Multi-station continuous stamping device and method for automobile exhaust valve body support

Abstract

The invention discloses a multi-station continuous stamping device and method for an automobile exhaust valve body support. The multi-station continuous stamping device comprises a multi-station continuous stamping die, and the die comprises a guide hole stamping station, an edge cutting station, a punching station, a bending station and a fine stamping separation station; the trimming station is used for trimming and blanking; the punching station is used for punching a special-shaped hole in the part blank; the bending station comprises two stages of bending stations: the first stage of bending station is a tearing bending station and is used for carrying out tearing bending on a structural part protruding out of the side of the part blank to form a tearing part; and the second-stage bending station is a forming and bending station and is used for forming and bending the tearing part to form the arc side hook. According to the continuous stamping die and process integrating multiple stations, two-stage bending of opening tearing and forming is adopted, and side shaping is assisted, so that the problem of poor one-time forming precision of arc side hooks and other high-difficulty characteristics in complex parts of an automobile exhaust system is solved, and high-precision and automatic continuous production of the parts is achieved.

Description

Technical Field

[0001] This invention belongs to the field of automotive exhaust system component processing technology, and particularly relates to a multi-station continuous stamping device and method for automotive exhaust valve body bracket. Background Technology

[0002] like Figure 1 The image shows an automotive exhaust valve body bracket, which has a complex three-dimensional structure combining a main planar surface with local hooks and a bracket. It requires extremely high precision in installation dimensions, angles, and form, as this precision directly affects the valve's closed-loop control performance. Traditional manufacturing processes often employ multiple sets of single-stage molds for decentralized processing, resulting in slow production cycles, large footprints, and poor product consistency due to accumulated errors in inter-process transfer and positioning. Furthermore, using conventional multi-station continuous dies often fails to achieve high-precision forming in a single bending stage for features such as "arc side hooks" requiring large angles and irregular trajectories. This leads to defects such as large springback and shape discrepancies, failing to meet the stringent requirements for high precision and reliability in valve body bracket parts, becoming a technical bottleneck restricting their efficient and precise continuous stamping forming. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a multi-station continuous stamping device and method for automotive exhaust valve body bracket. By integrating multi-station continuous stamping molds and processes, adopting a two-stage bending process of tearing first and then forming, and supplemented by side shaping, the invention solves the problem of poor one-time forming accuracy of high-difficulty features such as arc side hooks in complex automotive exhaust system parts, and realizes high-precision and automated continuous production of such parts.

[0004] Technical solution: To achieve the above objectives, the present invention provides a multi-station continuous stamping device for an automotive exhaust valve body bracket, comprising a multi-station continuous stamping die, wherein the multi-station continuous stamping die includes a punching guide hole station, a trimming station, a punching station, a bending station, and a fine stamping separation station integrated along the feeding direction of the material strip.

[0005] The punching guide hole station is used to punch a pair of symmetrical guide holes on the strip to establish an initial positioning reference, and to perform precise positioning in subsequent stations by using corresponding guide pins.

[0006] The edge trimming station is used to trim and punch the strip to form a part blank that is connected to the strip skeleton by a process structure bridge. During the feeding process, the process structure bridge bears the transmission force.

[0007] The punching station is used to punch irregular holes in the part blank;

[0008] The bending station includes two-stage bending stations: the first-stage bending station is a tearing bending station, which is used to tear and bend the structural parts that protrude from the side of the part blank, so that they are misaligned with the main plane of the part blank and form a tear; the second-stage bending station is a forming bending station, which is used to form the tear to form an arc side hook.

[0009] The fine blanking separation station is used to cut the process structure bridge to unload the final formed part from the strip skeleton and remove the remaining waste.

[0010] Furthermore, the multi-station continuous stamping die includes an upper die structure and a lower die structure. When the upper die structure moves down and closes with the lower die structure, the punching and guiding hole station, trimming station, punching station, bending station, and fine blanking station perform the punching and guiding hole process, trimming process, punching process, bending process, and fine blanking separation process.

[0011] Furthermore, the tear portion includes a curved section connecting the part blank and a straight section connecting the curved section; at the forming and bending station, the straight section is formed and bent with an arc trajectory deformation, thereby constructing the tear portion into an arc side hook.

[0012] Furthermore, the tearing bending station is equipped with upper and lower corresponding tearing bending punches and tearing bending dies. The tearing bending punch is installed on the upper die structure, and the tearing bending die is formed on the lower die structure. When the die is closed, the tearing bending punch presses down on the structural part protruding from the side of the part blank and tears it, and the tearing bending die supports it from the bottom to form the tear.

[0013] Furthermore, the forming and bending station is equipped with upper and lower corresponding forming and bending punches and forming and bending dies. The forming and bending punch is installed on the upper die structure, and the forming and bending die is formed on the lower die structure. When the die is closed, the forming and bending punch presses down on the straight section of the torn part, and in conjunction with the forming and bending die supporting the straight section, the straight section is bent in an upward arc trajectory to form the arc side hook.

[0014] Furthermore, it also includes a side-shaping station for side-shaping the arc-shaped side hook; the side-shaping station for arc-shaped side hook includes a filling punch and a shaping side block disposed on the upper mold structure; when the mold is closed, the filling punch moves down and fits into the inner space of the arc-shaped side hook to provide internal support for the arc-shaped side hook, and the shaping side block squeezes the arc-shaped side hook from the outside through the horizontal component of the downward pressure during the downward movement of the arc-shaped side block to perform side-shaping of the arc-shaped side hook.

[0015] Furthermore, the guide pins are disposed on the upper mold structure and correspond one-to-one with the guide holes on the material strip, and a plurality of the guide pins are evenly distributed at intervals on the feeding path of the material strip.

[0016] The punching guide hole station is equipped with a punching guide hole punch installed on the upper die structure;

[0017] The trimming station includes a first trimming station, a second trimming station and a third trimming station, and each trimming station is respectively provided with a trimming punch installed on the upper die structure to perform punching and trimming operations on the part blank.

[0018] The punching station includes a first punching station, a second punching station and a third punching station, and each punching station is respectively provided with a special-shaped punch installed on the upper die structure to punch out T-shaped holes, rectangular holes and support grooves in sequence on the part blank.

[0019] Furthermore, the bending station also includes an end bending station for simultaneously bending the structural parts where the support grooves are located at both ends of the part blank to form a pair of symmetrical supports. The end bending station is provided with an end bending punch installed on the upper die structure and an end bending die formed on the lower die structure. After the bending station and before the fine blanking separation station, a support side forming station is provided for side forming of the supports. The support side forming station is provided with a side forming die formed on the lower die structure.

[0020] Furthermore, the fine blanking separation station includes a blanking station and a cutting station;

[0021] The blanking station is equipped with a blanking punch installed on the upper die structure and a blanking channel formed on the lower die structure;

[0022] The cutting station is equipped with an upper cutting blade block installed on the upper mold structure and a lower cutting blade block installed on the lower mold structure. The lower mold structure has a feeding guide channel at the beginning and a waste material sliding channel at the end.

[0023] A stamping method for a multi-station continuous stamping device for an automotive exhaust valve body bracket includes the following steps:

[0024] S1. Punching guide holes: The strip is fed into the mold from the feeding guide channel, and a pair of symmetrical guide holes are punched at the punching guide hole station to establish a positioning benchmark for the whole process.

[0025] S2, Edge trimming: The material strip is conveyed to the edge trimming station for contour punching, forming a part blank connected to the material strip skeleton by a process structure bridge. The process structure bridge bears the transmission force in subsequent feeding.

[0026] S3, Punching: The part blank is conveyed to the punching station by stepping, and multiple irregular holes are punched out in the main plane area in sequence, including T-shaped holes, rectangular holes and support grooves;

[0027] S4. Two-stage bending forms an arc-shaped side hook:

[0028] S4.1, Tear bending: The part blank is conveyed to the tear bending station. The tear bending punch and tear bending die cooperate to press down and tear the protruding part on the side of the blank, forming a tear part that is misaligned with the main plane.

[0029] S4.2 Forming and Bending: The blank with the tear is conveyed to the forming and bending station. The forming and bending punch and the forming and bending die cooperate to bend the straight section of the tear into an upward arc trajectory to form an arc side hook.

[0030] S5, Side Shaping: The blank with the arc side hook is conveyed to the arc side hook side shaping station. The filling punch is embedded in the hook cavity for support, and at the same time, the shaping side block applies a horizontal shaping force from the outside to accurately calibrate the shape and size of the arc side hook.

[0031] S6. End bending and shaping:

[0032] S6.1 End bending: The billet is transported to the end bending station, and the parts where the support grooves are located at both ends of the billet are bent simultaneously to form a pair of symmetrical supports.

[0033] S6.2, Side forming of bracket: The blank is transported to the side forming station of the bracket, and the bracket is laterally formed by the side forming die to ensure its angle and dimensional accuracy;

[0034] S7, Fine Blanking Separation: The final formed blank is conveyed to the fine blanking separation station.

[0035] S7.1 Blanking: The blanking punch cuts off all process structure bridges, allowing the formed parts to detach from the strip skeleton through the blanking channel;

[0036] S7.2 Scrap cutting: The upper and lower cutting blades work together to cut off the remaining scrap after it has been dropped, and the scrap is discharged through the scrap sliding channel.

[0037] Starting from step S2, the material conveying and positioning of each step are precisely positioned by the guide pin corresponding to the station and the guide hole formed in step S1, so as to realize continuous synchronous stamping of multiple stations.

[0038] Beneficial effects: This invention adopts multi-station common mold continuous stamping, integrating traditional scattered processes and significantly improving production efficiency and automation level; especially for complex arc side hook structures, it creatively adopts a two-stage progressive forming process of "tear bending and forming bending", combined with the side shaping station that combines internal and external processes, successfully solving the industry problem of large springback and poor precision in one-time forming of this type of feature, and significantly improving its shape and dimensional stability; at the same time, the step-by-step edge cutting and punching design optimizes the mold stress and extends the mold life, while the fine blanking separation station cuts and separates the blanking part from the scrap, ensuring the final separation quality of the part. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the parts processed by the multi-station continuous stamping device of the present invention;

[0040] Figure 2 This is a schematic diagram of the lower die structure of a multi-station continuous stamping device;

[0041] Figure 2-1 for Figure 2 Enlarged structural diagram of region A in the middle;

[0042] Figure 2-2 for Figure 2 Enlarged structural diagram of region B in the middle;

[0043] Figure 2-3 for Figure 2 Enlarged structural diagram of region C in the middle;

[0044] Figure 2-4 for Figure 2 Enlarged structural diagram of region E in the middle;

[0045] Figure 2-5 for Figure 2 Enlarged structural diagram of region F in the middle;

[0046] Figure 2-6 for Figure 2 Enlarged structural diagram of region G in the middle;

[0047] Figure 2-7 for Figure 2 Enlarged structural diagram of region H in the middle;

[0048] Figure 3 This is a schematic diagram of the upper die structure of a multi-station continuous stamping device;

[0049] Figure 3-1 for Figure 3 Enlarged structural diagram of region I;

[0050] Figure 3-2 for Figure 3Enlarged structural diagram of region J in the middle;

[0051] Figure 3-3 for Figure 3 Enlarged structural diagram of region K in the middle;

[0052] Figure 3-4 for Figure 3 Enlarged structural diagram of region L in the middle;

[0053] Figure 3-5 for Figure 3 Enlarged structural diagram of region M in the middle;

[0054] Figure 3-6 for Figure 3 Enlarged structural diagram of region N in the middle;

[0055] Figure 3-7 for Figure 3 Enlarged structural diagram of the O region;

[0056] Figure 3-8 for Figure 3 A magnified schematic diagram of the structure of region P in the middle. Detailed Implementation

[0057] The invention will now be further described with reference to the accompanying drawings.

[0058] like Figure 1 , Figure 2 and Figure 3 As shown, a multi-station continuous stamping device for an automotive exhaust valve body bracket includes a multi-station continuous stamping die. This die comprises a punching guide hole station 1, a trimming station 2, a punching station 3, a bending station 4, and a fine blanking separation station 5, all integrated along the feeding direction of the strip 10. More specifically, the multi-station continuous stamping die includes an upper die structure U and a lower die structure D. When the upper die structure U moves down to close with the lower die structure D, the punching guide hole station 1, trimming station 2, punching station 3, bending station 4, and fine blanking station 5 perform the punching guide hole process, trimming process, punching process, bending process, and fine blanking separation process. This "common die setup" means that all processes are completed simultaneously in different areas of the die during a single stamping stroke, achieving fully automated and continuous production from the strip to the finished part. This fundamentally differs from the multiple handling, positioning, and stamping operations required by traditional single-process die production, greatly improving production efficiency and automation levels.

[0059] like Figure 2 , Figure 2-1 , Figure 3 and Figure 3-2As shown, the punching guide hole station 1 is used to punch a pair of symmetrical guide holes 10a on the strip 10 to establish an initial positioning reference, and to achieve precise positioning in subsequent stations through the cooperation of corresponding guide pins 11. More specifically, as... Figure 2-1 and Figure 3-1 As shown, the guide pins 11 are disposed on the upper die structure U and correspond one-to-one with the guide holes 10a on the strip 10, and a plurality of the guide pins 11 are evenly distributed at intervals along the feeding path of the strip 10. The guide hole punching station 1 is provided with a guide hole punching punch 1.1 mounted on the upper die structure U. The guide hole punching station 1 is the "datum establishment" stage of precision continuous stamping. The positional accuracy of the guide holes 10a directly determines the cumulative error of all subsequent processes. Its symmetrical design ensures the positioning balance of the strip 10 in the width direction, providing a high-precision, reusable geometric positioning datum for the entire continuous stamping process, and ensuring the realization of subsequent high-precision processing.

[0060] like Figure 2 and Figure 3 As shown, the trimming station 2 is used to trim and punch the strip 10 to form a part blank connected to the strip skeleton by a process structure bridge, and the process structure bridge bears the transmission force during the feeding process. More specifically, as Figure 2 , Figure 3 and Figure 3-2 As shown, the trimming station 2 includes a first trimming station 2.1, a second trimming station 2.2, and a third trimming station 2.3, and each trimming station 2 is respectively equipped with a trimming punch 21 mounted on the upper die structure U to perform punching and trimming operations on the part blank. Step-by-step trimming decomposes the complex outer contour of the part into multiple simple punching segments, significantly reducing the perimeter and punching force of a single punching, which is beneficial to improving the local strength of the die and reducing wear and vibration. The retained process structure bridge bears all the traction and transmission force during the feeding process, ensuring that the blank can move stably before complete separation, and can be cleanly cut off at the last station, ensuring the quality of the blank contour while realizing the reliable carrying and transmission of the blank within the die.

[0061] like Figure 2 and Figure 3 As shown, the punching station 3 is used to punch irregularly shaped holes in the part blank. More specifically, the punching station 3 includes a first punching station 3.1, a second punching station 3.2, and a third punching station 3.3, as follows: Figure 3-3 As shown, each of the punching stations 3 is respectively equipped with a shaped punch 31 mounted on the upper die structure U, so as to punch out T-shaped holes 101, rectangular holes 102 and support grooves 103 in sequence on the part blank. Figure 1 As shown, the irregular holes are: T-shaped hole 101, rectangular hole 102 and support groove 103.

[0062] like Figure 2 and Figure 3 As shown, the bending station 4 includes a two-stage bending station: the first-stage bending station is a tearing bending station 4.1, used to tear and bend the structural parts protruding from the edge of the part blank, making them misaligned with the main plane of the part blank and forming a tear 6.5. More specifically, as... Figure 2-2 and Figure 3-4 As shown, the tear portion 6.5 includes a bent section 6.5a connecting the part blank and a straight section 6.5b connecting the bent section 6.5a. At the forming and bending station 4.2, the straight section 6.5b is formed and bent with an arc trajectory deformation, thereby constructing the tear portion 6.5 into an arc-shaped side hook 6. Furthermore, the tear bending station 4.1 is provided with upper and lower corresponding tear bending punches 4.11 and tear bending dies 4.12. The tear bending punch 4.11 is mounted on the upper die structure U, and the tear bending die 4.12 is formed on the lower die structure D. When the mold is closed, the tear bending punch 4.11 presses down on the structural part protruding from the side of the part blank and tears it, while the tear bending die 4.12 supports it from the bottom, forming the tear portion 6.5. This process is a preparatory step for forming the complex arc-shaped side hook 6. The principle lies in using a "tear" rather than a "cut" method to partially separate the material from the main body and create a preliminary bend (forming the bent section 6.5a) and a straight extension (the straight section 6.5b). This creates an ideal "preform" for the forming and bending in the next station, thus avoiding the extremely high material flow resistance and uncontrollable springback caused by directly forming large-angle, small-arc shapes from a flat blank in one step, breaking down the problem.

[0063] like Figure 2 and Figure 3 As shown, the second-stage bending station is the forming bending station 4.2, used to form and bend the torn part 6.5 to create the arc-shaped side hook 6. More specifically, as... Figure 2-3 and Figure 3-5As shown, the forming and bending station 4.2 is equipped with upper and lower corresponding forming and bending punches 4.21 and forming and bending dies 4.22. The forming and bending punches 4.21 are mounted on the upper die structure U, and the forming and bending dies 4.22 are formed on the lower die structure D. When the mold is closed, the forming and bending punches 4.21 press down on the straight section 6.5b of the tear portion 6.5, and the forming and bending dies 4.22 support the straight section 6.5b, causing the straight section 6.5b to bend upwards in an arc-shaped trajectory, forming the arc-shaped side hook 6. This process focuses on the precise plastic forming of the pre-made straight section 6.5b. Because the deformation area is clearly defined and separated from the main plane, the material deformation resistance is relatively reduced, and the springback trend is easier to predict and control. The precise arc-shaped surfaces of the punches and dies ensure the accuracy of the bending trajectory. The two-stage bending method significantly improved the forming accuracy and consistency of the complex spatial structure of the arc side hook 6, and reduced the scrap rate.

[0064] The design of the bending station 4 in this invention creatively addresses the characteristics of the "arc side hook 6" on the automotive exhaust valve body bracket, which combines large angles, spatial curvature, and high precision requirements. Traditional progressive die designs often attempt to force forming in a single station through complex mold cavities, resulting in excessive material thinning, uncontrolled springback, and even cracking. This invention breaks away from this mindset, employing a two-stage progressive bending process of "tear pre-separation - forming and finishing." Its core design concept is to decompose a difficult overall plastic deformation into first controlling the tearing and preliminary positioning of local materials (tear bending), and then performing directional and precise trajectory forming on the separated, more geometrically regular local parts (forming bending).

[0065] The innovation of this process lies in the following: First, the tear-bending is not a simple cut or slit, but rather, through the specific cooperation of the punch and die, the material is torn under controlled conditions, naturally forming a "preform" (tear section 6.5) with curved and straight sections. This step cleverly transforms a portion of the complex three-dimensional shape required for subsequent forming into a more easily achievable two-dimensional separation and micro-bending, and pre-releases some internal stress. Subsequently, the forming bending focuses on the precise arc forming of the straight section of the preform. Since the deformation area has been locally isolated from the overall blank and has a clear guiding geometry, the material flow resistance is significantly reduced, and the springback path becomes predictable and controllable. A perfect pre-treatment and finishing process is formed between the two stages. This process decomposition not only significantly improves the dimensional accuracy and consistency of the final arc side hook 6, but also enhances the forming capability of high-strength materials by reducing the difficulty of single deformation, and improves die life and process stability.

[0066] like Figure 2 and Figure 3As shown, the present invention also includes an arc-shaped side hook side shaping station 7 for side shaping of the arc-shaped side hook 6. More specifically, as... Figure 3-6 As shown, the arc-shaped side hook shaping station 7 includes a filling punch 71 and a shaping side block 72 disposed on the upper mold structure U. During mold closing, the filling punch 71 descends and engages with the inner space of the arc-shaped side hook 6 to provide internal support for the arc-shaped side hook 6. During the downward movement of the shaping side block 72, the horizontal component of the downward pressure squeezes the arc-shaped side hook 6 from the outside to perform side shaping. This station is an active correction measure for the springback of bent parts. The filling punch 71 "holds back" the springback trend from the inside, stabilizing the shape of the hook cavity; the shaping side block 72 performs "micro-forging" from the outside, eliminating local unevenness and calibrating the overall contour. The combined internal and external shaping method can efficiently and significantly reduce the size and shape springback of the arc-shaped side hook 6, ensuring accuracy.

[0067] like Figure 2 and Figure 3 As shown, the bending station 4 also includes an end bending station 4.3 for simultaneously bending the structural parts where the support grooves 103 are located at both ends of the part blank to form a pair of symmetrical supports 8. More specifically, as Figure 2-4 and Figure 3-7 As shown, the end bending station 4.3 is provided with an end bending punch 4.31 mounted on the upper die structure U and an end bending die 4.32 formed on the lower die structure D.

[0068] In addition, such as Figure 2 and Figure 3 As shown, after the bending station 4 and before the fine blanking separation station 5, a bracket side forming station 9 is provided for side forming of the bracket 8, as follows: Figure 2-5 As shown, the bracket side forming station 9 is provided with a side forming die 91 formed on the lower die structure D. This station is specifically used to correct any angular deviations or side deformations that may occur after the bracket 8 is bent.

[0069] The fine blanking separation station 5 is used to cut the process structure bridge to unload the final-shaped part from the strip skeleton and remove any remaining waste. More specifically, such as Figure 2 and Figure 3 As shown, the fine blanking separation station 5 includes a blanking station 5.1 and a cutting station 5.2. Figure 2-6 and Figure 3-8 As shown, the blanking station 5.1 is equipped with a blanking punch 5.11 mounted on the upper die structure U and a blanking channel 5.12 formed on the lower die structure D. Figure 2-7 , Figure 2 and Figure 3As shown, the cutting station 5.2 is equipped with an upper cutting blade 5.21 mounted on the upper die structure U and a lower cutting blade 5.22 mounted on the lower die structure D. The lower die structure D has a feed guide channel 15 at its first end and a waste material discharge channel 16 at its last end. The blanking punch 5.11 precisely cuts all the process structure bridges connecting the parts and the strip skeleton, allowing the final formed automotive exhaust valve body bracket parts to fall into the blanking channel 5.12 by gravity for collection. This step separates the qualified parts without damage. Subsequently, the upper and lower cutting blades cut the remaining waste skeleton of the separated parts, allowing it to be discharged through the waste material discharge channel 16. The advantage of process separation is that it avoids interference between the blanking force and the waste material cutting force, ensuring that the parts are not twisted or strained at the final moment of separation, while also ensuring orderly waste material handling.

[0070] A stamping method for a multi-station continuous stamping device for an automotive exhaust valve body bracket includes the following steps:

[0071] S1. Punching guide holes: The material strip 10 is fed into the mold from the feeding guide channel 15, and a pair of symmetrical guide holes 10a are punched out at the punching guide hole station 1 to establish the positioning benchmark for the whole process.

[0072] S2, Edge Trimming: The material strip is conveyed to the edge trimming station 2 in 10 steps for contour punching, forming a part blank connected to the material strip skeleton by a process structure bridge. The process structure bridge bears the transmission force in subsequent feeding.

[0073] S3, Punching: The part blank is conveyed to the punching station 3 by stepping, and multiple irregular holes are punched out in the main plane area, including T-shaped holes 101, rectangular holes 102 and support grooves 103.

[0074] S4. Two-stage bending forms an arc-shaped side hook 6:

[0075] S4.1, Tear bending: The part blank is conveyed to the tear bending station 4.1. The tear bending punch 4.11 and tear bending die 4.12 cooperate to press down and tear the protruding part on the side of the blank, forming a tear part 6.5 that is misaligned with the main plane.

[0076] S4.2 Forming and bending: The blank with the tear 6.5 is conveyed to the forming and bending station 4.2. The forming and bending punch 4.21 and the forming and bending die 4.22 cooperate to bend the straight section 6.5b of the tear 6.5 in an upward arc trajectory to form an arc side hook 6.

[0077] S5, Side Shaping: The blank with the arc side hook 6 is conveyed to the arc side hook side shaping station 7. The filling punch 71 is embedded in the hook cavity for support. At the same time, the shaping side block 72 applies a horizontal shaping force from the outside to accurately calibrate the shape and size of the arc side hook 6.

[0078] S6. End bending and shaping:

[0079] S6.1 End bending: The billet is transported to the end bending station 4.3, and the parts where the support grooves 103 are located at both ends of the billet are bent synchronously to form a pair of symmetrical supports 8.

[0080] S6.2, Side forming of bracket: The blank is transported to the side forming station 9 of the bracket, and the bracket 8 is side-formed by the side forming die 91 to ensure its angle and dimensional accuracy.

[0081] S7, Fine Blanking Separation: The final formed blank is conveyed to fine blanking separation station 5.

[0082] S7.1 Blanking: The blanking punch 5.11 cuts off all process structure bridges, allowing the formed part to detach from the strip skeleton through the blanking channel 5.12.

[0083] S7.2 Scrap cutting: The upper cutting blade 5.21 and the lower cutting blade 5.22 work together to cut off the remaining scrap after it is dropped, and the scrap is discharged through the scrap sliding channel 16.

[0084] Starting from step S2, the conveying and positioning of the material strip 10 in each step is precisely positioned by the guide pin 11 corresponding to the station and the guide hole 10a formed in step S1, so as to realize continuous synchronous stamping of multiple stations.

[0085] This invention achieves efficient and high-precision continuous production of automotive exhaust valve body brackets through station integration and process design. Its advantages include: employing multi-station common mold continuous stamping, integrating traditionally dispersed processes, significantly improving production efficiency and automation; effectively controlling cumulative errors through a precision positioning system of guide holes and guide pins throughout the entire process, ensuring high consistency in part hole positions and shapes; particularly for complex arc-shaped side hook structures, it creatively adopts a two-stage progressive forming process of "tear-out bending and forming bending," combined with an internal and external side forming station, successfully solving the industry problem of large springback and poor precision in one-time forming of this type of feature, significantly improving its shape and dimensional stability; simultaneously, the step-by-step trimming and punching design optimizes mold stress and extends mold life, while the fine blanking separation station cuts and separates part blanks and scrap, ensuring the final separation quality of the parts.

[0086] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-station continuous stamping device for an automotive exhaust valve body bracket, characterized in that: The multi-station continuous stamping die includes a punching guide hole station (1), a trimming station (2), a punching station (3), a bending station (4), and a fine blanking separation station (5) integrated along the feeding direction of the strip (10). The punching guide hole station (1) is used to punch out a pair of symmetrical guide holes (10a) on the strip (10) to establish an initial positioning reference, and to perform precise positioning in subsequent stations by cooperating with the corresponding guide pins (11). The cutting station (2) is used to cut and punch the strip (10) to form a part blank connected to the strip skeleton by a process structure bridge, and the process structure bridge bears the transmission force during the feeding process. The punching station (3) is used to punch irregular holes in the part blank; The bending station (4) includes two-stage bending stations: the first-stage bending station is a tearing bending station (4.1), which is used to tear and bend the structural part protruding from the side of the part blank, so that it is misaligned with the main plane of the part blank and forms a tear (6.5); the second-stage bending station is a forming bending station (4.2), which is used to form the tear (6.5) to form an arc side hook (6). The fine blanking separation station (5) is used to cut the process structure bridge to drop the final formed part from the strip skeleton and remove the remaining waste.

2. The multi-station continuous stamping device for an automotive exhaust valve body bracket according to claim 1, characterized in that: The multi-station continuous stamping die includes an upper die structure (U) and a lower die structure (D). When the upper die structure (U) moves down and closes with the lower die structure (D), the punching and guiding hole station (1), the trimming station (2), the punching station (3), the bending station (4), and the fine blanking station (5) are used to perform the punching and guiding hole process, the trimming process, the punching process, the bending process, and the fine blanking separation process.

3. The multi-station continuous stamping device for an automotive exhaust valve body bracket according to claim 2, characterized in that: The tear (6.5) includes a curved section (6.5a) connecting the part blank and a straight section (6.5b) connecting the curved section (6.5a); at the forming and bending station (4.2), the straight section (6.5b) is formed and bent with an arc trajectory deformation, thereby constructing the tear (6.5) into an arc side hook (6).

4. The multi-station continuous stamping device for an automotive exhaust valve body bracket according to claim 3, characterized in that: The tearing bending station (4.1) is equipped with upper and lower corresponding tearing bending punches (4.11) and tearing bending dies (4.12). The tearing bending punch (4.11) is installed on the upper die structure (U), and the tearing bending die (4.12) is formed on the lower die structure (D). When the die is closed, the tearing bending punch (4.11) presses down on the structural part protruding from the side of the part blank and tears it, and the tearing bending die (4.12) supports it from the bottom to form the tear part (6.5).

5. The multi-station continuous stamping device for an automotive exhaust valve body bracket according to claim 4, characterized in that: The forming and bending station (4.2) is provided with upper and lower corresponding forming and bending punches (4.21) and forming and bending dies (4.22). The forming and bending punches (4.21) are installed on the upper die structure (U), and the forming and bending dies (4.22) are formed on the lower die structure (D). When the mold is closed, the forming and bending punches (4.21) press down on the straight section (6.5b) of the tear part (6.5), and in conjunction with the forming and bending dies (4.22) supporting the straight section (6.5b), the straight section (6.5b) is bent in an upward arc trajectory, forming the arc side hook (6).

6. The multi-station continuous stamping device for an automotive exhaust valve body bracket according to claim 5, characterized in that: It also includes a side-shaping station (7) for side-shaping the arc side hook (6); the side-shaping station (7) includes a filling punch (71) and a shaping side block (72) set on the upper mold structure (U); when the mold is closed, the filling punch (71) moves down and fits into the inner space of the arc side hook (6) to provide internal support for the arc side hook (6), and the shaping side block (72) squeezes the arc side hook (6) from the outside through the horizontal component of the downward pressure during the downward movement of the arc side hook (6) to perform side-shaping of the arc side hook (6).

7. The multi-station continuous stamping device for an automotive exhaust valve body bracket according to claim 6, characterized in that: The guide pins (11) are disposed on the upper mold structure (U) and correspond one-to-one with the guide holes (10a) on the material strip (10), and a plurality of the guide pins (11) are evenly distributed at intervals on the feeding path of the material strip (10). The punching and guiding hole station (1) is equipped with a punching and guiding hole punch (1.1) installed on the upper die structure (U). The trimming station (2) includes a first trimming station (2.1), a second trimming station (2.2) and a third trimming station (2.3), and each trimming station (2) is respectively provided with a trimming punch (21) installed on the upper die structure (U) to perform punching and trimming operations on the part blank; The punching station (3) includes a first punching station (3.1), a second punching station (3.2) and a third punching station (3.3), and each punching station (3) is respectively provided with a special-shaped punch (31) installed on the upper die structure (U) to punch out T-shaped holes (101), rectangular holes (102) and support grooves (103) on the part blank in sequence.

8. The multi-station continuous stamping device for an automotive exhaust valve body bracket according to claim 7, characterized in that: The bending station (4) further includes an end bending station (4.3) for simultaneously bending the structural parts where the support grooves (103) are located at both ends of the part blank to form a pair of symmetrical supports (8). The end bending station (4.3) is provided with an end bending punch (4.31) installed on the upper die structure (U) and an end bending die (4.32) formed on the lower die structure (D). After the bending station (4) and before the fine blanking separation station (5), a support side forming station (9) is provided for side forming of the supports (8). The support side forming station (9) is provided with a side forming die (91) formed on the lower die structure (D).

9. A multi-station continuous stamping device for an automotive exhaust valve body bracket according to claim 8, characterized in that: The fine blanking separation station (5) includes a blanking station (5.1) and a cutting station (5.2). The blanking station (5.1) is equipped with a blanking punch (5.11) installed on the upper die structure (U) and a blanking channel (5.12) formed on the lower die structure (D). The cutting station (5.2) is provided with an upper cutting blade block (5.21) installed on the upper mold structure (U) and a lower cutting blade block (5.22) installed on the lower mold structure (D). The lower mold structure (D) is provided with a feeding guide channel (15) at the beginning and a waste material sliding channel (16) at the end.

10. The stamping method of the multi-station continuous stamping device for an automotive exhaust valve body bracket according to claim 9, characterized in that: Includes the following steps: S1, punching guide holes: feed the strip (10) into the mold from the feed guide channel (15), punch out a pair of symmetrical guide holes (10a) at the punching guide hole station (1) to establish the positioning benchmark for the whole process; S2, edge trimming: The strip (10) is conveyed to the edge trimming station (2) in a stepping manner to perform contour punching, forming a part blank connected to the strip skeleton by a process structure bridge. The process structure bridge bears the transmission force in subsequent feeding. S3, punching: The part blank is conveyed to the punching station (3) by stepping, and multiple irregular holes are punched out in the main plane area, including T-shaped holes (101), rectangular holes (102) and support grooves (103). S4. Two-stage bending forms an arc-shaped side hook (6): S4.1, Tear bending: The part blank is conveyed to the tear bending station (4.1). The tear bending punch (4.11) and tear bending die (4.12) cooperate to press down and tear the protruding part on the side of the blank to form a tear part (6.5) that is misaligned with the main plane. S4.2 Forming and bending: The blank with the tear (6.5) is conveyed to the forming and bending station (4.2). The forming and bending punch (4.21) and the forming and bending die (4.22) cooperate to bend the straight section (6.5b) of the tear (6.5) in an upward arc trajectory to form an arc side hook (6). S5, Side shaping: The blank with the arc side hook (6) is transported to the arc side hook side shaping station (7). The filling punch (71) is embedded in the hook cavity for support. At the same time, the shaping side block (72) applies a horizontal shaping force from the outside to accurately calibrate the shape and size of the arc side hook (6). S6. End bending and shaping: S6.1 End bending: The billet is transported to the end bending station (4.3) and the parts where the support grooves (103) are located at both ends of the billet are bent synchronously to form a pair of symmetrical supports (8). S6.2, Side shaping of bracket: The blank is transported to the side shaping station (9), and the bracket (8) is laterally shaped by the side shaping die (91) to ensure its angle and dimensional accuracy; S7. Fine blanking separation: The final formed blank is conveyed to the fine blanking separation station (5). S7.1, Blanking: The blanking punch (5.11) cuts off all process structure bridges, allowing the formed parts to detach from the strip skeleton through the blanking channel (5.12); S7.2, Waste cutting: The upper cutting blade (5.21) and the lower cutting blade (5.22) work together to cut off the remaining waste after it is dropped, and the waste is discharged through the waste sliding channel (16); Starting from step S2, the conveying and positioning of the strip (10) in each step are precisely positioned by the guide pin (11) corresponding to the station and the guide hole (10a) formed in step S1, so as to realize continuous synchronous stamping of multiple stations.

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