JPS61279321A - Method for conveying work in plastic working machine - Google Patents

Abstract

PURPOSE:To reduce the time for carrying away the work after working by raising slightly the work from a lower die and holding the work for a specified period during the ascending of an upper die and carrying the work by means of a handling arm during this time then raising a blank holder. CONSTITUTION:The work W is imposed to the blank holder provided in an upper limit position and the work W grasped between the upper die 2 and the blank holder 7 is lowered. The work W is plastically worked by the cooperation of the lower die 1 and the upper die 2. The rise of the blank holder 7 is temporarily stopped and the work W is slightly raised from the blank holder 7 and the lower die 1 by a spring 14 during the ascending of the upper die 2 after working. A conveying means 3 operates during this time and the blank holder 7 moves onto the work W to carry the work W toward the side during this time. The blank holder 7 ascends thereafter up to the upper limit position. The time for carrying away the work which is completed of working is thus reduced.

Description

Detailed Description of the Invention A0 Object of the Invention (1) Industrial Application Field The present invention is directed to placing a workpiece on a blank holder at the upper limit position at the start of plastic working, and moving the workpiece upward as the upper die descends. A handling arm that can hold the workpiece between the mold and the blank holder, lower the workpiece, work together with the lower mold and upper mold to raise the upper mold after plastic working the workpiece, and hold the workpiece between the lower mold and the upper mold. The present invention relates to a method for transporting a workpiece in a plastic processing machine, in which the workpiece is transported by inserting the workpiece.

(2) Conventional technology Conventionally, in such plastic processing machines, the blank holder responds to the operation of the upper die, and as the upper die rises after plastic processing of the workpiece, the blank holder is raised to the upper limit position. , the workpiece is being carried out.

(3) Problems to be solved by the invention However, until the blank holder rises to the upper limit position,
Since the handling arm must be kept on standby in order to carry out the workpiece, the time required to carry out the workpiece after plastic working is relatively long.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for transporting a workpiece in a plastic processing machine, which allows the workpiece to be quickly transported after plastic processing by the lower mold and the upper mold. .

B1 Structure of the Invention TlJ Means for Solving Problems According to the method of the present invention, when the upper die is raised, the workpiece is slightly raised from the lower die and held for a certain period of time, during which time the workpiece is carried out by the handling arm. After that, the blank holder was raised to the upper limit position.

(2) Operation The rework is carried out by the handling arm while the upper die is rising, and then the blank holder is quickly raised to the upper limit position, so the work is promptly carried out.

(3) Example Below, an example of the present invention will be explained with reference to the drawings. First, in FIG. It is for drawing and forming, and a conveying means 3 is attached.

The lower mold 1 is fixed on a bolster 5 fixedly disposed with a space between it and the floor surface 4. On the other hand, the upper die 2 is arranged above the lower die l and is fixed to the lower surface of the ram 6 which is driven up and down by a drive means (not shown).

A blank holder 7 that can be moved up and down is arranged around the lower mold 1. This blank holder 7 is supported by the upper ends of a plurality of support pins 8 that vertically pass through the lower mold 1 and the bolster 5, and the lower ends of these support pins 8 are attached to the support plate 9 below the bolster 5. connected in common. On the other hand, a cylinder 10 having an axis extending vertically is fixedly disposed on the floor surface 4 at a lower part corresponding to the center part of the support plate 9, and an upper end of a piston rod 11 extending upward from the cylinder 10. is fixed to the support plate 9. Therefore, the blank holder 7 moves up and down in response to the expansion and contraction of the cylinder 10.

A positioning plate 12 for positioning and placing a flat workpiece W is fixed to the upper outer edge of the blank holder 7 . Further, a plurality of holes 13 extending vertically are bored in the upper surface of the blank holder 7, and coiled springs 14 are housed in each of the holes 13. Moreover, each spring 14 is
It has a support part 15 at its upper end for supporting the workpiece W, and exerts enough spring force to float the workpiece W from above the blank holder 7 when no force is applied to the workpiece W from above. .

The conveyance means 3 includes, for example, a pair of handling arms 17 provided between a pair of transfer pars 16 arranged in parallel to each other on both sides of the lower mold 1 and the upper mold 2. In such a transfer means 3, both transfer pars 16 move in a vertical plane, so that the handling arm 1
As shown by the arrow 18, the workpiece W can be moved from a position to the side of the lower mold 1 to a position above the lower mold 1, hold the workpiece W, and further carry it out to the side of the lower mold 1. It is possible.

Next, to explain the operation of this embodiment, when drawing a flat workpiece W, the workpiece W is brought between the upper mold 2 and the lower mold 1 by the conveying means 3 while the upper mold 2 is raised. , and position and place it on the blank holder 7. At this time 1, the blank holder 7 is at the upper limit position,
The workpiece W is supported by a spring 14 in a floating state above the blank holder 7.

Next, the upper die 2 descends, and as the upper die 2 contacts the workpiece W and presses it downward, the spring 14 contracts, and the workpiece W is held between the upper die 2 and the bran holder duff. As the upper die 2 further descends, the blank holder 7 also descends, and as shown in FIG.
The drawing process of the workpiece W is performed.

Thereafter, the upper die 2 rises, but the rise of the blank holder 7 is temporarily stopped. Therefore, when the pressing force from above on the workpiece W is released as the upper die 2 rises, the third
As shown in the figure, the spring 14 is expanded, and the workpiece W floats above the blank holder 7 and is also slightly raised above the lower mold 1.

At this time, the conveying means 3 is activated and the handling arm 1
7 moves onto the workpiece W, holds the workpiece W, and then carries it out to the side.

During this time, the upper mold 2 continues to rise, and after the workpiece W is completely unloaded, the cylinder 10 is extended.
The blank holder 7 quickly rises to its upper limit position,
Prepare for the next drawing process.

In this way, instead of waiting for the blank holder 7 to rise to the upper limit position, the workpiece W is carried out while the upper mold 2 is rising, and then the blank holder 7 is raised to the upper limit position, so that the lower mold 1 Also, the time required to take out the workpiece W after plastic working by the upper die 2 is shortened.

In the above embodiment, the blank holder 7 is provided with the spring 14, but a hydraulically operated bottle may be provided in the blank holder 7 to push up the workpiece W. Alternatively, without providing the spring 14, a bottle, etc. on the blank holder 7, the lifting of the blank holder 7 is temporarily stopped when the workpiece W is slightly lifted from the lower mold 1, and after the workpiece W is carried out, the blank holder 7 is It may also be controlled to restart the rise.

C1 Effects of the Invention As described above, according to the method of the present invention, when the upper die is raised,
The workpiece is slightly raised from the lower mold and held for a certain period of time, during which time the workpiece is carried out by the handling arm, and then the blank holder is raised to the upper limit position, reducing the time required to carry out the workpiece after plastic processing. , As a result, the overall processing time is also shortened.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall vertical sectional side view at the start of plastic working, FIG. 2 is a longitudinal sectional side view of the main part during plastic working, and FIG. 3 is a vertical sectional side view of the main part during plastic working. FIG. ■...Lower die, 2...Upper die, 7...Blank holder, 17...Handling arm, W...Work No. 3
Figure 2

Claims (1)

[Claims] At the start of plastic working, the workpiece is placed on the blank holder at the upper limit position, and as the upper die descends, the workpiece is held between the upper die and the blank holder and lowered, and the lower die and upper die work together. In a method for transporting a workpiece in a plastic processing machine, the upper die is raised after the workpiece is plastic-processed, and a handling arm capable of holding the workpiece is inserted between the lower die and the upper die to carry out the workpiece. When the mold rises,
A method for transporting a workpiece in a plastic processing machine, characterized in that the workpiece is slightly raised from the lower die and held for a certain period of time, during which time the workpiece is carried out by a handling arm, and then the blank holder is raised to the upper limit position. .