Forming process of automobile hinge bracket

Abstract

The invention relates to a forming process of an automobile hinge support. The forming process comprises the steps of material shearing, five-time pre-stretching, first-time shaping, edge cutting, flanging shaping, punching, second-time shaping and inspection and warehousing. According to the forming process of the automobile hinge support, the standard production requirement is met after multiple times of stretching and shaping, the quality of produced products is stable, the percent of pass reaches 99.2%, and the production efficiency is high.

Description

A molding process for an automotive hinge bracket Technical Field

[0001] This invention relates to the field of automotive parts, and more specifically to a molding process for an automotive hinge bracket. Background Technology

[0002] In the current automotive manufacturing industry, the trunk lid hinge assembly is a safety feature that must be installed in mid-range and high-end sedans. Installed at the rear of the vehicle, it has two basic functions: first, connecting the body to the trunk lid and ensuring its position relative to the body; second, ensuring and facilitating the opening and closing of the trunk lid. The hinge bracket, as a key component of the hinge, has a crucial part in its engagement with the bushing. The boss and bushing are assembled, and then connected to the body panel via a pin to form the hinge assembly. Inconsistent boss dimensions will affect the overall installation dimensions of the trunk hinge and the feel of opening and closing the trunk lid. Current technology uses thermoforming, a complex process. In particular, the radius of the intersection of the boss's inner hole and the plane, as well as the tube wall thickness, often fail to meet standardized requirements, resulting in inconsistent product quality, high scrap rates, and low production efficiency. Summary of the Invention

[0003] To address the technical problems existing in the prior art, this invention provides a molding process for automotive hinge brackets, which produces products with stable quality, meets standardization requirements, and has high production efficiency.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] A molding process for an automotive hinge bracket includes the following steps:

[0006] Step 1, cutting the material, which involves using a cutting machine to cut the steel plate into rectangular pieces;

[0007] Step 2: Stretch out a boss at a fixed point on the sheet material;

[0008] Step 3: Stretch the boss from the previous process again, keeping the diameter the same but reducing the height;

[0009] Step 4: Stretch the boss from the previous process again, keeping the diameter the same, and increase the height to the state in step 2.

[0010] Step 5: Stretch the boss from the previous process again, keeping the diameter the same but increasing the height again;

[0011] Step 6: Stretch the small boss from the previous step again, keeping the diameter the same but reducing the height again;

[0012] Step 7: Use a shaping mold to shape the diameter and height of the boss to the final required dimensions of the bracket;

[0013] Step 8: Cut out the outer contour of the bracket using a cutting die;

[0014] Step 9: Use the flanging and shaping mold to fold up the edge from the previous process to the height required by the drawing;

[0015] Step 10: Punch a through hole in the top of the small boss using a punching die;

[0016] Step 11: Shape the diameter of the through hole to the size required by the drawing using the second shaping mold;

[0017] Step 12: Inspect and put the product into storage.

[0018] As a preferred technical solution, in step one, the thickness of the steel plate is 3mm.

[0019] As a preferred technical solution, the size of the cut rectangular sheet is 110mm*100mm.

[0020] As a preferred technical solution, the radius of the intersection of the through hole and the plane inside the boss is less than 2.0 mm, and the wall thickness of the boss is greater than 2.5 mm.

[0021] As a preferred technical solution, the through hole diameter of the boss is 11mm and the height is 9.5mm.

[0022] As a preferred technical solution, in steps two through six, each stretching step uses a corresponding mold.

[0023] As a preferred technical solution, a chamfer is provided at the intersection of the through hole and the top surface of the boss.

[0024] As a preferred technical solution, the overall shape of the car hinge bracket is sock-shaped.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The molding process of the automotive hinge bracket of the present invention, through multiple stretching and shaping, has achieved standardized production requirements, with a pass rate of 99.2%, which is 5% higher than that of thermoforming. The production capacity has also increased from 5,600 pieces / shift to 8,000 pieces / shift, thus improving production efficiency. Attached Figure Description

[0027] Figure 1 is a structural schematic diagram of the automotive hinge bracket in this invention;

[0028] Figure 2 is a cross-sectional view of the car hinge bracket of the present invention along the AA direction in Figure 1.

[0029] In the diagram: 1. Boss; 2. Through hole. Detailed Implementation

[0030] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0031] A molding process for an automotive hinge bracket includes the following steps:

[0032] Step 1, cutting the material, which involves using a cutting machine to cut the 3mm thick raw material steel plate into rectangular pieces measuring 110mm*100mm.

[0033] Step 2: A boss 1 is stretched out at a fixed part of the sheet using the first pre-stretching die;

[0034] Step 3: The boss 1 from the previous process is stretched again using the second pre-stretching mold, with the diameter remaining the same but the height reduced.

[0035] Step 4: The boss 1 from the previous process is stretched again using the third pre-stretching mold, with the diameter remaining unchanged and the height increased again to the state in step 2.

[0036] Step 5: Stretch the boss 1 from the previous process again using the fourth pre-stretching mold, keeping the diameter the same but increasing the height again.

[0037] Step six: The small boss 1 from the previous step is stretched again using the fifth pre-stretching mold, with the diameter remaining unchanged and the height reduced again;

[0038] Step 7: Use a shaping mold to shape the diameter and height of boss 1 to the final required dimensions of the bracket;

[0039] Step 8: Cut out the outer contour of the bracket using a cutting die;

[0040] Step 9: Use the flanging and shaping mold to fold up the edge from the previous process to the height required by the drawing;

[0041] Step 10: Punch a through hole 2 into the top of the small boss 1 using a punching die;

[0042] Step 11: Shape the diameter of the through hole 2 to the dimensions required by the drawing using the second shaping mold, that is, a diameter of 11mm and a height of 9.5mm, as shown in Figure 1. The radius R at the intersection of the through hole 2 and the plane is less than 2.0mm, and the wall thickness H of the boss 1 is greater than 2.5mm, as shown in Figure 2. A chamfer is set at the intersection of the through hole 2 and the top surface of the boss 1.

[0043] Step 12: Inspect and put the finished car hinge brackets into storage.

[0044] In the aforementioned processing flow, boss 1 is formed through multiple stretching and shaping processes. Particularly noteworthy is the achievement of a shape with an inner diameter of 11mm, a height of 9.5mm, and a wall thickness greater than 2.5mm, achieved using a 3mm thick high-strength steel plate. This is a requirement difficult to meet with similar products. Specifically, achieving the required and stable wall thickness necessitates repeated simulations, calculations, and physical adjustments to identify dimensional variation patterns. Pre-stretching and shaping to approximate the standard requirements, followed by final shaping to achieve the desired dimensions, is essential to meet the specifications outlined in the drawings. Furthermore, this product's processing technology is optimized, resulting in more stable product quality and fulfilling functional requirements.

[0045] As shown in Figure 1, the overall shape of the completed car hinge bracket is sock-shaped.

[0046] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-creative modifications to this embodiment as needed after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A molding process for an automotive hinge bracket, characterized in that, The process includes the following steps: Step 1, material cutting, i.e., cutting the steel plate into rectangular pieces using a cutting machine; Step 2, stretching a boss at a fixed position on the piece; Step 3, stretching the boss from the previous step again, keeping the diameter the same but reducing the height; Step 4, stretching the boss from the previous step again, keeping the diameter the same but increasing the height back to the state in Step 2; Step 5, stretching the boss from the previous step again, keeping the diameter the same but increasing the height back; Step 6, stretching the small boss from the previous step again, keeping the diameter the same but reducing the height back; Step 7, shaping the diameter and height of the boss to the final required dimensions of the bracket using a shaping die; Step 8, cutting out the outer contour of the bracket using a trimming die; Step 9, flanging the edge from the previous step to the height required by the drawing using a flanging shaping die; Step 10, punching a through hole at the top of the small boss using a punching die; Step 11, shaping the diameter of the through hole to the required dimensions of the drawing using a second shaping die; Step 12, inspection and warehousing.

2. The molding process of the automotive hinge bracket according to claim 1, characterized in that, In step one, the thickness of the steel plate is 3mm.

3. The molding process of the automotive hinge bracket according to claim 1, characterized in that, In step one, the size of the cut rectangular piece is 110mm*100mm.

4. The molding process of the automotive hinge bracket according to claim 1, characterized in that, The radius of the intersection of the through hole in the boss and the plane is less than 2.0 mm, and the wall thickness of the boss is greater than 2.5 mm.

5. The molding process of the automotive hinge bracket according to claim 1, characterized in that, The through hole of the boss has a diameter of 11mm and a height of 9.5mm.

6. The molding process of the automotive hinge bracket according to claim 1, characterized in that, In steps two through six, each stretching step uses a corresponding mold.

7. The molding process of the automotive hinge bracket according to claim 1, characterized in that, The intersection of the through hole and the top surface of the boss is chamfered.

8. The molding process of the automotive hinge bracket according to claim 1, characterized in that, The overall shape of the car hinge bracket is sock-shaped.

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