Wear measurement device and wear measurement method

Abstract

The present invention provides a wear measurement device and a wear measurement method capable of automatically measuring the wear of the tip of a tool with high precision. The wear measurement device comprises a light source (1), a camera (2) and a computing unit (3). A tool (4) is arranged on a workbench (5) and is adjusted so that light from the light source (1) shines on the tip of the tool (4). The positional relationship between the light source (1), the camera (2) and the tool (4) is set so that, when a replacement tool (7) is arranged instead of the tool (4), the configuration of the light source (1) and the camera (2) becomes a regular reflection relationship with respect to the wear surface (7a) of the replacement tool (7). Since the positional relationship between the light source, the camera and the replacement tool is set as described above, the positional relationship between the light source, the camera and the tool is set so that the configuration of the light source and the camera becomes a regular reflection relationship with respect to the wear surface of the tool or a relationship close to it.

Description

Technical Field

[0001] The present invention relates to a wear measurement device or a wear measurement method for measuring the wear of a tool. Background Art

[0002] As a method of measuring the wear amount of a cutting edge of a grinding tool or the like, there is known a method of taking an image of the cutting edge and analyzing the image data to calculate the wear amount.

[0003] Patent document 1 describes that a camera is placed at a position directly opposite to the tool tip, the tool tip is illuminated by a coaxial reflection method and a small ring light, the tool tip is photographed in this state, and the wear amount is measured based on the photographed image data. In addition, the measurement of the wear amount is described as being performed by binarizing or multi-valued the image data to obtain the wear width of the backing surface of the cutting edge.

[0004] Patent document 2 describes a method for extracting the contour line of the tool tip that serves as a reference for measuring the amount of wear based on an image obtained by photographing the tool tip. Specifically, the extraction is performed as follows. First, based on the image obtained by photographing the tool tip, three or more extraction lines that intersect the direction of the tool tip are extracted. Next, the line pixel data on the extraction line is differentiated to obtain the boundary candidate points between the tool tip and the background, and the combination of points that are most located on the straight line is selected from the combination of each boundary candidate point, and they are used as the guide straight line for the tool tip. Next, a differential image of the image obtained by photographing the tool tip is obtained. The differential direction is the direction of the tool tip. Next, the contour line of the tool tip is extracted by extracting pixels with larger differential values ​​in the differential image near the guide straight line and connecting the pixels.

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 8-257876

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 11-351835

[0007] However, in Patent Document 1, the worn surface appears darker than the normal surface, and it is difficult to selectively detect only the worn surface. Therefore, in the method of Patent Document 1, it is not easy to automatically measure the wear amount.

[0008] In addition, in Patent Document 2, when the wear amount is to be automatically measured, the wear surface is shown slightly darker than the normal surface in the image of the tool tip, and it is believed that the wear amount can be detected. However, the boundary between the wear surface and the normal surface is unclear, and the contour line of the tool tip portion that serves as a reference for measuring the wear amount may not be found. Therefore, it is difficult to detect the wear amount with high accuracy. Summary of the invention

[0009] Therefore, an object of the present invention is to provide a wear measurement device and a wear measurement method capable of automatically measuring the wear amount of a tool tip of a tool with high accuracy.

[0010] The present invention is a wear measurement device, comprising: a light irradiation unit, which irradiates light to a measured object having a wear surface; a photographing unit, which photographs the measured object; and a calculation unit, which determines the wear surface of the measured object based on the image obtained by the photographing unit to calculate the wear amount. The wear measurement device is characterized in that the positional relationship between the light irradiation unit, the photographing unit and the measured object is set so that when a substitute measured object having a wear surface is configured instead of the measured object, the configuration of the light irradiation unit and the photographing unit becomes a regular reflection relationship relative to the wear surface of the substitute measured object, and the calculation unit determines the wear surface based on the difference in brightness of the image to calculate the wear amount.

[0011] The wear measurement device of the present invention may further include a preset angle adjustment unit for controlling the light irradiation unit to reduce the preset angle relative to the object to be measured and the alternative object to be measured. The positional relationship between the light irradiation unit, the imaging unit, and the object to be measured can be easily set as described above.

[0012] The wear measurement device of the present invention may include a plurality of light irradiation units, and the positional relationship between the light irradiation unit, the imaging unit, and the object to be measured may be set so that when a substitute object to be measured having a wear surface is arranged instead of the object to be measured, the light irradiation unit and the imaging unit are arranged so as to be regular reflection relative to the wear surface of the substitute object to be measured, and the light from each light irradiation unit is arranged so that the incident angles of light on the wear surface of the substitute object to be measured are different from each other. Even when the wear surface is composed of a plurality of angles, the wear surface can be determined with high accuracy.

[0013] In addition, the present invention is a wear measurement method, which irradiates light onto a measured object having a wear surface, photographs the measured object, determines the wear surface of the measured object based on the image obtained by the photographing, and calculates the wear amount. The above-mentioned wear measurement method is characterized in that the relationship between the irradiation direction of light and the shooting direction is such that, when a substitute measured object having a wear surface is configured instead of the measured object, the irradiation direction of light and the shooting direction become a regular reflection relationship relative to the wear surface of the substitute measured object, and the wear surface is determined based on the difference in brightness of the image to calculate the wear amount.

[0014] In the wear measurement method of the present invention, in order to replace the wear surface of the object to be measured being photographed brightly, the irradiation direction and the shooting direction of the light can be repeatedly adjusted by gradually reducing the preset angle of the irradiated light so that the irradiation direction and the shooting direction of the light become a regular reflection relationship relative to the wear surface of the object to be measured.

[0015] In the wear measurement method of the present invention, light is irradiated to the object to be measured from multiple directions. According to each irradiation direction, the relationship between the irradiation direction of light and the shooting direction becomes such that, when a substitute object to be measured having a wear surface is arranged instead of the object to be measured, the irradiation direction of light and the shooting direction become a regular reflection relationship with respect to the wear surface of the substitute object to be measured, and the incident angles of light from each irradiation direction with respect to the wear surface of the substitute object to be measured are different from each other. Even when the wear surface is composed of multiple angles, the wear surface can be determined with high accuracy.

[0016] [Effects of the invention]

[0017] According to the present invention, the wear surface of the object to be measured can be identified with high accuracy and the wear amount can be automatically measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram showing the structure of the wear amount measuring device of Example 1.

[0019] Figure 2 2 is a diagram showing the structure of the preset angle adjustment unit 6 .

[0020] Figure 3 It is a diagram showing the arrangement relationship among the light source 1 , the camera 2 , and the substitute tool 7 .

[0021] Figure 4 This is a diagram showing an example of the tool 4 that is worn.

[0022] Figure 5 This is a photo of the cutting edge of an end mill that is experiencing wear.

[0023] Figure 6 It is a diagram showing the structure of the wear amount measuring device of Example 2.

[0024] Figure 7 This is a diagram schematically showing a state of the vicinity of a worn surface when an image of a cutting edge of a hob in which wear has occurred is captured.

[0025] Figure 8 It is a diagram showing the definition of a preset angle.

[0026] Description of reference numerals:

[0027] 1…light source; 2…camera; 3…calculation unit; 4…tool; 5…workbench; 6…preset angle adjustment unit; 7…alternative tool. DETAILED DESCRIPTION

[0028] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments.

[0029] [Example 1]

[0030] Figure 1 1 is a diagram showing the structure of the wear measurement device of the first embodiment. The wear measurement device of the first embodiment is a device for measuring the wear of the cutting edge of the tool 4. Figure 1 As shown, the wear measurement device of Example 1 includes a light source 1, a camera 2, and a computing unit 3. The light source 1 is equivalent to the light irradiation unit of the present invention, and the camera 2 is equivalent to the photographing unit of the present invention. In addition, a tool 4 as a measured object is arranged on a workbench 5, and the tool 4 is supported in a rotatable and linear manner. The position and posture (angle) of the tool 4 are adjusted by the workbench 5 so that the light from the light source 1 is irradiated on the tip of the tool 4.

[0031] Figure 4 This is an example of a state where the cutting edge of the tool 4 is worn. Figure 4 As shown in FIG. 1 , the wear surface 4a is produced due to the wear of the blade tip. Figure 4 In the figure, the dotted line represents the edge line of the blade tip before wear. The wear surface 4a has an angle different from other surfaces constituting the blade tip, such as the backing surface and the front surface. In the wear measurement device of Example 1, the range of the wear surface 4a is determined by image processing to calculate the wear amount. In addition, the wear mentioned in this specification refers to not only the wear caused by the wear of the blade tip of the tool 4 due to abrasion, but also the wear caused by rolling (notch), deformation, etc., so that the blade tip of the tool 4 becomes a state different from the original shape.

[0032] The light source 1 is a device for irradiating light to the tip of the tool 4. The wavelength of the light from the light source 1 is arbitrary, as long as it is a wavelength band that can be reflected by the tool 4 and can be photographed by the camera 2. In addition, the light from the light source 1 uses light with a light emitting surface 8 of an appropriate size. For example, a light source 1 with a preset angle of 5° or more and 15° or less is used. If the preset angle is within this range, the wear amount of the tool 4 can be measured with higher accuracy. Here, as Figure 8 As shown, the preset angle of the light source 1 relative to the tool 4 is defined as the angle between L1 and L2, with the central axis of the light emitting surface 8 of the light source 1 being L1, the intersection of L1 and the tool 4 being P, and the straight line connecting the end of the light emitting surface 8 and the point P being L2. The preset angle of the light source 1 relative to the alternative tool 7 described later is also defined in the same way.

[0033] A preset angle adjustment unit 6 is provided near the light emitting side of the light source 1. The preset angle adjustment unit 6 is a device that performs control to reduce the preset angle of the light emitted from the light source 1 relative to the tool 4 and the alternative tool 7. The preset angle adjustment unit 6 is used to adjust the positional relationship between the light source 1, the camera 2, and the tool 4 described later.

[0034] For example, Figure 2As shown, the preset angle adjusting unit 6 is a device that adjusts the preset angle by using a cylinder 11 having an opening with a diameter smaller than the light-emitting surface and by covering the protruding portion of the light source 1 with the cylinder 11. Alternatively, the preset angle adjusting unit 6 may be an aperture.

[0035] Preferably, the minimum value of the preset angle of the light source 1 can be set to 2° or less by the preset angle adjustment unit 6. This makes it easy to adjust the positional relationship among the light source 1, the camera 2, and the tool 4 described later.

[0036] The camera 2 is a device that collects reflected light from the tip of the tool 4 with a lens and then uses an imaging element such as a CCD to capture an image, thereby acquiring digital image data.

[0037] The positional relationship between the light source 1, the camera 2 and the tool 4 is set so that when the tool 4 is replaced with the substitute tool 7, the light source 1 and the camera 2 are arranged to form a regular reflection relationship with respect to the wear surface 7a of the substitute tool 7 (see Figure 3 ). That is, the light source 1 and the camera 2 are arranged so that the angle between the irradiation direction of the light from the light source 1 and the wear surface 7a and the angle between the shooting direction of the camera 2 and the wear surface 7a are equal. Here, the substitute tool 7 is a tool obtained by actually using a tool of the same type as the tool 4 to wear the tool tip, and the position, range, and angle of the wear surface 7a are known. The wear surface 7a is a surface generated by the wear of the tool tip, and is a surface having an angle different from other surfaces constituting the tool tip (e.g., the front surface, the back surface).

[0038] Furthermore, strictly speaking, the arrangement of the light source 1 and the camera 2 does not need to be in a regular reflection relationship with respect to the wear surface 7a of the substitute tool 7, and as long as they are in a range that can sufficiently accurately identify the wear surface 4a of the tool 4, some deviation from the regular reflection relationship is allowed. For example, the angle between the radiation direction of the light from the light source 1 and the wear surface 7a is set to θ1, and the angle between the light receiving direction of the camera 2 and the wear surface 7a is set to θ2, and 0.9≦(θ2 / θ1)≦1.1.

[0039] In addition, when there is an angle deviation on the wear surface 7a of the substitute tool 7, the configuration of the light source 1 and the camera 2 cannot be uniquely determined with respect to the relationship of regular reflection on the wear surface 7a of the substitute tool 7. In this case, it is sufficient that a part of the wear surface 7a is in a relationship of regular reflection. The area of ​​regular reflection can be specially set to be as wide as possible.

[0040] Since the positional relationship among the light source 1, the camera 2, and the substitute tool 7 is set as described above, the positional relationship among the light source 1, the camera 2, and the tool 4 is set so that the arrangement of the light source 1 and the camera 2 is in a regular reflection relationship or a relationship close thereto with respect to the wear surface 4a of the tool 4. For example, the positional relationship among the light source 1, the camera 2, and the tool 4 is set so that the light intensity from the wear surface 4a of the tool 4 is 90% or more of the light intensity of the wear surface 7a when the arrangement of the light source 1 and the camera 2 is set so that the wear surface 7a of the substitute tool 7 is in a regular reflection relationship with respect to the wear surface 7a.

[0041] The computing unit 3 is connected to the camera 2, and the digital image data of the tool tip of the tool 4 captured by the camera 2 is input to the computing unit 3. The computing unit 3 is a device for calculating the wear amount based on the image data. The computing unit 3 is implemented, for example, by an application installed in a computer. The wear amount is defined, for example, as the maximum value of the width of the wear surface in a direction perpendicular to the tool tip ridgeline before wear. Alternatively, the volume or mass reduced by wear can also be defined as the wear amount.

[0042] Next, a method for calculating the wear amount of the cutting edge of the tool 4 using the wear amount measuring device of the first embodiment will be described.

[0043] As a preliminary preparation for measuring the wear amount of the tool 4, a substitute tool 7 is placed on the workbench 5 instead of the tool 4, and the configuration of the light source 1 is adjusted. First, the position and posture of the camera 2 are fixed, and the position and posture of the substitute tool 7 are adjusted by the workbench 5, so that the tip of the substitute tool 7 is located in the light receiving direction of the camera 2. In order to easily infer the edge line of the tip of the tool 4 in the subsequent process, the posture of the camera 2 can be fixed in such a way that the surface (for example, the front) containing the edge line of the tip is parallel to the light receiving direction of the camera 2. Next, the light of the light source 1 is irradiated on the tip of the substitute tool 7. The preset angle of the light of the light source 1 is set to the maximum in advance. That is, it becomes a state where the preset angle does not need to be adjusted by the preset angle adjustment unit 6. Moreover, the tip of the substitute tool 7 is photographed by the camera 2. Here, the position and posture of the light source 1 are roughly determined in such a way that the wear surface 7a of the tip of the substitute tool 7 is brighter than the other surfaces constituting the tip.

[0044] Next, the preset angle of the light from the light source 1 is slightly reduced by the preset angle adjuster 6. Then, the tip of the substitute tool 7 is photographed by the camera 2. The position and posture of the light source 1 are adjusted again so that the worn surface of the tip of the substitute tool 7 is brighter than the other surfaces.

[0045] While gradually reducing the preset angle of the light of the light source 1 by the preset angle adjustment unit 6, the position and posture of the light source 1 are repeatedly adjusted, and finally the position and posture of the light source 1 are adjusted in a state where the preset angle of the light source 1 is minimized by the preset angle adjustment unit 6. Thus, it is easy to set the configuration relationship between the light source 1 and the camera 2 relative to the wear surface 7a of the substitute tool 7 so that the wear surface 7a of the substitute tool 7 becomes a regular reflection relationship.

[0046] In addition, in the first embodiment, although the position and posture of the camera 2 are fixed and only the position and posture of the light source 1 are adjusted, the position and angle of the light source 1 may be fixed and only the position and angle of the camera 2 may be adjusted. In addition, the positions and angles of both the light source 1 and the camera 2 may be adjusted.

[0047] In addition, it is not necessary to use the preset angle adjustment unit 6 to adjust the configuration relationship among the light source 1, the camera 2 and the alternative tool 7 as described above. As long as the configuration relationship between the light source 1 and the camera 2 relative to the wear surface 7a of the alternative tool 7 is a regular reflection relationship relative to the wear surface 7a of the alternative tool 7, the configuration relationship can be adjusted by any method.

[0048] Next, the substitute tool 7 is removed from the workbench 5, and the tool 4 for which the wear amount is actually measured is arranged on the workbench 5. At this time, the position and posture of the tool 4 are set to be the same as those of the substitute tool 7. In addition, the position and posture of the light source 1 and the camera 2 are not changed. Therefore, the arrangement relationship of the light source 1 and the camera 2 relative to the wear surface 4a of the tool 4 also becomes a regular reflection relationship or a relationship close to it.

[0049] The preset angle of the light source 1 is appropriately adjusted by the preset angle adjustment unit 6. Usually, there is an angle deviation in the wear surface 4a of the tool 4. There is a concern that when the preset angle of the light source 1 is the smallest, the range of the wear surface 4a is calculated to be narrower than the actual range, and the range of the wear surface 4a cannot be fully determined. In this case, the preset angle of the light source 1 is appropriately adjusted by the preset angle adjustment unit 6, so that the range of the wear surface 4a can be fully determined. It is also possible not to control the preset angle by the preset angle adjustment unit 6 to make it the maximum preset angle (the preset angle of the light source 1 itself).

[0050] Next, the camera 2 captures an image of the cutting edge of the tool 4 , and the computing unit 3 performs image processing on the image data, thereby calculating the worn surface 4 a .

[0051] Here, since the positional relationship among the light source 1, camera 2 and alternative tool 7 is set such that the configuration of the light source 1 and camera 2 is in a relationship of regular reflection relative to the wear surface 7a of the alternative tool 7, the positional relationship among the light source 1, camera 2 and tool 4 is also set such that the configuration of the light source 1 and camera 2 is in a relationship of regular reflection relative to the wear surface 4a of the tool 4 or is close to it.

[0052] Therefore, most of the light from the light source 1 is reflected by the worn surface 4a of the tool 4 and enters the camera 2, and the worn surface 4a of the tool 4 is photographed brightly. On the other hand, the light reflected by other surfaces (unworn surfaces such as the front surface and the back surface) constituting the cutting edge of the tool 4 does not enter the camera 2, and the other surfaces are photographed darkly. Therefore, the worn surface 4a of the tool 4 is photographed sufficiently brighter than the other surfaces.

[0053] Therefore, the worn surface 4 a of the tool 4 can be identified by extracting the difference in brightness in the image data through simple image processing, and the wear amount can be automatically measured.

[0054] For example, the boundary line of the worn surface 4a can be determined by extracting the boundary line with different brightness through image processing such as differentiation, thereby determining the worn surface 4a. In addition, the edge line of the blade before wear can be estimated by fitting based on a straight line, and the wear amount can be calculated as the maximum value of the width of the worn surface 4a in the direction orthogonal to the edge line of the blade. In addition, the surface state of the worn surface 4a can also be measured by measuring the brightness distribution in the worn surface 4a.

[0055] In addition, when the preset angle of the light source 1 is reduced by the preset angle adjustment unit 6, the range of the wear surface 4a may be determined to be smaller than the actual range due to the angle deviation of the wear surface 4a. Therefore, the preset angle adjustment unit 6 may be used to gradually reduce the preset angle of the light source 1 to calculate the change in the range of the wear surface 4a, and the wear surface 4a when the change in the wear surface 4a becomes constant may be determined as the actual range of the wear surface 4a of the tool 4.

[0056] As described above, according to the wear measurement device of Example 1, the worn surface 4a caused by the wear of the cutting edge of the tool 4 can be photographed to be brighter than other surfaces, and the worn surface 4a can be identified by simple image processing. Therefore, the wear of the tool 4 can be automatically measured with high accuracy and simplicity.

[0057] Next, a description will be given of the results obtained by photographing the worn portion of the tool 4 using the wear measurement device of Example 1. The tool 4 and the alternative tool 7 are end mills.

[0058] Figure 5 This is a photograph of the worn surface 4a of the tool 4 which is worn. Figure 5 (a) is a case where the wear surface 4a of the tool 4 is photographed by using the wear measurement device of Example 1 and configuring the light source 1, the camera 2, and the substitute tool 7 to be regular reflection. Figure 5 (b) is a case where the light source 1, the camera 2, and the substitute tool 7 are arranged not to be regular reflections, and the worn surface 4a of the tool 4 is photographed.

[0059] like Figure 5As shown in (a) in FIG. 1 , since the light source 1 and the camera 2 are in a positional relationship of regular reflection or near regular reflection relative to the wear surface 4a of the tool 4, the wear surface 4a is photographed to be brighter than the other surfaces constituting the tool tip. Therefore, the range of the wear surface 4a can be determined by simple image processing, thereby realizing automatic measurement of the wear amount.

[0060] On the other hand, Figure 5 In (b), since the arrangement of light source 1 and camera 2 is not regular reflection with respect to wear surface 4a of tool 4, other surfaces constituting the tool tip are photographed brighter than wear surface 4a, making it difficult to identify wear surface 4a.

[0061] [Example 2]

[0062] Figure 6 2 is a diagram showing the structure of the wear measurement device of Example 2. Figure 6 As shown, in the wear measurement device of Example 2, two light sources 1 in the wear measurement device of Example 1 are provided, and a preset angle adjustment unit 6 is provided near the light irradiation side of each of the two light sources. The other structures are the same as those of the wear measurement device of Example 1. Hereinafter, the two light sources 1 are set as light sources 1A and 1B.

[0063] The arrangement relationship among the light sources 1A, 1B, the camera 2, and the tool 4 is set so that the light sources 1A and 1B are respectively in the same relationship as that in the first embodiment. That is, the arrangement relationship among the light sources 1A, the camera 2, and the tool 4 is set so that when the tool 4 is replaced with the replacement tool 7, the arrangement of the light sources 1A and the camera 2 is in a regular reflection relationship with respect to the wear surface 7a of the replacement tool 7. In addition, the arrangement relationship among the light sources 1B, the camera 2, and the tool 4 is set so that when the tool 4 is replaced with the replacement tool 7, the arrangement of the light sources 1A and the camera 2 is in a regular reflection relationship with respect to the wear surface 7a of the replacement tool 7. Furthermore, the arrangement is such that the incident angle of the light from the light source 1A with respect to the wear surface 7a of the replacement tool 7 is different from the incident angle of the light from the light source 1B. Alternatively, the arrangement may be such that the incident surfaces are different.

[0064] According to the wear measurement device of the second embodiment, the wear surface 4a of the tool 4 can be determined by simple image processing as in the wear measurement device of the first embodiment, so that the wear amount of the tool 4 can be simply and automatically measured with high accuracy. Furthermore, since the incident angle of the light from the light source 1A with respect to the wear surface 7a of the substitute tool 7 is different from the incident angle of the light from the light source 1B, even when the wear surface 4a of the tool 4 is composed of a plurality of surfaces with different angles, the range of the wear surface 4a can be measured with high accuracy.

[0065] In addition, in the wear measurement device of Example 2, although the number of light sources 1 is two, it can also be three or more. In this case, it can be configured so that the incident angles of the light from each light source 1 with respect to the wear surface 7a of the substitute tool 7 are different from each other. However, if the number of light sources 1 is too large, it is worried that it will be difficult to photograph the wear surface 4a of the tool 4 to be brighter than other surfaces. Therefore, it is preferred that the number of light sources 1 is three or less.

[0066] Next, the results obtained by photographing the worn portion of the tool 4 using the wear measurement device of Example 2 are described. The tool 4 and the substitute tool 7 are hobs.

[0067] Figure 7 This is a diagram schematically showing a state of the vicinity of the worn surface 4a when an image of the worn surface 4a of the tool 4 is captured. Figure 7 (a) is a schematic diagram of the wear measurement device of Example 2, in which light is irradiated from the left light source 1 of the two light sources 1, and light is not irradiated from the right light source 1. Figure 7 In contrast to (a), Figure 7 (b) is a schematic diagram of a case where light is irradiated from the right light source 1 and an image is taken without irradiating light from the left light source 1 . Figure 7 (c) is a schematic diagram of a case where light is irradiated from both of the two light sources 1 and an image is taken. Figure 7 (d) is a schematic diagram showing a case where a coaxial ring illumination light is used instead of the two light sources 1 to perform an image capture.

[0068] like Figure 7 As shown in (a), when only light from the light source 1 on the left side is irradiated, the left area of ​​the wear surface 4a of the tool 4 is photographed as brighter than other surfaces, but the right area of ​​the wear surface 4a of the tool 4 is dark, and the wear surface 4a cannot be determined with high precision.

[0069] In addition, if Figure 7 As shown in (b), when only light from the light source 1 on the right is irradiated, the area on the right side of the wear surface 4a of the tool 4 is photographed as brighter than other surfaces, but the area on the left side of the wear surface 4a of the tool 4 is dark, and the wear surface 4a cannot be determined with high precision.

[0070] In addition, if Figure 7 As shown in (c) in FIG. 1 , when light is irradiated from the left and right light sources 1, the entire area of ​​the wear surface 4a is photographed brightly, and the other surfaces of the blade tip are photographed darkly. Therefore, the entire area of ​​the wear surface 4a can be determined with high precision through simple image processing, thereby realizing automatic measurement of the wear amount.

[0071] In addition, if Figure 7As shown in (d) in FIG. 1 , when the coaxial ring lighting is used, the wear surface 4a of the tool 4 is photographed darkly, and the retracting surface is photographed brightly before the retracting surface. Therefore, it is difficult to identify the wear surface 4a. This is because when the coaxial ring lighting is used as the light source, the configuration of the light source and the camera 2 does not form a regular reflection relationship with respect to the wear surface 4a of the tool 4.

[0072] In addition, in the embodiment, the object to be measured is a tool, but it can be any tool. For example, the present invention can be used to measure the wear of tools for turning, gear scraping, chamfering, drilling, etc. In addition, the present invention is not limited to measuring the wear of tools, and can measure the wear of any object that is worn. For example, the wear of a metal mold can be measured.

[0073] [Industrial Applicability]

[0074] The wear amount measuring device of the present invention can be used for predicting the wear amount of a tool, determining the time to replace a tool, observing the surface condition of the worn surface of a tool, and the like.

Claims

1. A wear measurement device, characterized in that: have: a light irradiation unit for irradiating light to the object to be measured having a worn surface; an imaging unit configured to image the object to be measured; a calculation unit for determining the worn surface of the object to be measured based on the image obtained by the imaging unit to calculate the amount of wear; as well as a preset angle adjustment unit, which controls to reduce the preset angle of the light irradiation unit relative to the object to be measured and the alternative object to be measured, wherein the preset angle of the light irradiation unit relative to the object to be measured is the angle between the central axis of the light emitting surface of the light irradiation unit and a first connecting line, wherein the first connecting line is a straight line connecting the intersection of the central axis and the object to be measured and the end of the light emitting surface, and the preset angle of the light irradiation unit relative to the alternative object to be measured is the angle between the central axis of the light emitting surface of the light irradiation unit and a second connecting line, wherein the second connecting line is a straight line connecting the intersection of the central axis and the alternative object to be measured and the end of the light emitting surface. in, The positional relationship between the light irradiation unit, the imaging unit, and the object to be measured is set so that when the alternative object to be measured having a wear surface is arranged instead of the object to be measured, the light irradiation unit and the imaging unit are arranged in a regular reflection relationship with respect to the wear surface of the alternative object to be measured, The object to be measured is photographed with the preset angle being set to the maximum. The calculation unit determines the worn surface based on the difference in brightness of the image to calculate the amount of wear.

2. The wear measurement device according to claim 1, characterized in that: The wear measurement device comprises a plurality of light irradiation units, and the positional relationship between the light irradiation unit, the imaging unit, and the object to be measured is set according to each of the light irradiation units so that when a substitute object to be measured having a wear surface is arranged instead of the object to be measured, the light irradiation unit and the imaging unit are arranged in a regular reflection relationship with respect to the wear surface of the substitute object to be measured, The light from each of the light irradiation units is arranged to have different incident angles on the worn surface of the substitute object to be measured.

3. A wear measurement method, characterized in that: The object to be measured having a worn surface is irradiated with light from a light irradiation unit, the object to be measured is photographed, the worn surface of the object to be measured is determined based on the image obtained by the photographing, and the wear amount is calculated, wherein: The preset angle of the light irradiation part relative to the object to be measured and the alternative object to be measured can be adjusted to be reduced using a preset angle adjustment part. The preset angle of the light irradiation part relative to the object to be measured is the angle between the central axis of the light-emitting surface of the light irradiation part and a first connecting line, wherein the first connecting line is a straight line connecting the intersection of the central axis and the object to be measured and the end of the light-emitting surface. The preset angle of the light irradiation part relative to the alternative object to be measured is the angle between the central axis of the light-emitting surface of the light irradiation part and a second connecting line, wherein the second connecting line is a straight line connecting the intersection of the central axis and the alternative object to be measured and the end of the light-emitting surface. The relationship between the irradiation direction of light and the shooting direction is such that, when the substitute object to be measured having a worn surface is arranged instead of the object to be measured, the irradiation direction of light and the shooting direction are in a regular reflection relationship with respect to the worn surface of the substitute object to be measured, The object to be measured is photographed with the preset angle being set to a maximum, and the worn surface is determined based on the brightness difference of the image to calculate the wear amount.

4. The wear measurement method according to claim 3, characterized in that: In order to make the wear surface of the substitute object to be measured be photographed brightly, the irradiation direction and the shooting direction of the light are repeatedly adjusted by gradually reducing the preset angle, so that the irradiation direction and the shooting direction of the light become a regular reflection relationship relative to the wear surface of the substitute object to be measured.

5. The wear measurement method according to claim 3 or 4, characterized in that: The object to be measured is irradiated with light from a plurality of directions, and according to each of the irradiation directions, the relationship between the irradiation direction of the light and the shooting direction becomes such that, when an alternative object to be measured having a worn surface is arranged instead of the object to be measured, the irradiation direction of the light and the shooting direction become a regular reflection relationship with respect to the worn surface of the alternative object to be measured, The incident angles of the light from the respective irradiation directions on the worn surface of the substitute object to be measured are different from each other.

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