Metal stamping device and method for a metal control arm of a vehicle

Abstract

The application relates to the technical field of metal stamping forming, and discloses a metal stamping device and method for an automobile metal control arm, which comprises a lower base, a die mechanism, an upper base, a hydraulic device and a control panel. In the application, stamping structures are sequentially stamped to the left and right sides in the middle of a steel plate, and the bending positions of the steel plate are sequentially outwardly stamped in cooperation with a force transmission mechanism and a bending structure, so that the stress of the stamping deformation of the steel plate is sequentially diffused from the middle to the outside, the uneven stress distribution of the hard stamping forming of the steel plate is avoided, and the partial overload and deformation fracture of the control arm after the stamping forming are avoided. When a force arm lever supports a bending plate to a required bending shape, an arc-shaped block will first stamp the bottom of the bending position of the steel plate, at this time, the stress of the steel plate will be diffused to the upper part of the bending position, and the stress is diffused to the outside under the slow bending of the upper part, so that the bending position of the steel plate is sequentially bent from the bottom to the top and the stress is transmitted, and the stress accumulation caused by the continuous bending of the steel plate is avoided.

Description

Technical Field

[0001] This invention relates to the field of metal stamping technology, specifically to a metal stamping device and method for automotive metal control arms. Background Technology

[0002] Automotive metal control arms, also known as suspension arms, swing arms, or linkages, are rigid load-bearing and guiding components made of high-strength steel or aluminum alloy in automotive suspension systems. They are used to connect the wheel steering knuckle to the vehicle body (or subframe), transmit and bear multi-directional forces (longitudinal, lateral, and vertical), and achieve elastic connection through bushings and ball joints to control wheel movement trajectory, maintain wheel positioning, and filter road impacts. Since automotive control arms are commonly A-shaped (fork-shaped) or L-shaped, they are curved or zigzag-shaped to adapt to the suspension space and mechanical requirements. In the middle, two flat plates are stamped to form a three-dimensional structure with complex curved surfaces, and then welded together to form a hollow structure to improve bending stiffness.

[0003] However, when stamping the control arm, a hollow state is required to enhance its strength. This necessitates a concave indentation in the steel plate, resulting in a bent position. Existing technology uses a forming mold for direct stamping, and the indentation shape typically includes both arc and straight lines. The deformation stress generated in the steel plate differs between arc and straight positions during stamping, leading to uneven stress distribution and potential breakage due to uneven stress distribution across the control arm. Furthermore, when the steel plate is bent, two bending points simultaneously undergo forced deformation bending, causing stress accumulation at the two bending points in the middle of the bending position, which affects the stress balance of the control arm. Summary of the Invention

[0004] This invention provides a metal stamping device and method for automotive metal control arms, which overcomes the shortcomings described in the background art.

[0005] The technical solution adopted by this invention to solve its technical problem is: A metal stamping device for an automotive metal control arm includes a lower base, a mold mechanism, an upper base, a hydraulic press, and a control panel. The mold mechanism is horizontally fixed on the surface of the lower base, and the hydraulic press inside the upper base is vertically aligned with the surface of the mold mechanism. The hydraulic press is driven to extend and retract by an electrical signal from the control panel on the side of the upper base, and the output end of the hydraulic press is used to stamp the steel plate on the surface of the mold mechanism. The mold mechanism includes a force transmission mechanism, a bending structure, a support plate, a stamping structure, a base plate, and an elastic rail. The elastic rail moves elastically up and down on the lower side of the stamping structure corresponding to the edge of the support plate. The support plate is horizontally fixed to the surface of the lower base plate through the lower base plate. The bending structure provided on the inner side of the support plate guides the bending of the steel plate. The force transmission mechanism supports the bending structure with levers inside the base plate. The stamping structure is connected and fixed to the lower end of the hydraulic device and drives the stamping structure to stamp the steel plate downwards from the middle of the base plate to the left and right sides in sequence. The bending structure includes a bending plate, a hinge block, and a horizontal plate. The bending plate and the hinge block fixed inside the support plate rotate together. The bottom plate has a recessed area in the shape of an indentation groove in the middle. Adjacent bending plates are arranged in a series of arc-shaped or straight-line intervals along the edge of the indentation groove. The force transmission mechanism lever supports the horizontal plate at the lower end of the bending plate to keep it horizontal. The stamping structure includes a first pressure plate, a forming structure, a telescopic rod, a second pressure plate, and a fixed plate. The first pressure plate and the second pressure plate are elastically connected to the lower end of the fixed plate through the telescopic rod. The forming structure is symmetrically fixed to the lower side of the fixed plate. The first pressure plate and the second pressure plate are elastically pressed against the corresponding bottom plate surfaces. When the telescopic rod reaches its elastic limit, the first pressure plate and the second pressure plate are at the same level. The outer side of the forming structure is perpendicularly stamped to the shape of the outer side of the hinge block.

[0006] A preferred technical solution: The force transmission mechanism is provided with a rotating shaft seat, a lever arm, and an inclined rod. The rotating shaft seat is fixed inside the base plate. The right end of the lever arm and the left end of the inclined rod are fixed on the left and right sides of the rotating shaft seat. The "L"-shaped lever arm protrudes from the surface of the base plate, and the upper end of the inclined rod abuts against the lower end of the horizontal plate. The stamping structure stamps the position of the lever arm and causes the lever arm to drive the inclined rod to rotate around the rotating shaft seat as a lever.

[0007] A preferred technical solution: The forming structure includes a spring, an arc-shaped block, a force-bearing plate, and an arc plate. The arc-shaped block is fixed to the lower end of the force-bearing plate, and the lower end of the arc plate rotates via a hinge at the upper end of the arc-shaped block. Three springs arranged vertically are elastically connected to the side of the force-bearing plate on the side of the arc plate. When the springs are compressed to their limit, the upper end of the arc plate presses against the side of the force-bearing plate. The bottom of the steel plate at the bending position is elastically bent by the arc plate under the elasticity of the bending plate.

[0008] A metal stamping method for an automotive metal control arm, based on the aforementioned metal stamping device for an automotive metal control arm, specifically includes the following steps: S1: Intermediate stamping: The steel plate is placed on the surface of the support plate, and the stamping structure at the lower end of the hydraulic device is driven by the control panel to move downward hydraulically. Thus, the first pressure plate in the stamping structure is corresponding to the steel plate for stamping. The first pressure plate and the second pressure plate are used to stamp from the middle to the left and right sides in sequence, so that the metal deformation effect of the steel plate is dispersed from the middle to the outer sides.

[0009] S2: First bend: When the steel plate is stamped in the middle, the bending position of the steel plate is tilted due to the obstruction of the bending plate. Then, during the process of the second pressure plate driving the steel plate to press the upper end of the force arm, the force arm drives the tilting lever to support the horizontal plate. Thus, the horizontal plate supports the bending plate to rotate in the direction corresponding to the lower side of the steel plate, and causes the bending plate and the forming structure to produce mutual stamping deformation at the bending position of the steel plate.

[0010] S3: Second bend: When the steel plate is bent along the deformation of the bending plate during stamping, the outer side of the forming structure corresponds to the inner side of the bending plate, which moves elastically. At this time, the arc plate is driven by the steel plate to compress the spring, and the arc block squeezes the steel plate to the lower side of the bending plate for stamping.

[0011] S4: Third bending stamping: When the arc-shaped block presses the bottom of the steel plate at the bending position, the stress of the steel plate diffuses outward. At this time, the elasticity of the arc-shaped plate rotates under the obstruction of the steel plate and compresses the spring, causing the steel plate to slowly bend along the corresponding shape of the arc-shaped plate and the bending plate and diffuse the stress outward.

[0012] Compared with existing technologies, this technical solution has the following advantages: In this invention, the operator controls the hydraulic actuator via a control panel on the side of the lower base, causing the stamping structure to hydraulically impact the steel plate placed on the support plate surface. The middle of the stamping structure contacts the steel plate first, and then stamps from the middle of the steel plate outwards to the left and right. In conjunction with the force transmission mechanism and bending structure, the bending position of the steel plate is stamped outwards in sequence, so that the stress of the stamping deformation of the steel plate is diffused from the middle to the outside. This avoids uneven stress distribution during hard stamping of the steel plate and prevents the control arm from being locally overloaded and deformed after stamping.

[0013] In this invention, when the lever arm supports the bending plate to the desired bending shape, the steel plate undergoes final stamping deformation at the bottom of the bending position while the deformation in the middle of the steel plate is completed. As the bottom of the bending position is stamped, the upper part of the bending position is also slowly stamped into an arc-shaped bending state by the arc plate, gradually dispersing the stress and reducing the deformation stress of the final stamping and bending. Since the stamping structure is a downward vertical stamping, the arc block will first stamp the bottom of the bending position of the steel plate. At this time, the bending force at the bottom of the bending position is greater than that at the top, and the stress of the steel plate will diffuse to the upper part of the bending position. Under the slow bending at the top, the stress will diffuse outward, so that the bending position of the steel plate bends from the bottom to the top and transmits stress, avoiding stress accumulation caused by continuous bending of the steel plate. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is an overall diagram of the present invention.

[0016] Figure 2 This is a side view of the mold mechanism.

[0017] Figure 3 This is a three-dimensional schematic diagram of a bent structure.

[0018] Figure 4 This is a side view of the force transmission mechanism.

[0019] Figure 5 This is a side view of the stamped structure.

[0020] Figure 6 This is a side view of the formed structure.

[0021] In the diagram: Lower base-1, mold mechanism-2, upper base-3, hydraulic device-4, control panel-5, force transmission mechanism-21, bending structure-22, support plate-23, stamping structure-24, base plate-25, elastic rail-26, recessed groove-101, bending plate-221, hinge block-222, horizontal plate-223, pivot seat-211, lever arm-212, tilting rod-213, first pressure plate-241, forming structure-242, telescopic rod-243, second pressure plate-244, fixing plate-245, spring-2421, arc block-2422, force plate-2423, arc plate-2424. Detailed Implementation

[0022] like Figures 1 to 6 As shown, the present invention proposes a metal stamping device for an automotive metal control arm, including a lower base 1, a mold mechanism 2, an upper base 3, a hydraulic unit 4, and a control panel 5. The mold mechanism 2 is horizontally fixed on the surface of the lower base 1, and the hydraulic unit 4 inside the upper base 3 is vertically corresponding to the surface of the mold mechanism 2. The hydraulic unit 4 is driven to extend and retract by an electrical signal through the control panel 5 on the side of the upper base 3, and the output end of the hydraulic unit 4 is stamped to form the steel plate on the surface of the mold mechanism 2. The mold mechanism 2 is provided with a force transmission mechanism 21, a bending structure 22, a support plate 23, a stamping structure 24, a base plate 25, and an elastic rail 26. The elastic rail 26 moves elastically up and down on the lower side of the stamping structure 24 corresponding to the edge of the support plate 23. The support plate 23 is horizontally fixed to the surface of the lower base 1 through the lower base plate 25. The bending structure 22 provided on the inner side of the support plate 23 guides the bending of the steel plate. The force transmission mechanism 21 supports the bending structure 22 with lever inside the base plate 25. The stamping structure 24 is connected and fixed to the lower end of the hydraulic device 4 and drives the stamping structure 24 to press the steel plate downwards from the middle of the base plate 25 to the left and right sides in sequence.

[0023] Furthermore, the outer side of the support plate 23 is arc-shaped; the elastic rail 26 moves up and down along the outer track of the stamping structure 24. The height of the elastic rail 26 when stationary is lower than the middle position of the stamping structure 24. The upper end of the elastic rail 26 is equipped with a spring rod, which has elastic contraction force. The elastic rail 26 is elastically supported by the spring rod. When stamping in the middle of the steel plate, the steel plate elastically supports the elastic rail 26. Since the arc position at the lower end of the elastic rail 26 is small, the outer side of the steel plate of the elastic rail 26 tends to be horizontal and the elasticity is insufficient to support the bending of the steel plate. When the stamping in the middle of the steel plate is completed, the arc position at the lower end of the elastic rail 26 corresponds to the arc on the outer side of the support plate 23 and presses against each other to bend the steel plate. The steel plate is quickly bent by the elastic rail 26. At this time, the deformation in the middle of the steel plate ends and the elastic rail 26 is at its limit. In the compressed state, the steel plate will diffuse the deformation stress outwards, without affecting the stamped position in the middle of the steel plate; the bottom plate 25 has an elastic stripping mechanism on the edge of its surface, which can make the stamped steel plate elastically push away from the surface of the support plate 23. In this invention, the operator controls the hydraulic device 4 hydraulically via the control panel 5 on the side of the lower base 1, so that the stamping structure 24 hydraulically impacts the steel plate placed on the surface of the support plate 23, and the middle of the stamping structure 24 contacts the steel plate first, thus stamping from the middle of the steel plate to the left and right sides in sequence. With the help of the force transmission mechanism 21 and the bending structure 22, the bending position of the steel plate is stamped outwards in sequence, so that the stress of the stamping deformation of the steel plate diffuses from the middle to the outside in sequence, avoiding uneven stress distribution during hard stamping of the steel plate, and avoiding local overload and deformation fracture of the control arm after stamping.

[0024] The bending structure 22 includes a bending plate 221, a hinge block 222, and a horizontal plate 223. The bending plate 221 hinges and rotates with the hinge block 222, which is fixed inside the support plate 23. The bottom plate 25 has a recessed area in the shape of a groove 101 in the middle. Adjacent bending plates 221 are arranged in a series of arc-shaped or straight-line intervals along the edge of the groove 101. The force transmission mechanism 21 lever supports the horizontal plate 223 at the lower end of the bending plate 221 to keep it horizontal.

[0025] Furthermore, when the horizontal plate 223 rotates to a horizontal state under the lever support of the force transmission mechanism 21, the lowest end of the bent plate 221 is at the same level as the surface of 25; the shape of the recessed groove 101 is a hollow structure formed by straight lines and arcs. The hinge blocks 222 on the straight edge of the recessed groove 101 are arranged in a straight line with gaps, while the bent plates 221 on the arc edge of the recessed groove 101 are distributed through arc gaps. The gaps between the bent plates 221 do not affect the overall stamping deformation of the steel plate and facilitate the movement of adjacent bent plates 221; when the middle of the steel plate deforms, the steel plate will squeeze the bent plate 221. 21. The steel plate drives the bending plate 221 to rotate downward around the hinge block 222. At this time, the steel plate is in an inclined state and gradually changes to a bent state. The stamping ends in the middle of the steel plate, and under the stamping of the stamping structure 24, the force transmission mechanism 21 generates an upward lever force on the bending structure 22. At this time, the upper and lower sides of the steel plate are bent by the bending structure 22 and the stamping structure 24 respectively. Since the stamping structure 24 is vertically downward and first corresponds to the lower side of the bending plate 221, the bottom of the bending position of the steel plate is stamped first. In the state where the stamping in the middle of the steel plate ends and is fixed, the deformation stress of the bending position diffuses outward.

[0026] The force transmission mechanism 21 includes a rotating shaft seat 211, a lever arm 212, and an inclined rod 213. The rotating shaft seat 211 is fixed inside the base plate 25. The right end of the lever arm 212 and the left end of the inclined rod 213 are fixed to the left and right sides of the rotating shaft seat 211. The "L"-shaped lever arm 212 protrudes from the surface of the base plate 25, and the upper end of the inclined rod 213 abuts against the lower end of the horizontal plate 223. The stamping structure 24 stamps the position of the lever arm 212, and the lever arm 212 drives the inclined rod 213 to rotate with the rotating shaft seat 211 as the center lever.

[0027] Furthermore, when the lever arm 212 is in a horizontal state, its uppermost end protrudes from the surface of the base plate 25. At this time, the bending plate 221, under the downward deformation force of the steel plate, drives the horizontal plate 223 to abut against the upper end of the inclined rod 213. When the stamping structure 24 drives the steel plate to press the upper end of the lever arm 212, the lever arm 212 rotates through the pivot seat 211 and drives the inclined rod 213 to press the horizontal plate 223 upward, causing the bending plate 221 to press the lower side of the steel plate upward. Under the downward pressing force of the stamping structure 24, the bottom of the bending position of the steel plate is stamped. Under the movement of the force transmission mechanism 21 and the bending structure 22, when the steel plate is stamped in the middle position, the bending position of the steel plate can deform slowly and provide a path for the middle stress to disperse outward, avoiding the accumulation of deformation stress of the steel plate stamping inside the metal of the steel plate.

[0028] The stamping structure 24 includes a first pressure plate 241, a forming structure 242, a telescopic rod 243, a second pressure plate 244, and a fixed plate 245. The first pressure plate 241 and the second pressure plate 244 are elastically connected to the lower end of the fixed plate 245 via the telescopic rod 243. The forming structure 242 is symmetrically fixed to the lower side of the fixed plate 245. The first pressure plate 241 and the second pressure plate 244 are elastically pressed against the surface of the base plate 25. When the telescopic rod 243 reaches its elastic limit, the first pressure plate 241 and the second pressure plate 244 are at the same level. The outer shape of the forming structure 242 is perpendicularly stamped to the outer shape of the hinge block 222.

[0029] Furthermore, the first pressure plates 241 are arranged in a staggered pattern along the middle of the recessed groove 101; the lower side of the first pressure plate 241 is lower than the second pressure plates 244 on the left and right sides, and the telescopic rod 243 at the upper end of the first pressure plate 241 has a stronger elastic extension force than the telescopic rod 243 at the upper end of the second pressure plate 244. When the first pressure plate 241 elastically compresses the telescopic rod 243, the second pressure plates 244 on the left and right sides gradually correspond to the steel plate being stamped. At this time, the elastic force of the first pressure plate 241 on the steel plate is greater than that of the second pressure plate 244. When the first pressure plate 241 presses the steel plate and contacts the bottom plate 25... When the surface is being pressed, the telescopic rod 243 at the upper end of the first pressure plate 241 continues to compress. When the second pressure plate 244 presses the steel plate and compresses the telescopic rod 243 to its limit, the telescopic rod 243 at the upper end of the first pressure plate 241 is also at its compression limit. At this time, the first pressure plate 241, the second pressure plate 244 and the lower end of the forming structure 242 are at the same level. Thus, the first pressure plate 241 and the second pressure plate 244 slowly press and deform the middle of the steel plate, and the lower end of the forming structure 242 slowly presses the bending position of the steel plate, so that the middle stress can diffuse outward in sequence during slow pressing.

[0030] The forming structure 242 includes a spring 2421, an arc-shaped block 2422, a force-bearing plate 2423, and an arc-shaped plate 2424. The arc-shaped block 2422 is fixed to the lower end of the force-bearing plate 2423. The lower end of the arc-shaped plate 2424 is hinged to the upper end of the arc-shaped block 2422. Three springs 2421 arranged vertically are elastically connected to the side of the force-bearing plate 2423 on the side of the arc-shaped plate 2424. When the springs 2421 are compressed to their limit, the upper end of the arc-shaped plate 2424 presses against the side of the force-bearing plate 2423. The bottom of the steel plate at the bending position is elastically bent corresponding to the arc-shaped plate 2424 under the elasticity of the bending plate 221.

[0031] Furthermore, when the arc-shaped block 2422 is pressed downwards to correspond to the steel plate, the spring 2421 is in a stationary state, and the arc-shaped plate 2424 is rotating downwards under the elasticity of the spring 2421. The bent plate 221 has not returned to the required shape of the steel plate, and the forming structure 242 has not completely brought the upper end of the power arm 212 to a horizontal state. Therefore, there is still a bending space between the lower side of the bent plate 221 and the lower end of the arc-shaped block 2422. In this invention, when the lever arm 212 supports the bent plate 221 to the required bending shape, the bottom of the bent position of the steel plate is subjected to final stamping deformation while the deformation in the middle of the steel plate is completed. When the bottom of the steel plate is stamped at the bending position, the upper part of the bending position is also slowly pressed by the arc plate 2424 from the inclined to the arc bending state, gradually dispersing the stress and reducing the deformation stress of the final stamping and bending. Since the stamping structure 24 is a downward vertical stamping, the arc block 2422 will first stamp the bottom of the bending position of the steel plate. At this time, the bending force at the bottom of the bending position is greater than that at the top. The stress of the steel plate will diffuse to the upper part of the bending position and diffuse outward under the slow bending at the top. This makes the bending position of the steel plate bend from the bottom to the top and transfer the stress, avoiding the stress accumulation caused by continuous bending of the steel plate.

[0032] A metal stamping method for an automotive metal control arm, based on the aforementioned metal stamping device for an automotive metal control arm, specifically includes the following steps: S1: Intermediate stamping: The steel plate is placed on the surface of the support plate 23, and the stamping structure 24 at the lower end of the hydraulic device 4 is driven by the control panel 5 to move downward hydraulically, so that the first pressure plate 241 in the stamping structure 24 corresponds to the steel plate for stamping. The first pressure plate 241 and the second pressure plate 244 are stamped from the middle to the left and right sides in sequence, so that the metal deformation effect of the steel plate is dispersed from the middle to the outer sides.

[0033] S2: First bending: When the steel plate is stamped in the middle, the bending position of the steel plate is tilted under the obstruction of the bending plate 221. Then, during the process of the second pressure plate 244 driving the upper end of the steel plate extrusion lever 212, the lever 212 drives the tilting rod 213 to support the horizontal plate 223. Thus, the horizontal plate 223 supports the bending plate 221 to rotate in the direction corresponding to the lower side of the steel plate, and causes the bending plate 221 and the forming structure 242 to generate mutual stamping deformation at the bending position of the steel plate.

[0034] S3: Second bending: When the steel plate is bent along the bending plate 221, the outer side of the forming structure 242 corresponds to the bending surface of the inner side of the bending plate 221, which moves elastically. At this time, the arc plate 2424 is driven by the steel plate to compress the spring 2421, and the arc block 2422 presses the steel plate to the lower side of the bending plate 221 for stamping.

[0035] S4: Third bending stamping: When the arc block 2422 presses the bottom of the steel plate at the bending position, the stress of the steel plate diffuses outward. At this time, the elasticity of the arc plate 2424 rotates under the obstruction of the steel plate and compresses the spring 2421, so that the steel plate slowly bends along the corresponding shape of the arc plate 2424 and the bending plate 221 and diffuses the stress outward.

[0036] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A metal stamping device for an automotive metal control arm, characterized in that, It includes a lower base, a mold mechanism, an upper base, a hydraulic press, and a control panel. The mold mechanism is horizontally fixed on the surface of the lower base, and the hydraulic press inside the upper base is vertically aligned with the surface of the mold mechanism. The hydraulic press is driven to extend and retract by an electrical signal from the control panel on the side of the upper base, and the output end of the hydraulic press is used to stamp the steel plate on the surface of the mold mechanism. The mold mechanism includes a force transmission mechanism, a bending structure, a support plate, a stamping structure, a base plate, and an elastic rail. The elastic rail moves elastically up and down on the lower side of the stamping structure corresponding to the edge of the support plate. The support plate is horizontally fixed to the surface of the lower base plate through the lower base plate. The bending structure provided on the inner side of the support plate guides the bending of the steel plate. The force transmission mechanism supports the bending structure with levers inside the base plate. The stamping structure is connected and fixed to the lower end of the hydraulic device and drives the stamping structure to stamp the steel plate downwards from the middle of the base plate to the left and right sides in sequence. The bending structure includes a bending plate, a hinge block, and a horizontal plate. The bending plate and the hinge block fixed inside the support plate rotate together. The bottom plate has a recessed area in the shape of an indentation groove in the middle. Adjacent bending plates are arranged in a series of arc-shaped or straight-line intervals along the edge of the indentation groove. The force transmission mechanism lever supports the horizontal plate at the lower end of the bending plate to keep it horizontal. The stamping structure includes a first pressure plate, a forming structure, a telescopic rod, a second pressure plate, and a fixed plate. The first pressure plate and the second pressure plate are elastically connected to the lower end of the fixed plate through the telescopic rod. The forming structure is symmetrically fixed to the lower side of the fixed plate. The first pressure plate and the second pressure plate are elastically pressed against the corresponding bottom plate surfaces. When the telescopic rod reaches its elastic limit, the first pressure plate and the second pressure plate are at the same level. The outer side of the forming structure is perpendicularly stamped to the shape of the outer side of the hinge block.

2. The metal stamping device for an automotive metal control arm according to claim 1, characterized in that, The force transmission mechanism includes a rotating shaft seat, a lever arm, and an inclined rod. The rotating shaft seat is fixed inside the base plate. The right end of the lever arm and the left end of the inclined rod are fixed on the left and right sides of the rotating shaft seat. The "L"-shaped lever arm protrudes from the surface of the base plate, and the upper end of the inclined rod abuts against the lower end of the horizontal plate. The stamping structure stamps the position of the lever arm and causes the lever arm to drive the inclined rod to rotate around the rotating shaft seat as a lever.

3. The metal stamping device for an automotive metal control arm according to claim 2, characterized in that, The forming structure includes a spring, an arc-shaped block, a force-bearing plate, and an arc plate. The arc-shaped block is fixed to the lower end of the force-bearing plate, and the lower end of the arc plate rotates on the upper end of the arc-shaped block via a hinge. Three springs arranged vertically on the side of the arc plate are elastically connected to the side of the force-bearing plate. When the springs are compressed to their limit, the upper end of the arc plate presses against the side of the force-bearing plate. The bottom of the steel plate at the bending position is elastically bent by the arc plate under the elasticity of the bending plate.

4. A metal stamping method for an automotive metal control arm, based on the metal stamping apparatus for an automotive metal control arm as described in claim 3, characterized in that, The specific stamping method is as follows: S1: Intermediate stamping: The steel plate is placed on the surface of the support plate, and the stamping structure at the lower end of the hydraulic device is driven by the control panel to move downward hydraulically. Thus, the first pressure plate in the stamping structure is corresponding to the steel plate for stamping. The first pressure plate and the second pressure plate are used to stamp from the middle to the left and right sides in sequence, so that the metal deformation effect of the steel plate is dispersed from the middle to the outer sides. S2: First bend: When the steel plate is stamped in the middle, the bending position of the steel plate is inclined under the obstruction of the bending plate. Then, during the process of the second pressure plate driving the steel plate to press the upper end of the force arm, the force arm drives the inclined lever to support the horizontal plate. Thus, the horizontal plate supports the bending plate to rotate in the direction corresponding to the lower side of the steel plate, and causes the bending plate and the forming structure to produce mutual stamping deformation at the bending position of the steel plate. S3: Second bend: When the steel plate is bent along the deformation of the bending plate during stamping, the outer side of the forming structure corresponds to the inner side of the bending plate, which moves elastically. At this time, the arc plate is driven by the steel plate to compress the spring, and the arc block presses the steel plate against the lower side of the bending plate for stamping. S4: Third bending stamping: When the arc-shaped block presses the bottom of the steel plate at the bending position, the stress of the steel plate diffuses outward. At this time, the elasticity of the arc-shaped plate rotates under the obstruction of the steel plate and compresses the spring, causing the steel plate to slowly bend along the corresponding shape of the arc-shaped plate and the bending plate and diffuse the stress outward.

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