JP2010052053A - Method and device for measuring cutting edge of tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically measure all of a plurality of cutting edges. <P>SOLUTION: The lengths of a plurality of cutting edges 5 of a tool 3 attached to a main spindle 2 of a machine tool and fixed at predetermined intervals in the circumferential direction are measured one after another. The tool 3 is rotated at a predetermined angle by an indexing angle calculating means 18 of the main spindle 2 to index a cutting edge position and is opposed to a touch sensor 8, then each cutting edge 5 is brought into contact with the touch sensor 8 and thereby the lengths of the cutting edges are measured one after another. A cutting edge length calculating means 20 calculates the largest height difference among measured lengths of respective cutting edges 5, and a height difference determination means 23 determines whether the maximum value of the height difference of cutting edge lengths is larger than a predetermined allowance or not. When the height difference determination means 23 determines that the maximum value of the height difference of cutting edge lengths is larger than the allowance, since the swing of the cutting edge 5 is large, an abnormal stop means 25 stops cutting, and when the maximum value of the height difference of cutting edge lengths is within the allowance, the swing is determined to be within a normal range to perform cutting. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a tool cutting edge measuring method and a measuring apparatus for automatically measuring the cutting edge lengths of a plurality of cutting edges of a tool mounted on a spindle in a machine tool.

2. Description of the Related Art Conventionally, for a machine tool such as a machining center, for example, a measuring method or apparatus for automatically measuring the cutting blade lengths of a plurality of cutting blades provided on a tool mounted on a spindle is known. As such a measuring method and apparatus for cutting edge length, there are those described in Patent Documents 1 and 2.
For example, in a cutting tool in which a plurality of cutting blades are mounted on the outer periphery of the tip of the tool body, such as a milling cutter or an end mill, as a tool of a machine tool, when a touch type fixed sensor is provided as a sensor, the fixed sensor Is often installed in the vicinity of the end of the maximum swing diameter of the workpiece adjacent to the end of the movable stroke of the tool and adjacent to the pallet.

In this case, since the tip edge of the cutting edge of the tool is brought into contact with the fixed sensor by moving in the X, Y, and Z axis directions without rotating the spindle, the cutting edges of all the cutting edges mounted on the tool body are brought into contact with each other. It is difficult to measure the cutting edge length.
In addition, when the sensor is an optical sensor using laser light, the cutting edge length can be measured only for the cutting edge that protrudes to the outermost side among a plurality of cutting edges because the tool is rotated by the spindle to measure the cutting edge length. is there.
JP 2007-245342 A Japanese Patent No. 3421562

However, the above-described cutting blade measuring method and measuring apparatus have a drawback that it is impossible to measure all of the plurality of cutting blades provided on the outer peripheral portion of the tip of the tool.
Further, not only the above-described measuring method and measuring device of the cutting blade, but generally when measuring the cutting blade length of the cutting blade provided on the tool, the cutting blade length is mistaken due to chips or dust adhering to the cutting edge by cutting. Sometimes measured.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a cutting edge measuring method and a measuring apparatus for a tool that can automatically measure a plurality of cutting edges.
Another object of the present invention is to provide a cutting edge measuring method and a measuring apparatus for a tool capable of measuring all cutting edges more accurately without erroneous detection.

  The tool cutting edge measurement method according to the present invention is a tool cutting edge measurement method in which the cutting edge length of a tool mounted on a spindle of a machine tool and fixed with a plurality of cutting edges in the circumferential direction is measured. Rotating a predetermined angle, indexing the cutting edge position, bringing each cutting edge into contact with the sensor and measuring the cutting edge length sequentially, and calculating the largest difference in height of the measured cutting edges And a step of determining whether or not the maximum value of the height difference (runout) of the cutting edge length is equal to or larger than a predetermined allowable value, and if the maximum value of the height difference of the cutting edge length is equal to or larger than the allowable value, cutting is performed. It is characterized by stopping or changing tools.

  A tool cutting edge measuring apparatus according to the present invention is a tool cutting edge measuring apparatus mounted on a spindle of a machine tool and measuring the cutting edge length of a tool having a plurality of cutting edges fixed in a circumferential direction. A spindle indexing angle calculating means for sequentially indexing any of a plurality of cutting edges by rotating a predetermined angle, a sensor for measuring the cutting edge length of the cutting edge at the position indexed by the indexing angle calculating means, and measurement A cutting edge length calculating means for calculating the maximum height difference (runout) of the plurality of cutting edges, a determination means for determining whether or not the maximum height difference of the cutting edge length is equal to or greater than a predetermined allowable value, When the maximum height difference of the cutting edge length is not less than the allowable value, the cutting is stopped or the tool is changed.

  According to the cutting edge measuring method and measuring apparatus of the tool according to the present invention, the spindle on which the tool is mounted is rotated by the indexing angle between the cutting edges of the tool, and each cutting edge is indexed to a position facing the sensor. The cutting edge length of the cutting edge is sequentially measured by a sensor, and the maximum height difference (runout) of the cutting edge length is calculated from the measured value of the cutting edge length of each cutting edge. Then, it is determined whether or not the maximum height difference is equal to or larger than a preset allowable value. If the maximum height difference is equal to or larger than the allowable value, the cutting is stopped or the tool is changed. Therefore, if the maximum height difference (runout) of multiple cutting edges of the tool is greater than the allowable value, this can be detected, and deterioration of the machined surface roughness can be prevented by stopping cutting or replacing the tool. And a stable surface can be obtained.

  The tool cutting edge measurement method according to the present invention is a tool cutting edge measurement which is mounted on a spindle of a machine tool and measures the cutting blade length of a tool having a plurality of cutting blades fixed in the circumferential direction before and after cutting. In the method, before and after cutting, a step of rotating the tool by a predetermined angle to determine the position of the cutting edge and bringing each cutting edge into contact with a sensor to sequentially measure the cutting edge length, and a plurality of measured values before and after cutting The difference between the step of calculating the largest cutting edge length (W, H) among the cutting edges and the largest cutting edge length (H) calculated after cutting and the largest cutting edge length (W) calculated before cutting is A step of determining whether or not a predetermined abnormality determination value (E) or more, and a step of discharging coolant or air to at least the cutting edge when the difference in cutting edge length is equal to or more than the abnormality determination value (E); And a step of measuring again the cutting edge length of the cutting edge after discharging coolant or air. And wherein the door.

  A tool cutting edge measuring apparatus according to the present invention is mounted on a main spindle of a machine tool, and measures the cutting edge length of a tool in which a plurality of cutting edges are fixed in a circumferential direction before and after cutting. In the detecting device, the index angle calculating means of the spindle that sequentially rotates the tool by a predetermined angle and calculates the index angle of the plurality of cutting edges, and the cutting edge length of the cutting edge at the position indexed by the index angle calculating means The difference between the sensor to be measured and the largest cutting edge length (H) of the cutting edges of the plurality of cutting edges measured after cutting and the largest cutting edge length (W) of the cutting edge measured before cutting is preset. A discriminating means for discriminating whether or not the abnormality discriminating value (E) is greater than or equal to the maximum cutting edge length (H) of the cutting edge measured after cutting and the largest cutting edge length (W) of the cutting edge measured before cutting Is equal to or greater than the abnormality determination value (E), at least the cooling blade is cooled by the first nozzle. And a discharge control means for discharging the object or air, characterized in that so as to measure the cutting length of each cutting edge of the tool after the coolant or air discharge again.

  According to the method and apparatus for measuring a cutting edge of a tool according to the present invention, before and after cutting a workpiece, the spindle on which the tool is mounted is rotated by an indexing angle between adjacent cutting edges of the tool, and each cutting edge is opposed to a sensor. The position is indexed, the cutting edge length of each cutting edge is measured with a sensor, and the largest cutting edge length (W, H) is calculated from the measured value of the cutting edge length of each cutting edge. If the maximum cutting edge length difference (| H−W |) before and after the cutting is equal to or greater than the abnormality determination value (E), foreign matter such as chips and dust adheres to the tip of the cutting edge by cutting. In some cases, the cutting edge before cutting or the maximum cutting edge length of the cutting edge may be missing.For this reason, remove foreign matter when foreign matter is attached by at least discharging coolant or air to the cutting edge. it can. Thereafter, by measuring the cutting edge length of the cutting edge again, it is possible to measure the cutting edge length with higher accuracy, and to detect the chipping of the cutting edge.

Further, in the method for measuring the cutting edge of a tool according to the present invention, the difference between the largest cutting edge length (H) of each cutting edge measured again and the largest cutting edge length (W) calculated before cutting is obtained. If it is equal to or greater than a predetermined abnormality determination value (E), cutting may be stopped or the tool may be changed.
When the difference between the largest cutting edge length (H) of the cutting edge measured again and the largest cutting edge length (W) calculated before cutting is equal to or greater than a predetermined abnormality determination value (E), the cutting edge The cutting is stopped or the tool is changed because the tool is broken or the wear amount is large.
Further, the difference between the largest cutting edge length (H) of each cutting edge measured again and the largest cutting edge length (W) calculated before cutting is less than a predetermined abnormality determination value (E). In some cases, the step of calculating the largest height difference (runout) of the measured cutting edge lengths of the plurality of cutting edges and whether or not the maximum value of the height difference of the cutting edge lengths is equal to or greater than a predetermined allowable value. A step of discriminating, and when the maximum value of the height difference of the cutting edge length is equal to or larger than an allowable value, the cutting may be stopped or the tool may be changed.
Thereby, the maximum height difference, that is, the deflection of the cutting edge length is calculated from the measured value of the cutting edge length of each cutting edge. Then, it is determined whether or not the maximum height difference is equal to or greater than a preset allowable value. If the maximum height difference is equal to or greater than the allowable value, the cutting surface is stopped or the tool is replaced to prevent deterioration of the machined surface roughness. A stable machined surface can be obtained.

The cutting edge measuring method and apparatus of the tool according to the present invention can detect the chip height of the cutting edge such as chipping or the large wear of the cutting edge by calculating the maximum height difference of the cutting edge of the cutting edge in the tool, that is, the deflection. . As a result, it is possible to prevent deterioration of the machined surface roughness due to uneven cutting edges and large runout, and a machined surface with stable surface roughness can be obtained. Moreover, since the most protruding position becomes the tool length by measuring all the cutting edge lengths of the tool, a stable machining dimension can be obtained.
In addition, the method and apparatus for measuring a cutting edge of a tool according to the present invention provides coolant or air when the difference between the largest cutting edge length after cutting and the largest cutting edge length before cutting is equal to or greater than a preset abnormality determination value. By discharging at least to the cutting blade, foreign matters such as chips and dust adhering to the cutting blade can be removed. Then, by measuring the cutting edge length again after that, the false detection can be reduced, the cutting edge length can be detected more accurately, and the machined surface roughness can be stabilized.

Hereinafter, a cutting edge measuring apparatus for a tool in a machine tool according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a configuration diagram of a main part of a cutting edge measuring apparatus according to an embodiment of the present invention, FIG. 2 is a plan view showing a positional relationship between a tool mounted on a spindle and a touch sensor, and FIG. 3 is a view in the direction of arrow A in FIG. FIG. 4 is a flowchart showing a measuring method of each cutting edge of the tool, and FIG. 5 is a flowchart showing a measuring method of each cutting edge of the tool after cutting.
In the tool cutting edge measuring apparatus 1 shown in FIGS. 1 to 3, a spindle 2 held by a numerical control (NC) machine tool is rotatable around a central axis O by a drive motor (not shown). The main shaft 2 is movable in the X-axis-Y-axis-Z-axis directions as shown in FIG. As the cutting tool 3 mounted on the main shaft 2, for example, a milling cutter or an end mill is mounted. As shown in FIG. 1, a plurality of cutting blades 5 are mounted at predetermined intervals on the outer periphery of the tip of a substantially cylindrical tool body 4.

Further, as shown in FIGS. 2 and 3, on the outer peripheral side of the pallet 7 on which the work is placed and fixed, a touch sensor as a fixed sensor is provided at an end portion of the maximum turning radius D1 of the work not shown around the central axis O1. 8 is attached to the bracket 9. The touch sensor 8 detects and measures the cutting edge length from the reference position of the spindle 2 to the contact surface 8a of the touch sensor 8 by bringing the tip of each cutting blade 5 of the tool 3 into contact with the contact surface 8a. It will be. The workpiece is attached to the pallet 7 via a jig (not shown) and is subjected to cutting. Therefore, even if the pallet 7 is turned, a work, a jig or the like does not interfere with the touch sensor 8.
Further, in FIG. 1, in the vicinity of the touch sensor 8, a first nozzle that discharges coolant including coolant liquid such as water or oil, air blow or the like to the contact surface 8 a of the cutting blade 5 to be measured and the touch sensor 8. 10A is provided. The first nozzle 10 </ b> A is connected to a supply source 12 that supplies a coolant or air via a tube 11. Foreign matter such as chips and dust adhering to the cutting edge such as the cutting blade 5 can be blown off by the coolant or air discharged from the first nozzle 10A.
The bracket 9 is provided with a second nozzle 10B that discharges air blow (or coolant liquid) in order to remove chips and other foreign matters adhering to the contact surface 8a of the touch sensor 8.

1 and 2 show a measurement control device for measuring the cutting edge length of each cutting edge by sequentially determining the position and indexing angle of each cutting edge 5 attached to the tool 3 by the rotation and movement of the spindle 2. 13 is provided.
In this measurement control device 13, the number n of tools 3, the index angle θ between the cutting edges 5 and 5 adjacent to the center line O of the spindle 2, and the data measured in advance for each tool 3 are set. The maximum discriminating value E of the cutting edge length of the cutting edge 5 and the maximum permissible value (height difference permissible value F) of the cutting edge length of each cutting edge 5 in the tool 3 and the instruction signal And the like, and an operation control means 15 for operating and controlling the measurement of the cutting edge 5 by the spindle 2 and the touch sensor 8 based on an instruction input to the input means 14.

The measurement control device 13 operates when the spindle index angle calculation means 18 for indexing the plurality of cutting blades 5 of the tool 3 mounted on the spindle 2 and the measurement of the cutting edge length of the cutting blade 5 is performed again. Discharge control means 19 is provided to discharge coolant or air from the first nozzle 10A and the second nozzle 10B to clean the cutting edge 5 to be measured and the contact surface 8a of the touch sensor 8 in accordance with a signal from the control means 15. It has been.
The spindle index angle calculation means 18 calculates the spindle 2 from the data of the number n of tools 3 input from the input means 14 and the angle θ between the cutting edges 5 and 5 adjacent to the spindle center line O. Are sequentially rotated by a predetermined angle θ (referred to as an index angle) so that the respective cutting blades 5 are indexed so as to reach a position facing the contact surface 8a of the touch sensor 8 and controlled for rotation.

Further, a cutting edge length calculating means for calculating the cutting edge length of each cutting edge 5 of the tool 3 measured by the touch sensor 8 and calculating the longest cutting edge length W, H of each cutting edge 5 measured before and after the workpiece cutting. 20 and a memory 21 that stores the cutting edge length of each cutting edge 5 before cutting and registers (stores) the cutting edge 5 having the longest cutting edge length calculated by the cutting edge length calculation means 20 as the tool length correction value W. In addition, it is determined whether or not the absolute value of the difference between the longest cutting edge length H of each cutting edge 5 of the tool 3 and the tool length correction value W after the workpiece cutting measured by the touch sensor 8 is equal to or greater than the abnormality determination value E. The discriminating means 22 and the height difference discriminating means 23 for discriminating whether or not the maximum height difference (runout) of the cutting edge length of each cutting edge 5 in the tool 3 is equal to or higher than the allowable height difference F are provided.
In the determination means 22, when the absolute value of the difference between the longest cutting edge length H and the tool length correction value W is equal to or greater than the abnormality determination value E, a signal is output to the operation control means 15. The operation control means 15 confirms that the remeasurement has not been performed, and outputs a remeasurement signal to the spindle index angle calculating means 18, the discharge control means 19, and the cutting edge length calculating means 20. Yes.

When the position of the cutting edge 5 is determined by the spindle index angle calculation means 18, an output signal is input to the cutting edge length calculation means 20, and the cutting edge from the reference position of the spindle 2 to the tip of the cutting edge 5. The length is measured by the touch sensor 8.
When the difference between the longest cutting edge length H and the tool length correction value W is equal to or greater than the abnormality determination value E, a drive signal is output to the discharge control means 19 in the operation control means 15. When it is determined that the abnormality determination value is equal to or greater than E, a signal is output to the abnormality stopping means 25 and the operation of the machine tool 1 is stopped. Further, the abnormal stop means 25 stops the operation of the machine tool even when the height difference discriminating means 23 determines that the maximum height difference of the cutting edge lengths of the respective cutting edges 5 is not less than the allowable height difference F.
In addition, it may replace with the abnormal stop means 25 and you may make it perform spare tool replacement | exchange.

The tool length cutting edge measuring apparatus 1 in the machine tool according to the present embodiment has the above-described configuration. Next, a method for measuring the cutting edge of the tool 3 will be described with reference to flowcharts shown in FIGS.
First, a method for measuring the cutting edge attached to the tool 3 will be described with reference to FIG.
In the tool cutting edge measuring apparatus 1 in a machine tool, a workpiece (not shown) is first fixed to a predetermined position of the pallet 7 with a jig, and a mill cutter, for example, is mounted on the spindle 2 as a tool 3 for cutting the workpiece. Then, before cutting, the number n of blades of the tool 3, the index angle θ, the allowable height difference F, and the like are input to the measurement control device 13 by the input means 14 (step 101).
The index angle θa for positioning the first cutting edge 5 on the contact surface 8a of the touch sensor 8 by the index angle calculation means 18 of the spindle with respect to the reference positions of the spindle 2 and the tool 3 determined in advance is set. Then, the main shaft 2 is moved by predetermined distances Y1 and X1 in the Y-axis and X-axis directions, and the main shaft 2 is brought to a position facing the contact surface 8a of the touch sensor 8. At this position, the tip of the cutting edge 5 is brought into contact with the contact surface by rotating the spindle 2 by the index angle θ and moving the cutting edge 5 to be measured facing the touch sensor 8 by a predetermined distance Z1 in the Z-axis direction. 8a is contacted (step 103).
In this state, the distance from the reference position of the spindle 2 to the tip of the cutting edge 5, that is, the contact surface 8a of the touch sensor 8 is measured by the cutting edge length calculating means 20 (step 104) and stored in the memory 21 as the cutting edge length. (Step 105), and the number of measured cutting blades 5 is counted (Steps 106 and 107).

Next, the cutting blade 5 of the tool 3 is separated from the touch sensor 8 by a predetermined distance in the Z-axis direction, and the indexing angle θ of the next cutting blade 5 from the cutting blade 5 first measured by the spindle indexing angle calculating means 18. And the operations of steps 102 to 107 described above are repeatedly executed, such as rotating the spindle 2 by the index angle θ. When the measured number of cutting edges 5 reaches the set number of cutting edges n, the height difference discriminating means 23 sequentially calculates the height differences of the cutting edge lengths of the cutting edges 5 of the tool 3 to obtain the maximum height difference J (cutting height). The deflection of the blade 5 is calculated (step 108).
When the height difference allowable value F is input in relation to the maximum height difference J (runout of the cutting edge 5) of the plurality of cutting edges 5 of the tool 3 (step 109), the measured maximum height difference J is high or low. It is determined whether or not the difference is greater than the allowable value F (step 110). If the measured maximum height difference J is greater than or equal to the allowable height difference value, it is determined that the vibration between the plurality of cutting blades 5 is too large and abnormal, and the machine tool is stopped by the abnormality stopping means 25 (step 111). .
When the maximum height difference J is less than the allowable height difference F, it is assumed that the deflection of the plurality of cutting edges 5 is within the allowable range, and the measured value with the highest cutting edge length of the cutting edges 5 is determined as the tool length correction amount W. Is registered (stored) as (step 112). Then, the measurement is finished and the workpiece is cut.
In step 101, when the number n of blades of the tool 3 and the spindle index angle θ are not input, it is recognized that the tool 3 is a single blade tool such as a drill or a tap, and the cutting by the touch sensor 8 is performed. The cutting edge length of the blade 5 is measured (step 113), and this measured value is registered (stored) as the tool length correction amount W (step 114).

As described above, according to the cutting edge measuring apparatus 1 and the measuring method for a tool in the machine tool according to the present embodiment, even when the tool 3 attached to the spindle 2 is provided with a plurality of cutting edges 5, the index angle of the spindle 2 is determined. By rotating by θ and measuring the cutting edge length sequentially with the touch sensor 8, it is possible to measure all the cutting edge lengths of each cutting edge 5 and to determine whether the deflection of the plurality of cutting edges 5 is abnormal or normal.
In addition, the cutting blade length of each cutting blade 5 measured here is a thing before the cutting process of a workpiece | work.

Next, a method for measuring the cutting edge of a tool using the cutting edge measuring apparatus 1 for a tool, which performs cutting edge measurement by determining whether or not there is an abnormality such as breakage in the cutting edge 5 after cutting a workpiece with the tool 3, is shown in FIG. Will be described.
After cutting the workpiece with the tool 3, the cutting edge length of each cutting edge 5 is measured again in order to detect the presence or absence of abnormality such as breakage of the cutting edge 5.
First, in the flowchart shown in FIG. 5, steps 201 to 207 are the same as steps 101 to 107 in the cutting edge measuring method of the tool before cutting shown in FIG. 4, and the indexing of the cutting edge 5 and the measurement of the cutting edge length b are performed. Do it sequentially.
Then, the cutting edge length H of the cutting edge 5 that protrudes most among the measured values of each cutting edge 5 of the tool 3 measured by the touch sensor 8 in the cutting edge length calculation means 20 is calculated (step 208) and registered in advance. In the discriminating means 22, the difference with the tool length correction value W, which is the longest cutting edge length before cutting, is calculated as an absolute value by the following expression | W−H | <E, and is this difference smaller than the abnormality discriminating value E? It is determined whether or not (step 209). Here, the cutting edge 5 with the longest cutting edge length W measured before cutting and the cutting edge 5 with the longest cutting edge length H measured after cutting are not necessarily the same cutting edge 5. It may fluctuate depending on the wear amount of each cutting edge 5 due to cutting or the presence or absence of breakage such as chipping or chipping.

If the difference | W−H | in the determination result by the determination means 22 is equal to or greater than the abnormality determination value E, there is a possibility that the cutting blade 5 has a large breakage or the like. However, even in this case, there is a case where chips, dust, or the like is attached to the tip of the cutting blade 5 and the cutting blade length H is increased, so that the measurement is immediately performed without determining that it is abnormal.
That is, a remeasurement signal is output from the discriminating means 22 to the operation control means 15 (step 210), and it is confirmed that the operation control means 15 has not yet remeasured the cutting edge 5 of the tool 3 (step 211). ), And outputs a signal to the discharge control means 19. In the discharge control means 19, the first and second nozzles 10 </ b> A and 10 </ b> B discharge coolant liquid or air blow to each cutting blade 5 of the tool 3 and the contact surface 8 a of the touch sensor 8 to remove foreign matters such as chips and dust. If they are attached to 5, these foreign matters are blown away. At that time, the spindle 2 is intermittently rotated at every indexing angle θ to spray coolant liquid or air to each cutting edge 5 (step 212).
Then, after completion of spraying of the coolant or air, the process returns to step 201 as completion of preparation for remeasurement, and the index angle calculating means 18 calculates the spindle index angle θ for each cutting edge 5.

In this way, the cutting edge length of each cutting edge 5 of the tool 3 is measured again in steps 201 to 207, the longest cutting edge length H of each cutting edge 5 is calculated (step 208), and the discrimination means 22 It is determined again whether or not the cutting edge length difference | W−H | is equal to or greater than the abnormality determination value E (step 209).
Here, if the difference | W−H | in the cutting edge length is equal to or greater than the abnormality determination value E, the measurement is already performed again (step 211). Or the tool 3 is replaced with a spare one.
When the difference in cutting edge length | W−H | is less than the abnormality determination value E, it is recognized that the deflection of each cutting edge 5 is within the normal range, and steps 108 to 110 in the flowchart of FIG. Similarly, the height difference discriminating means 23 sequentially calculates the height difference of the cutting edge length of each cutting edge 5 to calculate the maximum height difference J (runout of the cutting edge 5) (step 215). If the allowable height difference F is input in relation to the maximum height difference J (step 216), it is determined whether or not the maximum height difference J is equal to or greater than the allowable height difference F (step 217). If the maximum height difference J is greater than or equal to the allowable height difference value, it is determined that there is an abnormality, and the machine tool is stopped by the abnormality stopping means 25 (step 214). Alternatively, the tool 3 is replaced.
When the maximum height difference J is less than the height difference allowable value F, it is determined that the runout is within the allowable range, and the cutting process is terminated.

In step 201, if the number of blades n of the tool 3 and the spindle index angle θ are not input, it is recognized that the tool 3 is a tool 3 to which a single blade 5 such as a drill or a tap is attached. Then, the cutting edge length H of the cutting edge 5 is measured by the touch sensor 8 (step 218), and the determination means 22 determines whether or not the difference in cutting edge length | W−H | is equal to or greater than the abnormality determination value E. (Step 219).
If the cutting edge length difference | W−H | is greater than or equal to the abnormality determination value E, re-measurement is performed in step 210. If the cutting edge length difference | W−H | is less than the abnormality determination value E, The cutting edge 5 is terminated as being within the normal range.

As described above, according to the cutting edge measuring apparatus 1 and the measuring method for a tool according to the present embodiment, the cutting edge lengths of all the cutting edges 5 are measured by the touch sensor 8 to calculate the cutting edge 5 having the longest cutting edge length. it can. Further, it is possible to determine whether the cutting edge 5 of the cutting tool 5 after the cutting is in an allowable range or not by the determining means 22 and to prevent deterioration of the machined surface roughness due to large cutting edge 5 deflection. .
Further, when discriminating runout or chipping of the cutting edge 5 or the like, if the difference in the maximum cutting edge length before and after cutting | W−H | exceeds the allowable range consisting of the abnormality discrimination value E, coolant liquid or air is discharged. Since foreign matters such as chips and dust adhering to the cutting blade 5 are removed and remeasured, erroneous detection when foreign matters such as chips and dust adhere to the cutting blade 5 can be prevented.
Further, when the cutting blade 5 is a single blade, such as a boring bar, drill, or tap, the spindle can be used even when the contact surface 8a of the touch sensor 8 cannot be contacted or measured depending on the direction of the cutting blade 5. By rotating 2 and determining the position of the cutting edge 5, it is possible to measure the cutting edge length and detect abnormalities such as breakage of the cutting edge 5.

In the tool measuring device 1 and the measuring method according to the above-described embodiment, the cutting edge length is measured and the cutting edge 5 is lost even in the case of a boring bar, drill, or tap in which the number of cutting edges 5 of the tool 3 is one. The cutting edge measuring method and cutting edge measuring method of the tool 3 having only one cutting edge 5 are not included in the cutting edge measuring method shown in FIGS. Also good.
In the above-described embodiment, the first and second nozzles 10 </ b> A and 10 </ b> B can remove chips and dust adhering to each cutting blade 5 and the contact surface 8 a of the touch sensor 8 by discharging coolant or air. However, the coolant or air may be discharged only to the cutting edge 5 by the first nozzle 10A. If chips, dust, or the like is attached to the touch sensor 8, an error is added to all the cutting edges 5, so that abnormalities such as chipping of the specific cutting edge 5 and large wear can be detected.

It is a figure which shows the principal part structure of the cutting edge measuring apparatus of the tool in the machine tool by embodiment of this invention. FIG. 2 is a main part plan view showing a main shaft and a sensor provided at a position close to a workpiece placing pallet in the cutting edge measuring apparatus shown in FIG. 1. It is an A direction arrow directional view of the pallet and sensor in the cutting edge measuring apparatus of the tool shown in FIG. It is a flowchart which shows the cutting edge measuring method of the tool before cutting. It is a flowchart which shows the cutting edge measuring method of a tool after cutting, the foreign material removal method, etc.

Explanation of symbols

1 Cutting edge measuring device for tools
2 Spindle
3 Tool 5 Cutting edge 8 Sensor 8a Contact surface 10A First nozzle 10B Second nozzle 13 Measurement control device 15 Operation control means 18 Indexing angle calculation means 19 Discharge control means 20 Cutting edge calculation means 22 Discrimination means 23 Height difference discrimination means 25 Abnormal stop means

Claims (6)

In the method of measuring the cutting edge of a tool that is mounted on the spindle of a machine tool and measures the cutting edge length of a tool with a plurality of cutting edges fixed in the circumferential direction,
Rotating the tool a predetermined angle to determine the cutting edge position and contacting each cutting edge to a sensor to sequentially measure the cutting edge length;
Calculating the largest height difference of the measured cutting edge lengths of the plurality of cutting edges;
Determining whether a maximum value of the height difference of the cutting edge length is equal to or greater than a predetermined allowable value;
The method for measuring a cutting edge of a tool, wherein the cutting is stopped or the tool is changed when the maximum value of the height difference of the cutting edge length is equal to or greater than the allowable value. In a tool cutting edge measuring apparatus that is mounted on a spindle of a machine tool and measures the cutting edge length of a tool having a plurality of cutting edges fixed in a circumferential direction.
An index angle calculating means for rotating the main shaft by a predetermined angle and sequentially indexing any of a plurality of cutting blades;
A sensor for measuring the cutting edge length of the cutting blade at the position indexed by the indexing angle calculating means;
Cutting edge length calculating means for calculating the maximum height difference of the measured cutting edge lengths of the plurality of cutting edges;
Discriminating means for discriminating whether or not the maximum height difference of the cutting edge length is equal to or greater than a predetermined allowable value;
A cutting edge measuring apparatus for a tool, wherein cutting is stopped or the tool is changed when the maximum height difference of the cutting edge length is equal to or greater than the allowable value. In the method of measuring the cutting edge of a tool that is mounted on the spindle of a machine tool and measures the cutting edge length of a tool in which a plurality of cutting edges are fixed in the circumferential direction before and after cutting,
Before and after cutting, rotating the tool by a predetermined angle to determine the position of the cutting edge, bringing each cutting edge into contact with a sensor and sequentially measuring the cutting edge length;
Before and after cutting, calculating the largest cutting edge length among the plurality of cutting edges measured,
Determining whether the difference between the largest cutting edge length calculated after cutting and the largest cutting edge length calculated before cutting is equal to or greater than a predetermined abnormality determination value;
A step of discharging coolant or air to at least the cutting edge when the difference in cutting edge length is equal to or greater than an abnormality determination value;
And a step of measuring again the cutting edge length of the cutting blade after discharging the coolant or air.   If the difference between the cutting edge length of each cutting edge measured again and the largest cutting edge length calculated before cutting is equal to or greater than a predetermined abnormality determination value, the cutting is stopped or the tool The method for measuring a cutting edge of a tool according to claim 3, wherein the cutting edge is exchanged. When the difference between the cutting edge length of each cutting edge measured again and the largest cutting edge length calculated before cutting is less than a predetermined abnormality determination value, a plurality of measured Calculating the largest height difference of the cutting edge length of the cutting edge;
Determining whether the maximum value of the height difference of the cutting edge length is equal to or greater than a predetermined allowable value, and when the maximum value of the height difference of the cutting edge length is equal to or greater than the allowable value, cutting 4. The method for measuring a cutting edge of a tool according to claim 3, wherein the tool is stopped or the tool is changed. In a tool cutting edge measuring device that is mounted on the spindle of a machine tool and measures the cutting edge length of a tool having a plurality of cutting edges fixed in the circumferential direction before and after cutting,
An index angle calculation means for sequentially indexing the index angles of a plurality of cutting blades by rotating the tool by a predetermined angle;
A sensor for measuring the cutting edge length of the cutting edge at the position indexed by the indexing angle calculating means;
It is determined whether or not the difference between the largest cutting edge length of the plurality of cutting edges measured after cutting and the largest cutting edge length measured before cutting is equal to or greater than a preset abnormality determination value. Discrimination means;
If the difference between the largest cutting edge length of the cutting edge measured after the cutting and the largest cutting edge length of the cutting edge measured before the cutting is equal to or greater than the abnormality determination value, at least the first nozzle on the cutting edge A discharge control means for discharging coolant or air by
A cutting edge measuring apparatus for a tool, wherein the cutting edge length of each cutting edge of the tool is measured again after discharging coolant or air.

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