JP2020006427A - Press mold for processing motor vehicle body component and workpiece pressing pin unit - Google Patents

Abstract

To inhibit occurrence of scratches on a pressing pin contact surface of a workpiece W and improve the quality of press work.SOLUTION: A workpiece pressing pin unit 10 for pressing and fixing a workpiece W is attached to an upper mold 1. The workpiece pressing pin unit 10 includes: a pressing pin 11; a coil spring unit 12 which is connected to the pressing pin 11 and biases the pressing pin downward; and a spring case 13 which houses the coil spring unit 12. The coil spring unit 12 includes: a first coil spring 12a; and a second coil spring 12b which is serially connected to the first coil spring 12a and wound in an opposite direction of the first coil spring 12a.SELECTED DRAWING: Figure 1

Description

The present invention relates to a press die and a work holding pin unit.

  2. Description of the Related Art Conventionally, there has been known a press die having a holding pin for fixing a work prior to press working. Patent Literature 1 discloses a holding pin that is vertically movably mounted in a through hole provided in an upper die, a holding pin connected to a tip end thereof, and a coil spring that urges the holding pin, and contains the coil spring. And a press die having a spring case.

JP 2000-79419 A

  However, when the tip of the holding pin abuts on the work and is fixed, the coil spring contracts, and a rotational force is applied to the tip of the coil spring. Then, the holding pin connected to the tip of the coil spring rotates, and there is a problem that the holding pin contact surface of the work is scratched like a gore.

  In view of the above-mentioned problems, a press die of the present invention includes an upper die having a work pressing pin unit for pressing a work, and a lower die disposed to face the upper die, and wherein the work pressing pin is provided. The unit includes a holding pin, a coil spring unit for urging the holding pin downward, and a spring case for housing the coil spring unit. The coil spring unit includes a first coil spring, and a first coil. A second coil spring connected in series with the spring and wound in a direction opposite to the first coil spring.

  Further, the work holding pin unit of the present invention is a work holding pin unit that is mounted on an upper die of a press die and holds a work placed on a lower die. A spring unit for storing the coil spring unit, wherein the coil spring unit is connected in series with the first coil spring, and the first coil spring is connected to the first coil spring. And a second coil spring wound in the opposite direction.

  According to the present invention, since the coil springs for urging the holding pins are constituted by two series coil springs wound in opposite directions, these coil springs exert opposite rotational forces upon contraction. Is given, the rotation of both is canceled, and the rotation of the holding pin is suppressed. Thus, it is possible to suppress the occurrence of scratches on the pressing pin contact surface of the work and improve the quality of the pressed product.

FIG. 3 is a cross-sectional view of a press die and a work holding pin unit according to the embodiment of the present invention. It is the top view which looked at the work holding pin unit in an embodiment of the present invention from the tip side of a holding pin. It is sectional drawing which shows the press process using the press die in embodiment of this invention. It is sectional drawing which shows the press process using another press die in embodiment of this invention.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a press die and a work holding pin unit according to an embodiment of the present invention. FIG. 1A shows a state in which the tip of the work holding pin is not in contact with a work W (for example, a steel plate). FIG. 1A shows a state in which the upper die 1 moves down, and the tip of the work holding pin abuts on the work W to fix it.

  As shown in the drawing, the press die 100 includes an upper die 1 and a lower die (not shown) arranged to face the upper die 1, and a work W is placed on a press surface of the lower die. ing. The upper die 1 is provided with a work holding pin unit 10 for holding and fixing the work W. The upper die 1 is configured to be able to move up and down by a drive unit (not shown).

  The work holding pin unit 10 is inserted into the through hole 1a of the upper die 1, and holds the holding pin 11, a coil spring unit 12 connected to the holding pin 11 and biasing the same downward, and a coil spring unit. A spring case 13 is provided for housing the spring case 12.

  The coil spring unit 12 includes a first coil spring 12a and a second coil spring 12b connected in series with the first coil spring 12a and wound in a direction opposite to the direction of the first coil spring 12a. Prepare. For example, if the first coil spring 12a is right-handed, the second coil spring 12b is left-handed.

  As shown in FIG. 1B, when the upper die 1 moves down and the tip of the holding pin 11 contacts and presses the work W, the holding pin 11 resists the repulsive force of the coil spring unit 12. When pushed into the spring case 13, the coil spring unit 12 contracts.

  At this time, the first and second coil springs 12a and 12b are provided with rotational forces in opposite directions, and the rotations of both are canceled out, so that the rotation of the holding pin 11 is suppressed. Thereby, it is possible to suppress the occurrence of scratches on the pressing pin contact surface of the work W and improve the quality of the pressed product. In particular, in the case where the pressed product is an automobile body part, high quality is required in appearance in recent years.

  In order to offset the rotational force of the first and second coil springs 12a, 12b, the first and second coil springs 12a, 12b have the same outer diameter, length, number of turns, and have the same spring constant. Is preferred.

  As shown in FIGS. 1 and 2, the spring case 13 is formed of a bottomed cylindrical body, and its upper end is closed by a disc-shaped bottom plate 13a, and its lower end is inserted through the holding pin 11. The hole 13b is open. The holding pin 11 has an elongated cylindrical pin body 11a and a cylindrical pin head 11b connected to the upper end of the pin body 11a.

  The outer diameter of the pin head 11b is larger than the outer diameter of the pin body 11a and the diameter of the insertion hole 13b. As a result, the pin head 11b is locked at the lower end of the spring case 13, and the lowermost point of the holding pin 11 in the spring case 13 is positioned.

  Further, a partition plate 14 is provided which can move the first and second coil springs 12a and 12b in the vertical direction along the inner wall of the spring case 13. One end of the first coil spring 12a is connected to the upper surface of the partition plate 14, and the other end is connected to the bottom plate 13a. One end of the second coil spring 12b is connected to the lower surface of the partition plate 14, and the other end is connected to the pin head 11b of the holding pin 11.

  It is preferable that the partition plate 14 has a disk shape and the side surface thereof slides on the inner wall surface of the spring case 13 in order to provide a function of guiding the coil spring unit 12.

  By providing such a partition plate 14, the first and second coil springs 12a and 12b can be connected stably, and both springs can be guided along the inner wall of the spring case 13 so that both springs can be connected. Can be expanded and contracted in the vertical direction while suppressing the rotation of.

  Next, a press process using the press die 100 will be described with reference to FIG. First, as shown in FIG. 3A, the work W is placed on the press surface of the lower die 2. The lower die 2 has a concave portion, and the upper die 1 has a convex portion (punch) fitted into the concave portion of the lower die.

  The pair of work holding pin units 10 and 10 are mounted in an area adjacent to the convex portion of the upper die 1. In this state, the upper die 1 is above the lower die 2, and the pressing pins 11 of the pair of work pressing pin units 10, 10 project downward from the upper die 1 by the urging force of the coil spring unit 12. However, it has not yet contacted the work W.

  Next, as shown in FIG. 3B, when the upper die 1 moves down, the tips of the holding pins 11, 11 (tips of the pin body 11a) abut on the surface of the work W to fix the work W. . In this state, the upper mold 1 is not in contact with the workpiece W.

  Next, as shown in FIG. 3C, when the upper mold 1 moves further downward, the work W is pressed between the upper mold 1 and the lower mold 2 so as to be pressed. In the course of the press working, the holding pins 11, 11 of the pair of work holding pin units 10, 10 are pushed into the spring case 13 against the repulsive force of the coil spring unit 12, and the coil spring unit 12 contracts. .

  At this time, as described above, the first and second coil springs 12a and 12b are provided with rotational forces opposite to each other, and the rotations of both are canceled out. As a result, the rotation of the holding pins 11 and 11 is suppressed. Thereby, it is possible to suppress the occurrence of scratches on the pressing pin contact surface of the work W and improve the quality of the pressed product.

  When the upper die 1 reaches the bottom dead center, the holding pins 11, 11 of the pair of work holding pin units 10, 10 are completely pushed into the spring case 13, and the tips thereof are in contact with the press surface of the upper die 1. It is flush.

  Thus, when the press working is completed, the upper die 1 starts moving upward. Then, the holding pins 11, 11 of the pair of work holding pin units 10, 10 project from the spring case 13 by the urging force of the coil spring unit 12, and return to the state of FIG.

  Next, a press process using another press die 100A will be described with reference to FIG. In the press die 100A, the lower die 2A has a convex portion, and the upper die 1A has a concave portion (punch) fitted to the lower die convex portion. The pair of work holding pin units 10, 10 are mounted on the upper die 1A. The pressing process is the same as the pressing process in FIG.

  In the above-described embodiment, the coil spring unit 12 connects two coil springs having opposite windings in series. However, the present invention is not limited to this, and one or more coil springs having opposite windings may be included. For example, three or more coil springs may be connected in series. For example, a configuration in which four coil springs are connected in series and coil springs of reverse winding are alternately arranged.

1, 1A Upper die 1a Through hole 2, 2A Lower die 10 Work holding pin unit 11 Holding pin 11a Pin body 11b Pin head 12 Coil spring unit 12a First coil spring 12b Second coil spring 13 Spring case 13a Bottom plate 13b Insertion hole 14 Partition plate

In view of the above-mentioned problems, a press die for processing an automobile body part of the present invention includes an upper die having a work holding pin unit for holding a work, and a lower die arranged to face the upper die, The work holding pin unit includes a holding pin, a coil spring unit that urges the holding pin downward, and a spring case that houses the coil spring unit. The coil spring unit includes a first coil spring and a first coil spring. A second coil spring connected in series with the first coil spring and wound in a direction opposite to that of the first coil spring.

The work holding pin unit of the present invention is a work holding pin unit that is mounted on an upper die of a press die for processing an automobile body part and holds a work placed on a lower die. A coil spring unit for biasing the coil spring unit, and a spring case for accommodating the coil spring unit. The coil spring unit is connected in series with a first coil spring and the first coil spring. And a second coil spring wound in the opposite direction to the coil spring.

Claims (4)

An upper die having a work holding pin unit for holding a work,
A lower mold disposed opposite to the upper mold,
The work holding pin unit includes a holding pin, a coil spring unit that biases the holding pin downward, and a spring case that houses the coil spring unit.
The coil spring unit includes a first coil spring, and a second coil spring connected in series with the first coil spring and wound in a direction opposite to the first coil spring. And press mold. A partition plate capable of vertically guiding the coil spring unit along the inner wall of the spring case,
The press die according to claim 1, wherein one end of the first coil spring is connected to an upper surface of the partition plate, and one end of the second coil spring is connected to a lower surface of the partition plate. In the work holding pin unit that is mounted on the upper die of the press die and holds the work placed on the lower die,
Holding pin
A coil spring unit for urging the holding pin downward,
A spring case for housing the coil spring unit,
The coil spring unit includes a first coil spring, and a second coil spring connected in series with the first coil spring and wound in a direction opposite to the first coil spring. Work holding pin unit. A partition plate capable of vertically guiding the coil spring unit along the inner wall of the spring case,
4. The work holding pin unit according to claim 3, wherein one end of the first coil spring is connected to an upper surface of the partition plate, and one end of the second coil spring is connected to a lower surface of the partition plate. .

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