JPH0116568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a corner upper die of a folding machine having an opening die that can rotate under its own weight.

[Prior art] Panels made by folding each of the four sides of a rectangular worksheet once or twice or more are used in cabinets, show cases, vending machines, freezers, refrigerators, air conditioners, computer units, various office machines, etc. It is used. To make such a panel, use a wipe bender, a wing bender, or a press brake to cut the short edges of a worksheet (hereinafter simply referred to as the work) into quadrilaterals. After bending the part, the workpiece is turned in a plane, and the long side edge is bent by aligning a clamp die or an upper die with the folding width that is aligned with the inside of the short side bend. For example, as shown in FIG. 10, after bending the edge of one short side 61 of the workpiece 60 into two stages (short side bending), turn the edge of the other short side 62 by 180 degrees on the handling table. Perform short side bending, then rotate the workpiece 90 degrees and bend the edge of one long side 63 (long side bending),
It is further rotated 180 degrees to bend the other long side 64. As a result, as shown in Fig. 11, the ends of each side are bent into a U-shape by the first bending E and the second bending H, respectively, resulting in a rectangular product with a width W and a length L. be done.

In the above processing, when the long side is bent, there is a U-shaped rise 68 due to the bending of the short side that has already been bent, as shown in Figure 10.
The length of the upper mold is the length of the long side minus the thickness of two workpieces, and the corner upper mold must be approached to the workpiece while avoiding interference with the rising edge of the short side. It is also necessary to prevent the upper corner mold (end mold) from getting caught on the rising edge 68 on the short side even when cutting the mold after bending the sides. For this reason, as in Japanese Patent Application Laid-Open No. 58-148021, pins are usually provided in the main body of the upper corner mold to attach the opening mold (rotating type).
After the bending is completed, the opening die is rotated inward by its own weight to avoid interference with the rising edges while cutting the die.

[Problems to be Solved by the Invention] In the case of the above-mentioned Japanese Patent Application Laid-Open No. 58-148021, the corner upper molds 71 disposed at both ends of the split upper mold 70 are opened by pins 74 to open the molds 72. Since the opening mold 72 is only rotatably mounted, in order to allow the opening mold 72 to rotate without any trouble, there is a gap at the edge of the corner upper mold body to avoid contact with the rotating part of the opening mold 72. 73 must be provided. However, since the upper die edge line is missing at this recess 73, the workpiece 60 bent at that part has a concave portion 65 on the outside and a convex portion 66 on the inside of the bending line, as shown in Fig. 9. There was a problem that the bent shape could not be formed accurately.

Therefore, an object of the present invention is to provide an apparatus that allows an edge line to be continuous without providing a gap between the lower part of the main body of the upper corner mold and the open mold, and also facilitates mold removal.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a central horizontal pin on the inside of the lower part of the upper corner mold body, attaches a pair of opposing links, and The opening die is supported by the opening die, and a rod is erected at the center of the upper surface of the opening die and is loosely inserted into a guide hole in the corner upper die body. Further, the opening mold has a cavity to avoid interference with the end face of the adjacent divided upper mold when the opening mold rotates outward from the divided upper mold group, and the lower part of the cavity is formed on the adjacent divided upper mold. A flat surface is formed in contact with the end surface of the mold.

[Function] When the ram is raised, the opening mold attached to the corner upper mold main body via links and rods is suspended by its own weight in an inclined state to the outside of the split upper mold. When the ram is lowered, the opening die touches the workpiece before the split upper die and rotates relatively so that it is on the same level as the split upper die row, and then the split upper die touches the workpiece and becomes the opening die. An edge line with the split upper mold is formed continuously. In this state, the workpiece can be bent by applying pressure to the ram. After the bending is completed, when the ram is raised, the open die guided by the guide hole as directed by the link is lifted tilted outward from the split upper die, so that both ends have the rising parts that were bent earlier. Even in the case of a workpiece, it can be smoothly cut out. In addition, the opening mold and the adjacent split upper mold are brought into close contact with each other without creating gaps or reliefs in the edge portions to form a continuous edge line, so all bending lines are accurately aligned without leaving any traces of mold connection. Can be bent.

[Example] Fig. 1 is a front view of a press brake equipped with a mold length conversion device, Figs. 2 and 3 are enlarged front views and side views of main parts, and 10 is a frame;
11 is a front plate, 12 is a cylinder provided on the left and right sides of the frame 10, 13 is a ram attached to the cylinder 12 so that it can be raised and lowered, 14 is a bed on the upper surface,
15 is a slide provided on the bed 14, 16
is the lower mold (die), 17 is the V formed on the lower mold 16
18 is a back gauge, 19 is a T-shaped groove formed at the lower end of the ram, and 20 is an upper die (punch) group.

The upper mold group 20 includes a large number of divided upper molds 21,
It includes corner upper molds 22 arranged at both ends of a row of upper molds 21 arranged in series. These upper mold groups 20 can change the length of the upper molds by inverting, retracting, or removing a required number of upper molds in the central portion, but the details of these parts are omitted from illustration. In preparation for changing the length of the upper mold, each upper mold is mounted so as to be movable in the mold length direction by inserting the upper mold upper part into the groove 19 at the lower end of the ram as shown in FIG.

As shown in an enlarged view in FIG. 4A, the corner upper mold 22 has a main body 23 that is approximately half the height of the adjacent divided upper mold 21.
and an opening mold 24 attached to the lower part thereof.
The edge 25 of the split upper die 21 and the edge 26 of the open die 24 form a series of edge lines with no step or gap. The opening die 24 is detachably attached via a link 30 provided on one side of the corner upper die body 23. That is, the bracket 2 is attached to the lower corner of the main body 23 on the side that contacts the split upper mold 21.
7 is installed vertically, and a pin 28 is inserted through the bracket 27 in a direction perpendicular to the bending line to connect the link 30.
is attached, and the opening die 24 is suspended using a pin 29 at the tip of the link. As shown in FIG. 4A, the one-opening die 24 has a recess 31 to avoid interference with the rising edge 68 of the bent workpiece on the end side of the workpiece when viewed from the front, and the portion facing the end surface 36 of the split upper die 21 has a substantially trapezoidal shape. It has a blank space 32.

A rod 34 having an upper head 33 formed thereon is implanted into the upper surface of the one-open mold 24. Opposing the rod 34, a guide hole 35 is bored inside the main body 23 to accommodate the rod 34 with the head 33 when the opening mold 24 is closed. The space 32 of the opening die 24 has a slope 37 that comes into contact with the end surface 36 of the adjacent split upper die 21 during die cutting to prevent further rotation. A slope 38 is provided that approaches asymptotically from the slope 37 toward the edge 25 of the upper mold, and a vertical flat surface 39 is formed closer to the end face 36 from the slope end. This flat surface 3
9, when the split upper mold 21 and the corner upper mold 22 are in close contact with each other as shown in FIG. form.

Next, the operation of the above device will be explained.

The four side edges of the worksheet 90, which has been previously cut into a substantially rectangular shape as shown in FIG. 10, are bent into a U-shape as follows. First, the edge of one short side 61 is bent in two steps to form a U-shape, and then the workpiece is rotated 180 degrees into a plane on a handling table (not shown) and the other short side 62 is folded in the same way. bend. When bending these short sides, there is no need to adjust the mold length, and the upper mold length may be set to be larger than the short side length. Next, the workpiece is rotated 90 degrees to bend the edge of one long side 63, and further rotated 180 degrees to bend the other long side 64. As a result, the 11th
The product is as shown in the figure.

In the above processing, when the long side is bent, the short side is bent to create a U-shaped rise 68
Because of this, it is necessary to adjust the length of the upper mold. In addition, it is necessary for the upper corner die to approach the workpiece while avoiding interference with the riser 68, and to prevent the upper corner die from getting caught on the riser 95 when cutting the die after bending the long sides. . The present invention can meet all of these demands.

When bending the long side ends as described above, the required number of split upper molds 21 and the corner upper molds 22 at both ends are lined up according to the length of the workpiece to form a series of upper molds, and then the ram 13 is bent. It descends and bends the end of the workpiece.

In the case of the upper corner die 22 as shown in Fig. 4A, the open die 24 is supported by the link 30 and falls diagonally inward as shown by the chain line in the figure until it touches the workpiece from the ram lifting position. It is in an upright position. Open type 2
If the ram 13 is lowered while the ram 4 is tilted as shown by the chain line, the opening mold 24 will touch the work 60 before the split upper mold without hitting the work rise 68, and the fourth
It rotates through the attitude shown in Figure B to the attitude shown by the solid line in Figure 4A. Next, when the split upper mold touches the workpiece, the flat surface 39 comes into close contact with the end face 36 of the adjacent split upper mold, and the edges 25 and 26 are arranged on the same line, as shown by the solid line in FIG. 4A. In this state, the ram is further pressurized and lowered to bend the workpiece as shown in Figure 3. In this way, the edges 25 and 26 of the divided upper mold and the corner upper mold have no gaps, so they can withstand a large load and can be bent along accurate bending lines as shown in FIG. After bending, Ram 13
When the rod 34 is raised, the open die 24 suspended via the link 30 due to its own weight tries to rotate around the pin 28, but the head 33 of the rod 34 is guided by the hole 35, and at the beginning of the rotation, , vertical descent (for example, 3 to 5 mm) is restricted. Due to this vertical descent, the flat surface 39 of the opening mold is removed from the end surface 36 of the split upper mold 21, and from then on it rotates around the pin 28, and stops when the slope 37 hits the end surface 36 of the split upper mold 21. , it returns to its original state and can be cut out without being caught by the rising edge 68.

FIG. 5 shows a modification of the upper corner mold in which the opening mold can be forcibly pulled up. In this case, an arm 41 is provided upward from the rotation fulcrum side pin 28 of the link 40, and an air cylinder 43 is arranged inside the main body 23 in a direction parallel to the edge line.
A piston rod 44 fitted into the cylinder 43
The tip of the arm 41 faces the inner end of the arm 41.

FIG. 5 shows the state before and after the split upper mold 21 touches the workpiece and begins the bending process. The piston 44 is stationary at the left end, and the opening mold 24
It is on the same level as 1. Ram 13 in this state
When the opening die 24 is raised, the opening die 24 supported by the link 40 and guided by the rod 34 and the guide hole 35 tilts as shown by the chain line due to its own weight, so that the die can be cut without interfering with the workpiece rise 68. . After the ram is removed from the die, while the ram is rising or after it has been raised and left still, pressurized air is supplied to the inlet port 45 of the air cylinder 43 to move the piston 44 to the right, and the arm 41 is pulled up from the position shown by the chain line to the position shown by the solid line. By this lifting, the edge line 26 of the open mold and the edge line 25 of the split upper mold
are lined up in a straight line. In this way, the opening mold 24 can be raised to the same level as the split upper mold in the raised position, so the auxiliary upper mold can be rotated from the front or rear surface of the upper mold row to approach and overlap, as in Japanese Patent Publication No. 60-29570. (or flip-up type, not shown) can be used.

FIG. 6 shows a press brake using a gooseneck type upper die. The lower half of the gooseneck type upper mold 50 is thin, but the pin 5 is attached to the relatively thick upper part of the same upper mold.
8 and using links 52, rods 53, etc., the same effect as shown in FIG. 4A can be achieved.

Although the illustrated example shows the case of a press brake, the present invention can be applied to a wing bender (folding machine) and a coki bender (wiping bender).

[Effects of the Invention] As described above, the present invention does not have a gap at the edge line between the corner upper mold and the divided upper mold, so the workpiece can be bent along a clean bending line without leaving any traces of joining the molds. Can be done. Furthermore, during bending, the end face of the split upper mold and the flat surface formed near the edge of the open mold of the corner upper mold are brought into close contact, so that it can withstand a large load and improves bending accuracy. Furthermore, as the ram rises after bending is completed, the opening die is guided by the rod and descends vertically, and after releasing the contact between the flat surface and the end face of the split upper die, it moves to the outside of the upper die row around the fulcrum of the link. It rotates obliquely, thereby avoiding interference with the rising part of the workpiece bent into a U-shape and allowing smooth die cutting.

[Brief explanation of drawings]

Figure 1 is a perspective view of the bending machine, Figure 2 is a front view of the upper mold group, Figure 3 is a side view, Figure 4A is an enlarged front view of the corner upper mold, and Figure 4B is Figure 4A. Enlarged front view showing the operating state of the upper corner mold in FIG.
The figure is an enlarged front view showing another embodiment of the corner upper mold, FIG. 6 is a sectional view when applied to a gooseneck-shaped upper mold, FIG. 7 is a front view of the upper mold group in the conventional device, and FIG. The figure is a partial cross-sectional view of a product processed using the corner upper die of the present invention, Figure 9 is a partial cross-sectional view of a product processed using a conventional device, Figure 10 is a perspective view of a worksheet, and Figure 11 is a product panel. It is a perspective view showing an example. 21...Divided upper mold, 22...Corner upper mold, 23...
...Same body, 24...Opening type, 25, 26...Edge, 30...Link, 32...Vacancy, 34...Rod, 35...Guide hole, 37...Slope, 39...
...Flat surface.

Claims (1)

[Claims] 1. Corner upper molds 22 arranged at both left and right ends of a group of divided upper molds in a bending machine in which the length of the upper mold can be freely changed.
The upper corner mold 22 has a main body 23 and an opening mold 2.
4, a link 30 is attached to the inside of the lower part of the upper corner mold body 23, the opening mold 24 is rotatably supported at the tip of the link 30, and a rod 34 is erected at the center of the upper surface of the opening mold 24. A corner upper die for a bending machine, which is inserted into a guide hole 35 in a corner upper die main body 23. 2. The opening mold 24 rotates outward from the divided upper mold group when the opening mold 24 rotates outward from the divided upper mold group.
6, and a lower part of the cavity 32 has a flat surface 39 in contact with the end surface 36 of the adjacent split upper mold 21. Corner top mold of bending machine.