JPH10296338A - Clamp device of press brake lower die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more strongly clamp a lower die with a die holder and to prevent the lower die from moving during working in a clamp device of the lower die of a press brake. SOLUTION: In a lower die 5 attached to a die holder body 4 installed on a lower table in a press brake, tightening members 12 are attached vertically on plural places of lower face of the lower die 5, a swinging member 16 with an engaging part 15 to press or release these tightening members 12 and a swinging member 22 to swing the swinging member 16 are installed freely rotatably inside the die holder body 4, a screw 32 is installed on one end of a hole 29 piercing in the longitudinal direction of the die holder body 4, a rotating shaft 30 to screw on this screw 32 is installed, and a stopper member 34 is installed at a prescribed position of this rotating shaft 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device for a lower die for a press brake.

[0002]

2. Description of the Related Art As is well known, a press brake for bending a work has an upper mold mounted on an upper table of the press brake and a lower mold mounted on a lower table of the press brake. The workpiece is machined by engaging the tip of the upper mold with the groove of the lower mold.

The lower die used in the press brake is mounted on a lower table of the press brake via a die holder. The lower die is mounted on the die holder by a lower die. A bolt provided with a washer disposed on the lower surface of the mold is fitted into the notch of the die holder and further tightened.However, when a long lower mold is attached to the die holder. Had to tighten many bolts, and the workability was very bad.

In order to solve the above-mentioned problem, that is, to improve the workability when the lower mold is mounted on the die holder, a lower mold for press brake as disclosed in Japanese Patent Application No. 4-145646. Has been proposed and actually used. This is to form a clamp means on the die holder, which can mount the lower mold by a simple operation, and to operate a large number of clamp means simultaneously. This improves the workability.

The clamp device for the lower mold for press brake has a swing member for locking a fastening member provided on the lower surface of the lower mold, and a screw portion for swinging the swing member. Clamping means comprising a rotating shaft and a stopper member provided on the rotating shaft is provided in the die holder, and the clamp means is formed by the number of fastening members provided on the lower surface of the lower mold, The configuration in which the respective clamping means are interlocked facilitates the mounting and fixing of the lower mold to the die holder, and improves the workability.

[0006]

According to the above prior art, the lower die can be easily mounted on the die holder, and the workability is improved, but the clamping force is not sufficient. In some cases it was enough.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a press brake having a clamping force that can withstand any operation. An object of the present invention is to provide a mold clamping device.

[0008]

In order to achieve the above object,
The present invention has the following technical means. That is, using the reference numerals used in the accompanying drawings corresponding to the embodiments, the lower mold 5 corresponding to the upper mold 2 mounted on the upper table 1 of the press brake is mounted on the lower table 3. A lower mold for press brake, comprising a plurality of die holder bodies 4 arranged in the longitudinal direction and formed with a clamp means for locking the fastening member 12 disposed on the lower surface 33 of the lower mold 5. The clamp device of the lower die for press brake, wherein the principle of "double leverage" is utilized for the clamp means.

[0009]

According to the present invention, in order to fix the lower mold to the die holder by the above-mentioned technical means, first, when the rotation shaft is turned in the screwing direction, the stopper member moves in the longitudinal direction, so that the two swing members are moved. It turns, and the locking portion provided on one of the rocking members separates the fastening member suspended from the lower die, and in this state, the lower die is inserted onto the die holder.

When the lower mold is inserted, when the rotating shaft is rotated to the opposite side, the two rocking members are rotated by the movement of the stopper member in the longitudinal direction. The locking portion provided on one of the rocking members of the rocking member presses the tightening member vertically provided on the lower surface of the lower mold,
The lower mold is firmly fixed on the die holder. When removing the lower die from the die holder, the lower die can be easily removed by performing the above operation in reverse.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As shown in FIG. 1, a press brake for bending a sheet metal includes an upper die 2 mounted on an upper table 1 of the press brake, and a die holder body 4 mounted on a lower table 3 of the press brake. An upper mold 2 is detachably provided on the upper mold 2. The upper mold 2 is fixed by a clamp 7 which is fastened by a bolt 6, and the lower mold 5 is a lower table. 3 is fixed to a die holder main body 4 fixed by bolts 8 and clamps 9.

Next, a clamp device for a lower mold for press brake according to the present invention will be described in detail. Referring to FIG. 2, the clamp device is provided inside the die holder main body 4. The die holder main body 4 is fixed on a seat plate 10 by tightening bolts 11, and a lower die 5 is mounted on the upper surface of the die holder main body 4. Are provided vertically, and a stepped notch 13 is formed in the die holder body 4,
The fastening member 12 is inserted into the notch 13.
Reference numeral 14 denotes a knock pin for positioning the die holder main body 4 and the seat plate 10.

The clamping device is provided inside the die holder main body 4, and includes an L-shaped swinging member 16 having a locking portion 15 abutting on an upper surface of a washer 35 of the tightening member 12. And is provided rotatably. L-shaped back surface 18 of the swing member 16
A concave portion 19 is formed in the concave portion 19, and a coil spring, for example, is inserted into the concave portion 19 as an elastic machine 20 built in the die holder main body 4 side, and constantly urges the swinging member 16 counterclockwise in FIG. ing. That is, the locking portion 15 provided on the swinging member 16 is urged to be separated from the upper surface of the washer 35 of the fastening member 12. Further, the protrusion 21 of the swing member 16 is in contact with the back surface 23 of the swing member 22.

The swing member 22 is pivotally attached to a hinge pin 24 and is provided rotatably.
6 is in contact with the surface 27. Further, a through hole 28 is formed, and a rotating shaft 30 mounted in a hole 29 penetrating in the longitudinal direction of the die holder main body 4 is inserted into the through hole 28 with a predetermined gap. The tip side of this rotating shaft 30;
A screw portion 31 is formed on the left side (in FIG. 2), and the screw portion 31 is screwed to a screw 32 threaded on the die holder main body 4. Further, the swing member 2 is
A stopper member 34 for swinging the second member 2 is attached.

When the lower die 5 is mounted on the clamp device for the lower die for press brake, the tightening member 12 disposed on the lower surface 33 of the lower die 5 is provided with a notch 13 formed in the die holder body 4. Then, by rotating the rotation shaft 30 and pulling the stopper member 34 in the direction of the swing member 22, the swing members 22 and 16 rotate, and are fastened by the locking portions 15 of the swing member 16. The attachment of the lower mold 5 is completed by locking the attaching member 12, and the attachment of the lower mold is made stronger by a simple operation of simply rotating the rotating shaft 30, and a large number of clamping means are provided. Since the lower mold 5 is mounted at the same time, the lower mold 5 can be mounted very easily.
Can be easily removed from the lower mold clamping device for press brake.

The swing members 16 and 22 constituting the above-described clamp device function as a "double lever", so that the lower mold 5 can be more strongly fixed to the upper surface of the die holder main body 4. is there.

[0017]

As will be understood from the above description of the embodiments, according to the present invention, since the structure is as described in the claims, two rotations are performed by rotating the rotation shaft. The lower die can be more strongly fixed on the die holder main body by utilizing the principle of "double lever" by moving the swinging member.

[Brief description of the drawings]

FIG. 1 is a side view of FIG. (A arrow view)

FIG. 2 is a sectional view showing a main part of the present invention and illustrating a clamp device incorporated in a die holder main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper table 2 Upper mold 3 Lower table 4 Die holder main body 5 Lower mold 12 Tightening member 15 Locking part 16 Swing member 17 Hinge pin 22 Swing member 24 Hinge pin 30 Rotating shaft 34 Stopper member

Claims (1)

[Claims] 1. A lower die which is mounted on a die holder mounted on a lower table of a press brake, and a tightening member is vertically provided at a plurality of lower surfaces of the lower die to press or release the tightening member. In a lower mold clamping apparatus for a brake having a clamping means having a stop portion, a double lever is provided in a die holder as the clamping means.
A lower mold clamping device for press brakes, characterized by using a.