A method for processing a skin plate member with weight-reducing holes in an inner wall

Abstract

The application discloses a skin plate machining method with weight-reducing holes in inner walls, and belongs to the technical field of plate machining, characterized in that the method comprises the following steps: S1, a machining center is used to perform plane milling machining on a plate-shaped blank, weight-reducing holes and inner side surface grooves are machined on the plate-shaped blank, and a stamping material is prepared; S2, a stamping die is used to perform stamping and bending forming on the stamping material, and a bent plate is prepared; S3, the bent plate is placed on a checking tool, and the bent plate is clamped and fixed, and a shape surface provided with the tool is used as a reference to check the size of the bent plate; and S4, an inner wall curved surface of the bent plate is machined, and a finished product is prepared. The method can significantly improve the machining quality and machining efficiency of the skin plate.

Description

Technical Field

[0001] This invention belongs to the field of sheet metal processing technology, and particularly relates to a method for processing skin sheet metal with weight-reducing holes on the inner wall. Background Technology

[0002] Weight-reduction holes on the inner wall of the skin are a common design technique aimed at minimizing weight while maintaining sufficient strength. The skin is an exposed outer surface part, requiring a defect-free exterior, uniform inner wall thickness, and dimensions conforming to the drawings. Traditional processing methods include: 1) Planar milling: The aluminum plate is first milled with weight-reduction holes, then bent using tooling, followed by surface grinding. 2) Chemical milling: The blank is bent using hot pressing, and then the weight-reduction holes are chemically etched after coating protection.

[0003] The problems with the above-mentioned planar milling are as follows: 1. When the bending fixture matches the edge of the weight-reducing hole on the product, deviations can easily occur, causing localized pressure marks that affect product quality. 2. Due to differences in thickness, the bending stress during product bending causes pits on the edge of the weight-reducing hole. This affects the product's appearance and surface flatness, and is generally removed by manual grinding.

[0004] The problems with chemical milling are: 1. High production costs: Both thermoforming and chemical milling are quite expensive, making it impossible to reduce the overall processing cost. 2. Low production efficiency: Thermoforming requires prolonged heating and preheating. Chemical milling, being a chemically-based etching process, is fundamentally incapable of achieving mass production.

[0005] Currently, the problems with the two processing methods mentioned above directly affect product quality and delivery time, and cannot meet customer needs. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention provides a method for processing skin panels with weight-reducing holes on the inner wall, which solves the problems of difficulty in ensuring quality, low efficiency or high cost in the current processing of skin panels with weight-reducing holes on the inner wall.

[0007] This invention is implemented as follows: a method for processing a skin panel with weight-reducing holes on its inner wall, characterized by comprising the following steps:

[0008] S1. Use a machining center to perform planar milling on the plate blank to machine weight-reducing holes and inner side grooves to obtain stamping material.

[0009] S2. Use a stamping die to stamp and bend the stamping material to form a bent plate.

[0010] S3. Place the bending plate in the calibration fixture and clamp and fix the bending plate. Use the shape surface provided by the fixture as a reference to check the dimensions of the bending plate.

[0011] S4. Process the inner curved surface of the bent plate to obtain the finished product.

[0012] In the above technical solution, preferably, the bending plate is locked and fixed to the surface of the calibration fixture using a shaped pressure block.

[0013] In the above technical solution, preferably, the calibration fixture consists of a lower die base and a side die base fixed to the lower die base. The lower die base has a groove-shaped surface that runs through both end faces of the lower die base. The side die base has a side support plane that is located on the lateral extension surface of the surface. The shaped pressure block is installed on the lower die base and the side die base by bolts.

[0014] In the above technical solution, preferably, the lower end face of the symbolic pressure block forms a stepped pressure surface for pressing the edge of the bending plate, and the symbolic pressure block is disposed around the surface.

[0015] The advantages and effects of this invention application are:

[0016] (1) This processing method combines stamping dies with ordinary machining centers and clamping fixtures. By utilizing the precision of stamping and bending and the matching of fixtures, the problem of pits on the appearance caused by inconsistent material thickness during bending is eliminated, so that the flatness of the appearance after bending reaches less than 0.1mm, which significantly improves the product processing quality.

[0017] (2) Combining stamping and machining processes can increase production efficiency by more than 3 times and reduce processing costs by about 60%.

[0018] (3) Stamping and straightening can ensure the consistency of products and tooling, eliminate the problem of springback and deformation caused by residual temperature after thermoforming, and ensure product quality and stability during processing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the verification fixture in this invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] To address the problems of inconsistent quality, low efficiency, and high cost in the current processing of skin panels with weight-reducing holes on the inner wall, this invention provides a method for processing skin panels with weight-reducing holes on the inner wall. This method can significantly improve the processing quality and efficiency of skin panels. To further illustrate the structure of this invention, a detailed description is provided below in conjunction with the accompanying drawings:

[0022] A method for processing a skin panel with weight-reducing holes on its inner wall, characterized by comprising the following steps:

[0023] S1. Using a machining center, the sheet metal blank is milled to create weight-reducing holes and inner surface grooves, thus producing the stamping material. The blank is milled using a machining center with the required dimensional tolerance of 0.1mm.

[0024] S2. The stamping material is stamped and bent using a stamping die to obtain a bent plate. The bent portion of the bent plate is bent to the theoretical dimensions required by the product. The angular springback during the stamping and bending process can be corrected by subsequent calibration fixtures to achieve the 0.5-degree tolerance required for subsequent processing. The stamping die equipment for bending and stamping flat plates is existing known equipment.

[0025] S3. Place the bending plate in the calibration fixture and clamp it in place. Use the shape of the fixture as a reference to check the dimensions of the bending plate. Use the fixture fixture to place the product on the shape of the fixture. Press the product onto the fixture using a weight that matches the product shape. Then, use a small, matching clamping block to clamp the product onto the fixture. Finally, check the dimensions of the product's clamping position using an alignment method. The allowable range for the product's parallelism and height deviation is within 0.1mm.

[0026] The installation of bending plate 5 in the tooling line is as follows: Figure 1 The calibration fixture consists of a lower die base 1 and a side die base 2 fixed to the lower die base. The lower die base has a groove-shaped surface that runs through both end faces of the lower die base. The side die base has a side support plane, which is located on the lateral extension surface of the groove. A shaped pressure block is installed on the lower die base and the side die base by bolts. The lower end face of the shaped pressure block 3 forms a stepped pressure surface for pressing the edge of the bent plate, and the shaped pressure block is located around the groove. Furthermore, a calibration boss 4 for calibrating the weight reduction hole is provided on the side die base, and the outline of this calibration boss serves as the calibration hole for the weight reduction hole.

[0027] S4. Perform CNC milling on the inner curved surface of the bent plate. A standard three-axis machining center is sufficient. Use an 8mm diameter tool for roughing, a spindle speed of 5000 rpm, and a feed rate of 0.5mm. For finishing, use a 4mm diameter tool to obtain the finished product. After passing inspection, proceed with the inner curved surface machining. During machining, it is necessary to check and compensate for the deviation between the lowest point and the theoretical value. Due to internal stress, the product will experience some angular springback after machining. A calibration fixture can be used for fine-tuning the angle to bring it back to the theoretical dimension. The final machined product has no defects in appearance and the dimensional accuracy meets customer requirements.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for processing a skin panel with weight-reducing holes on its inner wall, characterized in that, Includes the following steps: S1. Use a machining center to perform planar milling on the plate blank to machine weight-reducing holes and inner side grooves to obtain stamping material. S2. Use a stamping die to stamp and bend the stamping material to form a bent plate. S3. Place the bending plate in the calibration fixture and clamp and fix the bending plate. Use the shape surface provided by the fixture as a reference to check the dimensions of the bending plate. S4. Process the inner curved surface of the bent plate to obtain the finished product; The bending plate is locked and fixed to the surface of the calibration fixture using a shaped pressure block; The calibration fixture consists of a lower die base and a side die base fixed to the lower die base. The lower die base has a groove-shaped surface that runs through both end faces of the lower die base. The side die base has a side support plane that is located on the lateral extension surface of the surface. The shaped pressure block is installed on the lower die base and the side die base by bolts. The lower end face of the symbol-shaped pressure block forms a stepped pressure surface for pressing the edge of the bending plate, and the symbol-shaped pressure block is disposed around the surface.

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