JPS62151225A - Bending metal die - Google Patents

Abstract

PURPOSE:To lessen the move of a work and to reduce bending flaws by working the work by turning the rotary tool fitting a pad according to the descent of the upper die holder after pressing the work by the pad and the die in the shape corresponding to the bending radius. CONSTITUTION:A pad 15 abuts on a work 1 when placing the work 1 on a die 28 and descending the upper die holder 13. With the further descent of the upper die holder 13, the holding block 26 at the upper part of a rotary tool 19 abuts on the rotary tool 19, pushes down the rotary tool 19 and rotates it centering around a shaft 21. The bending is completed by stopping the turn with the upper holder 13 abutting on the rotary tool 19 with further descent of the upper holder 13. The spring-back of the bending angle is reduced with a bottomed punch 18 hammering the work part of the work 1 with further descent of the upper die holder 13.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a bending die used for bending thin plates.

Conventional technology In recent years, various improvements have been made in bending thin plates, such as improving the material of bending tools and improving surface treatment. However, pickpocket salt is generated on the surface of the workpiece during bending. , the appearance was deteriorating.

As an example, a sectional view of a conventional bending die will be explained in FIG. Here, 1 is a workpiece. 2 is a die, which is attached to the lower mold holder 9 with bolts 12.

3 is a punch, which is attached to the upper mold holder 8 with bolts 11. 4 is a pad, which is suspended from the upper die holder 8 with a hanging bolt 5.

6 is a guide pin that guides the pad 4, 7 is the pad 4
10 is a guide post that guides the upper mold holder 8.

Next, the operation based on the above configuration will be explained. When bending the workpiece 1 into the shape shown in FIG. 9, the workpiece 1 is first placed on the die 2 and the upper die holder 8 is lowered. Then, the pad 4 first hits the workpiece 1, and when the upper mold holder 8 is further lowered, the punch 3 hits the workpiece 1 as shown in FIG. 8, and the punch 3 pushes down the workpiece 1. To go. At this time, the workpiece 1 does not follow the bending R of the die 2. When the upper mold holder 8 is further lowered, the punch 3 sandwiches the workpiece 1 between the die 2 and the bottom dead center as shown in FIG. As a result, the workpiece 1 is pressed against the R of the die 2.

Problems to be Solved by the Invention However, at this time, the punch 3 sandwiches the workpiece 1 with the side surface of the die 2 and hits the workpiece 1 with the punch 3 while restraining the workpiece 1. As the workpiece 1 moves near the bottom dead center, strong scratches remain on the workpiece 1. Furthermore, this movement of the workpiece 1 causes a bending springback in the workpiece 1, resulting in a disadvantage that the bending angle of the workpiece 1 becomes worse.

In other words, the cause of the bending damage on the workpiece 1 is that the workpiece 1 is moved while being sandwiched between the punch 3 and the die 2, as can be seen from the above configuration. There is. On the other hand, the cause of the poor bending angle is that when striking with the punch 3 and die 2 at the bottom dead center, the workpiece 1 is struck while moving slightly, making it difficult to determine the bending angle.

Therefore, an object of the present invention is to solve such problems.

Means to solve problems In order to solve the above problems, the bending die of the present invention is provided.

an upper mold holder, a lower mold holder having a die shaped to correspond to the bending radius of the workpiece, and the upper mold holder is attached to the upper mold holder with a hanging bolt, and the workpiece can be held down by the force of a first spring. a rotary tool that is attached to the pad and is rotatable about an axis located at the center of the bending radius of the workpiece when the pad presses the workpiece; A second spring is attached to the upper die holder and a second spring that lifts the rotary tool upward to prevent it from rotating. It is equipped with a contact block that rotates to bend the workpiece.

According to the above-described structure, the present invention presses the workpiece with the pad and the die along the bending radius, and then presses the rotary tool, which is attached to the pad and rotates along the bending radius, as the upper mold holder descends. Since the workpiece is rotated and processed, there is little movement of the workpiece near the bottom dead center, resulting in fewer scratches, and the workpiece can be processed without deteriorating the accuracy of the bending angle.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

FIG. 1 is a sectional view of an embodiment of the present invention. here 13
14 is an upper die holder, and 14 is a hanging bolt that suspends the pad 15. 1 is a workpiece pressed by a pad 15, 16
is a guide pin guiding the pad 15.

17 is a compression spring that presses down the pad 15. A bottom punch 18 is fixed to the upper mold holder 13.

(2) A rotary tool 9 is attached to the shaft 21 so that it can rotate at a radius approximately equal to the outer diameter of the bending radius of the workpiece 1. The shaft 21 is supported at both ends by shaft brackets 20. Shirt 1 to bracket 20 are fixed to both ends of pad 15. 22 is a tension spring for pulling up the rotary tool 19; 23 is a spring bracket to which the tension spring 22 is attached, and is fixed to both ends of the pad 15. A first spring hook 24 is attached to the spring bracket 23 and hangs the tension spring 22, and a second spring hook 25 is attached to the rotary tool 19. Reference numeral 26 denotes an abutment block which is rotated by contact with the rotary tool 19, and is attached to the upper mold holder 13 with bolts 27. A die 28 has a shape corresponding to the inner diameter of the bending radius of the workpiece 1, and is fixed to a lower mold holder 29 facing the upper mold holder 13 with bolts 30. 31 is a guide post that guides the upper die holder 13 and the lower die holder 29.

Next, the operation of the bending die configured as described above is
- Explanation will be made based on FIG.

In Figure 1, with the mold open, the workpiece 1 is first inserted into the die 28.
Place it on top. Next, when the upper mold holder 13 is lowered,
The pad 15 hits the workpiece 1. Furthermore, upper mold holder 1
3 is lowered, the contact block 26 located above the one-rotation tool 19 hits the rotary tool 19, as shown in FIG. 2. This pushes down the rotary tool 19, and the rotary tool 19 is rotated about the shaft 21. When the upper mold holder 13 is further lowered, this upper mold holder 1
3 comes into contact with the rotary tool 19, but no force is applied in the direction of one rotation, and one rotation is stopped and the bending process is completed.

When the upper die holder 13 further descends, the bottoming punch I8 formed to match the required bending outer diameter of the workpiece 1 strikes the bending part of the workpiece 1, and the workpiece 1 connects to the die 28 and the bottom. Finally, when all the machining is completed, the result will be as shown in Figure 3.

Next, when raising the upper mold holder 13, first the bottom punch I
8 goes up, then the hit block 26 goes up.

When the upper die holder 13 is further raised, the rotary tool 19 is pulled up by the spring 22, and when the upper die holder 13 is further raised, the pad 15 no longer presses the workpiece 1, completing one cycle.

Effects of the Invention As described above, according to the present invention, since the tool is rotated along the bending radius of the workpiece in thin plate bending, there is little movement of the workpiece near the bottom dead center of the process, and the workpiece is bent. Fewer scratches. Also, regarding the bending angle, the movement of the workpiece near the bottom dead center is reduced and the tool strikes the workpiece.
There is little springback at the bending angle.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a bending die in an embodiment of the present invention;
Fig. 2 is a sectional view of the processing process in Fig. 1, Fig. 3 is a sectional view at the bottom dead center in Fig. 1, Fig. 4 is a plan view of the upper die, Fig. 5 is a plan view of the lower die, Figure 6 is a sectional view of a conventional bending die, Figure 7 is a sectional view at the bottom dead center in Figure 6, and Figure 8 is a sectional view of a conventional bending die.
The figure is a sectional view of the processing process in FIG. 6, and FIG. 9 is a perspective view of a product processed with a conventional bending die. 1...Work material, 13...Upper mold holder, 15...
·pad. 17... Compression spring (first spring), 19... Rotating tool, 22... Tension spring (second spring), 26...
Abutment block, 28...Die, 29...Lower die holder representative Yoshihiro MorimotoFigure 1/---Mf) Rossi↓g
5----Utef 0. -+713-----Eng! Kakimoto 1
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Claims (1)

[Scope of Claims] 1. A bending die for bending a thin plate-shaped workpiece by vertical movement, comprising an upper die holder and a lower die holder having a die shaped to correspond to the bending radius of the workpiece. and,
a pad that is attached to the upper mold holder with a hanging bolt and capable of holding down the workpiece by the force of a first spring; A rotary tool that can rotate around an axis located at the center of the bending radius of the workpiece, and a second tool that lifts the rotary tool upward to prevent it from rotating under its own weight.
A spring is attached to the upper die holder, and when the upper die holder descends and the pad sandwiches the workpiece with the die, the rotary tool is rotated to bend the workpiece. A bending mold characterized by being equipped with a pressing block. 2. The upper die holder is formed to match the required bending outer diameter of the workpiece and is equipped with a bottom punch that strikes the workpiece at the bottom dead center of processing. Bending mold described in section.