JP2004069511A - Method and apparatus for automatically measuring tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for automatically measuring a tool and measuring a cut shape of the tool and the diameter and length of the tool, through the use of a conventional NC (numerical control) machine tool and a laser range finder. <P>SOLUTION: The method and the apparatus for automatically measuring the tool comprises a first process and a second process. In the first process, the tool 15 is moved in a direction, which substantially intersects its axis at right angles, as the tool 15 is rotated by the NC machine tool 11, the location of the center line of the tool 15, as viewed from the laser range finder 13 is detected from a minimum distance value of the laser range finder 13. In the second process, the center location of measurement of the laser range finder 13 is made to coincide with the location of the center line of the tool 15, and then moved in its axial direction, as the tool 15 is rotated. From the relation between the location of movement of the tool 15 and the laser range finder 13, the cut external shape of the tool 15 is determined. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and apparatus for automatically measuring a cutting shape of a tool (that is, a cutting tool) used for an NC machine tool such as an NC milling machine or an NC machining center, and a diameter and a length of the tool without contact.
[0002]
[Prior art]
Conventionally, as a tool used in an NC machine tool (specifically, an NC milling machine, an NC machining center), for example, there are a ball end mill, a flat end mill, a radius end mill, and the like. Since they can be defined, they are used to input the tool data to the machine tool.
[0003]
[Problems to be solved by the invention]
However, the tool may be worn or damaged by use.If the tool data is input by defining the diameter of the tool, the radius of the characteristic portion, and the center position as in the conventional case, the actually cut work is not obtained. May be different from the required work. Therefore, it is preferable to measure the cutting shape of a tool (that is, a cutting tool) and to input this as tool data to the NC machine tool, but there is a problem that a special device is required.
On the other hand, NC machine tools generally have an input terminal for controlling the movement of a tool from the outside, and further irradiate a laser beam to an object and use the reflected light to accurately measure the distance to the object. Laser rangefinders are also commonly known.
The present invention has been made in view of such circumstances, and provides an automatic tool measuring method and apparatus for measuring a cutting shape of a tool, a diameter and a length of a tool using a conventional NC machine tool and a laser distance meter. The purpose is to:
[0004]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided an automatic tool measuring method for measuring a cutting contour of a tool mounted on a spindle head of an NC machine tool by using a laser distance meter fixedly arranged to face the tool. An automatic measuring method of a tool, wherein the tool is rotated by the NC machine tool while the tool is moved in a direction substantially perpendicular to the axis of the tool, and the minimum distance value of the laser distance meter is used as the tool. A first step of detecting the center line position of the tool as viewed from the laser distance meter, and aligning the measurement center position of the laser distance meter with the center line position of the tool, and then rotating the tool in the axial direction And a second step of obtaining a cutting contour of the tool from a relationship between the moving position and the laser distance meter. Since the cutting contour of the tool is generally determined at its outer end, the laser distance meter determines the center line position as viewed from the laser distance meter with respect to the longitudinal position (ie, each position in the axial direction). By obtaining the minimum distance position, the cutting outline can be specified.
[0005]
The automatic tool measuring method according to the second invention is the automatic tool measuring method according to the first invention, wherein the tool obtained in the first step is provided between the first step and the second step. In the state where the center line position of the is adjusted to the measurement center position of the laser distance meter, by using the NC machine tool to move the tool in the axial direction, providing an intermediate step of measuring the tip position of the tool, In the second step, the tool is moved with reference to the tip of the tool measured in the intermediate step, and the cut outer shape is measured. Thereby, the cutting shape of the tool can be obtained with less waste of measurement.
[0006]
The method for automatically measuring a tool according to a third invention is the method for automatically measuring a tool according to the second invention, wherein a reference height position of a spindle head on which the tool is mounted is determined in advance by the laser distance meter. A tool height from a reference height position to a tip position of the tool is obtained.
The automatic measuring method for a tool according to a fourth invention is the automatic measuring method for a tool according to the first to third inventions, wherein a diameter value (D) of a perfect circle portion at a specific height position of the tool is measured. From the diameter value (D) and the cutting contour at a specific height position measured by the laser distance meter, the axial center position of the tool is specified. Thus, the center coordinates and the radius of the cutting contour of the tool can be specified.
[0007]
An automatic tool measuring apparatus according to a fifth aspect of the present invention is an automatic tool measuring apparatus that is attached to an NC machine tool and measures a cutting contour of a tool attached to the NC machine tool. A laser distance meter arranged to face a tool attached to an NC machine tool and measuring a distance to the tool, and an output value of the laser distance meter as an input, and rotation and movement of the tool of the NC machine tool A control device having a tool measurement program including a command of the laser range finder, wherein the tool measurement program moves the tool in a direction substantially orthogonal to the axis of the tool while rotating, First measurement means for specifying the center line position of the tool as viewed from the laser distance meter from the measured value, and the first measurement means moves the laser distance meter to the center line position of the tool. The tool is moved in the axial direction, the second measuring means for detecting the tip position of the tool, and the laser distance meter is arranged to be oriented to the center line position of the tool, A third measuring unit configured to move the tool in the axial direction while rotating the tool and specify a cutting contour of the tool from a minimum distance value of the laser distance meter.
[0008]
A tool automatic measuring device according to a sixth invention is the tool automatic measuring device according to the fifth invention, wherein the tool measuring program measures a reference height position of a spindle head to which the tool is mounted, and A head position measuring means for making the machine tool recognize is provided. Thereby, the NC machine tool can recognize the height position of the tool.
An automatic tool measuring apparatus according to a seventh aspect is the tool automatic measuring apparatus according to the fifth or sixth aspect, wherein input means for inputting a diameter of the tool is provided, and the tool measuring program includes: Tool diameter calculating means for specifying the axis center position of the tool from the diameter input from the input means and the cutting contour of the tool corresponding to the measured diameter position, and specifying the cutting radius or the cutting diameter of the tool. ing. Thereby, the axial position of the tool, that is, the axial position of the cutting contour and its radius can be specified.
An automatic tool measuring apparatus according to an eighth aspect of the present invention is the automatic tool measuring apparatus according to the fifth to seventh aspects, wherein the command signal sent from the control device to the NC machine tool is a rotational speed of the tool. , A feed signal in the width direction of the tool, and a feed signal in the axial direction of the tool.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
Here, FIG. 1 is an explanatory view of an automatic measuring device for a tool according to an embodiment of the present invention, FIGS. 2 to 4 are operation flowcharts of the automatic measuring device for the same tool, and FIGS. FIG. 4 is an explanatory diagram of the operation of the automatic measuring device.
[0010]
As shown in FIG. 1, an automatic tool measuring apparatus 10 according to an embodiment of the present invention is used by being attached to an existing NC machine tool 11, and a predetermined tool measuring program is described therein. It has a personal computer (an example of a control device) 12, a laser distance meter (laser head) 13, and a control device 14 for the laser distance meter. Hereinafter, these will be described in detail.
The NC machine tool 11 is an existing device and includes a spindle head 16 for mounting a cutting tool 15 (for example, a flat end mill, a ball end mill, and a radius end mill). Rotation, movement in XYZ directions, and speed control of these can be performed. The NC machine tool 11 is provided with an external connection terminal. The NC machine tool 11 is provided with a system different from the command from the control device of the NC machine tool 11, and the tool 15 is moved in the XYZ directions at a preset speed based on a command from the personal computer 12. , And the tool 15 can be rotated.
[0011]
The personal computer 12 is an ordinary commercially available personal computer, has a CPU, a RAM, a ROM, and an interface therein, and cooperates with the control device 14 for the laser distance meter and the NC machine tool 11. The laser range finder 13 irradiates the target object with laser light from a light source, forms an image of the reflected light on a position detecting element arranged at a position different from the light source, and displays the image on the position detecting element corresponding to the distance to the target object. Is used to measure the distance from the laser distance meter 13 to the target object. It should be noted that a laser distance meter of a type that measures the distance by utilizing the phase shift between the incident laser light and the reflected laser light can be used.
[0012]
Therefore, the laser range finder 13 includes a laser beam projecting element and its lens system, and a reflected laser beam lens system and a position detecting element. These controls are processed by the laser range finder controller 14, and finally the distance (L) from the laser range finder 13 to the object is output as a digital electric signal. 12 is input. The laser distance meter 13 is fixed to the NC machine tool 11 so as to face the tool 15.
A tool measurement program is described in the personal computer 12. The tool measurement program moves the tool 15 in a direction substantially orthogonal to the axis of the tool 15 while rotating the tool 15, and obtains a measurement value from the laser distance meter 13. First measuring means for specifying the axis of the tool 15 and its width, and the laser distance meter 13 is disposed so as to be directed to the center line position determined by the first measuring means, and the tool 15 is moved in the axial direction. Moving the tool 15 so that the measuring point of the laser distance meter 13 is located at the tool 15 with the second measuring means for detecting the tip position of the tool 15 and the tool 15 as a reference position. The third measuring means for measuring the cutting contour of the tool 15 from the moving distance of the tool 15 and the minimum distance value of the laser range finder 13 and the height position of the spindle head 16 for mounting the tool 15 are measured. The position of the head to be recognized by the machine 11, the diameter value (D) input from the input means for inputting the diameter of the tool 15, and the axis of the tool 15 from the cutting contour of the tool 15 corresponding to the measured diameter position. It has a tool diameter calculating means for determining the position and specifying the cutting radius or the cutting diameter of the tool 15.
[0013]
First, as a preparation stage, the reference height position of the spindle head 16 on which the tool 15 is mounted is measured by the head position measurement means, and the NC machine tool 11 recognizes the reference height position. This program may use the program in the NC machine tool 11 or may be separately incorporated in the personal computer 12. First, a jig having a known protruding length (for example, 100 mm) from the lower end of the spindle head 16 is attached to the spindle head 16, the laser distance meter 13 is oriented in that direction, and the measurement point of the laser distance meter 13 is set at 100 mm. This position is set as the reference height position (Z = 0) of the spindle head 16. Therefore, the lower end position of the spindle head 16 is +100 mm.
Next, the jig is removed from the spindle head 16 and the tool 15 to be measured is attached to the spindle head 16. The tool 15 measures the diameter value (D) of the upper and lower perfect cylindrical portions (true circular portions) with a micrometer (either a mechanical type or a laser type) or the like. The height position (a) in the vertical direction where the diameter is measured is also measured. However, since the same diameter portion has a width in the vertical direction, it is not necessary to measure accurately.
[0014]
Next, the first measuring means (performing the above-described first step) will be described with reference to FIG.
First, the initial search width (W), the number of search divisions (N), the number of samplings per measurement (m), the number of tool rotations (R), and the tool feed speed (V) are determined and input into the personal computer 12. I do. For this, an input screen is provided in the personal computer 12, from which an input is made by a keyboard or a mouse. The initial search width (W) is the horizontal feed of the tool 15 by the NC machine tool 11, and it is necessary that the measurement position of the laser distance meter 13 is always included in the horizontal search. Therefore, since the diameter value (D) of the tool 15 is known, the laser distance meter 13 is directed to the tool direction, and a value about 1.5 to 2 times the tool diameter is input. The search division number (N) indicates how many parts of the search width are measured. Usually, a value of about 10 to 100 is set. The number of samplings (m) in one measurement is measured by rotating the tool 15 while the tool 15 is stopped at the measurement position, and the number of times of sampling performed in one measurement is input. This is because the outer shape of the tool 15 is not circular in cross section but has irregularities, so that when the laser range finder 13 just measures a concave portion, the measured value of the laser range finder 13 actually increases. The larger the number, the better, but the measurement takes a long time. Enter the tool rotation speed (R). This may be the cutting speed of the tool 15 or a smaller value. The feed speed (V) of the lateral feed of the tool 15 is input. If the time is too slow, the measurement takes a long time, so that about 1 to 5 mm / sec is sufficient (the above is the processing S1). The tool 15 is mounted vertically on the spindle head 16, and the tool 15 moves horizontally with respect to the laser distance meter 13, that is, in a direction perpendicular to the axis as shown in FIG. In FIG. 5, C indicates the axial center position of the tool 15, and P indicates the center line position of the tool 15 as viewed from the laser distance meter 13.
[0015]
Next, one step width of the lateral feed of the tool 15 is calculated, and is calculated as (search width (W) / division number (N)). Then, the movement completion time of one step width of the tool 15 is calculated. This can be easily calculated by performing the calculation of W / (N · V) (process S2). Thereafter, a signal of a one-step movement command (a feed signal in the width direction) is transmitted from the personal computer 12 to the NC machine tool 11 (process S3). As a result, the tool 15 moves, but the completion of the one-step movement is performed by confirming that the movement completion time of the tool 15 calculated in the process S2 has elapsed. Thereby, the tool 15 moves to a predetermined position and stops (process S4).
Next, the laser distance meter 13 is operated to start capturing measurement data (process S5). The acquisition of measurement data is performed until the number of sampling times is achieved. Although each sampling time depends on the processing capability of the laser distance meter 13, it is usually performed at about 1/500 to 1/10 sec (the above is the processing S6). In step S3, a one-step movement command is output to the NC machine tool 11. However, when the NC machine tool 11 does not receive a subsequent signal, the NC machine tool 11 malfunctions. 11 is output. As a result, the NC machine tool 11 holds the stopped state (process S7).
[0016]
Then, the minimum value within the cutoff value is extracted from the collected data. This cut-off value is a value naturally expected from the measured value of the laser range finder 13, and a value out of the range is provided to exclude as a malfunction (process S8). Then, it is determined whether or not the set search width has been reached, that is, whether or not the entire search width has been measured (step S9). If the set search width has not been reached, the transmission stop of NULL is stopped. (Step S10), and repeat Steps S3 to S9. As a result, the minimum value (minimum distance value) from the laser distance meter 13 to the tool 15 is measured. Next, the step number (x) at which the minimum value is measured is extracted (process S11). After confirming that the step number (x) is between the first value and the last value (process S12), the search width is changed between (x-1) and (x + 1) (process S13). Then, it is confirmed that the search range is equal to or higher than the measurement accuracy (step S14), the transmission of NULL is stopped (step S15), and the movement command to the measurement start point is transmitted. As a result, the spindle head 16 of the NC machine tool 11 moves to a predetermined position (process S16). Thereafter, the processes S2 to S15 are repeated, and it is confirmed that the search range is smaller than the predetermined accuracy range, and the entire process is terminated (process S14). The position at which the minimum value L (see FIG. 5) from the laser range finder 13 is detected by the first measuring means thus configured is the center line position of the tool 15 viewed from the laser range finder 13. The data (X value) of the center line position is measured by the NC machine tool 11.
[0017]
Next, the second measuring means (intermediate process) will be described with reference to FIG. 3, but the second measuring means is the center line position of the tool 15 determined by the first measuring means (laser Using the NC machine tool 11, the lowermost position (tip position) of the tool 15 is measured with reference to the distance meter 13).
First, the initial measurement (maximum search) height (H), the number of search divisions (n1), the number of samplings (m1) at a pitch (H / n1) for performing one measurement, and the number of tool revolutions (R1) The tool vertical feed speed (V1) is determined and input into the personal computer 12. For this, an input screen is provided in the personal computer 12, from which an input is made by a keyboard or a mouse. The initial measurement height (H) is a vertical feed of the tool 15 by the NC machine tool 11, and the measurement position of the laser distance meter 13 must be included therein, and the tip of the tool 15 must be included therein. Required (see FIG. 6). In setting the height, the height is determined by the distance in the vertical direction (Z-axis) with respect to the reference height position of the NC machine tool 11 measured earlier. Specifically, the NC machine tool 11 is operated in a state where the measurement center position of the laser distance meter 13 matches the center line position of the tool 15, and an appropriate value is input. The search division number (n1) indicates how many parts of the search width are to be measured. Usually, a value of about 10 to 100 is set.
[0018]
The number of samplings (m1) in one measurement is measured by rotating the tool 15 while the tool 15 is stopped at the measurement position, and the number of samplings to be performed in one measurement is input. This is because the outer shape of the tool 15 is not circular in cross section but has irregularities, so that when the laser range finder 13 just measures a concave portion, the measured value of the laser range finder 13 becomes larger than the actual value. The larger the number, the better, but the measurement takes a long time. Enter the tool rotation speed (R1). This may be the cutting speed of the tool 15 or a smaller value. The vertical feed speed (V1) of the tool 15 is input. If it is too slow, the measurement takes a long time, so that about 1 to 5 mm / sec is sufficient (the above is the processing St1).
[0019]
Then, the movement completion time of one step height in one measurement is calculated. This can be easily obtained by dividing the measured height by the number of search divisions (n1) and further dividing by the longitudinal feed speed (V1) of the tool 15 (Process St2). Next, a one-step longitudinal movement command (a feed signal in the axial direction) is transmitted to perform movement (processing St3), and it is checked whether the movement completion time has elapsed (processing St4). Import is performed (Process St5). It is confirmed that the data acquisition has reached the number of samplings (m1) (Process St6). After issuing the one-step vertical movement command to the NC machine tool 11 in the process St3, a NULL signal is issued to the NC machine tool 11 to stop the movement of the NC machine tool 11 (process St7). After the above-described process St6, the minimum value of the data within the cutoff value is detected (process St8).
[0020]
Thereby, the distance from the laser distance meter 13 to the tool 15 is measured. Next, the presence or absence of valid measurement data (ie, minimum data) within a predetermined value is checked (Step St9). If there is measurement data, it means that the tool 15 is present. The processing is performed (processing St10), the processing returns to processing St3, and the processing St3 to processing St9 are repeated. If there is no valid data within a predetermined value, it means that the end of the tool 15 has been passed. The step number N is detected by the measurement (Step St11), and the search range is changed to the range of Step N-1 and Step N + 1 (Step St12). Then, it is confirmed that the search range is not less than the measurement accuracy (Step St13), the transmission of NULL is stopped (Step St14), the process returns to Step St2, and the above steps are repeated. Then, it is confirmed that the search range has fallen below the measurement accuracy, and the processing is terminated. The position of the tip (lower end) of the tool 15 is detected by the second measuring means. Since the position of the spindle head 16 of the NC machine tool 11 is measured in advance, the height of the tool 15 can be recognized by the NC machine tool 11.
[0021]
The third measuring means (processing in the second step) for specifying the cutting contour of the tool 15 using the results measured by the first and second measuring means will be described with reference to FIG.
First, the measurement height h (see FIG. 6) of the tool 15 to be measured, the measurement pitch, the number of times of sampling at the measurement position, the number of tool rotations, and the tool feed speed are set. Here, the measured height h of the tool 15 is set to include the height of the cuttable tool 15 based on the lower end position of the tool 15. The smaller the measurement pitch is, the more preferable it is. However, when the number is small, it takes time, and when the number is coarse, the measurement accuracy is reduced. If the processing accuracy of the tool 15 is further required, it is set more finely. The rotation speed of the tool 15 may be the same as that of the first and second measuring means, and is usually about 100 to 1000 rpm. The feed speed of the tool 15 may be the same as that of the first and second measuring means (above, processing Sr1).
[0022]
Next, one measurement pitch movement command completion time is calculated, which is the same as that of the first and second measuring means (process Sr2). Next, a one-pitch movement command is sent to the NC machine tool 11 (Process St3). In addition, the tool 15 mounted on the NC machine tool 11 is configured such that the laser distance meter 13 faces the center line position of the tool 15 and the measurement center position of the laser distance meter 13 is set to the lower end position of the tool 15. deep. This can be easily set by using the results measured by the first and second measuring means.
Thereafter, it is confirmed that the movement completion time of the tool 15 has been completed (processing Sr4), and measurement data is taken in by the laser distance meter 13 (processing Sr5). After confirming that the measured data has reached the number of times of sampling (process Sr6), the minimum value within the cutoff value is detected (process Sr8). The cutting shape of the tool 15 is specified by the minimum value L1 (see FIG. 6). After sending the one-pitch movement command to the NC machine tool 11 in the process Sr3, a NULL command is issued to the NC machine tool 11 to stop the movement of the tool 15 (process Sr7).
[0023]
Then, it is determined whether or not the measurement position of the laser distance meter 13 has reached the set height h (step Sr9). If the measured position has not reached the set height, the transmission of NULL is stopped (step Sr10). The process returns to step Sr3, and the tool 15 is further moved by one pitch to perform the next measurement. As a result, the moving distance (z) of the tool 15 and the minimum distance value (L1) from the laser range finder 13 to the tool 15 at the moving position are measured. The cutting contour is specified. Even if the lower end of the tool 15 is hemispherical as shown in FIG. 6 or if there is a defect, the shape can be accurately measured. Further, the diameter of the tool 15 measured by a measuring device such as a micrometer is input from an input means (for example, a keyboard), and the axial center position of the tool 15 is determined from the cutting contour of the tool 15 corresponding to the measured diameter position. Is specified, and the cutting radius or the cutting diameter of the tool 15 is specified, and this becomes the tool diameter calculating means.
These data are input to a CAD / CAM system that sends commands to the NC machine tool 11, and a tool (blade) to be used for a workpiece can be selected to set an appropriate machining procedure of the NC machine tool.
[0024]
The present invention is not limited to the above-described embodiment, and the present invention is applied to modifications of the present invention without departing from the scope of the invention. For example, in the first and second measuring means of the embodiment, in order to increase the accuracy, a rough range is first specified, and then a process for further narrowing the range is performed. All data can be obtained in a single operation by making it finer.
Further, the collection of data performed by the third measuring means may be inserted into the second measuring means.
[0025]
【The invention's effect】
As is clear from the above description, the automatic measuring method of the tool according to claims 1 to 4 moves the tool in a direction substantially orthogonal to the axis thereof while rotating the tool with the NC machine tool. First step of detecting the center line position of the tool viewed from the laser distance meter from the minimum distance value of the laser distance meter, and aligning the measurement center position of the laser distance meter with the center line position of the tool, and then rotating the tool , Moving in the axial direction, and the second step of obtaining the cutting contour of the tool from the relationship between the moving position and the laser distance meter, while looking at the center line position of the tool with the laser distance meter, The cutting profile of the tool can be measured. Therefore, even if the tool is worn or broken, its shape can be measured.
[0026]
In particular, in the method for automatically measuring a tool according to claim 2, the center line position of the tool obtained in the first step is adjusted to the measurement center position of the laser distance meter between the first step and the second step. , An intermediate step of moving the tool in the axial direction using the NC machine tool and measuring the tip position of the tool is provided, and the second step moves the tool based on the tip of the tool measured in the intermediate step. Then, the cutting contour is measured, so that the cutting contour of the tool with higher accuracy can be measured.
In the automatic tool measuring method according to the third aspect, a reference height position of the spindle head on which the tool is mounted is determined in advance by a laser distance meter, and a tool height from the reference height position to the tip end position of the tool is determined. Therefore, the height of the tool with respect to the spindle head can be recognized, and can be used as it is as cutting data.
In the method for automatically measuring a tool according to the fourth aspect, the diameter value (D) of a perfect circular portion at the specific height position of the tool is measured, and the diameter value (D) and the specific height measured by the laser distance meter. Since the axial center position of the tool is specified from the cutting outline at the position, the cutting radius of the tool for each height can be specified.
[0027]
An automatic tool measuring device according to claim 5 is arranged so as to face a tool attached to an NC machine tool, and a laser distance meter for measuring a distance to the tool, and an output value of the laser distance meter as an input. A control device having a tool measurement program including commands for rotation and movement of the tool of the NC machine tool. The tool measurement program moves the tool in a direction substantially orthogonal to the axis of the tool while rotating the tool. First measuring means for specifying the center line position of the tool as viewed from the laser distance meter from the measured values from the laser distance meter, and directing the laser distance meter to the center line position of the tool by the first measuring means. The tool is moved in the axial direction, the second measuring means for detecting the position of the tip of the tool, and the laser distance meter is arranged so as to be directed to the center line position of the tool, and the tool is rotated while rotating the tool. Axial direction So moved, so that a third measuring means for specifying the cut geometry of the tool from the minimum distance value of the laser distance meter, it is possible to automatically measure the cut geometry of the tool. Therefore, by inputting the measured data to the CAD / CAM system connected to the NC machine tool, the shape of the blade used for actual machining can be specified, and more accurate cutting can be performed.
[0028]
In particular, in the tool automatic measuring device according to the present invention, the tool measuring program has a head position measuring means for measuring the reference height position of the spindle head on which the tool is mounted and causing the NC machine tool to recognize the tool. Can be recognized by the NC machine tool.
In the tool automatic measuring device according to the seventh aspect, input means for inputting a diameter of the tool is provided, and the tool measuring program includes a diameter input from the input means and a tool corresponding to the measured diameter position. Since the tool center calculating means for specifying the axis position of the tool from the cutting outer shape and specifying the cutting radius or the cutting diameter of the tool is provided, it is possible to recognize the axis of the tool and the cutting radius at each height position.
In the automatic tool measuring apparatus according to the eighth aspect, the command signal sent from the control device to the NC machine tool includes a rotational speed of the tool, a feed signal in the width direction of the tool, and a feed signal in the axial direction of the tool. Therefore, the NC machine tool can be positively controlled using this to collect data on tools.
[Brief description of the drawings]
FIG. 1 is an explanatory view of an automatic tool measuring device according to an embodiment of the present invention.
FIG. 2 is an operation flowchart of the automatic tool measuring apparatus.
FIG. 3 is an operation flowchart of the automatic tool measuring apparatus.
FIG. 4 is an operation flowchart of the automatic tool measuring apparatus.
FIG. 5 is an explanatory view of the operation of the automatic measuring device for the tool.
FIG. 6 is an explanatory view of the operation of the automatic measuring device for the tool.
[Explanation of symbols]
10: Tool automatic measuring device, 11: NC machine tool, 12: PC, 13: Laser distance meter, 14: Control device for laser distance meter, 15: Tool, 16: Spindle head

Claims (8)

An automatic tool measurement method for measuring a cutting contour of a tool mounted on a spindle head of an NC machine tool by using a laser distance meter fixedly arranged to face the tool,
While the tool is being rotated by the NC machine tool, the tool is moved in a direction substantially perpendicular to the axis of the tool, and the center line of the tool viewed from the laser distance meter from the minimum distance value of the laser distance meter. A first step of detecting a position;
Align the measurement center position of the laser range finder with the center line position of the tool, and then move the tool in the axial direction while rotating the tool.From the relationship between the movement position and the laser range finder, the tool A second step of obtaining a cutting contour of the tool. 2. The method for automatically measuring a tool according to claim 1, wherein a center line position of the tool obtained in the first step is adjusted to a measurement center position of the laser distance meter between the first step and the second step. In the state, an intermediate step of measuring the tip position of the tool by moving the tool in the axial direction using the NC machine tool is provided, and the second step is the tip of the tool measured in the intermediate step. An automatic measuring method of the tool, wherein the cutting contour is measured by moving the tool with reference to 3. The automatic measuring method of a tool according to claim 2, wherein a reference height position of the spindle head on which the tool is mounted is determined in advance by the laser distance meter, and a tool height from the reference height position to a tip position of the tool is determined. An automatic method for measuring a tool, characterized in that the tool is measured. The method for automatically measuring a tool according to any one of claims 1 to 3, wherein a diameter value (D) of a perfect circle portion at a specific height position of the tool is measured, and the diameter value (D) and the laser are measured. A method for automatically measuring a tool, comprising identifying an axial center position of the tool from a cutting contour at a specific height position measured by a distance meter. An automatic tool measuring apparatus provided to be attached to an NC machine tool and measuring a cutting contour of a tool attached to the NC machine tool,
A laser distance meter arranged to face a tool attached to the NC machine tool and measuring a distance to the tool;
A control device having a tool measurement program that includes an output value of the laser distance meter as input, and includes a command for rotation and movement of the tool of the NC machine tool;
The tool measurement program is to move the tool in a direction substantially perpendicular to the axis of the tool while rotating, and to obtain a center line of the tool as viewed from the laser distance meter from a measurement value from the laser distance meter. First measuring means for specifying a position;
A second measuring means for arranging the laser distance meter so as to be directed to a center line position of the tool by the first measuring means, moving the tool in an axial direction, and detecting a tip position of the tool; When,
The laser distance meter is arranged so as to be directed to the center line position of the tool, and the tool is moved in the axial direction thereof while rotating, so that the cutting contour of the tool is specified from the minimum distance value of the laser distance meter. An automatic tool measuring apparatus comprising: a third measuring means. 6. The automatic tool measuring apparatus according to claim 5, wherein the tool measuring program includes a head position measuring unit that measures a reference height position of a spindle head on which the tool is mounted and causes the NC machine tool to recognize the position. Automatic tool measuring device. The tool automatic measuring device according to any one of claims 5 and 6, further comprising: input means for inputting a diameter of the tool, wherein the tool measuring program includes: a diameter input from the input means; A tool diameter calculating means for specifying the axial center position of the tool from the cutting outer shape of the tool corresponding to the measured diameter position, and including a tool radius calculating means for specifying a cutting radius or a cutting diameter of the tool. Automatic measuring device. The tool automatic measurement device according to any one of claims 5 to 7, wherein a command signal sent from the control device to the NC machine tool includes a rotation number of the tool, a feed signal in a width direction of the tool, and An automatic tool measuring device having an axial feed signal of the tool.

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