JPH0422515A - Bending die - Google Patents

Abstract

PURPOSE:To obtain the die which can prevent the generation of buckling and can bend in right angle by setting the arm which is supported in pivot freely rotatable to the fixed axis set on the surface plate of the upper die and rotates in introduced followingly to the elavating motion of the stripper plate. CONSTITUTION:When the stripper plate 3 of the surface plate of the upper die holds the blank material 8 on the die block 7, and further the surface plate of the upper die lowers, the stripper plate 3 elavates in resistance to the energizing force of the compressing spring. And it contacts with the end part of the arm 9, and then the arm 9 rotates at the fixed axis 10 as the center following to the elavating motion of the stripper plate 3, operates to the top part of the part 8a projecting in long state of the blank material 8 from the die block 7 and the projecting part 8a of the blank material 8 from the die block 7 is bent. In this time, when the rotating angle of the arm 9 increases, the arm 9 contacts with the blank material 8 while slipping on the blank material 8 to the base end graduately in broad surface so the buckling is prevented because the bending is executed while being pressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a bending die for performing U-shaped and L-shaped bending.

[Prior Art] FIG. 4 is a partially sectional view of a conventional bending die. In the figure, (1) is the upper mold surface plate, (2) is the upper mold surface plate (
1) a punch attached to the bottom surface, (3) a stripper plate attached to the upper mold surface plate (1) via a set screw (4) so that it can move up and down, and (5) a stripper plate (3) Compression spring that always urges downward, (6) is the lower mold surface plate, (7) is the die block attached to the upper surface of the lower mold surface plate (6), (8) is the upper part of the lower mold die block (7) This is a bare board installed in

Next, the operation of the conventional example will be explained.

The bending die configured as described above is attached to a press machine (not shown), and the press machine operates and the upper die surface plate (
1) is lowered, the stripper plate (
3) holds the blank plate (8), and the die block (
The portion (8a) protruding from 7) is bent and processed by being pressed by the punch (2).

Upon completion of the machining, the upper die surface plate (1) rises and returns to its original state as shown in FIG.

[Problems to be Solved by the Invention] In the conventional bending mold as described above, in the case of L-shaped bending in which the blank plate (8) protrudes long from the die block (7) as shown in Fig. 5, the punch ( If the punch width of 2) is short, the blank plate (8
) becomes bent at the waist, and even if the punch width of the punch (2) is made longer, if the depth of penetration of the punch is shallow, there is a problem that the waist becomes bent as shown in FIG. Furthermore, if the depth of the punch (2) is shallow,
The problem was that it was difficult to bend at right angles.

The present invention was made in order to solve the above-mentioned problems.
The purpose of the present invention is to obtain a bending die that does not cause bending even when bent into a letter shape and can be bent at right angles.

[Means for Solving the Problems] A bending die according to the present invention is rotatably supported on a fixed shaft provided on an upper mold surface plate instead of a conventional punch, and as the stripper plate moves upward. It is configured to include an arm that is guided and rotates.

[Function] In the present invention, since an arm is provided that is guided and rotates as the stripper plate moves upward, the stripper plate suppresses the blank on the die block by lowering the upper die surface plate, and further moves the upper die surface plate down. When the stripper plate descends, the stripper plate moves upward under the biasing force of the spring. Accordingly, the arm rotates and acts on the tip of the long protruding portion of the blank plate from the die block, and the long protruding portion of the blank plate from the die block is bent.

[Example 1] Fig. 1 is an embodiment of the present invention, which is a front view partially showing the state before machining of the raw plate, and Fig. 2 is a partially cross-sectional view showing the state of the same embodiment after machining the raw plate. FIG. 3 is a partially sectional front view showing a state in which a raw plate is being processed in the same embodiment.

In the figure, components that are the same as those of the conventional example are given the same reference numerals, and explanations of duplicated components will be omitted. (9) is an arm guided by the vertical movement of the stripper plate (3) with rounded corners, (10) is a fixed shaft that rotatably supports arm (9), and (11) is arm ( 9) is a tension spring that returns it to the state before processing, (12) is a tension spring (11)
The block (13) that holds the is a connecting rod that connects the tension spring (11) to the arm (9) and block (12), respectively, and has a threaded tip.

Next, the operation of the above embodiment will be explained.

When the upper die surface plate (1) descends, the stripper plate (3) first presses the blank plate (8) on the die block (7),
When the upper die surface plate (1) further descends, the stripper plate (3) moves upward against the biasing force of the compression spring (5). Then, the arm (9) comes into contact with the end of the arm (9), and then the arm (9) rotates around the fixed shaft (10) as the stripper plate (3) moves upward, and the die block of the blank plate (8) is rotated. (
7) acts on the tip of the long protruding part (8a),
The part of the raw plate (8) protruding from the die block (7) (
8a) is folded.

At this time, when the rotation angle of the arm (9) increases, the rotation angle of the arm (9) increases.
) slides on the blank plate (8) and contacts the blank plate (8) over a gradually wider area toward the base end, and bends while pressing as shown in Fig. 3, thereby preventing bending. Also,
Since the arm (9) holds down the blank (8) until the processing is completed, the squareness of the blank (8) bent into an L-shape increases.

In the above embodiment, the case where the blank plate (8) is bent into an L-shape has been described, but if another set of the above mechanisms is installed on the opposite side, the blank plate (8) can be bent into an L-shape.
8) U-shaped bending becomes possible.

Furthermore, by attaching a hole punch to the tip of the arm (9), it is possible to punch a hole in a shape already bent into an L-shape or a U-shape using a similar mechanism.

[Effects of the Invention] As described above, according to the present invention, an arm that is guided and rotates as the stripper plate moves upward is provided, and after the stripper plate presses the blank on the die block, the arm moves on the stripper plate. The arm rotates as the die block moves, and the arm gradually bends over a wider area from the tip to the base of the long protruding part of the die block of the blank plate, which reduces the occurrence of bends in the blank plate. This has the effect that it is possible to prevent this, and to obtain highly accurate squareness.

[Brief explanation of drawings]

Fig. 1 is a partially cross-sectional front view of an embodiment of the present invention, showing the state before blank processing, and Fig. 2 is a partially cross-sectional front view of the same embodiment, showing the state after processing of the blank board is completed. , Fig. 3 is a partially cross-sectional front view of the same embodiment during processing, Fig. 4 is a partially cross-sectional front view of the conventional bending die, and Figs. 5 and 6 are its front views. It is a front view which shows an example at the time of completion of processing, respectively. In the figure, (1) is the upper mold surface plate, (3) is the stripper plate, (5) is the compression spring, (6) is the lower mold surface plate, (7)
indicates a die block, (9) indicates an arm, and (lO) indicates a fixed axis. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] The die block is fixed to the lower die surface plate, the stripper plate is attached to the upper die surface plate so as to be able to move up and down and is constantly urged downward by a spring, and the stripper plate is rotated by a fixed shaft provided on the upper die surface plate. A bending die, characterized in that the bending die is provided with an arm that is pivotably supported and rotates guided by the upward movement of the stripper plate.