Drawing process for avoiding wrinkling of front door inner panel drawing die

Abstract

This invention relates to a drawing process for avoiding wrinkling during the drawing of the front door inner panel, and relates to the technical field of automobile manufacturing. The drawing process for avoiding wrinkling during the drawing of the front door inner panel of this invention includes the following steps: (1) preparing the front door inner panel body, and forming sidewalls defined by the drawing process punch and the parting line of the pressure ring around the front door inner panel; (2) the sidewall corresponding to the lower flange surface of the front door inner panel door lock is a wavy punch sidewall. This invention designs the process for the easily wrinkled position on the lower flange surface of the front door inner panel door lock as a wavy punch sidewall, which can effectively control the material flow direction, improve the wrinkling phenomenon caused by uneven feeding on the lower side of the front door inner panel door lock, and does not affect the material utilization rate of the part, thereby achieving a significant improvement in the quality of the part at the aforementioned position.

Description

Technical Field

[0001] This invention relates to the technical field of automobile manufacturing, and more specifically, to a drawing process for avoiding wrinkling in the drawing die of the inner front door panel. Background Technology

[0002] During the molding process of the inner front door panel of a car, wrinkling defects are very common at the flange surface on the lower side of the door lock. The surface quality requirements for this flange surface of the inner front door panel are very strict because the wrinkled area affects the edge binding quality between the inner and outer front door panels. Figure 1-2 The diagram shows the lower side structure of the front door inner panel lock prepared by the existing process. Due to uneven forming amount, it causes stretching and wrinkling, which affects the surface quality of the flange surface. Summary of the Invention

[0003] To address the aforementioned technical problems in the prior art, the present invention aims to provide a drawing process and preparation method for avoiding wrinkling of the front door inner panel drawing die.

[0004] The present invention provides a drawing process for avoiding wrinkling of the front door inner panel during drawing, characterized by comprising the following steps:

[0005] (1) Prepare the front door inner panel body, and form sidewalls around the front door inner panel defined by the drawing process punch and the pressure ring parting line;

[0006] (2) The side wall corresponding to the lower flange surface of the door lock on the inner panel of the front door is a wavy punch side wall.

[0007] The distance between the crest and trough corresponding to the orthographic projection of the sidewall of the wave-shaped punch is 25mm, and the distance between the crests is 145mm.

[0008] The peaks and troughs of the wave have rounded corners.

[0009] The radius of the rounded corner structure is 50mm.

[0010] The included angle of the planar wave corresponding to the orthographic projection of the sidewall of the wave-shaped punch is 90° to 150°.

[0011] Compared with the prior art, the drawing process of the present invention that avoids wrinkling of the front door inner panel drawing die has the following beneficial effects:

[0012] This invention designs the wrinkle-prone area on the lower flange of the door lock in the inner panel of the front door as a wave-shaped punch sidewall. This effectively controls the material flow, improves the wrinkling phenomenon caused by uneven feeding on the lower side of the door lock in the inner panel of the front door, and does not affect the material utilization rate of the part, thereby achieving a significant improvement in the quality of the part in the aforementioned location. Attached Figure Description

[0013] Figure 1 A schematic diagram of the structure of the lower side of the door lock on the inner panel of the front door, prepared using existing technology.

[0014] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure along the AA direction.

[0015] Figure 3 This is a schematic diagram of the structure of the front door inner panel prepared in Example 1.

[0016] Figure 4 for Figure 3 Enlarged structural diagram of the circled part.

[0017] Figure 5 for Figure 3 A diagram showing the dimensions of the circled area.

[0018] Figure 6 for Figure 4 A schematic diagram of the cross-sectional structure along the BB direction.

[0019] Figure 7 for Figure 4 A schematic diagram of the cross-sectional structure along the CC direction.

[0020] Figure 8 This is a partial enlarged view of the lower side of the door lock on the inner panel of the front door prepared in Example 2.

[0021] Figure 9 This is a dimensioned diagram of the lower side of the door lock on the inner front door panel prepared in Example 2.

[0022] Figure 10 for Figure 8 A schematic diagram of the cross-sectional structure along the DD direction.

[0023] Figure 11 for Figure 8 A schematic diagram of the cross-sectional structure along the EE direction. Detailed Implementation

[0024] The following detailed description, in conjunction with the accompanying drawings, describes the drawing process for avoiding wrinkling of the front door inner panel according to the present invention. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings.

[0025] Example 1

[0026] In this embodiment, the process involves using a wavy curve for draft molding the wrinkled area below the door lock on the inner front door panel, forming a shape as shown below. Figure 3-7The wavy punch sidewall shown has a wave-shaped profile. The distance between the crest and trough of the wave-shaped punch sidewall, as shown in the orthographic projection, is 25mm, and the distance between the crests is 145mm. There is a rounded corner structure with a radius of 50mm between the crests and troughs. The included angle of the planar wave corresponding to the orthographic projection of the wavy punch sidewall is 120°. At the trough, the width between parting line position 1 and trimming line position 2 is 35mm. At the crest, the width between parting line position 1 and trimming line position 2 is 60mm. The process of this embodiment can effectively control the sheet metal flow direction, avoiding wrinkling caused by uneven feeding on the lower side of the front door inner panel lock, thereby improving product quality.

[0027] Example 2

[0028] In this embodiment, the process involves using a wavy curve for draft molding the wrinkled area below the door lock on the inner front door panel, forming a shape as shown below. Figure 8-11 The wavy punch sidewall shown has a wave-shaped profile. The distance between the crest and trough of the sidewall, as shown in the orthographic projection, is 25mm, and the distance between the crests is 145mm. There is a rounded corner structure with a radius of 50mm between the crests and troughs. The included angle of the planar wave corresponding to the orthographic projection of the wavy punch sidewall is 135°. At the trough, the width between parting line position 1 and trimming line position 2 is 35mm. At the crest, the width between parting line position 1 and trimming line position 2 is 60mm. The process of this embodiment can effectively control the sheet metal flow direction, avoiding wrinkling on the lower side of the front door inner panel lock due to uneven feeding, thereby improving product quality.

[0029] For those skilled in the art, the specific embodiments are merely illustrative descriptions of the present invention. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention are within the protection scope of the present invention.

Claims

1. A drawing process for avoiding wrinkling in a front door inner panel draw die, characterized by Includes the following steps: (1) Prepare the front door inner panel body, and form sidewalls around the front door inner panel defined by the drawing process punch and the parting line of the pressure ring; (2) The side wall corresponding to the lower flange surface of the door lock in the inner panel of the front door is a wave-shaped punch side wall; the distance between the peak and the trough of the wave-shaped punch side wall is 25mm and the distance between the peaks is 145mm; the included angle of the plane wave corresponding to the orthographic projection of the wave-shaped punch side wall is 90°~150°.

2. The draw process to avoid wrinkling of the front door inner panel draw die of claim 1, wherein: The crests and troughs have rounded corners.

3. The drawing process for avoiding wrinkling of the front door inner panel drawing die according to claim 2, characterized in that: The radius of the rounded corner structure is 50mm.

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