JP2008070143A - Optical measuring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform high-precision measurement, when measuring the shape, or the like, of an object being measured by installing a measuring means on a tool mounting section of a processing machine. <P>SOLUTION: An arithmetic control section 37 moves a processing table 2 and a spindle head 6 of the processing machine 1 at a predetermined distance and decides that the table 2 and the spindle head 6 have stopped moving, when the value obtained by integrating twice acceleration signals from acceleration detectors 41, 46 lies within a predetermined standard value; an optical measuring apparatus 18, installed on the tool mounting section 10, detects the measuring light reflected by the object under measurement 4; the arithmetic control section 37 scans the object under measurement 4 by moving the table 2 and the spindle head 6 by a predetermined amount to measure it, while maintaining synchronization, by receiving driving instruction values for the table 2 and the spindle head 6, from an NC control system 9 and calculates the shape, or the like, of the object under measurement 4, on the basis of the measuring light detected. The positions of the processing table 2 and the spindle head 6 and measured data are thereby set in synchronism with each other, and calculation of the shape or the like of the object under measurement 4 is carried out with high accuracy. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical measurement system that optically measures a length-related characteristic of a measurement object.

  2. Description of the Related Art Conventionally, various automatic control processing machines such as an NC processing machine and a machining center that perform processing of a processing target by automatic control have been used. The automatic control processing machine has a processing table for mounting and fixing a processing target, and a tool spindle position (tool mounting portion) that is a shaft to which a processing tool is mounted and is mounted on the tool mounting portion. A spindle head for driving the tool, and an automatic tool changer (ATC) for automatically attaching / detaching the selected machining tool to / from the tool attachment portion are provided.

  The ATC selects a tool magazine for storing a plurality of machining tools and a tool necessary for machining from the plurality of machining tools stored in the tool magazine, and attaches the tool to the tool mounting portion of the spindle head. And an arm for removing the processing tool, which has been used, from the tool mounting portion and storing it in the tool magazine.

  When processing the processing target by the automatic control type processing machine, by moving the processing table with the processing target fixed in the horizontal direction (X-axis direction and Y-axis direction) by a predetermined amount by automatic control by the control means. The workpiece is moved by a predetermined amount in the X-axis direction and the Y-axis direction, and the spindle head is moved by a predetermined amount in the vertical direction (Z-axis direction) in synchronization with the movement of the processing table in the horizontal direction. Thus, the machining tool is moved by a predetermined amount in the vertical direction, and the machining object is machined by the machining tool.

  When changing the processing tool used for processing, the ATC removes the processing tool attached to the tool mounting portion of the spindle bed, stores the processing tool removed from the tool mounting portion in the tool magazine, Selection of a machining tool to be used for machining from among a plurality of machining tools stored in the tool magazine, removal of the selected machining tool from the tool magazine, and removal of the taken machining tool to the tool mounting portion Install. As a result, the processing tool is exchanged for the processing machine.

The processing tool is attached to a holder portion whose size, shape, etc. are determined by a predetermined standard so that it can be attached and detached by ATC, and the holder portion is attached to the tool attachment portion. Thus, the machining tool is configured to be attached to the tool attachment portion (see Patent Document 1).
By the way, in order to process the processing target more accurately, it is measured whether or not the shape of the processing target is processed to a predetermined value during the processing of the processing target or at the time when the temporary processing is completed. ing.

  Conventionally, in measuring a processing target (when measuring, it is a measuring target), the processing target is fixed to a processing table on a processing table, and a contact-type touch sensor is provided on the tool mounting portion. The touch sensor is brought into contact with the surface to be processed, the position coordinate value (X coordinate value, Y coordinate value) of the processing table at that time and the position of the spindle head (Z coordinate value) are read, and the measurement point The shape of the measurement object is measured by obtaining three-dimensional coordinates.

  However, in the measurement using the contact type touch sensor, the current position is read by the touch switch trigger by the contact type touch sensor in a state where the table and the tool mounting part are completely stopped. It was impossible to measure at a high speed while moving to.

  In the contact type, since the surface to be measured is intermittently scanned, the number of measurement points is small, and detailed measurement of the measurement object having an uneven shape is difficult. That is, the shape measurement on the scanning line is a rough and intermittent point cloud measurement, and it is difficult to perform more continuous and fine three-dimensional shape measurement, and it is difficult to measure with high accuracy.

Further, there is a great risk of damage to the processing surface to be measured due to contact.
In addition, if the processing table obtained from the processing machine and the position information of the tool mounting part and the measurement data are not synchronized, the position between the measurement position on the measurement target and the measurement position where the measurement data was obtained Due to the deviation, there is a problem that high-precision measurement cannot be performed.

Japanese Patent Laid-Open No. 10-80834

An object of the present invention is to make it possible to perform highly accurate measurement when a measuring means is attached to a tool mounting portion of a processing machine to measure a characteristic relating to a length of a measurement object.
Another object of the present invention is to enable high-accuracy and high-speed measurement when measuring the length-related characteristics of a measurement object by attaching a measuring means to a tool mounting portion of a processing machine.

According to the present invention, a holder part having a shape that can be attached to and detached from a tool attachment part of a processing machine, a light source that is provided integrally with the holder part and that outputs measurement light, and for processing the processing machine A light detection means for detecting the measurement light reflected by the measurement object attached to the table, and a calculation means for calculating a characteristic relating to the length of the measurement object based on the measurement light detected by the light detection means Optical measurement means, position information output means for outputting position information relating to the positions of the processing table and the tool mounting portion, and stop determination for determining stop of relative movement of the processing table and the tool mounting portion. The measuring means detects the measurement light detected by the light detection means when the stop determination means determines that the relative movement of the processing table and the tool mounting portion has stopped. Serial in synchronization with said position information received at the time of stop determination, optical measuring systems, characterized in that to calculate the characteristics relating to length for the measurement target is provided.
The calculation means synchronizes the measurement light detected by the light detection means and the position information received at the stop determination when the stop determination means determines that the relative movement between the processing table and the tool mounting portion has stopped, The characteristic about the length about a measuring object is calculated.

Here, it is provided with stop detection means for detecting a stop of relative movement between the machining table and the tool mounting portion and outputting a stop signal, and the stop determination means is configured to receive the stop signal when receiving the stop signal. You may comprise so that it may judge that the relative movement of a tool attachment part stopped.
In addition, a displacement detection unit that detects a displacement of relative movement between the machining table and the tool mounting portion is provided, and the stop determination unit has a displacement per predetermined time detected by the displacement detection unit within a predetermined reference value. In some cases, it may be determined that the relative movement between the processing table and the tool mounting portion is stopped.

In addition, a speed detection unit that detects a relative speed between the processing table and the tool mounting portion and outputs corresponding speed information, the stop determination unit has a value obtained by integrating the speed information from the speed detection unit. A configuration may be adopted in which it is determined that the relative movement of the machining table and the tool mounting portion is stopped when the value is within a predetermined reference value.
In addition, an acceleration detection unit that detects relative acceleration between the machining table and the tool mounting portion and outputs corresponding acceleration information is provided, and the stop determination unit integrates acceleration information from the acceleration detection unit twice. When the value is within a predetermined reference value, the relative movement between the processing table and the tool mounting portion may be determined to be stopped.

Further, according to the present invention, a holder portion having a shape that can be attached to and detached from a tool attachment portion of a processing machine, a light source that is provided integrally with the holder portion and that outputs measurement light, and the processing machine A light detection means for detecting the measurement light reflected by the measurement object attached to the processing table, and a characteristic relating to the length of the measurement object is calculated based on the measurement light detected by the light detection means. An optical measurement means having a calculation means; and a position information output means for outputting position information representing the positions of the tool mounting portion and the processing table, wherein the calculation means is for measurement detected by the light detection means. There is provided an optical measurement system characterized in that light and position information from the position information output means are synchronized to calculate a characteristic relating to the length of the measurement object.
The calculation means synchronizes the measurement light detected by the light detection means and the position information from the position information output means, and calculates a characteristic relating to the length of the measurement object.

Here, the position information output means may be an encoder built in the processing machine, and the position information may be position information from the built-in encoder.
Further, the position information output means may be an encoder externally attached to the processing machine, and the position information may be position information from the external encoder.
Further, the position information is a command value for controlling movement of the positions of the machining table and the tool mounting portion, and the calculating means replaces the command value with respect to the machining table and the tool mounting portion. The product of the predetermined transfer function and the command value may be used as new position information.

  Further, the position information is a command value for controlling movement of the positions of the machining table and the tool mounting portion, and the calculation means performs a predetermined correction on the command value instead of the command value. The value may be used as new position information.

According to the optical measurement system of the present invention, it is possible to perform highly accurate measurement when measuring the length-related characteristics of the measurement target by attaching the measurement means to the tool mounting portion of the processing machine. .
In particular, by measuring while stopping the relative movement of the table and the tool mounting portion, it is possible to perform more accurate measurement.
Further, by measuring without stopping the relative movement of the table and the tool mounting portion, high-speed and high-precision measurement can be performed.

Hereinafter, an optical measurement system according to an embodiment of the present invention will be described with reference to the drawings.
1 and 2 are a front view and a side view, respectively, showing an outline of an optical measurement system according to an embodiment of the present invention, and an NC (numerical value) control type processing machine which is a kind of automatic control type processing machine. The example which uses an optical measuring device with (NC processing machine) is given.

1 and 2, an NC processing machine 1 represented by a machining center is installed on a bed frame 14 as an installation unit. The bed frame 14 is a fixed system that does not move, and is also a predetermined reference position.
A measuring object (work: a processing object at the time of machining and a measurement object at the time of measurement) 4 is mounted on the upper surface of the processing table 2 of the NC processing machine 1 which is used for both processing and measurement. Fixed by. A spindle head 6 for mounting a processing tool (for example, a cutting tool) 5 for processing the measuring object 4 is disposed at a position separated from the processing table 2.

  The spindle head 6 has a tool mounting portion 10 for mounting the machining tool 5 at a predetermined position (tool spindle position) passing through the tool spindle 20 that is an axis to which the machining tool 5 is attached, and the tool spindle 20 direction (Z Axial movement) and the X-axis direction, which is one direction in the horizontal plane, thereby moving the machining tool 5 mounted on the tool mounting portion 10 linearly in the tool spindle 20 direction and the X-axis direction. Let

  Although not shown in detail, the spindle head 6 has a mechanism for feeding the machining tool 5 linearly in the Z-axis direction (vertical direction) and the X-axis direction (one horizontal direction), and the tool spindle 20 as the center. As a mechanism for rotating the machining tool 5 in a horizontal plane (a plane passing through the X axis and the Y axis). The tool spindle 20 serves as a rotation axis around which the machining tool 5 rotates. The optical axis of the measurement light is configured to pass along the tool spindle 20.

  The machining tool 5 can be manually attached to and detached from the spindle head 6. Further, the automatic tool changer (ATC) 7 uses the arm 17 under the control of the NC controller 9 to move the machining tool 5 from the tool magazine 8 which is a tool storage unit for storing the processing tool 5. A mechanism for taking out, mounting the machining tool 5 on the spindle head 6, detaching the machining tool 5 from the spindle head 6, and storing the machining tool 5 in the tool magazine 8 is provided. The machining tool 5 accommodated in the spindle 8 is automatically attached to and detached from the spindle head 6.

A series of controls related to machining such as cutting, etc., including movement control of the machining table 2 in the Y-axis direction, movement control of the spindle head 6 in the X-axis direction and Z-axis direction, tool 5 exchange control, etc. This is performed by the control device 9 executing a machining program stored therein.
Further, the NC control device 9 controls the movement of the machining table 2 in the Y direction and the spindle head 6 when measuring the shape of the measurement target 4 and the distance from the predetermined position to the measurement target position. Controls such as movement control in the X-axis direction and Z-axis direction are also performed by executing a program stored therein. The NC control device 9 constitutes a control means. Reference numeral 19 denotes a controller with a display for controlling the NC control device 9.

The optical measuring instrument 18 configured to be storable in the tool magazine 8 can be automatically attached to and detached from the spindle head 6 by the ATC 7 when the NC control device 9 executes a program in the same manner as the processing tool 5. It is configured.
FIG. 3 is a diagram showing the main components of the optical measurement system according to the present embodiment, and the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals.
The optical measuring device 18 includes a holder portion 11 that is a portion for mounting the optical measuring device 18 on the tool mounting portion 10 of the spindle head 6 and a housing portion 45 that is configured integrally with the holder portion 11.

The holder portion 11 has a shape and a size conforming to the standard of the machining tool 5, and has a groove portion 43 provided in a circumferential shape, and the groove portion 43 can be engaged with the arm 17 of the ATC 7. It constitutes a joint.
The holder portion 11 has a tapered shape that engages with the tool attachment portion 10 that is provided in the spindle head 6 and is configured by a bottomed hole having a predetermined shape. The holder part 11 is attached to the spindle head 6.

  Since the configuration of the holder portion 11 of the optical measuring device 18 is configured to meet the specifications of the machining tool 5, the spindle is handled in the same manner as the machining tool 5 and is in the same mounting position as the machining tool 5. It can be easily attached to the tool attachment portion 10 of the head 6 automatically or manually. As described above, the holder unit 11 can adopt a known configuration used in accordance with the standard of the machining tool 5.

The arm 17 of the ATC 7 has a pair of U-shaped portions as engaging portions at both ends thereof. By engaging the groove portion 43 with the U-shaped portion of the arm 17, the optical measuring device 18 is operated by the ATC 7. The arm 17 is moved while holding. Thereby, the optical measuring device 18 is configured to be able to be stored, taken out and conveyed with respect to the tool magazine 8 storing the processing tool 5 and is attached to and detached from the tool mounting portion 10 of the spindle head 6. It is configured as follows.
As described above, when the optical measuring device 18 is automatically attached to and detached from the spindle head 6, it can be performed in the same manner as the attachment and detachment of the tool 5 by the ATC 7.

  A light source 38 that outputs measurement light, which is light used for measurement, and a light detection element 39 that detects measurement light are disposed in the housing portion 45 that is configured integrally with the holder portion 11. As the light source 38, a light emitting element that outputs light of a predetermined wavelength, such as an infrared light emitting diode or a semiconductor laser, can be used. The light detection element 39 can be constituted by, for example, a PSD (Position Sensitive Detector), and a CCD (Charge Coupled Device) sensor or the like can also be used. The light detection element 39 constitutes a light detection means.

In addition, an electric cable 40 for supplying power to the light source 38 and the light detection element 39, controlling the light source 38 and the light detection element 39, taking out a signal detected by the light detection element, and the like is connected to the housing portion 45. And is connected to the arithmetic control unit 37 via the cable 40.
The optical measurement device 18 measures characteristics related to the length of the measurement target 4 such as the shape of the measurement target 4 and the distance from the predetermined position to the measurement target position of the measurement target 4 by a triangulation method.

  In the present embodiment, the light source 38 and the light detection element 39 are mounted on the optical measuring device 18, and the calculation process of the shape of the measurement object 4 based on the control and the signal from the light detection element 39 is performed using the electric cable 40. However, a part of the calculation control device 37 may be arranged in the optical measurement device 18, that is, optical measurement. The apparatus 18 may be configured to include at least the light source 38 and the light detection element 39.

The arithmetic control device 37 includes a display device 56, a data processing unit 57, a measurement controller 58, and a controller 59. The data processing unit 57 performs control processing such as measurement mode switching, scan direction switching, scan pitch switching, and NC program creation.
The measurement controller 58 performs control such as monitoring mode switching, noise removal low-pass filter (LPF) characteristic setting, determination reference value setting, and the like.

The controller 59 controls the display device 56, the data processor 57, and the measurement controller 58, and also controls the NC control device 9 via the interface 36, whereby movement control and measurement of the table 2 and the spindle head 6 are performed. Measurement control of the apparatus 18 is performed.
Here, the arithmetic control unit 37 constitutes a calculation means and a stop determination means, and constitutes an optical measurement means together with the optical measurement device 18.

The NC control device 9 includes a CNC control unit 31 that handles various commands, control commands, arithmetic processing, comparison, and the like, a plurality of control units 51 to 55 that perform control according to various functions, a dedicated interface 36, and a controller 19. .
The CNC control unit 31 of the NC control device 9 detects position information output means for outputting position information related to the positions of the machining table 2 and the tool mounting unit 10, and stops the relative movement of the machining table 2 and the tool mounting unit 10. Thus, stop detection means for outputting a stop signal is configured.

  The control unit 55 is a control unit for performing movement control of the processing table 2 and the spindle head 6 of the processing machine 1. The control unit 55 is connected to drive mechanisms 33, 34, and 35 including servo amplifiers, servo motors, and encoders (built-in encoders) for three axes (XYZ axes) orthogonal to each other.

  A laser type three-dimensional measuring device 18 is coaxially mounted in place of the processing tool 5 on the tool mounting portion 10 which is the tip of the spindle head 6. A measurement command is sent from the arithmetic control unit 37 to the CNC control unit 31 of the NC control device 9 via the dedicated interface 36. The measurement light 15 emitted from the light source 38 of the three-dimensional measuring device 18 is applied to the surface of the measurement object 4. The measurement light 15 reflected by the measurement object 4 is detected by the light detection element 39. Based on the measurement light detected by the light detection element 39, the data processing function of the arithmetic control unit 37 obtains characteristics relating to the length of the scanned surface of the measurement object 4 such as the three-dimensional shape.

The positions of the spindle head 6 (in other words, the tool mounting portion 10) and the measurement object 4 (in other words, the table 2) can be read continuously in real time by the built-in encoders of the drive mechanisms 33, 34, and 35. It has become.
The arithmetic control unit 37 has a function of switching between a high-speed continuous measurement mode and a high-accuracy measurement mode, noise processing included in acceleration data, and a stop determination function.

Here, the high-accuracy measurement mode is a state in which the spindle head 6 and the table 2 are moved after a predetermined amount and then stopped, and measurement is performed by the measuring device 18 in this stopped state, and then the spindle head 6 and the table 2 are moved again by a predetermined amount. This is a mode for measuring the characteristics relating to the length of the measuring object 4 while repeating the operation of stopping the measurement and performing the measurement by the measuring device 18.
As described above, in the high-accuracy measurement mode, the measurement is performed while the spindle head 6 and the table 2 are relatively stopped. Therefore, the measurement object 4 can be measured while accurately synchronizing the machining center and the measurement point. Thus, highly accurate measurement is possible.

  In the high-accuracy measurement mode, the position information of the NC processing machine 1 (specifically, the position information of the table 2 and the tool mounting portion 10 of the spindle head 6) and the measurement points on the measurement object 4 measured by the optical measuring device 18 As a method of synchronizing the measurement data, a method of performing measurement using a stop signal output from the NC control device 9 of the NC processing machine 1, and the movement of the table 2 and the tool mounting portion 10 of the spindle head 6 are stopped ( The stop includes not only a complete stop state but also a movement amount within a predetermined time within a predetermined reference value.) When it is detected that the measurement object 4 is measured by the optical measuring device 18. There is a way to do it.

  In the measurement state of the measurement object 4, the CNC control unit 31 instructs the control unit 55 of the movement destination positions of the tool mounting unit 10 of the spindle head 6 and the spindle unit 6 as in the processing of the measurement object 4. The command value signal is supplied. The control unit 55 controls the drive mechanisms 33 to 35 so as to move the table 2 and the tool mounting part 10 of the spindle head 6 to a position corresponding to the command value signal from the CNC control part 31.

  At the same time, the controller 59 of the arithmetic control unit 37 controls the light source 38 and the light detection element 39 via the cable 40 to output the measurement light from the light source 38 and detect the measurement light reflected by the measurement object 4. Detected by element 39. The controller 59 of the arithmetic control unit 37 associates the measurement light data detected by the light detection element 39 and the position information of the table 2 and the tool mounting part 10 of the spindle head 6 with each other and stores them in the internal storage unit. The measurement data of the measurement light stored at this time and the position information are synchronized. The controller 59 of the arithmetic control unit 37 calculates the characteristics of the measurement object 4 such as the shape and the like based on a plurality of measurement data obtained by measurement at a plurality of points of the measurement object 4 and synchronized with the position information. .

  When performing measurement using the stop signal output from the NC machine 1, the control unit 51 sends a command value signal from the CNC control unit 31 (the position of the NC machine (specifically, the table 2 and the spindle head 6). Is output to the arithmetic control unit 37 via the dedicated I / F 36, and a stop signal indicating that the movement of the table 2 and the spindle head 6 has been stopped is arithmetically controlled via the dedicated I / F 36. To the unit 37.

  The controller 59 of the arithmetic control unit 37 has a length such as the shape of the measurement object 4 based on the positions of the table 2 and the spindle head 6 when the stop signal is received and the measurement light received from the measurement device 18. Calculate the characteristics for. In the case of an NC machine that outputs zero speed as a stop signal among the speed data, a synchronized state is established in the stop state even for a very short time. Therefore, highly accurate measurement in which the position of the NC processing machine and the measurement data are synchronized becomes possible.

The detectors 41 and 46 are detectors for detecting that the movement of the tool mounting portion 10 of the table 2 and the spindle head 6 has stopped.
When an acceleration detector (acceleration detection means), a speed detector (speed detection means), or a displacement detector (displacement detection means) is used as the detectors 41 and 46, only the differential hierarchy is different. Any detector may be used because they are the same. When an acceleration detector is used as a detector, a displacement amount is calculated by integrating the output signal twice, and it is determined whether or not the vehicle is stopped based on the displacement amount. When a speed detector is used The output signal is integrated once to calculate the displacement amount, and based on the displacement amount, it is determined whether or not the vehicle is stopped. When a displacement detector is used, the displacement amount that is the output signal is calculated. Based on this, it is determined whether or not the vehicle is stopped.

When the acceleration detector is used, it is determined that the displacement is obtained when the displacement obtained by integrating twice falls within a predetermined reference value. The reference value is appropriately determined in consideration of the measurement accuracy of the laser measuring device 18 and the state of the measurement light. The speed behavior obtained by one-time integration can also be used as auxiliary data for determination. Although various noises are synergistic with the acceleration data, it is preferable to remove them from the vibration characteristics separately grasped by appropriate filtering.
When measurement is performed with measurement light during the extremely short stop time of the processing machine 1 (that is, when the table 2 or the spindle head 6 is stopped), if the stop state is guaranteed, the synchronization is poor. Therefore, it is possible to perform extremely high-precision measurement without being affected by the decrease in measurement accuracy caused by.

  The stop state may be a method of receiving a stop signal obtained by processing the encoder value. As another method, relative to the acceleration of the uniaxial (Y axis) acceleration detector 46 installed on the spindle head 6 side and the acceleration of the biaxial (X axis, Z axis) acceleration detector 41 installed on the table 2 side. The acceleration is obtained, the relative speed and the relative displacement are calculated, and compared with a predetermined reference value determined separately, the processing machine 1 is stopped, that is, the measurement timing is obtained. The amplifiers 20 and 22 that amplify the output signals of the acceleration detectors 41 and 46 may be built in the acceleration detectors 41 and 46, or may be externally attached later.

  In the case of the method using the stop signal, the control unit 55 makes the table 2 and the spindle head 6 (in other words, the tool mounting portion 10) relatively based on the signals from the built-in encoders included in the drive mechanisms 33 to 35. The stop is detected, and a stop signal indicating the stop is output to the CNC control unit 31. The CNC control unit 31 transmits the stop signal to the calculation control unit 37 via the control unit 51 and the dedicated I / F, and the calculation control unit 37 makes the table 2 and the tool mounting unit 10 relative to each other based on the stop signal. It is judged that it stopped.

Further, when the arithmetic control unit 37 determines that the relative movement between the machining table 2 and the tool mounting unit 10 is stopped as described above, the calculation control unit 37 receives the measurement light detected by the light detecting element 39 and the stop determination. The position-related information (command value information from the CNC control unit 31) is synchronized, and the characteristic regarding the length of the measurement object 4 is calculated.
As another method for determining the stop state, the calculation control unit 37 determines that the machining table 2 and the tool mounting unit are set when the value obtained by integrating the acceleration signals from the acceleration detectors 41 and 46 twice is within a predetermined reference value. You may make it judge that the relative movement of 10 has stopped.

  Also, instead of the acceleration detectors 41 and 46, a speed detector (not shown) that detects the relative speed between the processing table 2 and the tool mounting portion 10 and outputs corresponding speed information is used to control the calculation. The unit 37 determines that the relative movement of the machining table 2 and the tool mounting unit 10 is stopped when the value obtained by integrating the speed information from the speed detector once is within a predetermined reference value. It may be.

  Further, instead of the acceleration detectors 41 and 46, a displacement detector (not shown) for detecting the displacement of the relative movement between the machining table 2 and the tool mounting unit 10 is used, and the arithmetic control unit 37 is configured to transmit the displacement. When the displacement per predetermined time detected by the detector is within a predetermined reference value, it may be determined that the relative movement between the processing table 2 and the tool mounting portion 10 is stopped.

On the other hand, the high-speed continuous measurement mode is a mode in which the spindle head 6 and the table 2 are continuously moved and measurement is performed by the optical measuring device 18. Since the measurement related to the length of the measuring object 4 is performed while moving the spindle head 6 and the table 2 relatively continuously, high-speed measurement is possible. Further, since measurement is performed optically, high-precision measurement is possible.
In other words, the arithmetic control unit 37 synchronizes the position information indicating the positional relationship between the tool mounting unit 10 and the processing table 2 and the measurement light detected by the light detection element 39, and the three-dimensional shape of the measurement target 4 or the like. The characteristic regarding the length of is calculated.

In this case, the arithmetic control unit 37 uses an encoder built in the drive mechanisms 33 to 35 of the processing machine 1 as position information output means, and uses the position information from the position information output means to synchronize with measurement data. The calculation processing of characteristics such as a three-dimensional shape may be performed.
As another method, the arithmetic control unit 37 uses an encoder (not shown) externally attached to the processing machine 1 as position information output means, and uses position information from the external encoder. The characteristic calculation processing may be performed in synchronization with the measurement data.

  Further, the arithmetic control unit 37 replaces the command value supplied from the CNC control unit 31 to the control unit 55 in order to control the movement of the processing table 2 and the tool mounting unit 10, and the processing table 2 and the tool mounting unit. A product of a predetermined transfer function for the unit 10 and the command value may be used as new position information. Thus, by correcting the command value with a predetermined transfer function, it becomes possible to synchronize the position information and the measurement data with high accuracy.

  Further, the arithmetic control unit 37 replaces the command value supplied from the CNC control unit 31 to the control unit 55 in order to control the movement of the machining table 2 and the tool mounting unit 10, and performs a predetermined correction on the command value. You may make it use the value which gave these as new positional information. This also makes it possible to synchronize position information and measurement data with high accuracy.

In addition, a reference index serving as a reference for position coordinates is arranged in the vicinity of the measurement object 4 and the measurement is performed at the same time when measuring the measurement object 4 and calculating characteristics such as a three-dimensional shape. The reference index may be used for correction so as to suppress errors due to asynchrony.
FIG. 4 is a flowchart showing processing in the optical measurement system according to the embodiment of the present invention, and is a flowchart showing processing in the high-precision measurement mode.

Hereinafter, the operation in the high-precision measurement mode in the present embodiment will be described with reference to FIGS.
First, when the user inputs various data necessary for measurement such as setting of a measurement procedure, data for specifying a measurement range, selection of filter characteristics, and the like from the calculation control unit 37, the setting contents and setting data are calculated. The data is stored in the storage unit in the controller 59 of the control unit 37 (step S401).
The calculation control unit 37 is a command that is a command for driving the drive mechanisms 33 to 35 to move the table 2 and the spindle head 6 in a predetermined scanning direction by a predetermined amount to the control unit 55 of the NC control device 9. A command is issued (step S402). In response to the drive command from the NC control device 9, the control unit 55 drives the drive mechanisms 33 to 35 to drive the table 2 and the spindle head 6 in a predetermined direction for a predetermined distance.

Next, the arithmetic control unit 37 issues a braking command, which is a command for stopping the movement in the scanning direction, to the drive mechanisms 33 to 35 via the control unit 55 (step S403).
Next, the arithmetic control unit 37 detects acceleration signals from the acceleration detectors 41 and 46 (step S404), removes noise included in the acceleration signals (step S405), integrates the acceleration data once, and speeds up. And the acceleration data is integrated twice to calculate the displacement amount (step S406).

If the direct current (DC) component of the speed calculated in the processing step S406 is outside the predetermined reference value, the calculation control wet 37 determines that braking is still insufficient (creep movement) and returns to the processing step S403. When the direct current component of the speed is within a predetermined reference value, it is determined that braking is sufficient, and it is determined whether or not the vehicle is stopped based on the calculated displacement amount (step S408).
If the displacement amount is outside the predetermined reference value, the arithmetic control unit 37 determines that the displacement has not been stopped yet, returns to processing step S404, and executes processing steps S404 to S408 again. If it is within the value, it is determined that the operation is stopped, and the optical measurement apparatus 18 is instructed to perform measurement (step S409).

In response to the measurement command from the calculation control unit 37, the measurement device 18 detects the measurement light reflected by the measurement object 4 by the light detection element 39 and passes the cable 40 as measurement data to the calculation control unit 37. Output to.
The arithmetic control unit 37 captures and stores the measurement data from the measurement device 18 in association with the command value information received from the CNC control device 31 via the dedicated I / F 36 (step S410), and sets the target measurement area. If the measurement is not completed, the process returns to process step S402 to move to the next measurement point and perform the measurement process. When the measurement of the target measurement area is completed, the measurement process is terminated (step S411).
The plurality of measurement data obtained here is synchronized with the position information of the table 2 and the spindle head 4 (in other words, the component mounting portion 10). The arithmetic control unit 37 calculates a characteristic related to the length of the shape or the like of the measurement target 4 using the plurality of data measured in the measurement process.

  As described above, the calculation control unit 37 moves the machining table 2 and the spindle head 6 of the machining machine 1 in a predetermined direction, and a value obtained by integrating the acceleration signals from the acceleration detectors 41 and 46 twice is a predetermined reference value. The optical measuring device 18 mounted on the tool mounting portion 10 detects the measurement light reflected by the measuring object 4 when it is determined that the table 2 and the spindle head 6 have stopped. The arithmetic control unit 37 scans the measuring object 4 by moving the table 2 and the spindle head 6 by a predetermined amount while receiving and synchronizing the command values for driving the table 2 and the spindle head 6 from the NC controller 9. Measurement is performed, and the characteristics relating to the length of the shape or the like of the measurement object 4 are calculated based on the detected plurality of measurement lights. That is, when the arithmetic control unit 37 determines that the relative movement of the table 2 of the processing machine and the tool mounting unit 10 has stopped, the measurement light detected by the light detection element 39 and the position information received at the time of the stop determination Are synchronized so that the characteristic regarding the length of the measuring object 4 is calculated.

Therefore, according to the optical measurement system according to the present embodiment, when the measuring device 18 is attached to the tool mounting portion 10 of the processing machine and the characteristics relating to the length of the measuring object 4 are measured, the processing table 2 In addition, the position of the spindle head 6 and the measurement data are synchronized, and the characteristics relating to the length of the measurement object 4 are performed with high accuracy.
In addition, as described above, in the high-accuracy measurement mode, a determination method based on a stop signal from the CNC control unit 31 can be applied as another method for determining the stop of the machining table 2 and the tool mounting unit 10. .

  In each of the above embodiments, the light source 38 and the light detection element 39 are used to measure the shape of the measurement target and the distance from the predetermined position to the measurement target position by the triangulation method. However, it is also possible to perform measurement using two light detection elements disposed at positions that are not related to the light source and have a predetermined mutual relationship.

  It can be applied to an optical measuring device used with various automatic control processing machines such as NC milling machines, machining centers, NC lathes, NC electric discharge machines. Further, it is suitable for an optical measurement method using the automatic control type processing machine and an optical measurement device.

It is a front view which shows the outline | summary of the optical measuring system which concerns on embodiment of this invention. 1 is a side view showing an outline of an optical measurement system according to an embodiment of the present invention. 1 is a partial detail view of an optical measurement system according to an embodiment of the present invention. It is a flowchart which shows the process of the optical measuring system which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... NC processing machine as automatic control type processing machine 2 ... Measuring table 3 ... Fixing tool 4 ... Measuring object 5 ... Processing tool 6 ... Spindle head 7 ... ATC
8 ... Tool magazine 9 ... NC controller 10 ... Tool mounting part 11 ... Holder part 14 ... Bed frame 15 ... Optical axis 17 ... Arm 18 ... Optical measurement Optical measuring device 20 constituting means ... tool spindle 31 ... position information output means, CNC control units 33 to 35 constituting stop detecting means ... drive mechanism 37 ... calculating means, stop judging means , Arithmetic control unit 38 constituting the optical measuring means ... light source 39 ... light detecting element 40 constituting the light detecting means ... electric cable 43 ... groove 45 as the coupling part ... accommodating Units 41 and 46 Acceleration detectors 51 to 55 constituting acceleration detection means Control unit 56 Display unit 57 Data processing unit 58 Measurement controller

Claims (10)

A holder part having a shape that can be attached to and detached from the tool attachment part of the processing machine, a light source that is provided integrally with the holder part and that outputs measurement light, and a measurement attached to the processing table of the processing machine Optical measurement having light detection means for detecting the measurement light reflected by the object, and calculation means for calculating characteristics relating to the length of the measurement object based on the measurement light detected by the light detection means Means,
Position information output means for outputting position information regarding the positions of the processing table and the tool mounting portion;
Stop determination means for determining stop of relative movement of the processing table and the tool mounting portion,
When the stop determination unit determines that the relative movement between the processing table and the tool mounting portion has stopped, the calculation unit detects the measurement light detected by the light detection unit and the position information received at the time of the stop determination. And a characteristic relating to the length of the measurement object is calculated. A stop detecting means for detecting a stop of relative movement between the processing table and the tool mounting portion and outputting a stop signal;
The optical measurement system according to claim 1, wherein when the stop signal is received, the stop determination unit determines that the relative movement of the processing table and the tool mounting portion has stopped. Displacement detecting means for detecting the displacement of the relative movement between the processing table and the tool mounting portion,
The stop determination means determines that the relative movement of the machining table and the tool mounting portion is stopped when the displacement per predetermined time detected by the displacement detection means is within a predetermined reference value. The optical measurement system according to claim 1. A speed detecting means for detecting a relative speed between the processing table and the tool mounting portion and outputting corresponding speed information;
The stop determination means determines that the relative movement of the machining table and the tool mounting portion is stopped when a value obtained by integrating the speed information from the speed detection means is within a predetermined reference value. The optical measurement system according to claim 1. Acceleration detecting means for detecting relative acceleration between the processing table and the tool mounting portion and outputting corresponding acceleration information,
The stop determination means determines that the relative movement of the machining table and the tool mounting portion is stopped when a value obtained by integrating twice the acceleration information from the acceleration detection means is within a predetermined reference value. The optical measurement system according to claim 1. A holder part having a shape that can be attached to and detached from the tool attachment part of the processing machine, a light source that is provided integrally with the holder part and that outputs measurement light, and a measurement attached to the processing table of the processing machine Optical measurement having light detection means for detecting the measurement light reflected by the object, and calculation means for calculating characteristics relating to the length of the measurement object based on the measurement light detected by the light detection means Means,
Position information output means for outputting position information representing the position of the tool mounting portion and the processing table,
The calculating means synchronizes the measurement light detected by the light detecting means and the position information from the position information output means, and calculates a characteristic relating to the length of the measurement object. Measuring system.   The optical measurement system according to claim 6, wherein the position information output unit is an encoder built in the processing machine, and the position information is position information from the built-in encoder.   The optical measurement system according to claim 6, wherein the position information output means is an encoder externally attached to the processing machine, and the position information is position information from the external encoder. The position information is a command value for controlling movement of the position of the processing table and the tool mounting portion,
The said calculating means uses the product of the predetermined transfer function about the said process table and the said tool attachment part, and the said command value as new position information instead of the said command value. Optical measurement system. The position information is a command value for controlling movement of the position of the processing table and the tool mounting portion,
The optical measurement system according to claim 6, wherein the calculation unit uses a value obtained by performing a predetermined correction on the command value as new position information instead of the command value.

Images