JPH05337551A - Device for attaching lower die for press brake - Google Patents

Abstract

PURPOSE:To reduce the moving amount of a clamping device and to ensure clamping or unclamping by providing a space between the engaging face of a tightening member provided perpendicularly on a plural number of places on the lower face of a lower die, and the lower face of the lower die within a prescribed dimensional accuracy. CONSTITUTION:The tightening member 13 is constituted of a collar 15, washer 17, and clamping bolt 19, and the dimension of the width (A dimension) of the collar 15 is worked within the prescribed dimensional accuracy. Therefore, when the tightening member 13 is assembled, the dimension from the lower face of the lower die D to the engaging face 17a of th washer 17 (A dimension) is maintained within the prescribed dimensional accuracy, and consequently, the lower die D is fixed with a very minute amount of movement of an oscillating member that is provided on the clamping device. Thus, the whole device is made compact, the clamping or unclamping of the lower die D is ensured, and the workability is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting device for a lower die for a press brake, and more specifically, it facilitates narrowing of the lower die and shortens the movement amount of a clamp device for fixing the lower die. The present invention relates to a lower die mounting device for a press brake.

[0002]

2. Description of the Related Art Conventionally, a means for clamping a lower die for a press brake onto a die holder is, as shown in FIG. 6, a die holder 103 mounted on a lower table 101.
The tightening bolt 109 provided with the washer 107 is inserted into the hole 105 formed in the lower die D and is screwed into the screw hole 113 provided in the lower die D through the hole 111 for the bolt formed in the die holder 103. A means for fixing to the die holder 103 is general.

[0003]

By the way, in the above-mentioned conventional lower clamp means for press brake, in a machine of an average size, there are several to about 15 tightening bolts 109 per machine. To tighten or loosen the head of the attached bolt 109, tighten the spanner with a narrow hole 105
Put it inside, and 2 to 1 tightening bolt 109
Replace the wrench 3 times and tighten.

For this reason, the work is very troublesome for the operator, and it takes a lot of time, so that the workability cannot be improved.

In order to improve the above-mentioned problems, an object of the present invention is to make the tightening member vertically mounted on the lower mold have a good assembly dimensional accuracy, to shorten the moving amount of the clamp device and to make the entire device compact. In addition to the above, it is an object of the present invention to provide a lower die mounting device for a press brake, which secures clamping or unclamping of the lower die to improve workability.

[0006]

In order to achieve the above object, the present invention provides a lower die mounted on a die holder attached to a lower table of a press brake, and is vertically installed on a plurality of lower surfaces of the lower die. A mounting device of the lower die for the press brake is configured by providing a space between the locking surface of the fastening member and the lower surface of the lower die with a predetermined dimensional accuracy.

[0007]

By using the lower die mounting apparatus for a press brake of the present invention, the clamping member hung on the lower surface of the lower die for clamping or unclamping the lower die on the die holder is engaged. Since the distance between the stop surface and the lower surface of the lower mold is all within the specified dimensional accuracy, the amount of movement on the side of the clamping device can be small and reliable clamping or unclamping can be performed, improving workability. Be done.

[0008]

Embodiments of the present invention will be described in detail below with reference to the drawings. Since the press brake has a known structure, detailed illustration and description thereof will be omitted.

Referring to FIG. 2, the lower die D is detachably attached to the die holder 3 provided on the lower table 1, and the bending die Dv provided on the lower die D is bent upward. An upper mold P having a bent portion Pv that matches the mold Dv is inserted between a holder plate 5 and a clamp 7 mounted on the lower portion of an upper table (not shown), and fixed by the clamp 7. ing.

With the above construction, the upper table is lowered or the lower table 1 is raised so that the bending die Dv of the lower die D and the bending portion Pv of the upper die P mounted on the lower table 1. The plate material W is subjected to desired bending by cooperation.

Next, a detailed description will be given of a clamp device which is an embodiment incorporating a mounting device which is a main part of this embodiment.

Referring to FIGS. 4 and 5, the clamp device 9 is provided inside the die holder 3. In the die holder 3, a die holder body 3b is fixed on a seat plate 3a with a tightening bolt 11, and a lower die D is mounted on the upper surface of the die holder body 3b. Tightening members 13, which are attachment devices, are vertically provided at a plurality of lower surfaces of the lower mold D, and the fastening members 13 are fixed to the lower mold D by tightening bolts 19 via collars 15 and washers 17. . The length of the collar 15 mounted between the lower surface of the lower mold D and the upper surface of the washer 19 has a predetermined dimension. A stepped notch 21 is formed in the die holder body 3b, and the tightening member 13 is inserted into the notch 21.

The clamp device 9 is provided inside the die holder 3 and has an L-shaped rocking member 2 in which a locking portion 23 for contacting the upper surface of the washer 17 of the tightening member 13 is formed.
5 is pivotally attached to the hinge pin 27 and is rotatably provided. A plurality of sets of the swing members 25 are symmetrically provided on both sides of the tightening member 13, that is, in the longitudinal direction of the die holder 3.

A cylinder 31 for tightening and releasing which is operated by fluid pressure and which abuts on the upper and lower surfaces of the arm portion 29 of the rocking member 25, and the rocking member 2 by a bullet 33.
A pressing member 35 that biases 5 in the pressing direction is provided.

More specifically, as shown in FIG. 4, a cylinder 31 that abuts the upper surface of the arm portion 29 of the swing member 25 is formed in the die holder body 3b and has a piston 37. A pressure chamber 39 that presses the piston 37 is formed, and a flow path 41 that supplies, for example, hydraulic pressure as a pressure fluid to the pressure chamber 39 is provided. Reference numeral 43 is a seal member.

With the above structure, when pressure oil is supplied to the flow path 41, the pressure oil flows into the pressure chamber 39 and pushes out the piston 37. The piston 37 pushes the arm portion 29 of the swinging member 25, and when the swinging member 25 rotates about the hinge pin 27 as a fulcrum, the locking portion 23 provided on the swinging member 25 and the washer 17 of the fastening member 13 are provided. Away from the upper surface of.

The pressing member 35 is provided inside the die holder 3 and is provided so as to face the piston 37 of the cylinder 31 and the arm portion 29 of the swinging member 25. That is, the pressing pin 45 that abuts the lower surface of the arm 29 and the ammunition 33 that urges the pressing pin 45 upward.
For example, it is composed of a disc spring and the like, and an adjusting member 47 for setting the elastic force of the ammunition machine 33. The adjusting member 47 is screwed into a screw hole 49 provided in the seat plate 3a of the die holder 3 and has a turning hole 51 with which a screwing tool is engaged. The rotation of the adjusting member 47 is stopped by the screw 55 provided. The adjusting member 47 is provided with a recess 47a that determines the lower limit of the pressing pin 45.

With the above structure, the pressing pin 45 set to a desired pushing force is in contact with the back surface of the arm portion 29 of the swinging member 25, and when the hydraulic pressure supplied to the cylinder 31 is discharged. The swinging member 25 is rotated by the elastic force of the bullet 33. The lower die D is fixed onto the die holder 3 by pressing the washer 17 of the tightening member 13 with the locking portion 23 provided on the swinging member 25.

Since the hydraulic pressure is supplied to the cylinder 31 as a pressure fluid, the piping members 57a, 5 communicating with the flow path 41 are connected.
7b and 57c are provided on the back surface side of the die boulder 3 via a pipe material. The flow path 59 communicates with the pipe member 57c and communicates with the hydraulic pressure generation source 63 via the coupler 61 (see FIG. 5).

With the configuration as described above, the operation is that the hydraulic pressure generation source 63 is operated to allow the pressure oil to flow.
It is supplied from the flow path 41 into the pressure chamber 39 of each cylinder 31 through a, 57b and 57c, and the piston 37 is pushed out. When the piston 37 is pushed downward, the swinging member 25 is rotated against the elastic force of the bullet 33, and the pressing pin 45 is restricted from descending by the recess 47a provided in the adjusting member 47. The locking portion 23 of the swinging member 25 is positioned so as not to contact the washer 17 of the tightening member 13 provided on the lower mold D. In this state, the fastening member 13 integrally locked to the lower die D is inserted into the notch 21 of the die holder 3, and the lower die D is placed on the die holder 3.

When the lower die D is inserted and placed, the cylinder 31
The pressure oil supplied to is discharged. When the pressure oil is discharged, the pressing pin 45, which is the pressing member 35 provided below the arm portion 29 of the swinging member 25, is pushed up by the elastic force of the ammunition machine 33 to lift the swinging member 25. The piston 37 is pushed up and retracted while being rotated. When the swing member 25 is rotated, the locking portion 23 provided on the swing member 25 presses the upper surface of the washer 17 of the tightening member 13 to move the lower mold D to the die holder 3
Can be firmly fixed to the top. The die holder 3
The lower die D can be removed by reversing the above operation.

Next, the mounting device, which is the main part of this embodiment, will be described in more detail.

With reference to FIGS. 1 and 2, a fastening member 13 as a mounting device is vertically provided at a plurality of places on the lower mold D. The fastening member 13 is fastened to a collar 15, a washer 17 and a fastening member. It is composed of an attached bolt 19. The width dimension of the collar 15, that is, the A dimension shown in the drawing of FIG. 1, is processed within the accuracy of a predetermined dimension.

Therefore, when the tightening member 13 is assembled,
Since the dimension (A dimension) from the lower surface of the lower die D to the locking surface 17a of the washer 17 is maintained within the accuracy of the predetermined dimension, the movement amount of the swing member 25 provided in the clamp device 9 described above is extremely small. The lower die D can be fixed with a slight movement.

Thus, the entire apparatus can be made compact, and clamping or unclamping of the lower die D can be ensured to improve workability.

Further, referring to FIG. 3, this embodiment is of a type in which the collar 15 is not used in the first embodiment described above. That is, the tightening member 13, which is a mounting device vertically installed on the lower mold D, includes the bullet 65, the washer 17, and the tightening bolt 6.
7 and. A step portion 67a is formed on the tightening bolt 67, and when the step portion 67a abuts on the lower surface of the lower die D, the locking surface 17a of the washer 17 incorporated in the tightening bolt 67 and the lower surface of the lower die D are assembled. In order to maintain the dimension between (and A in the diagram of FIG. 3) within the accuracy of the predetermined dimension,
The position of the step 67a of the tightening bolt 67 is machined.
The ammunition 65 is an elastic member such as a spring, a disc spring, and urethane rubber, and is used to fix the washer 17. Thus, the effect can be the same as that of the first embodiment.

The present invention is not limited to the above-mentioned embodiments, but can be implemented in other modes by making appropriate changes.

[0028]

As can be understood from the above description of the embodiments, according to the present invention, since the structure is as described in the claims, it is incorporated into the lower surface of the lower mold and the tightening bolt. Since the dimension between the washer and the locking surface is maintained at a predetermined dimensional accuracy, the lower die can be easily clamped or unclamped on the die holder.

Thus, the amount of movement of the clamp device can be shortened to reduce the size of the entire device, and the lower mold clamp or unclamp can be ensured to improve workability.

[Brief description of drawings]

FIG. 1 is a front view of a lower mold attaching device showing a main part of the present invention.

FIG. 2 is an enlarged side view of FIG.

FIG. 3 is a front view of a lower mold attaching apparatus which is another embodiment showing the main part of the present invention.

FIG. 4 is a cross-sectional view of a clamp device incorporated in a die holder according to an embodiment of the present invention.

FIG. 5 is a plan view of FIG.

FIG. 6 is a cross-sectional view of a clamp device showing a conventional example.

[Explanation of symbols]

 1 Lower table 3 Die holder 13 Tightening member 17a Locking surface D Lower mold

Claims (1)

[Claims] 1. A lower die attached to a die holder attached to a lower table in a press brake, and locking surfaces of fastening members vertically provided at a plurality of lower surfaces of the lower die, and a lower surface of the lower die. The lower die mounting device for a press brake, characterized in that the space between the two is provided within a predetermined dimensional accuracy.