JPH0661582B2 - Metal plate bending machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bending apparatus for a metal plate, which is suitable for mainly manufacturing a decorative plate for audio equipment and miscellaneous goods.

[Conventional technology]

2. Description of the Related Art Conventionally, as shown in FIG. 5 and FIG. 6, as a device for performing bevel bending of a decorative plate, for example, the device shown in FIG. 5 and FIG. 6 is known.

That is, in the figure, 11 is a base, 12 is a fixed lower mold having a substantially step-shaped molding surface horizontally arranged on the base 11, and 13 is a fluid pressure cylinder 14 above the fixed lower mold 12. The upper die holder 15 and 16 are arranged so as to be able to move up and down through the movable upper die 15 and the spring pad which are arranged side by side downward on the lower surface of the upper die holder 13, and the movable upper die 15 is a fixed lower die 12. The spring pad 16 is formed to have a similar shape to match the lower surface and the inclined surface of the molding surface, and the spring pad 16 is formed to match the upper surface of the fixed lower mold 12.

In the bending apparatus configured as described above, as shown in FIG. 5, first, the plate A having a required length is placed on the molding surface with the upper surface of the fixed lower mold 12 as a base. After that, the fluid pressure cylinder 14 is operated to lower the upper die holder 13, and the plate A is fixed by the spring pad 16 to the lower die.
The upper upper surface of 12 is pressed and held, and the movable upper die 15 is further lowered while contacting the plate A to be processed. Then, the work plate A is gradually bent as the movable upper die 15 descends, and the bending work of the work plate A is completed when the movable upper die 15 reaches the bottom dead center (see FIG. 6). When the bending of the plate A to be processed is completed, the upper cylinder holder is operated by the operation of the fluid pressure cylinder 14.
13 is moved up, and the movable upper die 15 and the spring pad 16 are returned to the original state.

Thereafter, the plate A to be processed is sequentially bent in the same manner.

[Problems to be solved by the invention]

The above-mentioned conventional bending apparatus can easily bend the required work plate A with a simple structure, but on the other hand, one end of the work plate A is pressed and held by the spring pad 16, and the movable upper die 15 is held. Since the bending is performed by contacting the free end side and rubbing, pressing downward and pressingly contacting the fixed lower die 12, there are the following drawbacks.

First of all, scratches and shock lines caused by rubbing of the movable upper die 15 are likely to occur on the upper surface of the plate A to be processed, and moreover, the so-called shock line linearly appears at a position deviated from the bending point,
The outer surface of the plate A to be processed is damaged.

Secondly, since the movable upper die 15 abuts against the plate A to be processed and presses it downward while rubbing it, the abutting portion of the movable upper die 15, that is, the corner of the molding surface is inevitably R-shaped. It is necessary to make a sharp bending process.

Thirdly, when there is a hole in the bending portion of the plate A to be processed, uneven pressing force of the movable upper die 15 is applied, and bending without distortion is very difficult.

The present invention solves all the problems of the prior art, and enables not only reliable bending without causing scratches and linear scratches associated with shock lines, but also when processing a plate having a hole. Another object of the present invention is to provide a convenient bending apparatus that can perform bending processing suitably.

[Means for solving problems]

That is, according to the present invention, the first spring pad 23 having the same height and the fixed lower mold 22 having a required shape are arranged side by side on the base 21 at a predetermined interval and above the first spring pad 23. A movable upper die 27, a second spring pad 29 is provided above the fixed lower die 22 so as to be vertically movable via an upper die holder 25, and the first spring pad 23 and the movable upper die are Reference numeral 27 denotes a structure in which the work plate A is held and lowered, and is gradually mounted on the base 21 and the upper mold holder 25 via slide mechanisms 24 and 28 so as to slide in synchronization in the direction of the fixed lower mold 22 gradually. .

[Operation] After the plate A to be processed is mounted between the first spring pad 23 and the fixed lower die 22, the movable upper die 27 and the second spring pad
29 is moved down synchronously, one end of the plate A to be processed is pressed and held on the fixed lower mold 22 by the second spring pad 29, and the movable upper mold 27 is brought into contact with the other end of the plate A to be processed. Then, the work plate A is moved to the movable upper die 27 and the first spring pad 23.
The movable upper die 27 while further lowering the movable upper die 27 against the bias of the first spring pad 23, and gradually sliding the movable upper die 27 together with the 1 spring pad 23 in the direction of the fixed lower die 22 by the slide mechanisms 24 and 28, respectively. Perform the required bending process.

〔Example〕

An embodiment of the present invention shown in the drawings will be described below.

21 is a base, 22 is a fixed lower mold having an inclined molding surface horizontally disposed at one end on the base 21 at the upper end corner, and 23 is a fixed lower mold 22 at the other end of the base 21. The first spring pads 23 are arranged at the same high level with an interval of, and the first spring pads 23 are slidable in the direction of the fixed lower mold 22 through the slide mechanism 24. Reference numeral 25 is an upper die holder disposed above the base 21 via a fluid pressure cylinder 26 so as to be movable up and down, and 27 is provided on the upper die holder 25 via a slide mechanism 28 so as to correspond to the first spring pad 23. It is a movable upper mold that is mounted downward. Reference numeral 29 denotes a second spring pad held by the upper die holder 25 corresponding to the fixed lower die 22.
The lower end of the spring pad 29 is located at the same level as the lower end of the movable upper die 27.

Next, the operation of the bending apparatus according to the present invention will be described.

First, the metal plate A to be processed is placed between the first spring pad 23 and the fixed lower die 22 (see FIG. 1). After that, the upper die holder 25 is activated by the operation of the fluid pressure cylinder 26.
And the one end of the plate A to be processed is pressed and held on the upper surface of the fixed lower mold 22 by the second spring pad 29, and the movable upper mold 27 is brought into contact with the other end of the plate A to be processed. Then, the plate A to be processed is moved to the upper mold 27 and the first spring pad 23.
The movable upper die 27 while further lowering the movable upper die 27 against the urging force of the first spring pad 23.
Along with 23, the slide mechanisms 24 and 28 respectively slide the fixed lower mold in the 22 direction synchronously. Then, the plate A to be processed is gradually bent while being held between the movable upper die 27 and the first spring pad 23 (see FIG. 2). Then, when the movable upper die 27 reaches the bottom dead center, the plate A to be processed is pressed against the molding surface of the fixed lower die 22 to complete the bending process (third step).
See figure). At this time, since the plate A to be processed is bent while both ends are clamped and without being pulled or pushed between the both ends, the upper and lower bending points of the plate A to be processed are shock lines. Surely matches.

When the bending of the work plate A is completed, the fluid pressure cylinder 26
The upper plate holder 25 is raised by the operation of
Unravel. At this time, the first and second spring pads 23, 29 are restored to their original state with time by a required control member (not shown). When the upper die holder 25 reaches the top dead center, the first spring pad 23 and the movable upper die 27 are returned to the original state by the operation of the slide mechanisms 24 and 28. Thereafter, the bending of the plate A to be processed is sequentially performed in the same manner.

Although the above embodiment shows an example of the oblique bending apparatus for the plate A to be processed, the present invention is not limited to this and can be applied to a bending apparatus having a shape similar to this. .

〔The invention's effect〕

According to the present invention, the first spring pad 23 and the fixed lower die 22 having the same shape are arranged side by side on the base 21 at a predetermined interval on the base 21, and the first spring is provided. A movable upper die 27 is disposed above the pad 23, and a second spring pad 29 is disposed above the fixed lower die 22 so as to be vertically movable via an upper die holder 25, and the first spring pad 23 described above is also provided. The movable upper die 27 is attached to the base 21 and the upper die holder 25 via the slide mechanisms 24 and 28, respectively, so that the movable work die 27 holds the work plate A and descends while gradually sliding in synchronization in the direction of the fixed lower die 22. Therefore, the movable upper die 27 is lowered against the urging force of the first spring pad 23 while the both ends of the plate A to be processed are pressed and held, and the 1 spring pad 23 is gradually
Along with the fixed lower die, it can be slid synchronously in the direction of 22 to perform the required bending work. Bending work can be performed without pushing or pulling the work plate A during bending work as in the conventional case. As a result, the shock line does not appear anywhere other than the curved portion and it is not rubbed by the mold, so there are no scratches, and while maintaining the surface of a beautiful decorative plate etc. It can be bent. Further, even in the case of a plate having a hole, it is possible to suitably perform bending without causing distortion or deformation in the vicinity of the hole.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a side view, FIGS. 2 and 3 are side views showing an operating state, and FIG. 4 is a cross section taken along line 1-1 of FIG. 5 and 5 are side views showing a conventional example, and FIG. 6 is a side view showing the same operating state. 21 …… Base, 22 …… Fixed lower mold, 23 …… First spring pad, 24 …… Slide mechanism, 25 …… Upper mold holder, 27…
… Movable upper mold, 28 …… Slide mechanism, 29 …… Second spring pad, A …… Work plate.

Claims (1)

[Claims] 1. A first spring pad 23 and a fixed lower mold 22 having the same shape are arranged side by side on a base 21 at a predetermined interval, and above the first spring pad 23. Is a movable upper die 27, and a second spring pad 29 is arranged above the fixed lower die 22 so as to be vertically movable via an upper die holder 25, and the first spring pad 23 and the movable upper die 27 are Holds the plate A to be processed and moves downward while gradually fixing the lower mold 22
A metal plate bending apparatus characterized in that it is mounted on a base 21 and an upper die holder 25 via slide mechanisms 24 and 28 so as to slide in synchronization with each other.