WO2023132157A1

WO2023132157A1 - Machine tool

Info

Publication number: WO2023132157A1
Application number: PCT/JP2022/043945
Authority: WO
Inventors: 静雄西川
Original assignee: Dmg森精機株式会社
Priority date: 2022-01-06
Filing date: 2022-11-29
Publication date: 2023-07-13
Also published as: JP7046292B1; JP2023100396A

Abstract

This machine tool executes a foreign matter elimination operation after machining of a workpiece has been completed (step SA2), then executes foreign matter detection processing using a foreign matter detection unit (step SA3). The machine tool then executes, on the basis of the processing results, determination processing of determining whether foreign matter is attached to a site of the workpiece to be measured (step SA4). If as a result of the determination processing it is determined that no foreign matter is attached (NO in step SA4), the machine tool causes a measurement unit to execute in-machine measurement (step SA6), and if foreign matter is determined to be attached (YES in step SA4), in-machine measurement by the measurement unit is not executed, and foreign matter attachment information indicating that foreign matter is attached to the site to be measured is issued as a notification by the notification unit (step SA7).

Description

Machine Tools

The present invention relates to a machine tool equipped with a measurement unit that performs on-machine measurement of a workpiece that has been machined.

In the field of machining, it has been traditional to measure various dimensions of a machined work without removing it from the machine tool (hereinafter referred to as on-machine measurement). On-machine measurement is performed, for example, by attaching a measurement probe to the spindle of a machine tool and moving the probe along the surface of the workpiece using a feed mechanism of the machine tool. On-machine measurement can be broadly classified into two methods, a contact method and a non-contact method. In the contact method, measurement is performed while the tip of the probe is in contact with the surface of the work, while in the non-contact method, measurement is performed with the tip of the probe slightly separated from the surface of the work. Regardless of which method is used, if chips or the like adhere to the surface of the workpiece, there is a problem that the chips adhere to the tip of the probe during measurement, or that the chips are erroneously measured as the surface shape of the workpiece. . In order to avoid such a problem, for example, in the machine tool disclosed in Patent Literature 1, the workpiece is cleaned by a cleaning device before starting on-machine measurement.

JP 2015-011530 A

In the machine tool disclosed in Patent Document 1, the workpiece is cleaned before on-machine measurement is started. may not be able to be removed immediately. If the on-machine measurement process is executed with foreign matter remaining on the surface of the workpiece, the measured values obtained by the probe show abnormal values due to the influence of the foreign matter, which causes erroneous measurement. If such an erroneous measurement occurs, for example, even if the workpiece is actually processed to normal dimensions, an abnormal value is measured by the on-machine measurement, and the operator moves the workpiece out of the machine. There is a risk that the measurement may be forced to be manually redone, or defective products may be produced due to erroneous measurement that is judged to meet the design requirements even though the machining dimensions of the workpiece do not meet the design requirements.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a machine tool equipped with a measuring unit for performing on-machine measurement of a workpiece that has been machined. The purpose is to prevent erroneous measurement due to the influence of foreign matter left on the surface of the

The present invention for solving the above problems,
A machine tool comprising a machining mechanism section for machining a workpiece and a measurement section for performing on-machine measurement of the workpiece that has been machined by the machining mechanism section,
a foreign matter detection unit capable of detecting foreign matter adhering to a measurement target portion of the workpiece after the completion of machining;
a foreign matter removing unit capable of executing a foreign matter removing operation for removing foreign matter adhering to a measurement target portion of the workpiece after the completion of machining;
a notification unit capable of reporting foreign matter adhesion information including the fact that a foreign matter is adhered to a measurement target portion of the workpiece;
A control unit that controls the operation of the measurement unit, the foreign matter removal unit, and the notification unit,
When the processing of the workpiece by the machining mechanism is completed, the control unit causes the foreign matter removing unit to perform the foreign matter removing operation, and causes the foreign matter detecting unit to perform foreign matter detection processing on the work after the foreign matter removing operation is completed. If a determination process is performed to determine whether or not foreign matter adheres to the measurement target portion of the workpiece based on the processing result, and it is determined that there is no foreign matter adhered as a result of the determination processing the measurement unit is caused to perform the on-machine measurement, and when it is determined that a foreign object is attached, the on-machine measurement by the measurement unit is not executed, and the information on the foreign object adhesion is sent to the notification unit. It relates to a machine tool configured to notify.

According to this machine tool, when the machining of the workpiece by the machining mechanism section is completed, the foreign matter removing section, under the control of the control section, executes a foreign matter removing operation for removing foreign matter adhering to the measurement target portion of the workpiece. . After the foreign matter removal operation by the foreign matter removal section is completed, the foreign matter detection section executes foreign matter detection processing for detecting foreign matter adhering to the measurement target portion of the workpiece under the control of the control section. Based on the result of this foreign matter detection processing, the control unit executes a determination processing as to whether or not a foreign matter adheres to the measurement target portion of the workpiece. As a result of this determination process, if it is determined that there is no foreign matter adhering to the part of the workpiece to be measured, that is, if it is assumed that erroneous measurement due to the influence of foreign matter will not occur, measurement is performed under the control of the control unit. The department performs on-machine measurement of the workpiece. On the other hand, as a result of the determination process, if it is determined that there is a foreign substance adhering to the measurement target portion of the workpiece, that is, if it is assumed that there is a high possibility that erroneous measurement will occur due to the influence of the foreign substance, the control Under the control of the unit, the measurement unit does not perform on-machine measurement, and the notification unit notifies that foreign matter is attached to the measurement target portion of the workpiece as foreign matter adhesion information.

Therefore, it is possible to prevent the measurement unit from performing on-machine measurement with foreign matter attached to the measurement target portion of the workpiece. In addition, it is possible to prevent the occurrence of erroneous measurement due to abnormal values measured by the measuring unit due to the influence of adhesion of foreign matter. In addition, when the information about the adhesion of foreign matter is notified by the notification unit, the worker receives this notification, recognizes that the foreign matter is attached to the measurement target portion of the work, and moves the work out of the machine. Countermeasures such as manual measurement of dimensions can be taken.

When it is determined that a foreign object is attached to the measurement target site as a result of the determination process, the control unit causes the foreign material removal unit to perform the foreign material removal operation, and then executes the determination process again. The process is repeatedly executed until it is determined that there is no adhesion of foreign matter in the determination processing, and if the determination result that there is no adhesion of foreign matter is obtained in the determination processing, on-machine measurement is performed by the measurement unit. On the other hand, it is preferable that the notification unit is configured to notify the foreign matter adhesion information when a determination result indicating that there is no adhesion of foreign matter is not obtained even after repeating the control processing a predetermined number of times.

According to this configuration, the foreign matter removing operation by the foreign matter removing unit and the foreign matter adhesion determination processing in the control unit are repeatedly executed until the determination processing determines that no foreign matter has adhered. Therefore, for example, even if there is foreign matter adhered so strongly that it cannot be removed by a single foreign matter removing operation, the foreign matter can be easily removed by repeating the foreign matter removing operation. Further, if the foreign matter cannot be removed even after the foreign matter removing operation is repeated a predetermined number of times, the notification unit notifies that the foreign matter is attached to the measurement target site as foreign matter adhesion information. As a result, the operator can recognize that a foreign object is attached to the measurement target site, and can take countermeasures such as moving the workpiece out of the machine and performing manual measurement.

The control unit has a plurality of measurement target regions, the foreign object detection unit is configured to detect foreign substances adhering to each of the plurality of measurement target regions, and the control unit detects a plurality of measurement target regions. The determination process is executed for each of the target parts, and when it is determined that a foreign object is attached to at least one measurement target part based on the result of the determination process, the foreign object is attached as the foreign object adhesion information. It is preferable that the notifying unit is configured to notify the foreign matter adhesion information including information that can identify the measurement target site to which the foreign matter is attached, in addition to the fact that the foreign matter is attached.

According to this configuration, for each of the plurality of measurement target sites, the control unit executes the determination process of whether or not a foreign object is attached based on the result of the foreign object detection process by the foreign object detection unit. Then, in the control unit, when it is determined that a foreign object is attached to at least one of the plurality of measurement target sites based on the results of these determination processes, the notification unit, under the control of the control unit, Foreign matter adhesion information including information to the effect that foreign matter is adhered to the measurement target site and information capable of specifying the measurement target site to which the foreign matter is adhered is reported. According to this, compared with the case where the notifying unit simply notifies that the foreign matter is attached, the operator can easily specify the location where the foreign matter is attached. Therefore, the worker can quickly remove the foreign matter when manually measuring the dimensions of the work.

The notification unit includes a display unit for displaying the foreign matter adhesion information, and the foreign matter adhesion information displays the position of the dimension measured by the measurement unit on an image simulating the shape of the workpiece. Moreover, it is preferable that the image information indicates whether or not there is adhesion of a foreign substance to the measurement target portion corresponding to the displayed dimension.

According to this configuration, foreign matter adhesion information is displayed on the display section (notification section) under the control of the control section. This foreign matter adhesion information displays the position of the dimension measured by the measuring unit on an image simulating the shape of the workpiece, and indicates whether or not there is adhesion of foreign matter to the measurement target portion corresponding to the displayed dimension. consists of the image information shown. Accordingly, the operator can visually identify the portion to which the foreign matter is attached among the plurality of measurement target portions by viewing the image information (foreign matter adhesion information) displayed on the display unit.

Even if it is determined that a foreign object is adhered to at least one measurement target region as a result of the determination process, the control unit determines that there is no foreign substance adhered to the measurement target region. and causing the measurement unit to perform on-machine measurement of the dimensions corresponding to the measurement target portion, and to display the measurement result on the display unit.

According to this, on-machine measurement is performed by the measurement unit for the dimensions corresponding to the measurement target part where no foreign matter is attached. Therefore, it is possible to prevent the on-machine measurement of all dimensions by the measuring unit from being stopped, and by extension, to improve the measurement efficiency of the on-machine measurement.

As described above, according to the machine tool of the present invention, after the foreign matter removal operation is executed after the completion of machining of the workpiece, the foreign matter detection process is executed by the foreign matter detection unit, and the workpiece is measured based on the processing result. Determination processing is performed to determine whether or not a foreign object adheres to the target portion. When it is determined that no foreign object is adhered as a result of the determination processing, the measurement unit is caused to perform on-machine measurement, while the foreign object is detected. When it is determined that there is adhesion of , the on-machine measurement by the measurement unit is not executed, and the notification unit is notified of foreign matter adhesion information that foreign matter is adhered to the measurement target part. In addition, it is possible to prevent erroneous measurement of dimensions due to the influence of foreign matter remaining on the surface of the workpiece after the completion of machining.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the machine tool which concerns on Embodiment 1 of this invention. 1 is a block diagram showing a control system of a machine tool; FIG. FIG. 4 is a schematic perspective view showing various dimensions of a workpiece measured by on-machine measurement; 4 is a flowchart showing an example of preprocessing control executed before on-machine measurement; 4 equivalent view showing Embodiment 2 of the present invention. FIG. FIG. 9 is a schematic diagram showing an example of foreign matter adhesion information displayed on a display unit in the machine tool according to Embodiment 2 of the present invention.

Specific embodiments of the present invention will be described below with reference to the drawings.

<<Embodiment 1>>
FIG. 1 is a perspective view showing a machine tool 1 according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the construction of a control system of the machine tool 1. As shown in FIG. The machine tool 1 includes an on-machine measurement system 50 (an example of a measurement unit) capable of measuring various dimensions of the work W after the completion of machining while the work W is set in the machine. The machine tool 1 executes preprocessing control before execution of on-machine measurement in order to prevent the on-machine measurement system 50 from performing measurement with foreign matter such as chips adhering to the workpiece W. It is configured. Details of the preprocessing control and the onboard measurement system 50 will be described later.

FIG. 3 shows an example of the workpiece W after the completion of machining. In this example, the workpiece W is a columnar body that has a convex shape when viewed from the front side of the machine tool 1, and the on-machine measurement system 50 is shown in the figure. Measure the six dimensions AF shown. The on-machine measurement system 50 uses a laser measurement head 51, which will be described later, to acquire distance data to a predetermined measurement target site, and measures (calculates) dimensions A to F based on the acquired distance data. Here, the measurement target part is a part whose position information needs to be acquired when measuring each dimension A to F. For example, the measurement target part corresponding to the dimension B is the width direction (X The measurement target portion corresponding to the dimension E is the inner peripheral surface of the circular hole 13, and the measurement target portion corresponding to the dimension F is the depth direction (Y-axis direction) of the workpiece W. Both sides. Although the description is omitted, the measurement target portion can be determined for the other dimensions A, C, and D based on the same concept.

Returning to FIG. 1, the machine tool 1 includes a bed 2, a column 3 arranged on the bed 2, and a spindle head 4 supported by the column 3 and movable in the vertical direction (Z-axis direction). , a spindle 5 supported by a spindle head 4 whose axis is parallel to the Z-axis and rotatable about the axis, a spindle 5 on which a tool is mounted, and a saddle arranged horizontally (in the Y-axis direction) on the bed 2 so as to be movable. 6, and a table 7 which is disposed on the saddle 6 so as to be movable in the X-axis direction orthogonal to both the Z-axis and the Y-axis, and has a work W placed thereon. The main shaft 5 has a tapered hole opening at the tip end face, and a collet and a draw bar for fixing a tool are arranged in the tapered hole. The tool is detachable.

As shown in FIG. 2, the machine tool 1 further includes a feed mechanism unit 11 for feeding in each axial direction, a tool changer 10 for exchanging the tool mounted on the spindle 5 with a new tool, and a pretreatment control unit. It includes a workpiece cleaning device 30 and a foreign matter detection system 40 (an example of a foreign matter detection unit) that operate occasionally, the on-machine measurement system 50 , and a control device 20 that controls the overall operation of the machine tool 1 .

The feed mechanism section 11 changes the relative positional relationship between the tool mounted on the spindle 5 and the workpiece W under the control of the control device 20 . Thereby, the workpiece W is processed into a desired shape. A laser measuring head 51, which will be described later, can be attached to the spindle 5 in place of a tool. The laser measurement head 51 is a part of the on-machine measurement system 50 as will be described later, and is configured to be able to measure the distance between the workpiece W set on the table 7 and the part to be measured.

The tool changer 10 has a tool magazine for storing a plurality of tools, and a change mechanism for exchanging the tools stored in the tool magazine with the tools mounted on the spindle 5, although not shown. This exchange mechanism first pulls out the tool attached to the spindle 5 and then attaches a new tool to the spindle 5 . The tool magazine stores the laser measuring head 51 in addition to the tools, and the tool changer 10 is configured so that the laser measuring head 51 can be mounted on the spindle 5 instead of the tools.

The work cleaning device 30 is configured to clean and remove foreign matter such as chips by discharging coolant toward the surface of the work W. Specifically, the work cleaning device 30 includes a manifold attached to the spindle head 4 , a pipe branched from the manifold to supply coolant toward the work surface, and a coolant tank provided on the back side of the machine tool 1 . and a coolant pump (both not shown) that guides coolant from the manifold to the manifold.

The foreign matter detection system 40 includes a pair of imaging cameras 41 capable of imaging an image of the workpiece W after the completion of machining set on the table 7, and based on the images captured by the pair of imaging cameras 41, a portion of the workpiece surface to be measured. and an image processing device 42 for detecting adhering foreign matter.

A pair of imaging cameras 41 are attached to the ceiling wall of the splash guard 12 that defines the exterior of the machine tool 1, as shown in FIG. Each imaging camera 41 is composed of, for example, a CCD camera or a CMOS camera, and is arranged symmetrically with respect to the axis of the spindle head 4 when viewed from the front side of the machine tool 1 . Each image pickup camera 41 is arranged with an inclination such that the optical axis of each image pickup camera 41 faces downward from the spindle head 4 . Each image pickup camera 41 executes an image pickup operation upon receiving an image pickup command from the control device 20, and picks up images of the left half portion and the right half portion of the work W, respectively. Then, each imaging camera 41 transmits the image data of the imaged work W to the image processing device 42 (see FIG. 2).

The image processing device 42 has an image data acquisition section 42a and a detection processing section 42b. The image processing device 42 is configured by a computer having a CPU, ROM, and RAM, and the functions of the image data acquisition unit 42a and the detection processing unit 42b are realized by computer programs. , the image data captured by each imaging camera 41 is obtained as digital data in which the arrangement position of each pixel and the luminance value are associated with each other.

The detection processing unit 42b detects whether or not a foreign object adheres to the measurement target site of the workpiece W by comparing the captured image data of each imaging camera 41 acquired by the image data acquisition unit 42a with the reference image. Here, the reference image is an image of the workpiece W in which foreign matter is not attached to the measurement target site, and is stored in advance in a storage unit (not shown).

The detection processing unit 42b determines by pattern matching whether or not an image of foreign matter such as scraps exists in a portion corresponding to the measurement target site in the difference image between the captured image and the reference image. The foreign matter detection method is not limited to pattern matching. For example, it is possible to perform machine learning by inputting an image in which a foreign matter adheres to a measurement target site and an image in which no foreign matter adheres to a computer. A foreign object detection learning model may be generated, and foreign object detection may be performed using the generated learning model.

The on-machine measurement system 50 measures various dimensions of the workpiece W without contact using the principle of a laser displacement gauge. Specifically, the on-machine measurement system 50 has a laser measurement head 51 detachably attached to the spindle 5 and a measurement data processing device 52 . The laser measurement head 51 has a laser oscillator 51a, a light receiving sensor 51b, and a wireless communication section 51c, which are built in the head body. The laser measuring head 51 is stored in the tool magazine of the tool changer 10, is mounted on the spindle 5 by the tool changer 10 after machining of the work W is completed, and starts measuring operation upon receiving a command from the control device 20. do. In this measurement operation, first, a laser beam is emitted from the laser oscillator 51a toward the surface of the workpiece W, and the laser beam reflected by the surface of the workpiece W is received by the light receiving sensor 51b. is calculated, and data relating to the calculated distance is transmitted to the measurement data processing device 52 via the wireless communication unit 51c.

The measurement data processing device 52 receives the distance data transmitted from the laser measurement head 51, and the received distance data and the X-axis, Y-axis and Z-axis directions of the main shaft 5 and the table 7 obtained from the control device 20. Based on the relative movement position data, the position of the measurement target portion is calculated, and various dimensions A to F of the work W are calculated based on the calculated position of the measurement target portion. The measurement data processing device 52 transmits information on the calculated various dimensions A to F of the workpiece W to the control device 20 . Then, the control device 20 causes the display section 9 provided on the operation panel of the machine tool 1 to display the dimension information received from the measurement data processing device 52 .

The control device 20 has a processing control section 20a, a measurement control section 20b, and a pretreatment control section 20c. The control device 20 is composed of a computer having a CPU, a ROM and a RAM, and the functions of the processing control section 20a, the measurement control section 20b, and the preprocessing control section 20c are implemented by computer programs.

Specifically, the processing control unit 20a executes control for processing the workpiece W into a desired shape by controlling the processing mechanism unit 8 including the spindle 5, the feed mechanism unit 11, etc., based on the NC program.

The measurement control unit 20b executes measurement control after the processing of the workpiece W by the processing mechanism unit 8 is completed. In this measurement control, the laser measurement head 51 is caused to perform the measurement operation while sequentially moving the laser measurement head 51 to a predetermined measurement position by the feed mechanism section 11 .

The preprocessing control unit 20c executes preprocessing control using the work cleaning device 30 and the foreign matter detection system 40 after the processing of the work W by the processing mechanism unit 8 is completed and before measurement control by the measurement control unit 20b is started.

Details of the preprocessing control executed by the preprocessing control unit 20c will be described with reference to FIG. The preprocessing control unit 20c first monitors the execution status of the NC program by the machining control unit 20a, and determines whether or not the machining of the workpiece W by the machining mechanism unit 8 is completed (step SA1). When the preprocessing control unit 20c determines that the processing of the work W by the processing mechanism unit 8 has not been completed (NO in step SA1), the preprocessing control unit 20c executes this determination process again. is completed (YES in step SA1), the work cleaning device 30 is caused to perform the cleaning operation of the work W (step SA2).

After the workpiece cleaning device 30 finishes cleaning the workpiece W, the preprocessing control unit 20c outputs an imaging command to each imaging camera 41 to cause the foreign matter detection system 40 to perform the foreign matter detection process (step SA3). ). Each imaging camera 41 receives an imaging command from the preprocessing control unit 20c, executes imaging processing of the workpiece W, and transmits the captured image data to the image processing device . In the image processing device 42, the detection processing unit 42b detects whether or not a foreign object adheres to the measurement target portion of the work W based on the image data received from each imaging camera 41. FIG. This detection result is transmitted from the image processing device 42 to the preprocessing control section 20 c of the control device 20 . Based on the detection results received from the image processing device 42, the preprocessing control unit 20c determines whether or not foreign matter adheres to at least one of the plurality of measurement target portions of the workpiece W (step SA4).

Then, when the preprocessing control unit 20c determines that no foreign matter adheres to all measurement target portions of the workpiece W as a result of this determination processing (NO in step SA4), the measurement control unit 20b starts measurement. A command is output to cause the laser measuring head 51 to perform a measuring operation under the control of the measurement control unit 20b (step SA6). After starting the measurement operation, the process returns to step SA1.

On the other hand, if the preprocessing control unit 20c determines in the determination process of step SA4 that there is a foreign substance attached to at least one measurement target site (YES in step SA4), is less than the predetermined number of times, and if it is determined to be less than the predetermined number of times (YES in step SA5), the process returns to step SA2 and causes the workpiece cleaning device 30 to perform the cleaning operation of the workpiece W again. let it run. This cleaning operation is repeatedly performed until it is determined that no foreign matter adheres to all measurement target portions of the workpiece W in step SA4. has reached a predetermined number of times (NO in step SA5), the pretreatment control unit 20c causes the display unit 9 to display information indicating that foreign matter is adhered to the work surface (hereinafter referred to as foreign matter adhesion information). (step SA7), and then returns to step SA1.

[Effects of Embodiment 1]
As described above, according to the present embodiment, when the machining of the workpiece W by the machining mechanism unit 8 is completed (YES in step SA1), the control device 20 causes the workpiece cleaning device 30 to perform a cleaning operation (corresponding to a foreign matter removing operation). ) is performed (step SA2), and the foreign matter detection system 40 is caused to perform foreign matter detection processing for the work W after the cleaning operation is finished (step SA3), and based on the processing result, the work W to be measured is determined. Determination processing is executed to determine whether or not foreign matter is adhered to the site (step SA4), and if it is determined that no foreign matter is adhered as a result of the determination processing (NO in step SA4), the laser measurement head 51 is caused to perform the measurement operation (step SA6), and if it is determined that there is a foreign object attached (YES in step SA4), the on-machine measurement by the laser measurement head 51 is not executed, and the display unit 9 By displaying foreign matter adhesion information, it is configured to notify that foreign matter has adhered to the measurement target portion of the workpiece W (step SA7).

According to this configuration, when the foreign matter detection system 40 detects that a foreign matter has adhered to the measurement target portion of the workpiece W after the completion of machining, before the measurement processing by the on-machine measurement system 50 starts, , the cleaning operation by the workpiece cleaning device 30 is executed. Therefore, it is possible to prevent the on-machine measurement by the laser measurement head 51 from being performed in a state where a foreign object adheres to the measurement target portion of the workpiece W. In addition, it is possible to prevent the laser beam emitted from the laser measuring head 51 from being erroneously measured due to the reflection of a foreign object or the like. Further, when the foreign matter adhesion information is displayed on the display unit 9, the operator can easily recognize that the foreign matter has adhered to the measurement target portion of the workpiece W by looking at this display. Then, the operator can take measures such as moving the workpiece W out of the machine and performing manual measurement.

In addition, in the present embodiment, when the control device 20 determines that there is adhesion of foreign matter to the measurement target portion of the workpiece W as a result of the judgment processing regarding the presence or absence of adhesion of foreign matter (YES in step SA4), the workpiece The control process (steps SA2 to S4) for re-executing the determination process after causing the cleaning apparatus 30 to perform the cleaning operation is repeatedly executed until the determination process determines that no foreign matter adheres. When the determination result that there is no foreign matter adhered is obtained (NO in step SA4), the laser measurement head 51 is caused to perform the measurement operation (step SA6), while the foreign matter adheres even if the control process is repeated a predetermined number of times. When the determination result that there is no foreign matter is not obtained (NO in step SA5), the display unit 9 is configured to notify foreign matter adhesion information.

According to this configuration, even if the foreign matter adhering to the measurement target portion of the workpiece W cannot be removed by one cleaning operation by the workpiece cleaning device 30, it can be easily removed by repeating the cleaning operation. Further, if these foreign substances cannot be removed even after repeating the cleaning operation a predetermined number of times, the foreign substance adhesion information is displayed on the display unit 9 without further cleaning operation being performed. Therefore, the foreign matter removing operation is not repeated endlessly exceeding a predetermined number of times.

<<Embodiment 2>>
FIG. 5 shows a second embodiment. This embodiment differs from the first embodiment in the content of the preprocessing control executed by the preprocessing control unit 20c. In the following description, the processing of steps SB1 to SB6 is the same as the processing of steps SA1 to SA6 of the first embodiment, so detailed description thereof will be omitted, and the processing contents of steps SB7 to SB9 will be mainly described. .

That is, in step SB7, which is advanced when the number of cleaning operations by the work cleaning device 30 reaches a predetermined number, it is determined whether or not foreign matter adheres to all measurement target portions of the work W. If this determination is YES, If there is, the process proceeds to step SB9, while if this determination is NO, the process proceeds to step SB8.

At step SB8, on-machine measurement is performed by the laser measurement head 51 for the dimensions A to F corresponding to the measurement target portion detected to have no foreign matter adhered.

In step SB9, a dimension image I displaying the positions of dimensions A to F measured by the on-machine measurement system 50 on an image simulating the shape of the workpiece W, and tabular data summarizing the measurement results of each dimension A to F. T (see FIG. 6) is displayed on the display section 9 of the operation panel.

As shown in FIG. 6, in the dimension image I, a front view and a side view of the work W are used to indicate to which part of the work W each dimension A to F corresponds by a signed dimension line. there is The dimension image I may be configured by displaying dimensions on a three-dimensional CAD model simulating the shape of the workpiece W, for example.

The table data T is composed of three columns aligned in the horizontal direction of the screen of the display unit 9. The first column from the left of the screen displays the dimensions A to F of the object to be measured. Measurement results of dimensions A to F actually measured by the measurement system 50 are displayed, and the third column displays the foreign matter adhesion status of the measurement target portion corresponding to each dimension A to F. In the example of FIG. 6, for the dimension E, the column for foreign matter adhesion status in the third column displays "foreign matter adhered". In this example, it can be determined that foreign matter is attached to the inner peripheral surface of the circular hole 13 of the workpiece W (see FIG. 4). In addition, the measurement result in the second column of the dimension E is displayed as "unmeasured". It can be recognized that the measurement is not performed. For the dimensions other than dimension E, the column for foreign matter adhesion status in the third column shows "none" indicating that there is no foreign matter adhered, and the measurement result column in the second column shows "none". Measured values obtained by the onboard measurement system 50 are displayed. Therefore, the operator can see these displays and recognize that the dimensions other than the dimension E have been correctly measured by the on-machine measurement system 50 .

[Effects of Embodiment 2]
As described above, in the present embodiment, the control device 20 determines whether a foreign object is attached to at least one of the plurality of measurement target portions corresponding to the dimensions A to F measured by the on-machine measurement system 50. When it is determined that at least one of the foreign matter is attached, the display unit 9 displays table data T (foreign matter is attached) showing the foreign matter adhesion state for each dimension A to F. An example of information that can specify the measurement target site) is displayed.

As a result, the operator can easily identify the measurement target site to which the foreign matter is attached by looking at the table data T. Therefore, the operator can quickly remove the foreign matter adhering to the workpiece W and smoothly perform manual measurement.

In this embodiment, when the table data T is displayed on the display unit 9, the control device 20 displays the on-machine measurement system A dimension image I showing the positions of dimensions A to F measured by 50 is also displayed.

According to this, by referring to the dimension image I in addition to the table data T, the operator can easily recognize the position of the measurement target site to which the foreign matter is attached.

Further, in the present embodiment, the control device 20 is configured to cause the on-machine measurement system 50 to perform on-machine measurement for the dimensions A to F corresponding to the measurement target portion determined to have no foreign matter attached. (Step SB8).

According to this, the on-machine measurement is performed by the on-machine measurement system 50 for the dimensions A to F corresponding to the measurement target portion where no foreign matter is adhered. Therefore, it is possible to prevent the measurement of all the dimensions A to F by the on-machine measurement system 50 from being stopped, and improve the measurement efficiency as much as possible.

<<Other embodiments>>
In each of the above embodiments, the cleaning operation by the workpiece cleaning device 30 and the foreign matter detection process by the foreign matter detection system 40 are repeated a predetermined number of times until it is determined that there is no foreign matter attached to the measurement target portion of the workpiece W. However, the cleaning operation by the workpiece cleaning device 30 and the foreign matter detection processing by the foreign matter detection system 40 may be executed only once (that is, steps SA5 and SB5 may be eliminated). .

In each of the above-described embodiments, the dimensions A to F of the workpiece W measured by the on-machine measurement system 50 are the distance between the two surfaces of the workpiece W or the diameter of the circular hole 13. However, the dimensions are limited to this. For example, it may be the coordinate position of a point on the surface of the work W, the surface roughness of the work W, the inclination or flatness of the surface of the work W, and the like.

In each of the above-described embodiments, the on-machine measurement system 50 is a measurement system that uses the principle of a laser displacement meter, but is not limited to this, for example, a system that performs measurement by image processing using a CCD camera. may be Alternatively, as the on-machine measurement system 50, for example, a contact-type measurement system using a touch probe or a scanning probe may be employed.

In each of the above-described embodiments, as an example of the foreign matter removing unit, the work cleaning device 30 that cleans and removes foreign matter by ejecting coolant onto the surface of the work W has been described. It may be a device that removes foreign matter by blowing air onto the surface of W, or a device that removes foreign matter using not only air but also magnetic force or the like. Further, for example, foreign matter may be removed by an air cut operation in which a tool attached to the main shaft 5 is moved along the surface of the work W by the feed mechanism 11 while the main shaft 5 is being rotated. In this case, the spindle 5, the feed mechanism section 11, and the control device 20 that drives and controls them function as a foreign matter removing section.

In each of the above-described embodiments, the notification unit for notifying foreign matter adhesion information is configured by the display unit 9 provided on the operation panel. Adhesion information may be notified.

In each of the above embodiments, the work W was measured by the three-axis control machine tool 1, but the machine tool that measures the work W is not limited at all, and any machine tool may be used.

In each of the above-described embodiments, the measurement data processing device 52 is configured separately from the control device 20 of the machine tool 1, but is not limited to this. may be provided in the control device 20 so that the measurement data processing device 52 and the control device 20 are integrated.

In each of the above-described embodiments, the image processing device 42 is configured separately from the control device 20 of the machine tool 1 , but the present invention is not limited to this. It may be provided in the device 20 so that the image processing device 42 and the control device 20 are configured integrally. Further, the imaging camera 41 is not limited to a fixed object, and may be configured to be transported and installed inside the machine using an automatic tool changer.

It should be noted that the above description of the embodiment is illustrative in all respects and is not restrictive. Modifications and modifications are possible for those skilled in the art. The scope of the invention is indicated by the claims rather than the above-described embodiments. Furthermore, the scope of the present invention includes modifications from the embodiments within the scope of claims and equivalents.

1 machine tool 8 processing mechanism unit 9 display unit (notification unit)
20 control device (control unit)
30 Work cleaning device (foreign matter removal unit)
40 foreign matter detection system (foreign matter detection unit)
50 Onboard measurement system (measurement section)
A to F Dimension I Dimensional image (foreign matter adhesion information, image information)
T table data (foreign matter adhesion information, image information)
W Work

Claims

A machine tool comprising a machining mechanism section for machining a workpiece and a measurement section for performing on-machine measurement of the workpiece that has been machined by the machining mechanism section,
a foreign matter detection unit capable of detecting foreign matter adhering to a measurement target portion of the workpiece after the completion of machining;
a foreign matter removing unit capable of executing a foreign matter removing operation for removing foreign matter adhering to a measurement target portion of the workpiece after the completion of machining;
a notification unit capable of reporting foreign matter adhesion information including the fact that a foreign matter is adhered to a measurement target portion of the workpiece;
A control unit that controls the operation of the measurement unit, the foreign matter removal unit, and the notification unit,
When the processing of the workpiece by the machining mechanism is completed, the control unit causes the foreign matter removing unit to perform the foreign matter removing operation, and causes the foreign matter detecting unit to perform foreign matter detection processing on the work after the foreign matter removing operation is completed. is executed, and based on the processing result, a determination process is performed to determine whether or not a foreign substance adheres to the measurement target portion of the work, and as a result of the determination process, it is determined that no foreign substance adheres. In this case, the measurement unit is caused to perform the on-machine measurement, and when it is determined that a foreign object is attached, the on-machine measurement by the measurement unit is not performed, and the notification unit is notified that the foreign object is attached. configured to inform information,
The number of measurement target sites is plural,
The foreign matter detection unit is configured to be capable of detecting foreign matter adhering to each of the plurality of measurement target portions,
The control unit executes the determination process for each of the plurality of measurement target parts, and if it is determined that a foreign object is attached to at least one measurement target part based on the result of the determination process, As the foreign matter adhesion information, in addition to the fact that the foreign matter is adhered, information that can specify the measurement target site to which the foreign matter is adhered is included, and the notification unit is made to notify the foreign matter adhesion information. configured,
The notification unit includes a display unit that displays the foreign matter adhesion information,
The foreign matter adhesion information is obtained by displaying the positions of the dimensions of the workpiece measured by the measuring unit on an image simulating the shape of the workpiece, and indicating whether or not there is adhesion of foreign matter to the measurement target portion corresponding to the displayed dimensions. A machine tool characterized by being image information shown.
A machine tool comprising a machining mechanism section for machining a workpiece and a measurement section for performing on-machine measurement of the workpiece that has been machined by the machining mechanism section,
a foreign matter detection unit capable of detecting foreign matter adhering to the measurement target portion of the workpiece after the completion of machining;
a foreign matter removing unit capable of executing a foreign matter removing operation for removing foreign matter adhering to a measurement target portion of the workpiece after the completion of machining;
a notification unit capable of reporting foreign matter adhesion information including the fact that a foreign matter is adhered to a measurement target portion of the workpiece;
A control unit that controls the operation of the measurement unit, the foreign matter removal unit, and the notification unit,
When the processing of the workpiece by the machining mechanism is completed, the control unit causes the foreign matter removing unit to perform the foreign matter removing operation, and causes the foreign matter detecting unit to perform foreign matter detection processing on the work after the foreign matter removing operation is completed. is executed, and based on the processing result, a determination process is performed to determine whether or not a foreign substance adheres to the measurement target portion of the work, and as a result of the determination process, it is determined that no foreign substance adheres. In this case, the measurement unit is caused to perform the on-machine measurement, and when it is determined that a foreign object is attached, the on-machine measurement by the measurement unit is not performed, and the notification unit is notified that the foreign object is attached. configured to inform information,
The number of measurement target sites is plural,
The foreign matter detection unit is configured to be capable of detecting foreign matter adhering to each of the plurality of measurement target portions,
The control unit executes the determination process for each of the plurality of measurement target parts, and if it is determined that a foreign object is attached to at least one measurement target part based on the result of the determination process, The foreign matter adhesion information may include, in addition to the fact that the foreign matter is adhered, information capable of specifying a measurement target site to which the foreign matter is adhered, and cause the notification unit to notify the foreign matter adhesion information. configured,
Even if it is determined that a foreign object is adhered to at least one measurement target region as a result of the determination process, the control unit may determine that there is no foreign substance adhered to the measurement target region. 2. A machine tool characterized in that it is configured to cause the measurement section to perform on-machine measurement of dimensions corresponding to the measurement target portion, and to display the measurement result on a display section.
When it is determined that a foreign substance is attached to at least one of the plurality of measurement target regions as a result of the determination process, the control unit causes the foreign substance removal unit to perform the foreign substance removal operation, and then performs the determination. The control process for re-executing the process is repeatedly executed until it is determined in the determination process that there is no foreign matter adhered to all the measurement target sites, and the determination process determines that there is no foreign matter adhered to all the measurement target sites. When the determination result is obtained, the measurement unit is caused to perform on-machine measurement. 2. The machine tool according to claim 1, wherein the notification unit is configured to notify the foreign matter adhesion information.
When it is determined that a foreign substance is attached to at least one of the plurality of measurement target regions as a result of the determination process, the control unit causes the foreign substance removal unit to perform the foreign substance removal operation, and then performs the determination. The control process for re-executing the process is repeatedly executed until it is determined in the determination process that there is no foreign matter adhered to all the measurement target sites, and the determination process determines that there is no foreign matter adhered to all the measurement target sites. When the determination result is obtained, the measurement unit is caused to perform on-machine measurement. further determines whether or not there is adhesion of foreign matter to all of the measurement target sites, and if it is determined that there is adhesion of foreign matter to all of the measurement target sites as a result of the determination, notifies the notification unit to that effect. When it is determined that there is no foreign matter adhered to a portion of the measurement target portion as a result of the determination processing, the measurement unit performs on-machine measurement of the dimensions corresponding to the measurement target portion. 3. The machine tool according to claim 2, wherein the machine tool is configured to execute the measurement and to display the measurement result on the display unit.