KR100899259B1 - Drill inspection apparatus, drill inspection method, and redording media recording the program - Google Patents

Abstract

[assignment]

It is difficult to judge the timing of the grinding and destruction of the drill uniformly.

[Resolution]

The imaging unit 20 captures the tip of the drill blade in the direction along the rotation axis. The measuring unit 34 measures the shape information of the leading end region of the blade in the image picked up by the imaging unit 20. The storage unit 36 stores the reference data of the shape information of the tip region of the drill blade for each stage in which the number of times of polishing in the drill life cycle is reflected. The determination unit 38 determines the shape of the tip of the drill blade from the shape information measured by the measurement unit 34. For example, by combining the shape information measured by the measuring unit 34 and the reference data for each stage stored in the storage unit 36, the drill to be inspected specifies the stage to which the drill corresponds.

drill

Description

Drill inspection apparatus, drill inspection method, and recording medium recording the program {Drill inspection apparatus, drill inspection method, and redording media recording the program}

The present invention relates to a drill inspection apparatus for inspecting a drill for punching holes in a printed board and the like, a drill inspection method, and a recording medium on which the program is recorded.

As the process of miniaturization of the semiconductor process is progressing, the precision of the holes drilled in the printed circuit boards is increasingly required. The size and shape of the hole changes when the tip of the drill's blade (called 'edge' or 'tip' or 'tip') is worn out and changes. It is necessary to inspect and grind as necessary, and to reuse or destroy it.The timing of grinding and destroying of a drill is generally judged according to the number of drilled holes.

Patent Literature 1 discloses a method of comparing the reference value with a value obtained from data of a drill blade to determine whether or not it is good.

Patent Document 1: Japanese Patent Application Laid-Open No. 1-216752

When the timing of grinding and digging of the drill is determined by the number of holes, the drill may be separated from the original grinding or breaking timing due to the difference in hardness and material of the punched substrate. In addition, in the case of artificially determining the timing of polishing and digging, an experienced inspector is required, and the work itself is complicated.

SUMMARY OF THE INVENTION The present invention has been made on the basis of such a situation, and an object thereof is to provide a drill inspection apparatus, a drill inspection method, and a recording medium on which the program can be accurately judged by a simple process.

The drill inspection device which is an aspect of the present invention is characterized by measuring the shape information of the tip area of the blade in the tip image of the drill blade imaged and the shape of the tip of the drill blade from the shape information measured by the measurement unit. A determination unit for determining is provided.

In addition, any combination of the above components and the conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as aspects of the present invention.

According to the present invention, it is possible to accurately determine the state of the drill by a simple process.

First, before describing embodiment of this invention in detail, the life cycle of a drill is demonstrated. As the number of times of use of the drill increases, each of the cutting blades (pickled, sometimes referred to as "pickled" or "cutting blade") wears out, and the width of the pickled saw in the direction along the rotation axis This narrows down. If the pickled wears to such an extent that the degree of the drilled hole is damaged, the work of extending the life of the drill is performed by grinding and sharpening the tip end portion of the blade and repeatedly using it. Since such grinding reduces cost, it is often performed plural times until the drill is destroyed. From this point of view, it is possible to classify the life cycle of the drill into a plurality of stages corresponding to the number of times of polishing. In addition, it is possible to classify the drill subjected to the same number of times in a state in which it can be used and in a state in which it cannot be used due to the progress of fine hair.

1 is a diagram for explaining a stage in a life cycle of a drill. In FIG. 1, the grinding | polishing 0 state is made into the 1st stage, the polishing 1 state is made into the 2nd stage, and the polishing 2 times is made into the 3rd stage. In the case of further polishing, the stage goes further. Hereinafter, the example of three stages is demonstrated in this specification. In addition, in this specification, each 1st half part of a 1st stage, a 2nd stage, and a 3rd stage is called a 1st half stage, and each 2nd half part is called a 2nd half stage.

Fig. 2 is a diagram showing the tip state of a drill blade having two pickles. Figure 2a is a view taken in the direction along the axis of rotation of the pickled drill in the unused state of the new (zero polishing), Figure 2b is a picture taken of the drill in the finished state of the new (zero polishing) 2C is a view showing the tip of the drill blade in the unused state after one polishing, FIG. 2D is a view of the tip of the drill blade in the finished state after one polishing. FIG. 2E is a view showing the tip of the drill blade after polishing two times, FIG. 2F is a picture of the tip of the drill blade in the finished state after two polishings, and FIG. 2G is a missing state. It is a figure which photographed the tip of the drill blade. In this case, the terminated state may be a state in which the objective accuracy is not limited to the use, and the user decides to grind subjectively. Therefore, even if the drill can withstand the objective use, it may correspond to the end of use.

3 is a view showing the configuration of the drill inspection device 100 in the embodiment of the present invention. The drill inspection apparatus 100 includes an imaging unit 20, a calculation unit 30, and a display unit 40. The calculating unit 30 includes an image processing unit 32, a measuring unit 34, a setting unit 35, a storage unit 36, and a determination unit 38. The configuration of the computing unit 30 can be represented in hardware by an arbitrary computer CPU, memory, or other LSI, and in software depicts an image processing program or a numerical analysis function block loaded in the memory. Therefore, it is understood by those skilled in the art that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof. In addition, the calculating part 30 may be implement | achieved in connection with the observation apparatus which mounts the imaging part 20, and a general purpose computer, The image processing part 32 and the measuring part 34 are included in the observation apparatus, and the setting part 35 is carried out. ), The storage unit 36 and the determination unit 38 may be included in the general-purpose computer.

The imaging unit 20 captures the tip of the blade of the drill 10 in the direction along the rotation axis. The imaging unit 20 acquires an image of the tip of the blade of the drill 10 projected by a light source not shown, including a Charge Coupled Devices (CCD) sensor or a Complementary Metal-Oxide Semiconductor (CMOS) image sensor. . In this embodiment, since a simple parameter is used as mentioned later, it is good with a low resolution image, for example, imaging a drill of Ø0.5 about 3 times optically. The imaging unit 20 converts an image including the tip of the blade of the drill 10 acquired into an electric signal, and outputs it to the image processing unit 32.

The calculating part 30 specifies a predetermined parameter with reference to the area | region where the tip end of the blade in the image image | photographed by the imaging part 20 moved (henceforth a tip area | region of a blade), and the degree of abrasion of a drill from this parameter is calculated. Or the number of times of grinding in the drill's life cycle, or both. The predetermined parameter is defined in the dimension n (n is a natural number), and includes at least one of an area, an average, and a dispersion obtained from a shape curve that follows the length, width, and line width of the leading edge of the blade. Moreover, you may include any of the area | region, average, and dispersion which were obtained from the curve of the shape which followed the length of pickling. It may also include the tangent or angle of the contour of the tip region of the blade. In addition, the information obtained from the shape of the tip of the blade may be included, and the number of perforated holes may be included. Details of these parameters will be described later.

The image processing unit 32 adjusts the density value of the image input from the imaging unit 20. Specifically, each pixel value is binarized using two predetermined allowable threshold values, and the leading edge of the blade is adjusted to [0] or [1], and the background region is adjusted to [1] or [0].

The image processing unit 32 performs alignment of the binarized image. For example, the position of the tip of the pickled central axis (hereinafter, simply referred to herein as 'tip') in the image and the tip of the pickled outer circumferential side (hereinafter referred to as 'edge') in the image are shown in FIG. The tip region of the blade is moved or rotated so as to fit a predetermined reference position.

The measuring unit 34 measures the shape information of the leading end area of the blade in the image processed by the image processing unit 32. Shape information is information obtained from the shape of the tip of a blade among the said parameters. For example, the length and width of the tip region of the blade correspond.

The setting unit 35 sets reference data of the shape information of the tip region of the drill blade in the storage unit 36. As the reference data, for example, start point information generated by sampling a plurality of shape information of a tip region of an unused drill and end point information generated by sampling a plurality of shape information of a tip region of a drill blade to be used end. Set it. The reference data is data generated by learning from a plurality of sampling images. The sampled image may be imaged formally by the system designer, or may be imaged under conditions that the user actually uses. In the latter case, at least the start point information and the end point information are imaged by photographing a large number of the shape information of the tip area of the blade of the drill that the user should end use by the imaging unit 20 of the drill inspection apparatus 100. One side may be generated.

The storage unit 36 stores the reference data of the shape information of the tip region of the drill blade set by the setting unit 35. When the start point information and the end point information are set by the setting unit 35, they are stored as the reference data.

The determination unit 38 wears the drill captured by the imaging unit 20 based on the shape information measured by the measurement unit 34 and the start point information and end point information stored in the storage unit 36. The degree is determined by calculation. For example, the determination part 38 virtually forms the coordinate space which makes the element which comprises the said shape information into a coordinate axis, and in that coordinate space, the start coordinate position of the said start point information, and the end of the said end point information. From the positional relationship between the coordinate position and the input coordinate information of the shape information measured by the measuring unit 34, the degree of wear of the drilled image is determined.

In the case where the coordinate space is a two-dimensional space defined by the length and width of the tip region of the blade, for example, the start point information and the end point information can be generated as follows. From a plurality of sampling images of the unused drill, it is possible to calculate the average value of each of the length and the width of the tip area of the blade to obtain a representative point such as the center and to use this as starting point information. Similarly, from the plurality of sampling images of the drill to be terminated, the average value of each of the length and width of the leading edge region of the blade can be calculated to obtain a center, which can be used as end point information.

In the coordinate space, the determination unit 38 draws an interpolation line between the start point coordinate position and the end point coordinate position, draws a repair line from the input coordinate position to the interpolation line, and at the intersection position. Correspondingly, it is possible to specify the degree of wear concerned. It is possible to specify the degree of wear by the rate at which the intersection is located on the interpolation line. For example, when the intersection is located at the point where the interpolation line is divided into 3: 7, it is possible to determine the degree of wear as 30%. Moreover, about division | segmentation, 100 division may be sufficient, 10 division may be sufficient, and others may be sufficient as it.

In the above, the case where the interpolation line is a straight line is assumed, but you may use the transition line which is closer to a substance. In this case, the storage unit 36 further stores a transition function indicating a transition state of the shape information of the tip region of the blade, from the unused state to the end of use. The determination unit 38 specifies the wear level from the positional relationship between the transition line derived from the transition function and the input coordinate position. The detail of this process is mentioned later.

Up to this point, the embodiment applicable to a single stage on the life cycle, that is, a single-use drill, has been described, but an embodiment on the premise that there are a plurality of stages on the life cycle will now be described.

The storage unit 36 stores the reference data, for example, the start point information and the end point information, for each of a plurality of stages in the life cycle, corresponding to the number of times of drilling. The determination unit 38 determines the wear level in the stage to which the imaged drill corresponds and the stage based on the shape information measured by the measurement unit 34.

For example, it is possible for a drill to specify the stage to which it corresponds. In this case, the storage unit 36 virtually forms a coordinate space in which the elements constituting the shape information are coordinate axes, and in the coordinate space, the starting coordinate position of the starting point information and the ending coordinate of the ending point information. Store the location per stage. The determination unit 38 determines the coordinate position closest to the distance between the starting coordinate position and the ending coordinate position stored for each stage from the input coordinate position in the coordinate space of the shape information measured by the measuring unit 34, The imaged drill determines the stage to which the coordinate position belongs to the corresponding stage.

For example, it is possible for the drill to determine the degree of wear of the corresponding stage as follows. In this case, the storage unit 36 further stores shape information of the tip region of the blade, for example, length and width, in units of stages by the use of a drill. The determination unit 38 combines the shape information measured by the measurement unit 34, for example, the length and width, with the change characteristics stored in the storage unit 36, so that the drill corresponds. Find the degree of wear on the stage. As the change characteristic, it is possible to use the interpolation straight line or the transition line.

Here, the change characteristic may be generated based on the actual life cycle. For example, in a use mode in which holes are continuously drilled in the same object under the same environment, a large number of characteristics of change in the shape information with respect to the increase direction of the number of holes drilled may be sampled, and the average characteristic may be used.

Although the embodiment of specifying the wear degree of the imaged drill has been described so far, the embodiment of specifying only the corresponding stage without specifying the degree of wear is also effective as the embodiment of the present invention. This will be described below.

The determination unit 38 specifies, from the shape information measured by the measurement unit 34, a stage on the life cycle in which the drill reflects the polishing frequency corresponding to the drill. This stage may be a stage corresponding to the polishing frequency, or may be a first half stage or a second half stage in which the half is divided.

It is possible to use the length and width of the tip area of the blade as the shape information. In this case, the storage unit 36 stores the reference data of the length and width of the tip area of the drill blade for each stage in which the number of grinding operations is reflected in the drill life cycle. The start point information and the end point information can be used for this reference data. The determination unit 38 combines the length and width of the tip area of the blade measured by the measurement unit 34 with the reference data for each stage stored in the storage unit 36, thereby inspecting the inspection object. Drill specifies the corresponding stage. In the above-described embodiment, the stage corresponding to the polishing frequency is specified, but it is possible to specify here whether it is located in the first half stage or the second half stage of the stage. For example, when the length and width of the measured front end region are closest to the starting point information of the Nth (N is a natural number) stage, it is possible to determine the first half stage of the Nth stage.

In addition, it is also possible to specify whether it is located in the first half stage or the second half stage of the Nth stage by the following method. That is, in the two-dimensional space, the shape information of the tip region of the blade obtained from the unused drill of each polishing number and the sampling image of the drill to be terminated is plotted. Based on the result, a predetermined linear identifier or nonlinear identifier, such as a neural network or a support vector machine, is constructed. Thereby, it is possible to divide the two-dimensional space into the first stage to the Mth stage (M = maximum number of polishings + 1) which are divided into first and second stages, respectively. In this case, data for specifying each area, such as a boundary line of each area, becomes the reference data. In addition, a defect stage may be included when area | region division of the said two-dimensional space. It is possible to specify the missing stage based on the shape information of the tip area of the blade obtained from the image of the missing drill. Moreover, the outer edge of each stage of 1st stage-Mth stage may be specified, and the area | region between them may be used as a missing stage. For example, you may provide a missing stage in the area | region between a 1st stage and a 2nd stage, or the area | region between a 2nd stage and a 3rd stage. As described later, the space defined by three or more parameters is also oriental.

In addition to the length and width of the tip region of the blade as the shape information, it is also possible to add the area determined by a predetermined method. In this case, the storage unit 36 further stores, as a part of the reference data, the area obtained by integrating the width of the pickles included in the tip region of the blade in the longitudinal direction from the edge of the pickles only as a part of the reference data. do. The measuring part 34 measures the width | variety of pickling contained in the pickling area | region of the drill of an inspection object at least for the said predetermined length in the longitudinal direction. The determination unit 38 calculates the area by integrating the width of the pickles measured by the measuring unit 34, and stores the length, width and the area measured by the measuring unit 34 in the storage unit 36. Synthesized reference data.

In addition to the length and width of the tip region of the blade as the shape information, it is possible to add a shape curve obtained by a predetermined method. In this case, the storage unit 36 further stores, as a part of the reference data, a shape curve obtained by longitudinally extending the width of the pickles included in the tip region of the blade, in units of stages. The measurement part 34 measures the shape curve which lengthened the width | variety of the pickle contained in the front end area | region of the drill blade which is a test object in the longitudinal direction. The determination unit 38 combines the length, width, and the curve shape measured by the measurement unit 34 with the reference data stored in the storage unit 36. Moreover, you may use the length, width, said area, and the said shape curve of the tip area | region of a blade as said shape information. Details of these processes will be described later.

The display unit 40 displays the degree of wear specified by the determination unit 38. Alternatively, the inspection target drill specified by the determination unit 38 displays the stage on the corresponding life cycle. For example, if it is located in the Nth stage, it may be displayed, and if it is located in the first half or the second half of the Nth stage, it may be displayed. Alternatively, the display unit 40 displays the stage on the lifecycle to which the drill to be inspected specified by the determination unit 38 corresponds, and the degree of wear in the stage. The wear degree is 0-50% in the first stage and 51-100% in the latter stage, and becomes 0-100% in the whole stage.

In addition, the display unit 40 may inform the inspector of the state of the tip of the blade and display a message for prompting polishing or destruction. Moreover, you may display the image of the front end area | region of the day imaged by the imaging part 20. FIG. Alternatively, when the tip of a plurality of blades is collected and inspected in a cartridge, the state of each drill may be displayed in a tabular form or the like.

4 is a diagram for explaining a parameter specified from an image including the tip region of the blade. In Fig. 4, the length L of the tip region of the blade composed of the tip of the two blades is defined as the length between the longitudinal coordinate values of the sharpest position on the edge side of each of the tip of the two blades. Approximately the diameter of the drill blade. The width W of the tip area | region of a blade is prescribed | regulated by the length between the coordinate values of the width direction of the outermost convex position in the tip of two blades. In Fig. 4, two coordinate axes are defined by the number of pixels. This number of pixels can be converted to the actual length by referring to the enlargement ratio or reduction ratio in the imaging magnification and image processing.

In addition to the length L and the width W of the tip region of the blade, the measuring unit 34 may measure the width X1 to Xm (m is a natural number) of each tip in the longitudinal direction in rows in the longitudinal direction. In addition, you may measure the length Y1-Yp (p is a natural number) of each edge | tip at every row in a short direction. By continuing the width X1 to Xm for each row of the tip of each blade, it is possible to obtain a shape curve relating to the width X1 to Xm described later.

FIG. 5 is a diagram plotting sampling data in a two-dimensional parameter space defined by shape information of the tip of a blade. This two-dimensional parameter space has a width on the vertical axis and a length on the horizontal axis. As the sampling data, (1) the length data and the width data of the tip area of the drill blade in the unused state of new (0 polishing), and (2) the drill blade in the finished state of new (0 polishing) (3) Length data and width data of the leading edge of the drill in unused state after one grinding, (4) Length data and width data of the leading edge of the drill in the unused state after one grinding; Length data and width data of the tip area, (5) Length data and width data of the tip area of the drill blade in unused state after two grinding operations, and (6) Tip of the drill blade in the finished state after two grinding operations. A total of seven types of sampling data of the length data and width data of the area and the length data and width data of the tip area of the drill blade in the missing state are plotted in plural.

Here, except for the length data and the width data of the tip of the blade in the missing state, the two-dimensional parameter space can be classified into six regions by applying the linear identifier or the nonlinear apparatus to six kinds of sampling data. Each of these areas can be set as the first half stage or the second half stage of each Nth stage.

5, the first region R1 is the first half stage of the first stage, the second region R2 is the second half stage of the first stage, the third region R3 is the first half stage of the second stage, and the fourth region R4 is the second half of the second stage. It is possible to set the stage, the fifth region R5 as the first stage of the third stage, and the sixth region R6 as the latter stage of the third stage. Thereby, if the length and width of the front end region of the blade of the inspection target drill can be known, it is possible to uniquely identify whether the first and second stages of the Nth stage correspond to the first stage and the second stage. Naturally, it is possible to uniquely specify the polishing frequency. In addition, a representative point such as a center may be obtained for each sampling data of the states (1) to (6). In this case, the closest representative point can be obtained from the input data without performing the above-described area division, and thus it is possible to uniquely specify the stage and the number of times of polishing.

6 is a view for explaining a first processing example for specifying the degree of wear of a drill based on the start point information and the end point information. In the coordinate space where the length and width of the leading edge region of the blade are the X axis and the Y axis, respectively, the starting point P1 and the ending point P2 are plotted. The starting point P1 samples a plurality of coordinate points defined by the length and width of the tip region of the unused drill blade and corresponds to their centers. In the orient, the end point P2 samples a plurality of coordinate points defined by the length and width of the tip region of the drill blade to be terminated, and corresponds to their centers.

In the coordinate space, an unused area C1 centered on the start point P1 and an unused end area C2 centered on the end point P2 are formed. The unused area C1 is a circular area in which unused drills calculate the deviation between each of the plurality of sampling coordinate points and the center, respectively, and use their average as a radius. Alternatively, the distance between the coordinate point farthest from the center and the center among the plurality of sampling coordinate points may be a radius. Similarly, it is possible to form the end-of-use region C2.

The determination unit 38 draws an interpolation line L1 between the starting point P1 and the ending point P2 when measuring the degree of wear of the inspection target drill. Then, the width and length of the tip region of the drill blade measured by the measuring unit 34 are plotted as the input point P3, and a line L2 is drawn from the input point P3 to the interpolation line L1. The degree of wear is specified by the ratio of the intersection point P4 located on the interpolation line L1. Moreover, when the intersection point P4 arises in the line segment located in the unused area C1 among the interpolation lines L1, the degree of abrasion is determined to be 0% in any part of the line segment. Orientation, when the intersection point P4 occurs in the line segment located in the end-of-use area C2 among the interpolation lines L1, the degree of abrasion is determined to be 100% in any part of the line segment.

An error is determined with respect to the input point P3 which cannot draw the repair line L2 on the interpolation line L1. In order to reduce the error, the interpolation line L1 may be extended on the side of the increase direction of the unused area C1, and a margin may be provided. It is possible to extend the interpolation line L1 also on the reduction direction side of the end-of-use area C2.

Fig. 7 is a diagram showing the relationship between the aspect ratio (width / length) of sampling data and the number of holes drilled in the same object under the same environment. The vertical axis shows the aspect ratio of the sampling data, and the horizontal axis shows the number of holes drilled. 7 shows drills located in the first stage, which are located at 0 holes, 1000 holes, 2000 holes, 4000 holes, and drills located in the second stage, which are located at 0 holes, 1000 holes, 2000 holes, 3333 holes, and the third stage. A plurality of sampled aspect ratios are plotted in a total of 11 states with 0, 1000 holes and 2000 holes with a drill. Here, the above-mentioned state of end of use is set to 4000 holes in the first stage, 3333 holes in the second stage, 2000 holes in the third stage, and a punched state.

In FIG. 7, the average value is calculated | required for every said state, and the trend line which connected each average value is derived in each of a 1st stage, a 2nd stage, and a 3rd stage. Here, when observing each transition line, it can be seen that the wear is greatly reduced at the initial stage of the start of drilling, and the wear decreases as the number of holes to be terminated approaches.

FIG. 8 is a view for explaining a second example of processing for specifying the degree of wear of a drill based on the start point information and the end point information. In the first processing example shown in FIG. 6, the interpolation line was interpolated between the starting point P1 and the ending point P2. In the second processing example, the transition line L3 obtained by the method shown in FIG. 7 was connected between them. This transition line L3 wears greatly in the area | region close to starting point P1, and wear of width becomes small as it approaches the end point P2. Although shown by the trend curve in FIG. 8, as shown in FIG. 7, the representative point (for example, an average point) in each state may connect each straight line.

The determination unit 38 can specify the degree of wear of the inspection target drill from the positional relationship between the transition line L3 and the input point P3. For example, a line perpendicular to the interpolation line L1 is drawn from the input point P3, and the intersection point P5 between the line and the transition line L3 is obtained. It is possible to specify the degree of wear by the proportion of the intersection P5 located on the transition line L3.

9 shows an example of the inspection result screen 50 of the drill displayed on the display unit 40. This screen 50 displays at least the corresponding stage of the inspection target drill, and the degree of wear in the stage. The stage column 52 indicates the current stage to which the drill to be inspected corresponds, and the example in FIG. 9 indicates that it corresponds to the second stage. The use state column 54 indicates the use state of the drill and displays any of unused, in use, and unavailable. The first wear degree column 56 displays the wear degree numerically in the stage, here the second stage. The second wear degree column 58 displays the wear degree in a gauge at the stage.

10 is a flowchart showing the basic operation of the drill inspection device 100 according to the present embodiment. The image processing unit 32 adjusts the density value of the tip image of the drill blade picked up by the imaging unit 20 (S60). The image processing unit 32 adjusts and binarizes the density value to align the image (S62). Further, the subsequent processing may be performed using the original image without adjusting the density value. The measuring unit 34 measures the shape information of the tip of the blade in the image processed by the image processing unit 32 (S64). The determination unit 38 combines the shape information of the tip area of the measured blade with the reference data registered in the storage unit 36 (S66). As a result of the combination, the determination unit 38 determines the state of the tip of the blade of the inspection target drill (S68). For example, determine which stage in the lifecycle the drill is at.

As described above, according to the present embodiment, it is possible to accurately determine the state of the drill by a simple process. That is, since the inspection target drill can quantitatively determine the stage in the corresponding life cycle using shape information such as the length and width of the tip area of the blade, it is possible to accurately determine the timing of polishing or digging. . Since it is possible to make a quantitative determination, it is possible to judge the accuracy better than the timing determination of the polishing and digging depending on the number of holes.

In addition, since a simple measurable value of shape information, which consists of the length and width of the leading edge region of the blade, is used as a parameter, it is possible to determine by simple processing and high-speed processing is possible.

In addition, in this embodiment, it is possible to estimate abrasion degree. The said patent document 1 performs only the process which detects a defective article, and it is impossible to specify to the extent of abrasion.

In addition, as shown in Fig. 5, the area divided by the shape information of the tip area of the blade statistically obtained from the sampling data of each state is good for specifying the stage, so that the corresponding stage of the inspection target drill ( It can be judged satisfactorily.

In the above, this invention was demonstrated based on embodiment. This embodiment is an illustration, and it will be understood by those skilled in the art that various modifications are possible in each component or combination of each processing process, and furthermore, such a modification is also in the scope of the present invention.

Hereinafter, typical modifications will be described. In this modification, the degree is further improved by adding another parameter in addition to the shape information used as the length and width of the tip region of the blade. In this modification, the width X1 to Xm of the pickle included in the tip region of the blade shown in Fig. 4 is measured in the longitudinal direction as an additional parameter, and a parameter obtained from the shape curve following this is used. More specifically, the area obtained by integrating a predetermined number of rows and widths of the pickles included in the tip region of the blade in the longitudinal direction is used.

The storage unit 36 further stores, as a part of the reference data, the area obtained by integrating the width X1 to Xm of the pickles included in the tip area of the blade by a predetermined number of rows (m rows) in units of stages in units of stages. do. Here, the predetermined number of rows may be the number of all pixels from the edge of each pickle to the tip, the number of all pixels from the edge of one pickled to the edge of the other pickled, or about tens of pixels from the edge of each pickle. good. Moreover, the said area may be calculated | required with both among two pickles, and the area may be calculated | required only with respect to one.

The measurement part 34 measures the width | variety of pickles contained in the front end area | region of the drill which is a test | inspection object, at least the predetermined number of rows in the longitudinal direction.

The storage unit 36 can use the start point information and the end point information as the reference data. At that time, their information is defined by three parameters obtained by adding the area to the length and width of the tip area of the blade. Specifically, the centers are obtained by calculating the average of each of the length, width, and the area of the tip region of the blade from a plurality of sampling pixels of the unused drill. It is possible to set this as starting point information. In the orient, from the plurality of sampling pixels of the drill to be terminated, the centers are obtained by calculating the average values of the lengths, widths, and respective areas of the leading end areas of the blades. It is possible to set this as end point information.

In addition, the storage unit 36 may further store the change characteristics defined by the length, width, and the area of the tip region of the blade by use of the drill for each stage in the life cycle of the drill. Also in this change characteristic, it is possible to extend the viewpoint considered as the change characteristic in the two-dimensional space prescribed | regulated by the length and width mentioned above.

The determination unit 38 calculates the area by integrating the widths X1 to Xm of the pickles for the number of rows measured by the measurement unit 34. When calculating this area, it is possible to reduce the amount of calculation by smoothing a shape curve of the width X1 to Xm of pickling using a predetermined filter. It mentions later in detail.

The determination unit 38 combines the length, width and the area measured by the measurement unit 34 with the reference data stored in the storage unit 36 to specify the stage to which the drill to be inspected corresponds. .

For example, when the start point information of the first half stage and the end point information of the second half stage are stored as reference data for each stage corresponding to the polishing frequency, it is possible to specify as follows. The determination unit 38 specifies the start point information or the end point information defined by the three-dimensional coordinates closest to the three-dimensional coordinates defined by the length, the width, and the calculated area of the tip area of the measured blade, and the starting point information. Or it is specified whether it is located in the first half stage or the second stage of the Nth stage to which end point information belongs. In addition, it is also possible to specify whether it is located in the first half stage or the second half stage of the Nth stage by the following method. That is, in the three-dimensional space, the shape information of the tip area of the blade obtained from the unused drill of each polishing number and the sampling image of the drill to be terminated is plotted. Based on the results, a predetermined molding identifier or non-linear identifier, for example, a neural network or a support vector machine, is constructed. Thereby, it is possible to divide the three-dimensional space into the first stage to the Mth stage (M = maximum number of polishing + 1) divided into first and second stages, respectively. In this case, the data for specifying each area, such as the boundary line of each area, becomes the reference data.

Further, the judging section 38 specifies the degree of wear in the three-dimensional space defined by the length, width, and area, in the same manner as to specify the degree of wear in the two-dimensional space defined by the length and width described above. It is possible to.

Fig. 11 is a view showing a shape curve following the width X1 to Xm of pickling. The vertical axis represents the width X1 to Xm of the pickling as a deviation, and the horizontal axis shows the number of rows in the longitudinal direction of the pickling. The deviation here is a value obtained by subtracting the average value of the widths X1 to Xm of the pickles, respectively, from the widths X1 to Xm of the pickles. Referring to FIG. 11, it can be seen that the edge portion and the tip portion of the pickled are thinned. In addition, the determination part 38 can determine that a deficiency exists when the deviation exceeding the tolerance limit determined experimentally and empirically appears. In addition, it may be determined that there is a deficit between adjacent deviations when there is a change exceeding an experimentally and empirically obtained allowable limit value.

Fig. 12 is a diagram showing the area obtained from the shape curve of the width X1 to Xm of pickling. 12 shows an example in which the area is obtained by integrating the widths X1 to Xm of the pickles defined by 40 rows and the deviation from the edges. When calculating this area, the shape curve may be smoothed using a Gaussian filter. In addition, each deviation is normalized to a value from 0 to 1. Alternatively, standard deviation or dispersion may be used instead of the area.

FIG. 13 is a diagram showing sampling data of an area obtained from a shape curve having a width X1 to Xm of pickling. In FIG. 13, sampling data is obtained every seven of the seven states of the drill including the missing state described in FIG. 2. Each area is obtained by integrating 40 rows from the edges. It can be seen that a certain trend exists in each state. As a matter of course, irrespective of the number of times of polishing, unused drills tend to have a large area, and worn drills that have progressed wear tend to have a small area.

As described above, according to this modification, it is possible to further increase the accuracy of the inspection by the above-described embodiment. That is, in addition to the length and width of the leading edge region of the blade, it is possible to specify more precisely which stage corresponds to which stage by including the above-mentioned area in which the stage is specified. It is also possible to easily detect the missing state.

In addition, in the above modification, in addition to the length and width of the tip region of the blade, the area obtained from the shape curve for the width X1 to Xm of pickling is used, but other parameters may be employed. For example, the shape curve itself which connected the width | variety X1-Xm of pickling may be used as a parameter. The determination part 38 compares each point which comprises the shape curve measured by the measuring part 34, and each corresponding point which comprises the shape curve stored in the memory | storage part 36, and the difference It is possible to determine a defect with respect to an area including a point exceeding a threshold obtained experimentally and empirically. Moreover, you may use the average value, variance, or standard deviation of the width | variety X1-Xm of pickling as a parameter. In addition, even if the width X1 to Xm of the pickling included in the tip area of the blade obtained from the photographed pixel, the area of the curve which is the average value of the pickling width and the difference of the pickling corresponding to the reference pixel, the variance, the standard deviation, or the deviation thereof are used. good. In addition, you may use the oriental parameter about picking length Y1-Xp, not picking width X1-Xm. Furthermore, not a three-dimensional parameter space, but a four-dimensional or more parameter space in combination thereof may be used.

Moreover, another modification is demonstrated. In this modification, the judgment is made by using other parameters in addition to the shape information such as the length and width and the area of the tip area of the blade or in place of at least one thereof, or the degree is further improved. In this modification, as an additional parameter, the angle is measured on the tangential line of the outline of the edge area of the blade and used as a parameter. Hereinafter, a specific example is shown.

As shown in Fig. 2, the tip of the drill blade has smooth edges before use, while wear has advanced with use. This property is extracted as a directional characteristic using a Gabor filter. That is, a horizontal component is extracted by applying a Gabor filter to the tip image of the blade, and a straight line is extracted by Hough transforming the components. The slope of the straight line is used as the parameter. It is possible to include this parameter as part of the reference data.

Here, the Gabor filter will be described. The following formula (1) represents a Gabor function.

F (x, y) = e-π (x2a2 + y2b2) cos (u + v)

u = fcosθ, v = fsinθ, f: frequency

The output image F (x, y) is considered to represent the input image as a wavelet of the Gabor function, and the range characteristic of the wavelet is changed according to the parameters a, b and the periodic characteristics thereof according to the parameters u and v. It is possible to let. In this way, the Gabor filter can have azimuth selectivity due to a change in the direction of the filter, and can be extracted from an overall characteristic to a local characteristic by changing the frequency of the filter.

In addition, in the above-described embodiment, the determination unit 38 calculates a simple Euclidean distance when combining the coordinates obtained by measurement and the coordinates corresponding to the starting point information or the ending point information, and calculates a simple Euclidean distance to the nearest starting point information or ending point. Information was obtained. In this regard, the Mahalanobis distance may be calculated in consideration of the dispersion of the learning data, that is, the widening.

9 shows an example of the inspection result image 50 of one drill. 14 is a diagram showing an example of the inspection result screen 60 of the plurality of drills displayed on the display unit 40. This screen 60 is a display method applied to the case where a plurality of drills are continuously examined by looking at a cartridge. Fig. 14 shows, on one screen, an inspection result when a total of 16 drills attached to a 4x4 cartridge are continuously inspected. Each display window 61 has shown the wear degree of each drill. Abrasion is visually represented by the size of the painted area. In addition, you may display the wear degree which carried out color division. For example, it is possible to indicate that the closer to red, the higher the wear. The display form of FIG. 14 and the display form of FIG. 9 may be displayed in combination, and the corresponding stage may be recognized as the same screen.

BRIEF DESCRIPTION OF THE DRAWINGS The figure for demonstrating the stage in the life cycle of a drill.

Fig. 2A is a view of a tip of a drill blade in an unused state of a new article (0 polishing) taken in the direction along the rotation axis.

It is a figure which image | photographed the front-end | tip of the drill blade in the state where the use of new article (0 time grinding) is complete | finished.

2C is an image of the tip of a drill blade in an unused state after polishing once.

2D is an image of the tip of a drill blade in a state where use after finishing polishing is finished;

2E is an image of the tip of a drill blade in an unused state after two polishing operations.

2F is an image of the tip of a drill blade in a state where use after the polishing two times is finished;

2G is an image of the tip of a drill blade in a missing state;

3 is a view showing the configuration of a drill inspection device according to an embodiment of the present invention.

4 is a diagram for explaining a parameter specified from an image including the leading region of a blade;

Fig. 5 is a diagram in which sample data is plotted in a two-dimensional parameter space defined by shape information of a tip region of a blade.

FIG. 6 is a view for explaining a first processing example for specifying information of wear of a drill on the basis of start point information and end point information; FIG.

Fig. 7 is a graph showing the relationship between the aspect ratio (width / length) of sample data and the number of holes drilled.

8 is a view for explaining a second processing example for specifying the degree of wear of a drill based on the start point information and the end point information.

9 is a diagram illustrating an example of an inspection result screen of a drill displayed on a display unit;

10 is a flowchart showing the basic operation of the drill inspection device according to the present embodiment.

FIG. 11 is a view showing a shape curve of a pickled width. FIG.

Fig. 12 is a view showing the shape of obtaining the area from the shape curve of the width of pickling;

FIG. 13 is a diagram showing sample data of an area obtained from a shape curve of a pickled width. FIG.

14 is a diagram illustrating an example of a test result screen of a plurality of drills displayed on a display unit.

<Description of the code>

DESCRIPTION OF SYMBOLS 1 Drill, 20 imaging part, 30 calculation part, 32 image processing part, 34 measuring part, 35 setting part, 36 memory part, 38 judgment part, 40 display part, 100 drill inspection apparatus.

Claims (19)

A measuring unit for measuring the shape information of the tip region of the blade in the tip image of the drill blade imaged; And a judging section for specifying, from the shape information measured by the measuring section, stages in the life cycle of the drill, which are classified according to an increase in the number of times of grinding the drill in order to reuse the drill. . The method of claim 1, And a storage section for storing reference data of the length and width of the tip area of the drill blade for each stage reflecting the number of polishing times in the drill life cycle, The measuring unit measures the length and width of the tip region of the blade in the tip image of the blade, The determination unit specifies the stage to which the inspection target drill corresponds by combining the length and width measured by the measurement unit with reference data for each stage stored in the storage unit. Drill inspection device. The method of claim 2, The storage unit further stores, in units of stages, the change characteristic defined by the length and width of the tip region of the day by the use of a drill, The determination unit obtains a degree of wear at the stage to which the drill to be inspected corresponds by combining the length and width measured by the measurement unit with the change characteristics stored in the storage unit. Device. The method of claim 2 or 3, The storage unit further stores, as part of the reference data, an area obtained by integrating the width of the pickled in the tip region of the blade in the longitudinal direction by a predetermined length from the edge of the pickled, in units of stages. The measuring unit measures the width of the pickling included in the tip region of the blade of the inspection target drill at least the predetermined length in the longitudinal direction, The determination unit calculates an area by integrating the width of the pickles measured by the measuring unit, and combines the length, width and the area measured by the measuring unit with the reference data stored in the storage unit. Drill inspection device, characterized in that. The method of claim 1, The determination unit specifies the degree of wear at a particular stage, A display unit which displays the stage and the wear degree specified by the determination unit, Drill inspection apparatus characterized in that it further comprises. A measurement step of measuring the length and width of the tip region of the blade in the tip image of the drill blade imaged; A determination step of specifying and determining the stages on the life cycle of the drill, which are divided according to the increase in the number of times of grinding the drill in order to reuse the drill, from the shape information measured by the measuring step; Drill inspection method characterized in that it comprises a. The method of claim 6, Each step of reflecting the number of times of polishing in the drill life cycle further includes a registration step of registering in advance reference data of the length and width of the tip region of the drill blade. The measuring step measures the length and width of the tip region of the blade in the tip image of the blade, The determination step is characterized in that the inspection target drill specifies the corresponding step by combining the length and width measured by the measurement step with reference data for each step registered by the registration step. Drill inspection method. A measurement process for measuring the length and width of the tip region of the blade in the tip image of the drill blade imaged; A determination process for specifying a stage in the life cycle of the drill, which is divided according to an increase in the number of times of grinding the drill for reusing the drill, from the shape information measured by the measurement process; Recording medium recording a drill inspection program, characterized in that the computer is executed. A storage unit for storing the change characteristics defined by the shape information of the tip area of the blade by the use of the drill for each stage in the drill's life cycle, which is divided according to the increase in the number of grinding times of the drill for reusing the drill; , A measuring unit for measuring the shape information of the tip region of the blade in the tip image of the drill blade imaged; A judging section for calculating the wear level in the stage to which the drill corresponds and the stage by combining the shape information measured by the measuring section with the change characteristics stored in the storage section; Drill inspection apparatus characterized in that it comprises a. The method of claim 9, And said change characteristic is represented by a transition curve defined by the length and width of the tip region of said blade. Registration step of pre-registering the change characteristics defined by the shape information of the tip area of the blade by the use of the drill for each stage in the drill's life cycle, which is divided according to the increase in the number of grinding times of the drill for reusing the drill. and, A measurement step of measuring the shape information of the tip region of the blade in the tip image of the drill blade photographed; A determination step of determining the wear level in the stage to which the drill corresponds and the stage by combining the shape information measured by the measurement step and the change characteristic registered in the registration step, Drill inspection method comprising the. Registration processing for pre-registering the change characteristics prescribed by the shape information of the tip area of the blade by the use of the drill for each stage in the drill's life cycle, which is divided according to the increase in the number of grinding times of the drill for reusing the drill. Wow, Measurement processing for measuring the shape information of the tip area of the blade in the tip image of the drilled blade imaged; A determination process of calculating the wear level at the stage to which the drill corresponds and the stage by combining the shape information measured by the measurement process with the change characteristic registered by the registration process; Recording medium recording a drill inspection program, characterized in that the computer is executed. delete delete delete delete delete delete delete

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