JPS6016421Y2 - press brake - Google Patents

Description

[Detailed description of the invention] This invention relates to a new press brake, and more specifically, for example, in a hydraulic press, the movable ram provided opposite to a fixed table always maintains an equilibrium state and has high precision. The present invention relates to a press brake that can be used for processing.

Generally, in this type of machine tool, when machining is performed by bringing a long ram close to a fixed table, the long ram must always maintain equilibrium with the fixed table as it approaches. You need to move it while doing so.

In addition, in the case of press working, applying an equal pressing force in the longitudinal direction of a long ram is difficult due to the unevenness of the materials. Even if there were, the plate thickness would be different in the longitudinal direction, making it impossible.

Furthermore, due to the unevenness of the pressing force, the long ram tilts upward to the left or upward to the right, making it impossible to maintain equilibrium with the fixed table, resulting in variations in the product.

Particularly in the case of bending, the left and right bending angles varied, causing problems with product combinations and product accuracy.

In order to solve this problem, various measures have been taken in the past.

For example, measures have been taken to connect torsion bars on the left and right sides of the movable ram, or to provide a vertical guide section in the center of the movable ram, but these methods have made the machine itself larger, making it difficult to solve the above problems. It was not something that could be resolved.

This invention effectively solves these conventional problems, and its purpose is to connect connecting rods movable in the left-right direction via link members to the lower sides of the movable ram to form parallel links. The present invention provides a press brake that constantly balances the movable ram with respect to the fixed table and improves the accuracy of press working.

Hereinafter, a preferred embodiment of this invention will be described based on the accompanying drawings.

FIG. 1 and FIG. 2 show a schematic front view and a side view of a press brake 1 implementing this invention. This is a so-called hydraulic press in which a movable ram 7 moves up and down.

On both sides of the machine frame 3, two C-shaped frames 9a*9b are integrally attached with a fixed frame 11, located on the back side of the movable bottom 7, and on the bottom. The bottom plate 13 is integrally fixed.

Furthermore, a front fixed frame 1 is provided on the front side of the movable ram 7.
5 is integrally fixed to the bottom plate 13.

A rapid rise cylinder 17 and pressure cylinders 19a and 19b for raising and lowering the movable ram 7 are provided approximately in the center between the fixed frame 11 and the front fixed frame 15.

Link members 21a, 2 are provided at the bottom of both sides of the movable ram 7.
Shafts 23a and 23b are provided to rotatably support one end of link members 1b, and the other ends of link members 21a and 21b are connected to fan-shaped rotating plates 27a and 25b via shafts 25a and 25b.
It is rotatably connected to 27b.

The fan-shaped rotating plates 27a and 27b are connected to a shaft 29a provided between the fixed frame 11 and the front fixed frame 15.
, 29b, and are rotatably supported.

Also, the shaft 29a. At both ends of 29b are shafts 29a,
The small shaft portions 35a, 3 are located eccentrically from the axis of 29b.
5b is formed, and these small shaft portions 35a, 35b allow the shafts 29a, 29b to be connected to the fixed frame 11.
and the front fixed frame 15.

By rotating the small shaft portions 35 a, 35 b, the rotating plate is rotated according to the eccentricity α between the axes of the shafts 29 a, 29 b and the axes of the small shaft portions 35 a, 35 b. The vertical positions of 27a and 27b can be adjusted.

Further, the rotating plates 27a and 27b have a shaft 31a.

A connecting rod 33 is swingably provided via the connecting rod 31b, and the other end of the connecting rod 33 is connected to the rotating plate 27a on the opposite side,
27b.

Note that the link members 21a, 21b and the connecting rod 33 are
Each piece is made up of two layers stacked one on top of the other in the front and back, and has a structure that is sufficiently strong against tension and compression.

Further, a shaft 4 is provided at the center position in the longitudinal direction of the movable ram 7.
3 is fixed, and this shaft 43 is connected to the fixed frame 1.
1, and a bearing 37 is rotatably provided at the tip of the shaft 43.

The bearing 37 is connected to the fixed frame 11.
The bearing slides along the side of the guide plate 39.39 and moves up and down while guiding the movable ram 7.

Next, the operation of this embodiment constructed as described above will be explained.

First, when adjusting the movable ram 7 parallel to the fixed table 5, the small shaft portion 35a is provided at an eccentric position of the shaft 29at29b.

35b to adjust the vertical positions of the rotating plates 27a and 27b according to the eccentricity α.

By vertically moving the rotating plates 27a and 27b,
One side of the movable ram 7 also moves up and down via the link members 21a and 21b.

Therefore, the movable ram 7 can be easily adjusted in parallel.

Incidentally, if necessary in the feeding bending process or the like, it is also possible to appropriately tilt the movable ram 7 with respect to the fixed table 5 by rotating the small shaft portions 35 a and 35 b in the same manner as described above.

Next, the rapid rise cylinder 17 and the pressure cylinder 19a,
19b, when the movable ram 7 is raised and lowered, the link members 21a and 21b connected to the movable ram 7 via the shafts 23a and 23b are also raised and lowered.

As the link members 21a and 21b move up and down, the rotating plate 27a is moved through the shafts 25a and 25b.
, 27b rotate around shafts 29a, 29b.

In this case, the rotating plates 27a and 27b rotate in the same direction.

And the shaft 31a. Rotating plate 27a via 31b
, 27b is connected to the rotating plate 27a.
, 27b, one end receives compression and the other end receives tension and moves left and right.

Note that the bearing 3 moves up and down integrally with the movable ram 7.
7 fits into and slides on the guide plates 39a, 39b, so even if the link members 21a, 21b are tilted, the movement of the movable ram 7 in the left and right direction is restricted, and the movable ram 7 can only move in the up and down direction. Moving.

The movable ram 7 moves up and down while maintaining parallel to the fixed table 5 with the above-mentioned movements.Next, a single load is applied to the movable ram 7, for example, at point P□. Let me explain the case.

In this case, due to the single loads at 11 points and the pressurizing cylinder 19b, a force is exerted on the movable ram 5 to rotate clockwise around the shaft 43, pushing the shaft 23b upward and moving the movable ram 5 through the link member 21b. The shaft 25b also tries to be pushed upward.

Then, by pushing up the shaft 25b,
The rotating plate 27b rotates clockwise about the shaft 29b, and attempts to move the connecting rod 33 to the left via the shaft 31b.

Further, the connecting rod 33 causes the rotating plate 27a to rotate clockwise about the shaft 29a via the shaft 31a.

When the rotating plate 27a rotates, the shaft 25a is pushed upward, and the shaft 23a is also pushed upward via the link member 21a.

Therefore, the lower right side of the movable ram 7 is pushed up, and the parallelism of the movable ram 7 is maintained.

In this way, when a single load is applied to 11 points on the movable ram 7, the parallelism of the movable ram 7 is maintained by the above operation, but when a single load is applied to the 12 points on the left side of the movable ram 7, Even when the force is applied, the same operation as described above works, and the movable ram 7 is maintained in parallel.

Further, even when the movable ram 7 is tilted with respect to the fixed table 5 by adjusting the rotation of the small shaft portions 35 a and 35 b, the above-mentioned operation works and the movable ram 7 is not affected by a single load. The movable bottom 7 moves up and down while maintaining the tilted state.

As can be understood from the above description of the embodiments, the gist of the present invention is as stated in the claims of the utility model registration, and therefore the following effects can be achieved.

■ Even if the material, thickness, etc. of the workpiece are non-uniform, highly accurate buttos processing can be performed.

■ In addition, all work to maintain the parallelism of the movable ram 7 is performed automatically, and pressing can be performed at any location in the longitudinal direction of the movable ram 7 without reducing machining accuracy, so work efficiency can be significantly improved. .

(2) Further, even if the movable ram 7 is tilted with respect to the fixed table 5 and the feeding bending process is performed, it is possible to perform press working with high processing accuracy.

Note that this invention is not limited to the above-mentioned embodiments, and can be implemented in other embodiments.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a press brake implementing this invention, and FIG. 2 is a side view of FIG. 1. Explanation of main symbols displayed in the drawings, 5...
Fixed table, 7...Movable ram, 21a, 21
b...Link member, 33...Connection rod.

Claims (1)

[Scope of utility model registration request] A movable ram 7 that can be raised and lowered is provided with respect to a fixed table 5 that is integrally fixed to a fixed frame, and both rotating plates 27a are supported near both left and right sides of the fixed frame so as to be rotatable in the left and right direction. , 27b, both ends of a connecting rod 33 extending in the left-right direction are pivotally connected, and the vicinity of both left and right sides of the movable ram 7 and both the rotating plates 27a, 27b are connected via link members 21a, 21b. A press brake characterized by being connected to each other.