JP2011067824A - Rotary cam type pressing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary cam type pressing device capable of immediately separating a negative angle forming die from a negative angle-formed work. <P>SOLUTION: The rotary cam type pressing device includes: a lower die 2 for holding the work W; a rotary cam 3 turnably arranged at the lower die and having the negative angle forming die 30, and a slide plate 7 turnably pivoted in a seesaw manner at the lower die and capable of pressing the rotary cam from a front end side 7a. A suspension cam 10 is arranged along the slide plate to be forwardly moved. When the suspension cam moves forward along the slide plate, the front end side of the slide plate presses the rotary cam, and the suspension cam is made to be in a pressing contact state to the negative angle forming die. When the suspension cam retreats, the pressing state of the slide plate to the rotary cam is released, and the rotary cam is turnable in a direction for separating the negative angle forming die from the work. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a press device that performs negative angle forming such as bending work on an end portion of a plate-like workpiece, for example, and more particularly to a rotary cam press device.

For example, in the manufacturing process of automobiles, when negative angle forming such as bend processing is performed on an end portion of a plate-like workpiece, a rotary cam type press device has been conventionally used as shown in Patent Document 1.
The structure of a conventional rotary cam type press device will be described with reference to FIGS. FIG. 9 is a sectional view showing an operation state of a conventional rotary cam press, and FIG. 10 is a flow showing the operation flow.

In the rotary cam type pressing device 50 shown in FIG. 9, a rotary cam 52 having a substantially arc-shaped cross section is rotatably provided in a cam groove 51 a of a lower mold main body 51. Rotational power is applied in a predetermined direction (clockwise in FIG. 9).
Further, the lower mold 51 is provided with a punch 53 on which a plate-like workpiece W is fixed and held, and the rotary cam 52 is formed with an end surface 52a for holding the workpiece W together with the punch 53 when the workpiece is processed. . The rotary cam 52 is formed with a machining surface 52b having a predetermined cross-sectional angle with the end surface 52a.

  The rotary cam 52 is provided with a slide plate 54 on the surface facing the processing surface 52b. The slide plate 54 guides the processing blade 55a of the upper suspension cam 55 that has been moved downward from above to the rotary cam 52. It is configured to be.

In such a conventional rotary cam type press device 50, when the workpiece W is set on the punch 53, the upper suspension cam 55 starts to move vertically downward.
9A, when the machining blade 55a of the upper suspension cam 55 comes into contact with the slide plate 54, the rotary cam 52 is caused by the pressing force of the upper suspension cam 55 larger than the rotational force by the cylinder 56 in the drawing. The counterclockwise rotation is started (step S1 in FIG. 10).

As shown in FIG. 9B, when the slide plate 54 comes into contact with the lower mold 51 and the rotation of the rotary cam 52 stops (step S2 in FIG. 10), the machining blade 55a of the upper suspension cam 55 is brought into contact with the slide plate 54. It slides along and starts to advance toward the machining surface 52b of the rotary cam 52 (step S3 in FIG. 10). At this time, the upper surface of the punch 53 and the end surface 52a are substantially flush with each other.
As shown in FIG. 9C, when the sliding movement of the upper suspension cam 55 reaches the bottom dead center (the lowest stroke point), at the same time, the end of the workpiece W is sandwiched between the machining blade 55a and the machining surface 52b. As a result, the negative angle forming is completed (step S4 in FIG. 10).

When the negative angle forming of the workpiece W is performed, the machining blade 55a of the upper suspension cam 55 starts to move obliquely upward along the slide plate 54 as shown in FIG. 9D (step S5 in FIG. 10). Thereby, the processing blade 55a is separated from the processing surface 52b.
When the backward movement of the machining blade 55a of the upper suspension cam 55 is completed, as shown in FIG. 9E, the upper suspension cam 55 moves vertically upward, and accordingly, the rotary cam 52 rotates in the return direction (clockwise). Then, the end surface 52a is separated from the workpiece W, and the workpiece W can be removed (step S6 in FIG. 10).

JP-A-11-226672

As described above, in the conventional rotary cam type press device, the rotary cam 52 is rotated (by the driving force of the cylinder 56) in order to eliminate the negative angle state of the processed and formed workpiece end, and the processing is performed. The surface 52b is separated from the workpiece W.
However, if the upper suspension cam 55 does not move vertically upward by a predetermined distance, the rotary cam 52 cannot be sufficiently rotated to eliminate the negative angle state, and the workpiece W is pulled up from the rising timing of the upper suspension cam 55. The timing was late.
As a result, there is a problem that the settable range of timing for lifting the workpiece W is limited, and the setting is difficult.
In addition, a member such as a spring for delay adjusting the lifting timing of the workpiece W is required for the upper mold, and there is a problem that the cost increases.

  The present invention has been made paying attention to the above points, in the rotary cam type press device that presses the upper suspension cam against the negative angle forming mold formed on the rotary cam and forms the negative angle of the plate-like workpiece, It is an object of the present invention to provide a rotary cam type press device capable of pulling the negative angle forming die away from the negative angle formed work.

  In order to solve the above-described problems, a rotary cam type press device according to the present invention is a rotary cam type press device that presses an upper suspension cam against a negative angle forming die via a work and performs negative angle forming of the work. A lower mold for holding the workpiece, a rotary cam provided on the lower mold, and having a negative angle forming mold, and rotatably supported in a seesaw shape in the lower mold, A slide plate capable of pressing the rotary cam by a front end side, the upper suspension cam is provided so as to be capable of moving forward along the slide plate, and the slide plate is moved by the upper suspension cam moving forward along the slide plate. The front end side of the slide plate presses the rotary cam so that the upper suspension cam can be pressed against the negative angle mold, and the upper suspension cam moves backward to move the front of the slide plate. Pressing state is released against the rotary cam, wherein the rotary cam in a direction which the negative angle forming die is pulled away from said workpiece characterized in that the rotatable.

Note that, in the slide plate pivotally supported in the seesaw shape, it is preferable that a fulcrum on which the slide plate rotates is provided on the front end side.
In addition, the negative angle forming die includes a rotation drive unit that turns the rotary cam in a direction in which the negative angle forming die is pulled away from the workpiece, and the upper suspension cam moves forward along the slide plate. It is desirable that the pressing force to the rotary cam is larger than the rotational force of the rotation drive unit.
Further, it is desirable that the lower mold is provided with an impact buffering member that allows the upper suspension cam to slide when the upper suspension cam advances along the slide plate.

By configuring in this manner, the negative angle forming portion is already separated from the workpiece at the start of raising the upper suspension cam, and the workpiece can be pulled up at least simultaneously with the upper suspension cam.
As a result, the settable range of timing for lifting the workpiece is widened, and the setting operation can be facilitated.
Moreover, since a member for delaying adjustment of the workpiece lifting timing is not required as in the prior art, the cost can be reduced and the production efficiency can be improved.

  According to the present invention, in a rotary cam type pressing device that presses an upper suspension cam against a negative angle forming die formed on a rotary cam to form a negative angle of a plate-like workpiece, the negative angle is formed from the workpiece formed with a negative angle. It is possible to obtain a rotary cam type pressing device capable of pulling the mold immediately.

FIG. 1 is a plan view schematically showing a lower mold of a rotary cam type press device according to the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is a flow showing a flow of a series of operations of the rotary cam type press device of FIG. FIG. 5 is a view for explaining an operation state of the rotary cam type press device of FIG. 1. FIG. 6 is a view for explaining an operation state of the rotary cam type press device of FIG. 1. FIG. 7 is a view for explaining an operation state of the rotary cam type press device of FIG. 1. FIG. 8 is a diagram for explaining an operating state of the rotary cam type press device of FIG. 1. FIG. 9 is a diagram for explaining an operation state of a conventional rotary cam type press device. FIG. 10 is a flow showing a flow of a series of operations of a conventional rotary cam type press device.

  Hereinafter, embodiments of the present invention will be described based on the embodiments shown in the drawings. FIG. 1 is a plan view schematically showing a lower mold of a rotary cam type press device according to the present invention, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. It is B arrow sectional drawing. 2 and 3 show an upper suspension cam provided on the upper mold.

First, the configuration will be described with reference to FIGS. 1 and 2. The rotary cam press 1 includes a lower die 2, and the lower die 2 is provided with a cam groove 2 a having an arc surface. In the cam groove 2a, a substantially circular columnar rotary cam 3 is rotatably mounted.
A punch 4 for holding the workpiece W is provided on the lower mold 2, and the rotary cam 3 has an end surface 3 a that is substantially flush with the workpiece holding surface of the punch 4 when the workpiece is molded. ing. The rotary cam 3 is formed with a machining surface 3b having a predetermined cross-sectional angle with the end surface 3a. The end face 3a and the processed surface 3b constitute a negative angle forming die 30.

The rotary cam 3 is connected to an air cylinder 5 (rotation drive unit), and a rotating force in a predetermined direction (clockwise in the figure) is always given by the air cylinder 5.
In addition, on one end side of the rotary cam 3, a slide plate 7 pivotally supported in a seesaw shape by a support member 6 is rotatably provided on the lower mold 2 on the side facing the processing surface 3 b of the rotary cam 3. It has been. More specifically, the fulcrum 6a on which the support member 6 pivotally supports the slide plate 7 is provided close to the front end side 7a of the slide plate 7, so that when the external force is not applied, the rear end is caused by the weight of the rear end side 7b. The side 7b is inclined so as to contact the lower mold 2.

  Further, an upper suspension cam 10 attached to an upper mold (not shown) is provided above the lower mold 2 so as to be movable up and down vertically and obliquely. At the tip of the upper suspension cam 10 is provided a processing blade 10a for sandwiching the end W1 of the workpiece W between the processing surface 3b of the rotary cam 3 and performing a bending process.

  When the slide plate 7 is pressed downward by the upper suspension cam 10, the front end side 7a of the slide plate 7 presses the pressed surface 3c of the rotary cam 3 to rotate the rotary cam 3 counterclockwise (cylinder 5). And a path for guiding the machining blade 10a of the upper suspension cam 10 to the machining surface 3b of the negative angle forming die 30 is secured.

Next, the configuration will be further described with reference to FIG.
On the other end side of the rotary cam 3, the slide plate 7 and the support member 6 are not provided, and a stopper member 8 (impact buffer member) on which the upper suspension cam 10 can slide during workpiece processing is provided on the lower mold 2. .
By providing the stopper member 8, the impact from the upper suspension cam 10 on the slide plate 7 and the support member 6 can be buffered.
The rotary cam 3 is provided with a slide plate 9 that is continuous with the sliding surface of the stopper member 8 when the upper suspension cam 10 slides along the stopper member 8.

A series of operations of the rotary cam press device 1 configured as described above will be described with reference to FIGS. 5 to 8 based on FIG.
First, as shown in FIGS. 5A and 6A, when the workpiece W is set on the punch 4, the upper suspension cam 10 starts moving vertically downward (step ST1 in FIG. 4).

As shown in FIG. 5B and FIG. 6B, when the descending upper suspension cam 10 contacts the slide plate 7, the distal end side 7 a of the slide plate 7 presses the pressed surface 3 c of the rotary cam 3. Here, the pressing force by the slide plate 7 is larger than the rotational force by the cylinder 5, and the rotary cam 3 rotates in the direction opposite to the direction of the rotational force by the cylinder 5 (counterclockwise in FIG. 4) (step ST2 in FIG. 4). ).
Then, as shown in FIGS. 5C and 6C, a path to the processing surface 3 b is secured along the slide plate 7.
At this time, since the upper suspension cam 10 contacts the stopper portion 8, the impact from the upper suspension cam 10 on the slide plate 7 is buffered.

When the path to the processing surface 3b is secured along the slide plate 7, the processing blade 10a of the upper suspension cam 10 moves forward (obliquely downward) along the slide plate 7 toward the processing surface 3b (in FIG. 4). Step ST3).
Then, as shown in FIGS. 7A and 8A, when the upper suspension cam 10 reaches the bottom dead center and completes advancement, the machining blade 10a of the upper suspension cam 10 is pressed against the machining surface 3b, and the workpiece The negative angle forming of the end W1 is completed at the same time (step ST4 in FIG. 4).

After processing the workpiece W, the upper suspension cam 10 starts to retreat in a direction of returning obliquely upward as shown in FIGS. 7B and 8B. As a result, the slide plate 7 supported in a seesaw shape immediately tilts toward the rear end side 7b. At this time, the pressing state of the front end side 7a of the slide plate 7 against the rotary cam 3 is released, and the rotary cam 3 starts to rotate (clockwise in the figure) by the rotational force of the cylinder 5.
As a result, the negative angle forming die 30 (end surface 3a and processed surface 3b) of the rotary cam 3 is pulled away from the work W, and the negative angle state of the work end is eliminated (step ST5 in FIG. 4).

When the upwardly retracting movement of the upper suspension cam 10 is completed, the upper suspension cam 10 starts to move vertically upward as shown in FIGS. 7C and 8C (step ST6 in FIG. 4).
At this time, since the negative angle state at the end W1 of the workpiece W has already been eliminated, the workpiece W is pulled away from the punch 4 and started to move upward as the upward suspension cam 10 starts to rise.

As described above, according to the rotary cam type press device according to the present embodiment, the seesaw-like slide plate 7 is provided on the lower mold 2, and the rotary cam 3 is pressed by the slide plate 7 when the upper suspension cam 10 moves forward. Then, it is turned into a state where negative angle molding is possible. Further, as the upper suspension cam 10 starts to move backward, the pressing state of the slide plate 7 against the rotary cam 3 is released, and the rotary cam 3 is rotated in a direction in which the negative angle forming die 30 is pulled away from the workpiece W.
As a result, when the upper suspension cam 10 starts to rise, the negative angle forming portion 30 is already separated from the workpiece W, and the workpiece W can be pulled up at least simultaneously with the upper suspension cam 10.
As a result, the settable range of timing for lifting the workpiece W is widened, and the setting operation can be facilitated.
In addition, since a member for delaying the lifting timing of the workpiece W is not required as in the prior art, the cost can be reduced and the production efficiency can be improved.

DESCRIPTION OF SYMBOLS 1 Rotary cam type press apparatus 2 Lower mold | type 3 Rotary cam 3a End surface 3b Processing surface 3c Pressed surface 4 Punch 5 Air cylinder (rotation drive part)
6 Supporting member 7 Slide member 7a Front end side 7b Rear end side 8 Stopper member (impact buffer member)
9 Slide plate 10 Top hanging cam 10a Processing blade 30 Negative angle forming part W Work W1 Work edge

Claims (4)

A rotary cam type press device that presses the upper suspension cam against a negative angle forming die via a work and performs negative angle forming of the work,
A lower mold for holding the workpiece;
A rotary cam that is rotatably provided on the lower mold and has the negative angle mold;
A slide plate rotatably supported in a seesaw shape in the lower mold and capable of pressing the rotary cam by a front end side;
The upper suspension cam is provided to be capable of moving forward along the slide plate,
When the upper suspension cam advances along the slide plate, the front end side of the slide plate presses the rotary cam, and the upper suspension cam is brought into a state capable of being pressed against the negative angle forming die,
When the upper suspension cam moves backward, the pressing state of the slide plate against the rotary cam is released, and the rotary cam can be rotated in a direction in which the negative angle forming die is pulled away from the workpiece. Cam press machine.   2. The rotary cam type press device according to claim 1, wherein in the slide plate pivotally supported in the seesaw shape, a fulcrum on which the slide plate rotates is provided on a front end side. A rotation drive unit that applies a rotational force to the rotary cam in a direction in which the negative angle mold is separated from the workpiece;
2. The pressing force to the rotary cam of the slide plate generated by the upper suspension cam moving forward along the slide plate is larger than the rotational force of the rotation drive unit. 2. The rotary cam type press device described in 2.   4. The shock absorbing member that is slidable by the upper suspension cam when the upper suspension cam advances along the slide plate is provided on the lower mold. The rotary cam type press apparatus described in any one.

Images