JP3167795B2 - Die holder for press brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold holder for holding an upper mold and a lower mold in a press brake, and more particularly, to easily align upper and lower molds and easily adjust at the time of air bend. It relates to a mold holder.

[0002]

2. Description of the Related Art In a press brake, an upper table supporting an upper die and a lower table supporting a lower die are vertically opposed to each other, and one of the upper and lower tables can be moved up and down. That is, the upper and lower dies are individually mounted on the upper and lower tables, respectively. When adjusting the alignment of the upper and lower dies, the upper and lower dies are brought closer to each other to adjust the alignment. The upper and lower dies are fixed to the upper and lower tables in a state where the upper and lower dies are combined as described above.

[0003] When air bend is performed, the engagement of the upper and lower dies is adjusted by controlling the vertical position of the table to be raised and lowered.

[0004]

As described above, conventionally, the upper and lower molds are individually mounted on the upper and lower tables, respectively, so that the alignment of the upper and lower molds is troublesome.
In particular, when the upper and lower molds are exchanged, there is a problem that it takes time to set up. Further, there is a problem that adjustment of engagement between the upper and lower dies during air bend is troublesome.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a base which can be mounted on a lower table of the press brake in the left-right direction in place of a normal lower die of the press brake, An upper die holder is provided, which is supported on the right and left sides of the base so as to be movable up and down on both right and left sides along a guide post, and a lower die is detachably mounted on the base and provided on the upper die holder. The upper mold is detachably mounted.

Further, a stopper is provided at an appropriate position on the base so that the lowermost position of the upper die holder can be adjusted.

[0007]

With the above configuration, the upper and lower dies can be mounted on the upper die holder and the base respectively, with the base removed from the lower table of the press brake,
The upper and lower dies can be easily attached and detached and exchanged and the centering can be easily performed by external setup. In addition, by adjusting the position of the stopper, the lowermost position of the upper mold holder can be adjusted, and the state of engagement between the upper and lower molds during air bend can be easily adjusted.

[0008]

Referring to FIGS. 1 and 2, a mold holder 1 according to the present embodiment can be mounted on a lower table 3 in place of a normal lower mold or lower mold holder in a press brake (not shown). A base 5 is provided. The base 5 is detachably mounted on the lower table 3 by being sandwiched by a plurality of holder plates 9 attached to both front and rear surfaces of the lower table 3 by a plurality of fixing bolts 7.

The base 5 is provided to be long in the left-right direction, and guides are provided at both ends thereof (only one end is shown in FIG. 1 and the other end is omitted because it is symmetrical in the left-right direction). A post 11 is provided upright. An elevating cylinder 13 is fitted to this guide post 11 so as to be movable up and down, and both ends of an upper die holder 15 which is long in the left-right direction are integrally attached to the upper part of the elevating cylinder 13.

In order to urge the upper die holder 15 upward, a guide cylinder 17 is provided at both ends of the base 5 adjacent to the guide post 11. Guide bars 19 mounted on both sides of the upper die holder 15 are fitted to be vertically movable. The lifter spring 2 provided around the guide bar 19 is provided.
1 is elastically mounted between the guide cylinder 17 and the upper die holder 15.

In order to mount the lower die 23 on the base 5, a mounting base 27 forming a mounting groove 25 is fixed on the base 5. Screw holes 23H are provided at a plurality of locations on the lower surface of the lower die 23. The screw holes 23H hold a tightening ring 29 for tightening the protrusion 27P of the mounting base 27 forming the mounting groove 25. The fastening bolt 31 is screwed.

With the above structure, the lower mold 2 is
3 can be easily replaced.

In order to mount the upper die 33 cooperating with the lower die 23 to the upper die holder 15, a plurality of upper die clamps 37 are mounted on the upper die holder 15 via a plurality of tightening bolts 35. is there. An abutment 39 serving as an abutment for the upper mold clamp 37 is attached. Note that the abutment 39 is not always necessary, and can be omitted, for example, in a case where the upper mold clamp 37 has a protruding portion.

With the above structure, before mounting the mold holder 1 on the lower table 3 of the press brake, the necessary lower mold 23 is mounted on the base 5 of the mold holder 1 and the upper mold holder is mounted. The upper die 33 is attached to the 15. Then, the upper die holder 15 is lowered against the lifter spring 21 to engage the upper and lower dies 33, 23, and the upper and lower dies 33, 23 are aligned and fixed.

That is, the mounting and dismounting of the upper and lower dies 33 and 23 with respect to the dies holder 1 and the alignment of the dies 33 and 23 can be performed by an external setup before mounting the press brake. Therefore, a plurality of mold holders 1 are prepared, and separate molds 33 and 23 are attached to each mold holder 1 in advance to prepare upper and lower molds 3.
When processing is performed by exchanging 3, 23, it is possible to respond quickly.

As described above, after the upper and lower dies 33, 23 are mounted on the die holder 1, the die holder 1 is mounted on the lower table 3, and the upper table or the die mounted on the upper table in the press brake. By lowering the upper mold holder 15 relatively against the lifter spring 21 with the holder PH, the upper mold 33 and the lower mold 23 can be engaged, and the upper mold 33 and the lower mold 33 are positioned between the upper and lower molds 33 and 23. The bent plate material can be bent.

When the plate material is bent as described above, the mold holder 1 is not adversely affected by the distortion, even if the press brake frame is distorted due to the drag. The engagement between the upper and lower dies 33, 23 can always be performed accurately.

As described above, when the upper and lower dies 33 and 23 are engaged with each other to bend the plate material, for example, at the time of air bending, the upper and lower dies 33 and 23 are placed in the bottom-polished state before the upper die holder. 15 relative descents need to be stopped.

Therefore, in the present embodiment, a shim 41 as a stopper is detachably provided on the guide post 11. The shim 41 is formed in a U-shape in which a part of a disk is cut out, and is provided so as to be able to be mounted on a pedestal portion 11 </ b> S provided below the guide post 11. The shims 41 are prepared in various thicknesses and used in appropriate combinations.

With the above structure, when the upper die holder 15 is relatively lowered, the elevating cylinder 13 integrated with the upper die holder 15 is moved.
The shim 41 is sandwiched between the lower end of the upper and the pedestal portion 11S of the guide post 11, and the lowering of the upper die holder 15 is restricted.

That is, by replacing the shim 41, the lowermost position of the upper die holder 15 can be adjusted, and air bend can be easily performed.

The configuration for adjusting the lowermost position of the upper die holder 15 is not limited to the above configuration, but can be implemented in other modes by making various changes. For example, a screw portion is formed in the lower portion of the guide post 11 or the pedestal portion 11S, and a nut member is screwed to the screw portion so that the nut member can be adjusted up and down. A variety of configurations can be employed, such as a configuration in which a bolt is erected from the base 5 so as to be adjustable in height and the bolt controls the lowering of the upper die holder 15.

Further, the plate material after the bending is transferred to upper and lower molds 3.
When the bending process is performed to take out the product in the longitudinal direction (left-right direction) of the third and / or the third product 23, in other words, when the product after the bending process cannot be taken out to the front side (the left side in FIG. 2), FIG. As shown by the imaginary line in FIG. 2, a protrusion 5P protruding backward (to the right in FIG. 2) is provided on both sides of the base 5, and a protrusion 15P in the same direction is provided on the upper die holder 15, It is desirable that the guide posts 11, the lifter springs, and the like be provided at the portions of the two projecting portions 5P, 15P to secure a space in the left-right direction of the upper and lower dies 33, 23.

[0024]

As will be understood from the above description of the embodiment, according to the present invention, the upper and lower dies 33 and 23 are attached to and detached from the die holder 1 outside the press brake, and are replaced. In addition, by performing the alignment of the dies 33 and 23 in advance, the dies can be quickly replaced.

Further, when bending the plate material, the upper and lower dies 33 and 23 always engage accurately without being affected by the above-mentioned distortion, even if the press brake frame is distorted. And accurate machining can be performed.

Further, since the lowermost position of the upper die holder 15 can be adjusted, air bend can be performed accurately.

[Brief description of the drawings]

FIG. 1 is a front view of a mold holder according to an embodiment of the present invention;
Some parts have been omitted.

FIG. 2 is a right side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Die holder 3 Lower table 5 Base 11 Guide post 15 Upper die holder 23 Lower die 33 Upper die

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21D 5/02

Claims (2)

(57) [Claims] 1. A base which can be mounted on a lower table of the press brake in the left-right direction in place of a normal lower mold of the press brake, and is provided on both left and right sides along guide posts erected on the left and right sides of the base. A press which is provided with an upper die holder movably supported up and down, a lower die is detachably mounted on the base, and an upper die is detachably mounted on the upper die holder. Mold holder for brake. 2. A die holder for a press brake according to claim 1, wherein a stopper capable of adjusting a lowermost position of said upper die holder is provided at an appropriate position on said base.