JPH0890085A - Structure of rotary die - Google Patents

Abstract

PURPOSE: To surely hold a composite-shape sheet metal work and to prevent the forming precision from reducing by installing an auxiliary rotary die inside a rotary die and executing holding and releasing of the sheet metal work between the auxiliary rotary work and a fixing die. CONSTITUTION: A sheet metal work 9 is set and a rotary die 1 is turned to the opposite direction to the arrow mark X. An air cylinder 2 is operated, an auxiliary rotary work 3 is driven around a supporting axis 4. In this state, the other end parts 9a, 9b of the sheet metal work 9 are held surely between the step parts 7a, 7b of the fixing die 7 and the end parts 6a, 6b of the auxiliary rotary die 3. Accordingly, bending is executed against one end part 9c of the sheet metal work 9 with a pressing die 10 succeedingly, even the force of the direction to pull-out the sheet metal work 9 is applied, the sheet metal work 9 is held without being taken out and the trouble of the reduction of the shape precision of the work 9 is nothing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type structure for bending a corner portion of a sheet metal work having a three-dimensional curved surface such as a vehicle body panel of an automobile, etc., and particularly for a sheet metal work having a complicated shape. The present invention relates to a rotary type structure that can be gripped on a sheet to prevent deterioration of molding accuracy.

[0002]

2. Description of the Related Art In bending using a rotary die, as shown in FIG. 3, a sheet metal 60 is wound around the outer peripheral surface of a rotary die 50 shown in a perspective view in FIG. It is performed by pushing the one end portion 61 of the above in the direction of the arrow Y with the pressing die 52. After such bending, the pressing die 52 is retracted and the rotary die 50 is rotated about the axis O in the arrow X direction to move the sheet metal workpiece 60 to the arrow K.
The sheet metal workpiece 60 by pulling it out in the direction
Disengage from. Japanese Examined Patent Publication No. 3-41859 discloses an example of the rotary type as described above. As an example of applying the bending process using such a rotary die, there is a curved portion of the automobile panel 63 having a three-dimensional curved surface such as the quarter outer portion Q on the left and right side surfaces of the vehicle body shown in FIG. Since such a quarter outer part Q is a part integrally forming a joint part with the roof panel and a window part, it has complicated irregularities and it is necessary to use the rotary mold as described above. FIG. 4 shows a state in which the sheet metal work 60 constituting the quarter outer portion Q as described above is formed by the rotary die 50 at one end (joint portion with the roof panel) by the push die 52. In this case, since the sheet metal work 60 has a complicated shape, the other end portion 63 is bent in advance into the shape of the window frame (as shown in the figure), and the bent end portion 63 is supplied to the rotary die 50 to be fed to the other end. Performs press processing on parts. Here, the pads 64 and 65, which are a part of the fixed mold, support the sheet metal work 60 from the outside, and are made of a slightly flexible material so as not to scratch the sheet metal work 60.

[0003]

In the rotary type as shown in FIG. 4, the pad 65 and the rotary type 50 as shown in the figure.
While holding the sheet metal workpiece 60 between
When the one end portion 61 of the sheet metal work 60 is formed by advancing, the sheet metal work 60 is pulled out in the direction of the arrow 66 even if it is pressed by the pad 65, and the shape accuracy of the sheet metal work 60 deteriorates. In this case, sheet metal work 60
A mold piece (shown by a chain double-dashed line) extending from a fixed mold 62 that supports the rotary mold 50 from below in a gap 67 between the rotary mold 50 and the rotary mold 50.
It is conceivable to provide 68 to hold the sheet metal work 60 between the mold piece 68 and the fixed die 64 to prevent the sheet metal work 60 from being displaced, but when the gap 67 is narrow as shown in the drawing, That is also impossible. It is an object of the present invention to provide a rotary type structure capable of improving shape accuracy when a sheet metal work having a complicated shape as described above is formed by the rotary type.

[0004]

In order to achieve the above-mentioned object, the present invention is to rotate a columnar rotary die about its longitudinal axis during bending of a sheet metal work to rotate the rotary die and the fixed die. In the structure of the rotary type that grips and releases the sheet metal work between and, the rotary type is provided with an auxiliary rotary type that is driven to rotate separately from the rotary type, and between the auxiliary rotary type and the fixed type. The sheet metal work is gripped and released by means of a rotary structure.

[0005]

According to the present invention, since the rotary die is further provided with the auxiliary rotary die which is driven to rotate separately from the rotary die, the push die is inserted into the rotary die and the end portion of the sheet metal work is inserted. During the forming process, the auxiliary rotary die is driven so that the end of the auxiliary rotary die projects toward the gap between the rotary die and the fixed die, and the other end of the sheet metal work inserted into the gap. Can be gripped between the end of the auxiliary rotary mold and the fixed mold. Therefore, even if the pressing process is performed on one end of the sheet metal work by the pressing die in this state, there is no inconvenience that the sheet metal work is pulled out toward the pressing die and is displaced, and the forming accuracy of the sheet metal work is improved.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and are not intended to limit the technical scope of the present invention. FIG. 1 is a cross-sectional view showing a rotary type structure and its movement according to an embodiment of the present invention. As shown in FIG. 1, the columnar rotary die 1 is provided with an auxiliary rotary die 3 that is separately driven by an air cylinder 2 inside. That is, the auxiliary rotary mold 3 is rotatably supported by the support shaft 4 fixed to the rotary mold 1, and the air cylinder 2 connected to the auxiliary rotary mold 1 by the pin 5 provided on the auxiliary rotary mold 3. Is driven around the support shaft 4 separately from the rotary mold 1. In FIG. 1, the standby state of the auxiliary rotary die 3 is shown by a broken line, and the state after the rotational driving is shown by a solid line. In this example, when the auxiliary rotary die 3 is rotationally driven by the air cylinder 2, the end portions 6a and 6b of the auxiliary rotary die 3 are
It projects into the gap between the rotary mold 1 and the fixed mold 7, and in the standby state,
The ends 6a and 6b are configured to be housed inside the rotary mold 1 as shown in the drawing. As described above, when the auxiliary rotary die 1 is driven by the fixed die 7 and the end portions 6a and 6b thereof protrude into the gap 8, the end portion 6 is formed.
Step portions 7a and 7b for holding the other end portions 9a and 9b of the sheet metal work 9 are formed between a and 6b.

When the sheet metal workpiece 9 having the other ends 9a and 9b previously bent by the rotary die 1 and the pushing die 10 is bent by the pushing die 10,
The air cylinder 2 is driven to move the auxiliary rotary die 3 to its end 6
a, 6b are rotated to a position (broken line) housed in the rotary mold 1, and the rotary mold 1 is driven in a direction indicated by an arrow X until the recess 11 of the rotary mold 1 faces the fixed mold 7. Rotate with. In that state, since a large gap is present between the rotary mold 1 and the fixed mold 7, the other end portions 9a and 9b are previously formed.
The sheet metal work 9 that has been subjected to the bending process can be set along the fixed mold 7 as shown in the figure. Sheet metal work 9
When is set, the rotary die 1 is rotated in the direction opposite to the arrow X by the driving means (not shown), and the state shown in the figure is obtained. Here, the air cylinder 2 is operated, the auxiliary rotary die 3 is driven around the support shaft 4, and is rotated to the angle shown by the solid line in the figure. In this state, the other ends 9a and 9b of the sheet metal work 9 are connected to the steps 7a and 7b of the fixed mold 7 and the ends 6a and 6 of the auxiliary rotary mold 3, respectively.
It is firmly gripped with b. Therefore, the following die 10
Even if a bending process is performed on one end portion 9c of the sheet metal work 9 by the
Since the sheet metal work 9 is gripped without shifting, the shape accuracy of the sheet metal work 9 does not deteriorate. When the press working by the pressing die 10 is completed in this way, the pressing die 10 is retracted, the air cylinder 2 is operated, and the auxiliary rotary die 3 is housed in the rotary die 1 at its end portions 6a and 6b (broken line). ) Is rotated. After that, the rotary mold 1 is rotationally driven in the direction of arrow X by a driving means (not shown),
The recess 11 is rotated to a position facing the fixed die 7, so that the sheet metal work 9 after the bending process is easily taken out.

In the above embodiment, the rotary mold 1 is provided with one auxiliary rotary mold 3, but it is also possible to provide a plurality of auxiliary rotary molds 3 if necessary. In addition to the air cylinder 2 as described above, the auxiliary rotary mold 3 is driven by, for example, the auxiliary rotary mold 3 whose end portions 6a and 6b are always formed by springs (not shown).
Is urged in the direction in which it projects from the rotary mold 1,
As part of the auxiliary rotary die 3 rotates in the direction of the arrow X or in the opposite direction, a part of the auxiliary rotary die 3 comes into contact with the fixed die 12 or a cam (not shown) provided in the vicinity of the stationary die 12 to move the auxiliary rotary die 3 to its end portion. 6a,
It is also possible to adopt a structure in which 6b is rotated in the direction of being housed in the rotary mold 1. In this case, the auxiliary rotation type drive device is downsized and simplified.

Since the structure of the rotary die according to the present invention is configured as described above, when the sheet metal work is formed by the pressing die, the sheet metal work is pulled by the pressing die to cause a deviation. Inconvenience such as deterioration of molding accuracy is avoided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a rotary type structure according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a conventional rotary type.

FIG. 3 is a perspective view showing a state of bending processing by a conventional rotary die.

FIG. 4 is a perspective view showing a state of bending processing by a conventional rotary die.

FIG. 5 is a conceptual diagram showing a portion of an automobile panel that needs to be bent by a rotating die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotation type 2 ... Air cylinder 3 ... Auxiliary rotation type 4 ... Support shafts 6a, 6b ... Auxiliary rotation type end 7 ... Fixed type 8 ... Gap 9 ... Sheet metal work 10 ... Pushing type

Claims (1)

[Claims] 1. When a sheet metal work is bent, a columnar rotary die is rotated around its longitudinal axis to hold and release the sheet metal work between the rotary die and the fixed die. In the structure, the rotary die is provided with an auxiliary rotary die that is rotationally driven separately from the rotary die, and the sheet metal work is gripped and released between the auxiliary rotary die and the fixed die. The characteristic rotary structure.