansion component of the present invention; Figure 8 It is a partial front cross-sectional structural schematic diagram of the punching ring and the lower pressing plate of the present invention; Fig. 9 For the present invention Figure 8 The enlarged structural diagram at B in the middle; Fig.10 It is a schematic diagram of the three-dimensional exploded structure of the expansion block of the present invention; Fig.11 It is a schematic diagram of the top structure of the punching unit of the present invention.

[0021] In the figure: Stamping upper die; 11, stamping top plate; 12, cylinder; 13, sleeve; 14, stamping plate; 15, push plate; 2, stamping lower die; 21, stamping bottom plate; 22, bearing plate; 23, positioning rod; 24, stamping hole; 25, blanking hole; 3, steel plate body; 4, stamping component; 41, stamping column; 42, stamping cutter head; 43, stamping ring; 44, lower pressure plate; 45, movable groove; 5, extension component; 51, extension hole; 52, extension block; 53, movable hole; 54, extrusion hole; 55, limit plate; 56, limit groove; 57, lifting plate; 58, connecting block; 59, extension groove; 6, reset component; 61, reset groove; 62, reset part; 7, stamping inclined surface. DETAILED DESCRIPTION In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0022] Example 1, reference Figure 1-Figure 6 , which is the first embodiment of the present invention, provides a high-strength steel plate stamping machine for lightweight body parts of new energy vehicles, including a stamping upper die 1, a stamping lower die 2 installed at the bottom of the stamping upper die 1, and a steel plate body 3 installed between the stamping upper die 1 and the stamping lower die 2, and also includes a stamping unit installed inside the stamping upper die 1; the stamping upper die 1 includes a stamping top plate 11, a cylinder 12 installed on the top of the stamping top plate 11, a sleeve 13 fixedly connected to the bottom of the stamping top plate 11, a stamping plate 14 fixedly connected to the bottom of the push rod of the cylinder 12, and the stamping plate 14 is slidably connected to the inner wall of the bottom of the sleeve 13, and a lower sleeve abutting against the bottom of the sleeve 13. The push plate 15 is provided, and the punching unit is installed at the bottom of the punching plate 14; the punching unit includes a punching component 4 installed at the bottom of the punching plate 14, and an expansion component 5 installed on the punching component 4 in a ring array; the punching component 4 is used to punch the steel plate body 3, and the expansion component 5 is used to expand the punching component 4 during punching to improve the punching bearing capacity of the punching component 4; the punching component 4 includes a punching column 41 fixedly connected to the bottom of the punching plate 14, a punching head 42 slidably connected to the bottom of the punching, a punching ring 43 fixedly connected to the bottom of the punching plate 14 and located around the punching column 41, and a lower pressure plate 44 fixedly connected to the top of the punching head 42.

[0023] Specifically, during stamping, the steel plate body 3 is placed between the stamping upper die 1 and the stamping lower die 2, and the cylinder 12 is started. The stamping plate 14 is pushed downward by the push rod of the cylinder 12. The stamping plate 14 slides downward in the sleeve 13 and pushes the lower push plate 15 downward. The lower push plate 15 pulls the tension spring set on its top and the stamping plate 14 to move downward together to stamp the steel plate body 3; during stamping, the stamping plate 14 pushes the stamping column 41, and the stamping column 41 pushes the cutter head downward. When the stamping cutter head 42 contacts the steel plate body 3, the stamping column 41 continues to move downward. When the stamping ring 43 presses against the lower pressure plate 44, the stamping cutter head 42 starts to stamp the steel plate body 3.

[0024] Reference Figure 1-Figure 2 The stamping lower die 2 includes a stamping bottom plate 21 installed at the bottom of the stamping top plate 11, a supporting plate 22 fixedly connected to the top of the stamping bottom plate 21, a plurality of positioning rods 23 fixedly connected to the top of the supporting plate 22, and one end of the steel plate body 3 abuts against the plurality of positioning rods 23, and a supporting leg fixedly connected to the bottom of the supporting plate 22.

[0025] Specifically, the stamping bottom plate 21 and the bearing plate 22 are used to bear the stamping of the steel plate body 3, and the positioning rod 23 is used to position the steel plate body 3 after it is placed.

[0026] Reference Figure 1-Figure 2The stamping lower die 2 also includes a stamping hole 24 opened in the middle of the bearing plate 22 and a blanking hole 25 opened at the bottom of the stamping hole 24 .

[0027] Specifically, when the steel plate body 3 is punched, the waste generated after the punching falls into the punching hole 24 and falls from the blanking hole 25 to be collected.

[0028] Reference Figure 1-Figure 6 The punching column 41 is in the shape of a truncated cone with a small bottom and a large top, and a movable groove 45 matching the punching column 41 is opened on the top of the punching column 41 .

[0029] Specifically, the stamping column 41 is designed to push the expansion component 5 when it moves downward, expanding the expansion component 5 so that the expansion component 5 can evenly share the stamping force exerted on the stamping cutter head 42, thereby avoiding excessive fatigue of the cutting edge at the bottom of the cutter head due to long-term stress, thereby increasing the service life of the stamping cutter head 42.

[0030] Reference Figure 4 and Figure 6 The side surface of the punching cutter head 42 is inclined, and the diameter of the bottom of the punching cutter head 42 is greater than the diameter of the top thereof.

[0031] Specifically, the side surface of the stamping cutter head 42 is designed to be inclined in order to avoid the side wall of the stamping cutter head 42 from rubbing against the fracture surface of the steel plate after stamping during the stamping process, and to avoid the fracture surface from scratching the stamping cutter head 42, thereby causing the material on the fracture surface to adhere to the stamping cutter head 42 and form a built-up edge, thereby improving the cleanliness of the stamping cutter head 42 and avoiding the built-up edge from affecting subsequent stamping, thereby ensuring the quality of stamping.

[0032] Reference Figure 8-Figure 9 The outer edge of the lower pressing plate 44 is slightly longer than the outer edge of the punching ring 43, and the outer edge of the bottom of the punching cutter head 42 is on the same vertical extension line as the midpoint of the cross section of one side of the lower pressing plate 44 in the vertical direction.

[0033] Specifically, the outer edge of the lower pressure plate 44 is slightly longer than the outer edge of the stamping ring 43, so that the stamping pressure received by the lower pressure plate 44 can be symmetrical about the central axis of the cross section on one side thereof while ensuring the stamping support strength of the lower pressure plate 44. When the expansion component 5 is fully expanded, the projection of the side of the expansion component 5 in the vertical direction completely coincides with the circle formed by the cutting edge at the bottom of the stamping cutter head 42, and the side of this circle is on the central axis of the cross section on one side of the lower pressure plate 44 and the stamping ring 43, that is, the stamping pushes the lower pressure plate 44, the lower pressure plate 44 pushes the stamping cutter head 42, and the expansion component 5 is fully expanded, so that the stamping pressure received by the lower pressure plate 44 can be symmetrically concentrated on the cutting edge of the stamping cutter head 42 along the central axis, so that the cutting edge at the bottom of the stamping cutter head 42 can quickly stamp the steel plate body 3, thereby improving the stamping efficiency.

[0034] Example 2, reference Figure 1-Figure 7 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the expansion component 5 includes expansion holes 51 formed in an annular array on the side wall of the punching cutter head 42, three expansion blocks 52 slidably connected to the expansion holes 51 and distributed from top to bottom, a movable hole 53 formed in an annular array on the side wall of the punching column 41, an extrusion hole 54 formed between two adjacent movable holes 53, and one side of the three expansion blocks 52 is slidably connected to the extrusion hole 54, and the limiting plates 55 symmetrically fixedly connected to the two sides of the three expansion blocks 52 respectively correspond to the three limiting grooves 56 symmetrically formed on the two sides of the expansion hole 51 at the horizontal position, and the three limiting plates 55 respectively correspond to the three limiting grooves 56 symmetrically formed on the two sides of the expansion hole 51 at the horizontal position. Corresponding sliding connections are in the three limit grooves 56, and the length of the three limit grooves 56 is longer than the length of the three limit plates 55. The lifting plate 57 is detachably connected to the bottom of the stamping column 41, and the two sides of the expansion block 52 at the bottom are symmetrically fixedly connected with connecting blocks 58, and the two sides of the bottom of the expansion hole 51 are symmetrically provided with extension grooves 59 matching the connecting blocks 58, and the groove walls of the two extension grooves 59 are parallel. The connecting block 58 is slidably connected in the extension groove 59, and the groove walls of the two extension grooves 59 are parallel, so that the expansion block 52 at the bottom can form a complete circle with the cutting edge of the stamping head 42 when expanded, thereby ensuring the neatness of the punching edge.

[0035] Specifically, when the stamping column 41 moves downward, the stamping column 41 squeezes the three expansion blocks 52 simultaneously through the movable hole 53 and the extrusion hole 54, so that the three expansion blocks 52 can move synchronously toward the edge of the stamping cutter head 42. When the stamping column 41 moves downward so that the three expansion blocks 52 are completely moved into place and overlap with the cutting edge of the stamping cutter head 42, the stamping ring 43 just abuts against the lower pressing plate 44. The setting of the limiting plate 55 is to limit the movement of the three expansion blocks 52 and to re-apply the pressure on the expansion blocks 52 to the stamping cutter head 42 through the limiting plate 55, so as to realize the stamping of the steel plate body 3 by the cutter head, and the expansion blocks 5 2 is fan-shaped, and the limit block is also fan-shaped. During the movement of the limit block in the limit groove 56, it will never leave the limit groove 56, ensuring that the expansion block 52 can apply the pressure it receives to the punching cutter head 42; the three expansion blocks 52 can be replaced with an integral shape, and the three are arranged to facilitate subsequent maintenance or replacement. Since the expansion block 52 at the bottom directly punches the steel plate root body after being unfolded, its edge is prone to wear or damage. When wear occurs, the lifting plate 57 can be directly disassembled and the expansion block 52 at the bottom can be replaced, avoiding the need to replace the entire expansion block 52 and avoiding waste of materials. When the punching cutter head 42 punches the waste material and causes it to fall, the waste material no longer generates resistance to the punching cutter head 42, so that the resetting component 6 is reset and the punching column 41 is reset inside the punching cutter head 42, so that the three expansion blocks 52 are immediately reset and retracted, thereby preventing the expansion blocks 52 from rubbing against the fracture surfaces formed after punching, and the lifting plate 57 is driven upward by the punching, thereby simultaneously driving the expansion block 52 at the bottom upward, that is, simultaneously driving the entire punching cutter head 42 upward, thereby preventing the punching cutter head 42 from falling during the resetting process.

[0036] Reference Figure 1-Figure 8 The outer sides of the three expansion blocks 52 are maintained on the same vertical extension line, and the bottom of the expansion block 52 at the bottom is located on the same horizontal plane as the bottom of the punching head 42.

[0037] Specifically, the outer side surfaces of the three expansion blocks 52 are maintained on the same vertical extension line to ensure the consistency of the forces on the edges of the three expansion blocks 52, so that the force on the lower pressure plate 44 can be better transmitted to the cutting edge at the bottom of the punching cutter head 42, and the three expansion blocks 52 can improve the bearing capacity of the punching cutter head 42 during punching, and can vertically and evenly distribute the punching force to the cutting edge of the punching cutter head 42. The bottommost expansion block 52 and the cutting edge of the punching cutter head 42 jointly punch the steel plate body 3, which can enhance the strength of the cutting edge, reduce the duration of high stress on the cutting edge of the punching cutter head 42, reduce wear, and increase the service life of the punching cutter head 42. The remaining structure is the same as that of Example 1.

[0038] Example 3, reference Figure 1-Figure 4, which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: a reset component 6 is installed between the stamping component 4 and the expansion component 5; the reset component 6 includes a reset groove 61 opened at the top of the stamping column 41, and a reset member 62 fixedly connected to the reset groove 61, and the top of the reset member 62 is fixedly connected to the movable groove 45.

[0039] Specifically, during resetting, the reset member 62 is reset, and the reset member 62 can be a spring, so that the reset member 62 pops up the stamping cutter head 42 downward, so that the expansion block 52 quickly shrinks into the stamping cutter head 42, and the waste is directly ejected from the drop port, thereby realizing rapid collection of the waste.

[0040] Reference Figure 1-Figure 11 The bottom of the side wall of the expansion block 52 at the bottom is provided with a stamping slope 7, and the slope of the stamping slope 7 is the same as the slope of the side of the stamping cutter head 42, and the height of the stamping slope 7 in the vertical direction is greater than the thickness of the steel plate body 3. The rest of the structure is the same as that of the second embodiment.

[0041] Specifically, when the stamping cutter head 42 is stamping, the three expansion blocks 52 are fully expanded, and the bottom expansion block 52 and the cutting edge at the bottom of the stamping cutter head 42 jointly stamp the steel plate body 3. The stamping bevel 7 and the slope of the side of the stamping cutter head 42 are the same, so that during the stamping process of the steel plate body 3, the stamping bevel 7 and the side wall of the expansion block 52 will not rub against the fracture surface of the steel plate body 3. When the stamping is completed, the waste material falls directly and the expansion block 52 is immediately retracted. While ensuring the stamping strength of the stamping cutter head 42, friction between the stamping cutter head 42 and the fracture surface of the steel plate body 3 can be avoided, as well as the adhesion of built-up edge and the generation of stress and heat after the stamping cutter head 42 is rubbed.

[0042] In summary, the working principle of the present invention is as follows: during stamping, the steel plate body 3 is placed between the stamping upper die 1 and the stamping lower die 2, and the cylinder 12 is started, so that the push rod of the cylinder 12 pushes the stamping plate 14 and the stamping column 41 downward. During the downward movement, after the stamping cutter head 42 is resisted by the baffle body, the stamping column 41 continues to move in the movable groove 45, so that the stamping column 41 pushes the three expansion blocks 52 to the surrounding areas to expand synchronously, and the stamping ring 43 presses down the lower pressure plate 44, so that the lower pressure plate 44 pushes the stamping cutter head 42 and the expansion block 52 to stamp the steel plate body 3 at the same time. After the stamping is completed, the reset member 62 resets and pushes the stamping cutter head 42 downward, so that the stamping cutter head 42 pops out the waste material downward, and at the same time, the expansion block 52 is driven by the extrusion hole 54 in the stamping column 41 to shrink into the stamping cutter head 42, so as to avoid friction between the expansion block 52 and the fracture surface formed after stamping.

Claims

1. A high-strength steel plate stamping machine for lightweighting body parts of new energy vehicles, comprising a stamping upper die (1), a stamping lower die (2) arranged at the bottom of the stamping upper die (1), and a steel plate body (3) arranged between the stamping upper die (1) and the stamping lower die (2), characterized in that: It also includes a stamping unit arranged inside the stamping upper die (1); The stamping upper die (1) comprises a stamping top plate (11), a cylinder (12) arranged at the top of the stamping top plate (11), a sleeve (13) arranged at the bottom of the stamping top plate (11), a stamping plate (14) arranged at the bottom of a push rod of the cylinder (12), the stamping plate (14) being slidably connected to the inner wall of the bottom of the sleeve (13), and a lower push plate (15) arranged at the bottom of the sleeve (13), and the stamping unit is arranged at the bottom of the stamping plate (14); The punching unit comprises a punching component (4) arranged at the bottom of a punching plate (14), and expansion components (5) arranged in a ring array on the punching component (4); the punching component (4) is used to punch the steel plate body (3), and the expansion component (5) is used to expand the punching component (4) during punching; The stamping component (4) comprises a stamping column (41) arranged at the bottom of the stamping plate (14), a stamping cutter head (42) arranged at the stamping bottom, a stamping ring (43) arranged at the bottom of the stamping plate (14) and located around the stamping column (41), and a lower pressing plate (44) arranged at the top of the stamping cutter head (42).

2. The high-strength steel plate punching machine for lightweight new energy vehicle body parts according to claim 1 is characterized in that: The stamping lower die (2) comprises a stamping bottom plate (21) arranged at the bottom of the stamping top plate (11), a bearing plate (22) arranged at the top of the stamping bottom plate (21), a plurality of positioning rods (23) arranged at the top of the bearing plate (22), one end of the steel plate body (3) abutting against the plurality of positioning rods (23), and a supporting leg arranged at the bottom of the bearing plate (22).

3. The high-strength steel plate punching machine for lightweight new energy vehicle body parts according to claim 2 is characterized in that: The stamping lower die (2) further comprises a stamping hole (24) formed in the middle of the bearing plate (22), and a blanking hole (25) formed in the bottom of the stamping hole (24).

4. The high-strength steel plate punching machine for lightweight new energy vehicle body parts according to claim 1, characterized in that: The punching column (41) is in the shape of a truncated cone with a small bottom and a large top, and a movable groove (45) matching the punching column (41) is provided on the top of the punching column (41).

5. The high-strength steel plate punching machine for lightweight new energy vehicle body parts according to claim 1, characterized in that: The side surface of the punching tool head (42) is inclined, and the diameter of the bottom of the punching tool head (42) is greater than the diameter of the top thereof.

6. The high-strength steel plate punching machine for lightweight new energy vehicle body parts according to claim 5, characterized in that: The outer edge of the lower pressing plate (44) is slightly longer than the outer edge of the punching ring (43), and the outer edge of the bottom of the punching cutter head (42) is on the same vertical extension line as the midpoint of a cross section on one side of the lower pressing plate (44).

7. The high-strength steel plate punching machine for lightweight new energy vehicle body parts according to claim 1, characterized in that: The expansion component (5) comprises expansion holes (51) formed in an annular array on the side wall of the punching tool head (42), three expansion blocks (52) arranged in the expansion holes (51) and distributed from top to bottom, movable holes (53) formed in an annular array on the side wall of the punching column (41), and an extrusion hole (54) formed between two adjacent movable holes (53), one side of the three expansion blocks (52) being slidably connected to the extrusion hole (54), and limiting plates (55) symmetrically arranged on both sides of the three expansion blocks (52), respectively corresponding to horizontal positions and symmetrically opened at Three limit grooves (56) are provided on both sides of the expansion hole (51), and three limit plates (55) are slidably arranged in the three limit grooves (56) respectively, and the length of the three limit grooves (56) is longer than the length of the three limit plates (55). A lifting plate (57) is provided at the bottom of the punching column (41), and connecting blocks (58) are symmetrically arranged on both sides of the expansion block (52) at the bottom, and extension grooves (59) matching the connecting blocks (58) are symmetrically opened on both sides of the bottom of the expansion hole (51), and the groove walls of the two extension grooves (59) are parallel.

8. The high-strength steel plate punching machine for lightweight new energy vehicle body parts according to claim 7, characterized in that: The outer sides of the three expansion blocks (52) are maintained on the same vertical extension line, and the bottom of the expansion block (52) at the bottom is located on the same horizontal plane as the bottom of the punching cutter head (42).

9. The high-strength steel plate punching machine for lightweight new energy vehicle body parts according to claim 7, characterized in that: A reset component (6) is provided between the punching component (4) and the expansion component (5); the reset component (6) comprises a reset groove (61) provided at the top of the punching column (41), and a reset member (62) provided in the reset groove (61), and the top of the reset member (62) is fixedly connected to the movable groove (45).

10. The high-strength steel plate punching machine for lightweight new energy vehicle body parts according to claim 7, characterized in that: A stamping bevel (7) is provided at the bottom of the side wall of the expansion block (52) at the bottom, and the slope of the stamping bevel (7) is the same as the slope of the side of the stamping cutter head (42), and the height of the stamping bevel (7) in the vertical direction is greater than the thickness of the steel plate body (3).

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