TWI817487B - Device for detecting the shape of a tool and method for detecting the shape of a tool - Google Patents

Abstract

A device for detecting the shape of a tool installed on a main axis of a machine tool includes: a camera that photographs the shape; a specific vector acquisition unit that calculates vectors that specify each of a plurality of points on the edge of the tool photographed by the camera; and a specific vector. The comparison part compares: the first plurality of specific vectors obtained at the first time point by the above-mentioned specific vector acquisition part and the second plurality of specific vectors obtained at the second time point; and the tool shape determination part uses the above-mentioned When the comparison result of the specific vector comparison unit is different from a predetermined critical value, the values of the first plurality of specific vectors and the values of the second plurality of specific vectors are judged to have changed the shape of the tool, and the above-mentioned The specific vector is a normal vector or a tangent vector, or a specific tilt vector tilted only at a certain angle with respect to the normal vector.

Description

Device for detecting tool shape and method for detecting tool shape

The following description relates to 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 the device (machine tool) has improved, the proportion of the shape accuracy of the tool in the machining accuracy has increased. Furthermore, the tool shape measuring device described in Patent Document 1 is used to measure the shape of the tool.

[Prior technical literature] [Patent Document]

[Patent Document 1] International Publication No. 2020/090844

Generally, when measuring the shape of a tool, it is necessary for the measuring instrument to specify in advance the shape of the tool to be measured. Generally, the shape of the tool that can be defined (specified) is the shape of a commercially available tool such as the shape of a ball nose slot mill, the shape of a radius end mill, the shape of a plane slot mill, etc.

However, there are cases where tools with unknown special shapes are used to process workpieces. Processing, and for tools with unknown shapes, there are also occasions where the shape is measured to further detect shape abnormalities.

The device and method described below are for the purpose of developing a device and a method for detecting the shape of a tool that can measure the shape of a tool of unknown shape and can further detect abnormalities in the shape of the tool.

According to the first aspect, the device for detecting the shape of a tool installed on the main axis of the machine tool includes: a camera that photographs the shape; and a specific vector that calculates a vector specified by a plurality of points on the edge of the tool photographed by the camera. The acquisition part; the specific vector comparison part, compares: the first plurality of specific vectors obtained at the first time point by the above-mentioned specific vector acquisition part, and the second plurality of specific vectors obtained at the second time point; and the tool shape The determination unit determines the shape of the tool based on the comparison result of the specific vector comparison unit 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. To determine the change, the above-mentioned specific vector is a normal vector or a tangent vector or a specific tilt vector that 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 a tool installed on the spindle of the machine tool includes: a camera that takes a picture of the shape of the tool; and before using the tool, the camera takes a picture of the tool and places a photo on an edge 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 camera after use of the tool and calculates the edge of the tool; the specific vector calculated by the specific vector acquisition unit; and The edge of the tool calculated by the edge shape acquisition unit is calculated relative to the shape of the tool before use. In the tool shape change amount acquisition unit for obtaining the change amount of the tool after use, the specific vector is a normal vector, a tangent vector, or a specific inclination vector that is tilted only at a certain angle with respect to the normal vector.

According to a third aspect, the device for detecting the shape of a tool installed on a spindle of a machine tool includes: a camera that photographs the shape of the tool; and before using the tool, the camera photographs the tool and calculates and obtains the edge shape of the tool. after the use of the above-mentioned tool, the above-mentioned camera photographs a plurality of points of the above-mentioned tool on the edge of the above-mentioned tool, and calculates a specific vector; the above-mentioned specific vector acquisition part calculates the specific vector; and uses the above-mentioned edge The edge of the tool calculated by the shape acquisition unit is a tool shape change amount acquisition unit that calculates a change amount of the shape of the tool after use with respect to the shape of the tool before use, and the specific vector is a normal vector or a tangent vector or A specific tilt vector that is tilted only by a certain angle relative to the above normal vector.

According to a fourth aspect, a method for detecting the shape of a tool installed on a main axis of a machine tool includes calculating specific vectors of the specific vectors at a plurality of points on the edge of the tool captured by a camera that captures the shape of the tool. The acquisition phase; the specific vector comparison phase, which compares: the first plurality of specific vectors acquired in the above-mentioned specific vector acquisition phase, and the second plurality of specific vectors acquired in the above-mentioned specific vector acquisition phase; and the tool shape judgment phase, When the comparison result in the above-mentioned specific vector comparison stage is that the values of the first plurality of specific vectors and the values of the above-mentioned second plurality of specific vectors are different from the predetermined critical value, the shape change of the above-mentioned tool is judged, and the above-mentioned specific vectors are determined. The vector is a normal vector or a tangent vector or relative to the above normal vector Line vectors are specific tilt vectors that are only tilted by a certain angle.

According to the described device or method, the shape of a tool with an unknown shape can be measured, and abnormal tool shape detection can be performed.

1:Device

2: Machine tools

11: Spindle

12:Tools

13,13a: Edge of tool

22:Camera

27: Normal vector acquisition part

29: Normal vector comparison part

31:Tool shape judgment part

33: Edge shape acquisition part

35: Tool shape change amount acquisition part

[Fig. 1] is a diagram showing the schematic structure of a device for detecting the shape of a tool according to an embodiment and a machine tool equipped with the device.

[Fig. 2] Fig. 2 is a diagram showing the schematic structure of a device for detecting the shape of a tool.

[Fig. 3] is a diagram showing the edge and normal vector of a tool obtained by a device for detecting the shape of a tool.

[Fig. 4] is an enlarged view showing a part of the edge of the tool and its normal vector in Fig. 3. [Fig.

[Fig. 5] is a diagram showing the edge and normal vector of the tool before and after use.

[Fig. 6] A diagram showing components of the normal vector shown in Fig. 5. [Fig.

[Fig. 7] is an enlarged view showing a part of the edge of the tool and its normal vector in Fig. 5. [Fig.

[Fig. 8] is a flowchart showing the operation of the device for detecting the shape of the tool.

Several exemplary embodiments are described below with reference to the attached figures.

A device 1 (tool shape abnormality detection device) for detecting the shape of a tool according to an embodiment is provided and used in a machine tool 2 as shown in FIG. 1 , for example.

The machine tool 2 has a workbench 16 and a portal post 10 on the upper surface of the machine tool 18. The cross beam 8 of the portal post 10 supports the spindle head 4 through the seat frame 6. The spindle head 4 supports the spindle 11 .

Here, for convenience of explanation, let a predetermined horizontal direction be the X direction (X-axis direction), let the other predetermined horizontal direction orthogonal to the X direction be a Y direction (Y-axis direction), and let the The up-and-down direction in which the X direction and the Y direction are orthogonal is the Z direction (Z-axis direction).

The worktable 16 is movable in the X-axis direction relative to the machine tool 18 . The seat frame 6 is movable along the cross beam 8 in the Y-axis direction. The spindle head 4 is movable in the Z-axis direction relative to the base frame 6 .

By moving these three axes, the tool (such as an end mill) 12 moves three-dimensionally relative to the workpiece 14 placed on the workbench 16, so that the workpiece 14 can be processed. A device 1 for detecting the shape of the tool is provided at the end of the workbench 16 . The control device 20 is connected to the machine tool 2 and the device 1 for detecting the shape of the tool, and is capable of controlling 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 (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 three axes shown previously. The device 1 for detecting the shape of a tool includes a camera 22 and an illuminating device 24. As shown in FIG. 2, the shape of the tool 12 is measured in a state between the camera 22 and the illuminating device 24. The light from the lighting device 24 is irradiated from the rear of the tool 12 to capture the image. This allows the shape of the tool 12 to be photographed as a shadow.

The camera 22 is equipped with a high-speed shutter, and the tool 12 can still capture still images even when the tool 12 rotates at thousands of rotations/minute. Furthermore, a zoom lens may be installed on the camera 22 and the control device 20 may control the magnification. The spindle 11 is equipped with a rotation angle sensor (not shown), and the control device 20 can control the rotation speed, positioning of the rotation angle, etc.

When the tool 12 rotates at a rotation speed of 10,000 rotations/minute or more, it is difficult to respond only with a high-speed shutter. At this time, the lighting device 24 is equipped with a flash function. When a flash lamp with a short emission time of several μsec is used, shape measurement can be performed even with the rotating tool 12 . Furthermore, the maximum rotation speed of the tool 12 can be set to about 120,000 rotations/minute.

The tool 12 is used, for example, when forming a surface of a core or a cavity of a mold by cutting. The above-mentioned cutting process is used for final finishing of the surface of the core or cavity of the mold. Through the above-mentioned cutting process, the surface of the core or cavity of the mold becomes a mirror surface. 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, by photographing the tool 12, a still image of the maximum shape of the end mill 12 is obtained. The maximum shape is the cutting edge of the end mill 12 , and the shape of the cutting edge affects the shape of the machining surface of the tool 14 . In addition, details about the photography of the tool 12 are shown in International Publication No. 2020/090844.

As the device 1 for detecting the shape of a tool, the tool shape measuring device shown in International Publication No. 2020/090844 is used. A device 1 for detecting the shape of a tool detects a spindle installed on a machine tool (for example, an ultra-precision machining machine) 2 The shape of the tool 11 (such as a cutting tool such as a rotating end mill) 12.

As shown in FIG. 2 , the device 1 includes 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 that detects the shape of a tool 12 installed on a spindle 11 of a machine tool (precision machining machine) 2 . The tool 12 provided on the spindle 11 of the machine tool 2 rotates around a predetermined central axis C1. Then, the tool 12 is rotated while cutting the workpiece 14 .

Furthermore, as shown in FIG. 2 , the device 1 includes 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 at a plurality of points on the edge 13 of the tool 12 (a portion corresponding to the periphery of the tip of the cutting edge; the edge of the largest outer shape) photographed by the camera 22 . A plurality of points on the edge 13 of the tool 12 are represented 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 Figures 3 and 4 . Furthermore, 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 in the extending direction of the edge 13 , for example, at a certain 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 extremely small distance can be formed to be slightly larger than the pitch of pixels.

Furthermore, instead of using the normal vector acquisition unit 27 to calculate the normal vector, a vector (specific tilt vector) tilted by a certain angle with respect to the normal vector may be calculated. That is, a vector that intersects the normal vector at a certain angle can also be calculated. For example, a vector of a tangent line orthogonal to the normal vector (tangential vector) may be calculated. Here, it is assumed that the linear vector, the specific tilt vector, and the tangent vector are specific vectors. Furthermore, the normal vector acquisition unit may calculate the inclination of the tangent line of each edge 13 at a plurality of points on the edge 13 of the tool 12 or the inclination of the normal line.

The normal vector comparison unit 29 compares the first plural normal vectors obtained at the first time point by the normal vector acquisition unit 27 and the second plurality of normal vectors obtained at the second time point similarly. line vector. The first plurality of normal vectors are, for example, a plurality of normal vectors at a time point 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 . A plurality of normal vectors at the time point.

The tool shape determination unit 31 performs the operation based on the comparison result of the normal vector comparison 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 predetermined critical values. Determination of shape change of tool 12.

Here, regarding the acquisition of the normal vectors VP _n-1 , VP _n , VP _n+1 , VP _{n +2} . ₁ as an example to further elaborate.

First, the line amount LA _n of two adjacent points P _n and P _n+1 on the edge 13 of the connection tool 12 is calculated. Furthermore, the line amount LA _n+ 1 of two adjacent points P _n+1 and P _n+2 on the edge 13 of the connection tool 12 is calculated. Next, the intersection angle with the line amount LA _n is α _n+1 and the intersection angle with the line amount 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 (the rotation center axis C1 side). Furthermore, the intersection angle α _n+1 and the intersection angle β _n+1 are equal to each other.

The other normal vectors are also calculated in the same manner as the normal vector VP _n+1 . Furthermore, 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.

Furthermore, by using the least squares method, a half-line _, a normal vector VP n, etc. can be calculated from a plurality of points (points P _n, etc.) instead of the line quantities LA _n , etc. That is, in FIG. 4 , instead of the line amount LA _n+1 , the first half straight line extending obliquely upward (to 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 and P _n ) using the least squares method. Similarly, the second half straight line extending obliquely downward (to the point P _n+3 side) from P n ₊ 2 is calculated. Next, the angle of intersection with the first half-line is α _n+2 , and the angle of intersection with the second half-line is β _n+2 , and the normal vector VP _n+ starting from point P _n+2 is calculated. ₂ . Furthermore, the intersection angle α _n+2 and the intersection angle β _n+2 are equal to each other. Other normal vectors are calculated similarly using half straight lines.

Next, the comparison between the first plurality of normal vectors and the second plurality of normal vectors by the normal vector comparison unit 29 will be described in further detail with reference to FIGS. 5 and 6 . The solid line shown in FIG. 5 represents the edge 13 of the tool (the 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 (used tool) 12 related to the second plurality of normal vectors. In addition, in Fig. 5, a part of the dotted line 13a is Away from the solid line 13 , other parts of the dotted line 13 a overlap with the solid line 13 .

The first plural normal vectors are represented by reference symbols VP _n , VP _n+1 , VP _n+2 , VP n+3 , VP n+4 ..., and the second plural normal vectors are represented by reference symbols VP n , VP n+1 , VP n+2 , VP _n+3 , VP _n+4 ... Symbols VQ _n , VQ _n+1 , VQ _n+2 , VQ _n+3 , VQ _n+4 ... represent. The second plural 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 vectors, and are calculated similarly to the first normal vectors. The normal vector of is also a unit vector.

Figure 6 shows the components of each of the first plural normal vectors VP _n , VP _n+1 , VP _n+2 , VP _n+3 , VP _n+4 ..., and the second plural normal vectors VQ _n , VQ _n+1 , VQ _n+2 , VQ _n+3 , VQ _n+4 ...each component.

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 (Qan ₊₁ , Qb _n+1 ).

The normal vector comparison unit 29 compares the value of Pan ₊₁ /Pbn ₊₁ (the direction of the normal vector) with the value of Qan ₊₁ /Qbn ₊₁ . In addition, the normal vector comparison unit 29 also performs the same comparison on other normal vectors. For example, the value of _Pan /Pb _n is compared with the value of Qan /Qb _n , and the value of Pan ₊₂ /Pb _n+2 is compared with the value _of Qan ₊₂ /Qb _n+2 .

As a result of the above comparison, the value of the normal vector VP _n+1 of the point P _n+1 (Pa _n+1 /Pb _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 ) are consistent with each other. That is, the value of the normal vector VP _{n +1 of the point P n+1} (Pa _n+1 /Pb _n+1 ) and the value of the normal vector VQ _n+1 of the point Q _n+1 (Qa _n+1 /Qb _n+1 ) is smaller than the 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 the normal vector VP _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 ) The difference is greater than the predetermined critical value.

When the same comparison is made, the value of the normal vector VP _n+3 and the value of the normal vector VQ _n+3 are different from each other, and the value of the normal vector VP _n+4 and the value of the normal vector VQ _n+4 are different from each other. Furthermore, the value of the normal vector VP _n+5 and the value of the normal vector VQ _n+5 are different from each other, and the value of the normal vector VP _n+6 and the value of the normal vector VQ _n+6 are consistent with each other.

Furthermore, the tool shape determination unit 31 determines the shape change of the tool 12 at the location from 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 acquisition unit 27 are the normal vectors of the tool 12 before use. Furthermore, the device 1 includes an edge shape acquisition unit 33 and a tool shape change amount acquisition unit 35.

The edge shape acquisition unit 33 calculates the edge 13 of the tool 12 by photographing the tool 12 with the camera 22 after the tool 12 is used. Furthermore, the normal vector acquisition unit 27 calculates a normal vector using a plurality of points on the edge 13 of the tool 12 acquired by the edge shape acquisition unit 33 and the edge 13 as described above.

The tool shape change amount 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 change relative 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 damage to the defective portion of the tool 12 can be revealed.

Here, the tool shape change amount acquisition unit 35 calculates the The amount of change in shape will be described in further detail with reference to Figure 7 .

An algorithm for explaining the change amount of the shape of the tool 12 is disclosed, taking the point P _n+2 as an example. First, the normal vector VP _n+2 of P _n+2 is calculated. Next, a straight line whose inclination coincides with the normal vector VP _{n +2 passing through P n+2} is calculated (the equation of the straight line including the normal vector VP n _{+ 2 starting from the point P n+2} ).

Next, the straight line and the intersection point Q _m+2 with the edge 13a 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 this line quantity L _n+2 is the change amount of the shape of the tool 12 at point P _n+2 . Similarly, the change amount of the shape of the tool 12 is also calculated for other points such as point P _n+3 .

Next, the operation of the device 1 for detecting the shape of the tool will be described with reference to FIG. 8 .

In the initial state, the rotating tool 12 is shown in FIG. 2 and the device 1 can measure the shape of the tool 12 .

In the above 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 in step S1 is calculated by the normal vector acquisition unit 27. (S3).

Next, the tool 12 is used to perform a predetermined cutting process on the workpiece 14 (S5), and the tool 12 used in step S5 is photographed with the camera 22 (S7).

Next, the edge shape acquisition unit 33 calculates the edge 13 of the tool 12 photographed in step S7, and the normal vector acquisition unit 27 calculates the normal vector of the tool 12 photographed in step S7 (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 Compare (S11). Next, based on the comparison result in step S11, the tool shape determination unit 31 determines whether there is a change in the shape 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 amount 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 calculates the normal vectors from a plurality of points on the edge 13 of the tool 12 by a normal vector acquisition unit 27, and compares the first plurality of normal vectors by a normal vector comparison unit 29. Line vector and the second complex normal vector. Furthermore, when the values of the first plurality of normal vectors and the values of the second plurality of normal vectors are different from predetermined critical values, the tool shape determination unit 31 determines the shape change of the tool 12 .

Thereby, the shape of the tool 12 of unknown shape can be measured and abnormalities in the shape of the tool 12 can be detected. In addition, normal vectors are compared to determine whether there is a change in the shape of the tool 12 before and after use. Therefore, the change in the shape of the tool 12 can be accurately detected compared to the case where the shape of the tool 12 is compared by simply photographing the tool 12 before and after use.

However, the above-described device 1 is a device that detects the shape of a tool installed on the spindle of a machine tool. The device may also include a camera that takes a picture of the shape of the tool. Before using the tool, the device 1 takes a picture of the tool with the camera and A normal vector acquisition unit that calculates a normal vector from a plurality of points on the edge of the tool; after use of the tool, the camera photographs the tool and calculates an edge shape acquisition unit of the edge of the tool; using the normal line The normal vector calculated by the vector acquisition unit; and the edge using the tool calculated by the edge shape acquisition unit is calculated relative to the use of The tool shape change amount acquisition unit grasps the change amount of the shape of the tool after use from the shape of the previous tool.

This device 1 uses the normal vector acquisition unit 27 to calculate the normal vector from a plurality of points on the edge 13 of the tool 12 before use, and uses the edge shape acquisition unit 33 to calculate the edge 13a of the tool 12 after use. Then, using the normal vector calculated by the normal vector acquiring unit 27 and the edge 13 a of the tool 12 calculated by the edge shape acquiring unit 33 , the tool shape change amount acquiring unit 35 calculates the use relative to the shape of the tool 12 before use. The amount of change in the shape of the tool 12 after.

Thereby, the parts of the tool 12 that are damaged due to use, the amount of wear, wear, etc. can be accurately detected.

Furthermore, the above-mentioned device 1 is a device that detects the shape of a tool installed on the spindle of a machine tool. The device may also include a camera that takes a picture of the shape of the tool. Before using the tool, the camera takes a picture of the tool and calculates the shape of the tool. an edge shape acquisition unit for the edge of the tool; a normal vector acquisition unit that photographs the tool with the camera after use of the tool and calculates a normal vector from a plurality of points on the edge of the tool; and uses the normal vector The normal vector calculated by the vector acquisition unit; the tool shape change amount acquisition that calculates the change amount of the shape of the tool after use with respect 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 description is used as a method for detecting the shape of the tool.

That is, the direction of the shape of the tool installed on the spindle of the machine tool is detected. Method, this method may also include: a normal vector acquisition stage of calculating the normal vectors of a plurality of points on the edge of the tool photographed by a camera that photographs the shape of the tool; and a comparison of the normal vector acquisition stages. The first plural normal vectors obtained, and the normal vector comparison stage followed by the normal vector obtaining stage to obtain the second plural normal vectors; and the comparison result of the normal vector comparison stage, When the values of the first plurality of normal vectors and the values of the second plurality of normal vectors are different from predetermined critical values, a tool shape determination stage is performed to determine the shape change of the tool.

Furthermore, a method for detecting the shape of the tool described in claim 5 is also available, which method includes: the first plurality of normal vectors obtained in the normal vector acquisition step are the normal vectors of the tool before use, After the use of the above-mentioned tool, the above-mentioned tool is photographed with the above-mentioned camera and the edge shape acquisition stage on the edge of the above-mentioned tool is calculated; using the first plurality of normal vectors calculated in the above-mentioned normal vector acquisition stage, and the above-mentioned edge shape The edge of the tool calculated in the acquisition step is obtained, and the tool shape change amount acquisition step is used to calculate the change amount of the shape of the tool after use with respect to the shape of the tool before use.

Although several embodiments have been described, modifications and even transformations of the embodiments can be made based on the above disclosure.

1:Device

4:Spindle head

11: Spindle

12:Tools

16:Seat frame

22:Camera

24:Lighting device

25:Control Department

27: Normal vector acquisition part

29: Normal vector comparison part

31:Tool shape judgment part

33: Edge shape acquisition part

35: Tool shape change amount acquisition part

Claims (6)

A device for detecting the shape of a tool installed on a spindle of a machine tool, characterized by having: a camera for photographing the shape; and a specific vector acquisition unit for calculating the edge of the tool photographed by the camera. vectors respectively specified by a plurality of points on the vector; the specific vector comparison unit compares: the first plurality of specific vectors obtained at the first time point by the above-mentioned specific vector acquisition unit, and the second specific vectors obtained at the second time point a plurality of specific vectors; and a tool shape determination unit that determines, as a result of comparison by the specific vector comparison unit, between the values of the first plurality of specific vectors and the values of the second plurality of specific vectors and a predetermined critical value. At the same time, when the shape change of the tool is determined, the specific vector is a normal vector, a tangent vector, or a specific inclination vector that is only inclined at a certain angle with respect to the normal vector. The device for detecting the shape of a tool according to claim 1, wherein the first plurality of specific vectors acquired by the specific vector acquisition unit are specific vectors before use of the tool, and the device includes an edge shape acquisition unit, in the tool. After use, the tool is photographed with the camera and the edge of the tool is calculated, and the tool shape change amount acquisition unit uses the first plurality of specific vectors calculated by the specific vector acquisition unit, and the edge shape acquisition unit calculates The amount of change in the shape of the tool after use relative to the shape of the tool before use is calculated based on the edge of the tool. A device for detecting the shape of a tool installed on a spindle of a machine tool, characterized by having: a camera for photographing the shape of the tool; and a specific vector acquisition unit for obtaining the shape of the tool before using the tool. The camera photographs the tool and calculates a specific vector at a plurality of points on the edge of the tool; the edge shape acquisition unit photographs the tool with the camera after use of the tool and calculates the edge of the tool; and the tool shape change A quantity acquisition unit calculates an amount of change in 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 above-mentioned specific vector is a normal vector or a tangent vector, or a specific tilt vector that is only inclined at a certain angle with respect to the above-mentioned normal vector. A device for detecting the shape of a tool installed on a spindle of a machine tool, characterized in that it has: a camera for photographing the shape of the tool; and an edge shape acquisition unit for detecting the shape of the tool before use of the tool. The camera photographs the tool and calculates the edge of the tool; the specific vector acquisition unit, after the tool is used, photographs the tool with the camera and calculates specific vectors at a plurality of points on the edge of the tool; and the tool shape change The quantity acquisition unit uses the specific vector calculated by the specific vector acquisition unit and the tool calculated by the edge shape acquisition unit. The edge of the tool is calculated as the amount of change in the shape of the tool after use relative to the shape of the tool before use. The specific vector is a normal vector or a tangent vector or a specific inclination that is only inclined at a certain angle with respect to the normal vector. vector. A method for detecting the shape of a tool, which detects the shape of a tool installed on a spindle of a machine tool, characterized by: a specific vector acquisition stage, in which a plurality of edges of the tool are photographed with a camera that photographs the shape of the tool. points to calculate the specific vectors; in the specific vector comparison stage, compare: the first plurality of specific vectors obtained in the above-mentioned specific vector acquisition stage, and the second plurality of specific vectors obtained subsequently in the above-mentioned specific vector acquisition stage; and In the tool shape judgment stage, when the comparison results in the specific vector comparison stage, the values of the first plurality of specific vectors and the values of the above-mentioned second plurality of specific vectors are different from predetermined critical values, the shape of the above-mentioned tool is changed. Judgment, the above-mentioned specific vector is a normal vector or a tangent vector or a specific tilt vector that is only inclined at a certain angle relative 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 acquired in the specific vector acquisition step are specific vectors before use of the tool, and the edge shape acquisition step includes, in the tool After the use, the above-mentioned camera is used to photograph the above-mentioned tool and the edge of the above-mentioned tool is calculated, and in the stage of obtaining the tool shape change amount, the above-mentioned specific vector is used to obtain The first plurality of specific vectors calculated in one stage and the edge of the tool calculated in the edge shape acquisition stage are used to calculate the amount of change in the shape of the tool after use relative to the shape of the tool before use.

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