JP2005001062A - Machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machine tool which surely detects whether a workpiece is cut without putting large restrictions on layout. <P>SOLUTION: After cutting the workpiece W by a cutting-off tool 32 in the machine tool 1, a second spindle is rotated and driven at low speed in a state of rotating and driving being stopped in relation to a first spindle. At that time, if the first spindle 10 does not follow rotation of the second spindle 20 in a detection result of a following detecting mechanism 5, a complete cutting of the workpiece W is detected. The following detecting mechanism 5 detects that the workpiece W is not completely cut if the first spindle 10 follows rotation of the second spindle 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a machine tool. More specifically, the present invention relates to a technique for detecting whether or not cutting of a workpiece is completed as planned when cutting a workpiece held between spindles.
[0002]
[Prior art]
In a machine tool in which the first spindle and the second spindle are arranged to face each other, after processing the workpiece held on the first spindle, the end portion of the workpiece is held by the second spindle. While rotating the workpiece with, cut off the workpiece with a parting tool. After that, the second spindle moves to a place where the unloading apparatus is waiting, or the unloading apparatus approaches the second spindle, and the separated processed workpiece is discharged.
[0003]
[Problems to be solved by the invention]
In such a machine tool, when the workpiece is discharged even though the workpiece is not completely cut, not only the workpiece is damaged, but also the first spindle or the second spindle is damaged. There is a problem that an excessive force is applied and the machine tool itself is damaged. Therefore, it is sufficient to provide a mechanism for detecting whether or not the workpiece has been cut as planned. However, for example, even when monitoring the cutting position of the workpiece with a camera, the workpiece is apparently connected, so it is impossible. It is. In addition, even if it is attempted to detect whether or not the workpiece is electrically conductive, such detection is not possible if the workpiece is in contact at the cutting location. In addition, in any of the above two detection methods, the detection mechanism must be arranged in the cutting zone, and there is a problem that the layout of the machine tool is greatly restricted.
[0004]
In view of the above problems, an object of the present invention is to provide a machine tool that can reliably detect whether or not a workpiece has been cut without significantly restricting the layout.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, in the present invention, a first spindle, a second spindle disposed opposite to the first spindle, and a holding between the first spindle and the second spindle are held. In a machine tool having a tool that cuts the workpiece, the other of the first spindle and the second spindle in a state in which the rotational drive of one of the first spindle and the second spindle is stopped after cutting the workpiece. And a driven detection means for detecting whether or not the one spindle is driven by the rotation of the other spindle.
[0006]
In the present invention, after the work held between the first spindle and the second spindle is cut, the rotation of one of the first spindle and the second spindle is stopped and the other spindle is stopped. Drive. The driven detection means detects whether one spindle is driven by the rotation of the other spindle. Here, if one of the spindles is not driven, it can be reliably detected that the workpiece has been completely cut. If one of the spindles is driven, the cutting of the workpiece is incomplete and still connected. This can be reliably detected. Accordingly, it is possible to avoid that the work discharging operation is performed even though the work is not completely cut, so that damage to the work and further damage to the spindle can be prevented. Further, in the present invention, it is only necessary to monitor the follower of one of the spindles instead of directly monitoring the cutting of the workpiece. Therefore, the follower detecting means does not need to be arranged in the cutting zone and greatly restricts the layout. There is nothing.
[0007]
In the present invention, for example, the driven detection means may determine whether the one spindle is driven in the vicinity of the base end portion on the opposite side to the side having the chucking device that holds the workpiece among both ends of the one spindle. It is preferable to detect whether or not.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
A machine tool to which the present invention is applied will be described below with reference to the drawings.
[0009]
1A to 1D are explanatory views of a machine tool to which the present invention is applied.
[0010]
In FIG. 1A, the machine tool 1 of the present invention has a first spindle 10 and a second spindle 20 disposed opposite to the first spindle 10. , And the second spindle 20 are provided with chucking devices 11, 21 at opposing positions, respectively. A pulley 17 to which the rotation of the first drive motor 15 is transmitted via a belt 16 to the end of the first spindle 10 opposite to the side where the chucking device 11 is configured. This pulley 17 can rotate integrally with the first spindle 10. A second drive motor 25 that rotationally drives the second spindle 20 is disposed in the vicinity of the end opposite to the side where the chucking device 21 is configured, of both ends of the second spindle 20. ing.
[0011]
In the machine tool 1 of the present embodiment, a cutting zone 2 is provided between the first spindle 10 and the second spindle 20, and the cutting zone 2 includes a tool 31 for performing various types of processing, and a parting-off. Byte 32 appears.
[0012]
Although not shown, the machine tool 1 includes a loading device that supplies unprocessed workpieces W to the first spindle 10 and an unloading device that receives processed workpieces W from the second spindle 20. It is configured.
[0013]
Further, in the machine tool 1 of the present embodiment, the first spindle 10 to be described later is driven in the vicinity of the base end portion 19 on the opposite side of the both ends of the first spindle 10 from the side having the chucking device 11. A driven detection mechanism 5 for detecting is configured. In this embodiment, a proximity sensor that can detect the rotation of the pulley 17 magnetically, mechanically, or optically is used as the driven detection mechanism 5.
[0014]
In the machine tool 1 configured as described above, first, an unmachined workpiece W is held on the first spindle 10. Next, the first spindle 10 rotates around the axis to rotate the workpiece W, and the tool 31 performs predetermined processing on the rotating workpiece W.
[0015]
After this processing is completed, the second spindle 20 holds the end portion of the workpiece W as shown in FIG. As a result, the workpiece W is held between the first spindle 10 and the second spindle 20.
[0016]
In this state, the first spindle 10 and the second spindle 20 rotate the workpiece W around the axis, and the parting tool 32 cuts the workpiece W.
[0017]
Next, the second spindle 20 is rotationally driven at a low speed while the rotational driving for the first spindle 10 is stopped. At that time, the driven detection mechanism 5 monitors whether or not the rotation of the second spindle 20 is transmitted to the first spindle 10 via the workpiece W. That is, the proximity sensor of the driven detection mechanism 5 detects the rotation of the pulley 17 connected to the first spindle 10.
[0018]
In the detection result, as shown in FIG. 1C, if the first spindle 10 does not follow the rotation of the second spindle 20, it can be detected that the workpiece W is completely cut. Therefore, in this case, the second spindle 20 moves to a place where the unloading apparatus is waiting, or the unloaded apparatus approaches the second spindle 20 and is separated and has been processed. Is discharged.
[0019]
On the other hand, as shown in FIG. 1D, if the first spindle 10 is driven by the rotation of the second spindle 20, it can be detected that the workpiece W is not completely cut. Therefore, in this case, processing such as cutting the workpiece W with a parting tool may be performed again without discharging the processed workpiece W.
[0020]
Thus, in the machine tool 1 of this embodiment, the workpiece W is completely cut only by detecting whether or not the first spindle 10 is driven by the rotation of the second spindle 20 by the driven detection mechanism 5. It is possible to reliably detect whether it has been broken. Accordingly, it is possible to avoid that the work W is discharged even though the work W is not completely cut, so that damage to the work W and further damage to the spindle can be prevented.
[0021]
In the present embodiment, since the cutting of the workpiece W is not directly monitored, it is only necessary to monitor the follower of the first spindle 10, so the follower detection mechanism 5 does not need to be disposed in the cutting zone 2, and Since it may be arranged at the base end portion 19 of the single spindle 10 or the like, the layout of the machine tool 1 is not greatly restricted.
[0022]
(Other embodiments)
The second spindle 20 is driven to rotate at a low speed while the rotational drive for the first spindle 10 is stopped, and the follow-up of the first spindle 10 is monitored. However, the rotational drive for the second spindle 20 is stopped. Thus, the follower of the second spindle 20 may be monitored by rotating the first spindle 10 at a low speed.
[0023]
【The invention's effect】
As described above, in the present invention, after the work held between the first spindle and the second spindle is cut, the rotational drive of one of the first spindle and the second spindle is stopped. In this state, the other spindle is driven. The driven detection means detects whether one spindle is driven by the rotation of the other spindle. Here, if one of the spindles is not driven, it can be reliably detected that the workpiece has been completely cut. If one of the spindles is driven, the cutting of the workpiece is incomplete and still connected. This can be reliably detected. Accordingly, it is possible to avoid that the work discharging operation is performed even though the work is not completely cut, so that damage to the work and further damage to the spindle can be prevented. Further, in the present invention, it is only necessary to monitor the follower of one of the spindles instead of directly monitoring the cutting of the workpiece. Therefore, the follower detecting means does not need to be arranged in the cutting zone and greatly restricts the layout. There is nothing.
[Brief description of the drawings]
FIGS. 1A to 1D are explanatory views of a machine tool to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Machine tool 2 Cutting zone 5 Follow detection mechanism 10 1st spindle 20 2nd spindle 11, 21 Chucking device 15, 25 Drive motor 17 Pulley 31 Tool 32 Parting tool W Work

Claims (2)

A machine tool having a first spindle, a second spindle arranged to face the first spindle, and a tool for cutting a workpiece held between the first spindle and the second spindle In
After performing the cutting operation on the workpiece, the other spindle is driven in a state where the rotation drive of one of the first spindle and the second spindle is stopped, and the rotation of the other spindle is A machine tool comprising follower detecting means for detecting whether or not one spindle is driven. 2. The driven detection unit according to claim 1, wherein the driven detection means determines whether or not the one spindle is driven in the vicinity of a base end portion on the opposite side to a side including the chucking device that holds the workpiece among both ends of the one spindle. A machine tool characterized by detecting the above.

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