Method for press working left and right connecting plates of automobile rear wall inner plate

Abstract

The application discloses a stamping processing method of left and right connecting plates of a rear wall inner plate of an automobile, which is characterized by reasonable arrangement of processing procedures to complete the forming of the complex shape of the workpiece, effectively ensure the processing precision and avoid the cracking of the workpiece. The tail protruding boss is stamped outward at the tail of the workpiece, the upper edge and the two side edges of the tail protruding boss are consistent with the outer turning edge curve of the tail end of the finished product, the complex curve turning of the narrow tail of the workpiece can be reliably formed, and the problem that the precision cannot be ensured when the small-size complex surface is formed is solved. The first reinforcing groove is stamped on the connecting part between the left and right pieces in the first processing procedure, the overall strength of the workpiece is reinforced, and the deformation of the workpiece in the subsequent stamping processing and the carrying process is avoided. In the second, fourth and sixth processing procedures, the workpiece is turned over at an angle to facilitate the punching and shaping; the concave process gap prevents burrs and the trimming gap.

Description

Technical Field

[0001] This invention relates to a sheet metal stamping process, specifically to a stamping process for a front beam of an automobile and a stamping process for the left and right connecting plates of the inner rear panel of an automobile. Background Technology

[0002] The shape of the left and right connecting plates of the inner rear panel of the car is as follows: Figure 1 As shown, the workpiece has a complex overall shape and a narrow, complex curved flange at its tail, requiring high overall forming precision. Cracking is prone to occur during stamping, making the stamping process quite difficult. Furthermore, material deformation can easily occur during handling between different stamping processes, affecting processing quality. How to effectively ensure processing precision while avoiding workpiece cracking has become a challenging problem. In existing production, similar situations often involve separate forming of parts followed by welding, as illustrated in patent application CN202210722768.4, which describes a stamping production process for an automotive rear side panel assembly. This separate forming and welding process is not only inefficient but also more costly. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a stamping process for the left and right connecting plates of the rear inner panel of an automobile with a high yield.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a stamping process for the left and right connecting plates of the inner rear panel of an automobile, comprising the following steps:

[0005] S1. The sheet metal raw material is initially stamped and formed using a primary stamping die. The lower die of the primary stamping die is equipped with a floating support frame. The floating support frame has pre-formed plates with arc-shaped surfaces and upward protrusions on both sides. A ring of raised ribs is provided on the support frame corresponding to the outer periphery of the workpiece area. The upper die of the stamping die is equipped with a rib groove that matches the raised ribs. The middle part of the workpiece is stamped and pushed upward. A tail boss that protrudes outward is stamped at the tail of the workpiece. The upper edge and the two side edges of the tail boss are consistent with the curved surface of the outward-turned edge of the finished product tail. A first reinforcing groove is stamped on the connection between the left and right parts.

[0006] S2. Stamping is performed with the front material surface of the workpiece as the horizontal dividing interface to remove the connecting part between the front ends of the left and right parts of the workpiece, the excess material on the outer periphery of the tail of the workpiece, and the excess material on the outer side of the middle part of the workpiece.

[0007] S3. Using the surface of the raw material plate as the horizontal dividing interface, punch a notch in the connecting plate between the front ends of the left and right parts, and cut off the middle area of ​​the excess part of the boss at the rear of the left and right parts.

[0008] S4. Using the front material surface of the workpiece as the horizontal dividing interface, stamping is performed to remove the excess material on the outer edge of the front end of the workpiece, punching notches in the connecting plate between the tail ends of the left and right parts, and removing the areas on both sides of the excess part of the boss at the tail of the left and right parts.

[0009] S5. Using the surface of the raw material sheet as the horizontal dividing interface, turn the front and rear of the workpiece upwards where they need to be turned, punch notches in the middle connecting plate of the left and right parts, and further shape the workpiece.

[0010] S6. Stamping is performed with the front material surface of the workpiece as the horizontal dividing interface. The connecting material left in the middle connecting plate between the left and right parts is punched out by the last stamping die, and the left and right parts are shaped.

[0011] As a preferred embodiment, in step S1, the lower die of the initial stamping die is provided with a floating support frame, and the floating support frame is provided with pre-forming plates on both sides with arc-shaped surfaces and upward protrusions. A ring of raised ribs is provided on the support frame corresponding to the outer periphery of the workpiece area, and the upper die of the stamping die is provided with a rib groove that cooperates with the raised ribs.

[0012] As a preferred embodiment, in step S1, the initial stamping die simultaneously stamps out a second reinforcing groove in the excess material area on the outer side of the middle of the workpiece.

[0013] The beneficial effects of this invention are:

[0014] This stamping method, through a rational arrangement of processing steps, achieves the forming of complex workpiece shapes while effectively ensuring processing accuracy and preventing workpiece cracking. By stamping an outward-protruding tail boss at the workpiece's tail end, with the upper and side edges of the tail boss aligning with the curved surface of the finished product's outward-flaring tail end, the narrow, complex curved surface at the workpiece's tail end can be reliably formed, solving the problem of difficulty in ensuring accuracy when forming small, complex surfaces. In the first processing step, a first reinforcing groove is stamped on the connection between the left and right parts to enhance the overall strength of the workpiece and prevent deformation during subsequent stamping and handling. In the second, fourth, and sixth processing steps, the workpiece is flipped to facilitate punching and shaping; concave process notches prevent burrs and trimming notches; this method performs step-by-step punching of the remaining material at the workpiece connection and the outward-protruding tail boss portion, ensuring forming accuracy while preventing workpiece cracking and deformation.

[0015] In the first processing step, the lower die of the initial stamping die is equipped with a floating material support frame. The floating material support frame has pre-forming plates with arc-shaped surfaces and upward protrusions on both sides. A ring of raised ribs is provided on the material support frame corresponding to the outer periphery of the workpiece area. The upper die of the stamping die is equipped with a rib groove that matches the raised ribs to reduce the material drawing speed and avoid wrinkles on the workpiece.

[0016] Because the initial stamping die simultaneously stamps out a second reinforcing groove in the outer residual material area of ​​the workpiece, it not only makes the workpiece less prone to deformation during handling, but also makes it less likely for the workpiece edge to develop roughness or cracking when the residual material area of ​​the outer residual material area of ​​the workpiece is punched in the subsequent process. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the left and right connecting plates of the rear inner panel of a car.

[0018] Figure 2 This is a schematic diagram of the workpiece structure after the first processing step.

[0019] Figure 3 This is a schematic diagram of the workpiece structure after the second processing step.

[0020] Figure 4 This is a schematic diagram of the workpiece structure after the third processing step.

[0021] Figure 5 This is a schematic diagram of the workpiece structure after the fourth processing step.

[0022] Figure 6 This is a schematic diagram of the workpiece structure after the fifth processing step.

[0023] Figure 7 This is a schematic diagram of the workpiece structure after the sixth processing step.

[0024] In the figure: 1 front end of workpiece, 2 tail end of workpiece, 3 tail end boss, 4 connecting part, 5 first reinforcing groove, 6 second reinforcing groove, 7 surface of raw material plate, 8 front material surface, 9 notch. Detailed Implementation

[0025] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0026] like Figure 1-7 As shown, a stamping method for the left and right connecting plates of the inner rear panel of an automobile includes the following steps:

[0027] S1. A preliminary stamping die is used to initially stamp the sheet metal material. The lower die of the preliminary stamping die is equipped with a floating support frame. On both sides of the floating support frame are pre-formed plates with arc-shaped surfaces and upward protrusions. A ring of raised ribs is provided on the support frame corresponding to the outer periphery of the workpiece area. The upper die of the stamping die is equipped with rib grooves that cooperate with the raised ribs. The preliminary stamping die pushes the middle part of the workpiece upwards and stamps an outwardly protruding tail boss 3 at the tail 2 of the workpiece. The upper edge and the two side edges of the tail boss 3 are consistent with the curved surface of the outwardly turned edge of the finished product tail end. A first reinforcing groove 5 is stamped on the connecting part 4 between the left and right parts. At the same time, the preliminary stamping die stamps a second reinforcing groove 6 in the remaining material area on the outer side of the middle part of the workpiece.

[0028] S2. Stamping is performed with the front material surface 8 of the workpiece as the horizontal dividing interface to remove the connecting part 4 in the middle of the front end of the left and right parts of the workpiece, the excess material on the outer periphery of the tail 2 of the workpiece, and the excess material on the outer side of the middle part of the workpiece.

[0029] S3. Using the surface 7 of the raw material plate as the horizontal dividing interface, punch a notch 9 in the connecting plate between the front ends of the left and right parts, and cut off the middle area of ​​the excess part of the boss at the rear of the left and right parts.

[0030] S4. Using the front material surface 8 of the workpiece as the horizontal dividing interface, stamping is performed to cut off the excess material on the outer edge of the front end 1 of the workpiece, punching notch 9 between the connecting plate of the left and right tail ends, and cutting off the two sides of the excess part of the boss at the tail of the left and right parts.

[0031] S5. Using the surface 7 of the raw material sheet as the horizontal dividing interface, the front and rear ends of the workpiece that need to be flanged are flanged upwards, and the rear section of the connecting plate in the middle of the left and right parts is punched with notches 9 to further shape the workpiece.

[0032] S6. Stamping is performed using the front material surface 8 of the workpiece as the horizontal dividing interface. The connecting material remaining in the middle connecting plate between the left and right parts is punched out using the final stamping die, and the left and right parts are shaped.

[0033] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some examples of its application, and are not intended to limit the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention.

Claims

1. A stamping process for the left and right connecting plates of the rear inner panel of an automobile, comprising the following steps: S1. The sheet metal raw material is initially stamped and formed using a primary stamping die. The lower die of the primary stamping die is equipped with a floating support frame. The floating support frame has pre-formed plates with arc-shaped surfaces and upward protrusions on both sides. A ring of raised ribs is provided on the support frame corresponding to the outer periphery of the workpiece area. The upper die of the stamping die is equipped with a rib groove that matches the raised ribs. The middle part of the workpiece is stamped and pushed upward. A tail boss that protrudes outward is stamped at the tail of the workpiece. The upper edge and the two side edges of the tail boss are consistent with the curved surface of the outward-turned edge of the finished product tail. A first reinforcing groove is stamped on the connection between the left and right parts. S2. Stamping is performed with the front material surface of the workpiece as the horizontal dividing interface to remove the connecting part between the front ends of the left and right parts of the workpiece, the excess material on the outer periphery of the tail of the workpiece, and the excess material on the outer side of the middle part of the workpiece. S3. Using the surface of the raw material plate as the horizontal dividing interface, punch a notch in the connecting plate between the front ends of the left and right parts, and cut off the middle area of ​​the excess part of the boss at the rear of the left and right parts. S4. Using the front material surface of the workpiece as the horizontal dividing interface, stamping is performed to remove the excess material on the outer edge of the front end of the workpiece, punching notches in the connecting plate between the tail ends of the left and right parts, and removing the areas on both sides of the excess part of the boss at the tail of the left and right parts. S5. Using the surface of the raw material sheet as the horizontal dividing interface, turn the front and rear of the workpiece upwards where they need to be turned, punch notches in the middle connecting plate of the left and right parts, and further shape the workpiece. S6. Stamping is performed with the front material surface of the workpiece as the horizontal dividing interface. The connecting material left in the middle connecting plate between the left and right parts is punched out by the last stamping die, and the left and right parts are shaped.

2. The stamping process method for the left and right connecting plates of the rear inner panel of an automobile as described in claim 1, characterized in that: In step S1, the initial stamping die simultaneously stamps out a second reinforcing groove in the remaining material area on the outer side of the middle part of the workpiece.

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