JP2021122927A - Automatic positioning device for process machine - Google Patents

Abstract

To provide a positioning device for process machine which can easily position the center of a processing object member on the center of a rotary table with high accuracy with a simple mechanism.SOLUTION: An upper rotary table for fixing a processing object member W is attached in a relatively displaceable manner to a lower rotary table 12. Two pushing mechanisms 16U, 16L for relatively displacing the upper rotary table with respect to the lower rotary table 12 are point-symmetrically arranged with respect to a lower rotary table center C2. Each coordinate for any three points P1, P2, P3 of the outer periphery of the processing object member W is acquired by a probe 18a, an eccentric distance L between the lower rotary table center C2 and a processing object member center CW and a deflection angle θ of a symmetric axis SL with a virtual center axis CL of the two pushing mechanisms 16U, 16L as a reference are calculated. The lower rotary table 12 is rotated by θ by a spindle 13a and the upper rotary table 11 is relatively moved on the lower rotary table by L by the two pushing mechanisms 16U, 16L.SELECTED DRAWING: Figure 6

Description

The present invention relates to an automatic positioning device for a processing machine, and more specifically, to a positioning device for a processing machine capable of easily positioning the center of a member to be machined to the center of a rotary table as a reference by a simple mechanism.

As a positioning mechanism for the workpiece to be machined, a reference table that is driven to rotate, a movable table that can be displaced relative to the reference table and the workpiece is fixed, and a horizontal movement mechanism that moves the movable table in the horizontal direction are provided. Automatic centering devices are known (see, for example, Patent Documents 1 and 2). The movable table can be fixed (locked) / released (free) to the reference table by flood control. Further, when the movable table is displaced relative to the reference table, air pressure is supplied to the joint between the movable table and the reference table to raise the movable table from the reference table so that friction does not occur.

On the other hand, regarding the centering method in the automatic centering device, "The touch probe is applied to one point on the inner peripheral surface or the outer peripheral surface of the work. Then, the work is rotated by rotating the reference table, and the eccentricity of the work is determined. The rotation angle as the eccentric direction of the work is measured. At this time, the rotation angle of the reference table and the displacement amount of the touch probe are associated with each other and sequentially stored in the memory connected to the CPU for one round of the reference table. (For example, see [0087] in Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-194530 JP-A-2019-7949

In the automatic centering device described in Patent Document 1, in order to measure the eccentricity amount and the eccentric direction of the work, it is necessary to acquire the coordinate data for one circumference of the inner peripheral surface or the outer peripheral surface of the work by the touch probe. ..

Then, the control part of the CPU rotates the reference table so that the direction in which the misalignment is greatest faces the horizontal movement mechanism, and operates the horizontal movement mechanism so as to reduce the misalignment to perform centering control. (See [089] to [093] of Patent Document 1).

However, when the outer diameter of the work is large, there is a problem that the measurement takes time and a large capacity memory for storing the measurement data is required. Further, since the reduction of the maximum misalignment and the coincidence between the center of the work and the center of the reference table are not necessarily the same value, it is considered that there is room for further improvement in the positioning accuracy.

Further, an air supply path and an air pump for raising the movable table from the reference table, and a hydraulic supply path and a hydraulic pump for fixing the movable table to the reference table are separately required. As a result, each mechanism of the movable table and the reference table becomes complicated, and there is a problem that the manufacturing cost of the entire apparatus increases.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is a processing machine capable of easily positioning the center of a member to be machined at the center of a rotary table with a simple mechanism. To provide a positioning device for.

In the positioning device for a processing machine according to the present invention for achieving the above object, a first rotary table (11) for fixing a member (W) to be machined and the first rotary table (11) are placed and the first rotary table (11) is placed. The second rotary table (12) that makes the rotary table (11) relatively displaceable, the table rotary drive means (13a) that rotationally drives the second rotary table (12), and the first rotary table (11). Coordinates for measuring coordinates of a plurality of extrusion means (16U, 16L) that are joined to displace the first rotary table (11) relative to the second rotary table (12) and the member (W) to be machined. The rotation amount (θ) of the second rotary table (12) and the extrusion means (16U,) from the respective coordinates of the measuring means (18a) and the workpiece member (W) acquired from the coordinate measuring means (18a). The processing machine positioning device (10) including a drive amount calculating means for calculating the extrusion amount (L, L0) of 16L), and the plurality of extrusion means (16U, 16L) are the second. It is characterized in that it is arranged point-symmetrically with respect to the center (C2) of the rotary table (12).

In the above configuration, the virtual center axes (CL) of the extrusion means (16U, 16L) arranged point-symmetrically coincide with each other and pass through the center (C2) of the second turntable (12). Therefore, when the center of the member to be machined (CW) is located on the virtual center axis (CL) of the extrusion means (16U, 16L), the extrusion means (16U, 16L) moves the first rotary table (11) by a predetermined distance. By displacing only (L) on the second turntable (12), the center of the member to be machined (CW) can be easily positioned at the center of the second turntable (C2).

The center of the member to be machined (CW) can be positioned on the virtual center axis (CL) by rotating the second rotary table (12) by a predetermined angle (θ) by the table rotation driving means (13a). .. That is, the second turntable (12) is rotated by a predetermined angle (θ), and the first turntable (11) is relatively displaced on the second turntable (12) by a predetermined distance (L). The center of the member to be machined (CW) can be positioned at the center of the second turntable (C2) by only two operations.

The second feature of the positioning device for a processing machine according to the present invention is that the top plate (11a, 12a) and the bottom plate (11b, 12b) of the first rotary table (11) and the second rotary table (12) are provided. It has a notched structure and has a hollow plate bone structure inside.

In the above configuration, the notch structure reduces the contact area at the joint between the first turntable (11) and the second turntable (12). Further, the hollow structure of the plate bone reduces the moments of inertia of the first rotary table (11) and the second rotary table (12). As a result, the first rotary table (11) can be easily displaced relative to the second rotary table (12) by the extrusion means (16U, 16L), and the second rotary table (12) can be easily displaced by the table rotation drive means (13a). ) Is easy to rotate.

The third feature of the positioning device for a processing machine according to the present invention is that the drive amount calculating means calculates the coordinates (X _CW , Y _CW ) of the center of the member to be machined (CW), and the center of the member to be machined (X CW, Y CW). The member to be machined based on the eccentric distance (L) between the CW) and the center (C2) of the second rotary table (12) and the virtual center axis (CL) of the extrusion means (16U, 16L). The deviation angle (θ) with respect to the axis of symmetry (SL) of the member (W) to be processed passing through the center (CW) is calculated, and the table rotation driving means (13a) calculates the deviation angle (θ) by the table rotation driving means (13a). The two rotary tables (12) are rotated, and the first rotary table (11) is displaced relative to the second rotary table (12) by the eccentric distance (L) by the extrusion means (16U, 16L). Is.

In the above configuration, the second rotary table (12) is rotated by the deviation angle (θ) based on the calculated eccentric distance (L) between the centers and the deviation angle (θ) about the axis of symmetry (SL). The center of the member to be machined (CW) is changed to the center of the second turntable (C2) only by causing the first turntable (11) to be relatively displaced on the second turntable (12) by the eccentric distance (L). It is possible to position with high accuracy.

The fourth feature of the positioning device for a processing machine according to the present invention is that in the driving amount calculating means, the axis of symmetry (SL) of the member (W) to be processed is the center (C2) of the second rotary table (12). If not passing through, the deviation amount between the center (C2) of the intersection of axis of symmetry (SL) intersects the virtual central axis (CL) _{(Y CP, P CL)} and said second rotary table (12) ( L0, L0') is calculated, and the first rotary table (11) is displaced relative to the second rotary table (12) by the deviation amount (L0, L0') by the extrusion means (16U, 16L). That is.

In the above configuration, the member (W) to be machined is displaced by the extrusion means (16U, 16L) by the amount of deviation (L0) relative to the second rotary table (12). The axis of symmetry (SL) of can always pass through the center (C2) of the second turntable (12). As a result, even when the member (W) to be processed is elliptical or rectangular, the second rotary table (12) is rotated by the eccentric angle (θ), and the first rotary table (11) is eccentric. The center of the member to be machined (CW) can be accurately positioned at the center of the second rotary table (C2) only by the two operations of relative displacement on the second rotary table (12) by (L).

The fifth feature of the positioning device for a processing machine according to the present invention is that the virtual central axis (CL) of the extrusion means (16U, 16L) is a coordinate reference axis (Y axis) of any of the measurement coordinate systems of the processing machine. It is set to match.

In the above configuration, the coordinates (X _CW , Y _CW ) of the center of the member to be machined (CW), the eccentric distance (L) between the center of the member to be machined (CW) and the center (C2) of the second turntable (12). , The deviation angle (θ) with respect to the axis of symmetry (SL) of the member (W) to be processed with respect to the virtual center axis (CL) of the extrusion means (16U, 16L), and the axis of symmetry (SL) is the virtual center axis (CL). ) amount of deviation between the center (C2) of the intersection _{(Y CP)} and the second rotary table (12) intersecting the (L0) each calculating the like can be facilitated.

According to the positioning device for a processing machine of the present invention, it is possible to easily position the center of the member to be processed to the center of the rotary table as a reference with high accuracy by a simple mechanism.

It is a front view of the processing machine which concerns on one Embodiment of this invention. It is a top view of the processing machine which concerns on one Embodiment of this invention. It is sectional drawing of the main part which shows the table part which concerns on this invention. It is explanatory drawing which shows the upper rotary table which concerns on this invention. It is explanatory drawing which shows the lower rotary table which concerns on this invention. It is explanatory drawing which shows the main part of the positioning mechanism of a table part. It is explanatory drawing which shows the state which the lower rotary table is rotated counterclockwise by the declination by the spindle. It is explanatory drawing which shows the state which pushed out the 1st pushing piece of the 1st pushing mechanism by an eccentric distance. It is explanatory drawing which shows the positioning procedure of the member to be processed which has an elliptical cross-sectional shape. It is explanatory drawing which shows the state which pushed out the 1st push piece of the 1st push mechanism only by the Y section of a long axis. It is explanatory drawing which shows the positioning procedure of the member to be processed which has a rectangular cross-sectional shape. It is explanatory drawing which shows the positioning procedure of the member to be processed when the virtual center axis and the coordinate reference axis (X-axis, Y-axis) do not match. It is explanatory drawing which shows the positioning procedure of the member to be processed when the virtual center axis and the coordinate reference axis (X axis, Y axis) do not match, and the symmetry axis SL does not pass through the origin (the center of the lower rotary table). ..

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are explanatory views showing a processing machine 100 according to an embodiment of the present invention. FIG. 1 is a front view of the processing machine 100, and FIG. 2 is a plan view of the processing machine 100.

As shown in FIG. 1, the processing machine 100 includes a table portion 10 that positions a member W (not shown) at a predetermined position, and a processing head portion 2 that processes the member W to be processed into a predetermined shape. The X-axis moving mechanism 3 that moves the machining head portion 2 in the X-axis direction, the Y-axis moving mechanism 4 that moves the machining head portion 2 in the Y-axis direction, and Z that moves the machining head portion 2 in the Z-axis direction. A shaft moving mechanism 5, a gantry portion 6 accommodating these moving mechanisms 3, 4 and 5, a strut portion 7 supporting the gantry portion 6, a tool magazine 8 accommodating a plurality of cutting tools (not shown), and a tool magazine 8. It is configured to include an operation panel 9 for the operator to input machining conditions. The table unit 10 will be described later with reference to FIG.

The machining head portion 2 is provided with a spindle (not shown) that rotates a cutting tool (not shown) at a predetermined speed (for example, up to 20000 rpm), and a cutting tool (not shown) is attached to the tip of the rotating shaft (spindle) of the spindle. A chuck (not shown) for gripping (not shown) is provided.

The processing head portion 2 can be tilted within a predetermined angle range (for example, within a range of ± 90 °) along a predetermined vertical plane (hereinafter referred to as “A axis”) of the spindle spindle. Further, the main axis can rotate within a predetermined angle range (for example, within a range of ± 270 °) along a predetermined horizontal plane (hereinafter referred to as “C axis”). Further, the processing portion head portion 2 can move over the three axes of the X-axis, the Y-axis, and the Z-axis on the drawing.

As shown in FIG. 2, the X-axis moving mechanism 3 is driven by an AC servomotor (not shown), has a moving distance (stroke) of, for example, 3000 mm, and can move at a feed rate of 30 m / min. ..

As shown in FIG. 1, the Y-axis moving mechanism 4 is driven by an AC servomotor (not shown), has a moving distance (stroke) of, for example, 3000 mm, and can move at a feed rate of 30 m / min. ..

As shown in FIG. 1, the Z-axis moving mechanism 5 is driven by an AC servomotor (not shown), has a moving distance (stroke) of, for example, 1000 mm, and can move at a feed rate of 20 m / min. ..

The operation panel 9 is composed of, for example, a liquid crystal touch panel, and the operator inputs processing conditions and the like with a finger, a keyboard, or the like.

FIG. 3 is a cross-sectional explanatory view of a main part showing the table part 10 according to the present invention. The member W to be fixed is also shown in the drawing. The table portion 10 is integrated with the upper rotary table 11 for fixing the member W to be machined, the lower rotary table 12 which is joined to the upper rotary table 11 and can be relatively displaced, and the lower rotary table 12 to rotate the lower rotary table 12. A table rotation drive unit 13 to be operated, a bolt 14 inserted through a through hole 11e of the upper rotation table 11 to fasten the upper rotation table 11 and the lower rotation table 12, and a washer 15 for increasing the working area of the fastening force of the bolt 14. , The pushing mechanism 16 that moves (slides) the upper rotary table 11 relative to the lower rotary table 12 by the pushing piece 16a, the support base 17 that supports the pushing mechanism 16, and the position of the member W to be machined on the processing machine 100. It is composed of a position sensor 18 for measuring (coordinates), a first distance sensor 19U and a second distance sensor 19L (FIG. 6) for measuring the slide amount of the upper rotation table 11.

In the upper rotary table 11, the top plate 11a and the bottom plate 11b have a notched structure, and the internal structure supporting the top plate 11a and the bottom plate 11b forms a hollow plate bone (plate rib) structure. The plate bones are radially provided between the four circumferential rib plates 11c1, 11c2, 11c3, 11c4 provided concentrically along the circumferential direction, and the first circumferential rib plate 11c1 and the second circumferential rib plate 11c2. The first radial rib plate 11d1 provided, the second radial rib plate 11d2 radially provided between the second circumferential rib plate 11c2 and the third circumferential rib plate 11c3, and the third circumferential rib. It is composed of a third radial rib plate 11d3 radially provided between the plate 11c3 and the fourth circumferential rib plate 11c4.

Further, the top plate 11a has a circular notch portion 11ac and a 1/4 circular notch portion 11aq. The bottom plate 11b has an annular notch 11br and a semi-fan-shaped notch 11bs. Therefore, the upper rotary table 11 is significantly reduced in weight as a whole while ensuring sufficient strength and rigidity by the notch structure and the hollow plate bone structure.

In the lower rotary table 12, the top plate 12a and the bottom plate 12b have a notched structure, and the internal structure supporting the top plate 12a and the bottom plate 12b forms a hollow plate bone (plate rib) structure. The plate bones are radially provided between the four circumferential rib plates 12c1, 12c2, 12c3, 12c4 provided concentrically along the circumferential direction, and the first circumferential rib plate 12c1 and the second circumferential rib plate 12c2. The first radial rib plate 12d1 provided, the second radial rib plate 12d2 radially provided between the second circumferential rib plate 12c2 and the third circumferential rib plate 12c3, and the third circumferential rib. It is composed of a third radial rib plate 12d3 provided radially between the plate 12c3 and the fourth circumferential rib plate 12c4.

Further, the top plate 12a has a circular notch, an annular notch, and a plurality of semi-fan-shaped notches. The bottom plate 12b has a circular notch and an annular notch. Therefore, the lower rotary table 12 is significantly reduced in weight as a whole while ensuring sufficient strength and rigidity by the notch structure and the hollow plate bone structure. Details of the upper rotary table 11 and the lower rotary table 12 will be described later with reference to FIGS. 4 and 5.

The maximum outer diameter of the shaft portion of the bolt 14 for fastening the upper rotary table 11 and the lower rotary table 12 is smaller than the inner diameter of the through hole 11e provided in the bottom plate 11b of the upper rotary table 11. Therefore, when a load in the horizontal direction (horizontal direction) is applied to the upper rotary table 11, the upper rotary table 11 can be moved (sliding) relative to the lower rotary table 12.

The table rotation drive unit 13 is concentrically coupled to the lower rotation table 12 in a rigid manner, and transmits the rotational force of the spindle 13a to the lower rotation table 12. Further, the table rotation drive unit 13 includes a brake mechanism (not shown), and the lower rotation table 12 is held in a stationary state by the braking force of the brake mechanism.

The pushing mechanism 16 is joined to the peripheral end of the bottom plate 11b of the upper rotary table 11 by the pushing piece 16a. In this embodiment, the two pushing mechanisms 16 and 16 are arranged point-symmetrically with respect to the center C2 of the lower rotary table 12. A first distance sensor 19U and a second distance sensor 19L (FIG. 6) for measuring the slide amount of the upper rotary table 11 are arranged in parallel with the push-in piece 16a.

The position sensor 18 is a contact-type position sensor that is attached to the processing head portion 2 and used. The coordinate system related to the measurement is the coordinate system of the processing machine 100. The positioning of the workpiece W (upper rotary table 11) using the position sensor 18 and the pushing mechanism 16 will be described later with reference to FIGS. 6 to 11.

FIG. 4 is an explanatory view showing the upper rotary table 11 according to the present invention. FIG. 4A is a plan view, and FIG. 4B is a bottom view.

As shown in FIG. 4A, a circular notch 11ac is formed in the central portion of the top plate 11a, and four 1/4 circular notches 11aq are formed around the circular notch 11ac. Further, as shown in FIG. 3, the central portion of the top plate 11a forms a recess (inro portion) lower than other portions.

As shown in FIG. 4B, a circular notch 11bc is formed in the center of the bottom plate 11b, an annular notch 11br is formed around the notch, and twelve halves are further formed around the circular notch 11br. A fan-shaped notch portion 11bs is formed. Further, eight through holes 11e through which bolts 14 (FIG. 3) are inserted are formed on the outer surface of the bottom plate 11b.

Regarding the hollow structure of the internal plate bone, the first circumferential rib plate 11c1 (FIG. 3) is formed concentrically along the radial outer side, and the second circumferential rib plate 11c2 and the third circumferential rib plate 11c3 are formed. And the fourth circumferential direction rib plate 11c4 (FIG. 3) are provided in order.

Between the first circumferential rib plate 11c1 and the second circumferential rib plate 11c2, the first radial rib plate 11d1 is provided at intervals of 30 ° radially from the center C1 of the upper rotary table. Similarly, between the second circumferential rib plate 11c2 and the third circumferential rib plate 11c3, the second radial rib plate 11d2 is provided at intervals of 10 ° radially from the center C1 of the upper rotary table. Similarly, between the third circumferential rib plate 11c3 and the fourth circumferential rib plate 11c4 (FIG. 3), the third radial rib plate 11d3 is provided at intervals of 10 ° radially from the center C1 of the upper rotary table. ing.

FIG. 5 is an explanatory view showing a lower rotary table 12 according to the present invention. FIG. 5A is a plan view, and FIG. 5B is a bottom view.

As shown in FIG. 5A, a circular notch 12ac is formed in the central portion of the top plate 12a, an annular notch 12ar is formed around the circular notch, and 12 are further formed around the annular notch 12ar. A semi-fan-shaped notch 12as is formed. Further, eight female screw portions 11f to which the bolts 14 are screwed are formed on the surface of the top plate 12a.

As shown in FIG. 5B, a circular notch portion 12bc is formed in the central portion of the bottom plate 12b, and an annular notch portion 12br is formed around the circular notch portion 12bc.

Returning to FIG. 5A, with respect to the hollow structure of the internal plate bone, the first circumferential rib plate 12c1 (FIG. 3) is formed concentrically along the radial outer side, and the second circumferential rib plate is formed. 12c2, a third circumferential rib plate 12c3, and a fourth circumferential rib plate 12c4 (FIG. 3) are provided in this order.

Between the first circumferential rib plate 12c1 and the second circumferential rib plate 12c2, the first radial rib plate 12d1 is provided at intervals of 30 ° radially from the center C2 of the lower rotary table. Similarly, between the second circumferential rib plate 12c2 and the third circumferential rib plate 12c3, the second radial rib plate 12d2 is provided radially from the lower rotary table center C2 at intervals of 15 ° or 30 °. ing. Similarly, between the third circumferential rib plate 12c3 and the fourth circumferential rib plate 12c4 (FIG. 3), the third radial rib plate 12d3 is radially spaced from the lower rotary table center C2 at 15 ° intervals or 30 °. It is provided at intervals. Further, between two adjacent third radial rib plates 12d3 and 12d3, fourth radial ribs 12d4 are provided radially from the lower rotary table center C2 at 5 ° intervals or 10 ° intervals.

Due to the notch structure of the bottom plate 11b shown in FIG. 4B and the notch structure of the top plate 12a shown in FIG. 5A, the friction area at the joint between the upper rotary table 11 and the lower rotary table 12 is small. You can see that. Therefore, when the pushing mechanism 16 pushes the upper rotary table 11 and slides the upper rotary table 11 with respect to the lower rotary table 12, the pushing force required for the pushing mechanism 16 can be small. This makes it possible to reduce the size and power consumption of the pushing mechanism 16.

FIG. 6 is an explanatory view showing a main part of the positioning mechanism of the table portion 10. The term "positioning" as used herein means that the center C2 of the lower rotary table is used as a reference point and the center CW of the member to be machined coincides with the center C2 of the lower rotary table. Further, it is assumed that the member W to be processed is fixed on the upper rotary table 11 (not shown).

The two pushing mechanisms 16U and 16L are arranged point-symmetrically with respect to the center C2 of the lower rotary table. Therefore, the virtual center axis CL of one pushing mechanism and the virtual center axis CL of the other pushing mechanism coincide with each other, and the virtual center axis CL passes through the lower rotary table center C2. Here, for convenience of explanation, the virtual center axis CL is set as the Y axis of the coordinate system of the processing machine 100, the lower rotation table center C2 is set as the origin of the coordinate system, and the virtual axis orthogonal to the Y axis and passing through the lower rotation table center C2 is defined. It is the X-axis of the coordinate system. For example, when it is desired to slide the member W to be processed in the −Y direction, the first pressing piece 16aU of the first pressing mechanism 16U arranged in the + Y direction is pushed out in the −Y direction. On the contrary, when it is desired to slide the member W to be processed in the + Y direction, the second pushing piece 16aL of the second pushing mechanism 16L arranged in the −Y direction is pushed out in the + Y direction. The amount of movement of the member W to be processed along the virtual central axis CL is configured to be measured by the first distance sensor 19U or the second distance sensor 19L.

The member W to be machined can be rotated around the lower rotary table center C2 by the spindle 13a, and can be slid and moved along the virtual central axis CL by the two pushing mechanisms 16U and 16L. The positioning procedure using the spindle 13a and the two pushing mechanisms 16U and 16L will be described below. It is assumed that the cross-sectional shape of the member W to be processed is circular.

First, (1) the coordinates (X _CW , Y _CW ) of the center CW of the member to be processed are calculated. _{The coordinates (X CW} , Y _CW ) of the center CW of the member to be processed are calculated by bringing the probe 18a of the position sensor 18 into contact with arbitrary three points P1, P2, P3 on the outer peripheral surface of the member W to be processed (FIG. Not shown). The computer substitutes the three XY coordinates P1 (X1, Y1), P2 (X2, Y2), and P3 (X3, Y3) into the following equation 1 and solves the three simultaneous equations to solve the CW at the center of the member to be machined. Coordinates (X _CW , Y _CW ) and radius R are calculated.
(Equation 1): (XX _CW ) ² + (YY _CW ) ² = R ²

Next, (2) the eccentric distance L and the declination θ are calculated. The "eccentric distance" referred to here means the length from the center C2 of the lower rotary table to the center CW of the member to be processed. Further, the "deviation angle" means an inclination angle of the virtual straight line (symmetry axis SL) from the lower rotary table center C2 to the work member center CW with respect to the virtual center axis CL (Y axis). The eccentric distance L and the declination θ are calculated by the following equations 2 and 3, respectively.
(Equation 2): L = (X _CW ² + Y _CW ² ) ^0.5
(Equation 3): θ = cos ^-1 (Y _CW / L)

Next, (3) the lower rotary table 12 is rotated counterclockwise by the declination θ by the spindle 13a. FIG. 7 shows a state in which the lower rotary table 12 is rotated counterclockwise by the declination θ by the spindle 13a. As a result of rotating the lower rotation table center C2 (0.0) in the counterclockwise direction by a deviation angle θ, the symmetry axis SL coincides with the virtual center axis CL (Y axis), and the member center CW to be processed is Y. It will be located on the axis. Further, since the eccentric distance L does not change due to the rotation operation, the center CW of the member to be machined is located at the coordinates (0, L) on the Y axis.

Next, (4) the first pushing piece 16aU of the first pushing mechanism 16U is pushed out by a distance L. FIG. 8 shows a state in which the first pushing piece 16aU of the first pushing mechanism 16U is pushed out by the eccentric distance L. As a result of sliding the member W to be processed by the eccentric distance L on the Y axis, the center CW of the member to be processed coincides with the center C2 of the lower rotary table.

As described above, regarding the positioning of the member W to be processed having a circular cross-sectional shape, first (1) the coordinates (X _CW , Y _CW ) of the center CW of the member to be processed are calculated, and then (2) the reference point (below). The eccentric distance L and the eccentricity θ with respect to the rotary table center C2) are calculated, (3) the lower rotary table 12 is rotated so that the eccentricity θ becomes zero by the spindle 13a, and (4) the first pushing mechanism 16U or By sliding the upper rotary table 11 with respect to the lower rotary table 12 so that the eccentric distance L becomes zero by the second pushing mechanism 16L, the workpiece center CW of the workpiece W can be easily moved to the lower rotary table center C2. Can be positioned to. The positioning method according to the present invention can be applied to an axisymmetric figure (a figure having a symmetry axis SL) such as an ellipse or a rectangle in addition to a circle having a cross-sectional shape. The positioning procedure for the member W to be machined having an elliptical cross-sectional shape will be described below.

FIG. 9 is an explanatory view showing a positioning procedure of the member W to be processed having an elliptical cross-sectional shape. Note that FIG. 9B is an explanatory diagram showing a general definition of an ellipse.
First, (1') the axis of symmetry SL of the member W to be machined is calculated. The semimajor axis LA can be selected as the elliptical axis of symmetry SL. The "long axis" of the ellipse is a virtual central axis passing through the first focal point F1 and the second focal point F2. Further, as shown in Equation 4 below, the equation of the ellipse is "a moving point P (x, y) in which the sum of the distances from the two fixed points (first focal point F1 and second focal point F2) is constant (= C). Defined as "trajectory".
(Equation 4): {(x-a1) ² + (y-b1) ² } ^0.5 + {(x-a2) ² + (y-b2) ² } ^0.5 = C
Therefore, using the above equation 4, the coordinates (a1, b1) of the first focal point F1 and the coordinates (a2, b2) of the second focal point F2 of the member W to be processed are calculated.

In Equation 4 above, the unknowns are a1, b1, a2, b2 and C, so it is necessary to create five simultaneous equations. Therefore, the probe 18a causes XY coordinates P1 (X1, Y1), P2 (X2, Y2), P3 (X3, Y3), P4 (X4, Y4) and P5 at any five points on the outer peripheral surface of the member W to be processed. It is necessary to acquire (X5, Y5).

The computer substitutes the five XY coordinates P1 (X1, Y1), P2 (X2, Y2), P3 (X3, Y3), P4 (X4, Y4) and P5 (X5, Y5) into the above equation 4. By solving the five simultaneous equations, the coordinates (a1, b1) of the first focal point F1 and the coordinates (a2, b2) of the second focal point F2 of the member W to be processed are calculated.

Next, (2') Y-intercept L0 of the long axis LA (symmetry axis SL) of the member W to be processed is calculated. The Y-intercept L0 is calculated by substituting X = 0 in the equation of the long axis LA shown in the following equation 5.
(Equation 5): Y-b1 = (b2-b1) / (a2-a1) * (X-a1)
(Equation 5'): L0 = (a2 * b1-a1 * b2) / (a2-a1)

Next, (3') the first pushing piece 16aU of the first pushing mechanism 16U is pushed out by the Y-intercept L0 of the long axis LA. As a result, as shown in FIG. 10, the long axis LA passes through the center C2 of the lower rotary table. Further, the coordinates of the first focal point F1 change to (a1, b1-L0). Further, the coordinates of the second focal point F2 change to (a2, b2-L0). Therefore, the coordinates of the center CW of the member to be processed also change to ((a1 + a2) / 2, (b1 + b2) / 2-L0).

Therefore, for the subsequent processing, by executing the above processes (2) to (4), the center CW of the member to be machined can be made to coincide with the center C2 of the lower rotary table for the member W to be machined having an elliptical cross-sectional shape. can. When positioning the work member W whose cross-sectional shape is not circular in this way, (1') the symmetry axis SL for the work member W is calculated, and then (2') the Y-intercept L0 of the symmetry axis SL is set. By calculating and sliding the upper rotary table 11 by the first pushing mechanism 16U or the second pushing mechanism 16L so that the Y-intercept L0 of the (3') axis of symmetry SL becomes zero, the cross-sectional shape is circular. It can be performed in the same manner as the positioning of the processed member W.

FIG. 11 is an explanatory view showing a positioning procedure of the member W to be processed having a rectangular cross-sectional shape.
First, (1 ") the symmetry axis SL of the member W to be processed is calculated. The rectangular symmetry axis SL is calculated by acquiring the XY coordinates P1, P2, P3, and P4 of the four corners. The midpoint MP1 coordinates ((X1 + X2) / 2, (Y1 + Y2) / 2) are calculated from the coordinates of (X1, Y1) and the points P2 (X2, Y2). Also, the points P3 (X3, Y3) and the points The midpoint MP4 coordinates ((X3 + X4) / 2, (Y3 + Y4) / 2) are calculated from the coordinates of P4 (X4, Y4). The corners are detected, for example, as points where the inclination of the straight line changes. be able to.

As a result, the equation of the axis of symmetry SL is calculated as shown in Equation 6 below. The Y-intercept L0 is calculated by substituting X = 0 in the equation of the axis of symmetry SL shown in the following equation 6. The coordinates of the center CW of the member to be processed are ((X1 + X2 + X3 + X4) / 4, (Y1 + Y2 + Y3 + Y4) / 4).
(Equation 6): Y- (Y1 + Y2) / 2 = (Y1 + Y2-Y3-Y4) / (X1 + X2-X3-X4) {X- (X1 + X2) / 2}
(Equation 6'): L0 = {(X1 + X2) (Y3 + Y4)-(X3 + X4) (Y1 + Y2)} / 2 * (X1 + X2-X3-X4)

Therefore, by executing the above-mentioned (3') and the above-mentioned (2) to (4) for the subsequent processing, the machined member W having a rectangular cross-sectional shape can also be turned down on the machined member center CW. It can be aligned with the center C2.

Although one embodiment of the present invention has been described above with reference to the drawings, the embodiment of the present invention is not limited to the above. That is, it is possible to add various modifications and improvements within the technical scope of the present invention. For example, as shown in FIG. 12, the present invention can be applied even when the virtual central axis CL and the coordinate reference axes (X-axis and Y-axis) do not match. In this case, the declination θ formed by the virtual center axis CL and the axis of symmetry SL is a unit vector V _CL = (sinδ, cosδ) having a magnitude of 1 with respect to the virtual center axis CL, as shown in the following equations 7 and 7'. It is calculated by taking the inner product (.) Of the _{vector V CW} = (X _CW , Y _CW ) connecting the origin (0,0) and the center CW of the member to be processed. The eccentric distance L remains the same. Therefore, it can be performed in the same manner as the positioning of the member W to be processed having a circular cross-sectional shape.
(Equation 7): V _CL · V _CW = | V _CL | * | V _CW | * cosθ
(Equation 7'): θ = cos ^-1 (V _CL · V _CW / | V _CL | * | V _CW |) = cos ^-1 {(X _CW * sinδ + Y _CW * cosδ) / L}

Similarly, as shown in FIG. 13, when the virtual center axis CL and the coordinate reference axes (X-axis, Y-axis) do not match, and the symmetry axis SL does not pass through the origin (lower rotation table center C2). The present invention is also applicable to the above. In this case, by obtaining the intersection point P _CL axis of symmetry SL intersect the imaginary center axis CL, the cross-sectional shape can be performed in the same manner as the positioning of the workpiece W which is a circular shape. That is, by sliding the upper turntable 11 by the distance L0 extending from the origin to the intersection P _CL '(the displacement amount) first pushing mechanism 16U, similarly to the positioning of the workpiece W which is the cross-sectional shape is circular It can be carried out. The intersection P _CL is calculated as a solution of a simultaneous equation of the equation of the virtual center axis CL and the equation of the symmetry axis SL. Incidentally, the equation of the virtual center axis CL has the unit vector V _CL = (sinδ, cosδ) in the direction vector and passes through the origin, so that it is calculated as shown in the following equation 8. Further, the equation of the axis of symmetry SL is calculated as shown in the above equation 5.
(Equation 8): Y = X * (cosδ / sinδ) = X / tanδ

The calculation process for obtaining the declination angle θ, the eccentric distance L, the deviation amount L0, L0'and the like is an example, and is not limited to the above.

2 Machining head part 3 Z-axis movement mechanism 4 Y-axis movement mechanism 5 X-axis movement mechanism 6 Guntry part 7 Strut 8 Operation panel 10 Table part 11 Upper rotation table 12 Lower rotation table 13 Table rotation drive part 14 Bolt 15 Washer 16 Pushing mechanism 16U 1st push-in mechanism 16L 2nd push-in mechanism 17 Support base 18 Position sensor 18a Probe 19U 1st distance sensor 19L 2nd distance sensor 100 Processing machine

Claims (5)

The first rotary table (11) for fixing the member to be machined (W) and
A second turntable (12) on which the first turntable (11) is placed and the first turntable (11) can be relatively displaced.
A table rotation driving means (13a) that rotationally drives the second rotary table (12), and
A plurality of extrusion means (16U, 16L) that are joined to the first rotary table (11) to displace the first rotary table (11) relative to the second rotary table (12).
The coordinate measuring means (18a) for measuring the coordinates of the member (W) to be processed, and
The amount of rotation (θ) of the second rotary table (12) and the amount of extrusion (L) of the extruding means (16U, 16L) from each coordinate of the member (W) to be processed obtained from the coordinate measuring means (18a). , L0) is a processing machine positioning device (10) provided with a drive amount calculating means for calculating each of the above.
A positioning device for a processing machine, wherein the plurality of extrusion means (16U, 16L) are arranged point-symmetrically with respect to the center (C2) of the second rotary table (12). In the positioning device for a processing machine according to claim 1,
Regarding the first turntable (11) and the second turntable (12), the top plate (11a, 12a) and the bottom plate (11b, 12b) have a notch structure, and the inside has a plate bone hollow structure. A positioning device for processing machines, which is characterized by this. In the positioning device for a processing machine according to claim 1 or 2.
_{The drive amount calculating means calculates the coordinates (X CW} , Y _CW ) of the center (CW) of the member to be processed, and obtains the coordinates (X CW, Y CW).
The eccentric distance (L) between the center (CW) of the member to be processed and the center (C2) of the second rotary table (12),
Declination (θ) with respect to the axis of symmetry (SL) of the member to be machined (W) passing through the center of the member to be machined (CW) with respect to the virtual center axis (CL) of the extrusion means (16U, 16L). Are calculated respectively,
The second rotary table (12) is rotated by the deviation angle (θ) by the table rotation driving means (13a), and the first rotary table is rotated by the eccentric distance (L) by the extrusion means (16U, 16L). A positioning device for a processing machine, characterized in that (11) is displaced relative to the second rotary table (12). In the positioning device for a processing machine according to claim 3,
When the axis of symmetry (SL) of the member (W) to be machined does not pass through the center (C2) of the second rotary table (12), the drive amount calculating means causes the axis of symmetry (SL) to be the virtual center axis. The amount of deviation (L0, L0') between the intersection (Y _CP , P _CL ) intersecting (CL) and the center (C2) of the second turntable (12) is calculated.
Positioning for a processing machine, wherein the first rotary table (11) is displaced relative to the second rotary table (12) by the amount of deviation (L0, L0') by the extrusion means (16U, 16L). Device. In the positioning device for a processing machine according to any one of claims 1 to 4.
The processing machine is characterized in that the virtual central axis (CL) of the extrusion means (16U, 16L) is set to match any coordinate reference axis (Y axis) of the measurement coordinate system of the processing machine. Positioning device for.

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