JP2022103696A - Chucking confirmation device - Google Patents

Abstract

To provide a chucking confirmation device which can confirm normal chucking of various kinds of work-pieces without requiring position adjustment of a sensor.SOLUTION: A chucking confirmation device 1 includes: detection means 2, 3 which detect the position of a movable body 13 (14) interlocking with opening/closing of a chuck claw 12; and storage means 5 which stores a virtual normal chucking range 4 of the position of the movable body set on the basis of the position of the movable body 13 (14) detected by the detection means 2, 3 when normally chucking a work-piece W with the chuck claw 12 and information on the work-piece W by associating them with each other.SELECTED DRAWING: Figure 1

Description

The present invention relates to a device capable of confirming normal chucking of a workpiece in a chuck of a machine tool.

In a machine tool that automatically supplies a work piece, it is necessary to confirm that the work piece is properly chucked. As a device for confirming that such a workpiece is normally chucked, there is a chuck grasping confirmation device as shown in Patent Document 1. The chuck grasping confirmation device of Patent Document 1 can confirm that the chuck is normally chucked by detecting the movement of the chuck claw with a detector.

JP 2000-210804

However, the chuck grasping confirmation device as described in Patent Document 1 has a problem that the position of the sensor needs to be adjusted every time the type of the workpiece changes.

Therefore, in order to solve the above problems, it is an object of the present invention to provide a chucking confirmation device capable of confirming normal chucking of various workpieces without requiring sensor position adjustment. ..

The chucking confirmation device according to claim 1 has a detection means for detecting the position of a moving body interlocking with the opening and closing of the chuck claw, and a movement detected by the detection means when the workpiece is normally chucked with the chuck claw. It has a virtual normal chucking range of the position of the moving body set based on the position of the body, and a storage means for storing the information of the workpiece in association with each other.

According to the chucking confirmation device of claim 1, even if the type of the workpiece changes, the virtual normal chucking range and the information of the workpiece stored in association with the storage means can be utilized. For various workpieces, normal chucking can be confirmed without adjusting the position of the sensor.

The chucking confirmation device according to claim 2 is the chucking confirmation device according to claim 1, wherein the detection means has a pair of proximity sensors, and the detection means is based on the position of the moving body according to the arrangement of the respective proximity sensors. The virtual normal chucking range of the set moving object position is different.

According to the chucking confirmation device of claim 2, in addition to the same operation as that of the chucking confirmation device of claim 1, accurate detection of the position of the moving object in the detecting means and arrangement of a pair of proximity sensors of the detecting means are performed. Accordingly, the virtual normal chucking range of the optimum moving object position is set.

The chucking confirmation device according to claim 3 is the chucking confirmation device according to claim 2, wherein the pair of proximity sensors are arranged apart from each other in a direction parallel to the moving direction of the moving body, and one of the proximity sensors is arranged. The condition is that the detection result is once output as ON and then output as OFF, and that one proximity sensor outputs the detection result as OFF and then the other proximity sensor outputs the detection result as OFF after a predetermined time has elapsed. If it is determined to be normal chucking, one proximity sensor sets the optimum range of the position of the moving object that turns on the detection result, and then the other proximity sensor turns on the detection result. Set the optimal range of body position.

According to the chucking confirmation device of claim 3, in addition to the same operation as that of the chucking confirmation device of claim 2, it is possible to shorten the time until normal chucking is confirmed.

The chucking confirmation device according to claim 4 is the chucking confirmation device according to claim 2, wherein the pair of proximity sensors are arranged so as to face each other in a direction perpendicular to the moving direction of the moving body, and both proximity sensors are arranged. When it is determined that chucking is normal on the condition that the detection result is output as ON, the optimum range of the position of the moving body that turns on the detection result on both proximity sensors overlaps. Set.

According to the chucking confirmation device of claim 4, in addition to the same operation as the chucking confirmation device of claim 2, normal chucking is performed on condition that both proximity sensors output the detection result as ON. Since it is determined that the chucking is confirmed, the reliability of the chucking confirmation is improved.

The chucking confirmation device according to any one of claims 1 to 4 can confirm normal chucking of various workpieces without requiring sensor position adjustment.

It is a schematic diagram which shows the relationship between an example of a chuck and the virtual normal chucking range set in the chucking confirmation apparatus of the 1st Embodiment of this invention. It is a schematic diagram which shows the relationship between an example of a chuck and the virtual normal chucking range set in the chucking confirmation apparatus of the 2nd Embodiment of this invention. It is a flowchart which sets the virtual range of the position of the moving body in the chucking confirmation device of this invention.

As shown in FIGS. 1 and 2, the chucking confirmation device 1 according to the first embodiment of the present invention is provided on the chuck 10 that grips the workpiece W.

The chuck 10 includes a chuck main body 11, a plurality of chuck claws 12 that can be opened and closed by moving in the radial direction on the circular front surface of the chuck main body 11, a draw member 13 connected to the chuck claw 12, and a draw member. It has a dog 14 provided in 13.

The chuck claw 12 opens and closes when the moving body integrated with the draw member 13 and the dog 14 moves back and forth along the chuck axis direction parallel to the arrow A shown in FIGS. 1 and 2. There is.

The chucking confirmation device 1 of the first embodiment of the present invention shown in FIG. 1 includes a pair of proximity sensors 2 and 3 as detection means for detecting the position of the dog 14 interlocked with the opening and closing of the chuck claw 12, and a workpiece. When W is normally chucked by the chuck claw 12, it is set based on the position of the dog 14 detected by the proximity sensors 2 and 3, and is a virtual range of the position of the moving body which can be regarded as normal chucking. It has 4 and a storage means 5 for storing information of the workpiece W in association with each other.

The pair of proximity sensors 2 and 3 are arranged apart from each other in a direction parallel to the moving direction of the dog 14.

In FIG. 1, the chuck claw 12 closes in the process of moving the draw member 13 which is a part of the moving body in the direction of the arrow A.

The dog 14, which is also a part of the moving body, first passes through the range 2a in which the detection result is turned on by the proximity sensor 2, and after a certain period of time, reaches the range 3a in which the detection result is turned on by the proximity sensor 3. If you can, you can confirm normal chucking.

While waiting for the elapse of this fixed period, there is a time lag until normal chucking is confirmed.

The shorter the distance between the range 2a in which the proximity sensor 2 is turned on and the range 3a in which the detection result is turned on by the proximity sensor 3 in the direction parallel to the moving direction of the moving body, the more normal chucking is performed. The time lag until confirmation can be reduced.

When various workpieces W are normally chucked by the chuck claw 12, the range 2a in which the proximity sensor 2 is turned on based on the position of the dog 14 by the proximity sensor 2 or the proximity sensor 3 and the detection result by the proximity sensor 3 Adjust the range 3a in which is ON.

A virtual position of the dog 14 that can be regarded as normal chucking between the range 2a in which the proximity sensor 2 is turned on and the range 3a in which the proximity sensor 3 is turned on in a direction parallel to the moving direction of the moving body. The target range 4 can be set.

As shown in FIGS. 1A to 1C, a range 2a for turning on the proximity sensor 2 and a range for turning on the detection result by the proximity sensor 3 according to the type of the workpiece W to be chucked. By adjusting with 3a, the virtual range 4 of the position of the dog 14 is different. The storage means 5 stores the information of each workpiece W in association with the corresponding virtual range 4.

Even if the type of the workpiece W changes, the sensor 2 can be used for various workpieces by utilizing the virtual normal chucking range 4 stored in association with the storage means and the information of the workpiece W. Normal chucking can be confirmed without adjusting the positions of, and 3.

The chucking confirmation device 1 of the second embodiment of the present invention shown in FIG. 2 includes a pair of proximity sensors 6 and 7 as detection means for detecting the position of the dog 14 interlocked with the opening and closing of the chuck claw 12, and a workpiece. When W is normally chucked by the chuck claw 12, it is set based on the position of the dog 14 detected by the proximity sensors 6 and 7, and is a virtual range of the position of the moving body which can be regarded as normal chucking. It has 8 and a storage means 9 for storing information of the workpiece W in association with each other.

The pair of proximity sensors 6 and 7 are arranged so as to face each other in a direction perpendicular to the moving direction of the dog 14.

In FIG. 2, the chuck claw 12 closes in the process of moving the draw member 13 which is a part of the moving body in the direction of the arrow A.

When the dog 14, which is also a part of the moving body, is within the range 6a in which the detection result is turned on by the proximity sensor 6 and is within the range 7a in which the detection result is turned on by the proximity sensor 7, it is a normal chat. The King can be confirmed.

When various workpieces W are normally chucked by the chuck claw 12, the range 6a in which the proximity sensor 6 is turned on based on the position of the dog 14 by the proximity sensor 6 or the proximity sensor 7 and the detection result by the proximity sensor 7 Adjust the range 7a to turn on.

The range in which the range 6a for turning on the proximity sensor 6 and the range 7a for turning on the proximity sensor 7 overlap in a direction parallel to the moving direction of the dog 14 which is a part of the moving body is regarded as normal chucking. It can be a virtual range 8 of the position of the dog 14 that can be formed.

As shown in FIGS. 2A to 2C, a range 6a for turning on the proximity sensor 6 and a range for turning on the detection result by the proximity sensor 7 according to the type of the workpiece W to be chucked. By adjusting with 7a, the virtual range 8 of the position of the dog 14 is different. The storage means 5 stores the information of each workpiece W in association with the corresponding virtual range 8.

Even if the type of the workpiece W changes, the sensor 6 can be used for various workpieces by utilizing the virtual normal chucking range 8 stored in association with the storage means and the information of the workpiece W. Normal chucking can be confirmed without adjusting the positions of, and 7.

Hereinafter, the flow for setting the virtual range of the position of the moving body in the chucking confirmation device of the present invention will be described with reference to FIG.

In the step of S1, for example, information on the workpiece such as shape and dimensions is acquired.

In the step of S2, when the workpiece is normally chucked by the chuck claw, the position of the moving body is detected by the proximity sensor which is the detecting means.

In the step of S3, a virtual range of the position of the moving body that can be regarded as normal chucking is set based on the position of the moving body detected in S2.

More specifically, the step S3 includes the steps S31 to S35.

In the step of S31, the arrangement of the pair of proximity sensors is determined.

When the pair of proximity sensors 2 and 3 are arranged apart from each other in the direction parallel to the moving direction of the dog 14, as in the first embodiment described above, the process proceeds to S32.

When the pair of proximity sensors 6 and 7 are arranged so as to face each other in the direction perpendicular to the moving direction of the dog 14, as in the second embodiment described above, the process proceeds to S35.

In S31, the position of the moving body according to the arrangement of the pair of proximity sensors by branching between the arrangement of the pair of proximity sensors of the first embodiment and the arrangement of the pair of proximity sensors of the second embodiment. You can set each virtual range of.

In the step of S32, the range in which the detection result of one of the proximity sensors is turned ON is set.

In the step of S33, the range in which the detection result of the other proximity sensor is turned ON is set.

In the step of S34, the range between the ON range of one proximity sensor and the ON range of the other proximity sensor is set as the virtual range of the position of the moving body.

In the step of S35, the range in which one proximity sensor is turned on and the range in which the other proximity sensor is turned on are set as a virtual range of the position of the moving body.

The ON range of each proximity sensor 2, 3, 6, 7 can be set by utilizing various statistical methods such as 3σ for the data of the position of the dog 14 detected by the detection means. be.

In the step of S4, the virtual range of the position of the moving body of S3 and the information of the workpiece of S1 are associated and stored by the storage means.

In the above embodiment, the chuck 10 has been described as an example of the chuck provided with the chucking confirmation device, but the chuck 10 is not limited thereto. A chucking confirmation device may be provided on the chucks having various other configurations as long as the position of the moving body interlocked with the opening and closing of the chuck claws can be detected.

In the above embodiment, the case where the detection means of the chucking confirmation device 1 is a pair of proximity sensors and the position of the moving body is detected from the position of the dog 14 has been described, but the present invention is not limited to this. The detection means may be a sensor with a detection principle such as another eddy current type, or may have a number of sensors other than two, as long as it can detect the position of the moving body, and may be a dog depending on the detection principle. May not exist.

In the first embodiment, when the pair of proximity sensors 2 and 3 are arranged as shown in FIG. 1, in the second embodiment, the pair of proximity sensors 6 and 7 are arranged as shown in FIG. Each case has been described, but the present invention is not limited to this. Other arrangements may be used as long as the position of the moving body can be detected and the virtual range of the position of the moving body can be set.

In the above-mentioned actual mode, the case where the step of S3 includes the steps of S31 to S35 has been described, but the present invention is not limited to this. If it is possible to set a virtual range of the position of the moving body that can be regarded as normal chucking based on the position of the moving body detected in S2, the virtual range of the position of the moving body can be set in another flow. You may set the target range.

In the above-mentioned actual mode, in S31, the case of branching between the arrangement of the pair of proximity sensors of the first embodiment and the arrangement of the pair of proximity sensors of the second embodiment has been described, but the present invention is limited to this. There is no. There may be a flow in which the sensor arrangement is not determined, or the number of branches due to the sensor arrangement determination may be 3 or more.

1 Chucking confirmation device 2 Proximity sensor 2a Range where the detection result is turned on by the proximity sensor 2 Proximity sensor 3a Range where the detection result is turned on by the proximity sensor 3 4 Virtual range of the position of the moving object 5 Storage means 6 Proximity sensor 6a Range in which the detection result is turned on by the proximity sensor 6 7 Proximity sensor 7a Range in which the detection result is turned on by the proximity sensor 7 Virtual range of the position of the moving body 9 Storage means 10 Chuck 11 Chuck body 12 Chuck claw 13 Draw member 14 dog

Claims (4)

A detection means that detects the position of a moving body that is linked to the opening and closing of the chuck claw,
When the workpiece is normally chucked with the chuck claw, the virtual range of the position of the moving body, which is set based on the position of the moving body detected by the detection means and can be regarded as normal chucking, and A chucking confirmation device having a storage means for storing information in association with information on a workpiece. The detection means has a pair of proximity sensors and
The chucking confirmation device according to claim 1, wherein the virtual range of the position of a moving body that can be regarded as normal chucking differs depending on the arrangement of each proximity sensor. The pair of proximity sensors are spaced apart from each other in a direction parallel to the direction of movement of the dock.
One proximity sensor outputs the detection result as ON and then outputs it as OFF, and one proximity sensor outputs the detection result as OFF and then the other proximity sensor outputs the detection result as OFF after a predetermined time has elapsed. If it is determined that the chucking is normal on the condition that it is done, one proximity sensor sets the optimum range of the position of the moving object that turns on the detection result, and then the other proximity sensor sets the detection result. The chucking confirmation device according to claim 2, wherein the optimum range of the position of the moving body is set to ON. The pair of proximity sensors are arranged so as to face each other in the direction perpendicular to the moving direction of the dock.
When it is determined that the chucking is normal on the condition that both proximity sensors output the detection result as ON once, the optimum position of the moving body for which the detection result is turned on by both proximity sensors is optimized. The chucking confirmation device according to claim 2, wherein the ranges are set so as to overlap each other.

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