JPH0141455B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shearing machine, and more particularly, the inclination angle (shear angle) of the upper blade relative to the lower blade in the shearing machine is determined by adjusting the inclination angle (shear angle) of the upper blade to the lower blade of the plate-shaped workpiece to be sheared. This invention relates to a shearing machine configured to automatically adjust according to the thickness.

Conventionally, the inclination angle (shear angle; rake angle) of the upper blade relative to the lower blade in a shearing machine has been manually adjusted by an operator according to the thickness of the workpiece to be sheared. . Therefore, when shearing workpieces of various thicknesses such as in high-mix, low-volume production, the shear angle must be adjusted manually each time, which is extremely troublesome, and it is difficult to improve the efficiency of shearing work. , there are problems with automation, etc.

This invention was invented in view of the conventional problems as described above, and its first purpose is to automatically adjust the shear angle according to the thickness of the workpiece to be sheared. This object is achieved by providing a control device that controls the amount of adjustment of the shear angle in accordance with the amount detected by a detection device that detects the thickness of a workpiece placed on a table.

An embodiment of the present invention will be described in detail below with reference to the drawings. In the following explanation, "left and right" refers to a direction corresponding to the left and right direction in FIG. 1, "front and back" refers to a direction corresponding to the left and right direction in FIG. The directions corresponding to the top and bottom in FIGS. 1 and 2 are called.

As shown in FIGS. 1 and 2, the shearing machine 1 has C-shaped side plates 5 and 7 erected near both left and right sides of a base 3, and the left and right side plates 5 and 7 are provided with beam members 9, They are integrally connected by a front plate 11, a table 13, and the like. As shown in FIG. 2, the table 13 corresponds to the pockets of the side plates 5 and 7, and has a lower blade extending in the left-right direction on the rear side edge (the right edge in FIG. 2). 15 are integrally attached with fasteners such as bolts.

Left and right drive cylinders 17 and 19 are mounted inside the upper portions of the left and right side plates 5 and 7, respectively. The pressure receiving area on the rod side of the right drive cylinder 19 and the pressure receiving area on the head side of the left drive cylinder 17 are set to be equal. The lower end of each piston rod 21, 23 provided in each drive cylinder 17, 19 so as to be movable up and down is swingably connected to the upper part of a ram 25 via a suitable connecting device. An upper blade 27 corresponding to the lower blade 15 is integrally attached to the lower edge of the ram 25 by a suitable fixture. Therefore, by operating the left and right drive cylinders 17 and 19, the ram 25 is moved up and down, and the plate-shaped workpiece W placed on the table 13 is moved by the cooperation between the lower blade 15 and the upper blade 27. It will be sheared due to the action.

As mentioned above, prior to shearing the workpiece W by the lower blade 15 and the upper blade 27, the upper blade 27 and The distance from the lower blade 15 can be adjusted according to the thickness of the workpiece W, and the left and right drive cylinders 17, 1
The inclination of the ram 25 and the upper blade 27 with respect to the lower blade 15 can be adjusted as appropriate by supplying pressure oil to only one of the cylinders 9, or by discharging oil from one side and allowing one of the drive cylinders to advance as appropriate. This allows the shear angle to be adjusted. In addition, the upper blade 27 and the lower blade 15
To adjust the distance (clearance adjustment) with Ram 25
This is also possible by providing the table 13 so that it can be moved and adjusted in the front and back direction (left and right in FIG. 2) without swinging in the front and rear directions.

As a part of the adjustment device for adjusting the clearance, a rectangular parallelepiped-shaped ram guide 29 (only one is shown in the drawing) is provided inside the left and right side plates 5 and 7 through a pivot 31 in the front-rear direction. It is pivoted so that it can swing freely. Each ram guide 29 is
It engages appropriately with the left and right sides of the ram 25 (the engaged state is not shown) and slides and guides the ram 25 in the vertical direction. Near the lower end of each ram guide 29 is a fixed shaft 33 fixed to the side plates 5 and 7, respectively.
The eccentric cam 35 is rotatably fitted to the eccentric cam 35, which is rotatably fitted to the eccentric cam 35. Therefore, by appropriately rotating the eccentric cam 35, the ram guide 29 is aligned with the pivot shaft 3.
1 in the front-rear direction (left-right direction in FIG. 2). Therefore, the ram 25 guided by the ram guide 29 is swung back and forth integrally with the ram guide 29, and the upper blade 27 and the lower blade 1
5 will be adjusted. Incidentally, the displacement in the vertical direction due to rotation of the eccentric cam 35 can be absorbed by an appropriate structure, such as making the fitting hole between the eccentric cam 35 and the ram guide 29 a long hole in the vertical direction. , detailed explanation will be omitted.

An arm 37 extending rearward is integrally attached to each of the eccentric cams 35, and the lower end of a rod 39 is pivotally connected to the tip of the arm 37. The upper end of this rod 39 is connected to the rotation shaft 4.
It is pivotally connected to the tip of an arm 43 that is integrally attached to 1. The rotation shaft 41 is rotatably supported by the beam member 9 via a plurality of bearings 45 . The rotation shaft 41 extends in the left-right direction, and actuating arms 47 are integrally attached near both ends thereof. Each actuation arm 47
The tip of the piston rod 51 of the actuating cylinder 49 is suitably pivotally connected to the tip of the piston rod 51 of the actuating cylinder 49, which is suitably mounted on the beam member 9. Therefore, when the actuating cylinder 49 is actuated appropriately, the eccentric cam 35 is appropriately rotated via the actuating arm 47, the rotation shaft 41, the arm 43, and the rod 39, and the lower blade 15 is rotated as described above. The distance between the upper blade 27 and the upper blade 27 is adjusted. Therefore, by appropriately controlling the amount of operation of the actuating cylinder 49, the distance between the lower blade 15 and the upper blade 27 can be appropriately controlled.

A control device for controlling the amount of operation of the actuating cylinder 49 is mounted on the rotating shaft 41.
That is, as shown in FIGS. 3 and 4, a lever 53 is integrally attached to the rotation shaft 41.
A control valve 55 for controlling the operation of the actuation cylinder 49 is bonded to this lever 53.
This control valve 55 is connected to the rotating shaft 4 via a bearing or the like.
The actuating cylinder 49 is extended by engaging with a cam 59 attached to a control lever 57 rotatably supported by the cam 5.
When the engagement with the cylinder 9 is released, the operation of the operating cylinder 49 is stopped. Therefore, when the control lever 57 is appropriately rotated with respect to the rotation shaft 41, the cam 59 and the control valve 55 are engaged, and the rotation position of the control lever 57 is set with respect to the rotation shaft 41. , the operating cylinder 49 operates to rotate the rotation shaft 41 appropriately. Rotation axis 41
When the lever 53 integrally rotates and the control valve 55 is disengaged from the cam 59, the actuation cylinder 49 stops operating and the rotation shaft 41 stops rotating. That is, the control valve 5
5 and the cam 59, etc., the amount of operation of the actuating cylinder 49 can be controlled, and the interval between the lower blade 15 and the upper blade 27 can be adjusted and set. A traction rod 61 is connected to the control lever 57, and a bullet 65 such as a coil spring is loaded between a spring seat 63 attached to the end of the traction rod 61 and the beam member 9. There is. Therefore, the control lever 57 is always biased in a direction away from the control valve 55 (clockwise in FIG. 3).

As shown in FIG. 1, a plurality of plate holding devices 67 are mounted on the lower edge of the front plate 11 at appropriate intervals in the left-right direction. As described above, when shearing the workpiece W using the upper blade 27 and the lower blade 15, the plate holding device 67 holds the workpiece W before shearing the workpiece W.
This serves to press and fix the table 13 to the upper surface of the table 13. The plate holding device 67 may have a normal configuration, and for example, as shown schematically in FIG. 73, and the pressing pad 73 is always urged upward by an internal spring 75. That is, in the plate holding device 67, the pressing pad 73 is pressed against the spring 75 by supplying pressure oil, and the workpiece W is pressed and fixed. When the pressure oil is discharged from the cylinder main body 69, the pressure pad 73 and the like are raised and returned to their original positions by the action of the internal spring 75, thereby releasing the workpiece W from being pressed and fixed.

Support levers 77, such as bell cranks, are pivotally attached to a suitable number of locations on the front plate 11 via pins 79 as part of a detection device for detecting the thickness of the work W. One end of the support levers 77 A plate-shaped detection member 81 for detecting the thickness of the workpiece W placed on the table 13 is pivotally supported. The detection member 81 moves up and down while keeping it horizontal by rotating the support lever 77.
As shown in FIG. 1, the lower edge of the plate 1 is always in contact with the upper surface of the pressing pad 73 in the plate holding device 67. Therefore, the detection member 81 descends following the descent of the pressing pad 73.
When the pressing pad 73 presses and fixes the work W on the upper surface of the table 13 and stops descending, the work W
This is to detect the plate thickness. That is, the lowered position of the detection member 81 when the pressing pad 73 is in direct contact with the upper surface of the table 13 becomes the reference position where the thickness of the workpiece W is zero. Therefore, when the pressing pad 73 presses the workpiece W, the detection member 81 is positioned above the reference position and the thickness of the workpiece W can be detected.

Note that in this embodiment, the pressing pad 7
3, the lower edge of the detection member 81 is lower than the workpiece W.
It is also possible to adopt a configuration in which the plate thickness of the workpiece W is detected by directly contacting the upper surface of the workpiece W. In this case, the position where the lower edge of the detection member 81 directly contacts the upper surface of the table 13 becomes zero plate thickness and becomes the reference position.

The other end of each of the support levers 77 is pivotally connected to a connecting rod 83. Therefore, the support lever 77 reciprocates due to the reciprocating movement of the connecting rod 83, and the detection member 8
1 will be moved up and down. One end of the connecting rod 83 is connected via a suitable joint member to the end of a piston rod 87 slidably provided on a detection actuation cylinder 85 mounted at a suitable position on the front plate 11 or the like. The detection actuation cylinder 85 moves the detection member 81 up and down via the connecting rod 83 and the like.
That is, when the detection operation cylinder 85 is operated by supplying pressure oil, the connecting rod 83 is pulled to the right in FIGS. 1 and 5, and the detection member 81 is lowered via the support lever 77 and the like. It is what it is.

One end of a suitable connecting body 89 such as a wire, chain, etc. is connected to the other end of the connecting rod 83. This connecting body 89, as shown in FIG.
It is hung around rotating wheels 91 and 93 such as sprockets rotatably mounted on the front plate 11, and the other end is connected to the control lever 5, as shown in FIG.
7 as appropriate. Therefore, when the detection actuation cylinder 85 is actuated to lower the detection member 81, the control lever 57 is pulled against the ammunition 65 via the connecting rod 83 and the connecting body 89, and the rotation shaft 41 is pulled. It will be rotated around. That is, the lowering operation of the detection member 81 and the control lever 57
The amount of rotation of the control lever 57 from the reference position corresponds to the amount of descent of the detection member 81 from the highest position. In other words, the amount of rotation of the control lever 57 corresponds to the thickness of the workpiece W detected when the detection member 81 stops descending. Therefore, the operating amount of the operating cylinder 49 can be controlled according to the thickness of the workpiece W, and the lower blade 15 and the upper blade 27
This allows the distance between the workpiece W and the workpiece W to be automatically set according to the thickness of the workpiece W.

As shown in FIG. 1, one end of a link 95 is pivotally connected to an appropriate position of the connecting rod 83.
The other end of this link 95 is connected to a lever 99 rotatably supported on the front plate 11 via a hinge pin 97.
One end is pivotally connected. The other end of the lever 99 is appropriately pivotally connected to one end of a slide rod 103 of an angle adjustment cylinder 101 mounted on the front plate 11.

The angle adjustment cylinder 101 functions to control the inclination angle of the ram 25 and adjust the inclination angle (shear angle) of the upper blade 27 with respect to the lower blade 15.
Its configuration is as schematically shown in FIG. That is, in the cylinder body 105 of the angle adjustment cylinder 101, there is a piston 109 integrally provided with a hollow piston rod 107.
is slidably inserted. The slide rod 103 protrudes in a direction opposite to the direction in which the piston rod 107 protrudes from the cylinder body 105.
The base of the piston rod 107 is slidably fitted into the hollow part of the piston rod 107. The fitted state of the piston rod 107 and the slide rod 103 is such that when the slide rod 103 slides to the left in FIG. It is constructed so that it can slide.

One end of a suitable connecting body 111 such as a wire, chain, etc. is connected to the tip of the piston rod 107. This connecting body 111 includes a rotary wheel 113 rotatably supported on the front plate 11, and a ram 25 spaced apart from side to side and at the same height position.
Rotating wheels 115 and 117 rotatably supported on the front plate 11 and rotating wheels 1 rotatably supported on the front plate 11.
19, as shown in FIGS. 1 and 5, and a control cam 121 (see FIG. 5) is attached near the other end. A spring seat 123 is attached to the other end of the connecting body 111, and an ammunition 127 is loaded between this spring seat 123 and a spring seat 125 attached to the front plate 11.
Therefore, the connecting body 111 is constantly pulled by the ammunition 127.

First and second cylinder control valves 129 and 131 for controlling the supply of pressure oil to the left and right drive cylinders 17 and 19 are arranged on both sides of the cam 121. The first cylinder control valve 129, when actuated by engagement with the control cam 121, drains the pilot pressure of the first pilot operating valve 133, which controls the operation of the right drive cylinder 19, to The pilot operating valve 133 is opened to allow pressure oil to flow from the rod side of the right drive cylinder 19 to the head side. Further, when the first cylinder control valve 129 is disengaged from the control cam 121, the first cylinder control valve 129
It functions to release the pilot pressure drain of the pilot operating valve 133 and bring it into a closed state, thereby preventing pressure oil from flowing from the rod side to the head side of the right drive cylinder 19. The second cylinder control valve 131 controls the operation of the left drive cylinder 17 when the second cylinder control valve 131 is operated by engagement with the control cam 121.
Drain the pilot pressure of 35 and control cam 12.
1, the drain of the pilot pressure of the second pilot operating valve 135 is released.

As described above, when the control cam 121 engages with the first cylinder control valve 129, pressure oil is supplied to the head side due to the difference in pressure receiving area between the head side and the rod side of the right drive cylinder 19. Piston 19 will be lowered.
Therefore, only the right side of the ram 25 is lowered in FIGS. 1 and 5, and only the right side of the ram 25 is lowered when the control cam 121 and the first cylinder control valve 129 are disengaged. The descent will be stopped. That is, the control cam 121
By appropriately controlling the engagement between the upper blade 27 and the first cylinder control valve 129, the upper blade 27
The inclination angle (shear angle) can be adjusted.

Therefore, as described above, when pressure oil is supplied to the detection actuation cylinder 85 and the connecting rod 83 is pulled to the right in FIGS. 1 and 5 to lower the detection member 81 in the detection device, the rod 99 is the first
In FIG. 5, it is rotated counterclockwise. Therefore, the connecting body 111 is pulled against the bomb 127 via the slide rod 103 and piston rod 107 of the angle adjustment cylinder 101. That is, the control cam 121 is moved to the left in FIG. 5 and engages with the first cylinder control valve 129. Therefore, as described above, pressure oil is supplied to the right drive cylinder 19, only the right side of the ram 25 is lowered, and the shear angle of the upper blade 27 with respect to the lower blade 15 is controlled. As mentioned above, the control cam 12
The amount of movement of 1 by the connecting body 111 is
This corresponds to the amount of descent of the detection member 81. In other words, the amount of movement of the control cam 121 corresponds to the thickness of the workpiece W detected by the detection member 81.

Note that when the ram 25 operates downward to the right in FIG. 1 and FIG.
is pulled by the bomb 127 and leaves the first cylinder control valve 129. That is, at the position where the control cam 121 is disengaged from the first cylinder control valve 129, the rightward downward movement of the ram 25 is stopped, and the shear angle is set in accordance with the thickness of the workpiece W. be.

Next, the hydraulic circuit configuration for the left and right drive cylinders 17, 19, actuation cylinder 49, detection actuation cylinder 85, etc. will be explained.

As shown in FIG. 5, a filter F for filtering oil from a tank T is connected to a hydraulic pump P driven by a motor M. Hydraulic pump P
A relief valve 139 is connected to the main circuit 137 from the main circuit 137 . The main circuit 137 includes the first branch circuit 1
41 and a second branch circuit 143. The first branch circuit 141 is connected to the head side of the right drive cylinder 19, and a third pilot operating valve 145 is interposed between the first branch circuit 141 and the main circuit 137. . In addition, the first
A drain circuit 147 branched from the branch circuit 141 and connected to the tank T has a fourth pilot operating valve 1.
49 are arranged.

The second branch circuit 143 is an accumulator.
This second branch circuit 143 is connected to the ACC, and a fifth pilot operating valve 151 and a check valve 153 are arranged in this order from the hydraulic pump P side. Further, relief valves 155 and 157 are branched and connected to the second branch circuit 143, and a pressure gauge 161 is branched and connected via a manually operated valve 159.

The third, fourth, and fifth pilot operating valves 145, 149, and 151 open the circuit when the pilot pressure in the pilot oil passages connected to them are drained, and open the circuit when the pilot pressure is acting. It acts to close the . The pilot oil passage 163 of the third pilot operating valve 145 is connected to the first branch circuit 141 via the first shuttle valve 165, and is connected to the first branch circuit 141 via the first shuttle valve 165.
It is connected to the main circuit 137 via a 4-port, 2-position first solenoid valve 167 and a second shuttle valve 169 equipped with a solenoid SOL1. The pilot oil passage 171 of the fourth pilot operating valve 149 is connected to the second
It is connected between the first solenoid valve 167 and the second shuttle valve 169 via a 4-port, 2-position second solenoid valve 173 equipped with a solenoid SOL2. Pilot oil passage 17 of the fifth pilot operating valve 151
5 is connected to the first electromagnetic valve 167. Therefore, by appropriately operating the first solenoid valve 167 and the second solenoid valve 173, each pilot oil passage 1 can be opened.
63, 171 and 175 can be appropriately controlled, and each pilot operating valve 145, 149, 15
1 can be controlled to open and close.

The first branch circuit 141 is connected to the head side of the right drive cylinder 19 and connects to the connecting oil passage 1 in which the first pilot operating valve 133 is arranged.
75 to the rod side of the right drive cylinder 19 and the head side of the left drive cylinder 17. The connecting oil passage 175 is connected to a branch connecting oil passage 177 branched from the second branch circuit 143 via the second pilot operating valve 135. The above-mentioned control valve 55 is connected to this branch connection oil passage 177.
are connected in a branched manner, and a connection path 179 connected to the rod side of the actuating cylinder 49 is also connected in a branched manner. In addition to the control valve 55, the head side of the operating cylinder 49 is connected to the tank T via a third solenoid valve 181 equipped with a third solenoid SOL3. Furthermore, the branch connection oil passage 177 is connected to the rod side of the left drive cylinder 17 via a sixth pilot operating valve 183.

The third shuttle valve 185 that controls the pilot pressure of the first pilot operating valve 133 is connected to the first branch circuit 141, the connecting oil passage 175, and the first cylinder control valve 129. The fourth shuttle valve 187 that controls the pilot pressure of the second pilot operation valve 135 is connected to the second cylinder control valve 131, the connecting oil passage 175 and the branch connecting oil passage 1.
It is connected to 77. 6th pilot operation valve 18
No. 3 pilot oil passage 191 is connected to the fourth solenoid.
4th solenoid valve 1 with 4 ports 2 positions with SOL4
It is connected to the connection oil passage 177 via 89.

An operating circuit 193 for operating the plate holding device 67 and the detection operating cylinder 85 is branched from the second branch circuit 143, and this operating circuit 193 includes a check valve 195, a fifth solenoid SOL5, and a sixth solenoid SOL5. 4 with SOL6
Fifth solenoid valves 197 at the port 3 position are sequentially arranged. A first branch circuit 141 is connected to this operating circuit 193 via a sequence valve 199 and a check valve 201. Note that the fifth solenoid valve 1
Since the back gauge device 203 connected to 97 may have a normal configuration, a detailed explanation thereof will be omitted.

A sixth solenoid valve 205 equipped with a seventh solenoid SOL7 is connected to the angle adjustment cylinder 101.

Now, in the above configuration, table 1
When an appropriate switch such as a foot switch is operated to shear the workpiece W placed on the upper blade 27 and the lower blade 15, the first solenoid SOL1 of the first solenoid valve 167 and the solenoid SOL1 of the second solenoid valve 173 are activated. The second solenoid SOL2, the fourth solenoid SOL4 of the fourth solenoid valve 189, and the fifth solenoid SOL5 of the fifth solenoid valve 197 are each excited, and each solenoid valve is switched from the state shown in FIG. Therefore, the third
The pilot pressure in the pilot operating valve 155 is drained to open the valve, and the fourth and fifth pilot operating valves 149 and 151 are applied with pilot pressure to close the valve. Therefore, the pressure oil from the hydraulic pump P is supplied to the head side of the right drive cylinder 19 via the first branch circuit 141, and
Through the sequence valve 199 and check valve 201, the plate holding device 67 and the detection operation cylinder 85 are connected.
supplied to

As described above, when the fifth solenoid SOL5 is excited and the fifth solenoid valve 197 is switched, the pressure oil in the accumulator ACC is transferred to the second branch circuit 14.
3. The plate holding device 67 and the detection actuation cylinder 85 via the fifth solenoid valve 197 and the actuation circuit 193
It will be supplied to Therefore, the pressing pad 73 of the plate holding device 67 is lowered to press and fix the workpiece W to the table 13, and the detection operation cylinder 85 is activated to move the connecting rod 83 as shown in FIG.
5, the detection member 81 follows the pressing pad 73 and descends.

When the connecting rod 83 is pulled to the right in FIGS. 1 and 5 as described above, the cam 59 is pulled as described above.
engages control valve 55 and actuating cylinder 49
is activated, and the clearance adjustment corresponding to the thickness of the workpiece W is automatically performed. Similarly, as described above, the control cam 121 is engaged with the first cylinder control valve 129, and the shear angle is automatically set according to the thickness of the workpiece W. That is, the control cam 121 is connected to the first cylinder control valve 12.
9 and switches, the pilot pressure in the first pilot operating valve 133 is drained and the valve is opened, so that the pressure oil from the first branch circuit 141 acts on the head side and rod side of the right drive cylinder 19. As a result, oil is discharged from the rod side due to the difference in pressure receiving area and is returned to the head side, operating the right drive cylinder 19 and lowering the right side of the ram 25.

Note that after setting the shear angle appropriately, when the seventh solenoid SOL7 of the sixth solenoid valve 205 is energized to switch the sixth solenoid valve 205, the angle adjustment cylinder 101 becomes locked, and the piston 109 and piston rod 107 is fixed. Therefore, the slide rod 103 simply slides with respect to the piston rod 107, and the interlocking movement of the connecting body 111 is stopped with respect to the operation of the connecting rod 83, so that the shear angle is set constant. It is what it is.

As described above, the distance between the upper blade 27 and the lower blade 15 is adjusted according to the thickness of the workpiece W, and the inclination angle (shear angle) of the upper blade 27 with respect to the lower blade 15 is automatically set. After that, the oil on the rod side discharged by the pressure applied to the head side of the right drive cylinder 19 is transferred to the left drive cylinder 17.
flows into the head side. Therefore, the oil on the rod side of the left drive cylinder 17 is discharged and pressure is accumulated in the accumulator ACC. That is, the ram 25 is lowered and the workpiece W is sheared by the lower blade 15 and the upper blade 27. Note that when the ram 25 is lowered, if there is a delay on one side of the ram 25 on the right or left side and the inclination of the ram 25 deviates from the set shear angle, the control cam 121 moves the first and second cylinders. control valve 12
9 and 131 as appropriate to correct the delay.

After the workpiece W is sheared by the lower blade 15 and the upper blade 27 as described above, the first solenoid SOL1,
2nd solenoid SOL2 and 5th solenoid
When SOL5 is demagnetized, the first solenoid valve 167 and the second
The solenoid valve 173 and the fifth solenoid valve 197 return to the state shown in FIG. Therefore, the plate holding device 6
7. The oil in the detection cylinder 85 will be discharged, and the plate holding device 67, detection member 81, etc. will be returned to their original positions. Note that when returning the detection member 81 and the like to their original positions, the third solenoid SOL3 of the third solenoid valve 181 is brought into an excited state.

As mentioned above, the first and second solenoid valves 167,1
73 has returned to the state shown in Figure 5,
The oil on the head side of the right drive cylinder 19 is discharged to the tank T via the fourth pilot operating valve 149. On the other hand, the pressure oil from the hydraulic pump P is supplied to the fifth pilot operating valve 151 and the second branch circuit 1.
43, the branch connection oil passage 177, and the sixth pilot operating valve 183, and then flows into the rod side of the left drive cylinder 17. The oil on the head side of the left drive cylinder 17 flows into the rod side of the right drive cylinder 19. Therefore, the ram 25 will be raised and returned. After the ram 25 is raised back up, the third, fourth and seventh solenoids SOL
3. By demagnetizing SOL4 and SOL7,
This is the initial state.

The present invention provides a detection device for detecting the thickness of a plate-shaped workpiece placed on a table in a shearing machine, and an upper blade mounted on a ram that is movable up and down relative to a lower blade of the shearing machine. Since the inclination angle of the blade is freely adjustable and a control device is provided to control the inclination angle of the upper blade according to the amount detected by the detection device, the shear angle can be automatically adjusted according to the thickness of the workpiece. It can be adjusted to Therefore, even when the thickness of the workpiece changes, the shearing operation is easy, and it is highly effective in automating the shearing machine.

It should be noted that the present invention is not limited to the above-described embodiments, but can be implemented in various other embodiments by appropriate design modifications. For example, the thickness of a workpiece can be detected magnetically, electrically, or mechanically by clamping a part of the workpiece from both sides, and the detection signal is, for example, an electrical or hydraulic pressure signal. It is also possible to have a configuration in which the shear angle adjustment device is controlled by a signal for this extraction.

[Brief explanation of drawings]

Fig. 1 is an explanatory front view of the shearing machine with the front plate omitted, Fig. 2 is an explanatory cross-sectional view along the - line in Fig. 1, and Fig. 3 is an enlarged view along the - line in Fig. 1. FIG. 4 is a sectional view taken along the - line, and FIG. 5 is an explanatory view of the hydraulic circuit. (Explanatory diagram of the symbols representing the main parts of the drawing),
13...Table, 15...Lower blade, 17, 19...
... Drive cylinder, 25 ... Ram, 27 ... Upper blade, 81 ... Detection member, 121 ... Control cam, 1
29,131...Cylinder control valve.

Claims (1)

[Claims] 1 A detection device is installed to detect the thickness of a plate-shaped workpiece placed on a table in a shearing machine, and an inclination of an upper blade attached to a ram that is movable up and down relative to a lower blade equipped with a shearing machine is provided. A shearing machine characterized in that the angle is adjustable and a control device is provided for controlling the inclination angle of the upper blade according to the amount detected by the detection device.