JPS6013599Y2 - Dictionary breakage prevention device in press machines - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for preventing damage to a Gui Cushion in a press machine, and more specifically, a detection device for detecting overstroke of a piston rod of a cylinder in the Gui Cushion device is provided. This invention relates to a device for preventing damage to a cushion in a press machine, which is provided with a device to discharge air in the cylinder when the device is operated.

In general, it has been known to install a Gui cushion device when performing embossment molding with a single-action press, and in this case, the length of the pressure pin is changed depending on the depth of the embossment on the molded product. It is used as

By the way, with such a conventional Gui cushion device, if the length of the pressure pin is incorrect and a press operation that exceeds the stroke of the Gui cushion device is performed, the Gui cushion device may be damaged or the mold may be damaged. There was a problem.

This invention was devised in view of such conventional problems and to effectively solve them, and its purpose is to detect the overstroke of the piston rod of the cylinder in the Gui Cushion device. A detection device is provided so that the air in the cylinder is discharged when the detection device is activated, and even if the length of the pressure pin is incorrect and the pressing operation is performed beyond the stroke of the Gui Cushion device, To provide a Goo cushion damage prevention device that can prevent damage to the Goo cushion device or a mold.

Hereinafter, a preferred embodiment of this invention will be described in detail with reference to the drawings.

FIG. 1 shows a side view of a single-action press 1,
The single-acting press 1 consists of a C-shaped frame 5 with a bottom part 3, and a slide 9 for assembling the upper die 7 (Gui).
and a bolster 13 for assembling the lower mold 11 (punch),
Gui cushion device 15 is attached.

The slide 9 is vertically slidably supported by an upper frame 17 located above the bosom portion 3 of the C-shaped frame 5, and a die is detachably assembled to a die holder 19 attached to the lower end of the slide 9. .

The bolster 13 is attached to the chest portion 3 of the C-shaped frame 5.
The punch 11 is detachably assembled to a punch holder 23 that is provided on a lower frame 21 located below the punch holder 23 and mounted on the bolster 13.

The cushion device 15 is provided in the lower frame 21 located below the bolster 13 and supports the lower end of the pressure pin 25.

The pressure pin 25 is vertically slidably inserted into the through holes 27 and 29 of the bolster 13 and the punch holder 23, a pressure ring 31 is supported at the upper end of the pressure pin 25, and a lower end is supported by the guide cushion device. 15.

The length of the pressure pin 25 is set in accordance with the depth of the embossment on the molded product.

FIG. 2 shows a front sectional view of the Gui cushion device 15, and the Gui cushion device 15 is attached to a bracket 33 of the lower frame 21 of the single acting press 1 via a cylinder cap 35 with a fastener such as a bolt. A cylinder 39 is fixed by a cylinder 37, and a cylinder piston 41 is vertically slidable and airtightly mounted along the outer peripheral surface of the cylinder 39.

The cylinder piston 41 has a rotation stopper key 43 provided at its lower end slidably engaged with a key groove 45 bored in the axial direction on the outer peripheral surface of the cylinder 39.
The cylinder 39 is prevented from rotating in the circumferential direction, and is mounted so as to be slidable in the vertical direction.

The cylinder piston 41 has a wear plate 4 on the outer side of its upper end that comes into contact with the pressure pin 25.
A gou cushion pad 49 having a diameter of 7 is fixed by a fastener 51 such as a bolt, and a piston rod 53 is fixed at the inner center portion by a fastener 55 such as a bolt.

The wear plate 47 prevents the cushion pad 49 from being worn out by the pressure pin 25 during pressurization.

The piston rod 53 is inserted into an insertion hole 6 provided in the center of a partition wall 61 that is fixed to the upper end of the sensor 39 via a flange portion 57 with a fastener 59 such as a bolt.
3 and is slidable up and down and airtightly fitted.

The partition wall 61 defines a first cylinder chamber 65 and a second cylinder chamber 6 within the cylinder 39 and the cylinder piston 41.
It is divided into 7.

A piston 69 is attached to the lower end of the piston rod 53, which extends into the first cylinder chamber 65, by a tightening nut 71 and is slidable up and down along the inner circumferential surface of the cylinder 39 and is provided in an airtight manner. .

Note that the space formed between the partition wall 61 and the piston 69 is appropriately communicated with the outside.

Further, a communication hole 73 is formed in the piston rod 53 along its axis, and the upper end of the communication hole 73 communicates with the second cylinder chamber 67 via a through hole 75 formed in the circumferential direction. At the same time, the end thereof opens into the first cylinder chamber 65, and the first cylinder chamber 65 and the second cylinder chamber 6 are connected to each other.
7 are connected.

A piston rod 53 is attached to the cylinder cap 35.
A penetrating pin hole 77 is provided at a position corresponding to the lower end of the , and a safety pin 79 that constitutes a part of a kind of detection device is removably fitted into this pin hole 77.
A plurality of locking holes 81 are drilled at appropriate positions on the outer peripheral surface.
Then, a steel ball 85 supported via a spring 83 such as a spring is attached to the cylinder cap 3.
They are respectively engaged with ball grooves 87 provided on the inner circumferential surface of the pin holes 77 of No. 5, and are detachably and airtightly held in the cylinder cap 35.

Further, the safety pin 79 is formed with a small diameter portion 89 having a smaller diameter than the diameter of the pin hole 77 near the upper end thereof;
When the safety pin 79 descends and leaves the pin hole 77 of the cylinder cap 35, the air in the first cylinder chamber 65 is configured to escape to the outside.

Further, the safety pin 79 is provided with a flange portion 91 at its lower end, and a stopper pin 95 provided on the cylinder cap 35 is loosely fitted into a plurality of through holes 93 provided on the flange portion 91. When the safety pin 79 is removed from the pin hole 77 of the cylinder cap 35, the safety pin 79 is prevented from falling.

An inner step hole portion 97 and an outer step hole portion 99 each having a diameter larger than the diameter of the bottle hole 77 are bored at the inner and outer ends of the bottle hole 77 of the cylinder cap 35. Reference numeral 97 corresponds to the tightening nut 71 of the piston 69, and a tapered collar 101 opening downward is attached to the outer step hole 99.

Further, a limit switch 105 is attached to the outer surface of the cylinder cap 35 via a bracket 103, and the limit switch 105 is engaged with the peripheral edge of the flange portion 91 of the safety pin 79.
A bolt insertion hole 107 formed in the flange portion 91 of the safety pin 79 is configured to detect the descent of the safety pin 79.
A screw hole 109 for reassembly is screwed in a position corresponding to .

Further, the cylinder cap 35 is provided with an air supply port 111 that communicates with an air supply source (not shown).

The upper end of the safety pin 79 has a sufficiently small pressure-receiving area and is held on the cylinder cap 35 with a holding force sufficient to withstand the air pressure inside the first cylinder chamber 65.

In the above configuration, when air is supplied from an air supply source (not shown) through the air supply port 111, the Guicushion device 15 supplies air to the first cylinder chamber 65.
The air that has flowed into the first cylinder chamber 65 flows into the second cylinder chamber 67 from the communication hole 73 of the piston rod 53 through the through hole 75.

Therefore, the air pressure acts on the piston 69 in the first cylinder chamber 65 and the cylinder piston 41 in the second cylinder chamber 67.
are raised integrally, and the Gui cushion pad 49 is located at the top dead center.

When the pressing operation is started with the goo cushion device 15 in the above-described state, the slide 9 descends and the periphery of the blank is pressed by the diamond and the pressure ring 31 to apply wrinkles.

Furthermore, as the slide 9 descends, the blank is shaped by the punch 11.

At this time, the cylinder piston 41 and the piston 69 are lowered together with the pressure ring 31 and the pressure pin 25 via the cushion pad 49.

At this time, the first cylinder chamber 65 and the second cylinder chamber 6
The air in 7 is compressed.

Then, when the slide 9 descends to the bottom dead center and the crest forming is completed, the slide 9 begins to rise.

When the slide 9 starts to rise, the Gui cushion device 1
The cylinder piston 41 and piston 69 of No. 5 are also lifted together by the pressure of the compressed air and returned to their original positions.

Therefore, the pressure ring 31 also has the pressure pin 2.
5 and is returned to its original position.

The pressure pin 25 in the crest forming operation of the single acting press 1 performed as described above is set within the range of the stroke A of the cylinder piston 41 and piston 49 of the gou cushion device 15.

Now, if the pressure pin 25 of the Gui cushion device 15 with stroke A or more is used to perform the crest forming work, the lower end of the piston rod 53 will come into contact with the top end surface of the safety pin 79, and the corresponding Push down the safety pin 79 and insert it into the ball hole 8 of the bottle hole 77 of the cylinder cap 35.
Steel ball 85 of safety pin 79 that was locked in 7
is removed from the ball groove 87, and the safety pin 79 falls downward and is supported by the stopper pin 95 (see FIG. 3).

As a result, the compressed air in the first cylinder chamber 65 and the second cylinder chamber 67 is transferred to the cylinder cap 3.
The Gui cushion device 15 is mechanically released from the gap B created between the bottle hole 77 and the safety pin 79 of the Gui cushion device 15.
limit switch 10 is prevented from restarting.
5 detaches from the flange portion 91 of the safety pin 79, and the single-acting press 1 is electrically switched off by the signal from the limit switch 105.
will be stopped.

In addition, when reassembling the Gui cushion device 15 and performing the press operation again, the flange portion 91 of the safety pin 79
By inserting a bolt into the bolt insertion hole 107 provided in the cylinder cap 35, and screwing it into the reassembly screw hole 109 provided in the cylinder cap 35, the safety pin 79 is pushed up and inserted into the bottle hole 77 of the cylinder cap 35. engage.

At this time, the steel ball 8 held by the safety pin 79
5 is smoothly engaged with the ball groove 87 of the bottle hole 77 along the taper of the taper collar 101, and the safety pin 7
9 is held in the pin hole 77 of the cylinder cap 35.

Also, at this time, the limit switch 105 engages with the flange portion 91 of the safety pin 79.

Through the above operations, the Gui cushion device 15 can be restarted, and the single acting press 1 can therefore be restarted.

As can be understood from the above description of the embodiments, the gist of the present invention is as stated in the claims for utility model registration. Even if you perform a press operation with an overstroke that exceeds the stroke of Therefore, it is possible to prevent damage to the Gui Cushion device or the mold.

Note that the detection device for detecting the overstroke of the piston rod in the first embodiment described above and the device for discharging the air in the cylinder when the detection device is activated may be configured as follows. .

That is, as a second embodiment, a limit switch is provided to detect the overstroke of the piston rod, and a solenoid valve is provided in the air supply source.
A limit switch detects when the piston rod overstrokes, and a signal from the limit switch causes the single-acting press to stop, and the solenoid valve is activated to open the valve and discharge the air in the cylinder to the outside. Accordingly, the same effects as in the first embodiment can be obtained.

In addition, as a third embodiment, a bushing rod, which forms the safety pin in the first embodiment, is provided at a position corresponding to the piston rod, and this bushing rod is connected to an air supply path provided in an air supply path that communicates the air supply source with the Gui cushion device. It is connected to the switching valve and also to the limit switch, and when the piston rod overstrokes, the bushing rod is pushed down by the piston rod.
When the bushing rod is lowered, a limit switch is activated, and a signal from the limit switch causes the single-acting press to stop, and the air switching valve is opened to discharge air from the cylinder to the outside. The same effect as in the example can be obtained.

Furthermore, this invention is not limited to the above-mentioned embodiments, and the invention can be implemented in modes other than the above-mentioned embodiments.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, in which Fig. 1 is a side view of a single-action press equipped with a Gui Cushion breakage prevention device according to this invention, Fig. 2 is a front cross-sectional explanatory view of the main parts, FIG. 3 is an explanatory diagram of the operation of the main parts. Explanation of the symbols representing the main parts of the drawing, 15...
・Gui cushion device, 39... cylinder・
53... Zeston rod, 79... Safety hint.

Claims (1)

[Scope of utility model registration request] A cylinder 39 attached to the lower frame 21 of the press machine is provided with a piston supporting a Gui cushion pad 49 on the upper part so as to be movable up and down, and a pin hole 77 is formed in the cylinder cap 35 provided at the lower part of the cylinder 39. The upper end of a safety pin 79, which is detachably and airtightly held in the pin hole 77, is provided so as to protrude into the cylinder 39 so as to be able to come into contact with the piston, and is formed to have a smaller diameter than the pin hole 77. A device for preventing jerky damage in a press machine, which is characterized by: