JPS58168440A - Blank holder device in plate bending machine - Google Patents

Abstract

PURPOSE:To easily manufacture a box-shaped work, by constituting a titled device of a pair of left and right Blank holders freely movable in the horizontal direction, and a moving device for moving the Blank holders in the direction for bringing them close to each other or separating them from each other. CONSTITUTION:On a Blank holder device in a plate bending machine, many Blank holders 19 which are freely movable in he horizontal direction and form each one pair by left and right ones, and when a hydraulic cylinder expands and contracts, a lifting block 14, a slide block 17 and the Blank holder 19 move up and down as one body, and pinch a work plate. The Blank holder 19 is supported by the slide block 17, and on the end part being near the center of the slide block 17, an inclined face 17a having the same inclination as an inclined face 23a is formed, along which a projecting line 25 fitted into a groove 24 is formed. Accordingly, when the inclined face 23a moves up and down as a lifting body 23 lifts, the left and right slide blocks 17, namely, the Blank holders 19 are drawn toward the center and are separated.

Description

[Detailed description of the invention] The present invention relates to a blank holder for a plate bending machine.

When using a plate bending machine to manufacture a box-shaped workpiece (5) whose four sides are folded in a U-shape as shown in Fig. 1, the two opposing sides (a) ( 1)) is
As shown in Figure 2, if you leave a wide recess inside the bending blade (1) or blank holder (2), you can bend it freely.
(d) If you try to bend the 2
The folded portion of sides (a) and (kl) becomes a bulge, and the workpiece (a) can be held between the blank holder (2) and the top surface of the counter blade (3), as shown in Fig. 1. A box-shaped workpiece could not be easily manufactured using a plate bending machine.

Therefore, the present invention provides a blank holder device in which the left and right ends of the blank holder along the bending blade can be brought closer to or moved away from the center of the blank holder itself, and thereby, for example, as described above. The aim is to make it possible to easily manufacture even box-shaped workpieces using a plate bending machine.

Next, the blank holder device of this invention if? An example of the plate bending machine provided will be explained based on the drawings.

Figures 8.4 and 5 are a plan view, a front view, and a side view omitting the mounting table (4) and conveyor device (5), which will be described later, of the entire curved plate, and (6) is a work plate ( (4) is a mounting table for the work plate (A), (5) is a conveyor device for carrying in and out of the work plate (A), and (5) is a conveyor device provided continuously to the conveyor device (6) across the mounting table (4). .

A conveyor device (8) that is raised and lowered by a lifting device t (7).
) is a run 1 that can freely move back and forth, which cranks the work board (goods) carried from above and below to the center of the table (4) by the conveyor device (5) (6) and sends it to the main body of the board bending machine (9). In the device, the crank 1 device (8) has a crank 1 head (11) that rotates, and a work plate (
Rotate 90 degrees or 180 degrees while cranking (a), make each side of the work plate (to) face the plate bending machine body (9) in turn, and insert the opposite sides into the body (9). It is now possible to do so.

(1) The bending tool in the U plate bending machine body (9), (8
)ri counter blade.

Next, the blank holder device (12) of the present invention will be explained in detail.

In Figures 6 and below, (18) is the main body frame of the board curved rock, and the front surface of the core main body frame (13) is formed with four cylinder parts (18a)'. , the protruding rod portion (14a) Th is inserted and supported, and an elevating block (14) is provided which is movable up and down with respect to the frame (18). The lifting block (14)
It is connected to the cylinder rod (16) of a hydraulic cylinder (15) provided on the U-frame (18), and moves up and down as the hydraulic cylinder (15) expands and contracts.

The lower surface of the lifting block (14) is provided with a pair of left and right slide blocks (14) that slide over the lower surface of the elevator block (14).
7) (17) is supported via T g (18)'i, and the slide block (17) (1,7
) has a large number of blank holder blocks (19) Th of different widths which are removably and closely attached (2).
1) There is. Each blank holder block (19) is formed in the shape of an inverted anvil extending inwardly, and by placing them closely together as described above, the continuous bottom surface (19a) of the blank holder block (19) is One blank holder (2) facing the counter blade (3)
By expanding and contracting the front dC hydraulic cylinder (15), the lifting block (14) and the slide block (17) j? The above-mentioned flank holder block (19) moves up and down as one body to sandwich the work plate (5).

Then, the nuclear blank holder block and lock (19) T-supported slide block (17) U can be moved laterally in the following manner.

That is, a hydraulic cylinder (22) is installed upright in the center of the front 6-pin lifting block (14), and the hydraulic cylinder C
A complex-shaped elevating body C28) as shown in Figure 2 is fixedly connected to the end of the cylinder rod (22&) of 22), and both sides of the lower part of the elevating body (28) have slopes tapering downward. (28a), and a groove (24) along the diagonal (2814L) is formed in the center of the slope (28a).

An inclined portion (17a) having the same inclination as the inclined surface (28a) is formed at the end portions of the left and right slide blocks (17) from the center, and the inclined portion (17a) has the same slope as the inclined surface (28a).
A protrusion (25) that fits into the # (24) is formed along the slope of the slide block (17a).
) holds and engages the inclined portion (17a) with the inclined surface (2B1L) of the elevating body (23), and lifts the elevating body (28).
), the vertical movement of the slope (28a) causes the left and right slide blocks (17) to be pulled toward the center (dotted chain line in the off figure) and moved away from each other to separate positions away from the center. 1'' (solid line in the off-line diagram).

(26) It is a holding block for U outside n stop, (27
) is a stopper for positioning the lowest position of the elevating body (2B), (28) is an entry recess for the crank head (11) drilled in the front face of the elevating body (C28), and C29) i is also the elevating body (C28). 23) is a guide protrusion of the work plate (5) protrudingly formed on the front surface of the work plate (5).

In addition, the bottom surface (23a) of this elevating body (28) is formed flat, and when the elevating body (2B) is lowered to the lowest position (disaster line in Figure 77), the elevating body (28) The bottom of (2
) (28a) and the left and right blank holder blocks (1
9) is almost continuous with the bottom surface (19a) of
Two blank holder orientations are formed.

N: &-, (81) This is the hydraulic cylinder for vertical movement of the U-bending blade (1). Since the plate bending machine of this example is configured as described above, it is shown in Fig. 1 as follows. A box-shaped workpiece as shown (IM
) can be manufactured.

That is, first, two opposite short sides (a) (b) f of the work plate (a) cranked by the crank 1 device (8)
Each was bent twice to make it look like the OIO diagram.
Next, the lifting block (14) is slightly raised, and the workpiece (W) is folded back in a U-shape from both sides as described above.
One long side (C) k, U-shaped folded part (a)
(b) passes through the left and right recesses (19b) of the blank holder block (19) (off diagram I! chain line) and the blank holder block (19) and counter blade (
8) Insert between.

Then, the bending blade (1) rises and falls, the workpiece (5) is pushed in, and the bending blade (1) rises and falls?
If you do this in order, the long side (C) will also be bent twice and folded back into a U-shape. Next, the hydraulic cylinder (22) will be fully contracted to raise the four lifters (28). The slide block (17) 2 and a part of the blank holder block (19) will be drawn to the center, and the actual length of the blank holder (2) will be reduced. ) Once moved forward so that the bent part (C) forming the ridge (C) does not get caught, raise the lifting block (14) and raise the blank holder (2) completely.
Fold it back and pull it up without getting caught by a) (1)) (C).

Therefore, next, the frang device! (8) to pull out the work plate (5) and rotate it, and perform the same operation? By repeating this process, the remaining sides (d) can be folded back, and a box-shaped workpiece (a) as shown in FIG. 1 can be manufactured.

In the case of the above example, the workpiece (5
), but if the blank holder (2) is constructed by combining the blank holder blocks (19) with different widths as described above, the blank The length of the holder (2) can be easily adjusted to a length close to 7, depending on the length of the workpiece.

In addition, in the above explanation 3, the lower blade of the bending blade (1) was used to bend the workpiece (5) upward 1911. As is clear from the above explanation, the blank holder device of the present invention can move the left and right ends along the bending blade towards the center of the blank holder itself or move them away from each other. Is it possible to use the corresponding holder? When lifting the blank from the workpiece or lowering it onto the top surface of the workpiece, the actual length of the workpiece can be increased or decreased. It becomes possible to easily manufacture such workpieces.

Also, as in the above row, the crank Ht of the workpiece whose clamp head rotates and moves backward by rm relative to the main payload of the plate bending machine.
If it is installed, the rotation of the workpiece can be done automatically, and 4
The work of folding the sides into a U-shape can be done quickly and automatically in one process.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a workpiece in a state where bending is completed, FIG. 2 is an explanatory diagram showing the bending process r, FIG. 3 is a schematic plan view of a plate bending machine equipped with the blank holder device of the present invention, and FIG. The figure is also a schematic front view, and Figure 5 is a schematic diagram 11 with some parts omitted as well.
! I side view, O 6 IE front view of the μ blank holder device The off view is an enlarged front view of the main parts, and Figure 8 is the ■- of Figure 6.
■- line sectional view, Figure 9 is off view ■-IX line @- figure 1
Figure 0 is a perspective view showing the bending process of the workpiece. ... Elevating body (28a) ... Slope (
24) ...Groove (25) ...Protrusion 1st
0 mouth 1 mouth 8 Figure 1/. P79i 1'/a

Claims (1)

[Claims] A pair of left and right blank holders that can be moved horizontally,
A blank holder device for a plate bending machine, comprising a blank holder moving device that moves the blank holders toward each other or in a direction away from each other.