JPH07223109A - Hydraulic rolling cutshear device - Google Patents

Abstract

PURPOSE:To provide a hydraulic rolling cutshear device capable of performing precision rolling shear simply and at a low cost. CONSTITUTION:In a device having a straight knife 2 and a circular knife 6 on a side opposed thereto for cutting a workpiece by forcing the circular knife 6 to make rolling motion without sliding to the straight knife 2, left and right hydraulic cylinders 5a and 5b for hanging and, raising/lowering both ends of a slide 4 to which the circular knife 6 is fixed are provided on a frame 1 and a pair of left and right curved guiding mechanisms 8a and 8b are provided on a slide part above the circular knife 6. Control is made by a driving oil pressure circuit so that oil on the head side of the left and right hydraulic cylinders 5a and 5b flows to the rod side of a hydraulic cylinder on an opposite side in an initial position and after rolling cutting, and at the time of rolling cutting, oil on the rod side of a knife high position side hydraulic cylinder 5a or 5b is returned to a tank, oil is sucked on the rod sides of a knife low side hydraulic cylinder 5b or 5a and oil on the head side is returned to the tank via a proportional relief valve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic rolling cut shear device.

[0002]

2. Description of the Related Art As a shearing method for a material represented by a thick plate, a rolling cut method is known in which an upper blade having a curved surface rolls on a linear lower blade to perform shearing. , Fig. 7 (a) (b) as a means for implementing this
A device as shown in is known. In the prior art of FIG. 7A, a cylinder 102 is provided on the crown side (not shown) as a blade driving mechanism, and racks 103, 103 are provided on pistons protruding from the cylinder 102.
The output shafts of gears 104, 104 meshing with 103 are provided with cams 105, 105 having a shape capable of giving a cycloid locus to the circular arc blade 101.
5, the followers 106, 106 are brought into contact with each other, while a linear or curved groove guide mechanism 107 is provided on one side of the slide 100.
Is provided, and the rolling element 110 on the frame side moves along this to obtain a locus as a rolling blade. Further, in the prior art of FIG. 7 (b), instead of the cam, the slide 100 is suspended by a flexible link mechanism composed of left and right large links 108, 108 and small links 109, 109, and the gear 104, By moving the link mechanism by 104, a cycloid locus is given.

In this prior art, a conventional rolling cutting device, that is, a state in which an upper blade having an arcuate blade is suspended by a crank mechanism, rollers are provided at both end shoulders of the upper blade, and one of the rollers is in contact with a fixed guide In comparison with the one in which the other roller is brought into contact with the arc guide protruding from the side cylinder mechanism, the movement accuracy is good, and since the device does not protrude to the side, there is an advantage that it can be downsized, Since a cam or link mechanism is used as the blade driving mechanism, the number of parts is large, and extremely high precision is required for these parts, which causes a problem of cost increase. Also, as another rolling cut shear device,
A hydraulic type is proposed in Japanese Utility Model Laid-Open No. 3-36712. However, in this prior art, the hydraulic cylinder that suspends the slide is driven up and down by the electro-hydraulic servo control method. That is, in this prior art, the pressure oil from the hydraulic pump is guided to the left and right hydraulic cylinders via the servo valves, respectively, and the strokes of the left and right hydraulic cylinders at any time are sequentially detected by the position detector in order to make the circular arc blades roll, and from this, The stroke position and the correlation positional relationship between the hydraulic cylinders are fed back to the computer for comparison calculation, and the position of each hydraulic cylinder is adjusted.
For this reason, it is possible to obtain a precise rolling motion of the blade, but there are problems that the control becomes very complicated and the cost for using an expensive hydraulic servo system device becomes extremely high.

The present invention was invented to solve the above-mentioned problems, and an object thereof is to provide a hydraulic rolling cut shear device capable of realizing precise rolling shear with a simple and extremely low cost structure. To provide.

[0005]

In order to achieve the above object, the present invention has a straight blade and an arc blade on the side opposite to the straight blade,
In a device for cutting a work by causing the circular arc blade to make a non-slip rolling motion with respect to a linear blade, right and left hydraulic cylinders for suspending and lifting both ends of a slide having the circular arc blade fixed to a frame are provided, and the circular arc blade is also provided. Providing a pair of left and right curved guide mechanisms in the upper slide area,
In addition, the left and right hydraulic cylinders are connected to the drive hydraulic circuit so that the oil flow to them will satisfy the following conditions. a. At the initial position, the left and right hydraulic cylinders have different piston protrusion lengths.In this state, when the initial feeding is performed, the pressure oil from the hydraulic pressure generator is sent to the head side of one hydraulic cylinder and the rod side of that hydraulic cylinder Oil is sent to the head side of the other hydraulic cylinder, and the oil on the rod side of the hydraulic cylinder is returned to the tank. b. At the time of rolling cutting, pressure oil from the hydraulic pressure generator is sent to the head side of the hydraulic cylinder on the high blade side, oil on the rod side of the hydraulic cylinder is returned to the tank, and the rod side of the hydraulic cylinder on the low blade side is Oil is sucked from the tank, and the oil on the head side of the hydraulic cylinder is returned to the tank via the electromagnetic proportional relief valve. c. After rolling cutting, the pressure oil from the hydraulic pressure generator is sent to the rod side of the hydraulic cylinder that has changed to the lower blade position, and the oil on the head side of the hydraulic cylinder moves to the rod side of the hydraulic cylinder that has become the higher blade position. The oil is sent and the oil on the head side of the hydraulic cylinder is returned to the tank. Preferably, the curved guide mechanism includes a first curved groove that is lowered toward an end in the width direction of the slide, a second curved groove that extends to a lower end of the first curved groove and extends upward at a required angle, and a crown portion that penetrates the groove. It has a supported pin and is provided at a position closer to the inner side than the position where the hydraulic cylinder is disposed.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show an embodiment of a hydraulic rolling cut shear device according to the present invention, in which 1 is a frame installed on a base floor, on which a work W such as a thick plate is placed and moved in the middle in the height direction. The table 1'is provided with a linear blade 2 as a lower blade, which is fixed to the front edge of the table 1 '. Reference numerals 3 and 3 denote crown portions (upper frame) which are horizontally provided on the frame above the table 1'and are preferably parallel plates. Reference numeral 4 denotes a slide arranged in a space between the crown portions 3 and 3, which is frame-shaped by rigidly connecting front and rear two face plates 40 and 40 with upper and lower connecting members 41 and 42. An arcuate blade (including the approximate elliptical blade, the same applies hereinafter) 6 having a required curvature as an upper blade is replaceably fixed to the lower end of the rear face plate 40 by a screw. 5a, 5b are hinge mechanisms 52a, 5 in the upper space portions of the crown portions 3, 3 on the outer side in the width direction with respect to the circular arc blade 6.
2b is a pair of left and right hydraulic cylinders vertically oscillated by 2b. The piston rods 50a and 50b of the hydraulic cylinders 5a and 5b are attached to the face plate 4 of the slide 4.
It extends between 0 and 40, and each pistun rod 50a, 50b
The bearings 51a, 51b at the lower end of the are connected to the support pins 7a, 7b which are laterally supported between the face plates 40, 40, whereby the slide 4 with an arc blade is swingably suspended. 8
Reference numerals a and 8b are a pair of left and right curvilinear groove-shaped guide mechanisms for restricting the horizontal and vertical movements of the slide 4 to ensure the rolling movement of the circular arc blade. As shown in FIG. The center line C is located at a position closer to the inner side in the width direction than the installation position and above the support pins 7a and 7b.
They are provided symmetrically with L in between.

The pair of curved groove-shaped guide mechanisms 8a and 8b are
As shown in FIGS. 1 and 3, it has a first curved groove 80 that is lowered toward the widthwise end of the slide 4 and a second curved groove 81 that extends to a lower end of the first curved groove 80 and extends upward at a required angle. These grooves are either one of the front and rear face plates 40, 40,
It is preferably provided on both sides. And crown 3,
3 are pins (or rollers) 82a, 8 which fit in the grooves.
2b is attached via a bearing. Groove 8 on one side of face plate
When 0 and 81 are provided, the other face plate is provided with a window hole or a notch so as to allow free movement of the pin. The meaning of providing the grooves 80 and 81 of the curved groove-shaped guide mechanisms 8a and 8b on the face plate means not only the case of directly punching the face plate as in this embodiment, but also the plate of the separate body which has been machined. It includes fitting and fixing in the window hole portion provided in the face plate, and superimposing and fixing around the window hole. In the initial position, the hydraulic cylinders 5a and 5b have a different length relationship in which one piston rod 50a or 50b extends more than the other, so that the slide 4 and the arcuate blade 6 attached thereto move to the left or right when viewed from the front. It will be tilted.

Reference numerals 9 and 9 denote plate-thickness direction guides provided on the frame 1 so as to correspond to both sides of the slide 4 in the width direction. Reference numeral 10 denotes a plate pressing mechanism provided behind the crown 3, which lifts the pressing plate 10a and the plate. And a hydraulic cylinder 10b. 11
Is a reverse pressing mechanism provided so as to face the circular arc blade 6, a guide 11a fixed to the frame 1, a reverse pressing plate 11b movable along the guide 11a, and a reverse pressing for supporting and lifting the reverse pressing plate 11b. It is composed of a hydraulic cylinder 11c.

Reference numeral 12 denotes a hydraulic circuit unit arranged in or near the frame 1 for driving the hydraulic cylinders 5a and 5b. The hydraulic circuit unit 12 is provided with a hydraulic circuit shown in FIG. Like a hydraulic pump 1
Hydraulic pressure generating device 12 'including 3 and a plurality of directional control valves 1
4 to 18 and a control valve system 12 ″ including a relief valve 19. a. In the initial position, the left and right hydraulic cylinders 5a and 5b have different piston protrusion lengths, and in this state, one hydraulic pressure at the time of initial feeding. A hydraulic pressure generator 12 'is provided on the head side of the cylinder 5b.
Pressure oil from the hydraulic cylinder 5b
The oil on the rod side is sent to the head side of the other hydraulic cylinder 5a, and the oil on the rod side of the hydraulic cylinder 5a is returned to the tank 20. b. At the time of rolling cutting, the pressure oil from the hydraulic pressure generator 12 'is sequentially fed to the head side of the hydraulic cylinder 5b or 5a on the blade high side, and the oil on the rod side of the hydraulic cylinder 5b or 5a is returned to the tank 20. The rod side of the hydraulic cylinder 5a or 5b on the lower blade side is the tank 20.
Oil is sucked from the oil, and the oil on the head side of the hydraulic cylinder 5a or 5b is sequentially returned to the tank 20 'via a relief valve. c. After the rolling cutting, the pressure oil from the hydraulic pressure generating device 12 'is fed to the rod side of the hydraulic cylinder 5b or 5a which has changed to the blade lower side, and at the same time the hydraulic cylinder 5b or 5a.
Hydraulic cylinder 5a in which the oil on the head side of a is on the blade high side
Alternatively, the hydraulic cylinder 5a is fed to the rod side of 5b.
Alternatively, the oil on the head side of 5b is returned to the tank 20.

The circuit configuration will be described in detail. The directional control valves 14 to 18 are preferably electromagnetically actuated, for example, double-ended solenoid type 4-port, 3-position directional control valves, and the first directional control valve 14 forming a pair with the left hydraulic cylinder 5a. And the second directional control valve 15 that forms a pair with the right hydraulic cylinder 5b, the head side chambers 500a and 500b of the hydraulic cylinders 5a and 5b whose cylinder ports A form a pair by the pipes 140 and 150, respectively.
It is connected to the. The rod-side chamber 501a of the left hydraulic cylinder 5a is connected to the tank port T of the second directional control valve 15 which forms a pair with the right hydraulic cylinder 5b through the intersecting pipe 141.
Connected to the rod side chamber 501b of the right hydraulic cylinder 5b.
Is connected to the tank port T of the first directional control valve 14 forming a pair with the left hydraulic cylinder 5a by a crossing pipe 151. The third directional control valve 16 is a lowering valve and is the first,
It is arranged on the upstream side of the second directional control valves 14 and 15, and the discharge port 130 of the hydraulic pump 13 is connected to the pump port P via a check valve 131. The two cylinder ports A and B of the third directional control valve 16 are communicated with the tank port T at the neutral position.
Is connected to the tank 20. The cylinder port A of the third directional control valve 16 is the first paired with the left hydraulic cylinder 5a.
The cylinder port B is connected to the pump port P of the direction switching valve 14.
Is connected to the pump port P of the second directional control valve 15 that forms a pair with the right hydraulic cylinder 5b via pipes 160 and 161 respectively.

The fourth directional control valve 17 is an ascending valve, and a discharge port 130 of the hydraulic pump 13 is connected to the pump port P. In the fourth directional control valve 17, the two cylinder ports A and B are also in communication with the tank port T at the neutral position, and the tank port T is connected to the tank 20. The cylinder port A is connected to the cylinder port B of the first directional control valve 14 that forms a pair with the left hydraulic cylinder 5a by a pipe 170, and the cylinder port B forms a pair with the right hydraulic cylinder 5b by a pipe 171. It is connected to the cylinder port B of the direction switching valve 15. The fifth directional control valve 18 uses a proportional relief valve, preferably an electromagnetic proportional relief valve 19 for the oil on the head side of either the left or right hydraulic cylinder 5a or 5b during the rolling disconnection period.
It is a valve for returning to the tank 20 ′ while generating the pressure set in step. In the neutral position, the fifth directional control valve 18 blocks all pump ports P, cylinder ports A and B, and tank port T, and the head of either hydraulic cylinder (the left hydraulic cylinder 5a in this embodiment) is located at the pump port P. The side chamber 500a is connected by the pipe 180, and the head side chamber 500b of the other hydraulic cylinder (the right hydraulic cylinder 5b in this embodiment) is connected to the pipe 181 at the tank port T.
Connected by. The electromagnetic proportional relief valve 19 is connected to the cylinder port A of the fifth direction switching valve 18 by a pipe 182.

[0012]

Operation of the Embodiment Next, the operating condition and operation of the device shown in the embodiment will be described. 5 (a) to 5 (e) show the movement of the circular arc blade in one cycle of shearing, and FIG. 6 shows the operation sequence of each valve of the drive circuit. FIG. 5 (a) shows the state of the initial position. A shows the position of the support pin 7a of the left hydraulic cylinder 5a, and B shows the position of the support pin 7b of the left hydraulic cylinder 5b. As shown in FIG. 4, the piston rod 50a of the left hydraulic cylinder 5a is the right hydraulic cylinder 5b.
Since it projects longer than the piston rod 50b, the arcuate blade 6 (also the slide) descends to the left. In this state, the pin 82a corresponding to the lower hydraulic cylinder 5a on the lower side is at the end position of the second curved groove 81, and the pin 82b corresponding to the upper right hydraulic cylinder 5b is on the starting end of the first curved groove 80. In position. In this way, the pins 82a, 82
Due to the fitting relationship between b and the curved groove, the lowermost end of the circular arc blade 6 is held at a position separated from the upper end of the linear blade 2 by a predetermined distance. At this time, the first to fifth directional control valves 14 to 18 are placed in the neutral position.

In this state, the first solenoid 14SOL1 of the first direction switching valve 14 is turned on, the second solenoid 15SOL2 of the second direction switching valve 15 is turned on, and the first solenoid 14SOL of the third direction switching valve 16 is turned on.
Turn on solenoid 16SOL1. In this way, the pressure oil from the hydraulic pump 13 of the hydraulic pressure generator 12 is discharged from the discharge pipe line 130.
To the third directional control valve 16, the cylinder port B to the second directional control valve 15 via the pipe 161 and the cylinder port A to the right hydraulic cylinder 5 via the pipe 150.
b head chamber 500b, the piston rod 5
0b descends. The oil on the rod side pressed by the piston due to the lowering of the piston rod 50b reaches the first directional control valve 14 from the pipe 151, passes from the cylinder port A through the pipe 140, and the head side chamber 500a of the left hydraulic cylinder 5a.
Be led to. Therefore, the piston rod 50a of the hydraulic cylinder descends. The oil pressed by the piston is pipe 14
1 to the second directional control valve 15, from the cylinder port B of the valve to the fourth directional control valve 17 via the pipe 171 and then to the tank 20 from the tank port T. Therefore, by appropriately setting the ratio of the area on the head side of the cylinder to the area on the rod side, the left hydraulic cylinder 5a and the right hydraulic cylinder 5b simultaneously descend at a constant ratio, which causes the circular arc blade 6 to move downward as shown in FIG. 5), the left edge of the arcuate blade 6 intersects with the linear blade 2 and enters the initial biting state, as shown in FIG. 5B. The descending stroke is larger than the stroke SA of the left hydraulic cylinder 5a because the stroke SB of the right hydraulic cylinder 5b is larger in order to increase the stroke (spm) per unit time. At this stage, the pin 82a on the left hydraulic cylinder 5a side
Reaches the intersection of the first curved groove 80 and the second curved groove 81 or a position in the vicinity thereof, and the pin 82b on the right hydraulic cylinder 5b side reaches a position appropriately lowered from the starting end of the first curved groove 80.

At this stage, the second solenoid 15SOL2 of the second directional control valve 15 and the first solenoid 17SOL of the third directional control valve 17
While keeping 1 on, the first solenoid 14SOL1 of the first directional control valve 14 is turned off, and the fifth directional control valve 18
2 The solenoid 18SOL2 is turned on and the solenoid of the electromagnetic relief valve 19 is turned on. In this way, the hydraulic pressure generator 1
The pressure oil from 2 is the cylinder port B of the third directional control valve 16.
Is sent from the pipe 150 to the head side chamber 500b of the right hydraulic cylinder 5b through the second directional control valve 15, oil in the rod side chamber is sent from the pipe 151 to the first directional control valve 14, and from the cylinder port B. It is guided to the tank 20 via the tank port of the fourth directional control valve 17. Therefore, the piston rod 50b of the right hydraulic cylinder 5b is successively pressurized and lowered. On the other hand, the operation is stopped because the oil is not positively sent to the left hydraulic cylinder 5a. Therefore, the circular arc blade 6 starts tilting clockwise from the initial biting state, and at this time,
The pin 82a on the left hydraulic cylinder 5a side starts to move into the first curved groove 80 from the position of FIG.
The pin 82b on the side starts moving from the position shown in FIG. 5B toward the end of the first curved groove 80, whereby rolling cutting is started.

At the time of this rolling cutting, the cutting reaction force is the circular arc blade 6
And the piston rod 50a acts on the left hydraulic cylinder 5a.
Be pushed into. The pressure generated by this causes the oil on the head side of the left hydraulic cylinder 5a to be pressed, so that the oil is supplied to the conduit 180.
To the fifth directional control valve 18 via the cylinder port A
Is sent to the electromagnetic proportional relief valve 19, and when the set pressure is reached, the oil is guided to the tank 20 ′. At the same time, the oil in the tank 20 flows from the cylinder port B of the fourth directional control valve 17 to the conduit 17
It is sucked to the rod side of the left hydraulic cylinder 5a from the pipe 141 through the first and second directional control valves 15. Therefore, the head side of the left hydraulic cylinder 5a is connected to the electromagnetic proportional relief valve 19
It rises at the pressure set in. Therefore, the arc blade 6
The left end gradually rises to the state shown in FIG. 5 (c), and from this state, the right end region of the circular arc blade 6 approaches the linear blade 2, and finally the circular arc blade 6 moves as shown in FIG. 5 (d). In this rolling cutting process in which the right end intersects the linear blade 2 to complete the rolling cutting, the pin 82a on the left hydraulic cylinder 5a side is the first
Since the pin 82b on the right hydraulic cylinder 5b side moves toward the end of the first curved groove 80 toward the start end of the curved groove 80, the circular arc blade 6 realizes a precise rolling motion, and when the rolling cutting is completed. 5D, the pin 82a is located at a position near the starting end of the first curved groove 80, as shown in FIG.
b reaches the intersection of the first curved groove 80 and the second curved groove 81 or a position in the vicinity thereof. At this stage, in the second directional control valve 15, the second solenoid 15SOL2 is turned off and the first solenoid 15SOL1 is turned on. The third directional control valve 16
1 Solenoid 16SOL1 is turned off. Further, the second solenoid 18SOL2 of the fifth direction switching valve 18 is turned off, and the solenoid of the electromagnetic relief valve 19 is also turned off. Then, the second solenoid 14SOL2 of the first directional control valve 14, which has been turned off and kept at the neutral position until then, is turned on and the second solenoid 17SOL2 of the fourth directional control valve 17 is turned on.

As a result, the pressure oil from the hydraulic pressure generator 12 passes through the cylinder port A of the fourth directional control valve 17 and the conduit 17
It is sent to the rod side of the right hydraulic cylinder 5b via 0,
The oil in the head side chamber 500b of the hydraulic cylinder is transferred to the conduit 141.
Is sent to the rod side of the left hydraulic cylinder 5a via the pipe, and the oil in the head side chamber 500a of the left hydraulic cylinder 5a is transferred to the conduit 1
40 through the first directional control valve 14 to the third directional control valve 16
It is led to the tank 20 through the. Therefore, the piston rods of the left and right hydraulic cylinders 5a and 5b simultaneously rise at a constant rate, and the arcuate blade 6 rises in a state of descending to the right as shown in FIG. 5 (e). In this ascending process, the pin 82a on the left hydraulic cylinder 5a side moves to the starting end of the first curved groove 80, and the pin 82b on the right hydraulic cylinder 5b side moves to the second curved groove 8
One reaches the end. This completes one rolling cut shear. Then, when shearing the next part of the work or the second shearing at the same position, the second solenoid 14SOL2 of the first directional control valve 14 is turned on and the second directional control valve is turned on as shown in the sequence diagram of FIG. The first solenoid 15SOL of No. 15 is turned on, and the second solenoid 16SOL2 of the third directional control valve 16 is turned on, whereby the piston rods of the left and right hydraulic cylinders 5a, 5b simultaneously descend at a constant ratio, and The arcuate blade 6 in the state of e) descends and enters the initial biting state. Then, during the rolling disconnection period, the first solenoid 15SOL1 of the second directional control valve 15 is
Is turned off, and the second solenoid 14 of the first direction switching valve 14 is turned on.
SOL2 and second solenoid 16S of third directional control valve 16
The first directional control valve 18 of the fifth directional control valve 18 is maintained while keeping the OL2 ON.
Solenoid 18SOL1 is turned on and electromagnetic relief valve 1
The solenoid 9 is turned on.

In this way, the oil discharged from the hydraulic pressure generator 12 is supplied from the cylinder port A of the third directional control valve 16 to the pipe line 1.
Head side chamber 500a of the left hydraulic cylinder 5a
The oil on the rod side of the hydraulic cylinder is sent to the head side chamber 5 of the right hydraulic cylinder 5b via the second direction switching valve 15.
00b and the oil on the rod side of the hydraulic cylinder is returned to the tank 20, so that the piston rod 50a of the left hydraulic cylinder 5a is successively pressurized and lowered. On the other hand, the operation is stopped because oil is not positively sent to the right hydraulic cylinder 5b. Therefore, the circular arc blade 6 starts tilting counterclockwise from the initial biting state, which is the reverse of the above. The rolling cutting in the tilting direction is started, and the piston rod 50b of the right hydraulic cylinder 5b is pushed up by the reaction force, so that the oil in the head side chamber 500b of the right hydraulic cylinder 5b is transferred to the tank 20 'via the electromagnetic electromagnetic relief valve 19. The oil is sucked from the tank of the fourth directional control valve 17 via the first directional control valve 14 on the rod side of the right hydraulic cylinder 5b. Thus, when the rolling shear is completed and the blade is lifted, the second solenoid 16SOL2 of the third directional control valve 16 is turned off and the first directional control valve 18 of the first directional control valve 18 is turned off.
Solenoid 18SOL1 is turned off and electromagnetic relief valve 1
The solenoid 9 is also turned off. And the first directional control valve 1
The second solenoid 4 is turned off, and the first solenoid 14SO
L1 is turned on and the second solenoid 15SOL2 of the second directional control valve 15 is turned on. As a result, the piston rods of the left and right hydraulic cylinders 5a and 5b simultaneously rise at a constant rate and return to the initial position shown in FIG. 5 (a). The precise rolling cutting can be repeated by repeatedly operating as described above.

[0018]

According to the present invention described above, an accurate rolling motion can be realized by using only a simple hydraulic cylinder that operates in the vertical direction and two curved guide mechanisms on the left and right as a drive system. Since the complicated position control of the left and right cylinders is not required, it is possible to obtain the excellent effect that precise thick plates can be cut with an extremely simple and low-cost structure.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line II-II of FIG. 2 showing an embodiment of a hydraulic rolling cut shear device according to the present invention.

FIG. 2 is a vertical sectional side view showing an embodiment of a hydraulic rolling cut shear device according to the present invention.

FIG. 3 is an enlarged front view of the curved guide mechanism according to the present invention.

FIG. 4 is a drive hydraulic circuit diagram in the present invention.

FIG. 5 is an explanatory view showing a cutting process step by step according to the present invention.

FIG. 6 is an operation sequence diagram of the drive hydraulic circuit of the present invention.

FIG. 7 is a perspective view of a conventional rolling cut shear device.

[Explanation of symbols]

 1 frame 2 straight blades 3, 3 crown part 4 slide 5a left hydraulic cylinder 5b right hydraulic cylinder 6 circular arc blades 7a, 7b support pins 8a, 8b curved guide mechanism 12 'hydraulic pressure generator 14 first direction switching valve 15 second direction Switching valve 16 Third direction switching valve 17 Fourth direction switching valve 18 Fifth direction switching valve 19 Electromagnetic proportional relief valve 40, 40 Face plate 50a, 50b Piston rod 80 First curved groove 81 Second curved groove 82a, 82b Pin

Front Page Continuation (72) Inventor Masao Murakawa 3-4 Shin-Shiraoka, Shiraoka-cho, Minamisaitama-gun, Saitama Prefecture

Claims (4)

[Claims] 1. An apparatus for cutting a work by having a straight blade 2 and a circular arc blade 6 on the side opposite to the straight blade 2, and causing the circular arc blade 6 to make a non-slip rolling motion with respect to the straight blade 2. The left and right hydraulic cylinders 5a and 5b for suspending and raising and lowering both ends of the slide 4 having the arc blade 6 fixed thereto are provided, and a pair of left and right curved guide mechanisms 8a and 8b are provided at the slide portion above the arc blade 6, A hydraulic rolling cut shear device characterized in that the left and right hydraulic cylinders 5a, 5b are connected to a drive hydraulic circuit 12 so that the flow of oil with respect to them will satisfy the following conditions. a. At the initial position, the left and right hydraulic cylinders 5a and 5b have different piston protrusion lengths, and in this state, pressure oil from the hydraulic pressure generator 12 'is fed to the head side of one hydraulic cylinder 5b or 5a at the time of initial biting. At the same time, the oil on the rod side of the hydraulic cylinder 5b or 5a is sent to the head side of the other hydraulic cylinder 5a or 5b, and the oil on the rod side of the hydraulic cylinder 5a or 5b is returned to the tank 20. b. At the time of rolling cutting, the pressure oil from the hydraulic pressure generator 12 'is fed to the head side of the hydraulic cylinder 5b or 5a on the blade high position side, and the oil on the rod side of the hydraulic cylinder 5b or 5a is returned to the tank 20, The rod side of the lower hydraulic cylinder 5a or 5b sucks oil from the tank 20, and the oil on the head side of the hydraulic cylinder 5a or 5b is returned to the tank 20 'via the proportional relief valve 19. c. After the rolling cutting, the pressure oil from the hydraulic pressure generating device 12 'is fed to the rod side of the hydraulic cylinder 5b or 5a which has changed to the blade lower side, and at the same time the hydraulic cylinder 5b or 5a.
Hydraulic cylinder 5a in which the oil on the head side of a is on the blade high side
Alternatively, the hydraulic cylinder 5a is fed to the rod side of 5b.
Alternatively, the oil on the head side of 5b is returned to the tank 20. 2. The curved guide mechanism 8a, 8b is a slide 4
The first curved groove 80 which is lowered toward the end in the width direction and the second curved groove 8 which is connected to the lowermost end of the first curved groove 80 and extends upward at a required angle
The hydraulic pressure according to claim 1, further comprising a pin 1 and a pin 82a, 82b which penetrates the groove and is supported by the crown portions 3, 3, and which is provided at a position closer to the inner side than the position where the hydraulic cylinders 5a, 5b are disposed. Type rolling cut shear device. 3. A slide 4 has two front and rear face plates 40, 40, and left and right hydraulic cylinders 5a, 5b are provided between the face plates 40, 40.
Piston rods 50a and 50b extend to support pin 7
The curved guide mechanism 8 is pivotally supported by a and 7b.
The first curved groove 80 and the second curved groove 81 of a and 8b are provided on at least one of the face plates 40 and 40.
Alternatively, the hydraulic rolling cut shear device according to claim 2. 4. The rod of the right hydraulic cylinder 5b is connected to a fourth directional switching valve 17 for raising by way of a second directional switching valve 15 connected to the rod side of the left hydraulic cylinder 5a and the head side of the right hydraulic cylinder 5b. The side is connected to the fourth direction switching valve 17 via the first direction switching valve 14 connected to the head side of the left hydraulic cylinder 5a, and the fourth direction switching valve 17 is connected to the discharge line of the hydraulic pressure generator 12 '. At the same time, the discharge pipes upstream of the fourth directional control valve 17 are connected to the descending third directional control valve 16 whose cylinder ports are connected to the first directional control valve 14 and the second directional control valve 15, respectively. The hydraulic rolling cut shear device according to any one of claims 1 to 3, wherein the head sides of the left and right hydraulic cylinders 5a, 5b are connected to an electromagnetic proportional relief valve 19 via a fifth direction switching valve 18.