JP2013240842A - Cutting tool state detection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly discriminate a state of a cutting tool, and to improve processing efficiency.SOLUTION: A cutting tool state detection system comprises: a distance measurement means for measuring a distance up to a rotation circumference of a cutting tool having a blade which is attached to a rotating drive part arranged at a machine tool body and extends in a circumferential direction at the rotation of the cutting tool; a distance data accumulation means for accumulating distance data which are measured by the distance measurement means; a distance data comparison means for comparing each distance data which are measured at the different timing and accumulated in the distance data accumulation means; and a cutting tool state discrimination means for discriminating a state of the cutting tool on the basis of a comparison result by the distance data comparison means. The distance data comparison means specifies respective blade portion data portions in which a distance up to a blade arranged at the cutting tool is measured from the respective distance data, and compares the respective blade portion data portions.

Description

  The present invention relates to a cutting tool state detection system, and more particularly to a system for detecting a state of a cutting tool having a blade at a tip mounted on a machine tool.

  In a machine tool such as a drilling machine, a milling machine, or a machining center, a tooling holder that holds a tool is attached to a spindle head portion, and the spindle head portion is rotationally driven to rotate the tool to machine a workpiece. Such a tooling holder can be attached to and detached from the spindle head portion, and the tool can be easily exchanged.

  Here, the structure of a general tooling holder will be described with reference to FIGS. 1 (A) and 1 (B). Note that FIG. 1B is a view of FIG. 1A viewed from below. As shown in FIGS. 1A and 1B, the tooling holder 1 is formed in a shape having a predetermined length. And the tooling holder 1 forms the tool holding part 11 which hold | maintains a tool at one end side, and forms the shank part 13 fixed to the spindle head part 3 of a machine tool main body at the other end side. A flange portion 12 is formed between the tool holding portion 11 and the shank portion 13.

  Here, various tools can be attached to the tip of the tooling holder 1, but in this application, the cutting tool 2 having a plurality of blades 21 is attached. Specifically, the cutting tool 2 is formed in a substantially cylindrical shape, one end is mounted on the tool holding portion 11 of the tooling holder 1, and four blades 21 projecting outward are provided around the other end (side surface). Equipped with two. In addition, the number of the blades 21 with which the cutting tool 2 is equipped is not limited to four.

  And the said shank part 13 is formed in the substantially cone shape so that a diameter may become small toward the edge part of the tooling holder 1. FIG. That is, the outer surface is formed in a taper shape. Corresponding to the shape of the shank portion 13, a tapered holder holding hole 31 is formed in the spindle head portion 3. By holding the shank portion 13 in the holder holding hole 31, when the spindle head portion 3 is driven to rotate, the tooling holder 1 is also rotated, and the cutting tool 2 mounted on the tip portion can be rotated. The structure of the tooling holder is also disclosed in Patent Document 1.

JP 2002-18614 A

  However, in the tooling holder 1 as described above, when the tooling holder 1 is replaced, there is a possibility that foreign matter such as a cutting face enters between the shank portion 13 and the holder holding portion 31 of the spindle head portion 3. is there. For example, as shown in the area A of FIG. 2, when the cutting piece a enters between the shank part 13 and the holder holding part 31, the axis of the tooling holder 1 rotates with respect to the axis of the spindle head part 3. It may shift with respect to the axis. Then, there was a problem that the cutting tool 2 attached to the tip of the tooling holder 1 was decentered, resulting in processing failure. On the other hand, even in the case described above, since the eccentricity of the cutting tool 2 is slight, it is difficult to detect this. As a result, it is difficult to detect an abnormality at the time of attaching the tool at an early stage, and it has to be actually processed, resulting in a waste of time and processing. As a result, there is a problem that it is difficult to improve the efficiency of processing using a machine tool.

  Further, the cutting tool 2 having the blade 21 has a problem that the blade 21 may be damaged due to its life or the like, and if the processing is performed as it is, a processing failure occurs. As described above, it is difficult to detect slight damage to the blade 21, and there is a problem that the efficiency of processing using a machine tool cannot be improved.

  Therefore, an object of the present invention is to quickly determine the state of the cutting tool, which is the above-described problem, and to improve the processing efficiency.

A cutting tool state detection system according to one aspect of the present invention is:
A distance measuring means for measuring a distance to the rotation periphery of the cutting tool having a blade protruding to the periphery, attached to a rotation driving unit provided in the machine tool main body, when rotating the cutting tool;
Distance data storage means for storing distance data measured by the distance measurement means;
Distance data comparison means for comparing the distance data measured at different timings and stored in the distance data storage means;
Cutting tool state determining means for determining the state of the cutting tool based on the comparison result by the distance data comparing means,
The distance data comparison means specifies each blade portion data portion that measures the distance to the blade provided in the cutting tool from each distance data, and compares each blade portion data portion.
The configuration is as follows.

And in the cutting tool state detection system,
The distance measurement means includes an optical measurement unit that measures a distance to the rotation periphery by irradiating predetermined light around the rotation of the cutting tool,
A case that surrounds the distance measuring means and accommodates the distance measuring means;
An opening that exposes the optical measurement unit from the case toward the cutting tool is formed in the case so that the optical measurement unit can measure the distance to the rotation periphery of the cutting tool. Equipped with a movable shutter to open and close
The configuration is as follows.

In the cutting tool state detection system,
The operation state of the machine tool is detected when cutting with the cutting tool and when the measurement is performed to measure the distance to the rotation periphery of the cutting tool, and the optical state is detected during the cutting process. The shutter is closed so that the measurement unit is not exposed to the outside from the inside of the case, and the shutter is movable so that the optical measurement unit is opened from the case to the cutting tool during the measurement. Provided with shutter control means for
The configuration is as follows.

In the cutting tool state detection system,
At least during the cutting process, provided with a gas inflow means for flowing a predetermined gas into the case,
The configuration is as follows.

In the cutting tool state detection system,
Gas spraying means for spraying gas against the cutting tool during the measurement,
The configuration is as follows.

In the cutting tool state detection system,
The cutting tool is provided with a plurality of the blades,
The cutting tool state discriminating means compares each blade portion data portion corresponding to each of the plurality of blades provided in the cutting tool, and calculates a difference in distance to the blade in each blade. Determining the state of the cutting tool based on a value averaged by a number;
The configuration is as follows.

In addition, the cutting tool state detection method according to another embodiment of the present invention,
A distance measuring step of measuring a distance to a rotation periphery of a cutting tool having a blade protruding to the periphery, attached to a rotation driving unit provided in the machine tool body, when the cutting tool is rotated,
A distance data storage step for storing measured distance data, and
A distance data comparison step for comparing each of the distance data measured and accumulated at different timings;
A cutting tool state determination step of determining the state of the cutting tool based on the comparison result in the distance data comparison step,
In the distance data comparison step, each distance data is specified from each of the blade portion data portions that measure the distance to the blade, and each blade portion data portion is compared.
The configuration is as follows.

And in the cutting tool state detection method,
The distance measuring step measures the distance to the rotation periphery by irradiating a predetermined light around the rotation of the cutting tool with an optical measurement unit housed in a case surrounding the periphery,
An opening formed in the case that exposes the optical measurement unit from the inside of the case toward the cutting tool so that the optical measurement unit can measure a distance to the rotation periphery of the cutting tool is provided by a shutter. A shutter control step for controlling opening and closing;
The configuration is as follows.

  By being configured as described above, the present invention can detect an abnormality of a cutting tool quickly and appropriately, and can improve machining efficiency using a machine tool.

It is a figure which shows the attachment state of the tooling holder with which the cutting tool was mounted | worn. It is a figure which shows the attachment state of the tooling holder with which the cutting tool was mounted | worn. It is a figure which shows the structure of a cutting tool state detection system. It is a figure which shows the structure of the distance measuring device with which a cutting tool state detection system is provided. It is a figure which shows the structure of the distance measuring device with which a cutting tool state detection system is provided. It is a figure which shows the structure of the control apparatus with which a cutting tool state detection system is provided. It is a figure which shows the mode of the process of the distance data by the cutting tool state detection system. It is a flowchart which shows operation | movement of the cutting tool state detection system.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. 1 and 2 are diagrams showing the configuration of a cutting tool and a tooling holder. FIG. 3 is a diagram illustrating a configuration of the cutting tool state detection system. 4 to 5 are diagrams showing the configuration of the distance measuring device. FIG. 6 is a diagram illustrating a configuration of the control device. FIG. 7 is an explanatory diagram showing how distance data is processed. FIG. 8 is a flowchart showing the operation of the cutting tool state detection system.

[Constitution]
The cutting tool state detection system in this embodiment is equipped in machine tools such as a drilling machine, a milling machine, and a machining center. Then, the cutting tool state detection system has a vibration of the tooling holder 1 to which the cutting tool 2 attached to the spindle head portion 3 (rotation drive portion) provided in the machine tool main body is driven to rotate, that is, the spindle head portion. 3 and the cutting tool 2 can be used to detect that the axes are shifted. The cutting tool state detection system can be used to detect a defective state such as wear or chipping of the blade 2 of the cutting tool 2 attached to the tooling holder 1.

  Here, the cutting tool 2 attached to the tooling holder 1 in the present embodiment will be described together with the tooling holder 1. First, as shown in FIG. 1 (A) and FIG. 1 (B), the tooling holder 1 is formed in a shape having a predetermined length, and is formed on one end side (the lower portion of FIG. 1 (A)). Has a substantially cylindrical tool holding portion 11 that holds various tools 2 such as the cutting tool 2 at the tip portion (the lower end portion in FIG. 1A). Further, a shank portion 13 fixed to the spindle head portion 3 of the machine tool main body is formed on the other end side of the tooling holder 1 (upper portion in FIG. 1A). The shank portion 13 is formed in a substantially conical shape so that the diameter becomes smaller toward the end portion (upper end portion in FIG. 1A). That is, the outer surface is formed in a taper shape. As described above, the shank portion 13 can be attached to the machine tool body by being held in the tapered holder holding hole 31 formed in the spindle head portion 3. Then, by rotating the spindle head portion 3, the tooling holder 1 is also rotated, and the cutting tool 2 attached to the tip end portion is rotated to perform processing.

  In this embodiment, the cutting tool 2 attached to the tip of the tooling holder 1 has a substantially cylindrical shape, and four blades 21 are provided on the outer peripheral surface of the tip so as to protrude outward. Yes. However, the number of the blades 21 equipped in the cutting tool 2 is not limited to four.

  Here, the configuration of the machine tool 100 to which the tooling holder 1 is mounted and the configuration of the cutting tool state detection system will be described with reference to FIG. In the machine tool 100, the processing table 101 is positioned below the tooling holder 1 mounted on the spindle head unit 3 as described above, that is, on the tip side of the mounted cutting tool 2. The processing table 101 is used to place a workpiece to be processed by the cutting tool 2.

  In addition, the machine tool 100 includes a coolant spraying device 102 that sprays a coolant such as water for cooling the cutting tool 2 to the cutting tool 2 when the cutting tool 2 performs the cutting (see FIG. 3 arrow Y3). While the cutting process is being performed, the cooling liquid spraying device 102 moves so as to spray the cooling liquid in accordance with the operation of the cutting process. The coolant spraying device 102 does not operate when measuring the distance to the rotation periphery of the cutting tool 2 described later, and does not spray coolant.

  Further, a distance sensor unit 4 (distance measuring means) is fixedly provided on the processing table T. The distance sensor unit 4 is mounted on the upper end side of a support column that is fixed to the processing table T and extends upward, and the end of the cutting tool 2 that is mounted on the tooling holder 1, that is, the blade 21 provided on the cutting tool 2. It is located close to the location. The distance sensor unit 4 is not limited to being fixedly mounted on the processing table T.

  The configuration of the distance sensor unit 4 will be described with reference to FIGS. 4 is a cross-sectional view of the distance sensor unit 4 as viewed from the side as shown in FIG. 3, and is a schematic diagram showing the internal configuration of the distance sensor unit 4. FIG. It is the schematic when the side surface of the distance sensor unit 4 is seen from the cutting tool 2 side.

  As shown in the sectional view of FIG. 4, the distance sensor unit 4 includes a case 40 that surrounds the outer periphery, and a distance sensor 41 (optical) that measures the distance to the rotation periphery of the cutting tool 2 inside the case 40. Measurement unit) is housed. The distance sensor 41 includes, for example, an irradiation unit 41a that irradiates a measurement target with laser light, and a reception unit 41b that receives reflected light from the measurement target. From the received reflected light, It is a sensor that measures the distance to the measurement object.

  In the present embodiment, the distance sensor 41 calculates the distance from the position where the distance sensor 41 is located to the rotation periphery equipped with the blade 21 that is the tip of the cutting tool 2. The time is measured (see arrow Y1 in FIG. 3). In particular, in this embodiment, the distance to the outer peripheral surface at the position indicated by the arrow Y2 in FIG. 3, that is, the position where the blade 21 is mounted on the cutting tool 2 is measured. For example, the distance sensor 41 measures the distance to the cutting tool 2 2000 times while the cutting tool 2 rotates once. Therefore, the distance sensor 41 measures the distance data at a time interval that can be measured 2000 times within one rotation according to the rotation speed of the cutting tool 2 described above. Then, the distance sensor 41 sends distance data obtained by measurement to the control device 5. The number of times the distance is measured while the cutting tool 2 rotates once by the distance sensor 41 is not limited to the number described above.

  Further, as shown in FIGS. 4 and 5, the case 40 of the distance sensor unit 4 is cut out in a substantially rectangular shape in the vicinity of the portion where the distance sensor 41 is equipped, and the irradiation constituting the distance sensor 41 is performed. An opening 42 that exposes the portion 41a and the receiving portion 41b to the outside is formed. In addition, a thin plate-like lid member 44 is attached to the inside of the opening 42, and a substantially rectangular second opening 44 a having a size smaller than the opening 42 is formed on the lid member 44. Is formed. The second opening 44 a is disposed at a position where the irradiation unit 41 a and the receiving unit 41 b constituting the distance sensor 41 are exposed to the outside, and the outer periphery of the second opening 44 a is located inside the opening 42. positioned. For this reason, the irradiation part 41a and the receiving part 41b which comprise the distance sensor 41 will be in the state exposed outside from the 2nd opening part 44a and the opening part 42, and the cutting tool 2 located in the outer side of the case 40 of it. The distance to the rotation circumference can be measured.

  Further, the case 40 of the distance sensor unit 4 is provided with a shutter 43 made of a plate-like member in the vicinity of the opening 42 so as to close the opening 42. The shutter 43 is pivotally supported by the case 40 so as to be rotatable by a rotation shaft 43b connected to the rotation drive unit 43a. As a result, as shown in FIGS. 5A and 5B, the shutter 43 that is in a state of closing the opening 42 is closed, and the shutter 43 that is in the state of opening of the opening 42 is open. , Movable.

  As will be described later, the shutter 43 is in a closed state at least during cutting, and functions to prevent the coolant sprayed during the cutting from entering the case 40. Thereby, it can suppress that a cooling fluid adheres to the irradiation part 41a and the receiving part 41b which comprise the distance sensor 41, and can suppress the fall of the measurement precision of an optical distance. In addition, since the size of the second opening 44 a located closer to the distance sensor 41 than the opening 42 is formed smaller, it is possible to further prevent the coolant from entering the case 40. A member having a smaller opening than the second opening 44 a may be separately provided between the lid member 44 and the distance sensor 41.

  In addition, the case 40 of the distance sensor unit 4 is provided with an air inlet 45 (gas inflow means) through which air flows into the case 40. The air inlet 45 is connected to an air supplier 7 (gas inflow means) provided outside the case 40, and the air supplied from the air supplier 7 is transferred from the air inlet 45 to the inside of the case 40. Can be allowed to flow into. The gas flowing into the case 40 is not limited to air, and may be any gas.

  As will be described later, the inflow of air into the case 40 is always performed at least during cutting. Thereby, air is pushed out from the case 40 to the outside, and even if there is a gap between the opening 42 and the shutter 43 described above, it is effective that the coolant enters the case 40. Can be suppressed. In addition, the inflow of air into the case 40 may be performed other than during cutting.

  Further, the case 40 of the distance sensor unit 4 is provided with an air blowing port 46 (gas blowing means) for blowing air toward the cutting tool 2. The air blowing port 46 is connected to an air supply unit 7 (gas blowing unit) provided outside the case 40, and the air supplied from the air supply unit 7 is cut through the air blowing port 46. The tool 2 is sprayed. Specifically, the air blowing port 46 blows air toward a location where the blade 21 of the cutting tool 2 is formed, that is, a rotational outer peripheral location of the cutting tool 2 whose distance is measured by the distance sensor 41 described above. It is equipped with case 40 so that it may be attached. In the example of FIGS. 4 and 5, the air blowing port 46 is provided above the opening 42. However, the air blowing port 46 may be provided at any position of the case 40 or may be provided at a place other than the case 40. Good. Further, the gas blown from the air blowing port 46 is not limited to air, and may be any gas. Furthermore, another device may be provided as the air supply device 7 for supplying air to be blown from the air blowing port 46.

  Note that, as will be described later, air is blown from the air blowing port 46 to the cutting tool 2 when measuring the distance to the cutting tool 2. As a result, the coolant sprayed during the cutting process and adhered to the cutting tool 2 can be blown or dried, and a good distance can be measured by the distance sensor 41.

  Next, the configuration of the control device 5 will be described. First, the control device 5 is a general information processing device including an arithmetic device and a storage device. The control device 5 includes a measurement unit 51, a comparison unit 52, a determination unit 53, a shutter control unit 54, and an air control unit 55. Each of these units 51 to 55 is realized by a predetermined electronic circuit, or is constructed by incorporating a predetermined program into the arithmetic device. In addition, the storage device includes a measurement data storage unit 56 and a reference data storage unit 57. Hereinafter, each configuration will be described in detail.

  First, although not illustrated, the control device 5 receives a cutting command or a distance measurement command from the operator, sets the state of the machine tool itself, and controls its operation. For example, when receiving a cutting command, the cutting tool 2 is brought into a state at the time of cutting, and the cutting tool 2 is rotationally driven to perform cutting and control to spray a coolant. On the other hand, when a distance measurement command is received, the measurement state is entered, and measurement is performed by the measurement unit 51 as will be described later. Note that the control device 5 notifies the measurement unit 51, the shutter control unit 54, the air control unit 55, and the like that it is during cutting or measurement.

  Next, the air control unit 55 will be described. The air control unit 54 controls the air to flow into the air inlet 45 from the air supply machine 7 at least during the cutting process so that the air flows into the case 40. Thereby, it will be in the state where air will be extruded outside from the case 40 at the time of cutting, and it can suppress effectively that a cooling fluid enters the case 40 inside. Note that the air control unit 55 is not limited to the cutting process, and air may flow into the case 40 from the air inlet 45 at all times.

  In addition, the air control unit 55 controls air to flow from the air supply device 7 to the air blowing port 46 and to blow air from the air blowing port 46 to the cutting tool 2 at least during measurement. Thereby, at the time of measurement, the cooling liquid sprayed at the time of cutting and adhering to the cutting tool 2 can be blown off or dried.

  Next, the shutter control unit 54 (shutter control means) will be described. The shutter control unit 54 drives the rotation driving unit 43 a to open the shutter 43 and expose the distance sensor 41 from the opening 42 when it is during measurement. Thereby, as described above, the measurement unit 51 can perform measurement via the distance sensor 41. In addition, the shutter control part 54 drives the rotation drive part 43a, and closes the shutter 43, when the time of measurement is complete | finished. Alternatively, the shutter control unit 54 closes the shutter 43 at least when cutting.

  Next, the measuring unit 51 (distance measuring means) will be described. When a measurement instruction is input and measurement is started, the measurement unit 51 first instructs the machine tool itself to rotate the cutting tool 2 for measurement. Thus, when the cutting tool 2 rotates, the measuring unit 51 controls the operation of the distance sensor 41 described above, irradiates the laser around the rotation of the cutting tool 2 and receives the reflected light, thereby receiving the distance sensor. The distance data composed of the analog signal acquired from 41 is converted into a digital signal (A / D conversion). In addition, the measurement unit 51 sends the A / D converted distance data to the measurement data storage unit 54 (distance data storage unit), and temporarily stores the distance data in the measurement data storage unit 56. That is, the measurement data storage unit 56 has a buffer function for distance data.

  Here, an example of the distance data measured as described above is shown in FIG. In this figure, the vertical axis indicates a voltage value that is a measurement value corresponding to the distance to the rotation periphery of the cutting tool 2, and the horizontal axis indicates the measurement position (movement distance) around the rotation of the cutting tool 2 corresponding to the measurement time. Show. Since the distance sensor 41 measures the voltage value, which is a measured value, as the distance is shorter, FIG. 7 shows that the distance is shorter as the value on the vertical axis is higher.

  And since the cutting tool 2 is provided with the four blades 21 on the outer peripheral surface, the distance data shows four chevron data every time the outer peripheral surface of the cutting tool 2 is measured. That is, the vertex of the first chevron data in FIG. 7A corresponds to the distance to the first blade 21, the vertex of the second chevron data is the second blade 21, and so on. In addition, the distance to the four blades 21 can be measured. Here, since the control device 5 always recognizes the origin in the rotation direction of the cutting tool 2 and controls the rotation of the cutting tool 2, the control device 5 starts from the order of the mountain shape appearing in the distance data measured as described above. Each distance which specified each blade 21 of cutting tool 2 can be measured. In addition, you may calculate the distance to each blade 21 from the distance data measured not only once but multiple times.

  In addition, when the measurement unit 51 receives a command to perform initial registration such as when the cutting tool 2 is first mounted, the measurement unit 51 measures each distance to each blade 21 measured as described above. Are registered in the reference data storage unit 57 as reference position information (reference data) of each blade 21. On the other hand, when the measurement unit 51 simply receives a measurement command and starts measurement, the measurement unit 51 obtains position information (blade portion data portion) corresponding to each distance to each blade 21 measured as described above. The measurement data storage unit 56 temporarily stores the current position information of each blade 21.

  Then, the comparison unit 52 (distance data comparison unit) processes the current position information of each blade 21 accumulated in the measurement data storage unit 54 as described above. Specifically, the reference position information (for example, FIG. 7A) of each blade 21 registered in the reference data storage unit 57 and the current state of the latest blade 21 stored in the measurement data storage unit 56. The position information (for example, FIG. 7B) is read, and the difference between the reference position information and the current position information is calculated for each blade 21. In the example of FIGS. 7A and 7B, the mountain-shaped data positioned in the same order is position information corresponding to the same blade 21, and therefore each blade 21 has a position corresponding to the blade 21. Take the difference in information. Then, the comparison unit 52 passes the calculated difference in position information on each blade 21 to the determination unit 53. In addition, from the difference in the position information calculated as described above, how much the position of each blade 21 has changed from the time of initial registration to the present, that is, whether the tooling holder 1 is eccentric, or either It can be recognized whether the blade 21 is worn or chipped, but this determination is performed by the following determination unit 53.

  The determination unit 53 (cutting tool state determination unit) receives the difference in position information of each blade 21 passed from the comparison unit 52 and temporarily stores the information. Then, the difference in position of each blade 21 is averaged by the number of blades 21. If this average value is less than or equal to a preset value, it is determined that the cutting tool 2 is in a normal state. If the average value is less than or equal to a preset value, the cutting tool 2 is in an abnormal state. Determine. Then, the determination unit 53 passes the difference between the position information of each blade 21 and the determination result to the display device 6.

  The display device 6 displays and outputs the difference in position information of each blade 21 passed from the determination unit 53 and the determination result. If the operator who has seen this is in an abnormal state, the tooling holder 1 may be eccentric or the blade 21 may be worn or chipped. Investigate. In addition, even if the determination result is normal, the operator looks at the difference in the positional information of each blade 21 and can check the cutting tool 2 even when there is a blade 21 having an abnormally large difference. it can.

[Operation]
Next, the operation of the above-described cutting tool state detection system will be described with reference to the flowchart of FIG. First, the operator mounts the tooling holder 1 equipped with the cutting tool 2 on the spindle head unit 3 in a state where the spindle head unit 3 and the tooling holder 1 are cleaned. Thereby, the cutting using the cutting tool 2 is attained.

  As described above, when the operator performs an operation for instructing that the cutting process is possible, the air control unit 55 causes air to flow into the case 40 from the air inflow unit 45 (step). S1). In addition, the inflow of air into the case 40 may be performed only at the time of a cutting process described later.

  Subsequently, the operator inputs an instruction of “measurement (initial registration)” to the system (“measurement” in step S2). Then, first, the shutter 43 is opened by the shutter control unit 54 (step S3, shutter control step), and air is blown from the air blowing port 46 to the cutting tool 2 by the air control unit 55 (step S4). Thereafter, the spindle head unit 3 is rotationally driven, whereby the tooling holder 1 is rotated and the mounted cutting tool 2 is rotated. And as mentioned above, the distance to the rotation outer periphery of the cutting tool 2 is measured by the measurement part 51 (distance measurement process), and this distance data is temporarily stored and held (step S5, distance data accumulation process). Thereafter, the air control unit 55 stops air blowing to the cutting tool 2 (step S6).

  Subsequently, the system extracts position information corresponding to each distance to each blade 21 from the distance data acquired as described above, and the reference data storage unit 57 as reference position information (reference data) for each blade 21. (Yes in step S7, step S13).

  Thereafter, when the operator performs cutting, an instruction of “cutting” is input to the system (“cutting” in step S2). Then, first, it is confirmed whether the shutter 43 is closed by the shutter control unit 54. If not, the shutter 43 is closed by the shutter control unit 54 (step S11, shutter control step), and cutting is performed (step S12). . In the cutting process, the coolant is sprayed from the coolant spraying device 102 to the cutting tool 2, but as described above, the shutter 43 of the case 40 is closed and air flows into the case 40. Therefore, it is possible to prevent the coolant from flowing into the case 40. That is, it is possible to suppress the coolant from adhering to the optical distance sensor 41 in the case 40.

  When examining the state of the cutting tool 2 after performing cutting or reattaching the cutting tool 2 (tooling holder 1) as described above, the operator instructs the system to “measure”. (“Measurement” in step S2). Then, first, the shutter 43 is opened by the shutter control unit 54 (step S3, shutter control step), and air is blown from the air blowing port 46 to the cutting tool 2 by the air control unit 55 (step S4). Thereafter, the spindle head unit 3 is rotationally driven, whereby the tooling holder 1 is rotated and the mounted cutting tool 2 is rotated. And as mentioned above, the distance to the rotation outer periphery of the cutting tool 2 is measured by the measurement part 51 (distance measurement process), and this distance data is temporarily stored and held (step S5, distance data accumulation process). Thereafter, the air control unit 55 stops air blowing to the cutting tool 2 (step S6).

  Subsequently, the measurement unit 51 extracts position information corresponding to each distance to each blade 21 from the distance data acquired as described above, and passes it to the comparison unit 52 as current position information of each blade 21 (step). No in S7). The comparison unit 52 calculates the difference between the received position information of each blade 21 as current position information and the position information of each blade 21 as reference position information (reference data) stored in the reference data storage unit 57. The calculation is performed for each blade 21 (step S8, distance data comparison step). Then, the calculated difference between the reference position information of each blade 21 and the current position information is passed to the determination unit 53.

  Subsequently, the determination unit 53 averages the difference in position information of each blade 21 passed from the comparison unit 52 by the number of blades 21, and the cutting tool 2 is in a normal state or an abnormal state as described above. Is determined (cutting tool state determination step). If it is normal (Yes in step S9), it remains as it is, but if it is abnormal (No in step S9), it is output from the display device 6 that it is abnormal (step S10). ). At this time, a difference in position information of each blade 21 may be output, and even in a normal state, a difference to that effect and a position information of each blade 21 may be output.

  Thereby, the operator can detect the state of the cutting tool 2 quickly and appropriately, and can improve the processing efficiency using the machine tool.

  Although the present invention has been described with reference to the above-described embodiment and the like, the present invention is not limited to the above-described embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Tooling holder 11 Tool holding part 12 Flange part 13 Shank part 2 Cutting tool 21 Blade 3 Spindle head part 31 Holder holding hole 4 Distance sensor unit 40 Case 41 Distance sensor 41a Irradiation part 41b Reception part 42 Opening part 43 Shutter 43a Rotation drive part 43b Rotating shaft 44 Lid member 44a Second opening 45 Air inlet 46 Air spraying port 5 Control device 51 Measuring unit 52 Comparison unit 53 Determination unit 54 Shutter control unit 55 Air control unit 56 Measurement data storage unit 57 Reference data storage unit 6 Display device 7 Air supply machine 100 Machine tool 101 Processing table 102 Coolant spray device a Cutting facet

Claims (8)

A distance measuring means for measuring a distance to the rotation periphery of the cutting tool having a blade protruding to the periphery, attached to a rotation driving unit provided in the machine tool main body, when rotating the cutting tool;
Distance data storage means for storing distance data measured by the distance measurement means;
Distance data comparison means for comparing the distance data measured at different timings and stored in the distance data storage means;
Cutting tool state determining means for determining the state of the cutting tool based on the comparison result by the distance data comparing means,
The distance data comparison means specifies each blade portion data portion that measures the distance to the blade provided in the cutting tool from each distance data, and compares each blade portion data portion.
Cutting tool condition detection system. The cutting tool state detection system according to claim 1,
The distance measurement means includes an optical measurement unit that measures a distance to the rotation periphery by irradiating predetermined light around the rotation of the cutting tool,
A case that surrounds the distance measuring means and accommodates the distance measuring means;
An opening that exposes the optical measurement unit from the case toward the cutting tool is formed in the case so that the optical measurement unit can measure the distance to the rotation periphery of the cutting tool. Equipped with a movable shutter to open and close
Cutting tool condition detection system. The cutting tool state detection system according to claim 2,
The operation state of the machine tool is detected when cutting with the cutting tool and when the measurement is performed to measure the distance to the rotation periphery of the cutting tool, and the optical state is detected during the cutting process. The shutter is closed so that the measurement unit is not exposed to the outside from the inside of the case, and the shutter is movable so that the optical measurement unit is opened from the case to the cutting tool during the measurement. Provided with shutter control means for
Cutting tool condition detection system. The cutting tool state detection system according to claim 3,
At least during the cutting process, provided with a gas inflow means for flowing a predetermined gas into the case,
Cutting tool condition detection system. The cutting tool state detection system according to claim 3 or 4,
Gas spraying means for spraying gas against the cutting tool during the measurement,
Cutting tool condition detection system. The cutting tool detection system according to any one of claims 1 to 5,
The cutting tool is provided with a plurality of the blades,
The cutting tool state discriminating means compares each blade portion data portion corresponding to each of the plurality of blades provided in the cutting tool, and calculates a difference in distance to the blade in each blade. Determining the state of the cutting tool based on a value averaged by a number;
Cutting tool condition detection system. A distance measuring step of measuring a distance to a rotation periphery of a cutting tool having a blade protruding to the periphery, attached to a rotation driving unit provided in the machine tool body, when the cutting tool is rotated,
A distance data storage step for storing measured distance data, and
A distance data comparison step for comparing each of the distance data measured and accumulated at different timings;
A cutting tool state determination step of determining the state of the cutting tool based on the comparison result in the distance data comparison step,
In the distance data comparison step, each distance data is specified from each of the blade portion data portions that measure the distance to the blade, and each blade portion data portion is compared.
Cutting tool state detection method. The cutting tool state detection method according to claim 7,
The distance measuring step measures the distance to the rotation periphery by irradiating a predetermined light around the rotation of the cutting tool with an optical measurement unit housed in a case surrounding the periphery,
An opening formed in the case that exposes the optical measurement unit from the inside of the case toward the cutting tool so that the optical measurement unit can measure a distance to the rotation periphery of the cutting tool is provided by a shutter. A shutter control step for controlling opening and closing;
Cutting tool state detection method.

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