CN101347806A - Oblique negative angle bending die structure - Google Patents

Abstract

The present invention discloses an oblique negative-angle bending die structure, which is used for stamping and bending products with negative angles. The structure includes: an upper die, which includes an upper splint, on which a driving punch is arranged, A section of the downward space at the lower end of the upper clamping plate is provided with a stopper plate, and a stripper plate is provided at the lower end of the stopper plate, and an oblique accommodation groove is arranged at the lower end of the above-mentioned driving punch in the stripper plate, and an inclined accommodating groove is arranged inside the stripper plate. to the forming punch; the lower die, which includes a lower template, and a forming slider is movable in the lower template, and one side of the forming slider is a bending bevel, which is the same as the above-mentioned oblique forming punch One side is parallel, a first ejector pin is arranged under the forming slider, and a second ejector pin is arranged under the lower mold corresponding to the above-mentioned oblique accommodation groove. Utilizing this structure, products with larger negative angles can be bent, bending costs are reduced, bending instability factors are reduced, product quality is further guaranteed, mold matching time is shortened, and mold life is prolonged.

Description

Oblique negative angle bending die structure

【Technical field】

The invention relates to a bending die structure, in particular to an oblique negative angle bending die structure.

【Background technique】

When we make portable device casings such as personal digital assistants (PDAs) and mobile phones, we often encounter situations such as negative bending angles (usually we call the angles with a bending angle greater than 90° negative angles). As shown in Fig. 1, Fig. 1 shows the side view of the negative angle bending die structure of the prior art. Set the product 100 on the lower mold insert 300. After the product 100 is folded at an angle (the angle shown by the dotted line in Figure 1), the vertical wrapping angle of the punch 200 is used to forcibly form a negative angle of about 10°. When When the negative angle is greater than 15°, the traditional method is difficult to achieve the ideal goal, and the structure is not perfect, so other methods need to be adopted.

The traditional structure using the above-mentioned prior art has the following disadvantages: the negative angle cannot be too large; the bending cost is high (two-step forming is required); The flatness of the product 100 exceeds the standard; the height of the punch 200 requires very precise mold matching, which requires high mold technology. If the mold is not matched correctly, the lower mold insert 300 often bursts.

【Content of invention】

Therefore, the object of the present invention is to provide an oblique negative angle bending die structure, which can solve the problem of angle limitation, reduce bending cost, reduce the occurrence of bending instability factors, and further ensure the quality of products ; Shorten the mold matching time and prolong the life of the mold.

In order to achieve the above purpose, the oblique negative angle bending die structure of the present invention can be used for stamping and bending the negative angle of products, and the structure includes:

An upper die, which includes an upper splint, a driving punch is arranged on the upper splint, a stop plate is provided at a section of the downward space at the lower end of the upper splint, and a stripper plate is provided at the lower end of the stop plate, inside the stripper plate An oblique accommodating groove is provided at the lower end of the driving punch, and the oblique accommodating groove is provided with an oblique forming punch;

The lower mold includes a lower template. A forming slider is movable in the lower template. One side of the forming slider is a bending bevel, and the bending bevel is parallel to the side of the above-mentioned oblique forming punch. A first ejector pin is arranged under the forming slide block, and a second ejector pin is arranged under the lower mold corresponding to the above-mentioned oblique accommodating groove.

Compared with the prior art, the oblique negative angle bending die structure of the present invention utilizes this structure, the forming slider is pressed into the lower formwork by the stripper plate during the mold closing, and the oblique forming punch is also pressed by the second ejector pin Fully push into the stripper plate, retain the product to be formed, enter the forming state, and start forming. When the mold continues to close, the punch will continue to move downward, thereby pushing the oblique forming punch along the direction of the oblique accommodation groove in the stripper plate. Downward, perform bending action, return to the original road after completing the action, and realize the large-angle bending action of the product. In order to solve the problem of angle limitation, products with larger negative angles can be bent, the cost of bending can be reduced (only one step of forming is required), the occurrence of unstable factors in bending can be reduced, the quality of products can be further guaranteed, and the mold matching can be shortened. Time, extended mold life, etc.

In order to have a further understanding of the purpose of the present invention, structural features and functions thereof, the detailed description is as follows in conjunction with the accompanying drawings:

【Description of drawings】

FIG. 1 is a side view of a negative-angle bending die structure in the prior art.

Fig. 2 is a cross-sectional view of a preferred embodiment of the oblique negative-angle bending mold structure of the present invention, before the mold is closed.

Fig. 3 is a side view sectional view of a closed mold of a preferred embodiment of the oblique negative angle bending mold structure of the present invention.

Fig. 4 is a side view sectional view of a preferred embodiment of the oblique negative angle bending mold structure of the present invention after the mold is closed.

【Detailed ways】

Please refer to Fig. 2, Fig. 3 and Fig. 4 together, which are respectively shown as a cross-sectional view of the oblique negative angle bending mold structure of the present invention before closing the mold, and a closed mold side of the oblique negative angle bending mold structure of the present invention The sectional view of the visual state, the sectional view of the side view state after the oblique negative angle bending die structure of the present invention is closed.

In order to achieve the above purpose, the oblique negative angle bending die structure of the present invention can be used for stamping and bending the negative angle of products, and the structure includes:

A patrix 1, it comprises a patrix 14, and this patrix 14 lower end is provided with an upper splint 13, and this upper splint 13 is provided with a driving punch 15, and this upper splint 13 lower end section descending space 12 places is provided with a stopper. A baffle 11, the lower end of the baffle 11 is provided with a stripping plate 10, the stripping plate 10 is provided with an oblique accommodation groove 16 at the lower end of the driving punch 15, and the oblique accommodation groove 16 is provided with Oblique forming punch 17;

The lower mold 2 includes a lower template 20, the lower end of the lower template 20 is provided with a lower backing plate 21, the lower backing plate 21 is provided with a lower mold base 22, and a molding slide 25 is movable in the lower template 20, the molding slide One side of the block 25 is a bending bevel 250, the bending bevel 250 is parallel to the side of the above-mentioned oblique forming punch 17, a first ejector pin 230 is provided below the forming slider 25, the first ejector pin 230 A first spring 23 is provided at the lower end of the pin 230 , and a second ejector pin 240 is provided at the lower end of the lower mold 2 corresponding to the above-mentioned oblique accommodation groove 16 , and a second spring 24 is provided at the lower end of the second ejector pin 240 .

Use this structure to press and bend the product 3 to be formed. In particular, there is a convex portion 31 on the part 30 to be bent on the product 3 to be formed. Therefore, in this embodiment, the oblique forming punch 17 is provided with a corresponding There is a recess 170 . When the mold is closed, the entire upper mold 1 goes down and closes with the lower mold 2, the first spring 23 and the second spring 24 are compressed, the forming slider 25 is completely pressed into the lower mold plate 20, and the product 3 to be formed is pressed tightly on the stripping plate. Between the plate 10 and the lower template 20, the forming punch 17 is closely matched with the product 3 to be formed, and the product 3 to be formed reaches a good retention before stamping. The down space 12 drives the punch 15 to push the oblique forming punch 17, so as to achieve the purpose of stamping and forming the product.

Compared with the prior art, the oblique negative angle bending die structure of the present invention utilizes this structure, the forming slider 25 is pressed into the lower template 20 by the stripper plate during the mold closing, and the oblique forming punch 17 is also driven by the second The ejector pin 240 is completely pushed into the stripping plate 10, and the product 3 to be formed is retained, enters the forming state, and starts forming. When the mold continues to close, the punch 15 is driven to continue downward, thereby pushing the oblique forming punch 17 along the stripping The oblique accommodating groove 16 in the plate 10 goes down to perform the bending action, and returns to the original path after completing the action to realize the large-angle bending action of the product. In order to solve the problem of angle limitation, products with larger negative angles can be bent, the cost of bending can be reduced (only one step of forming is required), the occurrence of unstable factors in bending can be reduced, the quality of products can be further guaranteed, and the mold matching can be shortened. Time, extended mold life, etc.

Claims (4)

1. An oblique negative-angle bending die structure, which can be used for stamping and bending products with negative angles, is characterized in that the structure includes: An upper die, which includes an upper splint, a driving punch is arranged on the upper splint, a stop plate is provided at a section of the downward space at the lower end of the upper splint, and a stripper plate is provided at the lower end of the stop plate, inside the stripper plate An oblique accommodating groove is provided at the lower end of the driving punch, and the oblique accommodating groove is provided with an oblique forming punch; The lower mold includes a lower template. A forming slider is movable in the lower template. One side of the forming slider is a bending bevel, and the bending bevel is parallel to the side of the above-mentioned oblique forming punch. A first ejector pin is arranged under the forming slide block, and a second ejector pin is arranged under the lower mold corresponding to the above-mentioned oblique accommodating groove. 2. The oblique negative angle bending die structure according to claim 1, wherein a concave portion is further provided on the oblique forming punch. 3. The oblique negative angle bending die structure according to claim 1, wherein a first spring is provided at the lower end of the first ejector pin. 4. The oblique negative angle bending die structure according to claim 1, wherein a second spring is provided at the lower end of the second ejector pin.

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