A method for laying material for inner panels of left and right rear wheel covers and a drawing die

Abstract

The application relates to the technical field of automobile wheel cover production, and discloses a material distribution method and a drawing die for left and right rear wheel cover inner plates. The material distribution method comprises the following steps: obtaining a combined contour line and a combined line of the left and right rear wheel cover inner plates; obtaining a first boundary contour line for forming a rectangular plate material, and drawing a center axis and a diagonal line of the first boundary contour line; moving the contour line into the first boundary contour line and rotating the contour line as a whole, so that the combined line and the center axis form a preset angle alpha, and a modeling convex part of the right rear wheel cover inner plate is located on the diagonal line; drawing a shrink line of the left and right rear wheel cover inner plates outside the contour line, obtaining a second boundary contour line for forming a rectangular plate material, and the shrink line is located in the range of the second boundary contour line. The application has the beneficial effects of improving the utilization rate of the left and right rear wheel cover plate materials, saving forming materials, reducing the size of the drawing die, lowering the production cost, facilitating material discharge, and improving the production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of automobile wheel cover production, in particular to a material distribution method and a drawing die for left and right rear wheel cover inner panels. Background Art

[0002] The rear wheel covers of a car are used to help the driver compare the distance between the car body and external objects and to prevent mud and water during driving. The left and right rear wheel covers of a car are an important component of the side assembly and an indispensable component on the side of the car body.

[0003] The existing automobile rear wheel cover inner panel is mainly formed by a stamping process, which needs to be made through multiple processes such as drawing, trimming, shaping, trimming and punching. The automobile rear wheel cover inner panel includes left and right parts. In order to improve production efficiency, the left and right rear wheel covers are often merged into a hemispherical shape and demolded at the same time. Due to the different layout of the automobile body, the local structures of the left and right rear wheel cover inner panels are different. The right rear wheel cover inner panel generally has a protruding part relative to the left rear wheel cover inner panel. In the existing technology, the merging line of the left and right rear wheel cover inner panels is generally parallel to the mold and the central axis of the sheet material. The sheet material area used for its drawing is large, the sheet material utilization rate is low, resulting in material waste. At the same time, the size of the corresponding drawing die is large, a large production site is required, and the production cost is high. In addition, the automobile wheel cover inner panel is a sheet metal part, and a stamping die needs to be used separately to perform flanging processing on the sheet material during production. The process is complicated, and it is difficult to remove the part after the stamping is completed, and automated production cannot be achieved, resulting in low production efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for laying the inner panels of the left and right rear wheel covers and a drawing die, aiming to solve the technical problems in the prior art of low sheet material utilization, large drawing die size, complex process and difficulty in material removal.

[0005] In order to achieve the above object, the present invention provides a method for fabricating left and right rear wheel covers, comprising the steps of:

[0006] Obtain the merged contour line and merged line of the left and right rear wheelhouse inner panels;

[0007] Obtaining a first boundary contour line for forming a rectangular sheet material, and making a central axis and a diagonal line of the first boundary contour line;

[0008] The contour line is moved into the first boundary contour line and rotated as a whole, so that the merging line and the central axis form a preset angle α, and the protruding portion of the right rear wheelhouse inner panel molding is located on the diagonal line;

[0009] The contraction lines of the left and right rear wheelhouse inner panels are drawn outside the contour line to obtain a second boundary contour line for forming a rectangular sheet material, and the contraction line is located within the range of the second boundary contour line.

[0010] In order to achieve the above object, the present invention also provides a drawing die based on the above material distribution method: comprising a lower die base, a blank holder and an upper die base;

[0011] A punch for punching rectangular sheet materials is fixed in the middle of the lower die base, and a punch merging line is formed on the punch;

[0012] The blank holder is located above the lower die base and is used to place a rectangular sheet and drive the rectangular sheet to rise and fall. The merging line of the punch and the center axis of the rectangular sheet placed on the blank holder are at the preset angle α. The blank holder includes a frame body slidably connected to the lower die base, a mounting groove is provided in the middle of the frame body, a blank holder insert assembly is provided in the mounting groove, a drawbead shaping surface is provided on the top surface of the blank holder insert assembly, and a through hole for positioning with the punch is provided on the blank holder insert assembly;

[0013] The upper die seat is located above the frame and is slidably connected to the frame. A contoured cavity is provided in the middle of the upper die seat which can be molded with the outer shape of the top side wall of the punch. A contoured insert assembly is provided on the periphery of the contoured cavity. A contoured hole is opened on the contoured insert assembly. The upper edge contour of the contoured hole coincides with the edge contour of the contoured cavity. The inner side wall of the contoured hole is provided with a contoured surface which is molded with the outer side wall of the punch. The bottom surface of the contoured insert assembly is provided with a mold surface which is in contact with the shaping surface of the drawbead.

[0014] Furthermore, the angle formed by the merging line of the left and right rear wheel covers on the punch and the central axis of the lower die base is less than or equal to 45°.

[0015] Furthermore, the frame is provided with positioning tools around its periphery for placing and positioning the sheet materials.

[0016] Furthermore, a positioning piece is provided between the outer wall of the pressure ring insert assembly and the inner wall of the installation groove.

[0017] Furthermore, guide plates are used for sliding guidance between the lower die base and the frame body, and between the frame body and the upper die base.

[0018] Furthermore, the lower die base and the frame are both provided with balancing pads.

[0019] Furthermore, the bottom of the frame is evenly distributed with push rod legs, the bottom of the lower mold base is evenly distributed with through holes corresponding to the positions of the push rod legs and the same in number, and the push rod legs are inserted into the through holes.

[0020] Furthermore, a plurality of lifting holes are provided on the circumferential direction of the side wall of the punch.

[0021] Compared with the prior art, the present invention provides a method and drawing die for forming left and right rear wheelhouse inner panels. The method reduces the size of rectangular sheet metal and improves material utilization. The left and right rear wheelhouse inner panels are integrally formed using the drawing die provided by the present invention. The merging line on the punch and the center axis of the rectangular sheet metal are set at a preset angle, allowing for the use of smaller sheet metal for drawing, thereby improving sheet metal utilization and reducing the overall dimensions of the drawing die. This reduces the production footprint and reduces production costs. A blank holder is provided that can lift and lower the sheet metal, facilitating demolding of the left and right wheelhouses after the drawing process is completed. This facilitates material removal and provides a high degree of automation. The top surface of the blank holder insert assembly is provided with a drawbead shaping surface, the inner sidewall of the profiling hole is provided with a profiling surface that mates with the outer sidewall of the punch, and the bottom surface of the profiling insert assembly is provided with a mate surface that mates with the drawbead shaping surface. This eliminates the need for a separate stamping die for flanging, resulting in a simple process and high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the initial fabric drawing for the left and right rear wheel arch inner panels;

[0023] Figure 2 This is a diagram showing the fabric of the left and right rear wheelhouse inner panels according to an embodiment of the present invention;

[0024] Figure 3 1 is a schematic structural diagram of a drawing die according to an embodiment of the present invention;

[0025] Figure 4 is a structural schematic diagram of a drawing die from another perspective according to an embodiment of the present invention;

[0026] Figure 5 Schematic diagram of the installation of the punch of the drawing die according to an embodiment of the present invention;

[0027] Figure 6 Schematic diagram of the structure of the blank holder of the drawing die according to an embodiment of the present invention;

[0028] Figure 7 1 is a schematic structural diagram of an upper die base of a drawing die according to an embodiment of the present invention;

[0029] Figure 8 1 is a schematic structural diagram of an upper contour insert assembly of a drawing die according to an embodiment of the present invention;

[0030] Figure 9 It is a schematic structural diagram of the punch of the drawing die according to an embodiment of the present invention.

[0031] In the figure, 1. lower die base; 2. blank holder; 21. frame; 211. ejector leg; 22. mounting groove; 23. blank holder insert assembly; 231. drawbead shaping surface; 232. through hole; 24. positioning piece; 3. upper die base; 31. contoured cavity; 32. contoured insert assembly; 321. contoured hole; 3211. contoured surface; 322. closing surface; 4. punch; 41. lifting hole; 5. positioning tool; 6. guide plate; 7. balancing pad; a-contour line, a1-merge line, b1-first boundary line, b2-second boundary line, c-center axis, d-shrinkage line. DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc. used in the present invention to indicate the orientation or positional relationship are based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the devices and elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0034] like Figure 1 As shown, in order to improve the production efficiency of the left and right rear wheelhouse inner panels, the left and right rear wheelhouse inner panels are generally arranged in the center of the sheet material, and the merging line of the left and right rear wheelhouse inner panels is parallel to the central axis of the sheet material. Since the sheet material is a rectangular sheet material, its diagonal line is the longest. In order to further reduce the sheet material size and improve the sheet material utilization rate, the present invention provides a method for laying the left and right rear wheelhouse inner panels. The size of the rectangular sheet material is simulated and reduced on the drawing software. The specific steps are as follows:

[0035] Obtain the contour line a and the merged line a1 after the left and right rear wheelhouse inner panels are merged. The contour line a and the merged line a1 are generally obtained by analyzing with molding analysis software.

[0036] Obtain a first boundary contour line b1 for forming a rectangular sheet material, and draw a central axis c and a diagonal line of the first boundary contour line;

[0037] Move the contour line a into the first boundary contour line b1 and rotate it as a whole, so that the merged line a1 and the central axis form a preset angle α, and the protruding portion of the right rear wheelhouse inner panel molding is located on the diagonal line;

[0038] A contraction line d of the left and right rear wheel housings is drawn outside the contour line a, and a second boundary contour line b2 for forming a rectangular sheet material is obtained, and the contraction line d is located within the range of the second boundary contour line b2.

[0039] like Figure 2 As shown, the rectangular sheet adopts the second boundary contour line b2, the overall size is reduced, and the utilization rate of the sheet is improved. Although the size of the rectangular sheet changes, the central axis of the first boundary contour line b1 and the central axis of the second boundary contour line b2 are always parallel, so the merge line and the central axis of the rectangular sheet are always kept at a preset angle α, which is less than or equal to 45°. Figure 1 As shown, when α=0°, that is, the merging line of the left and right rear wheel covers is parallel to the central axis of the sheet material. At this time, the size of the rectangular sheet material is 1170mm*1190mm, and the utilization rate of the sheet material is 66.58%. Preferably, in this embodiment, α=16°, the size of the rectangular sheet material is 1120*1160mm, and the utilization rate of the sheet material is 71.34%. The utilization rate is significantly improved, which saves molding materials and reduces production costs.

[0040] To apply the above fabric method, see Figures 3 to 9 A drawing die in a preferred embodiment of the present invention can reduce the size of the die simultaneously due to the reduction in the size of the rectangular sheet, reduce the production space occupied, and further improve production efficiency and facilitate material removal. It includes a lower die base 1, a pressure ring 2 and an upper die base 3, which are described in detail below with reference to the accompanying drawings.

[0041] Specifically, a punch 4 is fixed in the middle of the lower die base 1. In order to draw out the shape of the left and right rear wheel covers, a punch merging line is formed on the punch 4.

[0042] The blank holder 2 is located above the lower die base 1 and is used to place the rectangular sheet material and drive the rectangular sheet material to rise and fall. In order to draw out the left and right rear wheel covers in the above-mentioned material-laying method, the merging line of the punch and the center axis of the rectangular sheet material placed on the blank holder 2 are at a preset angle α. The blank holder 2 includes a frame 21 that is slidably connected to the lower die base 1. A mounting groove 22 is provided in the middle of the frame 21. A blank holder block assembly 23 is provided in the mounting groove 22. A drawing rib shaping surface 231 is provided on the top surface of the blank holder block assembly 23. A through hole 232 for positioning with the punch 4 is provided on the blank holder block assembly 23. When the frame 21 moves to the upper limit position, the rectangular sheet material is loaded or taken out. When the frame 21 moves to the lower limit position, the rectangular sheet material is completed drawing.

[0043] The upper die base 3 is located above the frame 21 and is slidably connected to the frame 21. A contoured cavity 31 is provided in the middle of the upper die base 3, which can be molded with the outer shape of the top side wall of the punch 4. A contoured insert assembly 32 is provided on the outer periphery of the contoured cavity 31. A contoured hole 321 is provided on the contoured insert assembly 32. The upper edge contour of the contoured hole 321 coincides with the edge contour of the contoured cavity 31. The inner side wall of the contoured hole 321 is provided with a contoured surface 3211 which is molded with the outer side wall of the punch 4. The bottom surface of the contoured insert assembly 32 is provided with a mold surface 322 which is in contact with the drawbead shaping surface 231.

[0044] During the drawing process, the upper die base 3 and the frame 21 both move to the upper limit position, and then the rectangular sheet is placed on the frame 21 for loading. Then the upper die base 3 moves downward, and after pressing the sheet, the upper die base 3 and the frame 21 move downward synchronously to start drawing the rectangular sheet. When the upper die base 3 and the frame 21 move to the lower limit position at the same time, the drawing of the rectangular sheet is completed, and then the upper die base 3 and the frame 21 move upward, the upper die base 3 and the frame 21 are separated, and the drawn rectangular sheet can be taken out.

[0045] To facilitate the positioning of rectangular sheets, Figure 5 As shown, a positioning tool 5 for placing and positioning the sheet material is provided on the circumference of the frame 21 , and the positioning tool 5 includes an L-shaped mounting seat, on which a guiding inclined surface is provided.

[0046] In order to facilitate the installation and positioning between the pressure ring insert assembly 23 and the installation groove 22 and to adjust the installation gap, a positioning piece 24 is clamped between the outer wall of the pressure ring insert assembly 23 and the inner wall of the installation groove 22.

[0047] In this embodiment, see Figure 5 In order to facilitate sliding guidance between the lower mold base 1 and the frame 21, and between the frame 21 and the upper mold base 3, guide plates 6 are correspondingly installed on the lower mold base 1, the frame 21, and the upper mold base 3.

[0048] In order to facilitate mechanical limiting of the frame 21 and the upper die base 3 when they move to the lower limit position, balancing pads 7 are provided on the lower die base 1 and the frame 21 .

[0049] In order to facilitate the hydraulic press to lift the frame 21, push rod legs 211 are evenly distributed on the bottom of the frame 21, and through holes corresponding to the positions of the push rod legs and the same number as the push rod legs are evenly distributed on the bottom of the lower mold base 1, and the push rod legs 211 are inserted into the through holes.

[0050] In order to facilitate the lifting and transportation of the punch 4 and to adjust the installation position of the punch 4, a plurality of lifting holes 41 are provided on the circumferential side wall of the punch 4.

[0051] In summary, the embodiments of the present invention provide a method and drawing die for forming the inner panels of left and right rear wheel housings. This method reduces the size of rectangular sheet metal and improves material utilization. The left and right rear wheel housings are integrally formed using the drawing die provided by the present invention. The merging line on the punch and the center axis of the rectangular sheet metal are set at a preset angle. Smaller sheet metal is used for drawing, which improves sheet metal utilization. The overall dimensions of the drawing die can be reduced, occupying a smaller production area and reducing production costs. A blank holder is provided, which can drive the sheet metal to rise and fall. After the drawing process is completed, the left and right wheel housings can be easily removed from the mold, which is convenient and highly automated. The top surface of the blank holder insert assembly is provided with a drawbead shaping surface, the inner side wall of the profiling hole is provided with a profiling surface that mates with the outer side wall of the punch, and the bottom surface of the profiling insert assembly is provided with a mate surface that mates with the drawbead shaping surface. No additional stamping die is required for flanging, resulting in a simple process and high production efficiency.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for laying the material of the left and right rear wheel housing inner panels, characterized in that: Including steps: Obtain the merged contour line and merged line of the left and right rear wheelhouse inner panels; Obtaining a first boundary contour line for forming a rectangular sheet material, and making a central axis and a diagonal line of the first boundary contour line; The contour line is moved into the first boundary contour line and rotated as a whole, so that the merging line and the central axis form a preset angle α, and the protruding portion of the right rear wheelhouse inner panel molding is located on the diagonal line; The contraction lines of the left and right rear wheelhouse inner panels are drawn outside the contour line to obtain a second boundary contour line for forming a rectangular sheet material, and the contraction line is located within the range of the second boundary contour line.

2. A drawing die based on the method for laying the left and right rear wheelhouse inner panels according to claim 1, characterized in that: It comprises a lower die base (1), a pressure ring (2) and an upper die base (3); A punch (4) for punching rectangular sheet materials is fixed in the middle of the lower die base (1), and the punch (4) is formed with a punch merging line; The blank holder (2) is located above the lower die base (1) and is used to place a rectangular sheet and drive the rectangular sheet to rise and fall. The merging line of the punch and the center axis of the rectangular sheet placed on the blank holder (2) are at the preset angle α. The blank holder (2) includes a frame (21) slidably connected to the lower die base (1). A mounting groove (22) is provided in the middle of the frame (21). A blank holder block assembly (23) is provided in the mounting groove (22). A draw rib shaping surface (231) is provided on the top surface of the blank holder block assembly (23). A through hole (232) for positioning with the punch (4) is provided on the blank holder block assembly (23). The upper die seat (3) is located above the frame (21) and is slidably connected to the frame (21). A contoured cavity (31) capable of being molded with the outer shape of the top side wall of the punch (4) is provided in the middle of the upper die seat (3). A contoured insert assembly (32) is provided on the outer periphery of the contoured cavity (31). A contoured hole (321) is provided on the contoured insert assembly (32). The upper edge contour of the contoured hole (321) coincides with the edge contour of the contoured cavity (31). The inner side wall of the contoured hole (321) is provided with a contoured surface (3211) that is molded with the outer side wall of the punch (4). The bottom surface of the contoured insert assembly (32) is provided with a molded surface (322) that is in contact with the drawbead shaping surface (231).

3. The drawing die according to claim 2, wherein: The preset angle α is less than or equal to 45°.

4. The drawing die according to claim 2, wherein: The frame (21) is provided with a positioning tool (5) circumferentially for placing and positioning the sheet material.

5. The drawing die according to claim 2, wherein: A positioning piece (24) is clamped between the outer wall of the pressure ring insert assembly (23) and the inner wall of the installation groove (22).

6. The drawing die according to claim 2, wherein: The lower die base (1) and the frame (21), as well as the frame (21) and the upper die base (3) are both slidably guided by guide plates (6).

7. The drawing die according to claim 2, wherein: The lower die base (1) and the frame (21) are both provided with a balancing pad (7).

8. The drawing die according to claim 2, wherein: The bottom of the frame (21) is evenly distributed with push rod legs (211), and the bottom of the lower die base (1) is evenly distributed with through holes corresponding to the positions of the push rod legs (211) and having the same number as the push rod legs (211), and the push rod legs (211) are inserted into the through holes.

9. The drawing die according to claim 2, wherein: The side wall of the male mold (4) is circumferentially provided with a plurality of lifting holes (41).

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