CN109420933B - Workpiece detection device and workpiece detection method - Google Patents
Workpiece detection device and workpiece detection method Download PDFInfo
- Publication number
- CN109420933B CN109420933B CN201810974336.6A CN201810974336A CN109420933B CN 109420933 B CN109420933 B CN 109420933B CN 201810974336 A CN201810974336 A CN 201810974336A CN 109420933 B CN109420933 B CN 109420933B
- Authority
- CN
- China
- Prior art keywords
- interference
- workpiece
- probe
- unit
- contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
Abstract
The invention provides a workpiece detection device and a workpiece detection method capable of detecting the position of a workpiece. The workpiece detection device is provided with: a probe that detects whether or not contact with a workpiece is made within a predetermined range and that emits a contact signal indicating a detection result; and an interference detection unit that detects whether or not there is interference, wherein the interference determination unit determines whether or not there is interference within a predetermined time before when the acquired contact signal indicates that there is contact with the workpiece. The coordinate determination unit determines the coordinates of the workpiece based on the determination result of the interference determination unit.
Description
Technical Field
The present invention relates to a workpiece detection apparatus and a workpiece detection method for detecting a position of a workpiece.
Background
Conventionally, it is known to use a moving probe in a technique for detecting the position of a processing object (workpiece) in a processing apparatus.
Japanese laid-open patent publication No. 2016-142638 has a contact and a detecting mechanism. When the contact is in contact with the detection point, the detection mechanism detects the electrical conduction. After the contact is moved in a first direction toward the detection point and conduction is detected, the contact is moved in a second direction opposite to the first direction. When the contact maintains conduction even if the contact moves in the second direction by a predetermined threshold or more, it is determined that there is a possibility that the conductive liquid adheres to the detection point. When the detection mechanism detects contact of the probe with the workpiece while the disturbance is occurring, the detection result may be affected by the disturbance. The detection results incur position detection inaccuracy of the workpiece. The detection method disclosed in the above publication 2016-142638 cannot solve the above-mentioned problems.
Disclosure of Invention
The invention provides a workpiece detection device and a workpiece detection method, which can accurately detect the position of a workpiece by considering the influence caused by interference.
The workpiece detection device according to claim 1 includes: a probe that detects whether or not contact with a workpiece is made within a predetermined range and that emits a contact signal indicating a detection result; and a coordinate determination unit that determines coordinates of the workpiece based on the contact signal emitted by the probe, the workpiece detection apparatus further including: an interference detection unit that detects whether or not interference is present; and an interference determination unit that determines whether or not the interference detection unit detects the presence of interference within a predetermined time period before the contact signal is emitted when the probe emits the contact signal indicating that contact with the workpiece is present, wherein the coordinate determination unit determines the coordinates of the workpiece based on a determination result of the interference determination unit.
When the acquired contact signal indicates that contact with the workpiece is present, the interference determination unit determines whether or not interference is present within a predetermined time before. The coordinate determination unit determines the coordinates of the workpiece based on the determination result of the interference determination unit. Therefore, the workpiece detection apparatus can eliminate the influence of the disturbance when determining the coordinates of the workpiece.
The workpiece detection device according to claim 2 includes a drive motor that drives the probe, and the disturbance includes a load of the drive motor.
The interference detection unit detects interference including a load of a drive motor of the probe. The disturbance determination unit determines whether or not a disturbance including a load of the drive motor is present within a predetermined time period before. Therefore, the workpiece detection device can eliminate the influence of disturbance caused by the torque of the drive motor of the device when determining the coordinates of the workpiece.
The workpiece detection device according to claim 3 or 4 includes an invalidation unit that invalidates the acquired contact signal when the interference determination unit determines that the interference detection unit detects the presence of the interference within a predetermined time period before the contact signal is emitted.
The nullifying unit nullifies the acquired contact signal when the interference determining unit determines that the interference is present. Therefore, the workpiece detection device can eliminate the influence of the disturbance and accurately determine the coordinates of the workpiece.
The workpiece detection device according to claim 5 includes a speed changing unit that changes a moving speed of the probe when the interference determination unit determines that the interference detection unit detects the presence of the interference within a predetermined time period before the contact signal is emitted, and the probe performs the probing within the predetermined range again when the speed changing unit changes the moving speed of the probe.
When the interference determination unit determines that interference is present, the probe is again executed while changing the moving speed of the probe. When the moving speed of the probe is changed, the timing of the occurrence of the interference is changed, so that the workpiece detecting apparatus can eliminate the influence of the interference.
In the workpiece detecting apparatus according to claim 6, the interference determining unit determines whether or not the interference is present for a time longer than the predetermined time when the moving speed of the probe is changed.
When the moving speed of the probe is changed, the detection sensitivity of the probe may be affected. Therefore, the workpiece detection device can accurately detect the position of the workpiece by changing the time range related to the determination by the interference determination unit in accordance with the change in the moving speed of the probe.
The workpiece detection method according to claim 7 is a workpiece detection method for detecting a position of a workpiece by a workpiece detection apparatus, the workpiece detection apparatus including: a probe that detects whether or not the workpiece is in contact with the probe within a predetermined range, and that emits a contact signal indicating a detection result; and a coordinate determination unit that determines coordinates of the workpiece based on a contact signal emitted by the probe, wherein the workpiece detection device further includes a disturbance detection unit that detects whether or not a disturbance is present, and the workpiece detection method includes: an interference determination step of determining whether or not the interference detection unit detects the presence of interference within a predetermined time period before the probe issues a contact signal indicating the presence of contact with the workpiece; and determining the coordinates of the workpiece based on the determination result in the interference determination step.
When the acquired contact signal indicates that contact with the workpiece is present, it is determined whether or not interference is present within a predetermined time before, and the coordinates of the workpiece are determined based on the result of the determination. Therefore, the influence of the disturbance can be eliminated when determining the coordinates of the workpiece.
Drawings
Fig. 1 is a configuration diagram showing a main part configuration of a workpiece detection device according to embodiment 1.
Fig. 2 is a functional block diagram showing a configuration of a main part of the data processing unit according to embodiment 1.
Fig. 3 is an explanatory diagram schematically illustrating the workpiece position detection processing in embodiment 1.
Fig. 4 is an explanatory diagram schematically illustrating the workpiece position detection processing in embodiment 1.
Fig. 5 is a flowchart for explaining the process of detecting the workpiece position according to embodiment 1.
Fig. 6 is a functional block diagram showing a configuration of a main part of a data processing unit according to embodiment 2.
Fig. 7 is a configuration diagram showing a main part configuration of a workpiece detection apparatus according to embodiment 4.
Detailed Description
Hereinafter, a workpiece detection apparatus and a workpiece detection method according to embodiments of the present invention will be described with reference to the drawings. The workpiece detection device of the embodiment is provided in a machine tool, and detects the position of a workpiece to be machined on a table of the machine tool to measure a machining reference point or the like.
(embodiment mode 1)
As shown in fig. 1, the workpiece detection apparatus 100 of the present embodiment includes a probe 10 and a main body 20. The probe 10 of the workpiece detection apparatus 100 moves within a predetermined range to perform contact detection for detecting whether or not the probe 10 is in contact with the workpiece W. The workpiece detection apparatus 100 determines the coordinates of the workpiece W using the result of the contact detection. Hereinafter, these processes are also referred to as workpiece position detection.
The probe 10 includes a housing 1 and a stylus 3 having a contact ball 2 at a tip end thereof. The housing 1 is used to hold the contact pin 3. The stylus 3 is perpendicular to the platform. The stylus 3 is deformable and resilient from a state perpendicular to the platform to a direction along the upper surface of the platform. The probe 10 includes a communication unit 11 and a sensor 12.
The sensor 12 detects vibration, deformation, or the like of the stylus 3 to detect whether the contact ball 2 is in contact with the workpiece W. When the contact ball 2 comes into contact with the workpiece W, the sensor 12 outputs a simulated detection signal indicating the contact.
The communication unit 11 converts the analog probe signal into a digital signal and transmits the digital signal to the main body 20 by a wired or wireless method. The digital signal indicates "1" when the contact ball 2 is in contact with the workpiece W and "0" when the contact ball 2 is not in contact with the workpiece W. Hereinafter, the digital signal is referred to as a touch signal.
The main body 20 includes a communication unit 21, an interference detection unit 22, a drive mechanism 23, a data processing unit 24, an output unit 25, and a storage unit 26. The communication section 21 receives a contact signal from the probe 10. The storage unit 26 stores the contact signal received by the communication unit 21. The interference detection unit 22 detects whether or not there is interference at the time of contact detection. The disturbance includes a friction torque, a torque due to the influence of gravity, a torque due to the disturbance of other shafts, and a torque due to the influence of other devices in the periphery. The values of these torques can be calculated based on the speed of a drive motor that drives the probe 10, and the like. Specifically, the disturbance detection unit 22 calculates a value of the disturbance based on a value obtained by subtracting the estimated torque from the output torque of the drive motor. The output torque of the drive motor is acquired from the drive mechanism 23, and the estimated torque is calculated from the speed of the drive motor. The interference detection unit 22 of the present embodiment also detects torque generated by the influence of the drive motor that drives the probe 10 as interference. The interference detection unit 22 determines that interference is present when the value of the detected interference is equal to or greater than a predetermined threshold value. The interference detection unit 22 generates an interference signal indicating the presence or absence of interference detection based on the result of the determination. The storage unit 26 stores the interference signal. The interference signal is a digital signal that represents "1" when interference is present and represents "0" when interference is not present.
The drive mechanism 23 (drive motor) includes a moving mechanism for moving the probe 10 along the X axis (left-right direction), the Y axis (front-back direction), and the Z axis (up-down direction). The probe 10 is attached to the holder in the same manner as the tool, and moves together with the holder. Therefore, the moving mechanism includes a servomotor for moving the holder, a servo amplifier for controlling the servomotor, and the like.
The output unit 25 outputs predetermined information to the user of the workpiece detection apparatus 100. The output unit 25 may be a speaker, a lamp, a display unit, or the like. The storage unit 26 is a nonvolatile storage medium such as a flash memory, an EEPROM (registered trademark), an HDD, an MRAM (magnetoresistive memory), an FeRAM (ferroelectric memory), and an OUM. The storage unit 26 stores a control program for detecting the position of the workpiece. The storage unit 26 stores the contact signal received by the communication unit 21 and an interference signal indicating the result of the interference detection by the interference detection unit 22.
The data processing unit 24 determines the position of the workpiece W (coordinates of the X, Y, and Z axes) based on the contact signal and the interference signal stored in the storage unit 26 during the workpiece position detection process and the rotational position of the servomotor that can be acquired from the servo amplifier.
The probe 10 and the interference detecting section 22 continuously emit a contact signal and an interference signal in time series. The storage unit 26 stores the touch signal and the interference signal every time the signals are transmitted. In the process of workpiece position detection, the workpiece position detection is performed by acquiring the contact signal and the interference signal from the storage unit 26 at fixed time intervals, that is, at fixed intervals.
The workpiece detection apparatus 100 of the present embodiment is not limited to this, and may be configured such that the probe 10 emits a contact signal at a fixed cycle.
As shown in fig. 2, the data processing unit 24 of the workpiece detection apparatus 100 according to embodiment 1 includes a CPU 241, an acquisition unit 242, an interference determination unit 243, a coordinate determination unit 244, an invalidation unit 245, and a notification unit 246.
The CPU 241 loads and executes a control program stored in advance in a ROM (not shown) on a RAM (not shown), and controls the various hardware described above.
The acquisition section 242 periodically reads the contact signal from the storage section 26 to perform acquisition. One cycle is 125 mus.
When the acquisition contact signal acquired by the acquisition unit 242 indicates that contact with the workpiece W is present, the interference determination unit 243 determines whether or not interference is present within a predetermined time period before the acquisition unit 242 acquires the contact signal. Specifically, when the acquisition unit 242 acquires the contact signal "1", it is determined whether or not a disturbance is present within a predetermined time (for example, one cycle) before the acquisition unit 242 acquires the contact signal. The interference determination unit 243 performs the determination based on the interference signal stored in the storage unit 26.
The workpiece detection apparatus 100 of the present embodiment is not limited to this, and the predetermined time may be two cycles or three cycles.
The coordinate determination unit 244 determines the coordinates of the workpiece W based on the acquired contact signal, the determination result of the interference determination unit 243, and the rotational position of the servo motor acquired from the servo amplifier.
That is, when the contact signal is acquired as "1" and there is no disturbance within a predetermined time before the acquisition of the contact signal, the coordinate determination unit 244 determines the coordinates of the workpiece W based on the rotational position of the servomotor.
The invalidation unit 245 invalidates the acquired contact signal based on the determination result of the interference determination unit 243. When the interference determination unit 243 determines that there is interference within a predetermined time before the acquisition of the contact signal, the invalidation unit 245 invalidates the acquisition of the contact signal. At this time, the coordinate determination unit 244 does not determine the coordinates of the workpiece W.
The notification unit 246 notifies the user based on the determination result of the interference determination unit 243. When the interference determination unit 243 determines that there is interference within a predetermined time period before the acquisition of the contact signal, the notification unit 246 notifies the user of the fact via the output unit 25. The notification unit 246 gives an alarm to light a lamp or displays an error.
The process of workpiece position detection is schematically described based on fig. 3 and 4. Fig. 3 shows a state where no interference is present, and fig. 4 shows a state where interference is present. The dotted lines of fig. 3 and 4 show the period of acquiring the contact signal.
The probe 10 performs contact detection during constant-speed movement at a fixed speed, and emits a detection signal indicating the detection result. The probe 10 transmits a contact signal obtained based on the probe signal to the main body 20, and the storage unit 26 stores the contact signal in time series. When the workpiece W is in contact with the probe 10, the probe 10 transmits a contact signal of "1" to the main body 20. When the workpiece W is not in contact with the probe 10, the probe 10 transmits a contact signal of "0" to the body 20. The storage unit 26 stores interference signals indicating whether or not interference is detected in time series.
The workpiece detection apparatus 100 according to embodiment 1 periodically acquires a contact signal from the storage unit 26, and determines whether or not the contact signal is "1". When the contact signal is "1", it is determined whether or not a disturbance is present within a predetermined time before the contact signal is acquired. That is, it is confirmed whether the value of the interference signal within the predetermined time before the acquisition of the contact signal is "0" or "1".
When the value of the interference signal is "0" (see the hatched portion in fig. 3), it indicates that no interference is present within a predetermined time before the acquisition of the contact signal. When the probe 10 detects the contact of the workpiece W, the detection result is accurate because there is no disturbance. Therefore, the coordinate determination unit 244 determines the coordinates of the workpiece W based on the rotational position of the servomotor at the time of acquiring the contact signal.
When the value of the interference signal is "1" (see the hatched portion in fig. 4), it indicates that interference is present within a predetermined time before the contact signal is acquired. When the probe 10 detects the contact of the workpiece W, the detection result may be inaccurate because of the presence of the disturbance. Therefore, the nullifying unit 245 nullifies the acquired contact signal.
The process of detecting the workpiece position according to embodiment 1 will be described with reference to fig. 5.
The CPU 241 instructs the interference detection unit 22 to perform interference detection, and the interference detection unit 22 starts the interference detection (step S101). Next, the CPU 241 starts contact detection (step S102). The CPU 241 instructs the probe 10 to start contact detection, and detects whether or not the probe 10 is in contact with the workpiece W while moving in the X-axis, Y-axis, or Z-axis direction. The CPU 241 instructs a timer unit (not shown) to count time, and determines whether or not one cycle (125 μ S) has elapsed based on the result of the counting by the timer unit (step S103). When the CPU 241 determines that one cycle has not elapsed (NO in step S103), it repeats the determination until one cycle has elapsed.
When the CPU 241 determines that one cycle has elapsed (YES in step S103), the CPU 241 instructs the acquisition section 242 to read the contact signal from the storage section 26 (step S104). The CPU 241 determines whether there is contact with the workpiece W, i.e., whether the value of the acquired contact signal is "1" (step S105). When determining that the value of the acquired contact signal is not "1" (no in step S105), the CPU 241 returns the process to step S103. When the CPU 241 determines that the value for acquiring the contact signal is "1" (yes in step S105), the contact detection is temporarily suspended (step S106), and the probe 10 is stopped.
Next, the CPU 241 instructs the interference determination unit 243 to perform the determination, and the interference determination unit 243 determines whether or not there is interference in one cycle before the acquisition of the contact signal (step S107). When the interference determination unit 243 determines that there is no interference within one cycle before the acquisition of the contact signal (no in step S107), the CPU 241 instructs the coordinate determination unit 244 to determine the coordinates of the workpiece W, and the coordinate determination unit 244 determines the coordinates of the workpiece W on the X-axis, the Y-axis, or the Z-axis based on the rotational position of the servomotor (step S108).
When the interference determination unit 243 determines that there is interference in one cycle before the acquisition of the acquisition contact signal (yes in step S107), the CPU 241 instructs the invalidation unit 245 to invalidate the acquisition contact signal, and the invalidation unit 245 invalidates the acquisition contact signal, that is, the contact signal acquired in step S104 (step S109). The CPU 241 instructs the notification unit 246 to notify the user, and the notification unit 246 notifies the user of the presence of interference via the output unit 25 (step S110).
The workpiece detection apparatus 100 of the present embodiment is not limited to the above description. If the invalidation unit 245 invalidates the acquired contact signal in step S109, the CPU 241 may return the process to step S102. That is, when the invalidation unit 245 invalidates the acquired contact signal, the contact detection may be performed again.
As described above, in the workpiece detection apparatus 100 of the present embodiment, even when the probe 10 detects contact with the workpiece W, if there is a disturbance for a predetermined time before that, the detection result is regarded as an inaccurate detection result and is invalidated. Therefore, the accuracy of workpiece position detection can be improved.
(embodiment mode 2)
As shown in fig. 6, the data processing unit 24 of the workpiece detection apparatus 100 according to embodiment 2 includes a CPU 241, an acquisition unit 242, an interference determination unit 243, a coordinate determination unit 244, an invalidation unit 245, and a notification unit 246, as in embodiment 1. The data processing section 24 also has a speed changing section 247. The CPU 241, the acquisition unit 242, the interference determination unit 243, the coordinate determination unit 244, the invalidation unit 245, and the notification unit 246 are the same as those in embodiment 1, and therefore, description thereof is omitted.
When the interference determination unit 243 determines that there is interference within a predetermined time before the contact signal acquisition time, the transmission unit 247 changes the movement speed of the probe 10 during contact detection. That is, the transmission unit 247 changes the moving speed of the probe 10 and changes the torque of the drive motor that drives the probe 10. The reason is that the determination result of the disturbance detection unit 22 regarding the presence or absence of disturbance may be changed when the torque of the drive motor is reduced. The transmission 247 controls a servo amplifier of the drive mechanism 23 to change the moving speed of the probe 10.
When the speed of movement of the probe 10 is changed by the transmission unit 247 after contact (contact detection) with the workpiece W is detected within the predetermined range, the probe 10 performs contact detection again within the predetermined range. That is, in the example of fig. 5, after step S109, the transmission 247 changes the moving speed of the probe 10 and returns the process to step S102.
As described above, in the workpiece detection apparatus 100 of the present embodiment, even when the probe 10 detects contact with the workpiece W, the contact detection is performed again by changing the moving speed of the probe 10 when there is a disturbance within a predetermined time before. Therefore, the workpiece detection apparatus 100 can improve the accuracy of workpiece position detection.
(embodiment mode 3)
The data processing unit 24 of the workpiece detection apparatus 100 according to embodiment 3 includes a CPU 241, an acquisition unit 242, a disturbance determination unit 243, a coordinate determination unit 244, a nullification unit 245, a notification unit 246, and a shift unit 247, as in embodiment 2. The CPU 241, the acquisition unit 242, the interference determination unit 243, the coordinate determination unit 244, the invalidation unit 245, the notification unit 246, and the shift unit 247 are the same as those of embodiments 1 and 2, and therefore, description thereof is omitted.
In the workpiece detection apparatus 100 according to embodiment 3, when the moving speed of the probe 10 at the time of contact detection is changed, the interference determination unit 243 determines whether or not there is interference from before the predetermined time.
For example, when the interference determination unit 243 determines that interference is present within a predetermined time (for example, within one cycle) before the contact signal acquisition time, the speed change unit 247 changes the movement speed of the probe 10. Thereafter, when the contact detection is performed again, the interference determination unit 243 determines that there is no interference from the predetermined time, that is, one cycle before. That is, when the moving speed of the probe 10 becomes fast (for example, 500mm/sec), the vibration/deformation of the stylus 3 of the probe 10 becomes large. Therefore, the interference determination unit 243 determines whether or not interference is present in three cycles before the contact signal is acquired. At this time, the interference determination unit 243 determines that there is interference only when the value of the interference signal is "1" during all three periods.
When the moving speed of the probe 10 becomes slow (for example, 50mm/sec), the vibration/deformation of the stylus 3 of the probe 10 becomes small. Therefore, the interference determination unit 243 may be configured to determine whether or not there is interference in one cycle before the contact signal acquisition, as in the case before the movement speed of the probe 10 changes.
As described above, in the workpiece detection apparatus 100 of the present embodiment, even if the probe 10 detects contact with the workpiece W, the contact detection is performed again by changing the moving speed of the probe 10 when the interference is present within the predetermined time period before that. The interference determination unit 243 determines whether or not there is interference from the predetermined time onward. Therefore, the workpiece detection apparatus 100 has an effect of being able to improve the accuracy of workpiece position detection.
The acquisition unit 242, the interference determination unit 243, the coordinate determination unit 244, the invalidation unit 245, the notification unit 246, and the shift unit 247 may be configured based on hardware logic, or may be configured in a software manner by executing a predetermined program by the CPU 241.
(embodiment mode 4)
As shown in fig. 7, a computer program for operating the workpiece detection apparatus 100 according to embodiment 4 can be provided from a portable recording medium a such as a USB (universal serial bus) memory via the I/F27. The workpiece detection apparatus 100 according to the present embodiment may download the computer program from an external device (not shown) via the communication unit 21. The contents of which will be described below. The same portions as those in embodiment 1 are denoted by the same reference numerals and description thereof is omitted.
The workpiece detection device 100 may include an external (or internal) recording medium reading device (not shown). The recording medium reading device acquires the contact signal, and determines whether or not a disturbance has occurred within a predetermined time before when the acquired contact signal indicates that contact with the workpiece has occurred. The recording medium reading device is inserted with a portable recording medium a in which a program or the like for determining the coordinates of the workpiece based on the result of the determination is recorded, and the CPU 241 installs the program in a ROM (not shown). The CPU 241 loads and executes the program into a RAM (not shown).
The recording medium may be a program medium, or a medium that fixedly carries a program code, such as a tape such as a magnetic tape or a cassette, a magnetic disk such as a flexible disk or a hard disk, an optical disk such as a CD-ROM/MO/MD/DVD, a card such as an IC card (including a memory card) or an optical card, or a semiconductor memory including a mask ROM, an EPROM, an EEPROM, a flash ROM, or the like.
Claims (5)
1. A workpiece detection device (100) is provided with: a probe (10) that detects whether or not contact with the workpiece (W) is made within a predetermined range, and that emits a contact signal indicating the detection result; and a coordinate determination unit (244) for determining the coordinates of the workpiece based on the contact signal from the probe,
the workpiece detection device further includes:
an interference detection unit (22) that detects whether or not interference is present;
an interference determination unit (243) that determines whether or not the interference detection unit detects the presence of interference within a predetermined time period before the probe issues a contact signal indicating the presence of contact with the workpiece, when the probe issues the contact signal; and
an invalidation unit (245) that performs processing to invalidate the contact signal that is transmitted when the interference determination unit determines that the interference detection unit has detected the presence of interference within a predetermined time period before the contact signal is transmitted,
wherein the coordinate determination unit determines the coordinates of the workpiece based on the determination result of the interference determination unit and the processing of the invalid portion.
2. The workpiece inspection apparatus according to claim 1,
further comprises a drive motor (23), the drive motor (23) driving the probe,
the disturbance includes a load of the drive motor.
3. The workpiece detecting apparatus according to claim 1 or 2,
further comprising a speed change unit (247), wherein the speed change unit (247) changes the moving speed of the probe when the interference determination unit determines that the interference detection unit detects the presence of the interference within a predetermined time period before the contact signal is emitted,
when the speed change unit changes the moving speed of the probe, the probe performs the probing within the predetermined range again.
4. The workpiece inspection apparatus according to claim 3,
the interference determination unit determines whether or not interference is present for a time longer than the predetermined time when the speed change unit changes the moving speed of the probe.
5. A workpiece detection method for detecting the position of a workpiece (W) by a workpiece detection device, the workpiece detection device comprising: a probe (10) that detects whether or not the workpiece is in contact with the probe within a predetermined range, and that emits a contact signal indicating a detection result; and a coordinate determination unit (244) for determining the coordinates of the workpiece based on the contact signal from the probe,
the work detection device is further provided with an interference detection unit (22), wherein the interference detection unit (22) detects whether or not interference exists,
the workpiece detection method comprises the following steps:
an interference determination step of determining whether or not the interference detection unit detects the presence of interference within a predetermined time period before the probe issues a contact signal indicating the presence of contact with the workpiece;
an invalidation step of performing a process of invalidating the contact signal that is transmitted when the interference detection unit detects the presence of interference within a predetermined time before the contact signal is transmitted in the interference determination step; and
determining coordinates of the workpiece based on a determination result in the interference determining step and processing in the nulling step.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017167816A JP6834854B2 (en) | 2017-08-31 | 2017-08-31 | Work detection device, work detection method and computer program |
| JP2017-167816 | 2017-08-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109420933A CN109420933A (en) | 2019-03-05 |
| CN109420933B true CN109420933B (en) | 2021-03-26 |
Family
ID=65514718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810974336.6A Active CN109420933B (en) | 2017-08-31 | 2018-08-24 | Workpiece detection device and workpiece detection method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6834854B2 (en) |
| CN (1) | CN109420933B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6898966B2 (en) * | 2019-06-07 | 2021-07-07 | 株式会社ミツトヨ | Defect judgment unit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010018250A1 (en) * | 2010-04-23 | 2011-10-27 | Carl Zeiss Industrielle Messtechnik Gmbh | Method for measuring coordinates on workpieces on a coordinate measuring machine |
| JP5311294B2 (en) * | 2010-04-28 | 2013-10-09 | 株式会社安川電機 | Robot contact position detector |
| JP5911565B2 (en) * | 2012-04-17 | 2016-04-27 | 株式会社牧野フライス製作所 | Machine tool interference judgment method and interference judgment device |
| JP6240133B2 (en) * | 2015-09-18 | 2017-11-29 | ファナック株式会社 | Spot welding system that measures the position of the spot where welding is performed |
-
2017
- 2017-08-31 JP JP2017167816A patent/JP6834854B2/en active Active
-
2018
- 2018-08-24 CN CN201810974336.6A patent/CN109420933B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2019045269A (en) | 2019-03-22 |
| CN109420933A (en) | 2019-03-05 |
| JP6834854B2 (en) | 2021-02-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6622216B2 (en) | Calibration of measuring probe | |
| US10837752B2 (en) | Method for capturing dynamic vibrations of a roughness sensor, method for measuring a roughness of a workpiece surface, computer program product and measuring device configured to carry out the methods | |
| US9157722B2 (en) | Touch trigger measurement probe | |
| EP2013571B1 (en) | Method of error correction | |
| US10591268B2 (en) | Feeler for workpieces being machined | |
| JP5523995B2 (en) | measuring device | |
| US8164847B2 (en) | Fall detection device, magnetic disk device, and portable electronic apparatus | |
| GB2425840A (en) | Error correction of workpiece measurements | |
| CN109420933B (en) | Workpiece detection device and workpiece detection method | |
| EP3382327B1 (en) | Compact coordinate measurement machine configuration with large working volume relative to size | |
| TWI659214B (en) | Inspection apparatus and a method of operating an inspection apparatus | |
| CN112050710A (en) | Coordinate measuring machine and computer-readable storage medium | |
| JP5639836B2 (en) | measuring device | |
| JP5371532B2 (en) | CMM | |
| CN110977612A (en) | CNC (computer numerical control) machining online measurement error correction method and system | |
| WO2019155698A1 (en) | Surface shape measurement device | |
| JP2021179379A (en) | Shape measurement device and control method therefor | |
| JP2016129927A (en) | Method for compensating temperature-induced deviations in grinding machine, and machine corresponding to said method | |
| JP2020071029A (en) | Measurement system, control method of measurement operation, and determination method for sign of failure | |
| US20220146246A1 (en) | Form measuring instrument and method of detecting abnormality | |
| JP2019100899A (en) | Laser device and measurement system | |
| JP7038308B2 (en) | Surface shape measuring machine | |
| JPH1133880A (en) | Measuring device of nc lathe | |
| JPH0731254U (en) | Numerical control device | |
| JP2012083821A (en) | Numerical control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |