JPS6334740Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a ram and bed deflection correction device in a press brake.

[Conventional technology]

When performing V-bending while applying compression in the thickness direction to the bending part of a long plate, the bending line of the plate may be distorted due to the effects of compressive stress and tensile stress caused by bending, and the deflection of the ram and bed. Warpage may occur along the curve, or the bending angle may be uneven. For this reason, in Japanese Patent Publication No. 49-27025, divided wedges are buried in the lower mold assembly, and by advancing each wedge, the lower mold is made mid-height to prevent deflection. Furthermore, JP-A-52-120951 discloses that a cushioning device with a large number of small cylinders is incorporated under a pad that supports the bent portion of a long plate material, and each cushioning device is adjusted to make the lower mold medium-height. has been done.

[Problem that the invention attempts to solve]

The above-mentioned conventional technology can correct the deflection due to V-bending.
In the case of the No. 1 publication, the operation is complicated because each wedge must be moved by adjusting more than ten setscrews. In addition, for those equipped with a cushion device under the pad, each cushion device can be operated at the same time, but a separate hydraulic circuit must be added to prevent oil leaks, which is not effective as a whole. There was a problem. Therefore, the purpose of the present invention is to eliminate the method of providing set screws for each divided wedge, and to easily correct the deflection by gradually decreasing the degree of advance of the wedge from the center toward the left and right with a single operation. It is said that

[Means for solving problems]

In order to achieve the above object, the present invention provides a beam whose both ends are fixed with pins on the upper part of the lower mold holder arranged along the longitudinal direction of the bed, and a number of divided wedges are arranged on the upper surface of the beam. For example, beam pressing means are provided at the center of the front edge of the lower die holder or at several places on the left and right of the center to bend the beam in a horizontal plane so as to gradually reduce the degree of advancement from the center to the left and right wedges. This is a correction device.

The beam pressing means is a set screw screwed toward the beam from the front edge of the lower mold holder, and by pushing the set screw, the beam with both ends pinned is curved in a horizontal plane. According to this curvature, the wedge in the central portion is advanced to the maximum via the rising portion and the screw, and the degree of advancement of the wedge is gradually decreased from this point to the left and right. The number of set screws is not limited to one screwed into the front end of the center of the beam, but a pair or more may be provided on the left and right sides with an interval in the center. In that case, if a sprocket is fixed to the end of the set screw and a chain, operating shaft, etc. are provided to rotate each set screw in conjunction with each other, the correction operation can be performed more easily.

〔Example〕

FIG. 1 shows a sectional view of the correction device of the present invention, in which 1 is the bed, 2 is the ram, 3 is the lower die assembly, and 4
is the upper type.

The lower die assembly 3 includes a pedestal 5 placed in the longitudinal direction of the bed 1, a beam 6 on the pedestal 5, a number of divided wedges 7, a lower die holder 8, and several lower dies. It consists of 9a, 9b, and 9c. beam 6
As shown in FIG. 3, holes 10 are formed at both ends, and pins 11 are passed through the holes 10, and the center portion is fixed to the pedestal so that it is curved in a horizontal plane.

FIG. 2 is an exploded perspective view of the lower mold assembly 3,
The pedestal 5 has rising sides 12 and 13 at the front and rear, and has a recess 15 with a substantially rectangular cross section on the front rising side while leaving a flat step 14 on the rear rising side from the center.
is formed. Into this recess 15 is fitted a beam 6 which has a main body portion having the same thickness as the recess 15 and a width smaller than that of the recess, and has a number of rising portions 16 at intervals at the front portion. The rising portion 16 is formed at a position corresponding to the center of the front surface of each divided wedge. In addition, holes 17 are provided at one longitudinal center of the front rising side 12 of the pedestal 5, or on the left and right sides at intervals at the center, and the setscrews 20 are inserted therethrough. The set screw 20 has a bulge 21 in the center to prevent it from coming out, one end is screwed into the female screw hole 19 provided at the front end of the beam 6, and the tip protrudes from the bulge 21 to the front of the cradle.
The sprocket 28 is secured using the pin 22.
When only one set screw 20 is used as a pressing means, the set screw is rotated by using the chamfer 20a formed at the outermost end of the set screw, but normally, as shown in FIGS. Using a set screw 20, attach sprockets 28 to 31 and chains 32 to 33.
Then, the operating means consisting of the operating shaft and the handles 34, 35 is rotated to impart synchronous rotation to each set screw.

A wedge 7 divided into, for example, 100 to 200 mm is placed so as to straddle the upper surface of the beam 6 and the stepped portion 14 of the pedestal with its slope facing upward. A T-groove 7b is provided on the front surface of each wedge, and the rising portion 1 of the beam 6 is
The adjuster screw 24 is screwed into the female screw hole 23 drilled in the screw hole 6, and its head 25 is engaged with the T-slot 7b of each wedge. The longitudinal position of each wedge can be finely adjusted by adjusting the adjusting screw 24. Further, several (three in the figure) lower molds 9a, 9b, 9c are arranged in the central recess of the lower mold holder 8, and are tightened with bolts 2b on the front edge 18. It forms a slope 8a that comes into close contact with the upper surface of the wedge 7, and a groove 27 that engages with the rear rising side 13 of the pedestal is provided at the sloped end.

The lower mold assembly 3 moves in the front and back direction by a sliding mechanism (not shown), and the lower molds 9a, 9b, 9c
Among them, the selected one is set at a position opposite to the upper mold 4. After setting, the work plate material 50 can be bent in a V direction by lowering the ram 2.

Figure 3 shows the main body thickness: 15 mm, width: 60 mm, length: 3
Fig. 4 shows the pattern of curvature of the beam when the set screw is pressed from two places on the left and right, 300 mm apart from the center using a beam of 30 mm, and Fig. 4 is a deflection diagram using the stroke of the set screw as a parameter. Since the beam 6 is supported by pins at both ends, the central portion is displaced to the maximum by the pressure of the set screw, and the beam is curved in a horizontal plane in a manner that gradually decreases toward the left and right ends. As the beam 6 curves, the degree of advancement of each wedge 7 sandwiched between the upper surface of the beam and the lower mold holder is determined via the adjusting screw 24, thereby making the lower mold medium-height. By advancing each wedge 7, the center of the lower die is made convex and slightly bent into a mountain shape, and distortions caused by the deflection of the ram and bed during bending can be corrected in advance.

Fig. 5 shows a modified example in which a set screw 40 is installed through the rear of the lower die holder 5, and the sprocket is placed at the rear of the press brake, while the set screw is adjusted from the front side. This is what I did.

That is, the beam 6 is fitted into the recess 15 of the pedestal 5, a rising portion 16 is provided at the front end of the beam, and the adjusting screw 2 is inserted from this point toward the front end of the wedge 7.
4 is screwed together in the same manner as shown in FIG. Fix 30. A recess 38 is formed in the stepped portion 14 of the pedestal, and a collar 39 fixed approximately at the center of the set screw is housed in the recess 38 to prevent it from coming out.

In the case of FIG. 5, the sprocket 30 is placed behind the pedestal, and the chain 3 is placed between it and the sprocket 31 fixed to the rear of the operating shaft 34 as shown in FIG.
3, and place the handle 3 on the front side of the operating shaft 34.
5, the sprocket and chain do not appear on the front side of the press brake, making it neat, and the beam can be bent by operating from the front side to correct deflection while improving the appearance.

[Effect of idea]

According to the present invention, by pressing the central part of the beam fixed on the lower mold holder with pins at both ends by a pressing means, the beam is curved in a horizontal plane, and the divided wedges are advanced according to this curve. It is possible to easily correct the deflection of the press brake by gradually reducing the Moreover, the pressing means may consist of a single set screw screwed into the front end of the center of the beam, or a pair or more set screws on the left and right spaced apart in the center, and a sprocket fixed to the ends of the set screws. , a chain between sprockets and an operating shaft at the end of the chain. In either case, deflection correction can be performed reliably and easily by moving one operating part.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the deflection correction device of the present invention, Figure 2
The figure is an exploded assembly view of Fig. 1, Fig. 3 is a perspective view showing the curved state of the beam, Fig. 4 is a deflection line diagram, Fig. 5 is a sectional view of a modification of the deflection correction device, and Fig. 6 is a cross-sectional view of a modified example of the deflection correction device. FIG. 5 is a partial plan view of FIG. 5; 1... Bed, 2... Ram, 3... Lower die assembly, 4... Upper die, 5... Lower die pedestal, 6... Beam, 7... Wedge, 8... Lower die holder, 12 …
...Front rising side, 16...Rising part, 20, 40
... Pressure screw, 24 ... Adjustment screw, 2
8 to 31... Sprocket, 32, 33... Chain, 34... Operating shaft.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a device for V-bending a long plate material using an upper mold at the lower end of the ram and a lower mold on the upper surface of the bed, ,
A beam 6 is fixed at both ends with pins 11, 11, and a large number of divided wedges 7 are arranged on the upper surface of the beam 6. Furthermore, at the center of the front edge of the lower mold holder 5 or at several places on the left and right of the center, A ram/bed deflection correction device for a press brake, characterized in that a beam pressing means is provided for curving the beam 6 in a horizontal plane so as to gradually reduce the degree of advance from the center portion to the left and right wedges 7. 2 The beam pressing means is a press screw 2 screwed into the front end of the beam 6 from the front rising side 12 of the lower mold holder.
0, a rising part 16 provided at the front end of the beam, and an adjusting screw 24 brought into contact with the wedge 7 from the rising part, in the press brake according to claim 1, Bed deflection correction device. 3. The ram/bed deflection correcting device in a press brake according to claim 1, wherein two set screws 20, 40 in the beam pressing means are provided at a distance from each other in the longitudinal center of the beam. 4 The set screw 20 has sprockets 28 to 31 at the front end.
and the chains 32 to 33 and the operating shaft 3.
4. A ram and bed deflection correction device in a press brake according to claim 3, which are interlocked via a press brake. 5 The set screw 40 is screwed into the rear end of the beam 6,
Sprocket 28-31, chain 32-3
3. A ram and bed deflection correcting device for a press brake according to claim 1 or 4, which is operated on the front side of the press brake using an operating shaft 34.