JPS6320123A - Press brake with reciprocal bending mechanism - Google Patents

Abstract

PURPOSE:To contrive to expedite a reciprocal bending work by providing a vertically movable side tuck on a ram, fixing an upper die for reverse bending on its top end, then disposing a recess for the reverse bending on an upper surface of a holding member for a lower die. CONSTITUTION:The side truck rod 15 is provided to the front face of a ram 10 attached the fixed upper die 11 to engage with a pinion 16. Then, a rod 23 and a tilting cylinder 25 are provided on the rear face of the ram 10, and also the recess 9 for preventing interference on the lower die block 4. First of all, while the upper dies 17, 27 for R bending, reverse bending are held the upper limit, the ram 10 is lowered to perform normal bending, then after the rod 23 is lowered by driving with a pinion 24, a guide frame 22 is tilted to lower the ram 10, the reverse bending is performed by the upper die 27. In this case, because the up bending and down bending are performed continuously without turning over the work, the normal and reverse bending work are performed quickly.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to a rack pinion in which a person '3 < 5t lL' is mounted vertically in front or behind a ram to which an upper mold is attached.
The present invention relates to a press brake that can continuously reverse bend 11111 plate materials (workpieces) by installing a reverse bending die that can be moved () on the machine.

[Prior Art] In performing the bending process 1 of the thin 111A root, conventionally used press brakes (31, die) and -l type 2 (punch) were used. There is a force that bends the workpiece into a V-shape between the two, but it is possible to bend the workpiece twice in the same direction, and when bending the workpiece in the forward and reverse directions. Don't reverse (J must have 7, it was complicated and required skill. So, Jikoaki! 19-54h3
As shown in the publication, Ram's F 3Mj
+, -j" A rotating upper mold that can be reversed is installed behind or on the front and rear sides of the mold 2, and the combination of the 11 and 11 molds enables quick forward and reverse bending without the need for reversing the workpiece. -Folding machines have been developed that can

[Problems to be Solved by the Invention] However, in the above-mentioned folding machine, the reversing rotating upper mold is directly applied to the rear or front and rear surfaces of the ram to generate oil L [cylinder [1]. Since the rotating upper mold is rotated by J, the radius of the rotating upper mold that is reversed becomes the working radius when it is reversed, and therefore, there are no other processing tools or back gauges within that range. 1 cannot be installed, and it becomes necessary to take a thick 2I oil cylinder (=t t), which is not only inconvenient, but also installs a reverse rotation on the front of the ram. The doki had drawbacks such as the large reversing action that often put the worker in danger.

For the latest bending machines, the
J shown in the official gazette: Sea urchin, the rear surface of the ram or both the front and rear sides of the ram has a four-joint shaft rotated by a hydraulic cylinder, and an auxiliary upper mold is installed on the extension of the rotating link of the link mechanism G-+, a type that does not invert from the auxiliary upper mold has been developed. However, in a bending machine using this four-bar link mechanism, the auxiliary upper mold is brought into contact and separated by rotating the 7'Iw link mechanism, so the link and the auxiliary upper mold are approach and remove other equipment.
It is not possible to increase the second limit position of the auxiliary upper die unless the length of the rotation link is increased, and the more the length of the rotation link is increased, the more the rotation link becomes operational. There is an advantage that the radius also has to be large. Therefore, the upper limit avoidance position of the auxiliary upper mold defined by the rotation link length cannot be set too high, and as a result, there is a risk that the edge of the workpiece and the mold will interfere with each other when transferring the workpiece between bags. there were.

The present invention eliminates all of the drawbacks of the prior art as described above, and allows quick reverse bending of the WE from the play of the table. The object of the present invention is to provide a press brake that can be moved vertically by a rack and pinion without being reversed during an avoidance operation.

[Means for solving problem fish 1 To achieve the above object, the present invention provides the lower end of the ram]
- In a press brake with a mold attached and an upper mold attached to the top surface of the bed, a nid rack is installed on the front or rear surface of the ram (including both front and rear surfaces) that can be guided by a guide frame and moved vertically by a pinion. , a soil mold for reverse bending is fixed to the end extension of the side rack, a recess for reverse bending is formed in the lower filj holding member corresponding to this upper mold, and a recess for reverse bending is formed between the guide frame and the ram. The main point is that a cylinder for shifting the upper mold for bending is provided.

[Example] Next, an example of the present invention will be specifically described with reference to the drawings. The apparatus shown in the drawings includes a ram 10 that is vertically movable above a bed 1.

On the bed 1-1-, a base plate 2 which is movable in the horizontal direction in the figure is placed on the bed 1-1. For strain absorption () - B part month 3
A block 4 is disposed via the block 4. Furthermore, first and second lower molds 7.8 having working grooves 5.6 for R-bending and V-bending are provided at the front part of the block 4. In addition, at the rear of the block 4, there are four places that guide the overhanging part 34 of the upper mold 27 for reverse bending attached to the rear surface of the ram 10 as described later, and that serve as relief for the bent part W1 of the workpiece W. 9 is provided.

On the other hand, a fixed upper die 11 for V-bending is provided at the lower part of the ram 10. At the front of this ram 10, brackets 12 are installed on both side frames. The plate 12 has a guide frame 14 that can rotate about a horizontal axis 13.
is provided, and a lid rack rod 15 that can move vertically is mounted inside this guide frame 14. side rack rod 15
A pinion 16, which is rotatably supported by the horizontal shaft 13, is engaged with the shaft. Further, a rack rod (not shown) is attached to the pinion 16 symmetrically with the rack rod 15,
A rack driving cylinder (not shown) is connected to this. A support 18 for supporting an R-bending mold 17 having a semicircular cross section is fixed to the extended end of the side rack rod 15. Further, a tilting cylinder 19 is disposed between the bracket 12 and the side frame 14 in order to shift the R-bending mold 17 to a normal use position as will be described later.

On the rear surface of the ram 10, browns 20 are provided on both 4" id frames. This bracket 20 is provided with a guide frame 22 that can rotate around a horizontal axis 21,
A side rack rod 23 that can be moved vertically by a pinion is installed within this guide frame 22. A pinion 24 supported by the horizontal shaft 21 is engaged with this →noid rack rod 23. Also, for this pinion 24, a rack rod (not shown) is symmetrical with the side rack rod 23. A pinion drive cylinder (not shown) is also connected to this. Reference numeral 25 is a tilting cylinder disposed between the plaque 20 and the guide frame 22. This cylinder is used to tilt the guide frame 22 and shift an upper mold 27 for reversing, which will be described later, to a normal use position. Reference numeral 26 denotes a support body for the reverse upper die 27 attached to the tip of the side rack rod 23.

A downwardly opening circular arc-shaped four part 28 is formed at a position facing the lower die block 4 at the lower part of the support body 26, and a V-shaped part 27 for reverse facing with a semicircular cross section is inserted into this. There is. This upside-down soil mold 27 has a V-shaped opening that opens downward. !
The groove 29 is on the right side, and a pin 30 is protruded from both end surfaces of the 1-type, and the pin 30 is engaged with an arcuate ring 32 formed on both side walls 31 of the recess 28 to form an upper surface for reversing. The mold 27 is supported so as to be rotatable in angle. In the illustrated embodiment, the four parts 28
A plate holding member 33 is fixed to the support body 26 adjacent to the support body 26, and a projecting portion 34 that contacts the guide member 9a of the recess 9 of the lower die block 4 is integrally provided on the support body 26.

Note that the reference numeral 35 in the figure indicates an abutting piece for the back cage.

In the above press, when bending the workpiece W into a V shape, first, as shown in FIG. 8-H, and after regulating the protruding distance from the bending position with the back gauge abutting piece 35, the ram 10 is lowered. Since a V-bending groove 6 is formed on the upper surface of the lower mold 8, it is decided to avoid lowering the ram 10, and perform ten-bending (positive bending) of the workpiece as shown by the imaginary line in Fig. 1. .

On the other hand, when bending the workpiece downward (reverse direction), the second
As shown in the figure, after the side rack rod 23 is vertically lowered to a predetermined position by driving the pinion 24, the shift cylinder 25 is operated to tilt the guide frame 22 at a predetermined angle.
- Bring the support 26 of the inverted soil mold 27 into close contact with the mold 11; Thereafter, the ram 10 is lowered to touch the tip of the reverse die 27 to the workpiece W as shown in FIG. In this case, when the ram 10 is lowered, the end of the plate holding member 33 comes into contact with the vicinity of the edge of the workpiece W, and as the ram continues to lower, the left acting portion 27 of the upper die 27 for reverse direction
a hits the plate holding member 33 and the counterclockwise rotation of the reverse upper mold 27 is prevented, then the reverse upper mold 27 is rotated to the right in FIG. Perform F-bending of the workpiece as shown below. As shown in the figure, the corners of the lower die main body 8 are made at a slightly acute angle of 90° in consideration of springback. Due to this simultaneous movement of the upper die for reversing, the bending Wl of the edge of the workpiece can be bent and rotated within the recess 9 of the block 4 without any hindrance. As shown in FIG. 3, during bending, the protruding portion 34 of the support comes into contact with the vertical guide surface 9a of the recess to properly lower the upper die 27 for reversing and support the bending reaction force. After bending, this upper mold 2
7 to a predetermined avoidance position. First, the shift cylinder 25 is operated to return the guide frame 22 to its original position, and then the pinion 24 is driven to move the side rack rod. 23 along the ram to a predetermined avoidance position.

FIGS. 4 and 5 show the middle of R-bending the workpiece W. In this case, the lower mold 7 for R bending is moved to the bending fit position, and the reverse mold 27 is avoided and raised to the upper limit position as shown in the figure, and then the workpiece W is moved to the bending fit position. After the protruding distance from the bending position is determined using a back gauge, the side rack rod 15 is slid downward. Then, actuate the tilting cylinder 19,
The support 18 is brought into close contact with the upper die 11 by rotating the upper die 17 for bending by a predetermined angle (about the horizontal axis 13). Thereafter, by lowering the ram 10, the workpiece W can be bent as shown in FIG.

Figures 78 to 7D show the bent shape (-example) of the workpiece W when starting from the opposite direction. In the figure, symbol a indicates an upper bent piece, and b indicates a bent piece. In other words, Fig. 7A-10= has J and rims formed on the right-angled surface, and the 7th
Figure B shows an example in which, following the processing of the edges in Figure 7A, a Jz edge a is formed on the ``-'' bend, and 7 bends are made in the opposite direction. 7C and 71], the side a is formed by bending at [ and -[] in the third and fourth processing operations following the processing shown in FIG. 7B.

In the case of double-bending the workpiece as shown in the figure, even when the bending radius of the upper bending piece a is large, the movable upper die attached to the front or rear of the fixed upper die will The workpiece is guided by the guide frame to a height that does not come in contact with the workpiece, and is pulled heavily along the rack and pinion along the reram, avoiding interference with the workpiece and the TJ movable mold. Continuous bending becomes possible.

4T, in the example shown, a reverse bending mold is required on the rear surface of the ram.
H], but remove it on the front or both front and rear sides ('N
t t-JruJ: You can also do it. In addition, in this embodiment, an R-bending mold is attached to the front surface of the ram, but it is also possible to replace this with a normal gooseneck-shaped upper mold, and furthermore, by changing the angle of the mold.

It is possible to change several types of angles, including not only vertical angle bending but also acute angle bending.

[Efficacy of invention! l! 1 If the sea urchin described above is used in the present invention, remove the upper mold from the tip.
Since the upper die for reverse bending is installed on the front or rear side of the ram, it can be lowered freely, so there is no need to reverse the workpiece! Bending and bending can be performed continuously without any problems.

In particular, according to the present invention, the upper mold for reverse bending can be moved vertically back and forth along the rim of the rack without using the rotation link. The avoidance of the movable mold can be greatly increased.Therefore, the risk of interference between the mold and the workpiece is extremely reduced. In addition to being able to perform bag bending continuously, it also has the effect of being able to accommodate changes in the bending length.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the main parts of the press of the present invention, Figs.
:J side view, Figures 4 and 5 show the state immediately before reverse bending of the workpiece, respectively. ? Side views showing the intermediate states, Figure 6 is the first
Enlarged sectional view taken along the line Vl-Vl, Figures 78 to 71
The second figure is an explanatory diagram showing the bent shape of the workpiece. 1...Bed, 2...Base play 1~. 3...
Wedge member, 1... 11 blocks, 5.6... Full V bending action, 7.8... Lower mold, 9... Recess, 10...
・Ram, 11...Fixed upper mold, 12...Bracket 1~
．． 13...Horizontal axis, 14...Guide frame, 1:j...
1 Noid rack rod, 16...pinion, 17...R
Upper mold for bending, 18... Support body, 19... Tilting cylinder, 20... Bushkets 1 to . 21...Horizontal axis, 22
...Guide frame, 23...Swidrak rod, 24.
...Pinion, 25...Tilt cylinder, 26...
Support body, 27... Soil mold for reverse bending, 28... Four arcuate parts, 29... V-shaped surface, 30... Pin, 31... Side wall, 32... Arc-shaped groove, 33... Temporary holding member, 34・
... Overhang, 35... Abutment Ii, W... Work. Applicant: Maru Kikai Kogyo Co., Ltd., 1st generation, Masaaki Masayuki Figure 1 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. In a press brake having upper and lower molds for bending a workpiece, and a back gauge abutment piece for regulating the bending position of the workpiece, A side rack that is guided by a guide frame and moved vertically by a pinion is installed on the front or rear surface of the ram, which has an upper die attached to its tip and can be raised and lowered vertically. A press brake with a forward/reverse bending mechanism that fixes an upper mold and has a recess for reverse bending on the upper surface of a lower mold holding member. 2. The press brake according to claim 1, wherein the guide frame has an upper shift cylinder for reverse bending between the guide frame and the ram.