JP4180469B2 - How to check the machining suitability of machine tools - Google Patents

Description

  The present invention relates to a machining suitability check method for a machine tool such as an NC machine tool.

  A machining tool that is mounted on the spindle head by executing a machining program by an NC device or the like and relatively moving the work table on which the machining material is placed and the spindle head in the machine coordinate axis direction according to a feed command obtained by executing the machining program A machine tool such as a machining center that automatically processes the workpiece is known.

  In this type of machine tool, particularly a large machine tool, in order to prevent damage to the machine tool and protect the work material, in the relative movement position process of the spindle head and the work table by a feed command, Prior to machining, it is preferable to check for each workpiece material whether the spindle head on which the tool holder is mounted and the workpiece material do not interfere (collision).

  Conventionally, this interference check is performed by placing a machining material on the work table of the machine tool, executing the machining program in the idle operation state where the machining tool at the spindle head is released, and actually moving the spindle head and the work table in the machine coordinate axis direction. In this state, the operator visually observes the relationship between the spindle head and the work material on the work table. In addition to this interference check, the operator also visually checks the variation in the machining allowance, and based on this, finds a mistake in creating the machining program, finds the necessity to change the number of cuts in the machining program, and An abnormal shape of the processed material has been found by visual inspection.

  The level of experience of the operator is all about checking the operator's visual interference, finding mistakes in creating a machining program based on visual variation in the machining allowance, finding the need to change the machining program, and finding abnormal shapes in the machining material. Dependent on intuition, there is a risk that mistakes may occur, and the work efficiency is poor, and the burden on the worker is large.

  In recent years, the creation of machining programs by CAD / CAM has improved the accuracy of data creation, so in die machining that takes time for probing, actual machining without probing is required to reduce the time. However, in any case, there is no guarantee that the spindle head and machining material will not interfere with each other. There is a risk of inviting.

  The problems we are trying to solve are the ability to automatically and accurately detect all the mistakes in creating a machining program, finding the need to change the machining program, and finding abnormalities in the shape of the machining material without visual inspection by the operator. It is a good practice to reduce the preparation time for operation including the probe out, and to ensure efficient and safe machining.

The machining suitability check method for a machine tool according to the present invention generates product shape data defining a three-dimensional shape of a processed workpiece by a CAD function of a CAD / CAM device, and processes by the CAM function of the CAD / CAM device. A method for checking the suitability of machining of a machine tool that automatically performs machining by generating a machining program including a machining frequency from the standard cutting allowance of the material and the product shape data,
3-dimensional measuring detector to measure the three-dimensional shape of more processing material to obtain the product shape data obtains the processing material's shape data, said processing material's shape data at the same XY coordinates by arithmetic processing by the arithmetic processing means and it determines whether the difference of the difference or the direction of the plane normal to the Z direction of the coordinate values of the product shape data is larger than the standard entering margin which is defined in advance, increasing the processing number when it is large It is characterized by performing an instruction to change Subeku the machining program.

In addition, the machine tool machining suitability check method according to the present invention generates product shape data that defines a three-dimensional shape of a workpiece that has been machined by the CAD function of the CAD / CAM device, and the CAM function of the CAD / CAM device. Is a method for checking the suitability of machining of a machine tool that automatically performs machining by generating a machining program including the machining frequency from the standard cutting allowance of the machining material and the product shape data,
3-dimensional measuring detector to measure the three-dimensional shape of more processing material to obtain the product shape data obtains the processing material's shape data, Z and the at the same XY coordinate position processing material's shape data and product shape data Whether or not the difference between the coordinate values of the directions or the difference between the surface normal directions is larger than the specified value is determined by calculation processing by the calculation processing means, and the Z direction between the processed material shape data and the product shape data at the same XY coordinate position If the difference in the coordinate values or the difference in the surface normal direction is larger than a preset specified value exceeding the standard cutting allowance, it is determined that the machining program is erroneously created or the shape of the machining material is abnormal. It is said.

  In the processing suitability check method for a machine tool according to the present invention, a processing material is three-dimensionally imaged in a moire manner by a CCD camera under the projection of a parallel light grating by a projector, and the processing is performed based on image data output from the CCD camera. Material shape data can be acquired.

  Further, in the machine tool machining suitability check method according to the present invention, the product shape data can be acquired from a CAD device.

  In the method for checking machining suitability of a machine tool according to the present invention, the measurement of the three-dimensional shape of the workpiece material by the three-dimensional measurement detector is performed by the holding means of the three-dimensional measurement detector and the workpiece material by the three-dimensional measurement detection. Using a three-dimensional shape measuring device different from a machine tool having a table that can be positioned and arranged at a three-dimensional shape measuring position by a tool, or the three-dimensional measurement detector instead of a processing tool at the spindle head of the machine tool And measuring the three-dimensional shape of the machining material on the coordinate axis of the machine tool by relatively moving the spindle head and the work table of the machine tool on which the machining material is installed in the coordinate axis direction of the machine tool. It may be a detailed feature.

  According to the machining suitability check method of a machine tool according to the present invention, a three-dimensional measurement detector detects a machining program creation error, finds the necessity of changing the machining program, and finds a shape abnormality of the machining material. By comparing the processed material shape data obtained by measuring the three-dimensional shape of the machine, machine shape data, and product shape data, everything is automatically and accurately performed without visual inspection by the operator. The operation preparation time including the probe out can be shortened and the machine tool can be operated efficiently and safely.

  When measuring the three-dimensional shape of the machining material by the three-dimensional measurement detector using a three-dimensional shape measuring device different from the machine tool, the machine tool is not occupied for measuring the three-dimensional shape of the machining material. The machine tool operating rate is not reduced. In addition, when processing a plurality of processed materials sequentially, the three-dimensional shape measurement of the next processed material can be performed during processing of one processed material, and the time required for the entire processing can be shortened. it can.

  On the other hand, a 3D measurement detector is attached to the spindle head of the machine tool instead of the machining tool, and the spindle head and the work table are moved relative to each other in the direction of the machine tool coordinate axis. When measuring the three-dimensional shape of the processed material in the on-machine method, a special XY stage or the like is not required for measuring the three-dimensional shape, and the positioning position of the processed material is different between the shape measurement and the processing. There is no fluctuation, and the reliability of the process suitability check is further improved.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram of an inspection apparatus used to implement a processing suitability check method according to the present invention. This inspection device has an arithmetic processing device 1 and an image processing device 3.

  The arithmetic processing apparatus 1 is configured by a microcomputer or the like, and includes an interference check unit 5, a mounted tool check unit 7, a machining program check unit 9, and a machining suitability check unit 11.

  Connected to the image processing apparatus 3 are a three-dimensional imaging device 17 for imaging a processing material by a CCD camera 13 and a projector 15 as a three-dimensional measurement detector, and a CCD camera 19 for imaging a mounted tool.

  The imaging device 17 three-dimensionally images the work material W positioned and arranged on the table 21 by the CCD camera 13 under the projection of the parallel light grating by the projector 15.

  The CCD camera 19 images a tool holder 25 and a processing tool 27 that are mounted on the spindle 23 of the machine tool. Although this imaging may be two-dimensional and is not shown in the figure, the mounting portion of the tool holder 25 and the processing tool 27 is illuminated by a backlight system by an illumination device, and the tool holder 25, the processing tool What is necessary is just to image 27 as a shadow image.

  The image processing device 3 receives the image data output from the CCD camera 13, generates processing material shape data indicating the three-dimensional shape of the processing material W in three-dimensional coordinates for each pixel of the captured image, and processing material shape data. Is output to the arithmetic processing unit 1.

  Further, the image processing device 3 generates the actual tool shape data indicating the shapes of the tool holder 25 and the processing tool 27 for each pixel of the captured image by inputting the image data output from the CCD camera 19, and the actual tool shape data. Is output to the arithmetic processing unit 1.

  The interference check unit 5 inputs the processing material shape data from the image processing device 3 and the processing program of the processing material W from the programming device 29, and 3 on the machine side including the spindle head on which the processing tool and the tool holder are mounted. Coordinate position of the workpiece material W given from the workpiece material shape data at the relative movement position of the spindle head and the work table of the machine tool according to the feed command described in the machining program. Is determined by arithmetic processing to determine whether the machine is in the machine-occupied space given by the machine shape data. If the coordinate position of the work material is in the machine-occupied space, the work material and the machine interfere with each other. Then, it determines and outputs an interference check result.

  The installed tool check unit 7 inputs the actual tool shape data from the image processing device 3 and also inputs the tool shape data defining the shape of the machining tool and the tool holder, and compares and compares the actual tool shape data with the tool shape data. To determine whether the actual tool shape data is different from the tool shape data. If they are different, it is determined that the machining tool or tool holder is incorrectly installed, and the result of the installed tool check is output. . The shape data comparison in the mounting tool check unit 7 may be any of three-dimensional shape data and two-dimensional shape data. In the case of using three-dimensional shape data, the tool shape data is aided by the above-described machine shape data in the interference check. In the case of using two-dimensional shape data, the tool shape data may be obtained by converting the machine shape data in the above-described interference check into two-dimensional shape data.

  The processing program check unit 9 inputs processing material shape data from the image processing device 3 and product shape data defining the three-dimensional shape of the processed workpiece from the CAD device 30, and the same XY coordinate position as described later. The difference in the Z direction or the surface normal direction between the processed material shape data and the product shape data is larger than the standard cutting allowance specified in advance, and the difference is determined by the comparison calculation processing. If larger, a machining program change instruction is output.

  The processing suitability check unit 11 inputs the processing material shape data from the image processing device 3 and the product shape data defining the three-dimensional shape of the processed workpiece from the CAD device 30, and the same XY coordinate position as described later. Whether the difference in the Z direction or the surface normal direction between the processed material shape data and the product shape data is greater than a specified value by comparison operation processing, and if the difference is greater than the specified value, the processing program It is determined that there is a production error or the shape of the processed material is abnormal, and a processing suitability result is output.

  FIG. 2 is a system configuration diagram in a case where the machining suitability check method according to the present invention is carried out on a machine tool by an on-machine method. The portal machining center 31 includes a bed 33, a work table 35 disposed on the bed 33 and movable in the X-axis direction, a portal fixed frame 37 that is fixedly disposed across the bed 33 in the Y-axis direction, and the portal. A cross beam 39 provided on the fixed frame 37 so as to be movable in the vertical direction (Z-axis direction), a saddle 41 provided on the cross beam 39 so as to be movable in the Y-axis direction, and moved to the saddle 41 in the Z-axis direction. A three-dimensional imaging head 45 using a CCD camera and a projector instead of the processing head at the lower end of the ram 43 at the time of three-dimensional measurement of the work material W positioned and arranged on the work table 35. Is mounted face down.

  The three-dimensional imaging head 45 receives a projector drive command from the image processing apparatus 47 and three-dimensionally images the processing material W positioned and arranged on the work table 35 in a moire manner. It outputs to the dimensional image processing apparatus 47.

  The saddle 41 is provided with a tool holder attached to the spindle of the machining head attached to the ram 43 during machining, and a mounting tool imaging CCD camera 49 for imaging the machining tool.

  The image processing device 47 inputs image data from the CCD camera of the three-dimensional imaging head 45 and the CCD camera 49 for imaging the mounted tool, and processes material shape data indicating the three-dimensional shape of the processing material W with three-dimensional coordinates. It is generated for each pixel, and processed material shape data is output to a CAD / CAM device 51 by a computer system.

Further, the image processing device 47 receives the image data from the mounting tool imaging CCD camera 49, generates actual tool shape data indicating the shape of the tool holder and processing tool mounted on the spindle for each pixel of the captured image, The actual tool shape data is output to the CAD / CAM device 51.

The CAD / CAM device 51 generates product shape data that defines a three-dimensional shape of a processed workpiece by using a CAD function, generates an NC processing program from the product shape data by using the CAM function, and converts the processing program into a portal machining center. 31 to the NC device 52. The machining program generated by this CAM function is generated from data obtained by adding the standard cutting allowance of the workpiece material W set in advance to the product shape data, and the number of cuttings (the number of machining operations) corresponding to the standard cutting allowance. ).

The CAD / CAM device 51 outputs a measurement program to the NC device 52. The NC device 52 measures the three-dimensional shape of the workpiece W by the three-dimensional imaging head 45 or images the mounted tool by the mounting tool imaging CCD camera 49. The X, Y, and Z axis commands are output to the portal machining center 31 according to the measurement / imaging program.

  Thereby, when the three-dimensional shape of the workpiece material W is measured by the three-dimensional imaging head 45, the relative position between the three-dimensional imaging head 45 and the workpiece material W is set to a predetermined position.

  The CAD / CAM device 51 inputs processing material shape data from the image processing device 47, inputs machine shape data, and executes a check program, thereby performing an interference check, a mounted tool check, a processing program check, and a processing suitability check. I do.

  Next, a specific execution procedure of the check method according to the present invention will be described with reference to the flowchart shown in FIG. FIG. 4 shows an example of a processed material shape and a product shape.

  First, machining material shape data (Xw (n), Yw (n), Zw (n)) is read (step 10), and the number of data (number of measurement data) Nwmax is obtained (step 20). A data example of the processed material shape data (Xw (n), Yw (n), Zw (n)) is shown in FIG.

  Next, a processed product, that is, product shape data (Xp (n), Yp (n), Zp (n)) defining the three-dimensional shape of the product is read (step 30), and the number of data (design data) Number) Npmax is obtained (step 40). A data example of product shape data (Xp (n), Yp (n), Zp (n)) is shown in FIG.

  Next, the difference Zw (n) −Zp (n) = ΔZ (n) between the coordinate values Zw (n) and Zp (n) in the Z-axis direction of the processed material shape data and the product shape data is set to each data (n = 1). To Nwmax), and a Z-direction difference list as shown in FIG. 6 is created (step 50).

  Further, the normal direction at each coordinate position on the workpiece surface is calculated from the workpiece material shape data (Xw (n), Yw (n), Zw (n)), and the workpiece material shape data (Xw (n), Yw (n) ), Zw (n)) and product shape data (Xp (n), Yp (n), Zp (n)) are used to calculate the difference ΔL (n) in the surface normal direction from each data (n = 1 to Nwmax). ) To create a surface normal direction difference list as shown in FIG. 7 (step 60).

  Next, as a process suitability check, it is determined for each data (n = 1 to Nwmax) whether or not the Z direction difference ΔZ (n) is larger than a preset Z direction difference prescribed value ΔZmax. It is determined for each data (n = 1 to Nwmax) whether or not the line direction difference ΔL (n) is larger than a preset surface normal direction difference prescribed value ΔLmax (step 70), and ΔZ (n) If any one of the relations> ΔZmax or ΔL (n)> ΔLmax is established, it is determined that the machining program is erroneous or the shape of the workpiece W is abnormal, an error is output, and the check routine is terminated ( Step 80).

If this machining suitability check is completed in the conforming state, then as a machining program check, the standard cutting direction preset as the cutting direction allowance is Z direction difference ΔZ (n) or surface normal direction difference ΔL (n) It is determined for each data (n = 1 to Nwmax) whether or not it is larger than the cutting allowance ΔC (step 90), and if at least one relationship of ΔZ (n) or ΔL (n)> ΔC is established. Then, a change message of the machining program for prompting an increase in the number of machining operations, that is, an increase in the number of machining operations is output (step 100).

With this monitor output, the monitor screen of the CAD / CAM device 51 becomes a machining program editing screen, and a machining program for an item that requires a change in the number of machining operations is displayed on the screen.

  As a result, the operator changes the number of machining operations. Note that the number of changes in the number of machining operations may be automatically set by internal processing by the CAD / CAM device, and the operator only needs to confirm yes or no regarding the change in the number of machining operations.

  When the above-described machining suitability check and machining program check are completed, an interference check is started. In the interference check, first, the spindle head shape data, the tool holder shape data, and the tool data, the shape data based on the tool diameter and the shaft length, are read as machine information (step 110). These data are input in advance to the CAD / CAM device 49 for each spindle head and tool, and the combination of these data defines the three-dimensional shape on the machine side including the spindle head on which the machining tool and tool holder are mounted. Machine shape data is obtained.

  Next, an NC program is read as a machining program (step 120), and an interference check is executed for each block (steps 130 to 150). In this interference check, whether the spindle head including the machining tool and the tool holder at the relative movement position of the spindle head defined by the feed command in each block of the NC program and the work table 35 collides with the workpiece W on the work table 35. The coordinate value of the occupied space on the machine side is calculated from the relative movement position data between the spindle head and the work table 35 and the machine shape data, and this coordinate value and the machining material shape data (Xw ( n), Yw (n), Zw (n)) to determine whether the coordinate position of the workpiece W is in the machine-side occupied space, and the coordinate position of the workpiece W is the machine-side occupied space. If it is, the workpiece W is determined to interfere with the machine. If there is interference, a message indicating interference is output on the monitor (step 160), and the check routine is terminated.

  If the work material W and the machine do not interfere with each other, a mounting tool check is performed (step 170). This mounted tool check is performed by comparing the actual tool shape data and the tool shape data to determine whether the actual tool shape data and the tool shape data are different. It is determined that the machining tool or tool holder is misplaced, and a message indicating that the tool is misplaced is output on the monitor (step 180).

  Next, a specific example of the interference check will be described with reference to FIGS. As shown in FIG. 8, a main shaft 59 is attached to the ram 55 of the saddle 53 by an attachment 57, and a processing tool 63 is replaceably attached to the tip of the main shaft 59 by a tool holder 61. The processing tool 63 is movable in the Y-axis direction and the Z-axis direction.

  The work table 65 can move on the bed 67 in the X-axis direction, and a workpiece W is attached to the table surface by a jig 69.

  Here, as shown in FIG. 9, the machine coordinate at the center of the work table 65 is set as the machine reference coordinate value (Xm0, Ym0, Zm0), and as shown in FIG. The surface is the main axis Z-axis reference position, the rotation center position of the main shaft 57 is the main-axis X-axis reference position, and the main-axis Y-axis reference position Ys0, and the dimensions Ls1, Ls2, Ls3, Ds1, Ds2, Ds3 of these parts are shown in FIG. As shown in FIG. 5, the dimensions Lt1, Lt2, Lt3, Dt1, Dt2, and Dt3 of each part of the tool holder 61 and the processing tool 63 are assumed. The machine reference coordinate values (Xm 0, Ym 0, Zm 0) are the attachment position origin of the workpiece W on the work table 65, and this indicates a deviation from the machine origin coordinate value.

  If the difference between the origin of the workpiece coordinate system of the workpiece W attached to the workpiece table 65 by the jig 69 and the machine reference coordinate values (Xm0, Ym0, Zm0) is (Xori, Yori, Zori), the workpiece W The coordinate values (Xwm (n), Ywm (n), Zwm (n)) in the machine coordinate system are obtained by the following equation. These coordinate values (Xwm (n), Ywm (n), Zwm (n)) are global coordinate values for the machine origin coordinate value.

Xwm (n) = Xm0 + Xw (n) -Xori
Ywm (n) = Ym0 + Xw (n) -Yori
Zwm (n) = Zm0 + Zw (n) -Zori
When the coordinate position of the spindle head portion including the machining tool 63 in the machine coordinate system is (Xtm, Ytm, Ztm) and the coordinate position based on NC data is (Xnc, Ync, Znc), the coordinate position based on NC data ( Xnc, Ync, Znc) and a coordinate position (Xtm, Ytm, Ztm) in the machine coordinate system are converted.

Xtm = Xnc
Ytm = Ync
Ztm (k) = Znc-Zm0-L (k)
However, with L (k = 1-6),
L1 = Lt1
L2 = Lt2
L3 = Lt3
L4 = -Ls1
L5 = -Ls1 + Ls2
L6 = -Ls1 + Ls3
At the coordinate position (Xtm, Ytm, Ztm), the coordinate position Pn (Xwm (n)) of the workpiece W in the machine coordinate system within the cylindrical space C (k) determined by the radius R (k) and the axial length L (k). , Ywm (n), Zwm (n)) are included by numerical calculation.

However, with R (k = 1-6),
R1 = Dt1 / 2
R2 = Dt2 / 2
R3 = Dt3 / 2
R4 = Ds1 / 2
R5 = Ds2 / 2
R6 = Ds3 / 2
C (k = 1 to 6) = radius R (k = 1 to 6), axial length L (k = 1 to 6), the cylindrical space of each part If the coordinate position Pn is not included in the cylindrical space C (k) When there is “no interference” and the coordinate position Pn is included in the cylindrical space C (k), it is “with interference”.

  Further, a mathematical expression indicating the curved surface S formed by the surface of the workpiece W is created from the coordinate position Pn (Xwm (n), Ywm (n), Zwm (n)) of the workpiece W in the machine coordinate system, and the coordinate position (Xtm , Ytm, Ztm), whether the cylindrical space C (k) determined by the radius R (k) and the axial length L (k) intersects the curved surface S is determined by numerical calculation.

  When the cylindrical space C (k) and the curved surface S do not intersect each other, “no interference” is indicated. When the cylindrical space C (k) and the curved surface S intersect each other, “interference exists”.

  In addition to the work table of the machine tool, the measurement of the three-dimensional shape of the work material is not limited to the work table of the machine tool, and the table capable of positioning and arranging the work material at the three-dimensional shape measurement position by the three-dimensional measurement detector. If necessary, the table may be performed using a three-dimensional shape measuring device different from the machine tool having an XY stage.

  In addition, the measurement of the three-dimensional shape of the processed material may be performed by a three-dimensional shape measurement device using a stylus other than the one based on the image data obtained by the three-dimensional image pickup device using a CCD camera.

  Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited thereto, and various embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

It is a system configuration figure showing an example of an inspection device used for carrying out a processing propriety check method of a machine tool by the present invention. 1 is a system configuration diagram showing an example of a system configuration when a machine tool suitability checking method according to the present invention is implemented by an on-machine method. It is a flowchart explaining the specific implementation procedure of the machining suitability check method of the machine tool by this invention. It is a perspective view which shows an example of a process raw material shape and a product shape. (A) is an explanatory view showing an example of processed material shape data, and (b) is an explanatory view showing an example of product shape data. It is explanatory drawing which shows an example of a Z direction difference list. It is explanatory drawing which shows an example of a surface normal direction difference list. It is explanatory drawing which shows the specific example of an interference check. It is explanatory drawing which shows the example of a setting of a machine reference coordinate. It is a side view which shows the shape of a spindle head part. It is a side view which shows the shape of a tool part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Arithmetic processing apparatus 3 Image processing apparatus 5 Interference check part 7 Installation tool check part 9 Processing program check part 11 Processing suitability check part 13 CCD camera 15 Projector 17 Three-dimensional imaging device 19 CCD camera 21 Table 29 Programming device 30 CAD device 31 Gate Machining center 35 work table 41 saddle 43 ram 45 3D imaging head 47 3D image processing device 49 CCD camera for mounting tool imaging 51 CAD / CAM device 52 NC device 53 saddle 55 ram 57 attachment 59 spindle 61 tool holder 63 machining tool 65 Work table 69 Jig W Work material

Claims (6)

Product shape data that defines the three-dimensional shape of the finished workpiece is generated by the CAD function of the CAD / CAM device, and the standard cutting allowance of the machining material and the product shape data are generated by the CAM function of the CAD / CAM device. A method for checking the suitability of machining of a machine tool that automatically generates a machining program including the number of machining operations,
3-dimensional measuring detector to measure the three-dimensional shape of more processing material to obtain the product shape data obtains the processing material's shape data, said processing material's shape data at the same XY coordinates by arithmetic processing by the arithmetic processing means and it determines whether the difference of the difference or the direction of the plane normal to the Z direction of the coordinate values of the product shape data is larger than the standard entering margin which is defined in advance, increasing the processing number when it is large processing propriety check method of a machine tool and performing an instruction to change Subeku the machining program. Product shape data that defines the three-dimensional shape of the finished workpiece is generated by the CAD function of the CAD / CAM device, and the standard cutting allowance of the machining material and the product shape data are generated by the CAM function of the CAD / CAM device. A method for checking the suitability of machining of a machine tool that automatically generates a machining program including the number of machining operations,
3-dimensional measuring detector to measure the three-dimensional shape of more processing material to obtain the product shape data obtains the processing material's shape data, Z and the at the same XY coordinate position processing material's shape data and product shape data Whether or not the difference between the coordinate values of the directions or the difference between the surface normal directions is larger than the specified value is determined by calculation processing by the calculation processing means, and the Z direction between the processed material shape data and the product shape data at the same XY coordinate position If the difference in the coordinate values or the difference in the surface normal direction is larger than a preset specified value exceeding the standard cutting allowance, it is determined that the machining program is erroneously created or the shape of the machining material is abnormal. This is a method for checking the suitability of machining for machine tools.   A processing material is three-dimensionally imaged in a moire manner by a CCD camera under the projection of a parallel light grating by a projector, and the processing material shape data is obtained from image data output from the CCD camera. Item 3. A method for checking machining suitability of a machine tool according to Item 1 or 2.   The machine shape suitability check method according to any one of claims 1 to 3, wherein the product shape data is acquired from a CAD device.   The measurement of the three-dimensional shape of the processed material by the three-dimensional measurement detector has a holding means for the three-dimensional measurement detector and a table that can position and arrange the processed material at a three-dimensional shape measurement position by the three-dimensional measurement detector. The method for checking the suitability of machining of a machine tool according to any one of claims 1 to 4, wherein the check is performed using a three-dimensional shape measuring device different from the machine tool.   The three-dimensional measurement detector is mounted on the spindle head of the machine tool instead of the machining tool, and the machining is performed by relatively moving the spindle head and the work table of the machine tool on which the machining material is installed in the coordinate axis direction of the machine tool. The method for checking the suitability of machining of a machine tool according to any one of claims 1 to 4, wherein the three-dimensional shape of the material is measured on the coordinate axis of the machine tool.

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