JP5283563B2 - Workpiece measuring apparatus and method for machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece measuring device achieving high precision three-dimensional measurement with necessary minimum measurement data without modifying an NC device. <P>SOLUTION: In the workpiece measuring device 20, a sending/receiving section 22 outputs a timing pulse P from a pulse output section 24 to a programmable controller 25, and outputs a measuring command f to a measuring head 8 at every certain time interval. Upon receiving the timing pulse, the programmable controller captures position data of the measuring head at every certain time interval. Upon receiving the measuring command, the measuring head measures the workpiece 9 at every certain time interval and at a timing positively advanced by a time difference preset by an estimation system 29 disposed in the measuring head. As a result, a first time that the programmable controller captures the position data C1 of the measuring head is matched with a second time that the measuring head measures the workpiece. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a workpiece measuring apparatus and method for a machine tool that measures a workpiece with a measuring head that is detachably mounted on a spindle of the machine tool.

In a machine tool such as a machining center, there has already been proposed a technique for measuring the shape of the surface of a workpiece while the machined workpiece is not removed from the machine tool and installed on the machine tool. For example, Patent Document 1 (Japanese Patent Publication No. 2007-518579) describes a workpiece inspection system for machine tools.
In this inspection system, a probe (corresponding to the measuring head of the present invention) is mounted on the spindle of a machine tool. Measurement data when the probe needle is brought into contact with the workpiece (workpiece) is output, and the NC device also acquires probe position data. Then, the workpiece is inspected by combining the measurement data and the position data.

Special table 2007-518579 gazette

In the inspection system described in Patent Document 1, it has been necessary to make modifications and changes such as adding a new function to the NC apparatus. In addition, an enormous number of measurement data is output from the probe as compared with the number of position data acquired by the NC apparatus. A necessary number of measurement data is selected from the enormous number of measurement data. As a result, a time lag occurs between the position data and the measurement data, and it is difficult to obtain a highly accurate result.
Moreover, since the number of measurement data is enormous, the amount of data increases overall. As a result, an interface for transmission and a CPU for arithmetic processing have to have a large processing capacity. It was also necessary to increase the memory capacity for storing a huge number of measurement data.
This system is a method in which the probe needle makes contact with the workpiece to perform measurement. Therefore, it is difficult to scan the probe at high speed and safely and without vibration or with low vibration. Moreover, it was difficult to measure a wide range of the workpiece in a short time.

  The present invention has been made to solve such a problem, and the measuring head for the measurement point on the workpiece is not modified or modified without adding a new function to the NC device. The operation of acquiring data of at least two axial positions and the operation of measuring the workpiece by the measuring head at that time are always repeated at regular intervals at the same timing, and the minimum necessary measurement is performed. An object of the present invention is to provide a workpiece measuring apparatus and method for a machine tool capable of performing two-dimensional measurement or three-dimensional measurement of a workpiece with high accuracy by processing data.

In order to achieve the above-described object, a workpiece measuring device in a machine tool according to the present invention includes an NC device that controls the machine tool, and a measuring head that is detachably mounted on a spindle of the machine tool and measures the workpiece. And a transmission / reception unit that transmits and receives to and from the measurement head, and a control device that controls the workpiece measurement device, and is a device that measures the workpiece, the workpiece measurement device comprising: including the of the measuring head against the measured point on the workpiece, and a second axial measuring head scans the first axial Toko this measuring head is to measure the distance to the workpiece A programmable controller that obtains at least two axial position data from the NC device at regular time intervals, and a timing provided in the transmission / reception unit and having a pulse interval corresponding to the constant time interval. A pulse output unit for outputting a pulse, and the transmission / reception unit outputs the timing pulse from the pulse output unit to the programmable controller and at the same time outputs a measurement command to the measurement head at each predetermined time interval. When the timing pulse is received, the programmable controller obtains the position data of the measurement head at every certain time interval, and the measurement head is provided in the measurement head when the measurement command is received. The workpiece is measured at each predetermined time interval at a timing that is positively advanced by a preset time difference in the prediction system, and as a result, the programmable controller acquires the position data of the measuring head. The time and the second time when the measuring head measures the workpiece. It was.
A workpiece measuring device in a machine tool according to another aspect of the present invention includes an NC device that controls the machine tool, a measuring head that is detachably mounted on a spindle of the machine tool, and measures the workpiece, and the measuring head, A device for measuring the workpiece, wherein the workpiece measuring device includes a transmission / reception unit that performs transmission / reception between the workpiece and a workpiece measuring device. of the measuring head against the measuring point, the position of the at least two axial directions in which the first axial Toko measurement head the measuring head is to measure the distance to the workpiece and a second axial scanning The programmable controller that acquires the data of the NC unit at regular time intervals and the transmission / reception unit that outputs a timing pulse having a pulse interval corresponding to the constant time interval. And the transmission and reception unit outputs the timing pulse from the pulse output unit to the programmable controller and at the same time generates a measurement command for each predetermined time interval, and the programmable controller When a pulse is received, the position data of the measurement head is acquired at each predetermined time interval, and the measurement head is set to the predetermined time by a time difference set in advance by a prediction system provided in the transmission / reception unit. The workpiece is measured at the certain time interval by the measurement command output from the transmission / reception unit to the measurement head in advance of the timing of the interval and in accordance with the timing of the timing pulse, and as a result, A first controller for acquiring the position data of the measuring head; And between the measuring head is caused to coincide and a second time to measure the workpiece by the measurement command.
A workpiece measuring device in a machine tool according to another aspect of the present invention includes an NC device that controls the machine tool, a measuring head that is detachably mounted on a spindle of the machine tool, and measures the workpiece, and the measuring head, A device for measuring the workpiece, wherein the workpiece measuring device includes a transmission / reception unit that performs transmission / reception between the workpiece and a workpiece measuring device. of the measuring head against the measuring point, the position of the at least two axial directions in which the first axial Toko measurement head the measuring head is to measure the distance to the workpiece and a second axial scanning The programmable controller that acquires the data of the NC unit at regular time intervals and the transmission / reception unit that outputs a timing pulse having a pulse interval corresponding to the constant time interval. And the transmission / reception unit outputs the timing pulse from the pulse output unit to the programmable controller, and at the same time outputs a measurement command to the measurement head at each predetermined time interval, and the programmable controller Receives the timing pulse, obtains the position data of the measuring head at every predetermined time interval, and when the measuring head receives the measurement command, the measuring head uses a prediction system provided in the measuring head in advance. Measuring the workpiece at the predetermined time interval at a timing that is positively advanced by a set time difference, and as a result, a first time when the programmable controller acquires the position data of the measuring head; and A second time during which the measuring head measures the workpiece, and the programmer The position controller obtains the position data and the workpiece measurement operation by the measuring head at that time is always repeated at the same time interval at the predetermined time interval, and obtained by the programmable controller. The measured position data of the measurement head is output to the control device, and the transmission / reception unit transmits the measurement command to the measurement head, and then outputs the measurement data received from the measurement head to the control device. Then, the control device obtains the two-dimensional shape data or the three-dimensional shape data of the workpiece by performing an operation based on the position data and the measurement data.
A workpiece measuring device in a machine tool according to another aspect of the present invention includes an NC device that controls the machine tool, a measuring head that is detachably mounted on a spindle of the machine tool, and measures the workpiece, and the measuring head, A device for measuring the workpiece, wherein the workpiece measuring device includes a transmission / reception unit that performs transmission / reception between the workpiece and a workpiece measuring device. of the measuring head against the measuring point, the position of the at least two axial directions in which the first axial Toko measurement head the measuring head is to measure the distance to the workpiece and a second axial scanning The programmable controller that acquires the data of the NC unit at regular time intervals and the transmission / reception unit that outputs a timing pulse having a pulse interval corresponding to the constant time interval. And the transmission and reception unit outputs the timing pulse from the pulse output unit to the programmable controller and at the same time generates a measurement command for each predetermined time interval, and the programmable controller When a pulse is received, the position data of the measurement head is acquired at each predetermined time interval, and the measurement head is set to the predetermined time by a time difference set in advance by a prediction system provided in the transmission / reception unit. The workpiece is measured at the certain time interval by the measurement command output from the transmission / reception unit to the measurement head in advance of the timing of the interval and in accordance with the timing of the timing pulse, and as a result, A first controller for acquiring the position data of the measuring head; And the second time during which the measuring head measures the workpiece according to the measurement command, the operation of acquiring the position data by the programmable controller, and the work by the measuring head at that time The measurement operation of the object is always repeated at the same timing for each predetermined time interval, and the position data of the measurement head acquired by the programmable controller is output to the control device, and the transmission / reception is performed. After transmitting the measurement command to the measurement head, the unit outputs measurement data received from the measurement head to the control device, and the control device performs an operation based on the position data and the measurement data. Thus, the two-dimensional shape data or three-dimensional shape data of the workpiece is obtained. The controller has a buffer memory for temporarily storing the position data of the measurement head. When the programmable controller acquires the position data of the measurement head, the position data is temporarily stored in the buffer memory. It is preferable that the data is stored and then output from the buffer memory to the control device.
The control device includes a measurement data storage unit for storing the measurement data, and the position data acquired by the programmable controller and stored in the buffer memory, as a command of a start address memory provided in the control device, and A position data storage unit that sequentially reads out and stores the position data read out in accordance with a command of a memory address counter provided in the buffer memory, and an operation that performs an operation based on the measurement data and the position data It is preferable to have a processing unit.
The measuring head receives the measurement command, by measuring the distance to the workpiece from the measuring head, it is preferable to measure the workpiece without contact.
The machine tool according to an embodiment includes a three-axis control for linearly moving the measurement head and the workpiece relatively in three orthogonal axes, and a relative rotation of the measurement head and the workpiece. A processing machine that performs at least one-axis control.
Preferably, the measuring head is able to measure the workpiece inclined relative to its central axis.
Preferably, the measuring head is automatically exchanged with respect to the spindle by an automatic tool changer, and the spindle is attached to the spindle during or after the machining process of the workpiece with a tool attached to the spindle. A step of measuring the workpiece with the mounted measurement head is provided so that the machining operation and the measurement operation are continued in order or in the reverse order.
A measuring method according to the present invention is a method of measuring a workpiece with a measuring head that is detachably mounted on a spindle of a machine tool, and the workpiece measuring device used in this method controls the machine tool. An NC device, the measurement head that is detachably attached to the spindle of the machine tool, measures the workpiece, a transmission / reception unit that transmits and receives to / from the measurement head, and controls the workpiece measurement device a control device for, of the measuring head against the measured point on the workpiece, the measuring head is a distance measurement is carried out a second measurement head in the first axial Toko scans of up to the workpiece A programmable controller that obtains at least two axial position data including the axial direction from the NC device at regular time intervals, and is provided in the transmission / reception unit, and corresponds to the regular time intervals. A pulse output unit that outputs a timing pulse having a pulse interval, wherein the transmission measuring unit outputs the timing pulse from the pulse output unit to the programmable controller. At the same time, a measurement command is output to the measurement head at every fixed time interval, and when the programmable controller receives the timing pulse, the programmable controller acquires the position data of the measurement head at every fixed time interval, When the measurement head receives the measurement command, the measurement head measures the workpiece at the predetermined time intervals at a timing that is positively advanced by a time difference set in advance by a prediction system provided in the measurement head. The programmable controller acquires the position data of the measuring head 1 time and said measurement head is matched and a second time to measure the workpiece.
Another measuring method according to the present invention is a method of measuring a workpiece with a measuring head that is detachably mounted on a spindle of a machine tool, and the workpiece measuring apparatus used in this method includes the above-mentioned machine tool. An NC device to be controlled, the measuring head that is detachably mounted on the spindle of the machine tool, measures the workpiece, a transmission / reception unit that transmits and receives between the measuring head, and the workpiece measuring device a control device for controlling said of the measuring head against the measured point on the workpiece, first the measuring head measures the head scans the first axial Toko for measuring the distance to the workpiece A programmable controller that obtains data of at least two axial positions including two axial directions from the NC device at regular time intervals and the transmission / reception unit, and corresponds to the constant time intervals. A pulse output unit that outputs a timing pulse having a pulse interval, wherein the transmission measuring unit outputs the timing pulse from the pulse output unit to the programmable controller. At the same time, a measurement command is generated for each predetermined time interval, and when the programmable controller receives the timing pulse, the programmable controller obtains the position data of the measurement head for each predetermined time interval. The time difference set in advance by the prediction system provided in the transmission / reception unit is output from the transmission / reception unit to the measurement head in advance of the predetermined time interval and in accordance with the timing of the timing pulse. The workpiece is moved at the predetermined time intervals according to the measured command. As a result, the first time for the programmable controller to acquire the position data of the measuring head and the second time for the measuring head to measure the workpiece according to the measurement command are matched. .
Another measuring method according to the present invention is a method of measuring a workpiece with a measuring head that is detachably mounted on a spindle of a machine tool, and the workpiece measuring apparatus used in this method includes the above-mentioned machine tool. An NC device to be controlled, the measuring head that is detachably mounted on the spindle of the machine tool, measures the workpiece, a transmission / reception unit that transmits and receives between the measuring head, and the workpiece measuring device a control device for controlling said of the measuring head against the measured point on the workpiece, first the measuring head measures the head scans the first axial Toko for measuring the distance to the workpiece A programmable controller that obtains data of at least two axial positions including two axial directions from the NC device at regular time intervals and the transmission / reception unit, and corresponds to the constant time intervals. A pulse output unit that outputs a timing pulse having a pulse interval, wherein the transmission measuring unit outputs the timing pulse from the pulse output unit to the programmable controller. At the same time, a measurement command is output to the measurement head at each fixed time interval, and when the programmable controller receives the timing pulse, the position data of the measurement head is acquired at each fixed time interval, When the measurement head receives the measurement command, the measurement head measures the workpiece at the predetermined time intervals at a timing that is positively advanced by a time difference set in advance by a prediction system provided in the measurement head. As a result, the programmable controller obtains the position data of the measuring head And the second time when the measuring head measures the workpiece, the operation of acquiring the position data by the programmable controller, and the workpiece by the measuring head at that time The measurement operation is always repeated at the same timing at the predetermined time intervals, and the position data of the measurement head acquired by the programmable controller is output to the control device of the workpiece measurement device. The transmission / reception unit transmits the measurement command to the measurement head, and then outputs measurement data received from the measurement head to the control device. The control device is based on the position data and the measurement data. 2D shape data or 3D shape data of the workpiece is obtained.
Another measuring method according to the present invention is a method of measuring a workpiece with a measuring head that is detachably mounted on a spindle of a machine tool, and the workpiece measuring apparatus used in this method includes the above-mentioned machine tool. An NC device to be controlled, the measuring head that is detachably mounted on the spindle of the machine tool, measures the workpiece, a transmission / reception unit that transmits and receives between the measuring head, and the workpiece measuring device a control device for controlling said of the measuring head against the measured point on the workpiece, first the measuring head measures the head scans the first axial Toko for measuring the distance to the workpiece A programmable controller that obtains data of at least two axial positions including two axial directions from the NC device at regular time intervals and the transmission / reception unit, and corresponds to the constant time intervals. A pulse output unit that outputs a timing pulse having a pulse interval, wherein the transmission measuring unit outputs the timing pulse from the pulse output unit to the programmable controller. At the same time, a measurement command is generated for each predetermined time interval, and when the programmable controller receives the timing pulse, the programmable controller obtains the position data of the measurement head for each predetermined time interval. The time difference set in advance by the prediction system provided in the transmission / reception unit is output from the transmission / reception unit to the measurement head in advance of the predetermined time interval and in accordance with the timing of the timing pulse. The workpiece is moved at the predetermined time intervals according to the measured command. As a result, the first time when the programmable controller acquires the position data of the measuring head and the second time when the measuring head measures the workpiece according to the measurement command are matched, The operation of acquiring the position data by the programmable controller and the operation of measuring the workpiece by the measuring head at that time are always repeated at the same timing at the predetermined time interval, and the programmable controller The acquired position data of the measurement head is output to the control device of the workpiece measurement device, and the transmission / reception unit transmits the measurement command to the measurement head and then receives the measurement data from the measurement head. To the control device, which is based on the position data and the measurement data. 2D shape data or 3D shape data of the workpiece is obtained.

  The workpiece measuring device and method therefor in the machine tool according to the present invention are configured as described above, and thus the workpiece on the workpiece is not modified or modified such as adding a new function to the NC device. The operation of acquiring the data of the position of the measuring head in at least two axial directions with respect to the measuring point and the operation of measuring the workpiece by the measuring head at that time are always repeated at regular time intervals at the same timing. By processing the minimum necessary measurement data, the workpiece can be two-dimensionally or three-dimensionally measured with high accuracy.

1 to 10 are views for explaining an embodiment of the present invention, and FIG. 1 is a perspective view of a machine tool provided with a workpiece measuring device of the present invention. It is a schematic block diagram of the workpiece measuring apparatus concerning an example with which the prediction system was provided in the measurement head. It is a fragmentary sectional view of the measuring head with which the main axis was equipped. It is a block diagram of a measurement head. It is a wave form diagram for demonstrating this invention. It is a wave form diagram of the workpiece measuring apparatus of a present Example. It is explanatory drawing which shows a workpiece measurement state It is a table | surface which shows the data input into the control apparatus, and the calculation result. It is a schematic block diagram of the workpiece measuring apparatus concerning the other example with which the prediction system was provided in the transmission / reception part, and is a figure equivalent to FIG. FIG. 10 is a block diagram of the measuring head shown in FIG. 9, corresponding to FIG. FIGS. 11 to 12F are views for explaining a modification of the present embodiment, and FIG. 11 is a perspective view of another machine tool provided with the workpiece measuring device of the present invention. It is explanatory drawing which shows a workpiece measurement state. It is explanatory drawing which shows a workpiece measurement state. It is explanatory drawing which shows a workpiece measurement state. It is explanatory drawing which shows a workpiece measurement state. It is explanatory drawing which shows a workpiece measurement state. It is explanatory drawing which shows a workpiece measurement state.

In the workpiece measuring apparatus according to the present invention, the transmission / reception unit outputs a timing command from the pulse output unit to the programmable controller, and at the same time outputs a measurement command to the measurement head at regular time intervals. When receiving the timing pulse, the programmable controller acquires the position data of the measuring head at regular time intervals. When the measurement head receives the measurement command, the measurement head measures the workpiece at regular time intervals at a timing that is positively advanced by a time difference set in advance by a prediction system provided in the measurement head.
By doing so, the first time when the programmable controller acquires the position data of the measuring head is matched with the second time when the measuring head measures the workpiece.
The programmable controller performs an operation of acquiring position data in at least two axial directions of the measuring head with respect to the measurement point on the workpiece. On the other hand, the measuring head performs an operation of measuring the workpiece at that time. These acquisition operation and measurement operation are always repeated at the same timing and at regular time intervals.
As a result, the minimum necessary measurement data is processed without modifying or changing the NC device such as adding a new function, so that the workpiece can be measured two-dimensionally or three-dimensionally with high accuracy. The purpose is realized.

  In the following embodiments and modifications, the case where the machine tool is a vertical machining center and a five-axis machine is shown. The machine tool may be a horizontal machining center, a lathe, a lathe, or a grinding machine.

Hereinafter, an embodiment of the present invention and modifications thereof will be described with reference to FIGS. 1 to 12F.
1 to 10 are views for explaining an embodiment of the present invention, and FIG. 1 is a perspective view of a machine tool provided with a workpiece measuring device of the present invention. FIG. 2 is a schematic configuration diagram of a workpiece measuring apparatus according to an example in which the prediction system is provided in the measuring head, FIG. 3 is a partial sectional view of the measuring head mounted on the main shaft, and FIG. 4 is a block diagram of the measuring head. FIG. 5 is a waveform diagram for explaining the principle of the present invention.
FIG. 6 is a waveform diagram of the workpiece measuring apparatus of the present embodiment, FIG. 7 is an explanatory diagram showing a workpiece measuring state in the present invention, and FIG. 8 is a table showing data input to the control device and calculation results. is there.

As shown in FIGS. 1 and 2, in this embodiment, a vertical machining center is shown as the machine tool 1. The machine tool 1 includes a bed 2, a column 3 installed on the bed 2, a spindle head 5 having a spindle 4, and a saddle 7 having a table 6. The machine tool 1 is controlled by an NC device (numerical control device) 13.
The spindle head 5 is supported on the front surface of the column 3 and is movable in the vertical direction (Z-axis direction). A tool (not shown) or a measurement head 8 is detachably attached to the tip of the main shaft 4. The main shaft 4 is supported by the main shaft head 5 so that the center axis thereof is parallel to the Z axis and is rotatable around the center axis.

The saddle 7 is disposed on the bed 2 and is movable in the front-rear horizontal direction (Y-axis direction). A table 6 is arranged on the saddle 7. The table 6 is movable in the left and right horizontal direction (X-axis direction). A workpiece 9 is placed on the table 6. Three orthogonal axes are constituted by the X, Y, and Z axes orthogonal to each other.
The spindle head 5 supported by the column 3 is driven by the Z-axis feed mechanism 10 and moves in the Z-axis direction. The saddle 7 disposed on the bed 2 is driven by the Y-axis feed mechanism 11 and moves in the Y-axis direction. The table 6 placed on the saddle 7 and supporting the workpiece 9 is driven by the X-axis feed mechanism 12 and moves in the X-axis direction.

The NC device 13 controls the Z-axis feed mechanism 10, the Y-axis feed mechanism 11, and the X-axis feed mechanism 12, respectively. The NC device 13 controls an ATC (automatic tool changer) 14 for automatically changing the tool and the measuring head 8 with respect to the spindle 4.
Accordingly, the machine tool 1 is a machining center that performs three-axis control for linearly moving the measuring head 8 and the workpiece 9 relatively in the three orthogonal directions of the X, Y, and Z axes. Note that the spindle head 5 that supports the measuring head 8 may be moved in the X-axis and Y-axis directions with respect to the workpiece 9.

As shown in FIGS. 1 to 8, the workpiece measuring device 20 and the workpiece measuring method using the workpiece measuring device 20 are configured so that the workpiece 9 is not contacted by a measuring head 8 that is detachably attached to the spindle 4 of the machine tool 1. (Or in contact).
The workpiece measuring device 20 includes an NC device 13 that controls the machine tool 1 and a measuring head 8 that is detachably attached to the spindle 4 of the machine tool 1 and measures the workpiece 9. The workpiece measuring device 20 includes a transmission / reception unit 22 that performs transmission / reception with the measuring head 8 and a control device (for example, a personal computer) 23 that controls the workpiece measuring device 20.

The workpiece measuring device 20 further includes a programmable controller 25 (hereinafter referred to as a controller 25) that controls the machine tool 1 and a pulse output unit 24.
The controller 25 is included in the NC device 13. The controller 25 is, for example, a PMC (programmable machine controller) or a PLC (programmable logic controller). The controller 25 may be provided separately from the NC device 13.
The controller 25 reads and acquires the position data of the measuring head 8 from the NC device 13 at regular time intervals ΔT. The position data of the measuring head 8 against the measured point S on the workpiece 9, the measuring a first axial this measuring head 8 to measure the distance D to the workpiece 9 (Z-axis direction) This is data of positions in at least two axial directions (Z-axis direction, X-axis direction) including the second axial direction (X-axis direction) scanned by the fixed head 8. This “position in the biaxial direction” is often a position in the Z-axis direction and the X-axis direction orthogonal to each other, but the two axes may not be orthogonal.

The transmission / reception unit 22 includes a clock 17 and a pulse output unit 24. The clock 17 outputs a regular signal at regular time intervals ΔT. The pulse output unit 24 outputs a timing pulse P corresponding to a certain time interval ΔT according to the signal of the clock 17.
The pulse output unit 24 outputs a timing pulse P having a pulse interval (time interval from one pulse to the next pulse) ΔT corresponding to a certain time interval ΔT of the clock 17 to the controller 25 via the cable 60. The timing pulse P is a “pulse for timing”, and is used for adjusting the timing in the transmission / reception unit 22 in this embodiment.
In this embodiment, the constant time interval ΔT of the signal output from the clock 17 is 16 [msec (milliseconds)]. It is preferable that the pulse interval ΔT of the timing pulse P is basically 16 [msec], and the pulse interval ΔT and the constant time interval ΔT are the same.

When the workpiece 9 is measured by the workpiece measuring apparatus 20, the transmission / reception unit 22 outputs the timing pulse P from the pulse output unit 24 to the controller 25 via the cable 60, and at the same time, the measurement command at a certain time interval ΔT. f is output to the measuring head 8. The measurement command f is a command that matches the timing of the timing pulse P.
When the controller 25 receives the timing pulse P, the controller 25 reads and acquires the position data of the measuring head 8 from the NC device 13 at regular time intervals ΔT. The controller 25 according to the present embodiment acquires position data of the measurement head 8 in the three orthogonal axes directions (X axis direction, Y axis direction, Z axis direction) with respect to the measurement point S on the workpiece 9. The “position of the measuring head 8” is, for example, the center position S1 of the imaging surface 51 of the CCD camera 45 described later, but may be a position other than this.

A signal F such as a measurement command f or measurement data is transmitted and received wirelessly between the transmission / reception unit 22 and the measurement head 8 mounted on the spindle 4.
The transmission / reception unit 22 transmits the signal F of the measurement command f to the measurement head 8. When the measurement head 8 receives the measurement command f, the measurement head 8 moves the workpiece 9 every predetermined time interval ΔT at a timing that is positively advanced by a time difference n set in advance by the prediction system 29 provided in the measurement head 8. taking measurement.
In this case, the measuring head 8 measures the distance D from the measuring head 8 to the workpiece 9. The measured data signal F is wirelessly transmitted from the measurement head 8 to the transmission / reception unit 22. The measurement data B 1 received from the measurement head 8 by the transmission / reception unit 22 is output to the control device 23.
As a result, the first time T1 when the controller 25 reads and acquires the position data C1 of the measuring head 8 and the second time T2 when the measuring head 8 measures the workpiece 9 according to the measurement command f are matched. (See symbol H in FIG. 6).

The first time T1 is a time for the controller 25 to acquire position data of the measuring head 8 with respect to the measurement point S on the workpiece 9 in at least two axial directions from the NC device 13 at regular time intervals ΔT. . The first time T1 is not limited to one, but is present at regular time intervals ΔT.
The second time T2 is a time during which the measuring head 8 measures the distance D from the measuring head 8 to the workpiece 9 at regular time intervals ΔT according to the measurement command f. Note that the second time T2 is not limited to one, but is present at every fixed time interval ΔT.

Thus, the operation of acquiring the position data C1 by the controller 25 and the operation of measuring the workpiece 9 by the measuring head 8 at that time are always at the same timing (that is, simultaneously) at regular time intervals ΔT. Repeatedly.
That is, the controller 25 reads and acquires position data C1 of at least two axial directions (Z-axis direction and X-axis direction) of the measuring head 8 with respect to the measurement point S on the workpiece 9 from the NC device 13.
Simultaneously with the operation of the controller 25 and at regular time intervals ΔT, the measuring head 8 measures the distance D from the measuring head 8 to the workpiece 9 at that time.

The position data C 1 of the measuring head 8 acquired by the controller 25 is output to the control device 23. The transmission / reception unit 22 transmits the measurement command f to the measurement head 8 and then outputs the measurement data B 1 received from the measurement head 8 to the control device 23.
The control device 23 obtains two-dimensional shape data or three-dimensional shape data of the workpiece 9 by performing calculations based on the position data C1 and the measurement data B1.

According to the workpiece measuring device 20 having the above-described configuration and the workpiece measuring method using the device 20, it is not necessary to modify or change the NC device 13 such as adding a new function. The operation of acquiring position data C1 in at least two axial directions (Z-axis direction and X-axis direction) of the measuring head 8 with respect to the measurement point S on the workpiece 9 and the workpiece 9 by the measuring head 8 at that time are obtained. The measurement operation is always repeated at a constant time interval ΔT at the same timing.
As a result, the workpiece 9 can be measured two-dimensionally or three-dimensionally with high accuracy by processing the minimum necessary measurement data B1.

The controller 25 has a buffer memory 16 for temporarily storing the position data C1 of the measuring head 8 read from the NC device 13.
When the controller 25 obtains the position data C 1 of the measuring head 8, the position data C 1 is temporarily stored in the buffer memory 16 and then output from the buffer memory 16 to the control device 23.

The control device 23 includes a measurement data storage unit 21 that stores the measurement data B1, a position data storage unit 26, and an arithmetic processing unit 27.
The position data storage unit 26 stores at least biaxial direction position data C1 acquired by the controller 25 and temporarily stored in the buffer memory 16. The position data storage unit 26 receives position data according to a command output from a start address memory 37 provided in the control device 23 and a command from a memory address counter (latest address counter) 38 provided in the buffer memory 16. C1 is sequentially read and the position data C1 read in this way is stored. The two storage units 21 and 26 may be provided separately from the control device 23.
The arithmetic processing unit 27 includes data on the distance D measured by the measuring head 8 (that is, measurement data B1), and position data (Z-axis direction, X-axis direction) acquired by the controller 25 ( The calculation is performed based on the data C1) indicating the position of the measuring head 8.

When the controller 25 receives the timing pulse P from the pulse output unit 24, the controller 25 acquires the position data C 1 of the measuring head 8 from the NC device 13 at regular time intervals ΔT, and then outputs the position data C 1 to the control device 23. To do.
The controller 25 of this embodiment is provided with a buffer memory 16. The controller 25 acquires the position data of the measuring head 8 from the NC device 13 at the timing of the signal output at every fixed time interval ΔT by the timing pulse P, and then temporarily stores it in the buffer memory 16. Thereafter, the position data C1 stored in the buffer memory 16 is sent to and stored in the position data storage unit 26 of the control device 23.

The buffer memory 16 is a ring-shaped memory. The buffer memory 16 receives the position data of the position of the measuring head 8 [three orthogonal directions (X-axis direction, Y-axis direction, Z-axis direction) according to a command from a memory address counter (latest address counter) 38 provided in the controller 25. C1] is temporarily stored.
Therefore, the current position information (coordinates) 53 in the X-axis direction by the operation of the servo motor of the X-axis feed mechanism 12, and the current position information (coordinates) 54 in the Y-axis direction by the operation of the servo motor of the Y-axis feed mechanism 11 The current position information (coordinates) 55 in the Z-axis direction by the operation of the servo motor of the Z-axis feed mechanism 10 is output to the buffer memory 16 and temporarily stored as position data C1.

For example, the controller 25 provides current position information 53, 54, 55 in the X-axis direction, Y-axis direction, and Z-axis direction of the measuring head 8 when the first measured point S on the workpiece 9 is measured. Read from the NC device 13. Then, the coordinate value “X, Y, Z” is written in the address “1” of the buffer memory 16.
Next, the controller 25 stores the current position information 53, 54, 55 in the X-axis direction, the Y-axis direction, and the Z-axis direction of the measuring head 8 when the second measured point S on the workpiece 9 is measured. Read from the NC device 13. Then, the next coordinate value “X, Y, Z” is written in the address “2” of the buffer memory 16.
In the same manner, current position information 53, 54, 55 in the X-axis direction, Y-axis direction, and Z-axis direction of the measuring head 8 when the N-th measured point S on the workpiece 9 is measured, The controller 25 reads from the NC device 13. Then, the coordinate value “X, Y, Z” is written in the address “N” of the buffer memory 16.

In this way, the first to Nth position data C1 of the measuring head 8 are temporarily stored in the buffer memory 16 in order. Thereafter, N or a predetermined number of position data C 1 are simultaneously stored in the position data storage unit 26 of the control device 23.
The buffer memory 16 may be provided at a place other than the controller 25, for example, in the NC device 13. Further, the buffer memory 16 does not have to be ring-shaped, and for example, a memory provided in each of the NC device 13 or the controller 25 can be used.

The control device 23 sequentially stores the measurement data B1 sent from the transmission / reception unit 22 in the measurement data storage unit 21. The position data C1 stored in the buffer memory 16 is sequentially read from the buffer memory 16 in accordance with a command output from the start address memory 37 and a command from the memory address counter (latest address counter) 38 of the buffer memory 16. And stored in the position data storage unit 26.
The arithmetic processing unit 27 performs a calculation based on the position data C1 stored in the position data storage unit 26 and the measurement data B1 stored in the measurement data storage unit 21. Thereby, the two-dimensional shape data or the three-dimensional shape data of the workpiece 9 is obtained.

In the present embodiment, in the prediction system 29 of the measurement head 8, the measurement command f for the measurement head 8 is positively advanced by the time difference n set in advance by the prediction system 29.
Thus, the operation of acquiring the position data C1 by the controller 25 and the operation of measuring the workpiece 9 by the measuring head 8 at that time are always repeated at the same timing (that is, simultaneously) at regular time intervals ΔT. It is done.

The measuring head 8 is handled in the same way as a tool and can be stored in a tool magazine. With the ATC 14 controlled by the NC device 13, the measuring head 8 is automatically exchanged with respect to the main shaft 4 and is detachable.
Therefore, if a process for measuring the workpiece 9 with the measuring head 8 attached to the spindle 4 is provided during or after the machining process of the workpiece 9 with the tool attached to the spindle 4, the machining operation and the measurement are performed. The operation continues in order or in the reverse order. In other words, the machining operation and the measurement operation can be executed in any combination.
In this way, even if the workpiece 9 is not removed from the table 6 for measurement, the workpiece 9 is immediately attached to the table 6 after being processed, and the workpiece 9 is immediately measured two-dimensionally or three-dimensionally. Can do. Moreover, after the operation | movement which measured the workpiece 9, it can also transfer to the operation | movement which processes the workpiece 9 again.

The measurement head 8 has a housing 30 and a mounting member 31 fixed to the housing 30. The shank 32 of the mounting member 31 is detachably mounted on the main shaft 4 and is clamped / unclamped by a clamp / unclamp mechanism (not shown).
Electric power is supplied to the measuring head 8 by a non-contact power supply device 33. The power feeding device 33 includes a primary side feeding coil 34 attached to the main shaft 4, an AC power source 35 that supplies current to the feeding coil 34, and a secondary side receiving coil 36 attached to the measuring head 8. doing.
In a state in which the measuring head 8 is detachably mounted on the main shaft 4 of the machine tool 1, the power feeding coil 34 and the power receiving coil 36 face each other at a constant interval without contact.
When an AC voltage is applied from the AC power source 35 to the primary power supply coil 34, an induced electromotive force is generated on the power receiving coil 36 side due to the magnetic flux generated on the power supply coil 34 side. As a result, power is supplied from the power feeding coil 34 to the power receiving coil 36. The power supplied to the power receiving coil 36 is supplied to each device of the measuring head 8.

Inside the housing 30, there are a laser oscillator 40, prisms 41 and 42 having reflecting mirrors, lenses 43 and 44, a CCD [Charge Coupled Device] camera 45, a control device 46 for a measuring head, a prediction system 29, and the like. Is provided.
A radio 48 having an antenna 47 is attached to the housing 30. The wireless device 48 transmits / receives a measurement command f and measurement data to / from the transmission / reception unit 22 by a signal F.
The laser oscillator 40 generates a laser beam L for irradiating the surface of the workpiece 9. The CCD camera 45 receives the laser light L reflected from the surface of the workpiece 9 and generates two-dimensional image data. The lenses 43 and 44 form an image of the laser light L reflected on the surface of the workpiece 9 on the imaging surface 51 of the CCD camera 45.
Accordingly, the laser light L generated by the laser oscillator 40 is reflected by the prisms 41 and 42, passes through the diaphragm 52, passes through the lenses 43 and 44, and is irradiated to the measurement point S on the surface of the workpiece 9.
The laser light L reflected from the measurement point S on the workpiece 9 is refracted by the lenses 44 and 43, passes through the stop 52, and is converged as an annular image on the imaging surface 51 of the CCD camera 45.

The measurement head control device 46 includes a distance calculation unit 49 that calculates the measured distance D and a transmission / reception control unit 50. Note that the prediction system 9 may be provided in the measurement head controller 46.
The distance calculation unit 49 calculates the distance D from the measurement head 8 to the workpiece 9 based on the two-dimensional image data generated by the CCD camera 45. This distance D is a distance in the central axis CL direction (that is, the Z-axis direction) between the measurement point S on the workpiece 9 and the imaging surface 51 of the CCD camera 45.
The transmission / reception control unit 50 performs processing for transmitting / receiving commands and data to / from the transmission / reception unit 22 via the wireless device 48. That is, when the signal F of the measurement command f is transmitted from the transmission / reception unit 22, the measurement command f is transmitted to the transmission / reception control unit 50 via the radio device 48.

When receiving the measurement command f, the transmission / reception control unit 50 actively advances the time difference n set in advance by the prediction system 29 provided in the measurement head 8 at a predetermined time interval ΔT at a predetermined time interval ΔT. , A signal to start the measurement operation is output to the CCD camera 45 or the like.
Then, the laser oscillator 40 generates laser light L, and this laser light L is irradiated onto the workpiece 9. The laser light L diffusely reflected at the measurement point S on the workpiece 9 is photographed by the CCD camera 45, and two-dimensional image data is generated based on the photographed data.
The distance calculation unit 49 calculates the distance D based on the two-dimensional image data. Then, the transmission / reception control unit 50 performs a process of transmitting the measurement data signal F including the distance D calculated by the distance calculation unit 49 to the transmission / reception unit 22 via the wireless device 48.

In the present embodiment, the signal F of the measurement command f is transmitted from the transmission / reception unit 22 to the measurement head 8 wirelessly. When the measuring head 8 receives this measurement command f, the distance D from the measuring head 8 to the workpiece 9 at a constant time interval ΔT at a timing that is positively advanced by a time difference n set in advance by the prediction system 29. Is measured without contact.
The measuring head 8 is automatically exchanged and mounted on the spindle 4 of the machine tool 1 by the ATC 14. During the measuring operation, the measuring head 8 does not contact the workpiece 9. Therefore, the workpiece 9 can be scanned over a wide range in a short time by scanning the measuring head 8 at high speed safely and without vibration or with low vibration.

Next, the principle of the present invention will be described.
In FIG. 1, FIG. 2, and FIG. 5, the premise of this invention is the case where the prediction system 29 is not provided and the following two conditions 1 and 2 are satisfied. The horizontal axis of the waveform diagram shown in FIG.

(Condition 1): It is assumed that the pulse output unit 24 of the transmission / reception unit 22 outputs a timing pulse Pa for obtaining position data from the NC device 13 to the controller 25 at regular time intervals ΔT. Then, it is assumed that the controller 25 reads and acquires the position data of the measuring head 8 from the NC device 13 at time t1 according to the timing pulse Pa.
(Condition 2): The transmission / reception unit 22 outputs the timing pulse Pa from the pulse output unit 24 to the controller 25, and at the same time outputs a measurement command f to the measurement head 8 at regular time intervals ΔT. It is assumed that the time interval ΔT is the same as the pulse interval ΔT of the timing pulse Pa.

When the transmission / reception unit 22 outputs the measurement command f at time t 1, a wireless signal F is transmitted to the measurement head 8. At a time t2 immediately after the measurement command f reaches the measurement head 8 by the wireless signal F, the measurement head 8 measures the distance D to the workpiece 9 based on the measurement command f.
In the path through which the measurement command f flows, there is a processing by the wireless signal F and the measurement head 8. It takes a long “delay time”.

The delay time Δn from when the measurement command f is output from the transmission / reception unit 22 to the measurement head 8 at time t1 and until the distance D is measured by the measurement head 8 at time t2 is expressed by the following equation. Is calculated by

Δn = t2 -t1 (1)

On the other hand, the controller 25 reads and acquires the position data of the measuring head 8 from the NC device 13 at time t1 according to the timing pulse Pa.
That is, the controller 25 acquires data on the position of the measuring head 8 in at least two axial directions with respect to the measurement point S on the workpiece 9 at time t1. In this embodiment, position data X, Y, and Z in the three orthogonal axes directions are acquired.
Since the controller 25 is built in the NC device 13 and the timing pulse Pa output from the pulse output unit 24 is output to the controller 25 via the cable 60, the delay time is extremely short. Therefore, the controller 25 immediately acquires the position data of the measuring head 8 from the NC device 13 according to the signal of the timing pulse Pa at time t1.

The delay time Δn when the measuring head 8 measures the distance D to the workpiece 9 and the delay time when the controller 25 acquires the position data of the measuring head 8 in the three orthogonal axes directions (in this case, almost zero) The time difference n, which is a predetermined parameter, can be calculated by the following equation.

n = Δn −0 (2)

Thus, the time difference n is calculated based on FIG. 5 and the above equation (2). This time difference n is a unique value in the system in which the measuring head 8 is mounted on the machine tool 1. Therefore, unless the machine tool 1 and the measuring head 8 are partially modified or replaced, the system-specific time difference n is theoretically a constant value.
Therefore, after installing the machine tool 1 and specifying the measuring head 8 to be used, the time difference n is set by one test operation. Depending on the user of the machine tool 1, the time difference n may be confirmed and changed once or a plurality of times each time the machining condition for the workpiece 9 changes or the type of the workpiece 9 changes. In this way, a more accurate time difference n is set.

Next, the workpiece measuring apparatus 20 in which the prediction system 29 is provided in the measuring head 8 will be described.
As shown in FIGS. 1, 2, and 6, the transmission / reception unit 22 outputs a timing pulse P from the pulse output unit 24 to the controller 25, and at the same time, sends a measurement command f to the measurement head 8 at regular time intervals ΔT. Output. The timing pulse P output from the pulse output unit 24 has a fixed time interval ΔT. The horizontal axis of the waveform diagram shown in FIG. 6 is time t.
When the controller 25 receives the timing pulse P, the controller 25 reads and acquires the position data of the measuring head 8 from the NC device 13 at regular time intervals ΔT.
On the other hand, the transmission / reception unit 22 transmits the signal F of the measurement command f to the measurement head 8. When receiving the measurement command f, the measuring head 8 receives the measurement command f at a predetermined time interval ΔT at a timing positively advanced by the time difference n set in advance by the prediction system 29 provided in the measuring head 8. 9 is measured. The time difference n is preset by the predictive system 29, and is and stored in the prediction system 29.
As a result, the first time T1 when the controller 25 acquires the position data of the measuring head 8 and the second time T2 when the measuring head 8 measures the workpiece 9 are made to coincide (reference numeral in FIG. 6). H).

Next, a procedure for measuring the workpiece 9 with the workpiece measuring device 20 will be described.
First of all, the measurement head 8 is called by the measurement program. The measuring head 8 is mounted on the spindle 4 by the ATC 14 and positioned at the starting point of measurement (scanning).
Next, according to the M code command in the measurement program, the control device 23 outputs a measurement start command. Then, the NC device 13, the controller 25, the control device 23, the transmission / reception unit 22, and the like are in a measurement preparation state. The measuring head 8 starts to move above the workpiece 9 according to the movement command of the measurement program.

The transmission / reception unit 22 outputs the timing pulse P from the pulse output unit 24 to the controller 25 via the cable 60 every fixed time interval ΔT (16 [msec]), and at the same time, the measurement command f every fixed time interval ΔT. Is output to the measuring head 8.
When the pulse output unit 24 outputs the first pulse signal Po, the controller 25 performs a reading operation (acquisition operation) at the first time T1. In other words, when the controller 25 receives the timing pulse P, the axis (X, Y, Z axes) of the measuring head 8 from the NC device 13 is set at regular time intervals ΔT (16 [msec]) according to the first signal Pb. ) Current position information 53, 54, 55 (position data) is read. Then, the position data is sequentially stored in the buffer memory 16 as data at the first time T1.

The transmission / reception unit 22 outputs a measurement command f to the measurement head 8 at regular time intervals ΔT. At this time, the timing pulse P is used to synchronize the timing of the measurement command f so as not to cause a time lag. That is, the timing gradually shifts after a long time has elapsed, but the timing pulse P prevents the occurrence of this time shift.
Since the measurement command f of the transmission / reception unit 22 is transmitted as a signal F by radio, it is input to the measurement head 8 with a slight delay.
When the measurement head 8 receives the measurement command f from the transmission / reception unit 22, the measurement head 8 is positively advanced by the time difference n set in advance by the prediction system 29 provided in the measurement head 8. 9 measurement operation is started. Thereafter, the transmission / reception unit 22 transmits a measurement command f to the measurement head 8 at regular time intervals ΔT at a timing that is positively advanced by a time difference n set in advance by the prediction system 29.

That is, the measurement head 8 measures the distance D from the measurement head 8 to the workpiece 9 and returns the measurement result (measurement data) to the transmission / reception unit 22. At this time, the signal F of the measurement command f output from the transmission / reception unit 22 is transmitted to the measurement head 8 wirelessly and processed in the measurement head 8. After the time Δn1 required for the wireless transmission and the processing in the measuring head 8 has elapsed, the measuring head 8 measures the distance D at the second time T2 in accordance with the measurement command f.
In this case, the above-described time difference is predicted by the prediction system 29 so that the timing at which the controller 25 reads the position data C1 of the measuring head 8 and the timing at which the measuring head 8 measures the distance D coincide (reference numeral H in FIG. 6). n is preset and stored.
As a result, the first time T1 and the second time T2 become the same time. The measurement operation by the measurement head 8 and the position data reading operation by the controller 25 are repeatedly performed at the same timing.

The transmission / reception unit 22 transmits the measurement data B 1 received from the measurement head 8 to the control device 23. The measurement data B1 is sequentially stored in the measurement data storage unit 21.
Each time the controller 25 reads the position data of the measuring head 8 from the NC device 13 and additionally stores it in the buffer memory 16, the controller 25 increments the value of the memory address counter (latest address counter) 38 in the controller 25. The address written last is held in the buffer memory 16.

  The control device 23 sequentially reads a series of position data C 1 stored in the buffer memory 16 and sequentially stores it in the position data storage unit 26 in the control device 23. At this time, the start address of a series of position data to be read in the buffer memory 16 is held in the start address memory (start address counter) 37 of the control device 23, and the start address memory (start address) is read each time the position data is read. The value of the counter 37 is updated. The final address of a series of position data to be read is indicated by a memory address counter (latest address counter) 38 in the controller 25.

  Thus, from the step “the transmission / reception unit 22 outputs the timing pulse P from the pulse output unit 24 and simultaneously outputs the measurement command f to the measurement head 8”, the “control device 23 stores the series stored in the buffer memory 16. Position data C1 is sequentially read and stored in the position data storage unit 26. At this time, the start address memory 37 of the control device 23 holds the start address of a series of position data to be read in the buffer memory 16. Every time the position data is read, the value in the start address memory 37 is updated "step is repeated.

When an M code command in the program is output, the control device 23 outputs a measurement end command to the controller 25 and the transmission / reception unit 22. Then, the measurement by the workpiece measuring device 20 is finished, and the pulse output unit 24 finishes outputting the pulse signal of the timing pulse P.
Then, the first position data is deleted from the series of position data C 1 stored in the position data storage unit 26 in the control device 23. This is because there is no measurement data corresponding to the first position data at the start of measurement.
Further, the last one measurement data is deleted from the series of measurement data B 1 stored in the measurement data storage unit 21 in the control device 23. This is because there is no position data corresponding to the last measurement data.
Next, the arithmetic processing unit 27 calculates the two-dimensional shape data or the three-dimensional shape data of the workpiece 9 by combining the position data and the measurement data at each time point.

In the present invention, the transmission / reception unit 22 and the control device 23 may process the minimum necessary measurement data B1. Therefore, the data processing load is reduced, and the memory capacities of the measurement data storage unit 21 and the position data storage unit 26 can be reduced.
Since the NC memory 13 is provided with the buffer memory 16, the position data C1 of the measuring head 8 in the three orthogonal axes directions (X-axis direction, Y-axis direction, Z-axis direction) can be temporarily stored in the buffer memory 16.
Thereafter, in accordance with a command output from the start address memory (start address counter) 37 and a command from the memory address counter (latest address counter) 38, a plurality of position data C1 can be collectively stored in the position data storage unit 26. it can. Therefore, the burden for the controller 25, the buffer memory 16 and the control device 23 to process the position data C1 can be reduced.

The arithmetic processing unit 27 is based on the minimum necessary measurement data B1 stored in the measurement data storage unit 21 and the position data C1 in the three orthogonal directions of the measurement head 8 stored in the position data storage unit 26. To perform the operation. Thereby, the two-dimensional shape data or the three-dimensional shape data of the workpiece 9 is obtained.
In this way, data (two-dimensional shape data or three-dimensional shape data) of each coordinate of a large number of measurement points S on the workpiece 9 is calculated. The data of the coordinates of the large number of points to be measured S are output to an arithmetic device (for example, a personal computer) 28 provided separately from the control device 23. The calculation device 28 performs a calculation for collecting the coordinates of a large number of points to be measured S. Thereby, a three-dimensional view of the workpiece 9, that is, a three-dimensional shape E (FIG. 7) is obtained.

  FIG. 8 is calculated based on the data of the measurement distance D input from the transmission / reception unit 22 and the controller 25 to the control device 23, the position data C1 in the three orthogonal directions, and the data of the measurement distance D and the position data C1. The results are shown. This calculation result is three-dimensional shape data (that is, the coordinates of the measurement point S on the workpiece 9).

As described above, in the workpiece measuring apparatus 20 of the present invention, when the measurement head 8 receives the measurement command f from the transmission / reception unit 22, the measurement head 8 is active only by the time difference n set in advance by the prediction system 29 of the measurement head 8. The workpiece 9 is measured at regular time intervals ΔT at an earlier timing.
As a result, the first time T1 when the controller 25 acquires the position data of the measuring head 8 and the second time T2 when the measuring head 8 measures the workpiece 9 according to the measurement command f are synchronized.

Thereby, the control device 23 performs arithmetic processing based on the position data C1 of the measuring head 8 in the three orthogonal axes directions and the minimum necessary measurement data B1. Therefore, two-dimensional shape data or three-dimensional shape data of the workpiece 9 can be obtained. As a result, a highly accurate two-dimensional shape or three-dimensional shape of the workpiece 9 is obtained.
The measuring head 8 measures the workpiece 9 without contact. Therefore, after the measuring head 8 is automatically exchanged and mounted on the spindle 4 of the machine tool 1, the measuring head 8 is scanned at high speed safely and without vibration or with low vibration, and the workpiece 9 is scanned for a short time. Can measure a wide range.

  In the above description, the pulse output unit 24 outputs the timing pulse P at a pulse interval of 16 [msec]. Since this timing pulse P is used to check the timing of data acquisition, the pulse interval and the measurement interval are not limited and may be arbitrary values.

Regarding the end of the measurement by the workpiece measuring device 20, if the pulse signal of the timing pulse P is not input to the controller 25 at a preset pulse interval (16 [msec]), the controller 25 determines that the measurement is ended.
By the way, in this determination method, it is assumed that the pulse interval is a long value (for example, 160 [msec]). In this case, even if the transmission / reception unit 22 receives the measurement end command from the control device 23, the controller 25 does not until the controller 25 recognizes that the timing pulse P does not come after a long time of 160 [msec]. The position data C1 is acquired and continuously output to the control device 23. As a result, the position data C1 acquired by the control device 23 immediately before the end of measurement is wasted.
Therefore, the control device 23 preferably transmits a measurement end command not only to the transmission / reception unit 22 but also to the controller 25, and ends the measurement when the controller 25 receives the command. In this way, there is no inconvenience that the control device 23 acquires unnecessary data immediately before the end of the measurement and causes waste.

FIG. 9 is a schematic configuration diagram of a workpiece measuring apparatus 20a according to another example in which the prediction system 29 is provided in the transmission / reception unit 22, and FIG. 10 is a block diagram of the measuring head 8a shown in FIG. In addition, description of the same structure as the workpiece measuring apparatus 20 is abbreviate | omitted, and a different structure is demonstrated.
As shown in FIGS. 1, 9, and 10, the workpiece measuring device 20 a and the workpiece measuring method using the workpiece measuring device 20 a are provided by a measuring head 8 a that is detachably attached to the spindle 4 of the machine tool 1. Can be measured without contact (or in contact).
The workpiece measuring device 20a includes an NC device 13, a measuring head 8a that is detachably mounted on the spindle 4 of the machine tool 1, and a workpiece receiving device 22a that transmits and receives between the measuring head 8a. And a control device 23 for controlling the workpiece measuring device 20a. The prediction system 29 is provided in the transmission / reception unit 22a, and is not provided in the measurement head 8a.

The workpiece measuring device 20a further includes a controller 25 and a pulse output unit 24. The transmission / reception unit 22 a includes a clock 17, a pulse output unit 24, and a prediction system 29. Note that the prediction system 29 may be provided separately from the transmission / reception unit 22a.
The pulse output unit 24 outputs a timing pulse P having a pulse interval ΔT corresponding to a certain time interval ΔT of the clock 17 to the controller 25 via the cable 60. The timing pulse P is used to adjust the timing in the transmission / reception unit 22a.
When measuring the workpiece 9 with the workpiece measuring device 20 a, the transmission / reception unit 22 a outputs the timing pulse P from the pulse output unit 24 to the controller 25 via the cable 60. At the same time, the transmission / reception unit 22a generates a measurement command f every certain time interval ΔT. The measurement command f is a command that matches the timing of the timing pulse P.
When the controller 25 receives the timing pulse P, the controller 25 reads and acquires the position data of the measuring head 8 from the NC device 13 at regular time intervals ΔT.

Between the transmission / reception unit 22a and the measurement head 8a attached to the spindle 4, a signal F such as a measurement command f or measurement data is transmitted and received wirelessly.
The measuring head 8a measures the workpiece 9 at regular time intervals ΔT according to the received measurement command f. The measurement command f is sent earlier than the timing of the constant time interval ΔT by the time difference n set in advance by the prediction system 29 provided in the transmission / reception unit 22a and in accordance with the timing of the timing pulse P. To the measurement head 8a.
In this case, the measuring head 8a measures the distance D from the measuring head 8a to the workpiece 9. The measured data signal F is wirelessly transmitted from the measurement head 8a to the transmission / reception unit 22a. The measurement data B1 received by the transmission / reception unit 22a from the measurement head 8a is output to the control device 23.
As a result, the first time T1 when the controller 25 reads and acquires the position data C1 of the measuring head 8a and the second time T2 when the measuring head 8a measures the workpiece 9 according to the measurement command f are matched. (See symbol H in FIG. 6).
The first time T1 is a time for the controller 25 to acquire the position data of at least two axial directions of the measuring head 8a with respect to the measurement point S on the workpiece 9 from the NC device 13 at regular time intervals ΔT. .
The second time T2 is a time during which the measuring head 8a measures the distance D from the measuring head 8a to the workpiece 9 at regular time intervals ΔT.

Thereby, the operation of acquiring the position data C1 by the controller 25 and the operation of measuring the workpiece 9 by the measuring head 8a at that time are always at the same timing (that is, simultaneously) at regular time intervals ΔT. Repeatedly.
That is, the controller 25 reads and acquires position data C1 of at least two axial directions (Z-axis direction and X-axis direction) of the measuring head 8a with respect to the measurement point S on the workpiece 9 from the NC device 13.
Simultaneously with the operation of the controller 25 and at regular time intervals ΔT, the measuring head 8a measures the distance D from the measuring head 8a to the workpiece 9 at that time.

The position data C1 of the measuring head 8a acquired by the controller 25 is output to the control device 23. Further, the transmission / reception unit 22a transmits the measurement command f to the measurement head 8a, and then outputs the measurement data B1 received from the measurement head 8a to the control device 23.
The control device 23 obtains two-dimensional shape data or three-dimensional shape data of the workpiece 9 by performing calculations based on the position data C1 and the measurement data B1.

The controller 25 has a buffer memory 16 for temporarily storing the position data C1 of the measuring head 8a read from the NC device 13. When the controller 25 acquires the position data C1 of the measuring head 8a, the controller 25 temporarily stores the position data C1 in the buffer memory 16 and then outputs the position data C1 from the buffer memory 16 to the control device 23.
The control device 23 sequentially stores the measurement data B1 sent from the transmission / reception unit 22a in the measurement data storage unit 21.
The prediction system 29 of the transmission / reception unit 22a positively advances the measurement command f for the measurement head 8 by a time difference n set in advance by the prediction system 29. Thus, the operation of acquiring the position data C1 by the controller 25 and the operation of measuring the workpiece 9 by the measuring head 8a at that time are always repeated at the same timing (that is, simultaneously) at regular time intervals ΔT. It is done.
According to the workpiece measuring apparatus 20a having the above-described configuration and the workpiece measuring method using the apparatus 20a, the same effects as the workpiece measuring apparatus 20 and the method thereof can be obtained.

Next, a modification of the present embodiment will be described.
The machine tool according to the modified example in which the workpiece measuring device 20 (or the workpiece measuring device 20a) of the present invention is provided is configured so that the measuring head 8 (or the measuring head 8a) and the workpiece are relatively orthogonal to each other in three axial directions. Is a processing machine that performs three-axis control for linear movement and at least one-axis control (for example, B-axis control) for indexing by relatively turning the measurement heads 8 and 8a and the workpiece.
If the workpiece measuring devices 20 and 20a are provided in the machine tool, the measuring heads 8 and 8a and the workpiece can be relatively rotated. Therefore, the upper surface, the side surface and the inclined surface of the workpiece can be freely measured by the measuring heads 8 and 8a, and the workpiece can be measured two-dimensionally or three-dimensionally in a wide range.

11 to 12F are diagrams for explaining a modification of the present embodiment. FIG. 11 is a perspective view of another machine tool 101 provided with the workpiece measuring devices 20 and 20a, and FIGS. 12A to 12F are explanatory diagrams showing a workpiece measuring state.
A machine tool 101 shown in FIG. 11 is a 5-axis machine, which is a multi-task machine capable of turning at least the workpieces 9, 9x based on a 5-axis control vertical machining center.
The 5-axis control machine tool 101 includes three-axis control for linearly moving the measurement heads 8 and 8a and the workpieces 9 and 9x in three orthogonal directions of the X, Y, and Z axes, and the measurement head 8 , 8a and the workpieces 9, 9x are at least one-axis controlled (in this example, two-axis control consisting of B-axis control and C-axis control) to perform rotation.

The machine tool 101 includes a base body 102 , a column 103 installed on the base body 102 , a cross rail 107 installed on the column 103, and a spindle head 105 attached to the cross rail 107 and having a spindle 104. Yes. The machine tool 101 is controlled by the NC device 13 (FIGS. 2 and 9).
The column 103 is disposed on the base 102 and is movable in the front-rear horizontal direction (Y-axis direction). The cross rail 107 is disposed on the column 103 and is movable in the left and right horizontal direction (X-axis direction). The spindle head 105 is supported by the cross rail 107 and is movable in the vertical direction (Z-axis direction). Three orthogonal axes are constituted by the X, Y, and Z axes orthogonal to each other.
A tool (not shown) or the measurement heads 8 and 8a are detachably attached to the tip of the main shaft 104. The main shaft 104 is supported by the main shaft head 105 so that its center axis is parallel to the Z axis and is rotatable about the center axis.

The column 103 arranged on the base body 102 is driven by the Y-axis feed mechanism and moves in the Y-axis direction. The cross rail 107 disposed on the column 103 is driven by the X-axis feed mechanism and moves in the X-axis direction. The spindle head 105 supported by the cross rail 107 is driven by the Z-axis feed mechanism and moves in the Z-axis direction.
As a result, the measuring heads 8 and 8a linearly move relative to the workpieces 9 and 9x in the three orthogonal directions of the X, Y, and Z axes.

The machine tool 101 includes a table 106 that can be turned by B-axis control and that can be rotated by C-axis control. The table 106 can be indexed by rotating the workpieces 9 and 9x relative to the measuring heads 8 and 8a by B-axis control and C-axis control. The B axis is parallel to the Y axis direction, and the C axis is the rotation center of the table 106.
Note that the spindle head may turn relative to the table 106 by B-axis control and C-axis control.

As shown by an arrow K, the base 102 is provided with a turning plate 109 that turns by B-axis control. A table support 110 that protrudes forward from the revolving plate 109 and supports the table 106 is fixed to the revolving plate 109.
The table drive device has a B-axis drive device 111 for turning the table 106 by B-axis control, and a C-axis drive device 112 for rotating the table 106 by C-axis control.
By driving the B-axis drive device 111, the swivel plate 109, the table support 110, the table 106, the workpieces 9, 9x, and the like are swung by the B-axis control and indexed to predetermined positions.
By driving the C-axis drive device 112, the table 106 to which the workpieces 9, 9x are attached is indexed by a desired angle rotation by the C-axis control, and can be continuously rotated.

At the time of turning, when the C-axis driving device 112 is driven, the table 106 and the workpieces 9 and 9x are rotated by the C-axis control. Thus, if the workpieces 9 and 9x are rotated at a predetermined rotational speed by the C-axis control while the workpieces 9 and 9x are placed on the table 106, the workpieces 9 and 9x are moved to the spindle 104. It is turned by the installed turning tool.
On the other hand, when a rotary tool is mounted on the spindle 104 and cutting is performed with this rotary tool, the C-axis drive device 112 is controlled, and the workpieces 9 and 9x on the table 106 are moved by the C-axis drive device 112. Index to a predetermined position by C-axis control. In this state, the workpieces 9 and 9x placed on the table 106 are cut by the rotary tool of the main shaft 104.

The workpiece measuring devices 20 and 20a provided in the machine tool 101 have the same configuration as the workpiece measuring devices 20 and 20a provided in the machine tool 1.
The workpiece measuring devices 20 and 20a in the machine tool 101 and the workpiece measuring method using the workpiece measuring device 20 and 20a can be brought into contact with the workpieces 9 and 9x by the measuring heads 8 and 8a that are detachably mounted on the spindle 104 (or Measurable).

For example, when the workpiece 9 is rectangular, as shown in FIG. 12A, the B-axis driving device 111 and the C-axis driving device 112 are controlled to position the table 106 horizontally. Thus, when the workpiece 9 is not turning, the upper surface 9a of the workpiece 9 on the table 106 can be measured with the measuring heads 8 and 8a.
Next, the B-axis drive device 111 is driven, and the turning plate 109, the table support 110, the table 106, and the workpiece 9 are moved from the state shown in FIG. 12A to +90 degrees by B-axis control as shown in FIG. 12B. Turn and index. Then, the first side surface 9b of the workpiece 9 on the table 106 can be measured with the measuring heads 8 and 8a.

  Further, by driving the B-axis drive device 111, the swivel plate 109, the table support 110, the table 106, and the workpiece 9 are changed from the state shown in FIG. 12A to +270 degrees by B-axis control as shown in FIG. 12C. Turn and index. Then, the second side surface 9c (the side surface opposite to the first side surface 9b) of the workpiece 9 on the table 106 can be measured by the measurement heads 8 and 8a.

  In the state shown in FIG. 12B or FIG. 12C, the C-axis drive device 112 is driven, and the swivel plate 109, the table support 110, the table 106, and the workpiece 9 are controlled as shown in FIG. 12D. Turn 90 degrees to find out. Then, the measurement heads 8 and 8a can measure the third side surface 9d (the side surface perpendicular to the first side surface 9b and the second side surface 9c) of the workpiece 9 on the table 106.

The machine tool 101 performs B-axis control for turning and indexing a workpiece. As a result, as shown in FIGS. 12E and 12F, even when the workpiece 9x has the inclined surface 9e, the measuring heads 8 and 8a are relatively inclined with respect to the center axis CL. Can be measured.
For example, in the workpiece measurement state shown in FIG. 12E, the table 106 is positioned horizontally without turning by the B-axis control. As indicated by the arrow M, the measuring heads 8 and 8a are moved along the inclined surface 9e of the workpiece 9x. Thus, the measurement heads 8 and 8a perform measurement while irradiating the laser beam L obliquely relative to the inclined surface 9e.
Next, in the workpiece measurement state shown in FIG. 12F, the table 106 is turned by the B-axis drive device 111 by the B-axis control, and the entire workpiece 9x is directed obliquely so that the inclined surface 9e is horizontal. Then, the measurement heads 8 and 8a perform measurement while irradiating the inclined surface 9e with the laser beam L at a right angle.

If the workpiece measuring devices 20 and 20a are provided in the 5-axis control machine tool 101 in this way, the side surfaces 9b, 9c and 9d, the inclined surface 9e and the like in addition to the upper surface 9a of the workpieces 9 and 9x are measured heads. The workpiece 9, 9x can be measured two-dimensionally or three-dimensionally in a wider range by freely measuring with 8,8a.
The workpiece measuring devices 20 and 20a provided in the machine tool 101 also have the same effects as the workpiece measuring devices 20 and 20a provided in the machine tool 1.

Although the embodiments of the present invention (including modifications, the same applies hereinafter) have been described above, the present invention is not limited to the above-described embodiments, and various modifications and additions can be made within the scope of the present invention. Is possible.
In the drawings, the same reference numerals denote the same or corresponding parts.

  The workpiece measuring apparatus and method for a machine tool according to the present invention can be applied to machine tools such as lathes, lathes, and grinders in addition to a machining center and a multi-tasking machine. The workpiece can be measured.

1 Machine tool (vertical machining center)
4,104 Spindle 8,8a Measuring head 9,9x Work piece 13 NC device 14 Automatic tool changer 16 Buffer memory 20, 20a Work piece measuring device 21 Measurement data storage unit 22, 22a Transmission / reception unit 23 Control device 24 Pulse output unit 25 Programmable Controller 26 Position Data Storage Unit 27 Arithmetic Processing Unit 29 Prediction System 37 Start Address Memory 38 Memory Address Counter 101 Machine Tool (5-axis Machine)
B1 Measurement data C1 Position data CL Center axis D Distance f Measurement command n Time difference P Timing pulse S Measurement point S1 Measurement head orthogonal 3-axis position T1 First time T2 Second time X-axis direction Second-axis direction Z axis direction First axis direction ΔT Fixed time interval

Claims (12)

An NC device that controls a machine tool, a measurement head that is detachably attached to the spindle of the machine tool, measures a workpiece, a transmission / reception unit that transmits and receives between the measurement head, and a workpiece measurement device A control device for controlling the workpiece, the device measuring the workpiece,
This workpiece measuring device
Including the of the measuring head against the measured point on the workpiece, and a second axial measuring head scans the first axial Toko this measuring head is to measure the distance to the workpiece A programmable controller for acquiring at least two axial position data from the NC device at regular time intervals;
A pulse output unit that is provided in the transmission / reception unit and outputs a timing pulse having a pulse interval corresponding to the fixed time interval;
The transmission / reception unit outputs the timing pulse from the pulse output unit to the programmable controller, and at the same time outputs a measurement command to the measurement head at every certain time interval,
When the programmable controller receives the timing pulse, the programmable controller obtains the position data of the measuring head at every certain time interval,
When the measurement head receives the measurement command, the measurement head measures the workpiece at the predetermined time intervals at a timing that is positively advanced by a time difference set in advance by a prediction system provided in the measurement head,
As a result, the first time for the programmable controller to acquire the position data of the measuring head and the second time for the measuring head to measure the workpiece are matched with each other. Workpiece measuring device. An NC device that controls a machine tool, a measurement head that is detachably attached to the spindle of the machine tool, measures a workpiece, a transmission / reception unit that transmits and receives between the measurement head, and a workpiece measurement device A control device for controlling the workpiece, the device measuring the workpiece,
This workpiece measuring device
Including the of the measuring head against the measured point on the workpiece, and a second axial measuring head scans the first axial Toko this measuring head is to measure the distance to the workpiece A programmable controller for acquiring at least two axial position data from the NC device at regular time intervals;
A pulse output unit that is provided in the transmission / reception unit and outputs a timing pulse having a pulse interval corresponding to the fixed time interval;
The transmission / reception unit outputs the timing pulse from the pulse output unit to the programmable controller, and at the same time generates a measurement command for each certain time interval,
When the programmable controller receives the timing pulse, the programmable controller obtains the position data of the measuring head at every certain time interval,
The measurement head is positively advanced from the timing of the certain time interval by the time difference set in advance by a prediction system provided in the transmission / reception unit and is synchronized with the timing of the timing pulse from the transmission / reception unit. According to the measurement command output to the measuring head, the workpiece is measured at every certain time interval,
As a result, the first time for the programmable controller to acquire the position data of the measuring head and the second time for the measuring head to measure the workpiece according to the measurement command are matched. Workpiece measuring device for machine tools. An NC device that controls a machine tool, a measurement head that is detachably attached to the spindle of the machine tool, measures a workpiece, a transmission / reception unit that transmits and receives between the measurement head, and a workpiece measurement device A control device for controlling the workpiece, the device measuring the workpiece,
This workpiece measuring device
Including the of the measuring head against the measured point on the workpiece, and a second axial measuring head scans the first axial Toko this measuring head is to measure the distance to the workpiece A programmable controller for acquiring at least two axial position data from the NC device at regular time intervals;
A pulse output unit that is provided in the transmission / reception unit and outputs a timing pulse having a pulse interval corresponding to the fixed time interval;
The transmission / reception unit outputs the timing pulse from the pulse output unit to the programmable controller, and at the same time outputs a measurement command to the measurement head at every certain time interval,
When the programmable controller receives the timing pulse, the programmable controller obtains the position data of the measuring head at every certain time interval,
When the measurement head receives the measurement command, the measurement head measures the workpiece at the predetermined time intervals at a timing that is positively advanced by a time difference set in advance by a prediction system provided in the measurement head,
As a result, a first time when the programmable controller acquires the position data of the measuring head and a second time when the measuring head measures the workpiece are matched, and the position by the programmable controller is set. The operation of acquiring data and the operation of measuring the workpiece by the measuring head at that time point are always repeated at the same timing at the predetermined time intervals,
Outputting the position data of the measuring head acquired by the programmable controller to the control device;
The transmission / reception unit transmits the measurement command to the measurement head, and then outputs the measurement data received from the measurement head to the controller.
The control apparatus is configured to obtain two-dimensional shape data or three-dimensional shape data of the workpiece by performing an operation based on the position data and the measurement data. measuring device. An NC device that controls a machine tool, a measurement head that is detachably attached to the spindle of the machine tool, measures a workpiece, a transmission / reception unit that transmits and receives between the measurement head, and a workpiece measurement device A control device for controlling the workpiece, the device measuring the workpiece,
This workpiece measuring device
Including the of the measuring head against the measured point on the workpiece, and a second axial measuring head scans the first axial Toko this measuring head is to measure the distance to the workpiece A programmable controller for acquiring at least two axial position data from the NC device at regular time intervals;
A pulse output unit that is provided in the transmission / reception unit and outputs a timing pulse having a pulse interval corresponding to the fixed time interval;
The transmission / reception unit outputs the timing pulse from the pulse output unit to the programmable controller, and at the same time generates a measurement command for each certain time interval,
When the programmable controller receives the timing pulse, the programmable controller obtains the position data of the measuring head at every certain time interval,
The measurement head is positively advanced from the timing of the certain time interval by the time difference set in advance by a prediction system provided in the transmission / reception unit and is synchronized with the timing of the timing pulse from the transmission / reception unit. According to the measurement command output to the measuring head, the workpiece is measured at every certain time interval,
As a result, the programmable controller matches the first time when the position data of the measuring head is acquired and the second time when the measuring head measures the workpiece according to the measurement command. The operation of acquiring the position data by the controller and the operation of measuring the workpiece by the measuring head at that time are always repeated at the same timing at the predetermined time intervals.
Outputting the position data of the measuring head acquired by the programmable controller to the control device;
The transmission / reception unit transmits the measurement command to the measurement head, and then outputs the measurement data received from the measurement head to the controller.
The control apparatus is configured to obtain two-dimensional shape data or three-dimensional shape data of the workpiece by performing an operation based on the position data and the measurement data. measuring device. The programmable controller has a buffer memory for temporarily storing the position data of the measuring head,
5. The programmable controller, when acquiring the position data of the measuring head, temporarily stores the position data in the buffer memory, and then outputs the position data from the buffer memory to the control device. The workpiece measuring apparatus in the machine tool as described in any one of the above items. The controller is
A measurement data storage unit for storing the measurement data;
The position data acquired by the programmable controller and stored in the buffer memory are sequentially sequentially according to a command of a start address memory provided in the control device and a command of a memory address counter provided in the buffer memory. A position data storage unit for reading and storing the position data thus read;
6. The workpiece measuring apparatus for a machine tool according to claim 5, further comprising an arithmetic processing unit that performs an operation based on the measurement data and the position data. The measuring head receives the measurement command, by measuring the distance to the workpiece from the measuring head, any of claims 1 to 6, characterized in that measuring the workpiece in noncontact A workpiece measuring device for a machine tool according to any one of the above items. The measuring head is automatically changed with respect to the spindle by an automatic tool changer,
Providing a step of measuring the workpiece with the measuring head attached to the spindle during or after the machining step of machining the workpiece with a tool attached to the spindle;
8. The workpiece measuring apparatus for a machine tool according to claim 1, wherein the machining operation and the measuring operation are successively performed in the order or in the reverse order. A method of measuring a workpiece with a measuring head that is detachably mounted on a spindle of a machine tool,
The workpiece measuring device used in this method is
An NC device for controlling the machine tool;
The measuring head that is detachably mounted on the spindle of the machine tool and measures the workpiece;
A transmission / reception unit that performs transmission / reception with the measurement head;
A control device for controlling the workpiece measuring device;
Including the of the measuring head against the measured point on the workpiece, and a second axial measuring head scans the first axial Toko this measuring head is to measure the distance to the workpiece A programmable controller for acquiring at least two axial position data from the NC device at regular time intervals;
A pulse output unit that is provided in the transmission / reception unit and outputs a timing pulse having a pulse interval corresponding to the fixed time interval;
The workpiece measuring method by the workpiece measuring device is:
The transmission / reception unit outputs the timing pulse from the pulse output unit to the programmable controller, and at the same time outputs a measurement command to the measurement head at every certain time interval,
When the programmable controller receives the timing pulse, the programmable controller obtains the position data of the measuring head at every certain time interval,
When the measurement head receives the measurement command, the measurement head measures the workpiece at the predetermined time intervals at a timing that is positively advanced by a time difference set in advance by a prediction system provided in the measurement head,
As a result, the first time for the programmable controller to acquire the position data of the measuring head and the second time for the measuring head to measure the workpiece are matched with each other. Workpiece measuring method. A method of measuring a workpiece with a measuring head that is detachably mounted on a spindle of a machine tool,
The workpiece measuring device used in this method is
An NC device for controlling the machine tool;
The measuring head that is detachably mounted on the spindle of the machine tool and measures the workpiece;
A transmission / reception unit that performs transmission / reception with the measurement head;
A control device for controlling the workpiece measuring device;
Including the of the measuring head against the measured point on the workpiece, and a second axial measuring head scans the first axial Toko this measuring head is to measure the distance to the workpiece A programmable controller for acquiring at least two axial position data from the NC device at regular time intervals;
A pulse output unit that is provided in the transmission / reception unit and outputs a timing pulse having a pulse interval corresponding to the fixed time interval;
The workpiece measuring method by the workpiece measuring device is:
The transmission / reception unit outputs the timing pulse from the pulse output unit to the programmable controller, and at the same time generates a measurement command for each certain time interval,
When the programmable controller receives the timing pulse, the programmable controller obtains the position data of the measuring head at every certain time interval,
The measurement head is positively advanced from the timing of the certain time interval by the time difference set in advance by a prediction system provided in the transmission / reception unit and is synchronized with the timing of the timing pulse from the transmission / reception unit. According to the measurement command output to the measuring head, the workpiece is measured at every certain time interval,
As a result, the first time for the programmable controller to acquire the position data of the measuring head and the second time for the measuring head to measure the workpiece according to the measurement command are matched. A workpiece measuring method in a machine tool. A method of measuring a workpiece with a measuring head that is detachably mounted on a spindle of a machine tool,
The workpiece measuring device used in this method is
An NC device for controlling the machine tool;
The measuring head that is detachably mounted on the spindle of the machine tool and measures the workpiece;
A transmission / reception unit that performs transmission / reception with the measurement head;
A control device for controlling the workpiece measuring device;
Including the of the measuring head against the measured point on the workpiece, and a second axial measuring head scans the first axial Toko this measuring head is to measure the distance to the workpiece A programmable controller for acquiring at least two axial position data from the NC device at regular time intervals;
A pulse output unit that is provided in the transmission / reception unit and outputs a timing pulse having a pulse interval corresponding to the fixed time interval;
The workpiece measuring method by the workpiece measuring device is:
The transmission / reception unit outputs the timing pulse from the pulse output unit to the programmable controller, and at the same time outputs a measurement command to the measurement head at every certain time interval,
When the programmable controller receives the timing pulse, the programmable controller obtains the position data of the measuring head at every certain time interval,
When the measurement head receives the measurement command, the measurement head measures the workpiece at the predetermined time intervals at a timing that is positively advanced by a time difference set in advance by a prediction system provided in the measurement head,
As a result, a first time when the programmable controller acquires the position data of the measuring head is matched with a second time when the measuring head measures the workpiece, and the position data by the programmable controller And the operation of measuring the workpiece by the measuring head at that time are always repeated at the same timing at regular intervals.
Outputting the position data of the measuring head acquired by the programmable controller to a control device of the workpiece measuring device;
The transmission / reception unit transmits the measurement command to the measurement head, and then outputs the measurement data received from the measurement head to the controller.
This control device obtains two-dimensional shape data or three-dimensional shape data of the workpiece by performing an operation based on the position data and the measurement data, and a workpiece measurement method in a machine tool. A method of measuring a workpiece with a measuring head that is detachably mounted on a spindle of a machine tool,
The workpiece measuring device used in this method is
An NC device for controlling the machine tool;
The measuring head that is detachably mounted on the spindle of the machine tool and measures the workpiece;
A transmission / reception unit that performs transmission / reception with the measurement head;
A control device for controlling the workpiece measuring device;
Including the of the measuring head against the measured point on the workpiece, and a second axial measuring head scans the first axial Toko this measuring head is to measure the distance to the workpiece A programmable controller for acquiring at least two axial position data from the NC device at regular time intervals;
A pulse output unit that is provided in the transmission / reception unit and outputs a timing pulse having a pulse interval corresponding to the fixed time interval;
The workpiece measuring method by the workpiece measuring device is:
The transmission / reception unit outputs the timing pulse from the pulse output unit to the programmable controller, and at the same time generates a measurement command for each certain time interval,
When the programmable controller receives the timing pulse, the programmable controller obtains the position data of the measuring head at every certain time interval,
The measurement head is positively advanced from the timing of the certain time interval by the time difference set in advance by a prediction system provided in the transmission / reception unit and is synchronized with the timing of the timing pulse from the transmission / reception unit. According to the measurement command output to the measuring head, the workpiece is measured at every certain time interval,
As a result, the programmable controller matches the first time when the programmable controller acquires the position data of the measuring head and the second time when the measuring head measures the workpiece according to the measurement command. The operation of acquiring the position data according to the above and the operation of measuring the workpiece by the measuring head at that time are always repeated at the same time interval at the predetermined time interval,
Outputting the position data of the measuring head acquired by the programmable controller to a control device of the workpiece measuring device;
The transmission / reception unit transmits the measurement command to the measurement head, and then outputs the measurement data received from the measurement head to the controller.
This control device obtains two-dimensional shape data or three-dimensional shape data of the workpiece by performing an operation based on the position data and the measurement data, and a workpiece measurement method in a machine tool.

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