JPH10296500A - Overload safety device for multi-slide press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out working within overload setting pressure in every working stage by providing an overload safety devices which are composed of a piston which shares insert plate function and oil pressure supply device to the hydraulic chamber of a bolster in which the piston is incorporated in the working stage on the side of the bolster corresponding to plural slides. SOLUTION: The oil pressure supply device are respectively provided on the overload safety devices 33A-33C which are incorporated in the working stages N1-N3 of the bolster 25. The setting pressure of hydraulic pumps 36A-36C which are made so that the overload safety devices 33A-33C are broken with the pressured oil equivalent to the allowable capacity of the working stage is supplied from a conduit 31A which is connected with supply piping 39A-39C on which oil pressure detectors 38A-38C are provided to the hydraulic chamber 25B. When the oil pressure seal in the hydraulic chamber 25B becomes a broken state by overloading and the pressured oil is released between the jaw part of the piston 30 and a hole part 25C, the oil is discharged to an oil tank 35. To return the overload safety devices 33A-33C, the hydraulic pumps 36A-36C are operated by switching selector valves 41A-41C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a plurality of slides driven from a single drive source, and these slides move up and down with an arbitrary phase difference to advance a plurality of forming processes to form a product shape. The present invention relates to a multi-slide press overload safety device to be created.

[0002]

2. Description of the Related Art In a conventional overload safety device for a press machine, a shear plate is used for a load transmitting portion of a slide, and in the case of an overload, a shear plate type in which the shear plate is broken or a slide plate is used. An oil chamber is provided in the load transmission section, and in the case of overload, there is an air hydraulic system that releases pressurized oil, which is given a preload corresponding to the press capacity by the air pressure in the oil chamber, to the air cylinder side. The pneumatic type is often used in terms of the resilience and the like, and usually the same number of slide driving points are provided on the slide. Further, as a conventional technique which enables the load capacity of a slide to be arbitrarily set and adjusted, Japanese Utility Model Application Laid-Open No. 60-121500 is disclosed.
As shown in the figure, an air pump for supplying pressurized oil to the hydraulic chamber is provided, a regulator for overload setting corresponding to the press specification ability to adjust the pneumatic pressure supplied to the air pump, and gold within the overload set pressure. There is a type provided with a regulator for setting a low pressure for adjusting the air pressure according to the required load of the mold.

[0003]

As described above, in the overload safety device for a press machine according to the prior art, regardless of the number of points, even a slide having a plurality of working stages requires only one slide. However, if an overload is applied during press working, the overload safety device provided for each point will operate simultaneously regardless of the load status of each processing stage. Even if the number is the same, or multiple, in the multi-slide press, which forms the product shape by proceeding the molding process independently with the processing stage with a phase difference, an overload safety device is provided corresponding to the number of slides, and each It had to be operated independently for each processing stage. Also, it has been difficult to provide an overload safety device, which requires a large installation space, on a slide in relation to the pitch between adjacent processing stages.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to increase the shape of a product by performing a plurality of forming operations by moving a slide up and down with an arbitrary phase difference without increasing the pitch between adjacent processing stages. An object of the present invention is to provide an overload safety device that can cope with a multi-slide press that is created.

[0005]

In order to solve the above-mentioned problems, the present invention comprises a plurality of slides driven from one drive source and a bed knockout device, wherein the slides have an arbitrary phase difference. In a multi-slide press that moves up and down to advance multiple forming processes to create a product shape, it stands upright on a bed that contacts the lower surface of the bolster,
A guide that penetrates the knockout pin of the bed knockout device into the hole at the center, a hole having a hole that fits with the outer periphery of the guide, and a nut that is screwed into a screw hole provided at the lower part of the bolster; Is slidably fitted into the hydraulic chamber and the insert hole provided above the screw hole of the bolster, and the first hole guided by the outer periphery of the guide and the second hole penetrating the knockout pin. And an overload safety device comprising a piston having an insert plate function and at least one hydraulic supply device for supplying pressurized oil to a hydraulic chamber of a bolster in which the piston is provided. Are provided on each bolster-side processing stage so as to correspond to each of the above.

In addition, the above-mentioned overload safety device for a multi-slide press includes an allowable load load for each processing stage,
Load setting means for setting and storing in advance the pressure oil corresponding to the actual load at the time of press working within this allowable load range;
A detector for detecting the pressure oil, an arithmetic unit for converting the detected value of the detector into a load, and comparing the detected value with a set value, and a conversion value or set value converted by the arithmetic unit And a display unit for displaying each of the processing stages or simultaneously.

[0007]

FIG. 1 to FIG. 5 show a first embodiment of the present invention. 1 and 2 show an overall view of a multi-slide press, FIG. 3 shows a main part configuration diagram of an overload safety device, and FIGS. 4 and 5 show overload safety devices. The control explanatory drawing is shown. 1 and 2, the crown 2 of the multi-slide press 1 is provided with a main motor 3 having a pulley 4 fixed to a shaft, and the power of the main motor 3 is rotatable by a bearing 2A of the crown 2. It is transmitted via a belt 8 to a flywheel 6 provided with a clutch / brake 7 on a supported drive shaft 5.

[0008] The drive gear 5A provided on the drive shaft 5 includes:
On an intermediate shaft 9 fixed to the crown 2, an intermediate gear 11 fixed to a pinion 10 and rotatably provided is meshed. When the drive gear 5A rotates, the intermediate gear 11 and the pinion 10 rotate, mesh with the pinion 10, are rotatably supported by the bearing 2B of the crown 2, and have three eccentric portions 12A each having an arbitrary phase difference. , 12B, and 12C, a main gear 13 fixed to one end of the eccentric shaft 12 rotates. When the main gear 13 rotates, the eccentric shaft 12 rotates,
Via the connecting rods 14A, 14B, 14C,
The slides 15A, 15B, 15C move up and down with respective phase differences.

As shown in FIGS. 1 to 3, a crown 16 is fixed to the other end of the eccentric shaft 11 and a roller 17 which is in contact with the cam 16 is rotatably connected to the crown 2 by a fulcrum O1.
Provided on the upper lever 18 so that the cam 16 is
When rotated in synchronization with 1, the upper lever 18 swings to move the connecting rod 19 up and down, and the lower lever 21 having the bed 20 connected to the rod 19 as a fulcrum O2 swings. A knockout lever 22 having a knockout roller 23 provided coaxially with the fulcrum O2 of the lower lever 21 in conjunction with the lower lever 21 swings, and a lower end portion of the knockout roller 23 comes into contact with the knockout roller 23 in the bed 20. Knockout pins 24A, 24B, 24C which are erected for each of the processing stages N1, N2, N3 are moved up and down. The vertical movement of the knockout pin 24 constitutes a bed knockout device 26 for releasing products adhered to a lower mold (not shown) fixed to the bolster 25 with bolts.

[0010] Each of the processing stages N1, N
2, N3 knockout pins 24A, 24B, 24C
Is a slide 15A that moves up and down with an arbitrary phase difference,
It moves up and down in synchronization with 15B and 15C.

Each processing stage N of the bed 20
A pin guide 27 is buried in the center of 1, N2, and N3 to guide the knockout pin 24 of the bed knockout device 26 that moves up and down slidably on the inner peripheral surface 27A. A bolster 25 is fixed on the bed 20 by bolts (not shown), and a knockout pin 24 is provided at the center of each of the processing stages N1, N2, and N3 on the bed 20.
A guide 28 having a hole 28A penetrating through the guide 28 stands upright.

A nut 29 fitted on the outer peripheral portion and the central portion of the guide 28 has its lower surface in contact with the upper surface of the bed 20 and is screwed into a screw hole 25A provided in the lower portion of the bolster 25. Screw hole 2 of bolster 25 for screwing nut 29
Above 5A, there is provided a hydraulic chamber 25B in which the piston 30 constituted by the insert plate portion 30A and the piston portion 30B is provided. Further, an upper portion thereof is provided with a hole portion 25C for projecting the upper surface slightly above the bolster 25 to slidably guide the outer periphery of the insert plate portion 30A for receiving the load of the slide 15.

Above the hydraulic chamber 25B, a conduit 31A for supplying pressure oil to the hydraulic chamber 25B is provided from the rear surface of the bolster 25, and a hole 2 for guiding the insert plate 30A is provided.
At the lower part of 5C, a conduit 31B for discharging the pressure oil from the hydraulic chamber 25B is provided from the rear surface of the bolster 25, and is connected to the hydraulic supply device 32 shown in FIG. Also, piston 3
A hole 30C that fits with the outer periphery of the distal end of the guide 28 is provided at the lower part of the guide 0, and a hole 30D that penetrates the knockout pin 24 is provided on the hole 30C.

FIGS. 4 and 5 show the overload safety devices 33A, 33B and 33C provided for the respective processing stages N1, N2 and N3 of the bolster 25 as described above.
1 shows an embodiment of a pneumatic hydraulic circuit and a control block for controlling the pressure control. As shown in the pneumatic hydraulic circuit diagram of FIG. 4, the overload safety devices 33A, 33B, and 33C provided inside the respective processing stages N1, N2, and N3 of the bolster 25 have hydraulic supply devices 32A, 32B, and 32C, respectively. The respective hydraulic pressure supply devices 32A, 32B, 32C are unitized and provided on the rear surface of the bed 20 as shown in FIG.

A hydraulic supply device 32 supplies a set pressure of a hydraulic pump 36 provided on an oil tank 35 from an air source 34 so that the overload safety device 33 is broken by pressure oil corresponding to the allowable processing stage capacity. The air pressure to be supplied is adjusted and set by the pressure reducing valve 37, and the pressure oil set by this air pressure is supplied to the hydraulic pump 3.
6 is a supply pipe 3 provided with a hydraulic pressure detector 38 in the middle of the pipe.
The oil is supplied to the hydraulic chamber 25B via a pipe 31A connected to the hydraulic chamber 25. A pipe 31B provided below the hole 25C for guiding the insert plate section 30A is provided with a return pipe 40 for returning oil to the oil tank 35 when the overload safety device 33 is broken.
Is connected to Due to the overload, the hydraulic pressure in the hydraulic chamber 25B of the piston 30 is broken, and the piston 30 descends to the nut 29 side, and pressurized oil flows between the jaw 30E of the piston 30 and the hole 25C of the insert plate 30A. When released, the oil is discharged to oil tank 35 via line 31B.

Further, a switching valve 41 is provided between the supply pipe 39 and the return pipe 40, and detects a hydraulic pressure corresponding to the load of the mold within a preset allowable processing stage capacity. When the detector 38 detects, the hydraulic oil supplied by the hydraulic pump 36 via the pipeline 31A connected to the supply pipe 39 is transferred to the oil tank 35 via the return pipe 40 by switching the switching valve 41. After being discharged, the overload safety device 33 is in a broken state.

When the safety is confirmed and secured after the breakage of the overload safety device 33 and the overload safety device 33 is returned, the switching valve 41 is switched to operate the hydraulic pump 36, thereby providing the supply pipe. A predetermined pressure oil is supplied to the hydraulic chamber 25B via the pipe 39 and the conduit 31A, and the press operation becomes possible.

As shown in the control block diagram of FIG.
Are set to break at a hydraulic pressure corresponding to the allowable processing stage capacity by the pressure reducing valve 37 shown in (1), the set pressure and the breaking pressure of each of the processing stages N1, N2, N3 are converted into an equivalent load by the computing unit 42. And stored in the storage device 43. The load converted by the calculator 42 is displayed on a display 49.
Are displayed for each of the processing stages N1, N2, N3 or simultaneously. Each processing stage N1, N
2. If any one of the oil pressure detectors 38A, 38B, 38C of N3 detects an overload, any of the oil pressure detectors 38
The signals of A, 38B, and 38C are transmitted to the arithmetic unit 42 and the storage device 43 through any of the A / D converters 44A, 44B, and 44C, and are compared and determined with the set values in the storage device 43, and are determined. A signal is transmitted from the input / output port 45 to the press control unit 46 to stop the slide 15 suddenly.

The maximum value of the ability of each mold to be mounted on each of the processing stages N1, N2, and N3, and the minimum value of an arbitrary allowable value load determined in advance from product accuracy are defined as load values. Setting means, for example, the digital switch 47 in this embodiment, stores the data in the storage device 43 via the input / output port 48. If the actual load of any of the processing stages N1, N2, N3 exceeds the maximum value, one of the hydraulic pressure detectors 38
The signals of A, 38B, and 38C are transmitted to the arithmetic unit 42 and the storage device 43 via one of the A / D converters 44A, 44B, and 44C, and are compared and determined by the storage device 43 with the maximum set value. A determination signal is transmitted from the input / output port 45 to the switching valve 41 and the press control unit 46 shown in FIG. 4, and the switching valve 41 is switched to break the overload safety device 33 and stop the slide 15 suddenly.

Each processing stage N1, N2, N3
If any of the actual loads is less than or equal to the minimum value, a signal from any of the hydraulic pressure detectors 38A, 38B, 38C
Via the arithmetic unit 42 and the storage device 43, the storage device 43 compares and determines the minimum set value, transmits a determination signal to the press control unit 46, and stops the slide 15 at the preset crank angle at the fixed position. Note that both the setting of the maximum value and the minimum value by the digital switch 47 are performed within the allowable processing stage capability. Further, in the control block diagram of this embodiment, the load setting means is the digital switch 47, but may be a keyboard switch.

In the first embodiment, the hydraulic supply devices 32A, 32B, and 32C are respectively connected to the overload safety devices 33A, 33B, and 33C provided on the respective processing stages N1, N2, and N3. However, as shown in FIG. 6, each of the overload safety devices 33A, 33B, and 33C is constituted by a single hydraulic pressure supply device 32.
May be configured to be the same. Further, in the present embodiment, as the multi-forging press 1 having three processing stages, each of the processing stages N1,
Although a total of three overload safety devices 33 are provided in N2 and N3, the present invention is not limited to this.

[0022]

As is apparent from the above description, according to the present invention, although there are a plurality of slides which move up and down with an arbitrary phase difference, each machining stage has a corresponding capacity for specification. Load setting and processing load within this overload set pressure can be set. In addition, since the overload safety device is provided on the bolster side, the wiring and piping work between the overload safety device and the hydraulic supply device can be simplified, the slide weight is reduced, and the slide weight including the upper die weight is reduced. The suspension capacity of the counterbalancer that balances can be reduced, and the press machine can be made more compact.

[Brief description of the drawings]

FIG. 1 is a front view of a multi slide press according to a first embodiment of the present invention.

FIG. 2 is also a right side view of the multi slide press.

FIG. 3 is a side sectional view of a main part of the overload safety device.

FIG. 4 is a circuit diagram of a hydraulic supply device of the overload safety device.

FIG. 5 is a control block diagram of the overload safety device.

FIG. 6 is a circuit diagram of a hydraulic pressure supply device according to a second embodiment of the present invention.

[Explanation of symbols]

1 is a multi slide press, 2 is a crown, 2A, 2B
Is a bearing, 3 is a main motor, 4 is a pulley, 5 is a drive shaft, 5A is a drive gear, 6 is a flywheel, 7 is a clutch / brake, 8 is a belt, 9 is an intermediate shaft, 10 is a pinion, and 11 is an intermediate. Gear, 12 is an eccentric shaft, 12A, 1
2B and 12C are eccentric parts, 13 is a main gear, 14, 14
A, 14B, 14C are connecting rods, 15, 15
A, 15B, 15C are slides, 16 is a cam, 17 is a roller, 18 is an upper lever, 19 is a rod, 20 is a bed,
21 is a lower lever, 22 is a knockout lever, 23 is a knockout roller, 24, 24A, 24B and 24C are knockout pins, 25 is a bolster, 25A is a screw hole,
25B is a hydraulic chamber, 25C is a hole, 26 is a bed knockout device, 27 is a pin guide, 27A is an inner peripheral surface, 28 is a guide, 28A is a hole, 29 is a nut, 30 is a piston, 30A is an insert plate, 30B is a piston portion, 30C and 30D are holes, 30E is a jaw portion, 31A,
31B is a pipeline, 32, 32A, 32B, and 32C are hydraulic supply devices, 33, 33A, 33B, and 33C are overload safety devices, 34 is an air source, 35 is an oil tank, 36, 36A, and 3C.
6B, 36C are hydraulic pumps, 37, 37A, 37B, 3
7C is a pressure reducing valve, 38, 38A, 38B and 38C are oil pressure detectors, 39, 39A, 39B and 39C are supply pipes,
0, 40A, 40B, 40C are return pipes, 41, 41
A, 41B, 41C are switching valves, 42 is a computing unit, 43 is a storage device, 44A, 44B, 44C are A / D converters,
5, 48 are input / output ports, 46 is a press control unit,
47 is a digital switch, 49 is a display, N1, N2, N3
Is a processing stage, O1 and O2 are fulcrums.

Claims (2)

[Claims] 1. A product having a plurality of slides driven by one drive source and a bed knockout device, wherein the slides move up and down with an arbitrary phase difference to advance a plurality of molding processes to produce a product shape. In a multi-slide press, a) a guide that stands upright on the bed that abuts the lower surface of the bolster and penetrates the knockout pin of the bed knockout device through the center hole, and b) a hole that fits into the outer periphery of the guide. A nut which is screwed into a screw hole provided in the lower part of the bolster; c) an outer peripheral part is slidably fitted in a hydraulic chamber provided in the upper part of the screw hole of the bolster and an insert hole, A piston having a first hole guided to the outer peripheral portion of the guide and a second hole penetrating the knockout pin and sharing an insert plate function; and d) a bolster in which the piston is provided. A multi-slide press, comprising at least one hydraulic supply device for supplying pressure oil to a hydraulic chamber, and provided on each bolster-side processing stage so as to correspond to each of the plurality of slides. Overload safety device. 2. A load setting means for setting and storing in advance a permissible load for each processing stage and pressure oil corresponding to an actual load at the time of press working within the permissible load range; B) a detector that detects this pressure oil, c) a calculating device that converts the detected value of the detector into a load, and compares the detected value with a set value to judge. An overload safety device for a multi-slide press, comprising: a control unit configured to display a converted value or a set value for each processing stage or simultaneously.