JP2908858B2 - Upward forming mold for punching - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a punch press such as a turret punch press for forming an upward flange at a peripheral portion of a hole formed in a work. And an upward molding die for punching.

(Prior Art) Conventionally, for example, a turret punch press as a punch press has upper and lower turrets rotatably supported on upper and lower frames, respectively. A plurality of punches are mounted on the circumference of the upper turret, and a die corresponding to the punch is mounted on the circumference of the lower turret.

Then, in one set of the plurality of pairs of punches and dies, an upward molding die for forming a flange at a peripheral portion of a hole formed in the work is attached to the upper and lower turrets to form a flange. Is being done. In addition, the conventional upward molding die has a structure in which the downward movement of the press is simply stroked to form the flange.

(Problems to be Solved by the Invention) By the way, the upward flange height is affected by the working space of the press. That is, since it is necessary to satisfy the material feeding space (the range in which the workpiece can move), which is the space between the lower surface of the upper turret and the upper surface of the ejector plate forming a part of the die device mounted on the lower turret, and the space of the die, There was a problem that the height was limited and only low products could be made.

SUMMARY OF THE INVENTION An object of the present invention is to provide an upward molding die for punching, in which the height of a flange can be formed larger than in the past, in the same state as a processing space (die space) in order to solve the above problems. Is to do.

[Constitution of the invention] (Means for solving the problems) In view of the above problems, the present invention relates to an upward molding die for punching comprising an upper die device and a lower die device, wherein the upper die The apparatus is provided with an upper mold movably provided in an upper mold guide provided movably up and down and biased downward, and the lower mold apparatus is opposed to the upper mold. An ejector provided in the center of the lower mold holder so as to be vertically movable and biased downward, and provided so as to surround the upper mold and face the upper mold guide. The plate is provided so as to be vertically movable and urged upward, and semicircular cams are rotatably provided in respective concave grooves formed at a plurality of positions of the lower mold holder. The ejector is provided with a convex portion in contact with the lower surface of the lower mold on the upper surface. The lower end surface of the ejector pin that vertically to the lower surface of the rate is a configuration in which a contact with the convex portion.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, for example, a turret punch press as a punch press is provided with upper and lower frames (not shown), and upper and lower frames are provided with a rotatable upper turret 1 and a lower turret 3. It is supported. In addition, the upper turret 1 and the lower turret 3 are rotated synchronously by a known drive device.

A plurality of upper mold devices are mounted on the circumference of the upper turret 1, and a lower die device is mounted on the circumference of the lower turret 1 at a position corresponding to the upper die device. I have. FIG. 1 shows the upper turret 1 as the upper mold device 5 and the lower turret 3 as the upward molding die in this embodiment.
It is attached to.

That is, the upper die guide 11 is mounted in the mounting hole 9 of the upper turret 1 so as to be movable up and down by a known structure. Inside the upper mold guide 11, there is provided an upper mold 15 constantly urged downward by an elastic member 13 such as rubber or a spring.

On the other hand, the lower die unit 7 is provided in the mounting hole 17 of the lower turret 3.
Is mounted. This lower mold holder comprises a first holder member 19A and a second holder member 1A.
9B, a through hole 21 penetrating in the vertical direction is formed in the axial center portion of the first holder member 19A, and a step groove 23 larger than the through hole 21 is formed below the through hole 21. Is formed. The second holder member 19B is formed with a plurality of concave grooves 25 that are open upward.

A vertically movable lower die 27 is mounted from below in the through hole 21 penetrated by the first holder member 19A, and a flange portion 27F formed at a lower portion of the lower die 27 is mounted in the step groove 23. I have.

An ejector plate 29 is provided above the first holder member 19A, and a through hole 31 penetrating in the up-down direction is formed in an axial center portion of the ejector plate 29. A step groove larger than the through hole 31 is provided below the through hole 31.
The stepped groove 33 is adapted to engage with a flange portion 19F formed on the upper portion of the first holder member 19A when the stepped groove 33 is lowered.

Each concave groove 25 formed in the second holder member 19B is provided with, for example, a cam 35 as a vertical movement device. The shape of the cam 35 is a semicircle inscribing the bottom surface and the left and right inner side surfaces of the concave groove 25, and symmetrical convex portions 37 and 39 project from both ends in the inner and outer directions of the upper surface.

At a position of the first holder member 19A corresponding to the convex portion 37, a through hole 41 penetrating vertically is formed,
An ejector pin 43 that is screwed to the ejector plate 29 and protrudes downward is attached to each through hole 41,
It is slidable up and down.

Moreover, the lower end surface of the ejector pin 43 is
Is in contact with the convex surface portion 37 of the main body. The convex portion 39 of the cam 35 is in contact with the lower end surface of the lower mold 27.

The first holder member 19A and the second holder member 19B are formed with through holes 45 and 47 at the same position, respectively, and the ejector plate 29 corresponding to the through hole 45 has
A bolt 49 is inserted from the through hole 47, and the tip of the bolt 49 is screwed.

Plates 51 and 53 are provided below the second holder member 19B.
An elastic device 57 having an elastic member 55 such as rubber or a spring interposed therebetween is provided, and the plate 51 is always in contact with the lower end of the second holder member 19B by the urging force of the elastic member 55. . Further, through holes 59 and 61 penetrating vertically are formed at the same positions of the plates 51 and 53,
A bolt 63 is inserted from underneath 1 and the first holder member 19A and the second holder member 19B are integrated with the bolt 63. In addition, the head 63T of the bolt 63 fits into a groove 65 formed below the through hole 61 in the plate 53, so that the plate 53 does not drop downward.

Through holes 67, 69 penetrating in the vertical direction are formed in the axial center portions of the second holder member 19B and the plate 51,
A bolt 71 is inserted from below the through hole 69, and the tip of the bolt 71 is screwed to the lower mold 27. In addition, a spring 73 is interposed between the head of the bolt 71 and a groove formed in the lower part of the second holder member 19B. The spring 73 is always urged downward, and The lower end surface of 27 is in contact with the upper end surface of second holder member 19B.

With the above configuration, the work W is placed on the lower mold 27 such that the center of the hole H in which the work W is formed in advance is located at the axis of the lower end 27.

In this state, the upper mold guide 11 is pushed up by a striker (not shown), and the upper mold guide 11, the upper mold 1
5 contacts the ejector plate 29 and the lower mold 27, respectively.
The work W is clamped. Further, when the upper mold guide 11 is pushed down, the ejector plate 29 is pushed down against the urging force of the elastic member 55, so that the lower end of the ejector plate 29 comes into contact with the upper end of the first holder member 19A and the ejector plate 29 is ejected. The pin 43 is also pushed down and the cam as a vertical movement device
Pressing the convex surface 37 of 35, the cam 35 rotates counterclockwise,
With the convex portion 39, the lower mold 27 is pushed upward against the urging force of the spring 73.

As a result, from when the ejector plate 29 is pushed down, upward flange forming is started on the periphery of the hole H formed in the workpiece W, and further, the lower mold 27 moves upward, and the upper mold 15 moves. Is lifted by the amount of movement against the biasing force of the elastic member 13, and the state shown in FIG. 2 is formed, whereby the upward flange is formed.

After the upward flange is formed, when the upper die guide 11 is raised in the state shown in FIG. 2, the ejector plate 29 is raised by the urging force of the elastic member 55, and the lower die 27 is attached with the spring 73. As a result, the cam 35 rotates clockwise to return to the original state as shown in FIG.

Therefore, in a state where the material feeding space L between the lower end surface of the upper turret 1 and the upper end surface of the lower mold 27 is the same as that of the related art, the second holder member 19B serving as the lower mold holder is mounted on the cam as the vertical movement device. 35, and the lower mold 27 is attached to the first holder member 19A.
, The mold space is doubled, for example, so that the height of the flange can be made twice as high as in the past.

[Effects of the Invention] As can be understood from the above description of the embodiments, in short, the present invention provides an upper mold device (5) and a lower mold device (7).
In the upward forming die for punching, the upper die device (5) is provided with an upper die (15) movably up and down in an upper die guide (11) provided movably up and down. The lower mold device (7)
A lower mold (27) provided opposite to the upper mold (15) is provided at the center of the lower mold holder (19) so as to be vertically movable and urged downward to provide the upper mold. An ejector plate (29) surrounding the (15) and facing the upper mold guide (11) is provided movably up and down and urged upward to provide an ejector plate (29). A semicircular cam (35) is rotatably provided in each of the concave grooves (25) formed at a plurality of locations of the above, and on the upper surface of each of the cams (35), on the lower surface of the lower mold (27). A projection (39) is provided in contact with the projection (39), and a projection (37) is provided in contact with the lower end surface of an ejector pin (43) vertically provided on the lower surface of the ejector plate (29).

Therefore, according to the present invention, at the time of forming the work, the upper mold 15 and the lower mold 27 press the work at the time of forming the work, and the periphery thereof is pressed by the upper mold guide 11 and the ejector plate 29. In this state, upward molding is performed. Therefore, it is possible to effectively prevent wrinkles and the like from occurring in the forming part of the work.

In addition, since the ejector plate 29 is lowered by the upper mold guide 11 and the lower mold 27 is raised by the action of the ejector pins 43 and the cam 35, the forming process of the workpiece is performed. The relative upward stroke of the mold 27 is the sum of the downward stroke of the ejector plate 29 and the upward stroke of the lower mold 27. That is, even if the downward stroke of the upper die guide 11 is small, the relative upward stroke of the lower die 27 can be increased, and the upward molding can be performed with higher accuracy.

Further, the cam 35 has a semicircular shape, and the convex portion 37 abutting on the lower end surface of the ejector pin 43 suspended from the ejector plate 29 and the convex portion 39 abutting on the lower surface of the lower mold 27 are formed by the cam 35. With the configuration having the upper surface formed, the cam 35 can be easily formed and the overall configuration can be reduced in size.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which an upward molding die according to one embodiment of the present invention is mounted on a turret of a turret punch press, and FIG. 2 shows an upward flange formed at a peripheral portion of a hole previously formed in a work. It is operation | movement explanatory drawing of a state. 1 upper turret 3 lower turret 5 upper mold device 7 lower mold device 11 upper mold guide 13 elastic member 15 upper mold 19 lower Mold holder 19A… First holder member 19B… Second holder member, 25… Recessed groove 27 …… Lower mold, 29 …… Ejector plate 35 …… Cam (vertical movement device) 43 …… Ejector pin, 55 …… Elastic member 71 …… Spring

Claims (1)

(57) [Claims] 1. An upward forming die for punching comprising an upper die device (5) and a lower die device (7), wherein the upper die device (5) is provided to be vertically movable. Guide (1
1) An upper mold (15) is provided inside the upper mold (15) so as to be vertically movable and biased downward. The lower mold apparatus (7) is provided to face the upper mold (15). The lower mold (27) is provided at the center of the lower mold holder (19) so as to be vertically movable and urged downward to surround the upper mold (15). An ejector plate (29) provided opposite to (11) is provided so as to be vertically movable and urged upward, and each recess groove (25) formed at a plurality of locations of the lower mold holder (19). A semicircular cam (35) is rotatably provided in the inside, and the lower mold (2) is provided on the upper surface of each of the cams (35).
7) is provided with a convex surface portion (39) in contact with the lower surface and a convex surface portion (37) in contact with the lower end surface of an ejector pin (43) suspended from the lower surface of the ejector plate (29). An upward molding die for punching, characterized by being provided.