JPS6359767B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a folding device that allows the effective mold width (upper mold length) of an upper mold to be changed according to the bending length of a processed plate material (work). machine, footjob bender,
This invention relates to a bending die changing device for bending machines such as press brakes.

[Prior Art] A panel made by bending each of the four sides of a rectangular worksheet at right angles can be used for cabinets, show cases,
Used in vending machines, freezers/refrigerators, air conditioners, computer units, various office machines, etc.
To make such a panel, use a press brake, wing bender (folding machine), coki bender (wipe bender), etc., and use a press brake, wing bender (folding machine), coki bender (wipe bender), etc. After bending the part, turn the workpiece in a plane and place the upper die (punch) on the inside of the short side bend.
Alternatively, it is obtained by matching the lengths of the clamp mold (hereinafter simply referred to as the upper mold) and bending the long side edges. For example, one short edge (or rising edge) of the workpiece is bent at a right angle (or nearly right angle), the workpiece is rotated 180 degrees on the handling table, the other short edge 37 is bent, and the short side After bending, the workpiece is rotated 90 degrees to bend one long edge, then rotated 180 degrees and bent the other long edge to make each of the four edges at right angles. It is folded and made into a product.

In the above process, when bending the long side edge, there is a rise due to the bending of the short side that has already been bent, so the upper die of the bending machine is adjusted from the long side length to the workpiece thickness. It is necessary to reduce the length of two pieces and avoid interference with the rising edge of the short side. Therefore, we prepare a number of upper molds with different mold widths, and perform manual work each time the width of the workpiece changes. was converting the type.

[Problems to be solved by the invention] In order to improve these drawbacks, the upper mold is made into a split type, and molds with different lengths are combined, and the required number of split upper molds is slid according to the length of the workpiece. A method is used to move the vehicle backwards and rotate it 180 degrees backwards. However, in the conventional device, the mold changing device described above is complicated and expensive. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a device that has a simple structure and allows easy conversion of the length of the upper mold.

[Means for Solving the Problems] The present invention consists of an upper mold body attached to the lower end of the ram, a split upper mold that is slidable in the mold length direction at the lower part of the upper mold body, and a large number of thin walls that are reversible. It consists of an upper die, a select pawl that can engage with the split upper die, a select pawl drive mechanism provided at the front of the upper die body, and an inversion mechanism that inverts a predetermined number of thin-walled upper dies. Move the split upper mold of the divided part to a position away from the processing position using the select claw, that is, outward along the upper mold body, and move it to the center by the width of the inverted thin upper mold to form a series of upper molds. This makes it easy to replace the mold.

For example, install 18 split upper molds with a width of 100 mm, two adjustable upper molds with a width of 50 mm, and 20 thin upper molds with a width of 2 mm.
If all of these split molds are used, the maximum mold width will be 2000 mm, and if 20 pieces of 100 mm width, 5 pieces of 50 mm width, and 0 pieces of 5 mm width are used, the minimum mold width will be 300 mm, and by selecting the combination of each upper mold, the width will be 5 mm. The length of the upper mold can be freely changed from the maximum to the minimum using the adjustment unit. Note that the work plate is usually 1 to 3 mm thick, so if the thin upper mold is 5 mm thick, the length of the upper mold will be 2.5 mm at both ends.
The workpiece length can be changed substantially within the above range.

[Example] Next, the present invention will be specifically described with reference to the drawings.
In the following example, a case where the present invention is applied to a folding machine will be explained, but it can also be applied to a press brake, a coki bender, etc.

FIG. 1 is a front view of the mold changing device of the present invention, and FIG. 2 is an enlarged cross-sectional view of the main parts. The movable die 3, which can rotate around the fixed end of the workpiece, is operated to bend the workpiece by 90 degrees or about 90 degrees.

Upper mold assembly The upper mold assembly 1 consists of an upper mold main body 5 attached to the lower end of the ram 4, a number of split upper molds 6 inserted in the lower part of the upper mold main body 5 so as to be slidable in the mold length direction, and a divided upper mold 6. A large number of thin-walled upper molds 8 are reversibly mounted in the center of a group of upper molds 6, a divided upper mold 6 and a thin-walled upper mold 8.
It consists of an adjustable upper mold 7 interposed between.

The split upper mold 6 is inserted into and supported by a dovetail groove 9 formed on the lower surface of the upper mold main body 5, and can be slid by a selection pawl drive mechanism A to be described later. A total of 18 divided upper molds 6 are used, each having a width of 100 mm, for example, 9 pieces in total, and a thin upper mold 8 with a width of 5 mm is interposed in the center thereof. This thin upper mold 8 is not inserted into the dovetail groove 9, but is inserted and supported by a spline shaft 11 horizontally suspended at the rear of the upper mold main body 5. The innermost divided upper mold 6 adjacent to the thin upper mold 8
has a recess 12 at the rear as shown in the plan view of Figure 4.
It has an adjustment upper mold 7 that moves forward and backward into this recess 12. This adjustment upper mold 7 has a width of 1/2 of the split upper mold,
In other words, it is 50mm wide.

Select claw A second dovetail groove 13 extending in the width direction is provided on the front surface of the upper die main body 5, and the select claw holder 1 is provided here.
Insert 4. As shown in FIG. 1, the holders 14 are arranged one each on the left and right, and are screwed into the respective screw rods 15 and 16. At the end of each screw rod is a die cutting cylinder CY1R.
and CY1L are arranged, and the central part of the rod is connected by a spline cylinder 17 and a spline 18. The left cylinder CY1L is connected to the piston rod 19 of the type selection cylinder CY2, and a sprocket 21 supported by a sliding key 20 is attached to the rod part following the right cylinder CY1R, and this is connected to the rotation drive mechanism 22. It is related to. In addition, the holder 14 is provided with a select claw 23 and cylinders CY3L and CY3R for operating the claws.
3 is advanced and recessed into the front end of the split upper mold 6, and in this state the screw rod is rotated, the split upper mold in contact with the select pawl 23 and a group of parts adjacent to the split upper mold are simultaneously removed. It can be moved to the left or right.

Split upper die As shown in Fig. 1, the split upper die 6 has a side slope part 24 formed on the left or right side to provide relief for the bent edge of the processed plate material (workpiece), and has a rod 2 inside.
5 is inserted. The tip of this rod 25 is fixed to the innermost split upper mold, and cylinders CY4L and CY4R for mold movement are arranged at the other end. As will be described later, this cylinder is operated when taking out the workpiece after bending and returning the mold width to the original width.

In addition, in Fig. 1, the tip of the rod 25 is shown fixed to the innermost upper mold, but as shown in Fig. 7, the rod 15 is screwed into each split upper mold 6 as a screw, and the rod 15 is screwed into each split upper mold 6 with cylinders CY4L and CY4R. The upper die 6 may be moved by rotating the rod screw. The upper adjustment mold 7 has a dovetail groove 26 extending laterally on the back as shown in FIGS.
A bulging portion 27 at the tip of the rod is fitted. The left cylinder CY5L is fixed to the bracket 28 provided behind the adjacent split upper mold, and the right cylinder
CY5R is fixed to a fixed bracket 29 (Figure 3).

Inversion Mechanism The inversion mechanism is shown in FIGS. 1 and 3. The thin-walled upper mold 8 has a circular portion 30 formed at the rear upper part of the mold and a spline groove 31 provided therein. The spline groove 31 is inserted into and supported by the spline shaft as shown in FIG. The right spline shaft 11 can be slid left and right by a selection cylinder CY6, and a rod 3 inserted into the center of the other spline shaft 11a is attached to its tip.
2 are connected and a stopper 33 is provided at the rod end. A pinion 34 is engaged with the spline shaft 11a, and is engaged with a rack 35 at the tip of the piston rod of the reversing cylinder CY7. In the state shown in FIG. 3, all the thin-walled upper molds 8 engage with the right spline shaft 11 and avoid engagement with the left rotational spline shaft 11a, so even if the cylinder CY7 is operated,
None of the thin upper molds 8 is inverted. Selection cylinder
By the stroke control of CY6, the spline shaft 11 is moved to the right by a predetermined number of sheets, and the thin-walled upper mold 8 is moved to the right.
After engaging the rotating spline shaft 11a,
When the cylinder CY7 is actuated, the engaged thin-walled upper mold 8 can be reversed as shown in FIG. Moreover, what is shown by the solid line in FIG. 6 is the attitude of the thin upper die 8 before the inversion, and the chain line shows the attitude at the end of the inversion.

In addition, Fig. 7 shows an enlarged exploded view of the main parts; in this case, the rod 25 is a screw rod, and the mold transfer cylinders CY4R and CY4L are used.
The upper die 6 is moved by pushing the screw rod. Other details are the same as in FIGS. 1 and 2.

When the above-mentioned cylinders are operated, for example, by NC control, this type of work can be automated.

Function Next, we will explain the case where the short side is bent and then the long side with a width of 785 mm is bent. First, the rotational drive mechanism 22
, rotates the left and right screw rods 15 and 16 via the sprocket 21, and selects the select pawl 2.
Move the distance between 3 and 23 to the 800mm position. Next, actuate the selection cylinder CY6 to move the spline shaft of the thin upper mold 8 three pieces from the left side, that is, (100-85) mm, to the right, and move the spline shaft 11,
Stop at the position where the joint 11a is moved 15mm to the right. In this case, the value less than 5 mm is rounded down. Next, the select claw actuating cylinders CY3L and R are operated to form a gap of 10 mm on each side where the split upper die 6 is 800 mm wide, as shown in FIG. Next, the rack pinions 35 and 34 are activated by the reversing cylinder CY7, and only three thin-walled upper molds are required.
After rotating by 180 degrees, the inner side is contracted by the select claws 23, 23 to eliminate the gap for the three thin-walled upper molds formed by rotating by 180 degrees, and the mold width adjustment of 758 mm is completed.

When bending the periphery of the workpiece into a U-shape, usually the first short side bending, the second short side bending by rotating the workpiece 180°, the first long side bending by rotating the workpiece 90°, and the first long side bending 180° the workpiece. is rotated to perform the bending according to the second long side bending order. After the bending of each long side is completed, the upper mold body is raised by about 5 mm, the left and right adjustment upper molds 7, 7 are moved back by the operation of cylinders CY6L, R, and the select claws 23, 23 are moved forward again to remove the mold. Activate cylinders CY1R and CY1L to reduce the entire mold by about 30 mm left and right by using the recess where the upper mold has retreated. By reducing the size of the mold, the bent edge on the short side can be punched out without interfering with the upper mold divided at both ends. After taking out the workpiece, the mold movement cylinders CY4L and R are activated to return the split upper mold to its original position, and the selection cylinder
The adjustment upper molds 7, 7 are advanced by CY6 to obtain a width of 758 mm, and are then prepared for processing.

[Effects of the Invention] As described above, since the present invention employs a split upper mold type and has a thin upper mold, the length of the upper mold can be changed almost faithfully depending on the length of the workpiece. In addition, when changing the length of the upper mold, it can be automatically operated by operating the select claw, reversing mechanism, and various cylinders attached to these, making it possible to significantly streamline workpiece bending work. be.

[Brief explanation of the drawing]

Fig. 1 is a front view of the mold changing device of the present invention, Fig. 2 is an enlarged sectional view of the main parts, Fig. 3 is an enlarged plan view of the reversing mechanism, Fig. 4 is a plan view of the adjustment upper mold mounting part, 5
The figure is also a side view, and Figure 6 is a side view of the reversing mechanism.
FIG. 7 is an exploded view of the main parts, and FIG. 8 is a front view of a portion showing a state in which a gap is formed in the upper die when bending the workpiece. 1... Upper die assembly, 2... Lower die, 3... Movable die, 5...
Upper mold body, 6... Divided upper mold, 7... Adjustable upper mold, 8... Thin upper mold, 12... Recess, 9, 13... Dovetail groove, 14...
Claw holder, 15, 16...screw rod, 1
1, 11a...Spline shaft, 23...Select claw,
34...pinion, 35...rack, CY1L,R...
Die cutting cylinder, CY2...Mold selection cylinder, CY3
L, R...Cylinder for selection claw operation, CY4L,
R...Mold movement cylinder, CY5L, R...Cylinder for adjusting upper mold advance/retreat, CY6...Cylinder for thin-walled upper mold selection,
CY7...Reversing cylinder.

Claims (1)

[Scope of Claims] 1. In an apparatus for bending the edge of a processed plate material into a U-shape or an L-shape by changing the length of the upper die according to the length of the processed plate material, the upper die is an upper die attached to the lower end of the ram. A mold main body, a large number of split upper molds slidably inserted in the mold length direction at the lower part of the upper mold main body, and a spline shaft suspended horizontally at the rear of the upper mold main body in the center of the group of split upper molds, A large number of thin-walled upper molds supported in a freely reversible manner, a select claw provided at the front part of the upper mold body and capable of engaging with the split upper mold, and a selector for moving the select claw to an arbitrary split upper mold position. 1. A bending mold changing device comprising a pawl drive mechanism and a reversing mechanism for engaging a desired number of thin-walled upper molds with the spline shaft and rotating the shaft by a predetermined angle. 2 The split upper mold adjacent to the thin-walled upper mold has a recess on the back surface, and moves forward and backward into the recess to cover 1/2 of the split upper mold.
2. The bending mold changing device according to claim 1, further comprising an adjustable upper mold that can adjust the width of the mold. 3. The bending die changing device according to claim 1, wherein each split upper die has an inclined surface portion formed on the left or right side to serve as a relief for the bent portion of the processed plate material. 4 The selection pawl drive mechanism consists of a screw rod horizontally suspended in the longitudinal direction of the upper mold body, a selection melon screwed onto the screw rod, and a selection cylinder for the split upper mold provided at the end of the screw rod. A bending die changing device according to claim 1, comprising: 5. The reversing mechanism consists of a spline shaft that inserts and supports a large number of thin-walled upper molds and can be slid by a selection cylinder, and a spline shaft for reversing rotation provided opposite to the spline shaft, and the reversal mechanism can be selected by operating the selection cylinder. 2. The bending mold changing device according to claim 1, wherein only the group of thin-walled upper molds having the same number of molds are engaged with a spline shaft for reversing rotation to be reversed.