JPH0558810B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bending machine, and more specifically, a ram supporting a top die is provided to be able to approach and leave a bottom die fixed to a machine frame, and a plurality of folding machines are provided on one side of the ram or the machine frame. This invention relates to a bending machine equipped with a presser cylinder, a plurality of movable blocks movably provided on the other side, and each of the movable blocks described above can be freely positioned in a position corresponding to the presser cylinder and a position not corresponding to the presser cylinder. .

First, the background of the present invention will be explained with reference to FIGS. 1 and 2.

In the bending machine 1 shown in FIGS. 1 and 2, the machine frame 3 has a gate-shaped configuration, and bottom dies 5, 5 (lower board, lower die, table ) is the center line 7 shown in Figure 2.
They are placed symmetrically apart from each other.

Above the bottom dies 5, 5, top dies 9, 9 are placed at symmetrical positions corresponding to the bottom dies 5, 5.
(Sometimes called upper mold, upper mold, upper plate, etc.)
The ram 11 holding the center line 7 above the machine frame 3
It moves up and down by being driven by a pair of fluid pressure cylinders 13, 13 provided at certain positions.

As shown in FIG. 2, a plurality of protruding columns 15 are provided on the lower central surface of the ram 11, and slope blocks 17, 17 are provided on the surface corresponding to the bottom die 5 of the protruding columns 15 for elevating and lowering the position. It is set up freely.

Bend beams 19, 19 (sometimes referred to as bending dies, bending machines, rotary tables, etc.) are provided between the gradient blocks 17, 17 and the bottom dies 5, 5. Fluid pressure cylinders 21, 21 and eccentric shaft 2 provided below
3, 23 and links 25, 25 to move up and down.

Conventionally, the above-mentioned bending machine 1 was used to bend the plate material 2.
7, the processed part of the plate material 27 is positioned on the bottom die 5 so as to protrude toward the center line 7 side, and the fluid pressure cylinder 13 is driven to press and fix the plate material 27 against the bottom die 5 with the top die 9. was.

When the plate material 27 is pressed against the bottom die 5 at both ends of the top die 9 in this way, a reaction force is applied that bends the top die 9 and the bottom die 5 near the center of the plate material 27 apart, so it is necessary to support the plate material 27 especially in the middle during bending work. The top die 9 was curved in an upwardly convex manner and could not be bent with high precision.

The present invention has been made for the purpose of solving the above-mentioned disadvantages of the conventional apparatus, and preferred embodiments thereof will be described in detail below with reference to the drawings.

The bending machine 1 of the present invention has a plurality of presser cylinders 29 facing downward on the machine frames 3, 3 above the top die 9, at linear positions that coincide with the bending sides of the top die 9 attached below the ram 11. Established.

Further, on the upper surface of the ram 11, there is a short column 31 in which a movable block moving device such as a rotary actuator (not shown) is built in an adjacent portion separated from the plurality of presser cylinders 29 described above.
The horizontal leg 33H of the inverted L-shaped block 33 is rotatably attached to the short column 31.

Vertical legs 33V of the above-mentioned inverted L-shaped block 33
is an example of a movable block, and by driving a rotary actuator (movable block moving device), the corresponding position of the presser cylinder 29 and the distant non-corresponding position where the presser cylinder 29 does not act are changed. and can be occupied as desired.

Further, on the outer surface of the bottom die 5, a detection device 35 such as a limit switch is mounted on the short column 3 as described above.
It is provided at the bottom of the board 27 of No. 1 when viewed from the outside in the loading/unloading direction (see Figure 1).

Further, the presser cylinder 29 described above is provided with two springs 39 on the right end side in FIG. 1, as shown by broken lines, which urge the piston 37 upward. The piston 37 is raised within the cylinder by the bullet 39 to its upper limit.

In the embodiment apparatus of the present invention described in detail above, the plate material 2
A ram 11 that holds a top die 9 that presses and fixes a top die 9 to a bottom die 5 is connected to a plurality of presser cylinders 2.
9 is led from the machine frame 3 through the L-shaped block 33, which is a plurality of movable blocks.
This eliminates the problem of the top die 9 being curved upwardly at the center.

In addition, a detection device 35 for detecting the width of the plate material 27 is provided on the outer side surface of the bottom die 5 through which the plate material 27 is carried in and out, and the L-shaped block 33, which is the movable block described above, is moved to a corresponding position. We also achieved the effect of being able to perform bending with a single load with high precision as shown.

Furthermore, when the fluid pressure guided to the presser cylinder 29 is released, the piston 37 rises to its upper limit due to the biasing force of the bullet 39, and the piston rod 41 protrudes downward from the presser cylinder 29 as shown in FIG. It disappears.

At this time, the fluid pressure cylinder 13 is operated to release the ram 1.
1 has the effect of releasing the fixation of the plate material 27 and creating a clearance that allows the top die 9 to be easily replaced.

In addition, as is clear from FIG. 2, the position where the presser cylinder 29 presses down on the ram 11 via the L-shaped block 33, which is a movable block, is provided above the bending center point of the top die 9. This also had the effect of keeping the curvature of the top die 9 to a minimum.

In the above detailed explanation, the symmetrical bending machine 1 as shown in FIG. Ram 11
It is clear that it is also possible to provide the L-shaped block 33, which is a movable block, on the machine frame 3.

It is also clear that there are many other parts that can be easily changed in design without departing from the technical concept of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a front view of an apparatus according to an embodiment of the present invention, and FIG. 2 is a side view of the same. (Explanation of symbols representing main parts of drawings), 1
...Bending machine, 3...Machine frame, 5...Bottom die, 9...Top die, 11...Ram, 29...
Presser cylinder, 33... L-shaped block (movable block), 35... detection device.

Claims (1)

[Claims] 1. A ram 11 supporting a top die 9 is provided on a bottom die 15 fixed to a machine frame 3 so as to be able to approach and separate from the ram 11,
A plurality of presser cylinders 29 are mounted on one side of the ram 11 or machine frame 3, and a plurality of movable blocks 33 are movably provided on the other side, and the movable blocks 33 are arranged in positions corresponding to and non-corresponding positions to each presser cylinder 29. A bending machine characterized by being provided with a position that can be freely positioned. 2. A movable block moving device is provided to selectively move each of the plurality of movable blocks 33 to a position corresponding to the presser cylinder 29 and a position not corresponding to the presser cylinder 29, and the movable blocks 33 are positioned to the corresponding position according to the bending width of the workpiece. The bending machine according to claim 1, characterized in that the bending machine is configured so that the number of movable blocks 33 can be selected. 3 Detection device 35 that detects the bending width of the workpiece
A bending machine according to claim 2, characterized in that the bending machine comprises: