JP6573702B1 - Machine tool and workpiece mounting table tilt adjustment method - Google Patents

Abstract

To easily and quickly adjust the tilt of a workpiece. A machine tool (100) includes a base (1), a work mounting base (6) provided above the base (1), and a work mounting base (6) as the base (1). The clamper (8) to be pressed toward the base (1) is provided at least at three positions between the workpiece mounting base (6) and the base (1), and against the base (1) against the pressing force of the clamper (8). Based on the plurality of jacks (7), the target inclination of the workpiece reference plane, and the actual inclination of the workpiece reference plane attached to the workpiece holder (6) And a control device that controls the amount of increase of the plurality of jacks (7) so as to adjust the inclination of the reference plane of the workpiece to the target inclination. [Selection] Figure 2

Description

  The present application relates to a tilt adjustment method for a machine tool and a work mounting base.

  Conventionally, various configurations for adjusting the tilt of a workpiece in a machine tool are known (see, for example, Patent Document 1). Patent Document 1 discloses a horizontal NC machine tool including a mechanism for adjusting the tilt of a workpiece. In this machine tool, the table can rotate around the vertical Y axis (B axis direction). Further, on the table, there is mounted a tilt scale that is rotatable around the horizontal X axis (A axis direction). According to such a configuration, the tilt of the workpiece can be adjusted by the rotation in the A-axis direction and the rotation in the B-axis direction.

JP 2004-66438 A

  However, the machine tool of Patent Document 1 cannot adjust the tilt of the workpiece around the horizontal Z-axis (C-axis direction). Therefore, depending on the desired posture of the workpiece, adjustment of the tilt of the workpiece may be complicated and may take time. In addition, providing a rotational feed mechanism in the C-axis direction may require a large-scale structure, for example, in a machine tool that handles a large workpiece.

  An object of the present invention is to provide a machine tool that can easily and quickly adjust the tilt of a workpiece and a method for adjusting the tilt of a workpiece mount while solving the above-described problems.

  One aspect of the present disclosure is a machine tool capable of adjusting the inclination of a reference plane of an attached workpiece in an X, Y, and Z-axis machine coordinate system, the workpiece being provided above the base and the base Mounting base, clamper that pushes workpiece mounting base toward base, and at least three places between workpiece mounting base and base, and workpiece mounting base against base against pressing force of clamper The workpiece reference plane tilt is adjusted to the target tilt based on the multiple jacks, the target tilt of the workpiece reference plane, and the actual tilt of the workpiece reference plane mounted on the workpiece mount. Thus, it is a machine tool comprising a control device that controls the rising amounts of a plurality of jacks.

  In the machine tool according to one aspect of the present disclosure, the inclination of the reference plane of the workpiece is based on the actual inclination of the reference plane (for example, the upper surface) of the workpiece attached to the workpiece mount and the target inclination of the reference plane of the workpiece. The amount of increase of the plurality of jacks provided at at least three locations is controlled by the control device so as to be adjusted to the target inclination. Since the inclination of the plane can be determined by the coordinates of three points, the inclinations around the two horizontal axes can be substantially simultaneously controlled by controlling the rising amount of the jacks provided at least at three places by the control device. It can be adjusted automatically. Therefore, the inclination of the workpiece can be adjusted easily and quickly.

  The machine tool may further include a workpiece measuring device that measures X, Y, and Z-axis coordinate values at a plurality of points on a reference surface of the workpiece attached to the workpiece mounting base. The actual inclination of the reference plane of the workpiece attached to the workpiece mounting base may be calculated based on the X, Y and Z axis coordinate values of a plurality of points input from. In this case, the actual inclination of the reference plane of the workpiece is automatically measured. Therefore, the inclination of the workpiece can be adjusted more easily.

  Each of the plurality of jacks includes a motor, a screw shaft rotated by the motor, and a first wedge member translated by the screw shaft, wherein the first wedge member is inclined with respect to the translation direction of the first wedge member. And a second wedge member fixed to the work mounting base, wherein the second wedge member is slidably in contact with the first slide surface. And a second wedge member that is raised or lowered by the first wedge member. In this case, the jack can have a simple configuration.

  The work mount may have a swivel for turning the work around a vertical first axis. In this case, in addition to adjusting the inclination of the reference plane of the workpiece, the parallelism of the workpiece with respect to the horizontal feed axis can be adjusted.

  The work mounting base may have a fixing device for removably fixing the pallet on which the work is mounted. In a machine tool in which a pallet is used, there is a possibility that the inclination of the reference plane of the workpiece changes from pallet to pallet due to dimensional tolerance of the pallet. Therefore, the effect that the tilt of the workpiece can be adjusted easily and quickly can be more important.

  The machine tool is a plurality of displacement sensors, each of which is associated with one of the plurality of jacks and attached to at least one of the base and the work mounting base, and the work mounting base with respect to the base at the mounting position A plurality of displacement sensors may be further provided for detecting the position. In this case, the raising amount of each jack can be controlled by feedback control.

  Another aspect of the present disclosure is a method for adjusting the tilt of a work mounting base of a machine tool in an X, Y, and Z axis machine coordinate system, wherein the machine tool is located above the base and the base. The workpiece mounting base, the clamper that presses the workpiece mounting base toward the base, and at least three locations between the work mounting base and the base, and against the base against the pressing force of the clamper A plurality of jacks for lifting the work mounting base, and the method includes a step of attaching the work to the work mounting base, a step of pressing the work mounting base toward the base by a clamper, and a method of attaching the work mounting base to the work mounting base. Of the workpiece reference plane based on the process of determining the actual tilt of the workpiece reference plane, the target tilt of the workpiece reference plane and the actual tilt of the workpiece reference plane mounted on the workpiece mount. The So as to adjust the target slope, the jack, and a step of lifting the workpiece mounting table relative to the base against the pressing force of the clamper, and a workpiece mounting table tilt adjusting method.

  In the workpiece mount tilt adjustment method according to one aspect of the present disclosure, the tilt around two horizontal axes is substantially adjusted simultaneously by controlling the amount of lift of the jacks provided at least at three locations. Can do. Therefore, the inclination of the workpiece can be adjusted easily and quickly.

  In the step of lifting the workpiece mounting base with respect to the base, an upper limit value may be provided for the amount of one-time increase of the jack. When the actual inclination of the reference plane of the workpiece is significantly different from the target inclination, if the inclination is adjusted to the target inclination by raising the jack once, there is a possibility that a certain jack floats. If the jack floats, the jack may not rise properly. Therefore, it is possible to prevent the jack from being lifted by providing an upper limit value for the amount of one-time increase of the jack and repeating the increase of the jack a plurality of times.

  The method of adjusting the tilt of the work mounting base is a step of returning the plurality of jacks to the initial position, and moving the plurality of jacks to a predetermined height above the initial position and moving the plurality of jacks to the predetermined height. And lowering to an initial position. For example, when a certain jack is hardly raised from the initial position, there is a possibility that even if an attempt is made to return the jack to the initial position, the jack may not return correctly to the initial position due to factors such as backlash of the jack. is there. Therefore, first, the plurality of jacks are moved to a predetermined height above the initial position, and then the plurality of jacks are lowered from the position to the initial position, thereby correctly returning the plurality of jacks to the initial position. Can do.

  According to one aspect of the present disclosure, it is possible to easily and quickly adjust the tilt of the workpiece.

1 is a schematic perspective view showing a machine tool according to an embodiment. It is a schematic perspective view which shows the workpiece mounting base attached to the bed. It is a schematic side view which shows the H section of FIG. It is a schematic block diagram which shows the machine tool which concerns on embodiment. It is a flowchart which shows a part of operation | movement of the machine tool which concerns on embodiment. It is a flowchart following FIG. 5 which shows the remainder of operation | movement of the machine tool which concerns on embodiment. It is the schematic which shows the reference plane of the workpiece | work before and behind inclination adjustment in the case of four jacks. It is a flowchart which shows a part of subroutine in FIG. It is a flowchart which shows the remainder of the subroutine following FIG. 8 when the raising amount L2 in FIG. 7 is below the raising amount L4. It is a flowchart which shows the remainder of the subroutine following FIG. 8 when the raising amount L2 in FIG. 7 is larger than the raising amount L4.

  Hereinafter, with reference to an accompanying drawing, a tilt adjustment method of a machine tool and a work mounting base concerning an embodiment is explained. Similar or corresponding elements are denoted by the same reference numerals, and redundant description is omitted. In order to facilitate understanding, the scale of the figures may be changed.

  FIG. 1 is a schematic perspective view showing a machine tool 100 according to the embodiment. The machine tool 100 can be, for example, a large portal machining center and can process a large workpiece. The machine tool 100 may be another type of machine tool. Machine tool 100 is installed on foundation F which is the floor of a factory, for example. The machine tool 100 includes a bed (which may also be referred to as a base in the present disclosure) 1, a pair of columns 2, a cross rail 3, a saddle 5, a spindle head 4, and a work mount 6 (see FIG. 2). And. A main shaft that rotates about the axis Os is provided in the main shaft head 4. In FIG. 1, it should be noted that the work mounting base 6 is omitted for the sake of brevity.

  FIG. 2 is a schematic perspective view showing the work mounting base 6 attached to the bed 1. In the machine tool 100, the inclination of the reference plane of a workpiece (not shown) attached to the workpiece mounting base 6 can be adjusted. The reference plane of the workpiece can be any surface (for example, the upper surface) of the workpiece. The target value of the inclination of the reference plane of the workpiece can be set to various values according to various factors, such as a processing mode. With reference to FIG. 1, for example, the target value of the inclination of the reference plane of the workpiece may be perpendicular to the axis Os of the main axis. Further, for example, when a workpiece is processed by the heel of a face mill, the target value of the inclination of the reference plane of the workpiece can be set to an arbitrary angle (for example, 89 °) with respect to the axis line Os of the main axis. .

  With respect to the coordinate system, in this embodiment, the machine tool 100 is a vertical machining center, and the main shaft rotates around the vertical axis Os. In the machine coordinate system of the machine tool 100 according to the present embodiment, the direction along the axis Os is the Z-axis direction (which may also be referred to as the vertical direction). In this machine coordinate system, the direction in which the pair of columns 2 are arranged in the horizontal direction is the Y-axis direction (also referred to as the left-right direction). Furthermore, in this machine coordinate system, the direction perpendicular to the Y-axis direction (or the direction in which the spindle head 4 is attached to the cross rail 3) in the horizontal direction is referred to as the X-axis direction (also referred to as the front-rear direction). Get). With respect to the cross rail 3, the side on which the spindle head 4 is located is the front side, and the opposite side is the rear side.

  Each of the bed 1 and the pair of columns 2 is installed on the foundation F via a plurality of leveling blocks LB. The pair of columns 2 are arranged on both sides of the bed 1 with the bed 1 sandwiched along the Y-axis direction. Each of the bed 1 and the pair of columns 2 can be held in a desired posture and height by adjusting the height of the plurality of leveling blocks LB. The leveling block LB is adjusted, for example, when the machine tool 100 is installed and / or during periodic inspection.

  The cross rail 3 straddles the upper surfaces of the pair of columns 2. The cross rail 3 is driven on the column 2 along the X-axis direction by a feeding device Dx having a ball screw connected to a motor. The feeder Dx can include a scale for measuring the X coordinate value. A guide for guiding the movement of the cross rail 3 is arranged between the column 2 and the cross rail 3. The feed in the X-axis direction by the cross rail 3 is controlled by the NC device.

  The saddle 5 is attached to the cross rail 3. The saddle 5 is driven on the cross rail 3 along the Y-axis direction by a feeding device Dy having a ball screw connected to a motor. A guide for guiding the movement of the saddle 5 is arranged between the cross rail 3 and the saddle 5. The saddle 5 supports the spindle head 4 on the front surface. The spindle head 4 is driven on the saddle 5 along the Z-axis direction by a feeding device Dz having a ball screw connected to a motor. A guide for guiding the movement of the spindle head 4 is arranged between the saddle 5 and the spindle head 4. The feeding device Dy and the feeding device Dz may include scales for measuring the Y coordinate value and the Z axis coordinate value, respectively. The feed in the Y-axis direction by the saddle 5 and the feed in the Z-axis direction by the spindle head 4 are controlled by the NC device. The main shaft rotates around the vertical axis Os.

  With reference to FIG. 2, a work mounting base 6 is provided above the bed 1. The work mount 6 supports a work (not shown). In the present embodiment, the workpiece is mounted on the pallet P, and the workpiece mounting base 6 supports the pallet P. In another embodiment, the workpiece may be directly attached to the workpiece mounting base 6. In the present embodiment, the work mounting base 6 has a substantially rectangular shape in plan view. In other embodiments, the workpiece mounting base 6 may have a different shape (for example, a square shape, another polygonal shape, a circular shape, or an elliptical shape) in plan view.

  Between the work mounting base 6 and the bed 1, jacks 7 are provided at at least three places (four places in the present embodiment). In the present embodiment, the jacks 7 are provided at substantially four corners of the work mounting base 6 in plan view. For each jack 7, a clamper 8, an X-axis direction guide Gx, and a Y-axis direction guide Gy are provided on the bed 1.

  FIG. 3 is a schematic side view showing a portion H of FIG. It should be noted that in FIG. 3, the X-axis direction guide Gx and the Y-axis direction guide Gy are omitted for the sake of brevity. The clamper 8 presses the work mounting base 6 toward the bed 1. The clamper 8 includes a base 81 fixed on the bed 1, a column 82 fixed on the base 81, a rod-shaped pressing member 83 that can swing up and down around the column 82, and a pressing member 83. And a hydraulic cylinder 84 that is connected to one end and drives the pressing member 83 up and down. The other end portion of the pressing member 83 presses the stepped portion 6 a provided on the work mounting base 6 toward the bed 1. The hydraulic cylinder 84 can be controlled by the control device 20 (see FIG. 4 and described later in detail).

  With reference to FIG. 3, the jack 7 lifts the work mounting base 6 against the bed 1 against the pressing force of the clamper 8. In the present embodiment, the jack 7 includes a bracket 71, a motor 72, a screw shaft 73, a first wedge member 74, and a second wedge member 75.

  The bracket 71 is fixed on the bed 1. The bracket 71 supports the motor 72. The motor 72 can be various types of motors, for example, a pulse motor. The motor 72 can be controlled by the control device 20. The screw shaft 73 is connected to the motor 72 and is rotated by the motor 72. The screw shaft 73 includes a male screw portion. In the present embodiment, the axis of the screw shaft 73 is disposed along the X-axis direction. In another embodiment, the axis of the screw shaft 73 may be arranged along the Y-axis direction, for example, and arranged along a direction forming a predetermined angle with respect to the X-axis direction (or Y-axis direction). Or may be arranged along other horizontal directions.

  The first wedge member 74 is translated along the axis of the screw shaft 73 by the screw shaft 73. The first wedge member 74 is translated on the bracket 71 (or the bed 1) along the X-axis direction. The first wedge member 74 includes a female screw portion 74 a that engages with the male screw portion of the screw shaft 73. The first wedge member 74 includes a translation surface 74b and a first sliding surface 74c. The translation surface 74b is parallel to the translation direction (direction along the axis of the screw shaft 73) of the first wedge member 74, and slides on the bracket 71 (or the bed 1). The first sliding surface 74c is inclined with respect to the translational direction of the first wedge member 74 (the direction along the axis of the screw shaft 73).

  The second wedge member 75 is fixed to the work mounting base 6 and is raised or lowered by translation of the first wedge member 74. The second wedge member 75 includes a fixed surface 75a and a second sliding surface 75b. The fixed surface 75 a is, for example, along a horizontal plane, and is fixed to a step portion 6 b provided on the workpiece mounting base 6. The second sliding surface 75b slidably contacts the first sliding surface 74c of the first wedge member 74. Specifically, in the second sliding surface 75 b, the first wedge member 74 is disposed on the bracket 71 (or the bed 1), and the second wedge member 75 is attached to the work mounting base 6. In the state, it is configured to be parallel to the first sliding surface 74c.

  In the jack 7 having the above configuration, for example, the angle of the first sliding surface 74c (and the second sliding surface 75b) with respect to the axis of the screw shaft 73, the pitch of the screw shaft 73, and the like Based on this, by controlling the number of rotations of the motor 72 by the control device 20, it is possible to control the rising amount of the second wedge member 75 relative to the bed 1 (that is, the rising amount of the jack 7).

  Referring to FIG. 2, the X-axis direction guide Gx and the Y-axis direction guide Gy are configured to contact the side surface of the workpiece mounting base 6 from the X-axis direction and the Y-axis direction, respectively. Each of the X-axis direction guide Gx and the Y-axis direction guide Gy includes, for example, a base member G1 fixed on the bed 1, a contact member G2 fixed to the base member G1, and contacting the side surface of the work mounting base 6. Can be included. The contact member G2 can include, for example, a material having excellent slidability (for example, a fluororesin such as PTFE (polytetrafluoroethylene)). The X-axis direction guide Gx and the Y-axis direction guide Gy having the above-described configuration can guide the workpiece mounting base 6 to be raised or lowered.

  Referring to FIG. 3, a displacement sensor 76 and a level switch 77 are provided for each jack 7. Each of the displacement sensor 76 and the level switch 77 can be attached to at least one of the bed 1 and the workpiece mounting base 6 in association with the corresponding jack 7 (for example, adjacent to the corresponding jack 7). The displacement sensor 76 can detect the amount of ascent from the initial position (for example, the lowest position) of the work mounting base 6 with respect to the bed 1 at the mounting position. This amount of increase can be treated as the amount of increase from the initial position of the corresponding jack 7. The displacement sensor 76 can be various types of sensors (for example, an eddy current displacement sensor, a capacitance displacement sensor, or a contact position detector).

  The level switch 77 can detect that the workpiece mounting base 6 is in the initial position (for example, the lowest position) with respect to the bed 1 at the mounting position. From another point of view, the level switch 77 can detect that the corresponding jack 7 is in the initial position. The level switch 77 can be various types of sensors (eg, limit switches, photoelectric switches, etc.).

  With the displacement sensor 76 as described above, it is possible to measure the actual amount of elevation of each jack 7. Further, the displacement sensor 76 can detect that the workpiece mounting base 6 has returned to the initial position when, for example, the workpiece processing is completed and the pallet P is replaced. In the machine tool 100 in which the pallet P is used, there is a possibility that the next pallet P cannot be transferred to the workpiece mounting base 6 when the workpiece mounting base 6 has not returned to the initial position. Such an inconvenience can be prevented by the displacement sensor 76. Similarly, since the level switch 77 can detect that the workpiece mounting base 6 has returned to the initial position, the inconvenience as described above can be prevented.

  The work mounting base 6 has a swivel base 61 for turning the work around an axis (first axis) Oc along the vertical direction (Z-axis direction). The swivel base 61 is supported by, for example, a cross roller bearing, and is rotated by, for example, a feeding device Dc (see FIG. 2) including a motor. With reference to FIG. 3, the rotational feed direction by the turntable 61 can be defined as the C-axis direction. Feeding in the C-axis direction by the swivel base 61 is controlled by the NC device.

  The work mount 6 has a fixing device 63 for removably fixing the pallet P to which the work is mounted. For example, the fixing device 63 is engaged with a collet chuck 63a for gripping and pulling the pull stud Pa provided on the bottom surface of the pallet P, and a female member Pb having a recess provided on the bottom surface of the pallet P. And a convex male member 63b. The fixing device 63 may further include another mechanism (for example, a lifter for lifting or lowering the pallet P when changing the pallet).

  FIG. 4 is a schematic block diagram illustrating the machine tool 100 according to the embodiment. The machine tool 100 includes the feeding devices Dx, Dy, Dz, Dc, the NC device 10, the control device 20, the operating device 30, the pallet changer 40, the workpiece measuring device 50, and the displacement sensor 76. The clamper 8, the jack 7, and the storage device 60 are provided, and these components are connected to each other so as to be communicable with each other by wiring such as a bus. A duplicate description of the components already described is omitted.

  The NC device 10 controls the operations of the feeding devices Dx, Dy, Dz, Dc based on the machining program. The NC device 10 can be attached to any component of the machine tool 100 (e.g., the bed 1 or the column 2), for example, may be disposed around any component of the machine tool 100, or It may be attached to any component of the machine tool 100. The NC device 10 includes a storage unit (not shown) for storing a machining program and a processor (not shown) such as one or more CPUs (Central Processing Units) for executing the machining program. it can.

  The control device 20 controls various components of the machine tool 100. The control device 20 may be attached to any component of the machine tool 100, and may be disposed around any component (eg, the bed 1 or the column 2) of the machine tool 100, or It may be attached to any component of the machine tool 100. The control device 20 can include, for example, a processor such as one or more CPUs. The control device 20 may further include other components such as a ROM (read only memory) and a RAM (random access memory).

  The controller device 30 can include a display unit configured to show information to the user and an input unit configured to accept input from the user. The operating device 30 can include, for example, a touch panel. The operation device 30 may include a display device such as a liquid crystal display, and an input device such as a keyboard and / or a mouse. The user can input various commands to the operation device 30.

  The pallet changer 40 conveys the pallet P to the work mounting base 6 and exchanges the pallet P on the work mounting base 6 with the next pallet P.

  The workpiece measuring device 50 can measure the X, Y, and Z axis coordinate values of points on the workpiece attached to the workpiece mounting base 6. With reference to FIG. 1, the workpiece | work measuring apparatus 50 can contain the touch probe TP attached to the main axis | shaft and the scale which each of the feeders Dx, Dy, and Dz has, for example. In the workpiece measuring device 50, the touch probe TP attached to the main shaft is moved by the feeding devices Dx, Dy, and Dz, and the X-axis coordinate value, the Y-axis coordinate value, and the Z-axis of the scale when the touch probe TP contacts the workpiece. Coordinate values are measured.

  Referring to FIG. 4, the storage device 60 can include, for example, one or a plurality of hard disk drives. The storage device 60 can store various programs executed by the control device 20. For example, the storage device 60 stores a workpiece measurement program 60a, a parallelism adjustment program 60b, an inclination adjustment program 60c, and a jack reset program 60d. The storage device 60 may store other programs and other information.

  The workpiece measurement program 60a is used to measure (1) the inclination of the reference plane of the workpiece mounted on the workpiece mount 6 and (2) the parallelism of the workpiece with respect to the X axis or the Y axis.

  When the workpiece measurement program 60a is executed to measure the tilt of the workpiece reference plane, the control device 20 sets the X-axis coordinate, the Y-axis coordinate, and the Z-axis coordinate for a plurality of points on the workpiece reference plane. A command is sent to the workpiece measuring device 50 so as to measure. The plurality of points on the reference plane of the workpiece are, for example, a certain first point, a second point separated from the first point by a predetermined distance in the X-axis direction, and the first point in the Y-axis direction. It may be a third point that is separated by a predetermined distance. The control device 20 can calculate the inclination of the reference plane in the X-axis direction from the coordinate values of the first point and the second point that are separated in the X-axis direction. Further, the control device 20 can calculate the inclination of the reference plane in the Y-axis direction from the coordinate values of the first point and the third point that are separated in the Y-axis direction.

  When the workpiece measurement program 60a is executed to measure the parallelism of the workpiece with respect to the X axis, the control device 20 determines the X axis coordinate, the Y axis coordinate, and the plurality of points on the side surface of the workpiece along the X axis direction. And a command is sent with respect to the workpiece | work measuring apparatus 50 so that a Z-axis coordinate may be measured. The plurality of points on the side surface of the workpiece can be, for example, a certain first point and a second point separated from the first point by a predetermined distance in the X-axis direction. From the coordinate values of the first point and the second point, the parallelism (inclination) of the workpiece with respect to the X axis can be calculated. Similarly, when measuring the parallelism of the workpiece with respect to the Y-axis, the X-axis coordinates for a plurality of points (two points separated by a predetermined distance in the Y-direction) on the side surface of the workpiece along the Y-axis direction, By measuring the Y-axis coordinates and the Z-axis coordinates, the parallelism (inclination) of the workpiece with respect to the Y-axis can be calculated.

  As described above, in the present embodiment, the actual inclination of the workpiece reference plane and the actual parallelism of the workpiece are calculated using the workpiece measuring device 50 and the workpiece measuring program 60a. However, in other embodiments, these values may be calculated by the user and input from the controller device 30. For example, the user can attach a displacement meter (for example, a dial gauge) to the end face of the main shaft with a fixing means (for example, a magnet), and by manually operating the main shaft, the X of the point on the workpiece as described above can be obtained. An axis coordinate value, a Y-axis coordinate value, and a Z-axis coordinate value can be measured. In this case, the coordinate values of the plurality of points can be relative values with respect to the coordinate value of a certain point. The user can calculate the actual inclination of the reference plane of the workpiece and the actual parallelism of the workpiece based on the measured coordinate values. For example, the user can calculate the inclination of the reference plane of the workpiece in the X-axis direction and the Y-axis direction by using a level. The user can input the calculated inclination and parallelism through the operation device 30.

  The parallelism adjustment program 60b is used to adjust the parallelism of the workpiece with respect to the X axis or the Y axis to a target parallelism (for example, 0 ° with respect to the X axis or the Y axis). For example, the target parallelism may be input from the operation device 30 by the user, or may be stored in the storage device 60 in association with the type of workpiece or machining. When executing the parallelism adjustment program 60b, the control device 20 calculates the necessary rotation angle of the swivel base 61 in the C-axis direction based on the actual parallelism of the workpiece and the target parallelism. The rotation angle can be calculated, for example, as a difference between the actual parallelism of the workpiece and the target parallelism. The control device 20 sends the calculated rotation angle to the NC device 10, and the NC device 10 drives the feed device Dc.

  The tilt adjustment program 60c is used to adjust the tilt of the reference plane of the workpiece to a target tilt (for example, perpendicular to the axis Os). For example, the target inclination may be input from the operation device 30 by the user, or may be stored in the storage device 60 in association with the type of workpiece or machining. When executing the inclination adjustment program 60c, the control device 20 calculates a necessary amount of increase of each jack 7 based on the actual inclination and the target inclination of the reference plane of the workpiece. The amount of increase can be calculated, for example, according to the following steps. First, the distance Lx between the jacks 7 in the X-axis direction (for example, 1 m40 cm), the distance Ly between the jacks 7 in the Y-axis direction (for example, 1 m20 cm), and the actual inclination of the workpiece reference surface (inclination in the X-axis direction) And the inclination in the Y-axis direction), the current height is calculated for a plurality of points on the reference plane corresponding to the position of the jack 7. It should be noted that the above numerical values are merely examples, and in other embodiments, the distances Lx and Ly can be other values. The calculated current height may be an absolute value in the machine coordinate system, or may be a relative value based on a certain point. The distances Lx and Ly between the jacks 7 can be the distance between the second wedge members 75, for example. The distances Lx and Ly may be input from the operation device 30 by the user, or may be stored in the storage device 60, for example.

  Based on the calculated current height, the highest point is selected from the plurality of points. Subsequently, the highest point is set as a reference point that does not move, and the target heights of the remaining points are determined based on the target inclination of the reference plane of the workpiece. Subsequently, for the remaining points, the amount of increase is calculated as the difference between the target height and the current height. That is, in this case, the jack 7 corresponding to the highest point is not raised in the inclination adjustment program 60c. The control device 20 drives the motor 72 of each jack 7 by the number of rotations corresponding to the calculated amount of increase.

  The jack reset program 60d is used to return all the jacks 7 to the initial positions. All the jacks 7 can be returned to their initial positions, for example, every time when the workpiece is finished and the pallet P is replaced. When executing the jack reset program 60d, the control device 20 calculates the distance from the current position to a predetermined height above the initial position for each jack 7. The current position of each jack 7 can be measured by a displacement sensor 76. As the “predetermined height”, an optimum height is calculated or experimentally obtained so as to return to the initial position stably each time (for example, 0.3 mm from the initial position). It should be noted that the above numerical values are merely examples, and in other embodiments the predetermined height can be other values. The predetermined height may be input from the operation device 30 by the user, or may be stored in the storage device 60, for example. The control device 20 drives the motor 72 of each jack 7 so as to raise or lower each jack 7 by the calculated distance, whereby all the jacks 7 are moved to a predetermined height. When the jack 7 is greatly raised from the initial position in the tilt adjustment program 60c, the jack 7 can be lowered to a predetermined height in the jack reset program 60d. In contrast, if the jack 7 is not raised or slightly raised from the initial position in the tilt adjustment program 60c, the jack 7 can be raised to a predetermined height in the jack reset program 60d. Subsequently, the control device 20 drives the motor 72 of each jack 7 so as to lower each jack 7 from the predetermined height to the initial position in the same order every time, so that all the jacks 7 are moved to the initial position. Returned.

  Next, the operation of the machine tool 100 will be described. FIG. 5 is a flowchart showing a part of the operation of the machine tool 100 according to the embodiment.

  In this operation, first, the control device 20 sends a command to the pallet changer 40 to replace the pallet P on the work mount 6 with the next pallet P (step S100). Subsequently, the control device 20 executes the workpiece measurement program 60a and measures the parallelism of the workpiece with respect to the X axis or the Y axis (step S102). Subsequently, the control device 20 executes the parallelism adjustment program 60b and adjusts the parallelism to the target parallelism by rotating the swivel base 61 in the C-axis direction (step S104).

  Subsequently, the control device 20 executes the workpiece measurement program 60a, measures the inclination of the reference plane of the workpiece (Step S106), and acquires the actual inclination of the reference plane of the workpiece (Step S108). Subsequently, the control device 20 acquires the target inclination of the reference plane of the workpiece from the user (or from the storage device 60) through the operation device 30 (step S110). Subsequently, the control device 20 calculates the amount of increase of each jack 7 based on the actual inclination of the reference plane of the workpiece and the target inclination (step S112). Subsequently, the control device 20 determines whether the number of jacks 7 is three or four or more (step S114). The number of jacks 7 may be input from the operation device 30 by the user, or may be stored in the storage device 60.

  When the number of jacks 7 is three in step S114, the control device 20 commands each jack 7 to the calculated amount of increase (the number of rotations corresponding to the calculated amount of increase is sent to the motor 72 of each jack 7). Command) (step S116), and the plurality of jacks are simultaneously driven until the detected value of the displacement sensor 76 associated with each jack 7 reaches the commanded increase amount (step S118). Subsequently, the control device 20 executes the workpiece measurement program 60a again, and measures the tilt after the adjustment of the reference plane of the workpiece (step S122).

  When the number of jacks is four or more in step S114, the control device 20 executes a split lift operation (described later in detail) that is a subroutine (step S120). Subsequently, the control device 20 executes the workpiece measurement program 60a again, and measures the tilt after the adjustment of the reference plane of the workpiece (step S122).

  FIG. 6 is a flowchart subsequent to FIG. 5 illustrating the rest of the operation of the machine tool 100 according to the embodiment. Subsequently, the control device 20 determines whether or not the difference between the adjusted inclination of the reference plane of the workpiece measured in step S122 and the target inclination is equal to or less than an allowable value (step S124). . The allowable value may be input from the operating device 30 by the user, or may be stored in the storage device 60, for example. When the difference is larger than the allowable value in step S124, the control device 20 executes the above steps S112 to S122 again. In the re-execution of step S112 to step S122, a maximum number of repetitions may be set.

  When the difference is equal to or smaller than the allowable value in step S124, the control device 20 transmits a command to the constituent elements of the machine tool 100 to start machining the workpiece (step S126), and finishes the machining (step S128). Subsequently, the control device 20 executes the jack reset program 60d described above to move each jack 7 to a predetermined height (step S130), and then lowers each jack to the initial position (step S132). Subsequently, the control device 20 determines whether or not each jack 7 has returned to the initial position (step S134). Step S134 can be executed, for example, by determining whether or not the detection value of each displacement sensor 76 indicates an initial position (for example, zero). Further, step S134 can be executed, for example, by determining whether or not the level switch 77 has detected that the corresponding jack 7 is in the initial position.

  In step S134, when each jack 7 has not returned to the initial position, the control device 20 executes the above steps S130 to S132 again. The maximum number of repetitions may be set for re-execution of steps S130 to S132. In step S134, when each jack 7 has returned to the initial position, the control device 20 sends a command to the pallet changer 40 to replace the pallet P on the work mount 6 with the next pallet P ( In step S136), the series of operations ends. If step S130 is omitted and each jack is suddenly lowered to the initial position, the hysteresis characteristic of the jack 7 may not return to the initial position. However, if each jack 7 is lowered to the predetermined height and then lowered in the same order every time, the error when returning to the initial position is reduced.

  Next, the above subroutine (divided lift operation) will be described in detail.

  FIG. 7 is a schematic diagram showing a workpiece reference surface R before and after tilt adjustment when there are four jacks. FIG. 7 shows the reference plane R0 of the workpiece before the tilt adjustment and the reference plane R1 after the tilt adjustment. The points P1 to P4 are respectively positioned on the reference plane R corresponding to the positions of the four jacks 7 (X-axis coordinate value and Y-axis coordinate value). In this example, the reference plane R1 after the tilt adjustment is adjusted to be perpendicular to the axis Os of the main axis. Therefore, the points P1 to P4 are located at the same height after the inclination adjustment.

  As described in relation to the tilt adjustment program 60c, when adjusting the tilt of the work mount 6, the jack 7 at the highest point P1 is fixed and the jacks 7 at other points P2, P3, P4 are fixed. Can be adjusted simultaneously to adjust the inclination of the reference plane R. As described above, in this example, since the reference plane R1 after the tilt adjustment is adjusted to be perpendicular to the axis Os of the main shaft, the rising amounts L2, L3, and L4 of the jacks 7 are respectively tilted. It can be calculated as a difference between the height of the points P2, P3, P4 before the adjustment and the height of the point P1. Note that since the reference plane R is maintained flat before and after the tilt adjustment, the relationship L3-L4 = L2 is established in the present embodiment where the point P3 is the lowest.

  When four jacks 7 are used as in the present embodiment, and the actual inclination is significantly different from the target inclination (that is, when the largest amount of increase L3 is too large), the inclination of one jack 7 is reduced. If the target inclination is adjusted by ascending, the second wedge member 75 of the jack 7 at the point P <b> 2 or P <b> 4 may float from the first wedge member 74. When the second wedge member 75 is lifted from the first wedge member 74, the jack 7 may not be lifted correctly. Therefore, the upper limit Lmax is provided for the amount of increase of each jack 7, and the lifting of the jack 7 is repeated a plurality of times to prevent the jack 7 from floating. It should be noted that when the jack 7 is lifted, the corresponding displacement sensor 76 shows a constant detection value even if the jack 7 is raised. Therefore, it is possible to monitor whether or not the jack 7 is lifted by the displacement sensor 76.

  The upper limit value Lmax depends on the rigidity of the workpiece mounting base 6 and when the point P1 is fixed and the jack 7 at the point P3 is raised, the maximum rise amount that does not cause the jack 7 at the other point P2 or P4 to float. (For example, 0.5 mm) can be determined by experiment or analysis. It should be noted that the above numerical values are merely examples, and the upper limit Lmax may be other numerical values in other embodiments. When the work mount 6 has high rigidity and is difficult to twist, the upper limit Lmax is small. In contrast, when the work mount 6 has low rigidity and is easily twisted, the upper limit Lmax is large.

  FIG. 8 is a flowchart showing a part of the subroutine in FIG. In this subroutine, first, the control device 20 sets the division number n to n = 1 (step S200). Subsequently, with respect to the largest increase amount L3, the control device 20 determines whether or not L3 / n is equal to or less than the upper limit value Lmax (step S202). When L3 / n is larger than the upper limit value Lmax in step S202, the control device 20 sets the division number n to n = n + 1 (step S204) and repeats step S202 again.

  When L3 / n is equal to or smaller than the upper limit value Lmax in step S202, the control device 20 sets the repetition number i to i = 1 (step S206). Subsequently, the control device 20 determines whether or not the increase amount L2 of the jack 7 at the point P2 is equal to or less than the increase amount L4 of the jack 7 at the point P4 (step S208).

  FIG. 9 is a flowchart showing the remainder of the subroutine following FIG. 8 when the increase amount L2 in FIG. 7 is equal to or less than the increase amount L4. When the increase amount L2 is not more than the increase amount L4 in step S208, the control device 20 increases the jacks 7 at points P2, P3, and P4 by the increase amount L2 / n, respectively (step S300). Subsequently, the control device 20 raises the jacks 7 at the points P3 and P4 by the amount of increase (L4-L2) / n, respectively (step S302). Subsequently, the control device 20 raises the jack 7 at the point P3 by the raising amount (L3-L4) / n (step S304).

  By the above steps S300 to S304, the jack 7 at the point P2 is raised by the rising amount L2 / n, the jack 7 at the point P4 is raised by the rising amount L2 / n + (L4-L2) / n = L4 / n, The jack 7 at the point P3 is raised by an increase amount L2 / n + (L4-L2) / n + (L3-L4) / n = L3 / n. That is, the jacks 7 at the points P2, P3, and P4 are raised by n divisions of the final rising amounts L2, L3, and L4, respectively. Therefore, by repeating steps S300 to S304 n times, the jacks 7 at the points P2, P3, and P4 are raised by the final increase amounts L2, L3, and L4, respectively. In this case, in each repetition of step S300 to step S304, the increase amount L3 / n of the jack 7 at the point P3 is equal to or less than the upper limit value Lmax as determined in step S202 above. Therefore, in each repetition of step S300 to step S304, it is possible to reliably prevent the jack 7 at another point P2 or P4 from floating.

  Subsequently, the control device 20 determines whether or not the repetition number i is i = n (step S306). If the number of repetitions i is not i = n in step S306, the control device 20 sets the number of repetitions i to i = i + 1 (step S308) and executes the above steps S300 to S306 again. When the repetition number i is i = n in step S306, the control device 20 ends the subroutine.

  FIG. 10 is a flowchart showing the remainder of the subroutine following FIG. 8 when the increase amount L2 in FIG. 7 is larger than the increase amount L4. When the increase amount L2 is larger than the increase amount L4 in step S208, the control device 20 increases the jacks 7 at points P2, P3, and P4 by the increase amount L4 / n, respectively (step S400). Subsequently, the control device 20 raises the jacks 7 at the points P2 and P3 by the amount of increase (L2-L4) / n, respectively (step S402). Subsequently, the control device 20 raises the jack 7 at the point P3 by an increase amount (L3-L2) / n (step S404).

  By the above steps S400 to S404, the jack 7 at the point P4 is increased by the increase amount L4 / n, the jack 7 at the point P2 is increased by the increase amount L4 / n + (L2−L4) / n = L2 / n, The jack 7 at the point P3 is raised by the increase amount L4 / n + (L2−L4) / n + (L3−L2) / n = L3 / n. That is, the jacks 7 at the points P2, P3, and P4 are raised by n divisions of the final rising amounts L2, L3, and L4, respectively. Therefore, by repeating steps S400 to S404 n times, the jacks 7 at points P2, P3, and P4 are raised by the final increase amounts L2, L3, and L4, respectively. In this case, in each repetition of step S400 to step S404, the increase amount L3 / n of the jack 7 at the point P3 is equal to or less than the upper limit value Lmax as determined in step S202 above. Therefore, in each repetition of step S400 to step S404, it is possible to reliably prevent the jack 7 at the other point P2 or P4 from floating.

  Subsequently, the control device 20 determines whether or not the number of repetitions i is i = n (step S406). When the repetition number i is not i = n in step S406, the control device 20 sets the repetition number i to i = i + 1 (step S408), and executes the above steps S400 to S406 again. When the repetition number i is i = n in step S406, the control device 20 ends the subroutine.

  In the machine tool 100 according to the embodiment as described above, the inclination of the reference plane of the workpiece is based on the actual inclination of the reference plane of the workpiece attached to the workpiece mount 6 and the target inclination of the reference plane of the workpiece. The control device 20 controls the rising amounts of the plurality of jacks 7 provided at at least three locations so as to be adjusted to the target inclination. Since the inclination of the plane can be determined by the coordinates of three points, the inclination about the two horizontal axes X and Y can be substantially controlled by controlling the amount of elevation of the jacks 7 provided in at least three places. It can be adjusted automatically at the same time. Therefore, the inclination of the workpiece can be adjusted easily and quickly.

  The machine tool 100 further includes a workpiece measuring device 50 that measures X, Y, and Z-axis coordinate values at a plurality of points on the reference plane of the workpiece mounted on the workpiece mounting base 6. Calculates the actual inclination of the reference plane of the workpiece mounted on the workpiece mount 6 based on the X, Y and Z axis coordinate values of a plurality of points input from the workpiece measuring device 50. Therefore, the actual inclination of the reference plane of the workpiece is automatically measured. Therefore, the inclination of the workpiece can be adjusted more easily.

  In the machine tool 100, each of the plurality of jacks 7 includes a motor 72, a screw shaft 73 that is rotated by the motor 72, and a first wedge member 74 that is translated by the screw shaft 73. A first wedge member 74 including a first sliding surface 74c inclined with respect to the translational direction of the wedge member 74, and a second wedge member 75 fixed to the workpiece mounting base 6; A second wedge member 75 including a second slide surface 75b slidably in contact with the slide surface 74c and raised or lowered by the first wedge member 74. Therefore, the jack 7 can have a simple configuration.

  Further, in the machine tool 100, the work mounting base 6 has a turntable 61 for turning the work around the vertical first axis Oc. Therefore, in addition to adjusting the inclination of the reference plane of the workpiece, the parallelism of the workpiece with respect to the horizontal feed axis X or Y can be adjusted.

  Further, in the machine tool 100, the work mounting base 6 has a fixing device 63 for removably fixing the pallet P to which the work is mounted. In the machine tool 100 in which the pallet P is used, there is a possibility that the inclination of the reference plane of the workpiece changes for each pallet P due to the dimensional tolerance of the pallet P or the like. Therefore, the effect that the tilt of the workpiece can be adjusted easily and quickly becomes more important.

  Moreover, the machine tool 100 is a plurality of displacement sensors 76, each of which is associated with one of the plurality of jacks 7 and attached to at least one of the bed 1 and the work mounting base 6, and at the attachment position. A plurality of displacement sensors 76 for detecting the position of the work mounting base 6 with respect to the bed 1 are further provided. Therefore, the raising amount of each jack 7 can be controlled by feedback control.

  Another aspect of the present disclosure is a method for adjusting the inclination of the workpiece mounting base 6 of the machine tool 100 in the X, Y, and Z-axis machine coordinate systems, and the step of attaching a workpiece to the workpiece mounting base 6 A step of pressing the work mounting base 6 toward the bed 1 by the clamper 8, a step of obtaining an actual inclination of the reference plane of the work attached to the work mounting base 6, a target inclination of the reference plane of the work, The jack 7 resists the pressing force of the clamper 8 by the jack 7 so as to adjust the inclination of the reference plane of the workpiece to the target inclination based on the actual inclination of the reference plane of the workpiece attached to the workpiece mounting base 6. And lifting the workpiece mounting base 6 with respect to 1. In this method, the inclinations around the two horizontal axes X and Y can be adjusted at the same time by controlling the amount of elevation of the jacks 7 provided at at least three locations. Therefore, the inclination of the workpiece can be adjusted easily and quickly.

  Moreover, in the method of this indication, in the process of lifting the workpiece mounting base 6 with respect to the bed 1, an upper limit value Lmax is provided for the amount by which the jack 7 is raised once. Therefore, it is possible to prevent the jack 7 from being lifted.

  In addition, the method according to the embodiment is a step of returning the plurality of jacks 7 to the initial position, and moving the plurality of jacks 7 to a predetermined height above the initial position; And lowering from the height to the initial position. Therefore, the plurality of jacks 7 can be correctly returned to the initial positions.

  Although the embodiments of the machine tool and the workpiece mounting tilt adjustment method have been described, the present invention is not limited to the above-described embodiments. Those skilled in the art will appreciate that various modifications of the above-described embodiments are possible. In addition, a person skilled in the art can incorporate a feature included in one embodiment into another embodiment or replace a feature included in the other embodiment as long as no contradiction arises. Will understand.

1 bed (base)
6 Work Mounting Base 7 Jack 8 Clamper 20 Control Device 50 Work Measurement Device 61 Swivel Table 63 Fixing Device 72 Motor 73 Screw Shaft 74 First Wedge Member 74c First Sliding Surface 75 Second Wedge Member 75b Second Slide Moving surface 76 Displacement sensor 100 Machine tool Oc First axis P Pallet R, R0, R1 Work reference plane

Claims (9)

In the X, Y and Z axis machine coordinate system, a machine tool capable of adjusting the inclination of the reference plane of the mounted workpiece,
The base,
A workpiece mounting base provided above the base;
A clamper that presses the workpiece mounting base toward the base;
A plurality of jacks provided at at least three locations between the work mounting base and the base, and lifting the work mounting base against the base against the pressing force of the clamper;
Based on the target inclination of the reference surface of the work and the actual inclination of the reference surface of the work attached to the work mounting base, the inclination of the reference surface of the work is adjusted to the target inclination. A control device for controlling the amount of increase of the plurality of jacks;
A machine tool characterized by comprising: A workpiece measuring device for measuring X, Y and Z-axis coordinate values for a plurality of points on the reference surface of the workpiece mounted on the workpiece mount;
The control device calculates the actual inclination of the reference plane of the workpiece attached to the workpiece mounting base based on the X, Y, and Z axis coordinate values of the plurality of points input from the workpiece measuring device. The machine tool according to claim 1, wherein the machine tool is calculated. Each of the plurality of jacks is
A motor,
A screw shaft rotated by the motor;
A first wedge member translated by the screw shaft, the first wedge member including a first sliding surface inclined with respect to a translation direction of the first wedge member;
A second wedge member fixed to the work mounting base, wherein the second wedge member includes a second sliding surface slidably in contact with the first sliding surface, and is raised or lowered by the first wedge member; A second wedge member,
The machine tool according to claim 1, comprising:   The machine tool according to claim 1, wherein the work mounting base has a swivel base for turning the work around a vertical first axis.   The machine tool according to claim 1, wherein the workpiece mounting base includes a fixing device for removably fixing a pallet to which the workpiece is mounted.   A plurality of displacement sensors, each of which is associated with one of the plurality of jacks and attached to at least one of the base and the work mounting base, and the work mounting to the base at the mounting position The machine tool according to claim 1, further comprising a plurality of displacement sensors for detecting the position of the platform. In the X, Y and Z axis machine coordinate systems, a method for adjusting the tilt of a work mounting base of a machine tool,
The machine tool is
The base,
The workpiece mounting base provided above the base;
A clamper that presses the workpiece mounting base toward the base;
A plurality of jacks provided at at least three locations between the work mounting base and the base, and lifting the work mounting base against the base against the pressing force of the clamper;
Comprising
The method is
Attaching the workpiece to the workpiece mounting base;
A step of pressing the work mounting base toward the base by the clamper;
Obtaining an actual inclination of a reference plane of the workpiece attached to the workpiece mounting base;
Based on the target inclination of the reference surface of the work and the actual inclination of the reference surface of the work attached to the work mounting base, the inclination of the reference surface of the work is adjusted to the target inclination. And lifting the work mounting base with respect to the base against the pressing force of the clamper by the jack;
A method for adjusting the inclination of the work mounting table, characterized by comprising:   The method for adjusting the inclination of the work mounting base according to claim 7, wherein an upper limit value is provided for a single raising amount of the jack in the step of lifting the work mounting base with respect to the base.   Returning the plurality of jacks to an initial position, wherein the plurality of jacks are moved to a predetermined height above the initial position; and the plurality of jacks are moved from the predetermined height to the initial position. The method according to claim 7, further comprising a step including lowering to a workpiece mounting position.

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