A progressive die for an automobile sheet metal part

Abstract

The application discloses a continuous die for automobile sheet metal parts, and belongs to the field of production and processing of automobile parts. The continuous die comprises an upper die plate and a lower die plate, a plurality of processing stations are continuously arranged between the upper die plate and the lower die plate, a conveying device for driving workpieces to be conveyed among the processing stations is further arranged between the upper die plate and the lower die plate, a material belt sequentially passes through each processing station, a trimming station, a stretching station group, a punching station and a cutting and discharging station are sequentially arranged between the upper die plate and the lower die plate, a guide-out plate is connected to the end face of the lower die plate, the stretching station group comprises 3-8 continuously arranged stretching stations, a profiling boss is arranged on each stretching station, and the heights of the plurality of continuously arranged profiling bosses gradually increase. The application effectively solves the problems of excessive material stretching and wrinkling of existing continuous dies when producing complex-shaped sheet metal parts, so that the surface quality of the parts is improved.

Description

Technical Field

[0001] This application relates to the field of automotive parts manufacturing and processing, and in particular to a progressive die for automotive sheet metal parts. Background Technology

[0002] With the rapid development of the automotive industry, the demand for automotive sheet metal parts is constantly increasing. As an important component of the car body, the forming quality of automotive sheet metal parts directly affects the overall performance and appearance of the vehicle. Traditional automotive sheet metal part production mainly uses single-process or multi-process molds for processing. These production methods have many shortcomings and are difficult to meet the high requirements of efficiency and quality in modern automotive manufacturing.

[0003] In existing technologies, single-operation molds have low production efficiency. Each mold needs to be replaced after completing a process, resulting in long production cycles, high labor intensity, and high mold manufacturing costs. For example, when producing the hinge mounting plate for the left rear door of a car, traditional single-operation molds require multiple mold changes to complete processes such as punching, trimming, and bending. This not only increases production time but also easily leads to inaccurate positioning due to mold changes, affecting product quality.

[0004] In recent years, progressive die technology has been increasingly applied to the production of automotive sheet metal parts. Progressive dies, by setting up multiple consecutive processing stations within a single die, allow the workpiece to complete various processes sequentially within the die, thereby significantly improving production efficiency.

[0005] Relevant prior art, such as Chinese patent application "A Continuous Stamping Die for a Hinge Mounting Plate on the Left Rear Door of an Automobile", application number: CN202322078463.7, discloses a die including an upper die structure and a lower die structure. A continuous workstation is set between the upper and lower die structures, and a conveying device is also provided between the upper and lower die structures to transport the workpiece between each workstation. Processing stations are sequentially arranged between the upper and lower die structures, improving production efficiency. Meanwhile, this utility model uses a continuous die, meaning that one die set continuously has multiple processing stations, allowing the product to complete the entire processing process in the same die set without changing the die. Furthermore, the material position is more accurate, improving the surface quality of the parts, increasing the gloss band, reducing fracture bands, ensuring the flatness of the part's surface, resulting in a wide contact surface and excellent conductivity. The industrial effects are significant, demonstrating excellent practicality.

[0006] However, existing progressive dies still present some challenges when producing sheet metal parts with certain complex shapes. For example, when processing sheet metal parts with deep draw or complex contours, existing progressive dies may not be able to precisely control the flow and deformation of the material. This can lead to overstretching or wrinkling of the material in certain areas, affecting the final dimensional accuracy and surface quality of the part. Utility Model Content

[0007] The technical problem to be solved by this application is to provide a progressive die for automotive sheet metal parts, which effectively solves the problems of excessive material stretching and wrinkling that exist in the production of complex-shaped sheet metal parts by existing progressive dies, thereby improving the surface quality of the parts.

[0008] The technical solution adopted in this application is: a progressive die for automotive sheet metal parts, including an upper die and a lower die, with multiple processing stations continuously arranged between the upper die and the lower die, and a conveying device for driving the workpiece to be conveyed between the upper die and the lower die. The material strip passes through each processing station in sequence. Between the upper die and the lower die, there are sequentially arranged edge trimming stations, stretching stations, punching stations and cutting and unloading stations. The end face of the lower die is connected to an output plate. The stretching station group includes 3-8 stretching stations arranged in sequence. The stretching stations are provided with contouring bosses, and the height of the multiple consecutively arranged contouring bosses gradually increases.

[0009] Compared with existing technologies, the advantages of this application are as follows: First, the progressive die of this application sets up 3-8 consecutive stretching stations in the stretching station group, and each stretching station is designed with a contour boss of gradually increasing height. This design can better guide the material flow, allowing the material to gradually adapt to complex shape changes during the stretching process. Through the gradually increasing contour bosses, the deformation of the material at each stretching station is rationally distributed, avoiding over-stretching at any station. During deep stretching, the material can deform gradually, rather than bearing excessive stress all at once, thereby reducing the risk of material fracture. The contour boss design can better support the material surface, reducing wrinkling during the stretching process. This gradual deformation method makes the material surface smoother, improving the surface quality of the parts.

[0010] Secondly, the progressive die of this application sequentially arranges the trimming station, drawing station group, punching station, and cut-off station between the upper and lower die plates. This sequential design ensures that the workpiece is in optimal processing condition at every step of the machining process. Trimming before drawing removes excess material from the edges, reducing uneven deformation during subsequent drawing and punching. This helps improve the dimensional accuracy and surface quality of the parts. Punching after drawing and trimming ensures accurate punching positions. Since the material is essentially shaped during drawing, deformation during punching is minimal, thus improving punching accuracy and quality.

[0011] Finally, the lower template end face of this application is connected to an ejector plate, which is used to smoothly eject the machined sheet metal part from the mold. The design of the ejector plate can ensure the stability of the part during the ejection process and avoid damage to the part due to improper ejection.

[0012] Preferably, the stretching station group includes 6 stretching stations arranged consecutively.

[0013] In some embodiments of this application, the trimming station has multiple material discharge ports, and a punching tool is provided below the upper template corresponding to each material discharge port. The punching tool is located directly above the material discharge port, and its structure matches the structure of the material discharge port. By providing multiple material discharge ports at the trimming station, and each material discharge port corresponding to a punching tool with a matching structure, the accuracy of trimming can be ensured. The matching structure of the punching tool with the material discharge port makes the material removal during the trimming process more uniform and precise, reducing burrs and unevenness after trimming.

[0014] In some embodiments of this application, a pressure plate is provided below the upper template corresponding to the contouring boss, and the bottom surface of the pressure plate is provided with a contouring groove adapted to the contouring boss; when the upper template is pressed down, it causes the pressure plate to press down, and the contouring boss is embedded in the contouring groove. The design of the pressure plate ensures that the contouring boss is in close contact with the workpiece during the stretching process, providing stable support. The matching design of the contouring groove and the contouring boss makes the material more evenly stressed during the stretching process, reducing wrinkling and deformation of the material.

[0015] In some embodiments of this application, at least one stretching station has multiple scrap ports, and a cutting edge tool is provided below the upper template corresponding to each scrap material. The cutting edge tool is located directly above the scrap port, and its structure matches the structure of the scrap port. The design of the scrap port and the cutting edge tool can effectively remove excess material generated during the stretching process. The matching structure of the cutting edge tool and the scrap port ensures cleaner and more efficient scrap removal, reducing the impact of scrap residue on subsequent processing. By removing scrap in a timely manner, the dimensions of the stretched parts can be more accurate, reducing dimensional deviations caused by scrap accumulation.

[0016] In some embodiments of this application, at least one stretching station is equipped with a punch, which is vertically positioned, with its top connected to an upper template and its bottom surface acting on the strip surface. The punch is designed to form a recessed structure on the strip during the stretching process. By directly forming the recessed structure at the stretching station, the number of subsequent processing steps is reduced, thus improving production efficiency.

[0017] In some embodiments of this application, at least one pressure plate has a channel that runs from top to bottom through the top and bottom surfaces of the pressure plate. Each channel corresponds to a punch, which passes through the pressure plate via the channel. This channel design provides a stable movement path for the punch, ensuring that the punch accurately acts on the material strip surface during the stamping process. The one-to-one correspondence between the channel and the punch reduces punch deviation and jitter during movement.

[0018] In some embodiments of this application, a punching cutter is provided on one side of the punching station. The punching cutter is positioned perpendicular to the punching surface of the automotive sheet metal part, and is connected to the upper template via a slanted guide block. The perpendicularity of the punching cutter to the punching surface ensures the accuracy and perpendicularity of the punching. The slanted guide block guides the punching cutter to accurately enter the punching position, reducing deviation during the punching process. Guided by the slanted guide block, the punching cutter can smoothly enter the material, reducing burrs generated during punching and improving punching quality.

[0019] In some embodiments of this application, a step-free station is provided before the punching station and after the stretching station group. The existence of the step-free station makes the processing sequence more reasonable, and the stretched parts can be stably transferred in the step-free station, preparing for the subsequent punching process.

[0020] In some embodiments of this application, a shaping station is provided between the punching station and the cutting and unloading station. A shaping block is provided on the shaping station. The shaping block is installed below the upper template. The upper template presses down, causing the pressure plate to press down on the material strip.

[0021] The shaping station allows for final shaping of parts after punching, ensuring dimensional accuracy and surface quality. The shaping block design enables fine-tuning of the parts to achieve higher precision requirements. Through adjustments to the shaping station, parts achieve high precision upon exiting the machine, reducing subsequent processing steps and improving production efficiency.

[0022] In some embodiments of this application, a cutting tool is provided above the cutting and unloading station; the guide plate is inclined and has a U-shaped longitudinal section, and the automotive sheet metal parts slide down along the guide plate.

[0023] The cutting blade can quickly cut the stamped automotive sheet metal parts from the strip, ensuring smooth output of the parts. The inclined U-shaped guide plate allows the parts to slide smoothly down the guide plate, reducing collisions and damage during the output process.

[0024] Based on common knowledge in the field, the above-described embodiments can be combined arbitrarily. Attached Figure Description

[0025] The present application will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0026] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a structural diagram of the template section below in this application; Figure 3 This is a structural diagram of the lower template where the pressure plate is placed in this application; Figure 4 This is a schematic diagram of the internal structure of this application; Figure 5 This is a cross-sectional view of the punching head in this application.

[0027] The specific explanations of the reference numerals in the attached drawings are as follows: 1. Upper template; 2. Lower template; 5. Material strip; 6. Trimming station; 7. Stretching station group; 8. Punching station; 9. Cutting and discharge station; 10. Guide plate; 12. Drop port; 13. Punching tool; 14. Pressure plate; 16. Scrap port; 17. Trimming tool; 18. Punch; 19. Channel; 20. Punching head; 21. Inclined guide block; 22. Idle step station; 23. Shaping station; 24. Shaping block; 25. Cutting tool. Detailed Implementation

[0028] The present application will now be described in detail with reference to the accompanying drawings.

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0030] A progressive die for automotive sheet metal parts, as described in Embodiment 1 Figure 1 , Figure 2 As shown: The system includes an upper template 1 and a lower template 2, with multiple processing stations continuously arranged between them. A conveyor device is also provided between the upper template 1 and the lower template 2 to transport the workpiece between each processing station. The material strip 5 passes through each processing station sequentially. Between the upper template 1 and the lower template 2, there are sequentially arranged a trimming station 6, a stretching station group 7, a punching station 8, and a cutting and unloading station 9. This sequential design ensures that the workpiece is in optimal processing condition at every step of the process. Trimming before stretching removes excess material from the edges, reducing uneven deformation during subsequent stretching and punching. This helps improve the dimensional accuracy and surface quality of the parts. Punching after stretching and trimming ensures accurate punching positions. Since the material is essentially shaped during stretching, deformation during punching is minimal, thus improving punching accuracy and quality.

[0031] The stretching station group 7 includes 3-8 consecutively arranged stretching stations, each equipped with a contouring boss. The height of the contouring bosses gradually increases across multiple consecutive stations. This design better guides material flow, allowing the material to gradually adapt to complex shape changes during stretching. The gradually increasing height of the contouring bosses ensures that the deformation at each stretching station is rationally distributed, preventing overstretching at any single station. During deep stretching, the material deforms gradually, rather than bearing excessive stress all at once, thus reducing the risk of material fracture. The contouring boss design also better supports the material surface, reducing wrinkling during stretching. This gradual deformation method results in a smoother material surface, improving the surface quality of the parts.

[0032] The lower template 2 of this application is connected to an ejector plate 10, which is used to smoothly eject the processed sheet metal parts from the mold. The design of the ejector plate 10 can ensure the stability of the parts during the ejection process and avoid damage to the parts due to improper ejection.

[0033] Preferably, the stretching station group 7 includes 6 stretching stations arranged consecutively.

[0034] Example 2, as Figures 1 to 5 As shown, the trimming station 6 has multiple material discharge ports 12. A punching cutter 13 is positioned below each material discharge port 12, directly above it, and its structure matches that of the discharge port 12. By providing multiple material discharge ports 12 on the trimming station 6, and each port 12 corresponding to a matching punching cutter 13, trimming accuracy is ensured. The matching structure of the punching cutter 13 with the discharge port 12 makes material removal during trimming more uniform and precise, reducing burrs and unevenness after trimming.

[0035] A pressure plate 14 is provided below the upper template 1 corresponding to the contouring boss. The bottom surface of the pressure plate 14 is provided with a contouring groove adapted to the contouring boss. When the upper template 1 is pressed down, it causes the pressure plate 14 to press down, and the contouring boss is embedded in the contouring groove. The design of the pressure plate 14 ensures that the contouring boss is in close contact with the workpiece during the stretching process, providing stable support. The matching design of the contouring groove and the contouring boss makes the material more evenly stressed during the stretching process, reducing wrinkling and deformation of the material.

[0036] At least one of the stretching stations has multiple scrap ports 16. A cutting edge tool 17 is positioned below the upper template 1, corresponding to each scrap port 16. The cutting edge tool 17 is located directly above the scrap port 16, and its structure matches that of the scrap port 16. The design of the scrap port 16 and the cutting edge tool 17 effectively removes excess material generated during the stretching process. The matching structure of the cutting edge tool 17 with the scrap port 16 ensures cleaner and more efficient scrap removal, reducing the impact of scrap residue on subsequent processing. Timely scrap removal ensures more accurate dimensions of the stretched parts, reducing dimensional deviations caused by scrap accumulation.

[0037] At least one of the stretching stations is equipped with a punch 18, which is vertically positioned. The top of the punch 18 is connected to the upper template 1, and the bottom surface of the punch 18 acts on the surface of the strip 5. The design of the punch 18 enables it to form a recessed structure on the strip 5 during the stretching process. By directly forming the recessed structure at the stretching station, the number of subsequent processing steps is reduced, thus improving production efficiency.

[0038] At least one of the pressure plates 14 has a channel 19 that runs from top to bottom through the top and bottom surfaces of the pressure plate 14. Each channel 19 corresponds to a punch 18, which passes through the pressure plate 14 via the channel 19. The design of the channel 19 provides a stable movement path for the punch 18, ensuring that the punch 18 accurately acts on the surface of the strip 5 during the stamping process. The one-to-one correspondence between the channel 19 and the punch 18 reduces the offset and vibration of the punch 18 during its movement.

[0039] A punching head 20 is provided on one side of the punching station 8. The punching head 20 is perpendicular to the punching surface of the automotive sheet metal part and is connected to the upper template 1 via a slanted guide block 21. The perpendicularity of the punching head 20 to the punching surface ensures the accuracy and perpendicularity of the punching. The slanted guide block 21 guides the punching head 20 to accurately enter the punching position, reducing deviation during the punching process. Guided by the slanted guide block 21, the punching head 20 can smoothly enter the material, reducing burrs generated during punching and improving punching quality.

[0040] A step station 22 is provided before the punching station 8 and after the stretching station group 7. The existence of the step station 22 makes the processing sequence more reasonable. The stretched parts can be stably transferred on the step station 22, preparing for the subsequent punching process.

[0041] A shaping station 23 is also provided between the punching station 8 and the cutting and unloading station 9. A shaping block 24 is installed on the shaping station 23, below the upper template 1. The upper template 1 presses down, causing the pressure plate 14 to press down on the strip 5. The shaping station 23 allows for final shaping of the parts after punching, ensuring dimensional accuracy and surface quality. The shaping block 24 allows for fine-tuning of the parts to achieve higher precision requirements. Through the adjustment of the shaping station 23, the parts achieve high precision upon unloading, reducing subsequent processing steps and improving production efficiency.

[0042] A cutting tool 25 is installed above the cutting and unloading station 9; the guide plate 10 is inclined and has a U-shaped longitudinal section, along which the automotive sheet metal parts slide down. The cutting tool 25 can quickly cut the stamped automotive sheet metal parts from the strip 5, ensuring that the parts can be smoothly unloaded. The inclined U-shaped guide plate 10 allows the parts to slide smoothly down along it, reducing collisions and damage during the unloading process.

[0043] The rest of the contents of Example 2 are the same as those of Example 1.

[0044] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A progressive die for automotive sheet metal parts, comprising an upper die (1) and a lower die (2), wherein multiple processing stations are continuously arranged between the upper die (1) and the lower die (2), and a conveying device for conveying workpieces between the upper die (1) and the lower die (2) is also provided, wherein a strip (5) passes through each processing station in sequence, characterized in that: Between the upper template (1) and the lower template (2), there are sequentially arranged a trimming station (6), a stretching station group (7), a punching station (8), and a cutting and discharge station (9). The end face of the lower template (2) is connected to the guide plate (10). The stretching station group (7) includes 3-8 stretching stations arranged continuously. The stretching station is provided with a contouring boss, and the height of the multiple contouring bosses arranged continuously gradually increases.

2. The progressive die for automotive sheet metal parts according to claim 1, characterized in that, The cutting station (6) has multiple material drop ports (12). A punching tool (13) is provided below the upper template (1) corresponding to each material drop port (12). The punching tool (13) is located directly above the material drop port (12), and the structure of the punching tool (13) matches the structure of the material drop port (12).

3. The progressive die for automotive sheet metal parts according to claim 1, characterized in that, A pressure plate (14) is provided below the upper template (1) corresponding to the contouring boss. The bottom surface of the pressure plate (14) is provided with a contouring groove adapted to the contouring boss. When the upper template (1) is pressed down, the pressure plate (14) is pressed down, and the contouring boss is embedded in the contouring groove.

4. A progressive die for automotive sheet metal parts according to claim 1, characterized in that, At least one of the stretching stations has multiple waste ports (16), and a cutting tool (17) is provided below the upper template (1) for each waste. The cutting tool (17) is located directly above the waste port (16), and the structure of the cutting tool (17) matches the structure of the waste port (16).

5. A progressive die for automotive sheet metal parts according to claim 3, characterized in that, At least one of the stretching stations is equipped with a punch (18), which is set vertically. The top of the punch (18) is connected to the upper template (1), and the bottom surface of the punch (18) acts on the surface of the strip (5).

6. A progressive die for automotive sheet metal parts according to claim 5, characterized in that, At least one of the pressure plates (14) has a channel (19) that runs from top to bottom through the top and bottom surfaces of the pressure plate (14). The channel (19) corresponds to the punch (18) one by one, and the punch (18) passes through the pressure plate (14) through the channel (19).

7. A progressive die for automotive sheet metal parts according to claim 1, characterized in that, A punching head (20) is provided on one side of the punching station (8). The punching head (20) is set perpendicular to the punching surface of the automotive sheet metal part. The punching head (20) is connected to the upper template (1) through an inclined guide block (21).

8. A progressive die for automotive sheet metal parts according to claim 1, characterized in that, A step station (22) is set before the punching station (8) and after the stretching station group (7).

9. A progressive die for automotive sheet metal parts according to claim 1, characterized in that, A shaping station (23) is also provided between the punching station (8) and the cutting and unloading station (9). A shaping block (24) is provided on the shaping station (23). The shaping block (24) is installed below the upper template (1). The upper template (1) presses down and drives the pressure plate (14) to press down on the material strip (5).

10. A progressive die for automotive sheet metal parts according to claim 1, characterized in that, A cutting tool (25) is provided above the cutting and discharge station (9); the discharge plate (10) is inclined and the longitudinal section of the discharge plate (10) is U-shaped, and the automotive sheet metal parts slide down along the discharge plate (10).

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