TW202300866A - Device for detecting tool shape and method for detecting tool shape capable of measuring the shape of a tool whose shape is unknown and detecting abnormality in the tool shape - Google Patents

Abstract

A device for detecting the shape of a tool provided on a main shaft of a machine tool includes: a camera for photographing the shape; a specific vector acquisition part for calculating specific vectors respectively at a plurality of points on the edge of the tool photographed by the camera; a specific vector comparison part for comparing a first plurality of specific vectors acquired by the specific vector acquisition part at a first time with a second plurality of specific vectors acquired at a second time; and a tool shape determination part, based upon the result compared by the specific vector comparison part, for performing a determination on the shape change of the tool when the value of the first plurality of specific vectors and the value of the second plurality of specific vectors are different from a predetermined threshold value. The specific vector is a normal vector, a tangent vector, or a specific tilt vector tilted at a certain angle with respect to the normal vector.

Description

Device for detecting shape of tool and method for detecting shape of tool

The following description is about a device for detecting the shape of a tool and a method for detecting the shape of a tool.

In recent years, in the ultra-precision machining of workpieces, as the motion performance of devices (machine tools) has improved, the proportion of tool shape accuracy to machining accuracy has increased. In addition, the tool shape is measured using, for example, a tool shape measuring device described in Patent Document 1. FIG. [Prior Art Literature] [Patent Document] [Patent Document 1] International Publication No. 2020/090844

[Problem to be Solved by the Invention] Generally, when measuring the shape of a tool, it is necessary for the measuring device to designate in advance which shape of the tool to measure. Generally, the definable (designated) tool shape is a shape of a ball slot mill, a radius end mill, a flat slot mill, etc., and the shape of a commercially available tool. However, there are occasions when workpieces are processed with tools of special shapes whose shapes are unknown, and for tools with unknown shapes, there are occasions where it is necessary to measure the shape and further detect shape anomalies. The device and method described below aim to develop a tool shape detection device and a tool shape detection method that can measure the shape of a tool whose shape is unknown and further detect abnormalities in the shape of the tool. According to the first aspect, the device for detecting the shape of the tool provided on the main shaft of the machine tool has: a camera for photographing the above-mentioned shape; and a specific vector for calculating a plurality of points on the edge of the tool photographed by the camera that are respectively specific vectors An acquisition unit; a specific vector comparison unit, comparing: the first plurality of specific vectors acquired by the specific vector acquisition unit at the first time point, and the second plurality of specific vectors acquired at the second time point; and tool shape The judging part, based on the comparison result of the specific vector comparing part, when the value of the first plurality of specific vectors and the value of the second plurality of specific vectors are different from a predetermined threshold value, the shape of the tool is determined. In the judgment of the change, the above-mentioned specific vector is a normal vector or a tangent vector or a specific tilt vector which is only inclined at a certain angle relative to the above-mentioned normal vector. According to the second aspect, the device for detecting the shape of the tool provided on the main shaft of the machine tool has: a camera for photographing the shape of the tool; A specific vector acquisition unit that calculates a specific vector at a plurality of points; an edge shape acquisition unit that photographs the tool with the aforementioned camera after use of the tool and calculates the edge shape of the tool; the specific vector calculated by the specific vector acquisition unit; and Using the edge of the tool calculated by the edge shape acquisition unit, the tool shape change acquisition unit calculates the amount of change in the shape of the tool after use relative to the shape of the tool before use, wherein the specific vector is a normal vector or A tangent vector or a specific tilt vector that is only tilted by a certain angle with respect to the above-mentioned normal vector. According to the third aspect, the device for detecting the shape of the tool provided on the main shaft of the machine tool has: a camera for photographing the shape of the tool; and before using the tool, photograph the tool with the camera to calculate the edge shape of the tool part; after the use of the above-mentioned tool, a specific vector obtaining part for calculating a specific vector by photographing a plurality of points of the above-mentioned tool on the edge of the above-mentioned tool with the above-mentioned camera; using the specific vector calculated by the above-mentioned specific vector obtaining part; and using the above-mentioned edge The edge of the tool calculated by the shape acquisition unit is a tool shape change acquisition unit that calculates the amount of change in the shape of the tool after use relative to the shape of the tool before use, wherein the specific vector is a normal vector or a tangent vector or A specific tilt vector that tilts only by a certain angle with respect to the above normal vector. According to the fourth aspect, the method of detecting the shape of the tool provided on the main shaft of the machine tool includes: calculating a specific vector of the specific vectors at a plurality of points on the edge of the tool photographed by a camera that photographs the shape of the tool The acquisition stage; the specific vector comparison stage, comparing: the first plurality of specific vectors obtained in the above-mentioned specific vector acquisition stage, and the second plurality of specific vectors obtained in the above-mentioned specific vector acquisition stage; and the tool shape judgment stage, As a result of the comparison in the specific vector comparison stage, when the values of the first plurality of specific vectors and the values of the second plurality of specific vectors are different from the predetermined critical value, the determination of the shape change of the tool is performed, and the specific The vector is a normal vector, a tangent vector, or a specific tilt vector tilted only at a certain angle relative to the normal vector. [Invention effect] According to the described device or method, it is possible to measure the shape of a tool whose shape is unknown, and to perform tool shape detection for detecting abnormalities in the shape of the tool.

Several exemplary embodiments are described below with reference to the attached drawings. A device 1 for detecting the shape of a tool (tool shape abnormality detection device) according to an embodiment is installed and used in a machine tool 2 as shown in FIG. 1 , for example. The machine tool 2 has a workbench 16 and a gantry 10 above the machine tool 18 , the beam 8 of the gantry 10 supports the spindle head 4 through the mount 6 . A spindle 11 is supported on the spindle head 4 . Here, for the sake of convenience of description, let the horizontal predetermined direction be the X direction (X-axis direction), let the other horizontal predetermined direction perpendicular to the X direction be the Y direction (Y-axis direction), and let the relative The vertical direction perpendicular to the X direction and the Y direction is the Z direction (Z axis direction). The table 16 is movable in the X-axis direction relative to the machine tool 18 . The mount 6 is movable along the beam 8 in the Y-axis direction. The spindle head 4 is movable in the Z-axis direction relative to the mount 6 . By moving these three axes, the tool (for example, an end mill) 12 is moved three-dimensionally relative to the workpiece 14 placed on the table 16, and the workpiece 14 can be processed. At the end of the table 16 is provided a device 1 for detecting the shape of the tool. The control device 20 is connected to the machine tool 2 and the device 1 for detecting the shape of the tool, and can control the machine tool 2 and the device 1 for detecting the shape of the tool. Furthermore, the control device 20 includes a CPU and a memory which are not shown. FIG. 2 is a diagram showing the measurement of the shape of the tool 12 by the device 1 for detecting the shape of the tool. The shape of the tool 12 is measured by moving the tool 12 to the position shown in FIG. 2 using the previously shown three axes. The device 1 for detecting the shape of a tool includes: a camera 22 and an illumination device 24. As shown in FIG. Since the light from the illuminating device 24 is irradiated from the rear of the tool 12 and the image is taken, the shape of the tool 12 can be taken as a shadow. The camera 22 is equipped with a high-speed shutter, and the tool 12 can take pictures such as still images even when the tool 12 is rotating at thousands of revolutions per minute. In addition, a zoom lens may be attached to the camera 22 to control the magnification by the control device 20 . The main shaft 11 is provided with a rotation angle sensor not shown, and the control device 20 can perform control such as positioning of the rotation speed and the rotation angle. When the tool 12 rotates at a rotation rate of 10,000 rotations per minute or more, it is difficult to cope only with a high-speed shutter. At this time, the lighting device 24 is provided with a flash function. When using a strobe lamp with a short lighting time of several μsec, shape measurement can be performed even when the tool 12 is rotating. In addition, the maximum number of rotations of the tool 12 can be set to about 120,000 rotations/minute. The tool 12 is used, for example, when forming the surface of a core or a cavity of a mold by cutting. The above-mentioned cutting process is used for finishing the core or the surface of the cavity of the mold, and the core or the surface of the cavity of the mold can be made into a mirror surface by the above-mentioned cutting process. The outer diameter of the end mill 12 is, for example, about 1 mm, and the number of revolutions of the end mill 12 during cutting is about 60,000 revolutions/minute. However, with photography of the tool 12, a still image of the maximum profile of the end mill 12 is obtained. This maximum profile is the cutting edge of the end mill 12 , and the shape of the cutting edge exerts an influence on the shape of the machined surface of the tool 14 . In addition, the details of the imaging of the tool 12 are described in International Publication No. 2020/090844. The tool shape measuring device disclosed in International Publication No. 2020/090844 is used as the device 1 for detecting the shape of the tool. The device 1 for detecting the shape of a tool detects the shape of a tool (eg, a cutting tool such as a rotating end mill) 12 provided on a spindle 11 of a machine tool (eg, an ultra-precision machining machine) 2 . The device 1 is, as shown in FIG. 2 , provided with a control unit 25 and a camera (digital camera) 22 for photographing the shape of the tool 12 . The control unit 25 is, for example, a part of the control device 20 , but the control unit 25 may be provided separately from the control device 20 . The device 1 is a device for detecting the shape of a tool 12 provided on a spindle 11 of a machine tool (precision machining machine) 2 . A tool 12 provided on a main shaft 11 of the machine tool 2 rotates around a predetermined central axis C1. Then, the workpiece 14 is cut while rotating the tool 12 . Furthermore, the device 1 includes, as shown in FIG. 2 , a normal vector acquisition unit (specific vector acquisition unit) 27 , a normal vector comparison unit (specific vector comparison unit) 29 , and a tool shape determination unit 31 . The normal vector acquisition unit 27 calculates the normal vectors of a plurality of points on the edge (periphery portion corresponding to the tip of the cutting edge; the edge of the largest shape) 13 of the tool 12 photographed by the camera 22 . A plurality of points on the edge 13 of the tool 12 are indicated by reference symbols P _n-1 , P _n , P _n+1 , and P _n+2 in FIGS. 3 and 4 . Complex normal vectors are represented by reference symbols VP _n-1 , VP _n , VP _n+1 , VP _n+2 . . . in FIGS. 3 and 4 . In addition, the edge 13 of the tool 12 is calculated by the edge shape acquisition unit 33 . A plurality of points on the edge 13 of the tool 12 are arranged in sequence along the extending direction of the edge 13 , for example, at a very slight distance from each other. The above-mentioned certain extremely small distance is a distance that reveals the distance between pixels of the imaging element of the camera 22 . The above-mentioned certain very small distance can be formed slightly larger than the pixel pitch. In addition, instead of calculating the normal vector by the normal vector acquisition unit 27 , a vector (specific inclination vector) inclined by a certain angle with respect to the normal vector may be calculated. That is, it is also possible to calculate a vector intersecting at a constant angle with respect to the normal vector. For example, a tangent vector (tangent vector) perpendicular to the normal vector may be calculated. Here, the horizontal vector, the specific inclination vector, and the tangent vector are specific vectors. In addition, the normal vector acquisition unit may calculate the inclination of the tangent to each edge 13 or the inclination of the normal at a plurality of points on the edge 13 of the tool 12 . The normal vector comparison unit 29 compares: the first complex normal vectors acquired by the normal vector acquisition unit 27 at the first time point, and the second plurality of normal vectors similarly acquired at the second time point. line vector. The first plurality of normal vectors are, for example, the plurality of normal vectors at the point in time before the workpiece 14 is cut by the tool 12, and the second plurality of normal vectors are, for example, after the workpiece 14 is cut by the tool 12. Complex normal vectors at time points of . The tool shape judging unit 31 is based on the comparison result of the normal vector comparing unit 29, when the values of the first plurality of normal vectors and the values of the second plurality of normal vectors are different from a predetermined threshold value, perform Judgment of shape change of tool 12 . Here, for the acquisition of the normal vectors VP _n-1 , VP _n , VP _n+1 , VP _{n+ 2} . Example for further details. First, the line amount LA _n of two adjacent points P _n and P _n+1 on the edge 13 of the connecting tool 12 is calculated. Then, the line amount LA _n+ 1 of two adjacent points P _n+1 and P _n+2 on the edge 13 of the connecting tool 12 is calculated. Next, the intersection angle with the line quantity LA _n is α _n+1 , and the intersection angle with the line quantity LA _n is β _n+1 , and the normal vector VP _n+1 starting from the point P _n+1 is calculated. The normal vector VP _n+1 is directed toward the center side of the tool 12 (rotation center axis C1 side). Also, the intersection angle α _n+1 and the intersection angle β _n+1 are equal to each other. Other normal vectors are also calculated in the same manner as the normal vector VP _n+1 . Also, the plural normal vectors VP _n-1 , VP _n , VP _n+1 , VP _n+2 . . . are equal in absolute value (scalar) to each other. The plural normal vectors VP _n-1 , VP _n , VP _n+1 , VP _{n+2 .} . . are, for example, unit vectors. In addition, by the least square method, from a plurality of points (points _Pn, etc.), instead of the line amount _LAn, etc., a half-line can be calculated, and a normal vector _VPn , etc. can be calculated. That is, in FIG. 4 , instead of the line amount LA _n+1 , a first half-line extending obliquely upward (on the point P _n+1 side) from the point P _n+2 is calculated. This half-line is calculated from a plurality of points (for example, two points P _n+1 , P _n ) by the method of least squares. Similarly, a second half-line extending obliquely downward from P _n+2 (point P _n+3 side) is calculated. Next, the angle between the first half-line and the second half-line is α _n+2 , and the angle between the second half-line is β _n+2 , and the normal vector VP _n+ starting from point P _n+2 is calculated. ₂ . Also, the intersection angle α _n+2 and the intersection angle β _n+2 are equal to each other. Other normal vectors are similarly calculated using half-lines. Next, the comparison of the first plurality of normal vectors and the second plurality of normal vectors by the normal vector comparison unit 29 will be described in more detail with reference to FIGS. 5 and 6 . The solid line shown in FIG. 5 represents the edge 13 of the tool (tool before use) 12 related to the first plurality of normal vectors. The dotted line shown in FIG. 5 represents the edge 13a of the tool (tool after use) 12 related to the second plurality of normal vectors. In addition, in FIG. 5 , a part of the dotted line 13 a is away from the solid line 13 , and other parts of the dotted line 13 a overlap with the solid line 13 . The first complex normal vectors are represented by reference symbols VP _n , VP _n+1 , VP _n+2 , VP _n+3 , VP _n+4 ..., and the second complex normal vectors are represented by reference symbols VQ _n , VQ _n+1 , VQ _n+2 , VQ _n+3 , VQ _n+4 . . . represent. The second complex normal vectors VQ _n , VQ _n+1 , VQ _n+2 , VQ _n+3 , VQ _n+4 ... are calculated in the same way as the first normal vector, and are A line vector is likewise, for example, a unit vector. Fig. 6 shows the components of each of the first complex normal vectors VP _n , VP _n+1 , VP _n+2 , VP _n+3 , VP _n+4 ... and the second complex normal vectors VQ _n , Each of VQ _n+1 , VQ _n+2 , VQ _n+3 , VQ _n+4 . . . For example, the components of the normal vector VP _n+1 are represented by (Pa _n+1 , Pb _n+1 ), and the components of the normal vector VQ _n+1 are represented by (Qa _n+1 , Qb _n+1 ). The normal vector comparison unit 29 compares the value of Pa _n+1 /Pb _n+1 (the direction of the normal vector) and the value of Qa _n+1 /Qb _n+1 . Also, the normal vector comparison unit 29 performs the same comparison for other normal vectors. For example, the value of Pa _n /Pb _n is compared with the value of Qa _n /Qb _n , and the value of Pa _n+2 /Pb _n+2 is compared with the value of Qa _n+2 /Qb _n+2 . As a result of the above comparison, the value (Pa _n+1 /Pb _n+1 ) of the normal vector VP n _{+ 1} of the point P n+1 shown in Figure 5 and the value of the normal vector VQ _{n+1 of the point Q n+ 1} The values (Qa _n+1 /Qb _n+1 ) agree with each other. That is, the value of the normal vector VP _{n +1 of point P n+1} (Pa _n+1 /Pb _n+1 ) and the value of the normal vector VQ _n+1 of point Q _n+ 1 (Qa _n+1 /Qb _n+1 ) is smaller than a predetermined critical value. On the other hand, the value of the normal vector VP _{n +2 of the point P n+2} (Pa _n+2 /Pb _n+2 ) and the value of the normal vector VQ _n+2 of the point Q _n+ 2 (Qa _{n+ 2} /Qb _n+2 ) are different from each other. That is, the value of normal vector VP _n+2 (Pa _n+2 /Pb _n+2 ) and the value of normal vector VQ _n+2 of point Q _n+2 (Qa _n+2 /Qb _n+2 ) The difference is greater than a predetermined threshold. In the same comparison, the values of the normal vector VP _n+3 and the normal vector VQ _n+3 are different from each other, and the values of the normal vector VP _n+4 and the normal vector VQ _n+4 are different from each other. Also, the values of the normal vector VP _n+5 and the normal vector VQ _n+5 are different from each other, and the values of the normal vector VP _n+6 and the normal vector VQ _n+6 are identical to each other. Furthermore, the tool shape judging unit 31 judges the shape change of the tool 12 at the point P _n-2 (point Q _n+2 ) to point P _n+5 (point Q _n+5 ). Next, detection of the wear amount of the tool 12 will be described. As described above, the first plurality of normal vectors acquired by the normal vector acquiring unit 27 are normal vectors before the tool 12 is used. Furthermore, the device 1 includes an edge shape acquisition unit 33 and a tool shape change amount acquisition unit 35 . The edge shape acquiring unit 33 calculates the edge 13 of the tool 12 by imaging the tool 12 with the camera 22 after the tool 12 is used. Further, the normal vector acquiring unit 27 calculates the normal vector using the plurality of points on the edge 13 of the tool 12 acquired by the edge shape acquiring unit 33 and the edge 13 as described above. The tool shape change acquisition unit 35 uses the first plurality of normal vectors calculated by the normal vector acquisition unit 27 and the edge 13 of the tool 12 calculated by the edge shape acquisition unit 33 to calculate the difference with respect to the tool 12 before use. The amount of change in the shape of the tool 12 after use. Furthermore, as the amount of change in the shape of the tool 12, the amount of wear of the tool 12 and the amount of chipping of the chipped portion of the tool 12 can be revealed. Here, the calculation of the amount of change in the shape of the tool 12 by the tool shape change acquisition unit 35 will be described in more detail with reference to FIG. 7 . The algorithm of the variation of the shape of the tool 12 is disclosed by taking the point Pn ₊₂ as an example. First, the normal vector VP _n+2 of P _n+2 is calculated. Next, a straight line passing through P _n+2 whose gradient coincides with the normal vector VP _n+2 (the equation of the straight line including the normal vector VP _n+2 starting from the point P _n+2 ) is calculated. Next, the straight line and the intersection point Q _m+2 with the edge 13 a are calculated, and the length of the line amount L _n+2 connecting the point P _n+2 and the intersection point Q _m+2 is calculated. The value of the length of the line amount L _n+2 is the change amount of the shape of the tool 12 at the point P _n+2 . Similarly, the amount of change in the shape of the tool 12 is also calculated for other points such as point Pn ₊₃ . Next, the operation of the device 1 for detecting the shape of a tool will be described with reference to FIG. 8 . In the initial state, the tool 12 is rotated, as shown in FIG. 2 , and the shape of the tool 12 can be measured by the device 1 . In the above-mentioned initial state, under the control of the control device 20 (control unit 25), the tool 12 before use is photographed with the camera 22 (S1), and the normal vector of the tool 12 photographed at step S1 is calculated by the normal vector acquisition unit 27. (S3). Next, a predetermined cutting process is given to the workpiece 14 using the tool 12 (S5), and the tool 12 used in step S5 is photographed with the camera 22 (S7). Next, the edge 13 of the tool 12 photographed in step S7 is calculated by the edge shape acquiring unit 33, and the normal vector of the tool 12 of the tool 12 photographed in step S7 is calculated by the normal vector acquiring unit 27 (S9). Next, the normal vector of the tool 12 calculated in step S3 and the normal vector of the tool 12 calculated in step S9 are compared by the normal vector comparison unit 29 (S11). Next, based on the comparison result in step S11, it is judged by the tool shape judging unit 31 whether there is a shape change of the tool 12 (S13). Next, using the normal vector of the tool 12 calculated in step S3 and the edge of the tool 12 calculated in step S9, the tool shape change acquisition unit 35 calculates the change amount of the shape of the tool 12 (S15). The device 1 for detecting the shape of a tool uses the normal vector acquisition unit 27 to calculate the normal vectors of the plurality of points on the edge 13 of the tool 12, and compares the first plurality of normal vectors with the normal vector comparison unit 29. Line vector and 2nd complex number of normal vectors. And, when the values of the first plurality of normal vectors and the values of the second plurality of normal vectors are different from the predetermined critical value, the tool shape judgment unit 31 judges the shape change of the tool 12 . Thereby, the shape of the tool 12 whose shape is unknown can be measured and an abnormality in the shape of the tool 12 can be detected. In addition, by comparing the normal vectors to determine whether there is a change in the shape of the tool 12 before and after use, it is possible to accurately detect the change in the shape of the tool 12 compared to comparing the shape of the tool 12 by only photographing the tool 12 before and after use. However, the above-mentioned device 1 is a device for detecting the shape of a tool provided on the main shaft of a machine tool, and the device may also have: a camera for photographing the shape of the tool; A normal vector acquisition unit that calculates a normal vector at a plurality of points on the edge of the tool; an edge shape acquisition unit that photographs the tool with the camera and calculates the edge shape of the tool after use of the tool; the normal vector calculated by the vector acquisition unit; and the amount of change in tool shape calculated by using the edge of the tool calculated by the edge shape acquisition unit to calculate the amount of change in the shape of the tool after use relative to the shape of the tool before use Get the department to master. In this device 1 , the normal vector acquisition unit 27 calculates the normal vector from a plurality of points on the edge 13 of the tool 12 before use, and the edge shape acquisition unit 33 calculates the edge 13 a of the tool 12 after use. Then, using the normal vector calculated by the normal vector acquisition unit 27 and the edge 13a of the tool 12 calculated by the edge shape acquisition unit 33, the tool shape change acquisition unit 35 calculates the use of the shape of the tool 12 before use. The amount of change in the shape of the tool 12 after. Thereby, it is possible to accurately detect the part of the tool 12 that is chipped due to use, wear amount, wear, and the like. In addition, the above-mentioned device 1 is a device for detecting the shape of a tool provided on the main shaft of a machine tool. The device may also have: a camera for taking pictures of the shape of the tool; The edge shape acquisition unit of the edge of the tool; after the use of the tool, the tool is photographed by the camera and the normal vector acquisition unit is used to calculate the normal vector from a plurality of points on the edge of the tool; The normal vector calculated by the vector acquisition unit; the tool shape change amount acquisition for calculating the change amount of the shape of the tool after use relative to the shape of the tool before use using the edge of the tool calculated by the edge shape acquisition unit be mastered. In addition, the above described content is grasped as a method of detecting the shape of the tool. That is, the method of detecting the shape of a tool installed on the main shaft of a machine tool may include: a plurality of points on the edge of the tool photographed by a camera that photographs the shape of the tool, and the normal vectors thereof are calculated. The normal vector acquisition stage; compare the normal vectors of the first complex normal vectors obtained in the above normal vector acquisition stage and the second plural normal vectors obtained in the above normal vector acquisition stage stage; and as a result of the comparison of the above-mentioned normal vector comparison stage, when the values of the above-mentioned first plurality of normal vectors and the values of the above-mentioned second plurality of normal vectors are different from the predetermined critical value, the above-mentioned tool is carried out The tool shape judgment stage of the judgment of the shape change is mastered. In addition, it is also possible to grasp a method for detecting the shape of the tool described in Claim 5, the method comprising: using the first plurality of normal vectors obtained in the normal vector acquisition stage as normal vectors of the tool before use, After the use of the above-mentioned tool, the above-mentioned tool is photographed by the above-mentioned camera and the edge shape acquisition stage on the edge of the above-mentioned tool is calculated; the first plural normal vectors calculated by the above-mentioned normal vector acquisition stage are used, and the above-mentioned edge shape is used The edge of the tool calculated in the acquisition stage is a tool shape change amount acquisition stage in which the amount of change in the shape of the tool after use is calculated relative to the shape of the tool before use. Although several embodiments have been described, modifications and even deformations of the embodiments can be made based on the above disclosure.

1: device 2: machine tool 11: Spindle 12: Tools 13,13a: The edge of the tool 22: camera 27: Normal vector acquisition part 29: Normal vector comparison unit 31: Tool shape judgment department 33: Edge shape acquisition part 35:Tool shape variation acquisition part

[ Fig. 1 ] is a diagram showing a device for detecting the shape of a tool according to an embodiment, and a schematic configuration of a machine tool provided with the device. [ Fig. 2 ] is a diagram showing a schematic configuration of a device for detecting the shape of a tool. [ Fig. 3 ] is a diagram showing the edge and normal vector of the tool obtained by the device for detecting the shape of the tool. [ FIG. 4 ] is an enlarged view showing a part of the edge of the tool and the normal vector in FIG. 3 . [ Fig. 5 ] is a diagram showing the edge and normal vector of the tool before and after use. [ Fig. 6 ] is a diagram showing components of normal vectors shown in Fig. 5 . [ Fig. 7 ] is an enlarged view showing a part of the edge of the tool and the normal vector in Fig. 5 . [ Fig. 8 ] is a flowchart showing the operation of the device for detecting the shape of the tool.

1: device

4: Spindle head

11: Spindle

12: Tools

16: Mount

22: camera

24: Lighting device

25: Control Department

27: Normal vector acquisition part

29: Normal vector comparison unit

31: Tool shape judgment department

33: Edge shape acquisition part

35:Tool shape variation acquisition part

Claims (6)

A device for detecting the shape of a tool is used to detect the shape of a tool provided on a main shaft of a machine tool, and is characterized in that it has: a camera for taking pictures of the above-mentioned shapes; A specific vector acquisition unit calculates a specific vector for each of plural points on the edge of the tool captured by the camera; The specific vector comparison unit compares: the first plurality of specific vectors acquired by the specific vector acquisition unit at the first time point, and the second plurality of specific vectors acquired at the second time point; and The tool shape judging unit performs the tool shape determination when the values of the first plurality of specific vectors and the values of the second plurality of specific vectors are different from a predetermined critical value based on the comparison result of the specific vector comparing unit. The judgment of the shape change, The above-mentioned specific vector is a normal vector, a tangent vector, or a specific inclination vector inclined only by a certain angle with respect to the above-mentioned normal vector. The device for detecting the shape of a tool as described in claim 1, wherein the first plurality of specific vectors acquired by the specific vector acquisition unit are specific vectors before the tool is used, and have: the edge shape acquiring unit calculates the edge of the tool by photographing the tool with the camera after use of the tool, and The tool shape change amount acquisition unit calculates the above-mentioned change relative to the shape of the tool before use using the first plurality of specific vectors calculated by the specific vector acquisition unit and the edge of the tool calculated by the edge shape acquisition unit. The amount of change in the shape of the tool after use. A device for detecting the shape of a tool is used to detect the shape of a tool provided on a main shaft of a machine tool, and is characterized in that it has: a camera for taking pictures of the shape of the above tools; The specific vector obtaining unit calculates a specific vector by photographing the tool with the camera and a plurality of points on the edge of the tool before using the tool; The edge shape acquiring unit, after use of the tool, photographs the tool with the camera and calculates the edge of the tool; and The tool shape change acquisition unit calculates the shape of the tool after use relative to the shape of the tool before use using the specific vector calculated by the specific vector acquisition unit and the edge of the tool calculated by the edge shape acquisition unit. the amount of change, The above-mentioned specific vector is a normal vector, a tangent vector, or a specific inclination vector inclined only by a certain angle with respect to the above-mentioned normal vector. A device for detecting the shape of a tool is used to detect the shape of a tool provided on a main shaft of a machine tool, and is characterized in that it has: a camera for taking pictures of the shape of the above tools; The edge shape acquiring unit photographs the tool with the camera and calculates the edge of the tool before the tool is used; The specific vector acquiring unit calculates a specific vector by photographing the tool with the camera after using the tool and calculating a plurality of points on the edge of the tool; and The tool shape change acquisition unit calculates the shape of the tool after use relative to the shape of the tool before use using the specific vector calculated by the specific vector acquisition unit and the edge of the tool calculated by the edge shape acquisition unit. the amount of change, The above-mentioned specific vector is a normal vector, a tangent vector, or a specific inclination vector inclined only by a certain angle with respect to the above-mentioned normal vector. A method for detecting the shape of a tool is to detect the shape of a tool set on a main shaft of a machine tool, which is characterized by: In the stage of obtaining specific vectors, the specific vectors are calculated at a plurality of points on the edge of the tool photographed by a camera that photographs the shape of the tool; The specific vector comparison stage compares: the first plurality of specific vectors acquired in the above-mentioned specific vector acquisition step, and the second plurality of specific vectors acquired subsequently in the above-mentioned specific vector acquisition step; and In the tool shape judging step, when the values of the first plurality of specific vectors and the values of the second plurality of specific vectors are different from predetermined critical values as a result of the comparison in the specific vector comparison step, the shape change of the tool is carried out. judge, The above-mentioned specific vector is a normal vector, a tangent vector, or a specific inclination vector inclined only by a certain angle with respect to the above-mentioned normal vector. The method for detecting the shape of a tool as described in Claim 5, wherein the first plurality of specific vectors obtained in the above-mentioned specific vector acquisition stage are specific vectors before the tool is used, and have: In the edge shape acquisition stage, after the tool is used, the tool is photographed by the camera and the edge of the tool is calculated, and In the tool shape change acquisition step, the first plurality of specific vectors calculated in the specific vector acquisition step and the edge of the tool calculated in the edge shape acquisition step are used to calculate the above-mentioned difference with respect to the shape of the tool before use. The amount of change in the shape of the tool after use.

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