JPH0221135Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a mold clamping device in a press brake, and more specifically, to a plurality of clamp units for gripping and releasing an upper mold at the lower end surface of an upper apron. A movable block is provided on one side of the vertical groove into which the shank of the upper mold is inserted through an elastic tube that increases and decreases its volume by fluid pressure, and a movable block is installed on the other side wall of the vertical groove to insert the shank of the upper mold into the upper mold using the biasing force of the bullet. A mold clamp in a press brake, which is provided with a hook protrusion that protrudes toward a hook groove, and is provided with a plurality of dogs around a rotating shaft that resists the bullet from the base of the hook protrusion and sinks the hook protrusion into the side wall of the groove. It is related to the device.

[Technical Background of the Invention and Problems of the Prior Art] The technical background of the invention and problems of the prior art will be explained with reference to FIGS. 6 and 7.

General press brake 101 shown in FIG.
In this case, a lower die 103 is attached to a lower apron 105, and an upper die (punch) is inserted from above.
Upper apron (ram) with 107 attached to the lower end
109 is driven by a crank device 111 near both ends thereof to descend and bend the plate material placed on the lower mold 103 into a downward convex shape.

In this case, even if the height of the upper apron 109 is increased near the center to prevent the so-called "sagging phenomenon" in which the center curves away from the lower mold 103, the height of the upper apron 109 near both ends of the upper apron 109 is increased. Since the pressure is applied, the above phenomenon cannot be completely prevented.

Therefore, as shown in FIG. 7, an intermediary member called an intermediate plate 113 is provided between the upper apron 109 and the upper mold 107, and the intermediate plate 113 and the upper apron 1
A wedge member 115 is interposed between the upper die and the upper die near the center to curve downward.

However, as is clear from FIG. 6, the intermediate plate 113
Since the upper die 107 and the upper die 107 are connected by a large number of fastening metal fittings 117, there is an inconvenience that all of the large number of fastening metal fittings 117 must be operated every time the bending operation changes.

[Purpose of the invention] The present invention uses a remote-controlled fluid pressure device to operate multiple clamp devices and a manual dog around the rotating shaft when attaching and detaching the upper mold from the intermediate plate provided at the lower end of the upper apron. The aim is to liberate and tighten all at once.

[Summary of the invention] As shown in the following example, the outline of the invention is to provide a vertical groove in the lower end of the intermediate plate into which the upper die shank is inserted, and to increase the cross-sectional area of one side wall of the vertical groove using fluid pressure. A movable block for releasing and tightening the shank is provided between the shank and the other side wall of the vertical groove through an elastic tube that increases and decreases, and a hook protrusion is engaged in a hook groove provided in the shank of the upper mold by the biasing force of the ammunition. In other words, the upper mold can be attached to and removed from the intermediate plate all at once by recessing the upper mold from the wall surface of the other side wall using a dog provided around the rotation axis and releasing the upper mold at once. This is what I got.

[Detailed description of the invention] In the embodiment of the invention shown in FIGS. 1 and 2, the clamp unit 3 of the upper apron 1 of the press brake 101 is provided with an intermediate plate 7 via a wedge member 5. .

The wedge member 5 has, for example, two horizontal elongated holes 1 provided in a bracket 9 attached to the upper apron 1.
1 and 11 as one unit with bolts 13 and 13.
In the figure, it can be moved and positioned in the left and right directions.

As is clear from FIG. 2, the wedge member 5 has a horizontal upper surface and is sloped so that the height decreases toward the left, and the upper surface of the intermediate plate 7 is also machined to have a corresponding reverse slope. .

The wedge member 5 holds the bracket 9 by a bolt 13. If the bolt 13 is loosened slightly and the wedge member 5 is hammered to the left or right, the wedge member 5 can be removed.
changes its position horizontally to the left or right, and since the pointer plate 15 also changes left and right together with the bolt 13, the amount of movement can be read from the scale 17 provided on the front surface of the bracket 9.

Two bolts 19, 19 passing through the upper part of the intermediate plate 7
is the vertical long hole 2 provided on the front and back (left and right in Figure 1)
1, the intermediate plate 7 cannot move to the left or right, and is forced to move downward due to pressure from the slope of the lower surface of the wedge member 5, or the lower surface of the wedge member 5 and the upper surface of the intermediate plate 7 This will create a gap between the slope and the slope.

Next, a vertical groove 25 into which the upper die shank 23 is inserted is provided at the lower end of the intermediate plate 7, and one side of the vertical groove 25 has an L-shaped cross section extending over the entire length of the clamp unit 3. A bracket 27 is attached.

The L-shaped horizontal part of the bracket 27 and the vertical groove 25
A plurality of movable blocks 31 as shown in the upper half of the bottom view of FIG.
The horizontal hole 3 of the bracket 27 adjacent to the movable block 31 is provided so as to be movable toward and away from the movable block 31.
3 is provided with an elastic tube 35 made of rubber or the like.

The movable block 31 has an L-shaped bracket 2
A bolt 39 is installed in a vertical window hole 37 provided in the horizontal part of the shaft 7, and movement toward and away from the vertical groove 25 is possible only within the area of the window hole 37.

A plurality of hook protrusions 43 are provided near the lower end of the other side wall of the vertical groove 25 to engage with the hook holes 41 of the upper mold shank 23, and as shown in FIG. Therefore, it is biased towards the center of the vertical groove 25.

As shown in the lower half of FIG. 4, the hook projections 43 are a plurality of T-shaped blocks facing the movable block 31, and the shank portions of the movable block 31 are guided by five guide blocks 47. The shank portion of the hook projection 43 is guided by a guide block 49 in the same manner as shown in FIG.

As shown in FIG. 3, a round bar 51 is fitted into the intermediate plate 7 above the hook protrusion 43 to a length corresponding to each clamp unit 3, and a handle 53 is attached to the clamp unit 3 at one end. It is provided.

Further, since a male and female joint 55 is provided at the connecting portion of each clamp unit 3, by rotating the handle 53, the round bars 51 of all the clamp units 3 are rotated.

A downward round hole 57 of approximately the diameter of the round bar 51 is bored in the portion where the round bar 51 is located above the shank of the hook projection 43. A square hole 59 for attaching a bolt is provided approximately in the center and extends vertically through the hole.

In this bolt mounting square hole 59, a bolt that serves as a dog 61 is screwed onto the round bar 51 from below, and after the dog 61 is screwed in, the cover plate 63 that supports the hook protrusion 43 is screwed onto the round bar 51 from below. Guide block 49
It is screwed to.

As is clear from FIG. 4, the shank portion of the hook protrusion 43 is vertically penetrated by the square hole 59 for attaching the bolt, and as is clear from FIGS. A square tunnel 65 is provided toward the front of 7.

[Effect of the invention] Since the mold clamping device of the present invention is constructed as described above, the upper mold shank 23 and the longitudinal groove are connected to each other while the fluid pressure in the elastic tube 35 is lowered to atmospheric pressure. When either of the movable blocks 31 and the hook protrusions 43 are moved and engaged, the tapered portion of the upper end of the shank 23 of the upper mold is acted upon, and both the movable block 31 and the hook protrusion 43 are retracted into the vertical groove side wall.

In this way, the hook protrusion 43 engages with the hook hole 41 of the upper die shank 23 by the biasing force of the bullet 45, and will not fall even if the support of the upper die is stopped.

After that, fluid pressure is introduced into the elastic tube 35,
The upper die shank 23 is pressed against the opposite side of the vertical groove 25 of the intermediate plate 7 and is used for bending work of plate materials and the like.

To remove the entire length of the upper mold combined with the split molds from the clamp unit 3, release the fluid pressure to the elastic tube 35 to atmospheric pressure, and rotate the handle 53 with the upper mold supporting base prepared. Hook protrusion 43
The shank portion of the upper mold shank 23 may be pushed out to the outside by the dog 61 to escape from the hook hole 41 of the upper mold shank 23.

That is, in the conventional device, a large number of fastening fittings 117 are used.
We have created a clamping device that can be operated easily, quickly, and safely, eliminating the complexity, large amount of man-hours, and danger associated with manual operation.

In addition, when removing only a relatively short split mold that is less than the length of one hook protrusion 43 from the clamp unit 3, after lowering the fluid pressure in the elastic tube 35 to atmospheric pressure, insert the square tunnel from the front as shown in FIG. Insert a key with a curved tip into 65 with the tip in a horizontal position, place the tip of the key upright in the square hole 59 for attaching the bolt, and pull out the hook protrusion 43 forward. It also has the advantage of being able to be removed independently.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the clamping device of the present invention, Figure 2 is a sectional view of the clamping device of the present invention;
The figure is a front view, Figure 3 is a sectional view of the hook release device,
Fig. 4 is a cross-sectional view along the - arrow in Fig. 1, Fig. 5 is an enlarged explanatory view of the lower left end of Fig. 4, Fig. 6 is an explanatory front view of the press brake, and Fig. 7 is a cross-sectional view showing the prior art. It is. Explanation of symbols representing main parts of the drawings, 3...Clamp unit, 7...Intermediate plate, 25...Vertical groove, 35
...Elastic tube, 13...Hook protrusion, 51...
...Round bar, 61...Dog.

Claims (1)

[Scope of utility model registration request] A plurality of clamp units are used to grip and release the upper mold at the lower end surface of the upper apron, and a movable block is provided on one side of the vertical groove into which the shank of the upper mold is inserted via an elastic tube that increases and decreases the volume by fluid pressure. , a hook protrusion is provided on a part of the other side wall of the vertical groove to protrude toward the hook groove of the upper die by the biasing force of the bullet, and the hook protrusion is pushed into the groove by resisting the bullet from the base of the hook protrusion. A mold clamping device for a press brake, characterized by having a plurality of dogs around a rotating shaft that are recessed into a side wall.