JP2000317726A - Shearing work method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a shearing ratio by automatically regulating inversion timing for a ram direct after the collection of cutting regardless of the plate thickness and cutting position of a workpiece. SOLUTION: A back gauge device 27 for positioning a cutting length is provided on a shearing device 1. Since the device 27 and a lower blade 7 are electrically connected to a current detection device 41 via a connecting wire 43, the striking of a workpiece W against the device 27 carries a current between the blade 7 and the device 27 via the workpiece W. When this current- carrying is detected by the device 41, a command that an upper blade 23 be lowerd is imparted from a control device 37, and the workpiece W is cut, the current-carrying is cut off, so that the shearing work is judged to be finished and a command that the blade 23 be immediately raised is given to a hydraulic cylinder 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for shearing.

[0002]

2. Description of the Related Art Conventionally, in a shearing machine such as a shearing machine 101, as shown in FIG. 3, an upper blade 105 is mounted on a ram 103 which can be moved up and down by a hydraulic cylinder. A lower blade 107 that works to shear the plate-shaped workpiece W is provided on a shoulder of the lower frame 109 on the rear side (rightward in FIG. 3) of the table 111.

Further, a back gauge device 113 is provided at the rear side of the shear line between the upper blade 105 and the lower blade 107 to abut one end of the work W to determine the cutting length.

The shearing machine 101 has an upper limit LS115 (limit switch) for detecting the upper limit of the ram 103 and a lower limit LS117 (limit switch) for detecting the lower limit of the ram 103.
Alternatively, after a lapse of a set time from the detection of the start of lowering of the ram 103 by the upper limit LS115,
Is provided with a timer (not shown) that reverses and rises.

[0005]

By the way, in the conventional shearing machine 101, when the upper blade 105 moves up and down from the upper limit to the lower limit to perform the cutting process, the workpiece W is cut short, long, or long. There is a problem in that the cutting time is the same regardless of whether the thickness is large or thin, so that there is a lot of extra movement and the cutting rate is not improved.

In the case of the shearing machine 101 provided with a timer as in the latter case, there is a problem that the setting time of the timer needs to be adjusted according to the conditions such as the thickness of the work W and the cutting position, which is troublesome. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to automatically perform timing of reversing a ram immediately after completion of cutting, irrespective of the thickness of the work and the cutting position, thereby performing cutting processing. It is an object of the present invention to provide a shearing method and a device capable of improving the rate.

[0008]

According to a first aspect of the present invention, there is provided a shearing method of the present invention, wherein at least one of an upper blade and a lower blade for cooperatively shearing a workpiece is vertically movable. In a shearing processing device provided with a back gage device that abuts one end of the work on the rear side of the shear line of the upper blade and the lower blade to determine the cutting length, the work is hit against the back gage device. When the back gauge device and the upper blade or the lower blade are electrically connected to each other by a current detecting device that is electrically connected by a connection line, the operation of the upper blade or the lower blade that can move up and down is started. The operation of the upper blade or the lower blade is reversed when the current detection device detects that the energization is OFF.

Therefore, when the work is abutted against the back gauge device, electricity is supplied through the work between the upper blade or lower blade connected to the current detecting device and the back gauge device, but the work is cut off. As a result, the energization is interrupted. As soon as the work is cut, the upper blade is reversed from the lowering operation to the ascending operation, so the upper blade is automatically moved with the shortest stroke according to the work regardless of the thickness of the work or the cutting position. The cutting efficiency is improved.

In the case of a lower blade that can move up and down, the lower blade is immediately inverted from a rising operation to a lowering operation when the work is cut.

According to a second aspect of the present invention, at least one of an upper blade and a lower blade for cooperatively shearing a work is provided so as to be vertically movable, and a shear line between the upper blade and the lower blade is formed. In a shearing device provided with a back gauge device for positioning a cutting length by abutting one end of a work on a rear side, an upper limit detecting device that detects an upper limit of a stroke of an upper blade or a lower blade that can move up and down, A lower limit detecting device for detecting a lower limit of the stroke of the upper blade or the lower blade is provided, and the back gauge device and the upper blade or the lower blade are electrically connected with a connecting line, and a current detecting device is provided on the connecting line. When the workpiece is hit against the back gauge device and current is detected by the current detecting device, a command to start operation of the upper blade or the lower blade that can move up and down is given, and the current detecting device detects OFF of the current. It is characterized in that formed by providing a control device for providing an inverted allowed to command the operation of the upper blade or the lower blade when the.

Therefore, when the work is hit against the back gauge device, the work is interposed between the upper blade or the lower blade connected to the current detecting device and the back gauge device. When the work is cut, the current is cut off. As soon as the work is cut, the upper blade is reversed from the lowering operation to the ascending operation, so the upper blade is automatically moved with the shortest stroke according to the work regardless of the thickness of the work or the cutting position. The cutting efficiency is improved.

In the case of a lower blade that can move up and down, the lower blade is immediately inverted from a rising operation to a lowering operation when the work is cut.

According to a third aspect of the present invention, in the shearing apparatus according to the second aspect, the control device detects that the lower limit of the upper blade that can move up and down is reached by the lower limit detecting device. And an alarm device for notifying an operator when the current is detected by the current detection device.

Therefore, for example, when a product is pinched between the lower blade and the back gauge device as a trouble during the cutting process, the lower limit of the upper blade that can move up and down is detected by the lower limit detecting device, and the cutting is completed. Also, the current detection device detects the energization. At this time, a command is given from the control device to the alarm device, and an alarm is sounded, so that the trouble is reliably dealt with.

According to a fourth aspect of the present invention, in the shearing apparatus according to the second aspect, the control device detects that the lower blade, which can move vertically, has reached the upper limit by the upper limit detecting device. And an alarm device for notifying an operator when the current is detected by the current detection device.

Therefore, for example, when a product is caught between the lower blade and the back gauge device as a trouble during the cutting process, the upper limit of the vertically movable lower blade is detected by the upper limit detecting device, and the cutting is completed. Also, the current detection device detects the energization. At this time, a command is given from the control device to the alarm device, and an alarm is sounded, so that the trouble is reliably dealt with.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a shearing apparatus according to the present invention will be described below with reference to the drawings, taking a general shearing machine as an example.

Referring to FIG. 1, for example, a shearing machine 1 as a shearing device according to the present embodiment is a shearing device called a guillotine type in detail, and is provided in front of a lower frame 3 (left side in FIG. 1). Is provided with a table 5, and a lower blade 7 is provided at a rear shoulder of the table 5. A gap 9 is formed in the lower frame 3 behind the lower blade 7.

On the table 5 is shown a plate-like work W projecting from the lower blade 7 to the gap portion 9, and the work W is provided on a front plate provided on the front side of the upper frame 11. The plate 5 is pressed and fixed to the table 5 by a plate presser 15 provided so as to be able to move up and down from 13.

A hydraulic cylinder 17 as a fluid pressure cylinder, for example, is provided near the both ends in the longitudinal direction of the shearing machine 1 in front of the upper frame 11.
9 is driven up and down by the hydraulic cylinder 17.

The ram 19 is guided by a guide plate (not shown), and moves up and down while being held by a guide roller 21. An upper blade 23 is attached to the lower end of the ram 19 on the front side.

The ram 19 is appropriately provided with a horizontal reinforcing plate 25 and a vertical reinforcing plate (not shown). Further, a back gauge device 27 for improving the work efficiency by abutting one end of the work W on the gap portion 9 behind the lower blade 7 is provided.

A product box 29 for storing a product is placed below the lower blade 7.

Next, the main part of the embodiment of the present invention will be described in detail.

Referring to FIG. 1, behind the ram 19, for example, an upper limit detecting device LS33 (limit switch) as an upper limit detecting device for detecting the upper limit of the stroke of the upper blade 23 via the bracket 31 on the upper frame 11, For example, a lower limit detection LS35 (limit switch) is provided as a lower limit detection device that detects the lower limit of the stroke of the lower blade 7, and each of the detection LSs 33 and 35 is electrically connected to a control device 37 described later. The ram 19 is provided with a dog 39 for turning ON / OFF the upper limit detection LS33 and the lower limit detection LS35.

The lower frame 3 and the back gauge device 27, which are electrically connected to the lower blade 7, are electrically connected to a current detecting device 41 for detecting whether or not current is supplied through a connection line 43. The detection device 41 is electrically connected to a control device 37 to be described later to send a detection signal of energization.

The control device 37 includes, for example, an input device 47 and a display device 49 for inputting data such as a machining program to a CPU 45 as a central processing device, a memory 51 for storing the input data, and a work W In response to an energization detection signal from the current detection device 41 generated by being hit by the device 27, a command to start operation is given to the hydraulic cylinder 17 so as to start lowering the ram 19, and the current detection device 41 turns off the energization. Is provided to the hydraulic cylinder 17 so as to raise the ram 19 as soon as it is detected, that is, a command to immediately reverse the operation of the ram 19 to the hydraulic cylinder 17.

The command unit 53 of the control device 37 is electrically connected to, for example, an alarm 55 as an alarm device for notifying the operator of a failure.

With the above configuration, as shown in FIG. 2, the work W is placed on the table 5 and the back gauge device 27
, The back gauge device 27 and the lower blade 7 are conducted through the work W, so that the current is detected by the current detection device 41 (step S1).

An operation command for starting the lowering of the hydraulic cylinder 17 is given from the commanding unit 53 of the control device 37 by the energization detection signal of the current detecting device 41, and the ram 19 starts lowering.
That is, the upper blade 23 is lowered, and the upper limit detection LS33 is turned off (step S2).

When the work W is cut, the product is dropped and stored in the lower product box 29, and the conduction between the back gauge device 27 and the lower blade 7 is turned off. Accordingly, in the current detection device 41, the above-described energization is turned off, and the command unit 53 of the control device 37 determines that the cutting process is completed, and gives a command to the hydraulic cylinder 17 to immediately raise the ram 19 ( Steps S3 and S
4).

When the upper blade 23 rises and the upper limit detection LS 33 becomes O
N, the upper blade 23 stops at the upper limit position (step S
5 and S6).

As described above, the above steps S1 to S6
Is repeated to perform the cutting process. At this time,
As soon as the work W is cut, regardless of the thickness of the work W and the cutting position, the upper blade 23 is reversed from the lowering operation to the ascending operation, so that the upper blade 23 automatically has the shortest stroke corresponding to the work W. , The cutting efficiency can be improved.

In the state where the product is sandwiched between the lower blade 7 and the back gauge device 27 despite the completion of the cutting of the work W by the above cutting process, the back gauge device 2
The conduction between the lower blade 7 and the lower blade 7 does not turn off but remains on.

Therefore, when the current detection device 41 detects the energization and the lower limit detection LS35 is ON, it is determined that the product is sandwiched between the lower blade 7 and the back gauge device 27. Thus, a command to stop the operation of the hydraulic cylinder 17 is given from the command unit 53 of the control device 37, and at the same time, a command to sound an alarm is given to the alarm 55 (steps S7 to S9). Therefore, a trouble at the time of cutting is reliably detected and reported to the operator.

The present invention is not limited to the above-described embodiment of the present invention, but can be embodied in other forms by making appropriate changes. In the present embodiment, the shearing machine 1 in which the upper blade moves up and down is described as an example of the shearing device. However, a shearing machine in which at least one of the upper blade and the lower blade is provided so as to be vertically movable may be used.

For example, in a shearing machine in which the lower blade 7 moves up and down, a ram that moves the lower blade 7 up and down is provided on the lower frame 3, and this ram has an upper limit detection LS as an upper limit detecting device as described above. And a lower limit detection LS as a lower limit detection device. In this case, since the cutting process is started when the ram rises from the lower limit, the functions of the upper limit detection LS and the lower limit detection LS are opposite to those of the above-described shearing machine 1 of FIG. Therefore, the command unit 5
Reference numeral 3 indicates that an alarm signal is sent to the alarm device when current detection is performed by the current detection device 41 despite detection of the upper limit of the vertically movable lower blade 7 by the upper limit detection LS.

The embodiment of the present invention is also applied to a shearing machine in which both the upper blade 23 and the lower blade 7 move up and down.

[0040]

As will be understood from the above description of the embodiments of the present invention, according to the first aspect of the present invention, when the workpiece is hit against the back gauge device, the workpiece is connected to the current detecting device. Electric power is supplied between the blade or lower blade and the back gauge device via the work, but when the work is cut, the electric power is cut off. Therefore, the upper blade can be immediately reversed from the descending operation to the ascending operation immediately after the work is cut, regardless of the thickness of the work or the cutting position, so that the upper blade can be automatically moved with the shortest stroke according to the work, Cutting efficiency can be improved.

If the lower blade can be moved up and down, the lower blade can be reversed from the raising operation to the lowering operation immediately when the work is cut.

According to the second aspect of the present invention, it is the same as the effect of the first aspect, and when the workpiece is hit against the back gauge device, the upper blade or the lower blade connected to the current detecting device and the back gauge device are connected. During the operation, power is supplied through the work, but when the work is cut, the power supply is cut off. Therefore, the upper blade can be immediately reversed from the descending operation to the ascending operation immediately after the work is cut, regardless of the thickness of the work or the cutting position, so that the upper blade can be automatically moved with the shortest stroke according to the work, Cutting efficiency can be improved.

If the lower blade can be moved up and down, the lower blade can be reversed from the ascending operation to the descending operation immediately after the work is cut.

According to the third aspect of the present invention, when a product is caught between the lower blade and the back gauge device as a trouble at the time of cutting processing, the lower limit of the upper blade which can move up and down can be detected by the lower limit detecting device. Even when the disconnection is completed, the current detection device can detect the energization, so that a command is given from the control device to sound the alarm device, so that the trouble can be surely dealt with.

According to the fourth aspect of the invention, when a product is caught between the lower blade and the back gauge device as a trouble at the time of the cutting process, the upper limit detection of the lower blade which can move up and down is performed. Even when the disconnection is completed, the current detection device can detect the energization, so that a command is given from the control device to sound the alarm device, so that the trouble can be surely dealt with.

[Brief description of the drawings]

FIG. 1 is an overall schematic explanatory view showing a shearing machine and a control device according to an embodiment of the present invention.

FIG. 2 is a flowchart of a shearing method according to the embodiment of the present invention.

FIG. 3 is a partial schematic explanatory view of a conventional shearing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shearing machine (shearing machine) 5 Table 7 Lower blade 17 Hydraulic cylinder (fluid pressure cylinder) 19 Ram 23 Upper blade 27 Back gauge device 33 Upper limit detection LS (Upper limit detection device) 35 Lower limit detection LS (Lower limit detection device) 37 Control Device 39 Dog 41 Current detection device 43 Connection line 53 Command unit 55 Alarm (alarm device)

Claims (4)

[Claims] At least one of an upper blade and a lower blade for cooperatively shearing a work is provided so as to be movable up and down, and one end of the work is brought into contact with a rear side of a shear line between the upper blade and the lower blade. In a shearing device provided with a back gauge device for positioning a cutting length, when a work is hit against the back gauge device, the back gauge device and the upper blade or the lower blade are electrically connected with a connection line. When the energization is detected by the connected current detection device, the operation of the upper blade or the lower blade that can move up and down is started, and when the energization OFF is detected by the current detection device, the operation of the upper blade or the lower blade is performed. A shearing method characterized by reversing the above. 2. At least one of an upper blade and a lower blade cooperatively shearing a work is provided so as to be vertically movable, and one end of the work is abutted on a rear side of a shear line between the upper blade and the lower blade. In a shearing device provided with a back gauge device for positioning the cutting length, an upper limit detecting device that detects an upper limit of a stroke of an upper blade or a lower blade that can move vertically, and a lower limit of a stroke of the upper blade or the lower blade. A lower limit detection device for detecting is provided, and the back gauge device and the upper blade or the lower blade are electrically connected with a connection line, and a current detection device is provided on the connection line, and the workpiece is hit against the back gage device. When the current detection device detects the energization, a command to start the operation of the upper blade or the lower blade that can move up and down is given, and when the current detection device detects the energization OFF, the operation of the upper blade or the lower blade is performed. Flip Shearing apparatus characterized by comprising a control device is provided that gives occupies command. 3. An alarm device for notifying an operator when the current detecting device detects energization despite detecting that the lower blade has reached the lower limit of the vertically movable upper blade by the lower limit detecting device. 3. The shearing device according to claim 2, wherein 4. An alarm device for notifying an operator when a current detection device detects energization even though the control device detects that the upper blade of the vertically movable lower blade has reached an upper limit. 3. The shearing device according to claim 2, wherein