A processing method of a tailgate lock cover

Abstract

The present application relates to a processing method of a tail gate lock cover, comprising the following steps: punching positioning hole, outer trimming, punching protruding wrinkle, small face folding, large face pre-folding, edge folding, detail trimming, main edge bending, shaping and blanking. In the process, the ear part is regarded as an independent whole, at this time the large face part is still in the horizontal plane and can be used as the bending reference surface, the small face part is folded downward, then the ear part is obtained, and the included angle between the large face part and the small face part is close to the design angle, so that no adjustment is needed before shaping, and finally the small face part is shaped to be flush with the transverse part, so as to meet the structural precision requirement and ensure the structural precision of the ear part and the relative position of the ear part and the transverse part and the side edge.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stamping processing, in particular to a processing method of a tail gate lock cover. BACKGROUND

[0002] Metal stamping is a common process for processing many metal products. With the diversification of customer needs, the design of the mold also needs to meet various product requirements.

[0003] Chinese patent CN114951438B discloses a continuous forming method of a T-shaped bent workpiece, which is actually a tail gate lock cover. The structure is a T-shaped bent structure, which has a connected horizontal part and a vertical part, and the bent edge is at the intersection position of the horizontal part and the vertical part. However, the design idea of this patent is mainly how to save material strip material in the layout of the forming area.

[0004] Figure 1 Another tail gate lock cover 100 is shown in FIG. 1, which also has a T-shaped bent structure with a horizontal part 101 and a vertical part 102. The middle of the horizontal part 101 and the vertical part 102 is a main bent edge 103. However, each of the two ends near the bent edge 103 is provided with an ear part 104. The middle of the vertical part 102 is a main body 1021, and the periphery is provided with a side edge 1022. The ear part 104 includes a large surface part 1041 and a small surface part 1042, and the small surface part 1042 and the large surface part 1041 have a secondary bent edge 1043 therebetween, and the extension direction of the secondary bent edge 1043 is parallel to the extension direction of the main bent edge 103. The small surface part 1042 is coplanar with the horizontal part 101, and the angle between the large surface part 1041 and the horizontal part 101 is an acute angle of 60°-80°, and the angle between the large surface part 1041 and the vertical part 102 is an acute angle of 45-60°. The large surface part 1041 is perpendicular to the side edge 1022 and smoothly transitions. Although the small surface part 1042 has the requirement of being coplanar with the horizontal part 101, the overall structure of the ear part 104 has relatively large independence from the horizontal part 101, and because of the connection relationship with the side edge 1022, the large surface part 1041 and the side edge 1022 must be formed at the same time. In the processing process, the large surface part 1041 and the small surface part 1042 are originally in the same plane, and are separated by the secondary bent edge 1043. If the small surface part 1042 is first made coplanar with the horizontal part 101, and then the side edge 1022 and the large surface part 1041 are formed, the deformation of the latter two will affect the small surface part 1042 and cannot meet the precision requirements.

[0005] Therefore, it is necessary to design a new forming method to solve the above problems. SUMMARY

[0006] The main purpose of the present application is to provide a processing method of tail gate lock cover, which can continuously form the tail gate lock cover, ensure the structure precision of the ear part and the relative position of the horizontal part and the side edge.

[0007] The present application realizes the above-mentioned purpose by the following technical scheme: a processing method of tail gate lock cover is used to form the tail gate lock cover, the tail gate lock cover includes a horizontal part, a main bending edge and a longitudinal part connected in sequence, each end of the main bending edge is provided with an ear part, the longitudinal part includes a main body directly connected to the main bending edge and a side edge perpendicularly bent on the periphery of the main body, and the horizontal part has an included angle greater than 90° with the main body; the cross section of the ear part is J-shaped, including a large surface part, a secondary bending edge and a small surface part connected in sequence; the extension direction of the secondary bending edge is parallel to the extension direction of the main bending edge, the small surface part is flush with the horizontal part, the large surface part is connected to one end of the side edge and smoothly transitions, and the process steps include:

[0008] S1, punching positioning hole: taking the two sides of the material belt as the positioning reference, the material belt is fed forward, the processing unit range of the material belt includes a connecting area and a forming area connected to one side of the connecting area, an inner positioning hole is punched in the center area of the connecting area, and a side positioning hole is punched in the outer side area of the forming area;

[0009] S2, external trimming: taking the inner positioning hole and the side positioning hole as the reference, a blank is cut out in the range of the forming area by a multi-step punching method, the blank includes the horizontal pre-forming part directly connected to the connecting area, the longitudinal pre-forming part connected to the horizontal pre-forming part, and the two ear-shaped pre-forming parts connected to the two sides of the longitudinal pre-forming part, the side positioning hole is located outside the range of the blank, and a processing allowance is left outside the blank;

[0010] S3, punching protrusion: taking the inner positioning hole as the reference, the concave-convex wrinkle structure in the design is pressed out on the horizontal pre-forming part and the longitudinal pre-forming part;

[0011] S4, small surface folding: taking the inner positioning hole as the reference, the small surface part is formed by folding up and down on the ear-shaped pre-forming body, so as to obtain the ear part;

[0012] S5, large surface pre-folding: taking the inner positioning hole as the reference, the large surface part is bent upward by 45-60° relative to the longitudinal pre-forming part;

[0013] S6, edge folding: taking the inner positioning hole as the reference, the edge of the longitudinal pre-forming part is folded downward to form the side edge, and the side edge and the large surface part reach the design angle at the same time;

[0014] S7, detailed trimming: cutting off the machining allowance on the blank and the fixed hole waste in the transverse pre-forming part and the longitudinal pre-forming part, taking the inner positioning hole as the reference, to obtain the transverse part and the longitudinal part;

[0015] S8, main edge bending: bending the longitudinal part downward to a set angle, taking the inner positioning hole as the reference, to obtain the main bending edge;

[0016] S9, shaping: shaping the blank according to the design structure of the tailgate lock cover;

[0017] S10, blanking: cutting off the connecting area, taking the inner positioning hole as the reference, to make the tailgate lock cover fall off.

[0018] Specifically, the processing unit range contains two forming areas, which are arranged on the two sides of the connecting area, and the connecting area is located in the middle of the material strip.

[0019] Further, the two forming areas are 180° center-symmetric with respect to the inner positioning hole, and the connecting positions of the two blanks with the connecting area are located on the two sides of the inner positioning hole.

[0020] Further, the connecting area has an S-shaped planar structure.

[0021] Specifically, the width of the machining allowance is 2-3 mm.

[0022] Specifically, the shaping step specifically operates as follows:

[0023] S91, process bending: bending the blank upward with respect to the connecting area, so that the facet part is located at the highest point of the blank, taking the inner positioning hole as the reference;

[0024] S92, material shaping: shaping the blank as a whole, taking the inner positioning hole as the reference, to obtain the tailgate lock cover;

[0025] S93, resetting: returning the transverse part to the horizontal plane, taking the inner positioning hole as the reference.

[0026] Further, after the process bending, the included angle between the longitudinal part and the horizontal plane reaches 45-60°.

[0027] Specifically, the main edge bending step simultaneously obtains two reinforcing grooves, and the two reinforcing grooves traverse the main bending edge.

[0028] Specifically, the detailed trimming step is followed by a chamfering step, which specifically operates as follows: chamfering and stamping the burr position, taking the inner positioning hole as the reference.

[0029] The beneficial effects of the technical scheme of the present application are as follows:

[0030] 1. This process treats the ear as an independent whole. At this time, the large face is still on the horizontal plane, which can be used as the bending reference plane. The small face is flipped down, and then the ear is obtained. The angle between the large face and the small face is close to the design angle. No further adjustment is needed before shaping. Finally, the small face is shaped to make it flush with the horizontal part to achieve the structural accuracy requirements and ensure the structural accuracy of the ear and its relative position with the horizontal and vertical parts.

[0031] 2. The forming area is arranged in a double-row top-down arrangement, which can save the area of ​​the strip and balance the bending force during the bending stage.

[0032] 3. The connecting area has an S-shaped planar structure, which can further save the width of the material strip.

[0033] 4. During the shaping process, the blank is first raised, and then reset after the blank is shaped. This temporarily increases the projected area of ​​the longitudinal part on the horizontal plane and improves the shaping effect. Attached Figure Description

[0034] Figure 1 A 3D view of the tailgate lock cover;

[0035] Figure 2 This is a top view showing the structural changes of the material strip;

[0036] Figure 3 A 3D view showing the local changes in the material strip during the process of folding from the small side to the edge;

[0037] Figure 4 A 3D view of the local changes in the strip during the process of bending the main side to resetting.

[0038] The diagram is marked as follows:

[0039] 100-Tailgate lock cover, 101-Horizontal part, 1011-Protrusion, 102-Vertical part, 1021-Main body, 1022-Side edge, 103-Main bending edge, 1031-Reinforcing groove, 104-Ear, 1041-Large part, 1042-Small part, 1043-Secondary bending edge;

[0040] 200-Strip, 1-Connecting area, 11-Inner positioning hole, 12-Side positioning hole, 2-Blank, 21-Transverse preforming part, 22-Longitudinal preforming part, 23-Ear-shaped preforming part. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to specific embodiments.

[0042] Example:

[0043] like Figure 1As shown, the tail gate lock cover 100 comprises a transverse portion 101, a main bent edge 103 and a longitudinal portion 102 connected in sequence, each end of the main bent edge 103 is provided with an ear portion 104, the longitudinal portion 102 comprises a main body 1021 connected to the main bent edge 103 and a side edge 1022 perpendicularly bent on the periphery of the main body 1021, the transverse portion 101 and the main body 1021 have an included angle greater than 90°; the ear portion 104 has a J-shaped cross section, comprising a large surface portion 1041, a secondary bent edge 1043 and a small surface portion 1042 connected in sequence; the extension direction of the secondary bent edge 1043 is parallel to the extension direction of the main bent edge 103, the small surface portion 1042 is flush with the transverse portion 101, and the large surface portion 1041 is connected to one end of the side edge 1022 and smoothly transitions. Two reinforcing grooves 1031 are arranged transversely on the main bent edge 103.

[0044] In the tail gate lock cover 100 of the present embodiment, the included angle between the large surface portion 1041 and the small surface portion 1042 is not greater than 90°, the included angle between the large surface portion 1041 and the main body 1021 is also not greater than 90°, and the surface of the large surface portion 1041 is substantially in the direction of the internal angle bisector of the transverse portion 101 and the longitudinal portion 102. Some fixing holes are arranged on the large surface portion 1041, the transverse portion 101 and the main body 1021. The middle of the transverse portion 101 and the longitudinal portion 102 each has a concave-convex wrinkle structure with a small height difference, which is used to improve the structural rigidity, and the side edge 1022 can also be used to improve the structural rigidity of the longitudinal portion 102, and the connection relationship between the large surface portion 1041 and the side edge 1022 can improve the anti-deformation ability of each other, so as to resist the internal stress deformation of the tail gate lock cover 100 when it is fixed by bolts.

[0045] As shown in the drawings, Figures 2 to 4 A processing method of a tail gate lock cover is used to form a tail gate lock cover 100, and the process steps include:

[0046] S1, punch positioning hole: take the two sides of the material belt 200 as the positioning reference to feed the material belt 200 forward, the processing unit range of the material belt 200 includes a strip-shaped connection area 1 and a forming area connected to one side of the connection area 1 (because there is no obvious boundary line in the forming process, it is not indicated), punch an inner positioning hole 11 in the center area of the connection area 1, and punch a side positioning hole 12 on each outer side area of the forming area.

[0047] Because the main bending edge 103 in the tail gate lock cover 100 must be bent, it will generate a lateral force. In theory, the processing unit range can only have one connection area 1 and one forming area. If this is the case, the bending stage needs to consider the offset of the connection area 1 caused by the bending force, which requires adding a mechanism to block the lateral offset of the connection area 1 in the bending step. The inner positioning hole 11 is shared by all steps, and the side positioning hole 12 is closer to the edge of the forming area than the inner positioning hole 11, so it is used as a positioning hole for the trimming step. The forming area is first trimmed to obtain a blank 2, which is a flat pre-formed structure of the tail gate lock cover 100. Except for the necessary inner hole waste and processing allowance, the material of the blank 2 is the material of the tail gate lock cover 100, and the side positioning hole 12 is located outside the range of the blank 2.

[0048] In order to save the area of the material strip 200 and balance the bending force in the bending stage, the layout mode of the forming area is a double-row opposite layout mode, and the connection area 1 is arranged in the middle of the material strip 200. Therefore, in this embodiment, the processing unit range actually contains two forming areas, which are arranged on both sides of the connection area 1 and are 180° center-symmetric with the inner positioning hole 11 as the reference. The connection positions of the two blanks 2 to the connection area 1 are located on both sides of the inner positioning hole 11. Because if the two connection positions are not opposite with the inner positioning hole 11 as the center, the connection area 1 will deform in an S shape when the main bending edge 103 is bent, and the inner positioning hole 11 will lose its positioning significance.

[0049] In order to further save the width of the material strip 200, the connection area 1 is in an S-shaped plane structure. Because the pre-formed structure of the blank 2 in the transverse part 101 (i.e., the transverse pre-formed part 21) actually contains a protruding part 1011, but the cross section of the transverse pre-formed part 21 and the connecting part must be outside the protruding part 1011, so the connection area 1 will be in a state of two sides staggered and recessed. The connection area 1 can be intentionally designed to be narrower, so it will be in an S-shaped plane structure. However, under the premise that the blank 2 is connected to both sides of the inner positioning hole 11, this design will not cause the S-shaped deformation problem to be more prone to occur.

[0050] S2, external trimming: based on the inner positioning hole 11 and the side positioning hole 12, the blank 2 is cut out in the range of the forming area by a multi-step punching method. The blank 2 includes the transverse pre-formed part 21 (the transverse part 101 in the structure before forming) directly connected to the connection area 1, the longitudinal pre-formed part 22 (the longitudinal part 102 in the structure before forming) connected to the transverse pre-formed part 21, and the two ear-shaped pre-formed parts 23 (the ear part 104 in the structure before forming) connected to both sides of the longitudinal pre-formed part 22.

[0051] Blank 2 is the material sheet area of tailgate lock cover 100 before forming, which is formed by cutting off the periphery of the forming area, and side positioning hole 12 is located in the cutting area. In order to ensure that blank 2 can move step by step, one end of blank 2 must be connected with connecting area 1 before blanking, and the other part is semi-suspended, so that it can be deformed freely. For the forming area, the total material removal is in a C-shaped structure, and direct cutting is easy to cause material jam. In order to avoid material jam, the waste material is disassembled into several I-shaped, T-shaped or L-shaped small waste materials, so that the cutting edge processing is usually completed by step punching.

[0052] S3, embossing: based on inner positioning hole 11, embossing structure in the design is pressed out on transverse pre-forming part 21 and longitudinal pre-forming part 22.

[0053] If transverse part 101 and longitudinal part 102 maintain a planar structure, they are easy to deform due to local stress when used for fixing. The embossed structure includes many transition areas with height difference, which can improve the structural rigidity of transverse part 101 and longitudinal part 102. Although the embossed structure is located in the interior of the material, embossing will cause horizontal displacement of the surrounding material, and the fixing holes are distributed on the surrounding material, so in order to make the position of the fixing holes accurate, embossing needs to be completed in advance, and then punching is performed. Considering the profile change caused by embossing, blank 2 is left with a processing allowance of 2-3 mm in width.

[0054] S4, small face folding: based on inner positioning hole 11, small face part 1042 is folded downward on ear-shaped pre-forming body 23, so as to obtain ear part 104.

[0055] This process regards ear part 104 as an independent whole, at this time, large face part 1041 is still on the horizontal plane and can be used as a bending reference surface. Small face part 1042 is folded downward, and then ear part 104 is obtained. The included angle between large face part 1041 and small face part 1042 is close to the design angle, and no adjustment is needed before shaping.

[0056] S5, large face pre-folding: based on inner positioning hole 11, large face part 1041 is folded upward by 45-60° relative to longitudinal pre-forming part 22.

[0057] S6, edge folding: based on inner positioning hole 11, the edge of longitudinal pre-forming part 22 is folded downward to form side edge 1022, and the design angle between side edge 1022 and large face part 1041 is achieved.

[0058] As Figure 3As shown, the part of the longitudinal pre-forming part 22 directly connected with the large surface part 1041 is the material where the side edge 1022 is located. The large surface part 1041 and the side edge 1022 will finally form an angle of 90°, so an intermediate angle is formed in step S5, and then the angle is enlarged to 90° in step S6.

[0059] S7, detail trimming: based on the inner positioning hole 11, the processing allowance on the blank 2 and the fixed hole waste in the transverse pre-forming part 21 and the longitudinal pre-forming part 22 are cut off to obtain the transverse part 101 and the longitudinal part 102.

[0060] In addition to the ear part 104, the other parts of the blank 2 are basically in the same horizontal plane, and the subsequent step involves overall bending, so the structure modification of the blank 2 and the cutting of the hole waste are completed in this step. At this time, the transverse part 101 and the longitudinal part 102 have basically reached the target structure, but they are still in the same plane and there is no main bending edge 103 between them.

[0061] After the detail trimming, burrs will generally appear on the opposite side of the cutting direction. If the product has no burr requirement, a chamfering step will be performed after the detail trimming step. In this step, the burr position is chamfered based on the inner positioning hole 11.

[0062] S8, main edge bending: based on the inner positioning hole 11, the longitudinal part 102 is folded downward to a set angle to obtain the main bending edge 103 and the reinforcing groove 1031.

[0063] The main bending edge 103 and the reinforcing groove 1031 are designed structures on the tailgate lock cover 100. The reinforcing groove 1031 can reduce the angle rebound of the longitudinal part 102.

[0064] S9, shaping: the blank 2 is shaped according to the design structure of the tailgate lock cover 100 to meet the precision requirements. For example, Figure 4 As shown, the specific operation is as follows:

[0065] S91, process bending: based on the inner positioning hole 11, the blank 2 is folded upward relative to the connecting area 1, so that the angle between the longitudinal part 102 and the horizontal plane is 45-60° and the small surface part 1042 is located at the highest point of the blank 2.

[0066] S92, overall shaping: based on the inner positioning hole 11, the blank 2 is shaped as a whole to obtain the tailgate lock cover 100.

[0067] S93, resetting: based on the inner positioning hole 11, the transverse part 101 is returned to the horizontal plane.

[0068] The main purpose of the shaping is to ensure that the angle of the main bend 103, the angle of the secondary bend 1043, the transition structure between the large surface 1041 and the side edge 1022, and the planeness of the small surface 1042 and the transverse portion 101 at these key positions reach the expected accuracy, guarantee the structural accuracy of the ear portion 104 and the relative position with the transverse portion 101 and the side edge 1022. Previously, the transverse portion 101 and the connecting area 1 are flush, after the main bend 103 is obtained, the angle between the longitudinal portion 102 and the horizontal plane will become very large, the projection area of the longitudinal portion 102 on the horizontal plane is too small, which is not conducive to the effect of the material shaping. Therefore, it is necessary to temporarily increase the projection area of the longitudinal portion 102 on the horizontal plane (the angle between the transverse portion 101 and the horizontal plane will not exceed 45) in the material shaping while keeping the bend angle of the main bend 103 basically unchanged, and then return to the initial position after the material shaping makes the tailgate lock cover 100 reach the expected accuracy, which is convenient for material falling.

[0069] S10, material falling: cutting the connecting area 1 with the inner positioning hole 11 as the reference, so that the tailgate lock cover 100 falls off.

[0070] At this time, the tailgate lock cover 100 has completed all the structure processing, and no longer needs to guide the material, so the connecting area 1 needs to be cut off.

[0071] The above only describes some embodiments of the present application. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A processing method of a tail gate lock cover, which is used to form a tail gate lock cover, the tail gate lock cover comprising a transverse portion, a main bent edge and a longitudinal portion connected in sequence, each end of the main bent edge is provided with an ear portion, the longitudinal portion comprises a main body directly connected to the main bent edge and a side edge perpendicularly bent on the periphery of the main body, and the transverse portion has an included angle greater than 90° with the main body; the ear portion has a J-shaped cross section, comprising a large surface portion, a secondary bent edge and a small surface portion connected in sequence; the extension direction of the secondary bent edge is parallel to the extension direction of the main bent edge, the small surface portion is flush with the transverse portion, the included angle between the large surface portion and the small surface portion is not greater than 90°, the included angle between the large surface portion and the main body is also not greater than 90°, and the large surface portion is connected to one end of the side edge and smoothly transitions; the processing method is characterized in that The process steps include: S1, punching positioning holes: taking the two sides of the material belt as positioning reference to feed the material belt forward, the processing unit range of the material belt includes a connecting area in a belt shape and a forming area connected to one side of the connecting area, a center area of the connecting area is punched with an inner positioning hole, and an outer side area of the forming area is punched with a side positioning hole; S2, external trimming: taking the inner positioning hole and the side positioning hole as reference, a blank is cut out in the range of the forming area by a multi-step punching method, the blank includes a transverse pre-forming part directly connected to the connecting area, a longitudinal pre-forming part connected to the transverse pre-forming part, and two ear-shaped pre-forming parts connected to both sides of the longitudinal pre-forming part, the side positioning hole is located outside the range of the blank, and a processing allowance is left outside the blank; S3, punching protrusions: taking the inner positioning hole as reference, the transverse pre-forming part and the longitudinal pre-forming part are pressed to design concave-convex wrinkle structures; S4, small face folding: taking the inner positioning hole as reference, the small face part is formed by folding the ear-shaped pre-forming part up and down, thereby obtaining the ear part; S5, large face pre-folding: taking the inner positioning hole as reference, the large face part is bent upward by 45-60° relative to the longitudinal pre-forming part; S6, edge folding: taking the inner positioning hole as reference, the edge of the longitudinal pre-forming part is folded downward to form the side edge, and the side edge and the large face part reach a design angle; S7, detailed trimming: taking the inner positioning hole as reference, the processing allowance on the blank and the fixed hole waste in the transverse pre-forming part and the longitudinal pre-forming part are cut off, thereby obtaining the transverse part and the longitudinal part; S8, main edge bending: taking the inner positioning hole as reference, the longitudinal part is folded downward to a set angle, thereby obtaining a main bending edge and a reinforcing groove; S9, shaping: the blank is shaped according to the design structure of the tailgate lock cover; S10, blanking: taking the inner positioning hole as reference, the connecting area is cut off, so that the tailgate lock cover falls off.

2. The method of claim 1, wherein: The processing unit range includes two forming areas, the two forming areas are arranged on both sides of the connecting area, and the connecting area is located in the middle of the material belt.

3. The method of claim 2, wherein: The two forming areas are 180° center-symmetric with reference to the inner positioning hole, and the connecting positions of the two blanks and the connecting area are located on both sides of the inner positioning hole.

4. The method of claim 3, wherein: The connecting area has an S-shaped planar structure.

5. The method of claim 1, wherein: The width of the processing allowance is 2-3 mm.

6. The method of claim 1, wherein: The shaping step specifically operates as follows: S91, process bending: taking the inner positioning hole as reference, the blank is bent upward relative to the connecting area, so that the small face part is located at the highest point of the blank; S92, material shaping: taking the inner positioning hole as reference, the blank is shaped as a whole, thereby obtaining the tailgate lock cover; S93, resetting: taking the inner positioning hole as reference, the transverse part is returned to the horizontal plane.

7. The method of claim 6, wherein: After the process bending, the included angle between the longitudinal part and the horizontal plane reaches 45-60°.

8. The method of claim 1, wherein: The main edge bending step simultaneously obtains two reinforcing grooves, and the two reinforcing grooves cross the main bending edge.

9. The method of claim 1, wherein: The detailed trimming step is followed by a chamfering step, which specifically operates as follows: taking the inner positioning hole as reference, the burr position is chamfered by stamping.

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