A continuous stamping method for a seat belt retractor bracket

Abstract

This invention relates to a continuous stamping method for a seat belt reel bracket, comprising the following steps: punching positioning holes, external trimming, wrinkling and bending, side trimming, side bending, synchronous punching, angle shaping, and blanking. In the continuous stamping process, this invention first pre-adjusts the main body and mounting part to a parallel state through a wrinkling and bending process, then simultaneously completes the synchronous punching operations for the window, assembly holes, and mounting holes. Finally, angle shaping adjusts the angle between the transition plate and the mounting plate to its preset angle. This not only simplifies the mechanism but also overcomes the defects of traditional bend-face punching, which easily leads to hole position offset, tilting, and positional errors. It ensures stable coaxiality and positional accuracy of each hole, effectively guaranteeing product assembly precision.

Description

Technical Field

[0001] This invention relates to the field of stamping technology, and in particular to a continuous stamping method for a seat belt reel bracket. Background Technology

[0002] The seatbelt height adjuster is located on the upper part of the B-pillars on both sides of the vehicle body, and it is used to restrain the upper support point of the three-point seatbelt. Its bracket is a metal part that can be manufactured using a continuous stamping process.

[0003] Figure 1 and Figure 2 The image shows a seatbelt reel bracket 1, which includes a guide section 11, a main body section 12, a transition section 13, and a mounting section 14 connected in sequence. The main body section 12, the transition section 13, and the mounting section 14 are continuously bent to form a Z-shaped structure.

[0004] 1. The guide portion 11 is a tongue-shaped bent end, and the transition surface in its middle serves as the upper stop point for the seat belt reel bracket 1 to slide on the guide rail, limiting the highest adjustment position of the bracket and preventing it from dislodging from the guide rail. A guide tongue 111 is provided at the transition position between the guide portion 11 and the main body portion 12, and the hooking direction of the guide tongue 111 is opposite to the hooking direction of the guide portion 11.

[0005] 2. The main body 12 has a groove-shaped structure, including a main plate 121 and bent edges 122 formed by bending from the left and right sides of the main plate 121 towards the same side. The bent edges 122 can provide planar reinforcement to the main plate 121 and also serve as a guiding and mating structure for the guide rail. The main plate 121 is provided with a window 1211, reinforcing ribs 1212, and several mounting holes 1213. The window 1211 is located in the middle of the main plate 121 and has a rectangular hollow structure, providing clearance for the seat belt to pass through. The reinforcing ribs 1212 extend laterally and are located on the side of the window 1211 near the guide part 11. The reinforcing ribs 1212 can work with the two bent edges 122 to enhance the structural strength around the window 1211. The mounting holes 1213 are located on the side of the window 1211 near the mounting part 14 and are used for fixing with other parts.

[0006] 3. The mounting part 14 includes a mounting plate 141, which has mounting holes 1411. One side of the mounting plate 14 is bent and connected to a limit hook 142. The mounting holes 1411 are used to fix the bracket to the body sheet metal. The limit hook 142 can prevent the bracket from falling off the guide rail from the other direction (lowest adjustment position).

[0007] 4. The transition section 13 includes a transition plate 131 that connects the main plate 121 and the mounting plate 141 at both ends. The transition plate 131 is provided with two ribs 132, and each rib 132 extends from the main plate 121 to the mounting plate 141. The two ribs 132 have an included angle of 20 to 45 degrees in the length direction, forming a triangular support structure to ensure the stability of the angle between the main plate 121 and the mounting plate 141.

[0008] In this structure, the main plate 121 and the mounting plate 141 are the two main mounting surfaces of the bracket. The main plate 121 and the mounting plate 141 are at a small angle, causing the mounting holes 1213 on the main plate 121 and 1411 on the mounting plate 141 to be axially non-parallel. If the hollow structure (window 1211, mounting hole 1213, mounting hole 1411) within the range of the main plate 121 and the mounting part 14 is punched out before bending, and then bent, the relative position of the holes is likely to be substandard. Also, due to the presence of the pressure rib 132, the transition part 13 will be difficult to deform, and it will be difficult to adjust by shaping if the hole position deviation is too large. If the hole is punched after bending, the punching direction will be different, which will make the mold more complicated.

[0009] Chinese patent CN216027518U discloses a stamping mold for a seat belt height adjuster bracket, which discloses a mold structure with a series of folding and edge-wrapping stations. However, the product structure is actually different. Secondly, the improvement is mainly reflected in a single station of folding and edge-wrapping. Ultimately, it can only solve the problem of material stripping from the folding and edge-wrapping structure. It cannot provide technical inspiration for simplifying the entire processing flow of the product or improving the structural accuracy.

[0010] Therefore, it is necessary to design a new molding method to solve the above problems. Summary of the Invention

[0011] The main objective of this invention is to provide a continuous stamping method for a seat belt reel bracket, which allows the main body and mounting part to be adjusted to a parallel relationship during bending, followed by punching, and finally correction of the bending angle. This not only simplifies the operation but also meets the requirements for hole position accuracy.

[0012] This invention achieves the above objective through the following technical solution: a continuous stamping method for a seat belt reel bracket, used to form a seat belt reel bracket, the seat belt reel bracket comprising a Z-shaped integrally connected main body, a transition part, and a mounting part, the main body comprising a main plate and bent edges formed by bending from the left and right sides of the main plate to the same side, the main plate having assembly holes, the mounting part comprising a mounting plate having mounting holes, the transition part comprising a transition plate and two pressure ribs, each pressure rib extending to the main plate and the mounting plate respectively at both ends, the two pressure ribs forming a triangular support structure, the process steps including: S1. Punching positioning holes: A strip of material is provided, the processing unit of which includes a connecting area extending along one side of the strip and a product area connected to one side of the connecting area. Several positioning holes are punched out outside the reserved area of ​​the product area as positioning references for subsequent steps. S2, External trimming: Remove the waste material around the mounting part, leaving a strip area and a cantilever part integrally connected to one side of the strip area. The range of the strip area includes all the material of the connecting area and the main body, and the range of the cantilever part includes all the material of the transition part and the mounting part. S3. Wrinkling and bending: Simultaneously form the angle between the main plate and the transition plate, the angle between the transition plate and the mounting plate, and two pressure ribs within the product area. The angle between the main plate and the transition plate is bent at its designed angle, and the angle between the transition plate and the mounting plate is smaller than its preset angle, so that the main plate and the mounting plate are temporarily parallel. S4. Side cutting edge: Within the range of the strip area, the strip waste between adjacent main parts is cut off to obtain the side contour of the main part and the inner contour of the connecting area; S5, Side bending: Simultaneously bend the two side materials of the front and rear main body sections that are close to each other to obtain two bent edges; S6. Simultaneous punching: Punching the main plate and the mounting plate together to simultaneously obtain the window, the assembly hole and the mounting hole; S7. Angle Shaping: The angle between the transition plate and the mounting plate is adjusted to a preset angle by punching. S8. Material removal: Cut off the connecting area to cause the seat belt reel bracket to fall off.

[0013] Specifically, the punching positioning hole step processes a first positioning hole, which is located within the range of the connection area and serves as one of the positioning references for all subsequent steps.

[0014] Furthermore, the punching positioning hole step also processes a second positioning hole, which is located within the range of the peripheral waste material, and serves as one of the positioning references for the external trimming step.

[0015] Furthermore, the punching positioning hole step also processes a third positioning hole, which is located within the waste area of ​​the window. The third positioning hole serves as one of the positioning references from the embossing and wrinkling step to the synchronous punching step.

[0016] Specifically, the external trimming step leaves a deformation allowance on the periphery of the cantilever, and the contour of the deformation allowance directly forms the target edge structure of the mounting plate after the wrinkling and bending.

[0017] Specifically, the main body is provided with a guide portion with a tongue-shaped bending structure at the position relative to the transition portion, the window is located in the middle of the main plate, and the main plate is also provided with a reinforcing rib extending laterally, the reinforcing rib being located on the side of the window near the guide portion; In the punching positioning hole step, the reinforcing rib is processed in the product area; before the wrinkling and bending step, a large U-shaped hole is cut in the strip area, and a large peninsula area extending towards the connecting area is formed inside the large U-shaped hole; between the wrinkling and bending step and the side cutting step, there is a large bending step, which bends the large peninsula area into the guide part; after the side cutting step, the connecting area is connected to the main plate through two connection points, which are located on both sides of the guide part.

[0018] Furthermore, the large U-shaped hole is formed by two L-shaped cutting processes in two steps.

[0019] Furthermore, a guide tongue is provided at the transition position between the guide portion and the main body portion, and the hooking direction of the guide tongue is opposite to the hooking direction of the guide portion; Between the outer cutting step and the side cutting step, a small U-shaped hole is cut in the peninsula area. The small U-shaped hole surrounds a small peninsula area that extends towards the reinforcing rib. During the side bending step, the small peninsula area is bent to form the guide tongue.

[0020] Furthermore, the small U-shaped hole is formed by two consecutive L-shaped cutting processes. The first L-shaped cutting occurs in the same step as the first L-shaped cutting of the large U-shaped hole, and the second L-shaped cutting process is completed simultaneously in the side cutting step.

[0021] Furthermore, a limit hook is bent and connected to one side of the mounting plate; The external trimming step obtains the outer contour of the limiting hook, and the side bending step simultaneously folds out the angle between the limiting hook and the mounting plate.

[0022] The beneficial effects of the technical solution of this invention are: 1. In the continuous stamping process, the present invention first pre-adjusts the main body and the mounting part to a parallel state through a wrinkling and bending process, and then completes the synchronous punching operation of the window, assembly hole and mounting hole in a unified manner. Finally, the angle is adjusted to the preset angle between the transition plate and the mounting plate through angle shaping. This not only simplifies the mechanism, but also changes the defects of hole position offset, tilt and positional error that are easy to occur when punching under the traditional inclined bending state. It makes the coaxiality and positional accuracy of each hole stable and effectively ensures the assembly accuracy of the product.

[0023] 2. By using multiple sets of positioning holes for graded positioning, the forming accuracy of each part of the product area is ensured, and the positioning benchmarks of each process are accurately matched, effectively avoiding the cumulative positioning error during continuous stamping. This reduces defects such as punching chipping, bending deformation, and dimensional deviations, significantly improving the yield rate and reducing the processing cost and scrap cost of mass production.

[0024] 3. By reserving a suitable deformation allowance when cutting the outer edge of the product area in advance, the local material can be wrinkled to directly form a rib to form a triangular support structure and a transition contour structure. Within the allowable deviation range of the transition contour, the step of secondary edge cutting and fine adjustment is saved, and the processing procedure is simplified.

[0025] 4. By placing the reinforcing ribs in the pre-forming stage, while the material strip is still relatively intact, sufficient material is ensured around it to compensate for the material flow. This also allows the reinforcing ribs to form an anti-deformation center in the middle of the product area, thereby improving the cutting, hole cutting, and bending accuracy of the surrounding material and enhancing the forming accuracy of product details.

[0026] 5. Large and small U-shaped holes are formed by step-by-step L-shaped cutting to avoid material jamming. The guide part is formed step-by-step by large bending and side bending, and the guide tongue is bent in the opposite direction. The three L-shaped cuts take advantage of the time when the material strip is still relatively intact, while the fourth L-shaped cut is placed afterward to reduce the impact of the bending of the guide part on the guide tongue, so that the material in the middle can temporarily maintain its flatness.

[0027] 6. This invention integrates rib forming, multi-position bending, U-shaped hole step-by-step cutting, and fine structure forming into a continuous stamping process. Through process design such as pre-bending compensation, allowance reservation, and synchronous forming, it reduces auxiliary processes such as secondary trimming, secondary shaping, and secondary punching. The process integration is high, which is suitable for automated continuous batch production and greatly improves the production cycle. Attached Figure Description

[0028] Figure 1 A 3D view of the seatbelt reel bracket; Figure 2 Front view of the seatbelt reel bracket; Figure 3 This is a diagram showing the overall changes in the material strip; Figure 4 This is a top view of the initial deformation section of the strip; Figure 5 This is a top view of the deformation section in the middle of the strip; Figure 6 This is a top view of the deformed section at the tail of the conveyor belt; Figure 7 This is a diagram showing the changes in the cross-section of the strip before and after angle shaping.

[0029] above Figures 4 to 6The black area in the image represents the current area of ​​material to be removed.

[0030] The diagram is marked as follows: 100-Material strip, 101a-First positioning hole, 101b-Second positioning hole, 101c-Third positioning hole, 102-Strip area, 1021-Large U-shaped hole, 1022-Small U-shaped hole, 1023-Large peninsula area, 1024-Connecting area, 1025-Small peninsula area, 103-Cantilever section; 1-Seat belt reel bracket, 11-Guide part, 111-Guide tongue, 12-Main body, 121-Main plate, 1211-Window, 1212-Reinforcing rib, 1213-Assembly hole, 122-Bending edge, 13-Transition part, 131-Transition plate, 132-Pressure rib, 14-Mounting part, 141-Mounting plate, 1411-Mounting hole, 142-Limit hook. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to specific embodiments.

[0032] Example: This embodiment is used for molding the seat belt reel bracket 1, such as... Figure 1 and Figure 2 As shown, the seat belt reel bracket 1 includes a guide portion 11, a main body portion 12, a transition portion 13, and a mounting portion 14 connected sequentially and integrally. The main body portion 12, the transition portion 13, and the mounting portion 14 are continuously bent to form a Z-shaped structure. The guide portion 11 has a tongue-shaped bent end. A guide tongue 111 is provided at the transition position between the guide portion 11 and the main body portion 12. The hooking direction of the guide tongue 111 is opposite to the hooking direction of the guide portion 11. The main body portion 12 has a groove-shaped structure, including a main plate 121 and a bent edge 122 formed by bending from the left and right sides of the main plate 121 to the same side. A rectangular hollow window 1211 is provided in the middle of the main plate 121. A reinforcing rib 12 extending laterally is provided on the main plate 121. 12. The reinforcing rib 1212 is located on the side of the window 1211 near the guide part 11. The main plate 121 is provided with several mounting holes 1213 on the side of the window 1211 near the transition part 13. The transition part 13 includes a transition plate 131. The two ends of the transition plate 131 are connected to the main plate 121 and the mounting plate 141 respectively. The transition plate 131 is provided with two pressure ribs 132. Each pressure rib 132 extends from the main plate 121 to the mounting plate 141. The length direction of the two pressure ribs 132 has an included angle of 20~45° and forms a triangular support structure. The mounting part 14 includes a mounting plate 141. The mounting plate 141 is provided with mounting holes 1411. One side of the mounting plate 141 is bent and connected to a limit hook 142.

[0033] The continuous stamping method for the seat belt reel bracket in this embodiment uses continuous stamping of the strip 100. The processing unit of the strip 100 includes a connecting area 1024 extending along one side of the strip 100 and a product area connected to one side of the connecting area 1024. The overall continuous stamping process is coherent and suitable for automated production lines. The specific process steps are as follows: S1. Punching Positioning Holes: Using both sides of the strip 100 as initial positioning references, the strip 100 is conveyed forward. Three sets of positioning holes are punched within the processing unit of the strip 100, providing precise positioning references for the entire stamping process. Specifically, a first positioning hole 101a is punched in the center of the connecting area 1024. Located within the connecting area 1024, the first positioning hole 101a serves as the core positioning reference for all subsequent stamping steps. Simultaneously, a second positioning hole 101b is punched within the outer waste area outside the forming area. This second positioning hole 101b serves as the positioning reference for the external trimming step. A third positioning hole 101c is also punched within the waste area corresponding to window 1211. This third positioning hole 101c serves as the exclusive positioning reference from the embossing step to the synchronous punching step. The multiple sets of positioning holes effectively avoid positioning deviations during continuous stamping, ensuring the processing accuracy of each process. Simultaneously, this step also processes and forms reinforcing ribs 1212 on the main flat plate 121 within the product area, enhancing the structural strength of the main body 12. Figure 3 and Figure 4 As shown.

[0034] The connecting area 1024 is the waste portion that keeps the product area from detaching during continuous processing. The first positioning hole 101a is located on the connecting area 1024, so it can serve as a positioning reference structure until the material is unloaded. However, in the layout of the strip 100, the connecting area 1024 is off-center, so the first positioning hole 101a is relatively far from the product area (especially the mounting part 14). Therefore, the second positioning hole 101b and the third positioning hole 101c are needed for auxiliary positioning. The second positioning hole 101b is close to the other side of the strip 100, basically located at the center of the outer waste, so it can provide more accurate edge positioning for the farthest area of ​​the product area; the third positioning hole 101c is located in the middle of the product area, so it can provide relatively accurate edge positioning for the central contour of the product area. In the punching positioning hole step, the material strip 100 still maintains a relatively high integrity as a whole. At this time, when processing the reinforcing rib 1212, there is sufficient material around it to compensate for the material flow, so that punching the reinforcing rib 1212 does not affect the product outline generated by subsequent edge cutting. After obtaining the reinforcing rib 1212 structure, this part can also become a deformation-resistant center to avoid the forming on both sides from affecting each other.

[0035] S2. External Cutting: Using the first positioning hole 101a and the second positioning hole 101b as precise positioning references, the outer waste material is removed within the product area through multi-step punching, forming the overall outline of the blank. After punching, a strip area 102 and a cantilever portion 103 integrally connected to one side of the strip area 102 are left. The strip area 102 covers all the processed material of the connecting area 1024 and the main body 12, and the cantilever portion 103 covers all the processed material of the transition portion 13 and the mounting portion 14. For example... Figure 3 and Figure 4 As shown.

[0036] This step involves reserving a deformation allowance around the cantilever portion 103. This allowance is designed so that the side of the cantilever portion 103 is not a straight structure but rather slightly convex. The extent of this convexity is compensated for based on the actual processing. This deformation allowance's contour can be directly formed into the target edge structure of the mounting plate 141 after subsequent wrinkling and bending processes, eliminating the need for secondary trimming and simplifying the processing. Simultaneously, this step precisely punches out the complete outer contour of the limiting hook 142, laying the structural foundation for the subsequent bending and forming of the limiting hook 142.

[0037] S3. Wrinkling and Bending: Using the first positioning hole 101a and the third positioning hole 101c as positioning references, multiple forming processes are simultaneously completed within the product area, simultaneously forming the angle between the main plate 121 and the transition plate 131, the angle between the transition plate 131 and the mounting plate 141, and the two pressure ribs 132. The angle between the main plate 121 and the transition plate 131 is precisely bent according to the product design standard angle, while the angle between the transition plate 131 and the mounting plate 141 is less than the preset design angle, temporarily maintaining the parallel relationship between the main plate 121 and the mounting plate 141. This avoids hole position offset and hole diameter deviation problems caused by the inclined structure in subsequent punching processes, ensuring punching accuracy. Figure 3 and Figure 5 As shown.

[0038] This step involves Z-shaped bending, including the embossing effect of the rib 132. This process employs a complementary bending angle compensation technique. By compensating for the difference in bending angles between the main plate 121 and the transition plate 131, and between the transition plate 131 and the mounting plate 141, the bending height difference is intentionally offset while preserving the final Z-shaped structural dimensions of the bracket. This ensures that the bent main plate 121 and the mounting plate 141 are temporarily parallel to each other, allowing all subsequent holes (window 1211, assembly hole 1213, mounting hole 1411) to be punched in one go along the vertical mold closing direction. This significantly simplifies the mold structure and ensures consistent hole normals, thus simplifying mold design. Although the mounting plate 141 does not directly reach the preset angle on the product in this step, it is very close (approximately 5°), so the error is within a controllable range. During the process of creating the rib 132, the material on both sides of the cantilever 103 shrinks towards the center; the deformation allowance is set to accommodate this change. Although this method of cutting the edges first and then wrinkling will result in a lower actual contour accuracy of the transition plate 131, the function of the transition part 13 itself is to ensure the positional accuracy between the main body part 12 and the mounting part 14, so even if there is a large deviation, it is within an acceptable range.

[0039] Note: Before the large bending step, a large U-shaped hole 1021 is formed in the strip area 102; before the side bending step (simultaneously bending out the guide tongue 111), a small U-shaped hole 1022 is formed in the strip area 102. The large U-shaped hole 1021 is formed by two L-shaped cutting processes in two steps (actually both are in the punching positioning hole step). The two-step L-shaped cutting can effectively avoid material deformation and edge chipping caused by a single punching. The inner side of the large U-shaped hole 1021 forms a large peninsula area 1023 extending towards the connecting area 1024. The small U-shaped hole 1022 is formed by two L-shaped cutting processes. The first L-shaped cutting is completed simultaneously with the first L-shaped cutting of the large U-shaped hole 1021 in the same step, improving the process integration. The second L-shaped cutting process of the small U-shaped hole 1022 is completed simultaneously in the side cutting step, thoroughly trimming the edge contour of the small peninsula area 1025. The inner side of the small U-shaped hole 1022 forms a small peninsula area 1025 extending towards the reinforcing rib 1212. The removal part of the U-shaped hole structure is prone to material jamming, so it is usually split into two steps for waste removal. The above three L-shaped cuts also take advantage of the time when the strip 100 is still relatively intact, while the fourth L-shaped cut is placed afterward to reduce the impact of the bending of the guide part 11 on the guide tongue 111, so that the material in the middle can temporarily maintain its flatness.

[0040] S4. Large Bending Step: The large peninsula area 1023 enclosed by the large U-shaped hole 1021 is subjected to overall bending processing, precisely bending the large peninsula area 1023 into the guide part 11. The formed guide part 11 has a regular structure and precise dimensions, meeting the guidance requirements for bracket assembly.Figure 5 As shown.

[0041] S5. Side Cutting: Precisely cut off the strip of waste material between two adjacent main body parts 12 within the strip area 102, accurately shaping the side contour of the main body part 12 and the inner contour of the connecting area 1024. After this step, the connecting area 1024 is connected to the main plate 121 only through two symmetrically arranged connection points. The two connection points are respectively distributed on both sides of the guide part 11, which not only ensures the connection stability between the product and the strip 100 during continuous stamping, but also avoids angular deflection deformation of single-point connection, providing a precise separation position for the subsequent blanking process. Figure 6 As shown.

[0042] The reason why the inner contour is not cut off simultaneously in the external trimming step is that in the early stage of continuous stamping, each processing unit achieves overall support of the strip through the strip area 102. The materials between each product area are interconnected and mutually pulled, which can effectively constrain the twisting, warping and irregular deformation of the large area of ​​suspended material in the cantilever part 103 during bending and wrinkling forming, ensuring the stability of the forming benchmark in the early stage. After the early pressing, pre-bending and contour forming processes are completed, the excess connecting waste is cut off by the side trimming edge, which can not only ensure the forming accuracy, but also meet the structural separation requirements of the subsequent bending edge forming.

[0043] S6. Side Bending: Using the first positioning hole 101a as the positioning reference, the materials on both sides of the two adjacent main body parts 12 are simultaneously and symmetrically bent to form two bent edges 122 on the left and right sides of the main plate 121 in one step, ensuring that the bending angle and height of the bent edges 122 on both sides are completely consistent, improving product consistency. This step also involves bending the small peninsula area 1025 enclosed by the small U-shaped hole 1022, bending it into a guide tongue 111, ensuring that the guide tongue 111 maintains the opposite hooking direction to the guide part 11, matching the product design structure. Simultaneously, this step also completes the bending forming of the angle between the limiting hook 142 and the mounting plate 141, completing multiple sets of fine structure processing in one go, improving processing efficiency. Figure 6 As shown.

[0044] The side bending here does not result in two bent edges on the same main plate 121, but rather two bent edges 122 that are close to each other in two processing units. This is because only one strip-shaped bending punch is needed, and bending can be completed simultaneously using the opposite sides of the bending punch. The horizontal components of the two reaction forces of the two bent edges 122 on the bending punch cancel each other out, which helps to improve the service life of the bending punch.

[0045] S7. Synchronous punching: Using the first positioning hole 101a and the third positioning hole 101c as positioning references, the main plate 121 and the mounting plate 141, which are kept in a parallel state, are integrally and synchronously punched to form the window 1211 and the assembly hole 1213 on the main plate 121 and the mounting hole 1411 on the mounting plate 141 in one operation. Figure 6 As shown.

[0046] Since the main plate 121 and the mounting plate 141 are in a parallel and horizontal state before this process, the punching force is uniform, which can completely eliminate the problems of eccentricity of the inclined hole position and uneven hole diameter, and greatly improve the hole position size accuracy and position accuracy.

[0047] S8. Angle Shaping: Precisely shape and correct the pre-bent transition structure, adjusting the slightly small reserved angle between the transition plate 131 and the mounting plate 141 to the preset angle in the product design, and correcting the angle compensation amount of the pre-bent in the early stage. Figure 7 The slight change in the angle of the mounting section 14 is manifested in the installation section 14, which ensures that the overall Z-shaped structure of the seat belt reel bracket 1 fully meets the design standards and guarantees the product's external dimensions and assembly accuracy.

[0048] Because the transition plate 131 has two angled ribs 132, the overall structural rigidity of the transition area can be significantly improved, suppressing material springback after bending. However, this effect also applies to the temporary structure before angle correction, making it difficult for the material near the angle between the transition plate 131 and the mounting plate 141 to undergo plastic deformation. Therefore, angle shaping must be achieved by slightly over-pressing to overcome the deformation resistance of the rib structure, accurately correcting the pre-bending compensation angle between the transition plate 131 and the mounting plate 141 to the preset angle in the product design, avoiding local excessive deformation and angle deviation, and ensuring the overall dimensional accuracy of the Z-shaped structure of the product.

[0049] S9. Blanking: Using the first positioning hole 101a as the final positioning reference, precisely cut off the two connection points between the main plate 121 and the connecting area 1024, completely separating the product from the material belt 100 connecting area 1024, so that the processed seat belt reel bracket 1 automatically falls off, completing a single continuous stamping process. The subsequent material belt 100 continues to be conveyed, completing batch continuous production in a cycle. For example... Figure 6 and Figure 7 As shown.

[0050] In summary, this invention adopts a core process logic of pre-folding and leveling, followed by punching, and finally shaping and correction. Combined with a multi-station step-by-step hole cutting, step-by-step bending, and multi-reference positioning process design, it simplifies the cumbersome process of multiple bending and punching in traditional methods, and ensures the processing accuracy of each hole in the bracket from the source of the process. At the same time, through the integrated continuous forming of the pressure rib 132 triangular support structure, reinforcing rib 1212, guide part 11 and guide tongue 111, and through process designs such as pre-folding compensation, allowance reservation, and synchronous forming, it reduces auxiliary processes such as secondary trimming, secondary shaping, and secondary punching. The process integration is high, which is suitable for automated continuous batch production and greatly improves the production cycle.

[0051] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A continuous stamping method for a seat belt reel bracket, used to form a seat belt reel bracket, the seat belt reel bracket comprising a Z-shaped integrally connected main body, a transition part, and a mounting part, the main body comprising a main plate and bent edges formed by bending from the left and right sides of the main plate to the same side, the main plate having windows and mounting holes, the mounting part comprising a mounting plate having mounting holes, the transition part comprising a transition plate and two pressure ribs, each pressure rib extending at both ends to the main plate and the mounting plate respectively, the two pressure ribs forming a triangular support structure, characterized in that... The method steps include: S1. Punching positioning holes: A strip of material is provided, the processing unit of which includes a connecting area extending along one side of the strip and a product area connected to one side of the connecting area. Several positioning holes are punched out outside the reserved area of ​​the product area as positioning references for subsequent steps. S2, External trimming: Remove the waste material around the mounting part, leaving a strip area and a cantilever part integrally connected to one side of the strip area. The range of the strip area includes all the material of the connecting area and the main body, and the range of the cantilever part includes all the material of the transition part and the mounting part. S3. Wrinkling and bending: Simultaneously form the angle between the main plate and the transition plate, the angle between the transition plate and the mounting plate, and two pressure ribs within the product area. The angle between the main plate and the transition plate is bent at its designed angle, and the angle between the transition plate and the mounting plate is smaller than its preset angle, so that the main plate and the mounting plate are temporarily parallel. S4. Side cutting edge: Within the range of the strip area, the strip waste between adjacent main parts is cut off to obtain the side contour of the main part and the inner contour of the connecting area; S5, Side bending: Simultaneously bend the two side materials of the front and rear main body sections that are close to each other to obtain two bent edges; S6. Simultaneous punching: Punching the main plate and the mounting plate together to simultaneously obtain the window, the assembly hole and the mounting hole; S7. Angle Shaping: The angle between the transition plate and the mounting plate is adjusted to a preset angle by punching. S8. Material removal: Cut off the connecting area to cause the seat belt reel bracket to fall off.

2. The continuous stamping method for the seat belt reel bracket according to claim 1, characterized in that: The punching positioning hole step produces a first positioning hole, which is located within the connection area and serves as one of the positioning references for all subsequent steps.

3. The continuous stamping method for the seat belt reel bracket according to claim 2, characterized in that: The punching positioning hole step also processes a second positioning hole, which is located within the area of ​​the peripheral waste material. The second positioning hole serves as one of the positioning references for the external trimming step.

4. The continuous stamping method for the seat belt reel bracket according to claim 2, characterized in that: The punching positioning hole step also produces a third positioning hole, which is located within the waste area of ​​the window. The third positioning hole serves as one of the positioning references from the embossing and wrinkling step to the synchronous punching step.

5. The continuous stamping method for the seat belt reel bracket according to claim 1, characterized in that: The external trimming step leaves a deformation allowance on the periphery of the cantilever, and the contour of the deformation allowance directly forms the target edge structure of the mounting plate after the wrinkling and bending.

6. The continuous stamping method for the seat belt reel bracket according to claim 1, characterized in that: The main body is provided with a guide portion with a tongue-shaped bending structure at the position opposite to the transition portion. The window is located in the middle of the main plate. The main plate is also provided with a reinforcing rib extending laterally. The reinforcing rib is located on the side of the window near the guide portion. In the punching positioning hole step, the reinforcing rib is processed in the product area; before the wrinkling and bending step, a large U-shaped hole is cut in the strip area, and a large peninsula area extending towards the connecting area is formed inside the large U-shaped hole; between the wrinkling and bending step and the side cutting step, there is a large bending step, which bends the large peninsula area into the guide part; after the side cutting step, the connecting area is connected to the main plate through two connection points, which are located on both sides of the guide part.

7. The continuous stamping method for the seat belt reel bracket according to claim 6, characterized in that: The large U-shaped hole is formed by two L-shaped cutting processes in two steps.

8. The continuous stamping method for the seat belt reel bracket according to claim 7, characterized in that: A guide tongue is provided at the transition position between the guide portion and the main body portion, and the hooking direction of the guide tongue is opposite to the hooking direction of the guide portion; Between the outer cutting step and the side cutting step, a small U-shaped hole is cut in the peninsula area. The small U-shaped hole surrounds a small peninsula area that extends towards the reinforcing rib. During the side bending step, the small peninsula area is bent to form the guide tongue.

9. The continuous stamping method for the seat belt reel bracket according to claim 8, characterized in that: The small U-shaped hole is formed by two consecutive L-shaped cutting processes. The first L-shaped cutting occurs in the same step as the first L-shaped cutting of the large U-shaped hole, and the second L-shaped cutting process is completed simultaneously in the side cutting step.

10. The continuous stamping method for the seat belt reel bracket according to claim 8, characterized in that: One side of the mounting plate is bent and connected to a limit hook; The external trimming step obtains the outer contour of the limiting hook, and the side bending step simultaneously folds out the angle between the limiting hook and the mounting plate.

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