JP5121466B2 - Center height position adjusting device and center height position adjusting method - Google Patents

Description

  The present invention relates to an apparatus and a method for adjusting the center height position of a machine tool.

  Generally, in a machine tool that performs machining using a tool held on a tool post located at a position distant from the spindle with a workpiece mounted on the spindle, the center position of the tool is used to perform high-precision machining. Adjustments are made.

  For example, in Patent Document 1, the conical surface of a workpiece for adjusting the center height mounted on the spindle is irradiated with laser, and the tool (bite) is adjusted to a position where the cutting edge blocks the reflected laser beam, thereby adjusting the center height position. Techniques for performing are disclosed. Patent Document 2 discloses a technique for measuring the distance from the center of the spindle to the cutting edge using a touch sensor.

Japanese Patent No. 2668614 Japanese Patent Publication No. 8-351

  Conventionally, it is necessary to adjust the core height position in the machine tool every time the tool is replaced, and there is a problem that it is not easy to adjust the core height position and it takes time to start machining.

  In order to achieve the above object, the invention according to claim 1 is directed to a length measuring device mounted on a tool post of a machine tool and a length measuring device of the length measuring device when the center height position of the machine tool is detected. In a center height position adjustment device comprising position correction means for correcting the position of the tool rest so that the cutting edge of the tool mounted on the tool rest is located at the center height position of a machine tool based on the position of the tool rest. A detecting means for detecting in advance a difference between the detection position of the length measuring element and the cutting edge position of the cutting tool when the length measuring device and the cutting tool are mounted on the same surface is provided, and the position correcting means is a difference detected by the detecting means. A center height position adjusting device configured to perform correction based on the above is provided.

  According to a second aspect of the present invention, in the center height position adjusting device according to the first aspect, the detecting means is in contact with a reference mounting surface when the length measuring device and the tool are each mounted on the tool post. A measurement reference plane that includes a measurement reference plane that is mounted in a state, and that detects a distance between the detection position of the length measuring device mounted on the measurement reference plane and the measurement reference plane; and a measurement reference plane A cutting edge position detector for detecting the distance between the cutting edge position of the cutting tool mounted on the measuring tool and the measurement reference plane, and the difference between the distances detected by the measurement position detector and the cutting edge position detector is measured. Provided is a center height position adjusting device which makes a difference between a detection position of a first child and a blade edge position.

  According to a third aspect of the present invention, in the core height position adjusting device according to the first or second aspect, the length measuring device is a laser length measuring device, and the length measuring device is irradiated with the laser light from the laser length measuring device. A center height position adjusting device is provided.

  According to a fourth aspect of the present invention, in the center height position adjusting device according to the third aspect, the length measuring position detector includes a measuring rod that slides and a spherical measuring portion provided at an end of the measuring rod. And a core that performs detection based on the slide position of the measuring rod when the peripheral surface of the measuring portion is in contact with the measurement reference surface and the slide position of the measuring rod when the laser beam is reflected by the measuring portion at the shortest distance A high position adjusting device is provided.

  According to a fifth aspect of the present invention, there is provided the core height position adjusting device according to any one of the first to fourth aspects, wherein the detecting means is provided separately from the machine tool.

  The invention described in claim 6 is based on the length measuring device mounted on the tool rest of the machine tool, and the position of the tool rest when the length measuring device of the length measuring device detects the center height position of the machine tool. In the center height position adjustment method for correcting the position of the tool rest so that the cutting edge of the tool mounted on the tool rest is positioned at the center height of the machine tool, the measurement is performed when the length measuring device and the tool are mounted on the same surface. There is provided a core height position adjusting method including a step of detecting a difference between a detection position of a first child and a cutting edge position of a cutting tool in advance, and a step of correcting based on the detected difference.

  According to a seventh aspect of the present invention, in the core height position adjusting method according to the sixth aspect, the length measuring device and the cutting tool are mounted in a state in which the mounting reference planes are mounted in contact with the tool rest. A length measurement position detector that includes a measurement reference plane, and in the detecting step, detects a distance between a measurement position of a length measuring device attached to the measurement reference plane and the measurement reference plane; and a measurement reference Using a cutting edge position detector that detects the distance between the cutting edge position of the cutting tool mounted on the surface and the measurement reference surface, the difference in distance detected by the measurement position detector and the cutting edge position detector is Provided is a method for adjusting the center height as a difference between a detection position of the length measuring element and a blade edge position.

  An eighth aspect of the present invention is the laser height measurement method according to the sixth or seventh aspect, wherein a laser length measuring device is used as the length measuring device and a laser irradiated from the laser length measuring device as the length measuring device. A center height position adjusting method using light is provided.

  The invention according to claim 9 is the center height position adjusting method according to claim 8, wherein the length measuring position detector includes a measuring rod that slides and a spherical measuring portion provided at an end of the measuring rod. In the detecting step, the slide position of the measuring rod when the peripheral surface of the measuring portion is in contact with the measurement reference surface, and the slide position of the measuring rod when the laser beam is reflected by the measuring portion at the shortest distance A center height position adjusting method for performing detection is provided.

  A tenth aspect of the present invention provides the core height position adjusting method according to any one of the sixth to ninth aspects, wherein the detecting step is performed separately from the machine tool. .

  According to the present invention, by detecting in advance the difference between the detection position of the length measuring device and the cutting edge position of the cutting tool when the measuring device and the cutting tool are mounted on the same surface by the detecting means, the cutting tool once After the length measuring device is mounted on the mounting section and the length measuring element of the length measuring device detects the center height position of the machine tool, the length measuring device is not mounted on the tool post, and the tool mounted on the tool post is used. Accordingly, correction is performed by the position correction means, and the center position adjustment of the tool can be easily performed in a short time.

  Detection of the difference between the detection position of the length measuring device and the cutting edge position of the cutting tool when the measuring device and the cutting tool are mounted on the same surface by the detecting means is performed when the measuring device and the cutting tool are mounted on the tool post. A measurement measurement position detector that detects the distance between the measurement reference plane that is mounted in contact with the mounting reference plane and the distance between the measurement position of the length measuring device mounted on the measurement reference plane and the measurement reference plane And a cutting edge position detector for detecting the distance between the cutting edge position of the tool mounted on the measurement reference plane and the measurement reference plane, and the distance detected by the length measurement position detector and the cutting edge position detector. By making the difference the difference between the detection position of the length measuring element and the blade edge position, the difference can be realized with a simple configuration. A laser length measuring device can be used as the length measuring device.

  As shown in FIG. 1, the center height adjustment device includes a laser displacement sensor (hereinafter abbreviated as a sensor) 3 that is a length measuring device mounted on a tool post 2 of a machine tool 1 such as a lathe. Yes. The tool post 2 can mount a plurality of cutting tools side by side in the Y direction (indicated by the arrow 11) orthogonal to the axis of the main shaft 6 of the machine tool 1, and can select a cutting tool to be used for processing. Thus, it is provided to be movable in the Y direction. The sensor 3 is fixed to a sensor shank 4. The sensor shank 4 has a flat sensor mounting reference surface 23 (see FIGS. 4 and 5). In the groove portion for attaching the cutting tool formed on the tool post 2, a flat reference surface 5 for mounting the cutting tool orthogonal to the Y direction is formed. The sensor 3 is attached to the tool post 2 by attaching the sensor shank 4 to the groove so that the sensor attachment reference surface 23 and the reference surface 5 are in contact with each other.

  The sensor 3 irradiates the cylindrical workpiece 8 held by the chuck 7 of the spindle 6 with the laser beam 9 and receives the reflected light reflected by the peripheral surface of the workpiece 8, whereby the distance between the workpiece 8 and the sensor 8. A value corresponding to is output. As shown in FIG. 2A schematically showing the tool post 2 and the work 8 from the front, since the work 8 is cylindrical, the tool post 2 is moved in the Y direction within a range in which the laser beam 9 is irradiated to the work 8. When moved to, the distance from the sensor 3 to the peripheral surface of the work (irradiation position of the laser beam) changes. When the distance between the sensor 3 and the peripheral surface of the workpiece 8 becomes the shortest (indicated by a solid line in FIG. 2A), the laser beam 9 is irradiated onto the workpiece 8 at the center height position. The machine tool 1 of this embodiment is an NC lathe, and the movement of the tool post 2 in the Y direction is controlled by a control device (not shown), and the position of the tool post 2 in the Y direction can be stored on the control device side. it can. The output of the sensor 3 is input to the control device side. Based on the output of the sensor 3 when the distance between the sensor 3 and the peripheral surface of the workpiece 8 is the shortest, the position of the tool rest 2 in the Y direction when the laser light 9 is irradiated at the center height position as described above. Is stored on the control device side as the center height position when the sensor 3 is used. The workpiece 8 may be a test piece or the like obtained by cutting a material gripped by the chuck 7 of the spindle 6 into a cylindrical shape with a bite 13 so that the axis of the workpiece 8 and the axis of the spindle 6 coincide. desirable.

  As shown in FIG. 3, the machine tool 1 removes the sensor 3 from the tool rest 2 and attaches the cutting tool 13 to the tool rest 2, so that the tool 13 is mounted in the groove portion to which the sensor 3 is attached. It becomes possible. The cutting tool 13 has a structure in which a tip 12 used for actual processing is attached to the tip of the shank 14. A flat mounting reference surface 26 (see FIGS. 5 and 6) is formed on the shank 14. The cutting tool 13 is mounted on the tool rest 2 by attaching the shank to the groove so that the mounting reference surface 26 of the shank 14 and the reference surface of the groove are in contact with each other. However, even when the sensor 3 and the cutting tool 13 are replaced and attached to the same groove, the laser irradiation position of the sensor 3 that is mounted on the tool post 2 and the cutting tool that is mounted on the tool post 2 are not necessarily included. 13 cutting edge positions do not match in the Y direction. For this reason, even if the tool post 2 is arranged at the center height position when the sensor 3 is used as described above and the cutting tool 13 is mounted instead of the sensor 2, the cutting edge position of the cutting tool 13 is not necessarily the center height position. Don't be. The core height position adjusting device detects in advance the difference in the Y direction between the laser irradiation position of the sensor 3 mounted on the tool rest 2 and the cutting edge position of the cutting tool 13 mounted on the tool rest 2. As shown in FIG. 2B, the tool 13 is corrected by correcting the position of the tool post 2 in the Y direction by the correction amount d3 from the center height when the sensor 3 is used, as shown in FIG. Adjust the center height position when using. For this reason, the core height position adjusting device includes a measuring table 16 shown in FIG. 4 as a detecting means for detecting the correction amount d3.

  The measurement table 16 includes a base member 18 on which a planar measurement reference surface 17 is formed, and two micrometers 19 and 21. Both micrometers 19 and 21 are fixed to the base member 18 so that the measurement rod moves in a direction perpendicular to the measurement reference plane 17. A spherical body 22 is attached to the tip of the rod of one micrometer 19 as a measurement unit.

  The base member 18 can attach the sensor 3 by fixing the sensor shank 4 to the base member 18 so that the sensor mounting reference surface 23 of the sensor shank 4 and the measurement reference surface 17 are in contact with each other. When the sensor 3 is attached to the base member 18 as described above, as schematically shown in FIG. 5, the laser light 9 is emitted from the sensor 3 toward the sphere 22, and the sensor 3 is reflected by the surface of the sphere 22. By receiving the reflected light, a value corresponding to the distance between the sensor 3 and the sphere 22 is output. The micrometer 19 is provided such that the center of the sphere 22 moves perpendicularly to the measurement reference plane 17 by the movement of the rod. The laser beam of the sensor 3 is irradiated parallel to the measurement reference plane 17 and perpendicular to the movement locus of the center of the sphere 22. The micrometer 19 is adjusted and the rod is slid. When the output from the sensor 3 detects that the distance between the sensor 3 and the peripheral surface of the sphere 22 is the shortest (the state shown in FIG. 5), the micrometer 19. And the radius of the sphere 22 is added to the difference between the detected value of the sphere 22 and the detected value of the micrometer 19 when the sphere 22 is brought into contact with the measurement reference surface 17, whereby the measurement reference surface 17 and the irradiation position of the laser beam are A distance d1 in the Y direction can be detected.

  Instead of using the micrometer 19 provided with the sphere 22, a micrometer having a rod having a normal flat tip such as the micrometer 21 can also be used. In this case, when the micrometer is adjusted, the sensor outputs a value corresponding to the distance to the rod's circumferential surface in the range where the rod's circumferential surface reflects the laser beam, and the rod's circumferential surface stops reflecting the laser beam. Since the reflected light cannot be received, a value corresponding to infinity is output. As described above, d1 can be detected by the difference between the detection value of the micrometer when the output from the sensor is switched and the detection value of the micrometer when the tip of the rod is in contact with the measurement reference surface 17. .

  On the other hand, as shown in FIG. 6, the base member 18 can be mounted with the above-described bite 13 in place of the sensor 3 with the mounting reference surface 26 of the shank 14 and the measurement reference surface 17 in contact with each other. . In this case, as schematically shown in FIG. 5, the detected value of the micrometer 21 when the tip 27 of the rod of the micrometer 21 and the cutting edge 28 of the tool are at the same height (the state shown in FIG. 5) The difference between the detection value of the micrometer 21 when the tip 27 of the rod of the micrometer 21 is brought into contact with the measurement reference surface 17 is the distance d2 in the Y direction between the measurement reference surface 17 and the cutting edge position of the cutting tool 13. Can be detected.

  The difference between the distances d1 and d2 in the Y direction detected as described above is the difference in the Y direction between the irradiation position of the laser beam with respect to the mounting reference surface 23 of the sensor 3 and the cutting edge position with respect to the mounting reference surface 26 of the cutting tool 13. Thus, the difference between d1 and d2 is detected as the correction amount d3 on the measurement table 16 side. When d3 is input to the control device side, the tool post 2 is moved by the correction amount by the correction control for d3 by the control device, and the center height when the tool mounted on the measuring table 16 is mounted on the tool post 2 is set. The position is adjusted (see FIG. 2B). The control device constitutes position correction means for correcting the position of the tool post 2 in order to adjust the center height position.

  By using the measuring table 16 to detect in advance a difference d3 between the laser beam irradiation position on the mounting reference surface 23 of the sensor 3 and the cutting edge position of the various cutting tools on the mounting reference surface 26, the sensor table 2 is temporarily in contact with the tool rest 2. 3, and after detecting the position of the tool post 2 when the sensor 3 irradiates the laser beam at the core height position, the sensor 3 is attached to the tool post 2 or a tool is attached to the tool post to insert the core. Without adjusting the height, the position of the tool rest 2 is corrected by d3 on the control device side according to the tool mounted on the tool rest 2, and the center height adjustment of the tool is easily performed in a short time. be able to. Since the measuring table 16 can be provided separately from the machine tool 1, the correction amount d3 can be easily detected by external setup.

  In the measurement table described above, the sensor and the bite are measured with different micrometers, but a configuration in which measurement is performed with one micrometer is also possible. Alternatively, the sensor and the tool can be attached to different positions on the measuring table, and measurement can be performed for each.

  Further, in the above-described embodiment, the tool is configured to directly contact the measurement reference surface. However, measurement is performed on the measuring table while the tool is held by the tool holder, and the tool holder is attached to the tool rest together with the tool holder. The same effect can be obtained.

  Furthermore, in the above-described embodiment, a laser displacement sensor is used as the length measuring device and the laser beam is a length measuring device. However, a non-contact type capable of detecting the shortest distance to the workpiece instead of the laser displacement sensor. Sensors can also be used. When a contact-type length measuring device is used instead of a non-contact type sensor such as a laser displacement sensor, and the length measuring device is used by bringing the length measuring device into contact with the peripheral surface of the workpiece 8 (test piece). It can also be set as the structure which detects the center height apparatus of this machine tool.

It is a figure which shows the state which attaches the laser type displacement sensor to a machine tool, and measures the center height position. (A) It is a figure which shows the state of FIG. 1 typically, (b) It is a figure which shows the state which replaces | exchanges the sensor of (a) for a bite and performs core height position adjustment. It is a figure which shows the state which has attached the bite to the machine tool and is adjusting the core height position. It is a figure which shows the state which is measuring the distance of the laser-emission site | part of a sensor, and a reference plane using a measurement stand. It is a figure which shows typically the measurement using a measurement stand. It is a figure which shows the state which is measuring the distance of a bite blade edge | tip and a reference plane using a measurement stand.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Machine tool 2 Tool post 3 Sensor 4 Sensor shank 6 Spindle 8 Work piece 12 Tip 13 Byte 16 Measurement stand 17 Measurement reference plane 19, 21 Micrometer 22 Sphere 23, 26 Installation reference plane

Claims (10)

A length measuring device mounted on the tool rest of the machine tool, and a cutting edge of a tool mounted on the tool rest based on the position of the tool rest when the length measuring device of the length measuring device detects the center height position of the machine tool. In a center height position adjusting device comprising a position correcting means for correcting the position of the tool post so that the center height position of the machine tool is,
A detecting means for detecting in advance a difference between the detection position of the length measuring element and the cutting edge position of the cutting tool when the measuring device and the cutting tool are mounted on the same surface,
A center height position adjusting device configured to perform correction based on the difference detected by the detection unit.   The detection means includes a measurement reference surface that is mounted in a state in which the length measurement device and the cutting tool are in contact with the mounting reference surface when the tool is mounted on the tool post, and the length measurement device mounted on the measurement reference surface. Measuring position detector that detects the distance between the detection position of the length measuring element and the measurement reference plane, and the cutting edge position that detects the distance between the cutting edge position of the tool mounted on the measurement reference plane and the measurement reference plane The center height position adjustment according to claim 1, wherein a detector is provided, and a difference in distance detected by the length measurement position detector and the blade edge position detector is defined as a difference between the detection position of the length measuring element and the blade edge position. apparatus.   The center height position adjusting device according to claim 1 or 2, wherein the length measuring device comprises a laser length measuring device, and the length measuring device comprises laser light emitted from the laser length measuring device.   The measuring position detector includes a measuring rod that slides and a spherical measuring portion provided at the end of the measuring rod, and the measuring rod slides when the circumferential surface of the measuring portion is in contact with the measurement reference surface. The center height position adjusting device according to claim 3, wherein detection is performed based on the position and the slide position of the measuring rod when the laser beam is reflected by the measuring unit at the shortest distance.   The center height position adjusting device according to any one of claims 1 to 4, wherein the detecting means is provided separately from a machine tool. A length measuring device mounted on the tool rest of the machine tool, and a cutting edge of a tool mounted on the tool rest based on the position of the tool rest when the length measuring device of the length measuring device detects the center height position of the machine tool. In the center height position adjusting method for correcting the position of the tool post so that the center height position of the machine tool is,
A step of detecting in advance a difference between the detection position of the length measuring element and the cutting edge position of the cutting tool when the measuring device and the cutting tool are mounted on the same surface;
And a step of performing correction based on the detected difference.   The length measuring device and the cutting tool each have a measurement reference surface that is mounted in contact with a mounting reference surface when mounted on the tool post, and in the detecting step, the length measurement is mounted on the measurement reference surface. A measuring position detector that detects the distance between the detection position of the measuring element of the device and the measurement reference plane, and a cutting edge that detects the distance between the cutting edge position of the tool mounted on the measurement reference plane and the measurement reference plane The core height according to claim 6, wherein a difference in distance detected by the length measurement position detector and the blade edge position detector using a position detector is defined as a difference between the detection position of the length measuring element and the blade edge position. Position adjustment method.   The center height position adjusting method according to claim 6 or 7, wherein a laser length measuring device is used as the length measuring device, and laser light emitted from a laser length measuring device is used as the length measuring device.   The length measurement position detector includes a measuring rod that slides and a spherical measuring portion provided at an end of the measuring rod, and in the detecting step, the circumferential surface of the measuring portion is in contact with the measurement reference surface. The center height position adjusting method according to claim 8, wherein the detection is performed based on a sliding position of the measuring rod when the laser beam is reflected and a sliding position of the measuring rod when the laser beam is reflected by the measuring unit at the shortest distance.   The core height position adjusting method according to claim 6, wherein the detecting step is performed separately from the machine tool.

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