JPH0349839Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a bolster device disposed at a lower position of a press machine in opposing relation to a slide.

BACKGROUND TECHNOLOGY In general, a press machine has a bolster device fixed at a lower position and a slide provided above the bolster device so as to be movable up and down, and a mold is attached to each of the bolster device and the slide. The work piece carried between the two molds is punched out by the vertical movement of the slide. In addition, the above-mentioned transport of the workpiece between the two molds and the transport of the processed workpiece are automatically carried out by a feeding device, so that the workpiece is transported to a predetermined position between the two molds. When the workpiece is positioned, a pilot pin attached to the mold on the slide side is inserted into a pin hole drilled in the workpiece and the mold on the bolster device side to position the workpiece. .

Problems that the invention aims to solve: The above-mentioned type of press machine has feed errors such as not feeding the work piece to the appropriate length, and scraps left behind when cut pieces from punching adhere to the mold on the slide side. may occur. If the feed error occurs, the pilot pin will not be inserted into the pin hole drilled in the workpiece, and there is a risk that the workpiece or the pilot pin will be damaged and its fragments will be left between the two molds. Also, if the above residue remains,
During the next punching operation, burrs are likely to occur on the cut surface of the workpiece, and if burrs occur, the workpiece that has been punched once will not separate from the mold, and the same workpiece will be punched multiple times. There is a risk of it being stored away.

If the above-mentioned feed errors, scrap residue, etc. occur and the punching operation is repeated with foreign objects such as fragments of the pilot pin or workpieces that did not separate from the molds existing between the two molds, defective products will occur. In addition, there were problems such as damage to expensive molds. In other words, since the vertical stroke of the press slide is always constant, if a punching operation is performed with a foreign object between the two dies, an abnormally large force will be applied between the two dies, causing damage to the dies. There is a risk of damage occurring.

Means for Solving the Problems The bolster device of the present invention includes a bolster housing fixed within the frame of a press machine, and a boss router installed in the bolster housing so as to be movable in the vertical direction, the bolster housing being , has a stopper that determines the upper end position of the bolster, and the bolster is urged upwardly by a spring to the upper end position where it engages with the stopper, and the urging force of the spring is It is characterized by being set to a predetermined value that is greater than the downward pressing force applied to the bolster during normal operation of the press machine, and by having such a characteristic configuration, the above-mentioned problems can be solved. Solve.

Function In the present invention, the bolster is urged upward by a predetermined force that is greater than the downward pressing force applied to the bolster during normal operation of the press, and is pressed to the upper end position where it engages with the stopper. . Therefore, the bolster will only move downward when an abnormal downward force is applied to the bolster that exceeds the predetermined force. Therefore, when the press operates abnormally, such as when there is a foreign object between the mold attached to the bolster and the mold attached to the slide, the force applied between the two molds, that is, the slide moves downward. When the downward pressing force applied to the bolster by the dies reaches a predetermined value or more, the bolster moves downward to prevent the force from exceeding a predetermined value from being applied to both molds, thereby preventing the metal from being applied. Prevent damage to the mold.

Embodiment FIG. 4 shows a press machine incorporating a bolster device 1 according to an embodiment of the present invention. That is, the bolster device 1 is disposed below the frame 50 of the press machine, and the slide 13 is provided above it. The slide 13 moves in the vertical direction A when the crankshaft 51 and flywheel 52 are rotationally driven.
They are starting to move to. Also slide 13
Molds 53 and 54 are attached to each of the and bolster device 1 so as to face each other, and the workpiece W carried between the two molds is punched out when the slide 13 is moved downward. It's summery.

1 to 3 show the detailed structure of the bolster device 1. As shown in FIG. That is, this bolster device 1
The bolster housing 4 is fixed within the frame 50 of the press machine, and the bolster housing 4 is fixed to the press frame 50.
It is equipped with a bolster 3 that is mounted so as to be movable in the vertical direction. The bolster 3 has a main body 3a and a bolster plate 3b bolted to the top of the main body 3a, and a mold 54 (FIG. 4) is fixed onto the bolster plate 3b. Further, an inward protrusion 4 provided at approximately the center of the bolster housing 4 in the height direction.
a and an outwardly protruding portion 3c provided above the main body portion 3a of the bolster.
A plurality of springs 7 are provided to constantly bias the spring upward.

A press plate 8 is bolted 2 to the top of the bolster housing 4. The presser plate 8 also covers the top of the outwardly projecting portion 3c of the bolster.
A pressure adjustment bolt 5 is screwed into the press plate 8 so as to pass through the outward protrusion 3c. That is, this pressure adjustment bolt 5 has a spring presser 6 at its lower end that engages with the top of the spring 7, and by rotating this bolt 5, the spring force of the spring 7 is adjusted. ing. Note that the pressure adjustment bolt 5 is screwed onto the outward protrusion 3c.
For example, when the bolster 3 moves downward from the position shown in FIG. Note that the bolster 3 is normally urged upward by a spring 7 and pressed to an upper end position where it engages with the presser plate 8. Therefore, the pressing plate 8 also serves as a stopper provided on the bolster housing 4 to determine the upper end position of the bolster 3.

The inner surface 8a of the presser plate 8 serves as a guide surface for vertical movement of the bolster 3. Moreover, since the bottom end of the bolster housing 4 and the bottom end of the bolster 3 are connected by the elastic diaphragm 9, when the bolster 3 moves up and down, the bottom end of the bolster moves left and right (see FIGS. 1 and 3). 3), and the up and down movement of the bolster 3 is performed well. Incidentally, a shock-absorbing filler 10 made of foamed polystyrene, urethane, or the like is sealed in the gap between the bolster 3 and the bolster housing 4. Further, numeral 20 in the figure indicates a T-shaped slot provided in the bolster plate 3b for fixing the mold.

The bolster device of the illustrated embodiment has the above-described configuration, and when used, the spring 7
The urging force that urges the bolster 3 upward prevents the bolster 3 from moving downward during normal operation of the press, while a downward pressing force of more than a predetermined value is applied to the bolster 3 when the press operates abnormally. Adjusted to allow downward movement of the bolster when pushed. That is, the force Fi applied to the bolster 3 when the slide 13 (Fig. 4) is lowered to punch out a workpiece during normal operation of the press machine.
Then, apply pressure so that the spring force Fs of each spring 7 and the number n of springs 7 have the relationship Fi = n・Fs, or the value on the right side of the above equation is somewhat larger than that on the left side. The spring force of the spring 7 is adjusted by the adjustment bolt 5. (Although the bolster 3 moves downward against the spring force of the spring 7 and the elastic force of the elastic diaphragm 9, the elastic force of the elastic diaphragm 9 is minute compared to the spring force of the spring 7, (This can be ignored.) If this is done, the slide 13 will not move downward during normal operation of the press.
The workpiece can be punched out successfully by lowering. In addition, when the downward pressing force applied to the bolster due to the feed error of the work piece or the residue of scraps as mentioned above reaches a predetermined abnormal value, the bolster moves downward, so that the mold is pressed against the mold by a predetermined value or more. No pressure is applied.

In the illustrated embodiment, a touch sensor 11 is provided on the side surface of the holding plate 8. If this touch sensor 11 is provided, as described above, when the bolster 3 moves downward, the touch sensor 11 senses the movement and stops the drive of the press, thereby minimizing the production of defective products. At the same time, it is possible to prevent damage to the feeding device for carrying the work piece into and out of the press machine.

Effects of the Invention As is clear from the above, the bolster device of the present invention is effective in preventing damage to the mold by preventing a pressurizing force exceeding a predetermined value from being applied to the mold during abnormal operation of the press machine. be.

[Brief explanation of the drawing]

1 is a vertical sectional view showing a bolster device according to an embodiment of the present invention, FIG. 2 is a top view of FIG. 1, FIG. 3 is a partially sectional side view of FIG. FIG. 4 is a schematic front view showing the bolster device installed in a press machine. 1... Bolster device, 3... Bolster, 4
... Bolster housing, 5 ... Pressure adjustment bolt, 7 ... Spring, 13 ... Slide, 50
……flame.

Claims (1)

[Scope of utility model registration request] The press includes a bolster housing fixed within the frame of the press machine, and a bolster mounted in the bolster housing so as to be movable up and down. The bolster housing has a stopper that determines the upper end position of the bolster, and the bolster It is urged upward by a spring to the upper end position where it engages with the stopper, and the urging force of the spring is greater than the downward pressing force applied to the bolster during normal operation of the press machine. A bolster device characterized by being set to a predetermined value.