Forming Process of Automobile Rear Wheel Arch Connecting Plate

Abstract

The present invention discloses a forming process for an automobile rear wheel cover connecting plate. After the sheet metal enters from the forming die assembly, four forming processes are carried out within the forming die assembly, and a set of forming dies is arranged in each forming process. The upper die assemblies of each set of forming dies are all connected to the upper die fixing plate of the forming die assembly, and the lower die assemblies of each set of forming dies are all connected to the lower die fixing plate of the forming die assembly; in the first forming process, multiple pressing grooves (1-5) with the same depth as the step (1-3) are simultaneously formed along the periphery of the step (1-3) of the main plane (1-1) of the product. In this way, the pulling stress from both ends to the middle direction will be generated during the forming of the pressing grooves, so as to balance the tensile stress generated by the middle step, achieving the effect of reducing the twisting deformation of the product; at the same time, the four processes are concentrated in the die assembly for pipeline production, which can greatly improve the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of forming processes, and specifically to a forming process for an automobile rear wheel housing connecting plate. Background Art

[0002] Currently, the domestic demand for the automobile market in China is very large, and the domestic automobile field is developing by leaps and bounds. Each automobile leaving the factory has to undergo inspections, and each component is one of the key factors affecting the automobile experience and quality, because this is related to the safety performance and service life of the automobile. The automobile rear wheel housing connecting plate is a connecting plate used to connect the automobile rear wheel housing and the rear bumper, and plays a role in connection, protection and sealing. Usually, the rear wheel housing connection is made of aluminum plate, and the plate thickness is usually about 1.5 mm. Generally speaking, it is a thin-walled part with a large plane area and no reinforcing ribs, including a main plane 1-1 and a side wall plate 1-2 connected to part of the edges of the main plane 1-1 On the main plane 1-1, there is also a step 1-3 with a depth of 0.25 mm in the middle, and there are also two through holes 1-4 on the main plane 1-1. Therefore, after forming, the distortion and warping of the flat surface are relatively large, and some distortion values reach 7 mm. This is caused by the uneven strain between the main plane in the middle of the product and the flange edge of the circumference. After the product forming is completed, the main plane in the middle will suck materials from the outside, while the flange around the main plane does not suck materials. This results in an internal stress between the main plane in the middle of the product and the flange circumference, thus causing the product to be distorted. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a forming process for an automobile rear wheel housing connecting plate that can eliminate internal stress and thus ensure that the product is not distorted after forming.

[0004] To solve the above technical problem, the forming process for the automobile rear wheel housing connecting plate provided by the present invention is as follows: after the sheet material enters the forming die assembly, four forming processes are carried out in the forming die assembly, and a set of forming dies is set in each forming process. The upper die assembly of each set of forming dies is connected to the upper die fixing plate of the forming die assembly, and the lower die assembly of each set of forming dies is connected to the lower die fixing plate of the forming die assembly; in the first forming process, multiple pressing grooves with the same depth as the step are simultaneously formed along the periphery of the step on the periphery of the step of the main plane of the product; the four forming processes sequentially include:

[0005] 1) The sheet material is stamped and blanked by a first forming die to obtain a first-formed semi-finished product, which is a plate-shaped semi-finished product after the overall part of the automobile rear wheel housing connecting plate is unfolded.

[0006] 2) The semi-finished product after the first forming is subjected to stretch forming by a secondary forming die to obtain a semi-finished product after the second forming. The stretch forming includes flanging the semi-finished product after the first forming to generate a side wall panel, pressing out a step on the main plane of the product, and a flange edge with multiple grooves along the periphery of the step;

[0007] 3) The semi-finished product after the second forming is subjected to punching forming by a tertiary forming die to obtain a semi-finished product after the third forming. This third forming punches holes in the main plane of the semi-finished product after the second forming to obtain through holes;

[0008] 4) The semi-finished product after the third forming is subjected to sizing forming by a quaternary forming die to obtain a finished product.

[0009] In the stamping and blanking forming of process 1), the sheet metal is fed from front to back, and a plate-shaped semi-finished product of a single part is punched out at one time.

[0010] In the stretch forming of process 2), the forming die is a box structure with a downward pressure plate; two forming cavities are arranged in one die. The positions of the side wall panels of the products in the two forming cavities are opposite and the distance is the largest. The main plane of the product is inclined, and the connection position between the side wall panel and the main plane is the lowest position of the forming cavity.

[0011] In the stretch forming die in process 2), a lower side template is connected around the punch, and a forming cavity for the side wall panel of the product is formed between the lower side template and the punch.

[0012] In each set of dies, a drawer for placing sundries or tools is provided between the bottom plate of the lower die assembly and the lower die backing plate.

[0013] In the punching forming die of process 3) and the sizing forming die of process 4), the forming cavities at the position of the main plane of the product are all in a horizontal state.

[0014] In the sizing forming die in process 4), a plurality of limiting members are provided between the punch and the die, and are respectively connected around the forming cavity on the punch.

[0015] The limiting member includes a horizontal block and a vertical block that are integrally connected and in an L shape. The horizontal block is fixedly connected to the punch, and the vertical block is placed in the accommodating groove of the die; the side surface of the vertical block facing the inside of the die includes a lower arc surface, a transition arc surface, an upper arc surface, a lower plane, a transition plane, and an upper plane. The upper arc surface, the transition arc surface, and the lower arc surface are connected in sequence from top to bottom, and the upper plane, the transition plane, and the lower plane are connected in sequence from top to bottom. And the side formed by the upper arc surface, the transition arc surface, and the lower arc surface is connected to the side formed by the upper plane, the transition plane, and the lower plane. The other side formed by the upper plane, the transition plane, and the lower plane is connected to the side formed by another set of upper arc surface, transition arc surface, and lower arc surface.

[0016] After adopting the above forming process, compared with the prior art, the present invention has the following advantages:

[0017] Since tensile stress is generated in the direction from the periphery to the center during the forming of the main plane of the product, and in the present invention, a plurality of pressure grooves with the same depth as the step depth on the main plane are provided on the flange edge around the main plane of the product. The pressure grooves will generate tensile stress in the direction from both ends to the middle during the forming process, thereby balancing the tensile stress generated by the middle step and achieving the effect of reducing the torsional deformation of the product. At the same time, by concentrating the four processes in the die assembly for pipeline production, the production efficiency can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural view of the connecting plate of the rear wheel housing of an automobile involved in the present invention.

[0019] Figure 2 It is a schematic structural view of the stamping and blanking die in the one-time forming of the present invention.

[0020] Figure 3 It is a schematic structural view of the semi-finished sheet after one-time forming of the present invention.

[0021] Figure 4 It is a schematic structural view of the stretching die in the secondary forming of the present invention.

[0022] Figure 5 It is a schematic structural view of the punching die in the third forming of the present invention.

[0023] Figure 6 It is a schematic structural view of the sizing die in the fourth forming of the present invention.

[0024] Figure 7 is Figure 6 a partial structural view of

[0025] Figure 8 It is a schematic structural view of the limiting member in the present invention.

[0026] Wherein: 1 connecting plate of the rear wheel housing of an automobile; 1-1, main plane; 1-2, side wall panel; 1-3, step; 1-4, through hole; 1-5, pressure groove; 2, female die; 3, male die; 4, lower die side plate; 5, limiting plate; 5-1, horizontal block; 5-2, vertical block; 5-3, lower arc surface; 5-4, transition arc surface; 5-5, upper arc surface; 5-6, lower plane; 5-7, transition plane; 5-8, upper plane; 6, bottom plate; 7, lower die backing plate; 8, drawer; 9, positioning pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0028] Combined with Figures 1 to 8As can be seen from the schematic diagram of the die structure of the forming process of the rear wheel housing connecting plate of the present invention for an automobile, in the forming and stretching process of the backrest bracket of the automobile seat, after the sheet metal enters the forming die assembly, four forming processes are carried out within the forming die assembly, and a set of forming dies is set in each forming process. The upper die assemblies of each set of forming dies are all connected to the upper die fixing plate of the forming die assembly, and the lower die assemblies of each set of forming dies are all connected to the lower die fixing plate of the forming die assembly; in the first forming process, around the step 1-3 of the main plane 1-1 of the product, a plurality of pressure grooves 1-5 with the same depth as the step 1-3 are simultaneously formed along the periphery of the step 1-3; the four forming processes sequentially include:

[0029] 1) The sheet metal is stamped and blanked by a primary forming die to obtain a primary forming semi-finished product, which is a plate-shaped semi-finished product after the overall part of the rear wheel housing connecting plate of the automobile is unfolded;

[0030] 2) The primary forming semi-finished product is stretched and formed by a secondary forming die to obtain a secondary forming semi-finished product. The stretching and forming includes flanging the primary forming semi-finished product to generate the side wall 1-2, pressing out the step 1-3 of the main plane 1-1 of the product, and the flange with a plurality of pressure grooves 1-5 along the periphery of the step 1-3;

[0031] 3) The secondary forming semi-finished product is punched and formed by a tertiary forming die to obtain a tertiary forming semi-finished product. The third forming punches the main plane 1-1 of the secondary forming semi-finished product to obtain a through hole 1-4;

[0032] 4) The tertiary forming semi-finished product is formed by sizing with a quaternary forming die to obtain a finished product.

[0033] In the stamping and blanking forming of process 1), the sheet metal is fed from front to back, and the plate-shaped semi-finished product of a single part is punched out at one time.

[0034] In the stretching and forming of process 2), the forming die is a box structure with downward pressure on the blank. Two forming cavities are arranged in one die. The positions of the side walls 1-2 of the products in the two forming cavities are opposite and the distance is the largest. The main plane 1-1 of the product is inclined, and the connection position between the side wall 1-2 and the main plane 1-1 is the lowest position of the forming cavity.

[0035] In the stretching and forming die of process 2), a lower side template 4 is connected around the punch 3, and a forming cavity for the side wall 1-2 of the product is formed between the lower side template 4 and the punch 3.

[0036] In each set of dies, a drawer 8 for placing sundries or tools is provided between the bottom plate 6 of the lower die assembly and the lower die backing plate 7.

[0037] In the punching and forming die of process 3) and the sizing and forming die of process 4), the forming cavities at the main plane positions of the product are all in a horizontal state.

[0038] In the sizing and forming die of process 4), a plurality of limit members 5 are provided between the punch 3 and the die 2, and are respectively connected around the forming cavity on the punch 3.

[0039] The limit member 5 includes a horizontal block 5-1 and a vertical block 5-2 that are integrally formed in an L shape. The horizontal block 5-1 is fixedly connected to the punch 3, and the vertical block 5-2 is accommodated in the accommodation groove of the die 2. The side surface of the vertical block 5-2 facing the inside of the die includes a lower arc surface 5-3, a transition arc surface 5-4, an upper arc surface 5-5, a lower plane 5-6, a transition plane 5-7, and an upper plane 5-8. The upper arc surface 5-5, the transition arc surface 5-4, and the lower arc surface 5-3 are connected in sequence from top to bottom. The upper plane 5-8, the transition plane 5-7, and the lower plane 5-6 are connected in sequence from top to bottom. And the side formed by the upper arc surface 5-5, the transition arc surface 5-4, and the lower arc surface 5-3 is connected to the side formed by the upper plane 5-8, the transition plane 5-7, and the lower plane 5-6. The other side formed by the upper plane 5-8, the transition plane 5-7, and the lower plane 5-6 is connected to the side formed by another set of the upper arc surface 5-5, the transition arc surface 5-4, and the lower arc surface 5-3.

[0040] The above are only the preferred and feasible implementation examples of the present invention, and should not limit the scope of the rights of the present invention. For those skilled in the art, all other corresponding changes made by using the technical solutions and technical concepts of the present invention should fall within the protection scope of the claims of the present invention.

Claims

1. A forming process for the connecting plate of an automobile rear wheel cover, characterized in that: After the sheet metal enters the forming die assembly, four forming processes are carried out within the forming die assembly, and a set of forming dies is arranged in each forming process. The upper die assemblies of each set of forming dies are all connected to the upper die fixing plate of the forming die assembly, and the lower die assemblies of each set of forming dies are all connected to the lower die fixing plate of the forming die assembly; in the first forming process, multiple pressure grooves (1-5) with the same depth as the step (1-3) are simultaneously formed along the periphery of the step (1-3) of the main plane (1-1) of the product; the four forming processes successively include: 1) The sheet metal is subjected to stamping and blanking forming through a primary forming die to obtain a primary formed semi-finished product, which is a sheet-shaped semi-finished product after the overall part of the automotive rear wheel housing connecting plate is unfolded. 2) The primary formed semi-finished product is subjected to stretching forming through a secondary forming die to obtain a secondary formed semi-finished product. The stretching forming includes flanging the primary formed semi-finished product to generate a side wall panel (1-2), pressing out the step (1-3) of the main plane (1-1) of the product, and forming a flange edge with multiple pressure grooves (1-5) along the periphery of the step (1-3). 3) The secondary formed semi-finished product is subjected to punching forming through a tertiary forming die to obtain a tertiary formed semi-finished product. In this third forming process, through holes (1-4) are punched on the main plane (1-1) of the secondary formed semi-finished product. 4) The tertiary formed semi-finished product is subjected to sizing forming through a quaternary forming die to obtain a finished product.

2. The forming process of the rear wheel housing connecting plate of an automobile according to claim 1, wherein: In the stamping and blanking forming of process 1), the sheet metal is fed from front to back, and the sheet-shaped semi-finished product of a single part is punched out at one time.

3. The forming process of the rear wheel housing connecting plate of an automobile according to claim 1, characterized in that: In the stretching forming of process 2), the forming die is a box structure with a downward pressure plate; two forming cavities are arranged in one die. The positions of the side wall panels (1-2) of the products in the two forming cavities are opposite and at the maximum distance. The main plane (1-1) of the product is inclined, and the connection position between the side wall panel (1-2) and the main plane (1-1) is the lowest position of the forming cavity.

4. The forming process of the rear wheel housing connecting plate of an automobile according to claim 3, characterized in that: In the stretching forming die of process 2), a lower side template (4) is connected around the punch (3), and a forming cavity for the side wall panel (1-2) of the product is formed between the lower side template (4) and the punch (3).

5. The forming process of the connecting plate of the rear wheel housing of an automobile according to claim 1, characterized in that: In each set of dies, a drawer (8) for placing sundries or tools is provided between the bottom plate (6) of the lower die assembly and the lower die backing plate (7).

6. The forming process of the connecting plate of the automobile rear wheel cover according to claim 1, characterized in that: In the punching forming die of process 3) and the sizing forming die of process 4), the forming cavities at the main plane position of the product are all in a horizontal state.

7. The forming process of the connecting plate of the automobile rear wheel cover according to claim 1, characterized in that: In the sizing forming die of process 4), a plurality of limiting members (5) are arranged between the punch (3) and the die (2), and are respectively connected around the forming cavity on the punch (3).

8. The forming process of the rear wheel housing connecting plate of an automobile according to claim 7, characterized in that: The described limiting member (5) includes a horizontal block (5-1) and a vertical block (5-2) that are integrally formed into an L shape. The horizontal block (5-1) is fixedly connected to the punch (3), and the vertical block (5-2) is accommodated in the accommodation groove of the die (2). The side surface of the vertical block (5-2) facing the inside of the mold includes a lower arc surface (5-3), a transition arc surface (5-4), an upper arc surface (5-5), a lower plane (5-6), a transition plane (5-7), and an upper plane (5-8). Among them, the upper arc surface (5-5), the transition arc surface (5-4), and the lower arc surface (5-3) are connected in sequence from top to bottom, and the upper plane (5-8), the transition plane (5-7), and the lower plane (5-6) are connected in sequence from top to bottom. Moreover, the side formed by the upper arc surface (5-5), the transition arc surface (5-4), and the lower arc surface (5-3) is connected to the side formed by the upper plane (5-8), the transition plane (5-7), and the lower plane (5-6), and the other side formed by the upper plane (5-8), the transition plane (5-7), and the lower plane (5-6) is connected to the side formed by another set of the upper arc surface (5-5), the transition arc surface (5-4), and the lower arc surface (5-3).

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