Centering device and centering method

Abstract

To provide a centering device which has a tilt correction function with a simple structure.SOLUTION: A centering device 10 includes: a table frame 13; a support shaft 15; an inclined base 17 which is supported in a rotatable manner by the support shaft 15; a jack device 36 which raises a point of action 35 with respect to the table frame 13; a rotary table 23 which is supported in a rotatable manner by the inclined base 17 around a rotational axis 1 extending in the vertical direction; a table lifter 25 which is arranged on the rotary table 23; a float table 27 which is placed above the table lifter 25 and moves freely in the left-right direction and front-rear direction when the table lifter 25 raises the float table 27, and whose movement is limited when the float table 27 is lowered; and a center alignment device 55 which aligns a center axis 3b with the rotational axis 1 by bringing a contact part 64 into contact with a rotation surface 3a when the float table 27 is raised.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a centering device and a centering method. [Background technology]

[0002] BACKGROUND ART A centering device is known that has a rotary table on which a workpiece is placed, tilting means and moving means for the rotary table, and workpiece positioning means (Japanese Patent No. 4450468, hereinafter referred to as Patent Document 1). Summary of the Invention [Problem to be solved by the invention]

[0003] The centering device of Patent Document 1 has a complex structure. Furthermore, when a workpiece is placed on the turntable, if the center of the workpiece does not coincide with the center of the turntable, the workpiece needs to be moved relative to the turntable.

[0004] SUMMARY OF THE INVENTION An object of the present invention is to provide a centering device having a simple structure and a tilt correction function. Another object of the present invention is to provide a centering device that can easily align the center of a workpiece with the center of a rotary table. [Means for solving the problem]

[0005] A first aspect of the present invention is A workpiece centering device having a rotation surface and a central axis, Table frame and a support shaft disposed on the table frame; a tilting base rotatably supported on the support shaft; a jack device disposed on the table frame and configured to raise a point of application spaced apart from the support shaft relative to the table frame; a rotary table supported on the tilting base so as to be rotatable about a rotation axis extending in a vertical direction; a table lifter disposed on the rotary table; a float table that is placed above the table lifter and on which the workpiece can be placed, the float table being movable freely in the left-right and front-rear directions when the float table is raised by the table lifter, and having its movement restricted when the float table is lowered; a centering device having an abutment portion that abuts against the rotation surface when the float table is raised, thereby aligning the central axis with the rotation axis; The centering device has the following features.

[0006] A second aspect of the present invention is A workpiece having a rotation surface and a central axis is placed on a float table; a table lifter for lifting the float table from the rotary table; The center of the workpiece is aligned with the rotation axis of the rotary table, the table lifter lowers the float table onto the rotary table; The rotary table rotates, a length measuring device measures the position of the generatrix of the rotating rotation surface at two points in the height direction, and determines the tilt phase and tilt angle of the rotation axis; The tilt direction of the rotation surface is aligned with the support axis, which is the rotation center of the tilt table, in a direction that is vertical and horizontal, A jack device raises the point of application of the tilt table to make the central axis of the rotation surface upright. This is a method for centering a workpiece.

[0007] The table lifter is, for example, a ball lifter, a roller lifter, or an air lifter.

[0008] The centering device is, for example, a combination of an imaging device that captures an image of the periphery of the rotation surface, a computing device that calculates the center of the rotation surface from the image of the periphery of the rotation surface, and a robot that aligns the center of the rotation surface with the rotation axis and places the workpiece on the float table.The centering device may also be, for example, a chuck with a centering function that has multiple jaws that move and press radially toward the center.

[0009] The arm screw is disposed parallel to the support axis.

[0010] The centering device may be, for example, a combination of magnets arranged on the float table at equal distances from the center of the float table and magnets arranged at equal distances from the rotation axis. Alternatively, the centering device may be multiple elastic bodies extending in the radial direction that connect the rotary table and the float table.

[0011] The fixed posts and floating posts may be provided in equal numbers. The elastic body may be, for example, a tension spring, a compression spring, a rubber band, or a damper. The compression spring is used in conjunction with a guide.

[0012] The clamping device may include an air cylinder. The air cylinder may be a single-acting cylinder. The swivel shaft may include a second fixed port. The swivel housing may include a second rotating port. The swivel joint may include a second swivel passage connecting the second fixed port and the second rotating port. The centering device may include a third passage connecting the air source and the second fixed port and a fourth passage connecting the air cylinder and the second rotating port.

[0013] The point of application may be an axis extending parallel to the support axis, the jack guide and jack screw may extend horizontally, or the jack guide and jack screw may extend perpendicular to the support axis. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a centering device with a simple structure and a tilt correction function, and also to provide a centering device that can easily align the center of a workpiece with the center of a turntable. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a longitudinal sectional view of a centering device according to an embodiment of the present invention; [Figure 2] Cross section of line II-II in Figure 1 [Figure 3]1 is a fluid circuit diagram of an embodiment of a centering device; [Figure 4] Cross section of line IV-IV in Figure 1 [Figure 5] Flowchart showing the centering method of the embodiment [Figure 6A] 10A and 10B are cross-sectional views showing a method for determining an inclination angle in the centering method of the embodiment; [Figure 6B] 10A and 10B are cross-sectional views showing a method for determining an inclination angle in the centering method of the embodiment; [Figure 7] Plan view of the arm of the modified example DETAILED DESCRIPTION OF THE INVENTION

[0016] 1 and 2, the centering device 10 of this embodiment includes a table frame 13, a support shaft 15, an inclined table 17, a rotary table 23, a table lifter 25, a float table 27, a jack device 36, and a centering device 55. The centering device 10 may also include a frame guide 11, a swivel joint 53, a table rotation motor 19, a driving gear 21, a clamping device 28, a length measuring machine 51, and an air source 71 (see FIG. 3).

[0017] The upward direction in Fig. 1 is the +Z direction. The rightward direction in Fig. 2 is the +Y direction, and the downward direction in Fig. 2 is the +X direction. Fig. 1 is a cross-sectional view taken along line II in Fig. 2. However, in Fig. 1, the tilt table 17, the jack device 36, and the table frame 13 are shown in cross section along the YZ plane.

[0018] The workpiece 3 is placed on the float table 27. The workpiece 3 has a rotation plane 3a and a central axis 3b. The workpiece 3 is a rotating body centered on the central axis 3b. The central axis 3b may be inclined with respect to a line perpendicular to the installation surface of the float table 27. The centering device 10 corrects the posture of the workpiece 3 so that the central axis 3b is vertical. The centering device 10 is applied to, for example, the rim cutting device of Patent Document 1.

[0019] The frame guide 11 extends in the Y direction. The frame guide 11 is fixed. The frame guide 11 is a linear guide.

[0020] The table frame 13 is disposed on the frame guide 11. The table frame 13 reciprocates in the Y direction. The table frame 13 may be controlled by a linear motion system (not shown). The linear motion system is, for example, a rack and pinion mechanism or a ball screw and servo motor mechanism. The table frame 13 has a clevis base 13a, a motor bracket 13b, and a bearing base 13c. The clevis base 13a supports a support shaft 15. The support shaft 15 extends in the X direction.

[0021] The tilting base 17 has a clevis 17a, a fixed shaft 17b, and an action pin (point of action) 35. The clevis 17a is arranged on the underside of the tilting base 17. The clevis 17a is rotatably supported by the support shaft 15. The fixed shaft 17b is a hollow cylinder. The fixed shaft 17b extends upward perpendicular to the upper surface of the tilting base 17. The action pin 35 is arranged parallel to the X-axis, spaced apart from the support shaft 15. The action pin 35 is arranged on the underside of the tilting base 17.

[0022] The turntable 23 has a turntable plate 23a, a rotation shaft 23b, a support base 23c, a mounting base 23d, and a driven gear 23e. The turntable plate 23a is disk-shaped. The center of the turntable plate 23a may be hollowed out. The rotation shaft 23b is a hollow cylinder and is arranged below the turntable plate 23a. The rotation shaft 23b is supported by a fixed shaft 17b via a table bearing 24. The turntable 23 rotates around the rotation shaft 1. Multiple support bases 23c are arranged at equal intervals around the periphery of the upper surface of the turntable plate 23a. The support base 23c supports the mounting base 23d. The mounting base 23d is ring-shaped. The upper surface of the mounting base 23d is a plane perpendicular to the turntable shaft 23b. The driven gear 23e is arranged on the outer periphery of the turntable shaft 23b.

[0023] The table rotation motor 19 is disposed on the tilting base 17. The driving gear 21 is fastened to the output shaft of the table rotation motor 19. The driving gear 21 meshes with the driven gear 23e.

[0024] The table lifter 25 is an air-operated ball lifter. A plurality of table lifters 25 are arranged at equal intervals on the upper surface of the rotary table plate 23a on a circumference. Each table lifter 25 extends in a radial direction. When compressed air is supplied to the table lifter 25, the balls 25a (see FIG. 2) rise and roll freely. At this time, the balls 25a lift the float table 27. The table lifter 25 may have a clamping mechanism inside.

[0025] A plurality of clamping devices 28 (three in FIG. 2) are arranged on the rotary table 23. Each clamping device 28 has a clamping cylinder 28b (see FIG. 3). The clamping cylinder 28b is a single-acting air cylinder. Each clamping device 28 has a clamper 28a. The plurality of clamping devices 28 are arranged at equal intervals on the circumference. The clamping devices 28 are arranged on the underside of the installation base 23d. When compressed air is supplied to the clamping device 28, the clamper 28a extends downward and abuts against and urges the clamp plate 27c. At this time, the float table plate 27a is pressed against the installation base 23d and clamped. If the workpiece 3 has a sufficient mass, the clamping device 28 may be omitted.

[0026] The float table 27 has a float table plate 27a, side brackets 27b, a clamp plate 27c, a mounting base 27d, and a lower cover 27e. The float table plate 27a is a circular plate. The float table plate 27a is placed on the upper surface of the installation base 23d. The side brackets 27b are placed on the periphery of the float table plate 27a and extend downward. The side brackets 27b may cover the entire side of the float table 27. The clamp plate 27c is a ring-shaped flat plate and is supported by the side brackets 27b. The clamp plate 27c is placed below the float table plate 27a. The lower cover 27e extends further below the side brackets and covers the top of the tilt table 17, the table frame 13, and the jack device 36.

[0027] The alignment device 29 has a plurality (six in FIG. 2) of fixed side posts 29a, a plurality (six in FIG. 2) of float side posts 29b, and a plurality (six in FIG. 2) of tension springs (elastic bodies) 29c. The multiple fixed-side posts 29a are arranged at equal intervals on a circle centered on the rotation axis 1 in the center of the turntable plate 23a. Each fixed-side post 29a is cylindrical and extends upward from the upper surface of the turntable plate 23a. Each fixed-side post 29a has a through-hole 29a1. The float-side posts 29b are arranged at equal intervals on the periphery of the float table plate 27a on a circle concentric with the float table plate 27a. Each float-side post 29b is cylindrical and extends downward from the underside of the float table plate 27a. Each float-side post 29b has a through-hole 29b1. Each tension spring 29c is hung in a through hole 29a1 and a through hole 29b1.

[0028] The jack device 36 includes a jack guide 37, a first slider 39, a second slider 43, a jack screw 45, a right nut 38, a left nut 47, a first arm 42, a second arm 44, a bearing 46, a coupling 50, and a jack motor 49. The jack device 36 raises and lowers the action pin 35 to tilt the tilting table 17.

[0029] The jack guide 37 is a linear guide and is disposed on the table frame 13. The jack guide 37 extends in the Y direction. The first slider 39 has a first pin (first fulcrum) 41. The first slider 39 is guided by the jack guide 37 and reciprocates in the Y direction. The first pin 41 extends in the X direction. The second slider 43 has a second pin (second fulcrum) 48. The second slider 43 reciprocates in the Y direction while being guided by the jack guide 37. The second pin 48 extends in the X direction.

[0030] The first arm 42 connects the action pin 35 and the first pin 41. The first arm 42 rotates freely relative to the action pin 35 and the first pin 41. The second arm 44 connects the action pin 35 and the second pin 48. The second arm 44 rotates freely relative to the action pin 35 and the second pin 48.

[0031] The jack screw 45 has a right-hand thread 45a and a left-hand thread 45b. The right-hand thread 45a and the left-hand thread 45b have the same pitch and are connected coaxially. The jack screw 45 is supported on the bearing base 13c by a bearing 46. The jack screw 45 passes through the first slider 39 and the second slider 43. The right nut 38 is combined with the right-hand thread 45a and fastened to the first slider 39. The left nut 47 is combined with the left-hand thread 45b and fastened to the second slider 43. The jack motor 49 is disposed on the motor bracket 13b. The output shaft of the jack motor 49 is fastened to the jack screw 45 by a coupling 50.

[0032] When the jack motor 49 rotates the jack screw 45, the first slider 39 and the second slider 43 move toward or away from each other. The first arm 42 rotates around the action pin 35 and the first pin 41. The second arm 44 rotates around the action pin 35 and the second pin 48. This causes the action pin 35 to move up and down.

[0033] The length measuring device 51 is, for example, a laser length measuring device. The pair of length measuring devices 51 are arranged side by side in the Z direction. The distance between the pair of length measuring devices 51 in the Z direction is defined as L3. The pair of length measuring devices 51 are arranged on a plane 4 (see FIG. 2) at equal distances from the rotation axis 1. Here, if the axis connecting the rotation axis 1 and the length measuring devices 51 is defined as Y1, the plane 4 is a ZY1 plane passing through the rotation axis 1. The length measuring device 51 measures the distance between the length measuring device 51 and the rotation plane 3a on the plane 4. That is, the length measuring device 51 measures the position of the generatrix of the rotation plane 3a at two points in the height direction.

[0034] As shown in FIGS. 1 and 3, the swivel joint 53 includes a swivel shaft 53a, a swivel housing 53b, a first swivel passage 53c, and a second swivel passage 53d. The swivel shaft 53a is disposed on the tilting base 17. The swivel shaft 53a is disposed about the rotation axis 1. The swivel shaft 53a includes a first fixed port 53a1 and a second fixed port 53a2. The swivel housing 53b is rotatably supported on the swivel shaft 53a. The swivel housing 53b includes a first rotating port 53b1 and a second rotating port 53b2. The first swivel passage 53c connects the first fixed port 53a1 to the first rotating port 53b1. The second swivel passage 53d connects the second fixed port 53a2 to the second rotating port 53b2.

[0035] The air source 71 is, for example, a compressor. The air source 71 may be arranged outside the centering device 10. The air source 71 supplies compressed air to the centering device 10.

[0036] The centering device 10 has a first flow path 72, a second flow path 73, a first valve 74, a third flow path 77, a fourth flow path 78, and a second valve 79. The first flow path 72 connects the air source 71 and the first fixed port 53a1. The second flow path 73 connects the first rotation port 53b1 and the table lifter 25. The first valve 74 is disposed in the first flow path 72. The first valve 74 is, for example, a two-port valve. The third flow path 77 connects the air source 71 and the second fixed port 53a2. The fourth flow path 78 connects the second rotation port 53b2 and the clamp cylinder 28b. The second valve 79 is disposed in the third flow path 77.

[0037] 4 , the centering device 55 includes an arm feed screw 61, a right nut 65, a left nut 66, a linear guide 59, and a pair of arms 63. The centering device 55 may include a frame 57, an arm drive motor 69, a coupling 70, and a bearing 62. Here, the IV-IV plane passes through the centers of the linear guide 59 and the arm feed screw 61 .

[0038] The frame 57 has a frame base 57a, a pair of common brackets 57b, and a motor bracket 57c. The common brackets 57b are disposed at both ends of the frame base 57a in the X direction. The motor bracket 57c is disposed at the -X end of the frame base 57a.

[0039] The linear guide 59 has a spline shaft 59a and a spline guide 59b. The spline shaft 59a is arranged on the frame 57 parallel to the X-axis. Both ends of the spline shaft 59a are supported by common brackets 57b. The spline guide 59b is assembled to the spline shaft 59a and reciprocates in the X-direction. The spline guide 59b is fastened to an arm 63. Preferably, the centering device 55 has a pair of linear guides 59. Each arm 63 is guided by the linear guide 59 and reciprocates in the X-direction. The linear guide 59 may be a ball spline or a linear guide.

[0040] The arm 63 has rollers 64 (contact portions). The arm 63 extends in the Y direction. The pair of arms 63 are arranged symmetrically with respect to a first plane 5. Here, the first plane 5 is a YZ plane passing through the rotation axis 1. Each arm 63 has a pair of rollers 64. The rollers 64 rotate around the Z direction. The rollers 64 are, for example, casters. The pair of rollers 64 are arranged symmetrically with respect to a second plane 6. Here, the second plane 6 is a ZX plane passing through the rotation axis 1. In other words, the two pairs of rollers 64 are positioned symmetrically with respect to the first plane 5 and the second plane 6.

[0041] The arm feed screw 61 has a right-hand thread 61a and a left-hand thread 61b. The right-hand thread 61a and the left-hand thread 61b have the same pitch and are arranged coaxially. Both ends of the arm feed screw 61 are supported by a common bracket 57b via bearings 62. The arm feed screw 61 passes through a pair of arms 63. A right nut 65 is combined with the right-hand thread 61a and fastened to one of the arms 63 (the lower one in FIG. 4). A left nut 66 is combined with the left-hand thread 61b and fastened to the other arm 63 (the upper one in FIG. 4). An arm drive motor 69 is arranged in the motor bracket 57c. The output shaft of the arm drive motor 69 is connected to the arm feed screw 61 by a coupling 70.

[0042] A method of using the centering device 10 of this embodiment will be described with reference to FIG. 5. First, an operator or a robot places the workpiece 3 on the float table 27 (step S1). The table lifter 25 lifts the float table 27 (step S2). The centering device 55 moves the arms 63 toward each other to align the center 3c of the workpiece 3 with the rotation axis 1 (step S3). The table lifter 25 lowers the float table 27 (step S4). The clamping device 28 clamps the float table 27 (step S5). The centering device 55 moves the arms 63 away from the workpiece 3 (step S6). The table rotation motor 19 rotates the rotary table 23 (step S7). The length measuring device 51 determines the tilt phase 2a of the central axis 3b (step S8). The length measuring device 51 determines the tilt angle θ (step S9). The table rotation motor 19 rotates the rotary table 23 to align the tilt direction 2 with the Y direction (step S10). The jack device 36 raises and lowers the tilt table 17 to make the central axis 3b parallel to the Z axis (step S11). Note that step S5 may be omitted.

[0043] Next, each step will be described in detail. In step S1, when the workpiece 3 is placed on the table 27d, the central axis 3b is tilted from the Z direction (see FIG. 6A). The central axis 3b is also eccentric from the rotation axis 1. For convenience, the central axis 3b is drawn to coincide with the rotation axis 1 in FIGS. 6A and 6B.

[0044] In step S2, first, the table lifter 25 is unclamped. Next, the first valve 74 is opened. The air source 71 supplies compressed air to the table lifter 25 via the first valve 74, the first flow path 72, the swivel joint 53, and the second flow path 73. The table lifter 25 raises the ball 25a, causing the float table 27 to float.

[0045] In step S3, the arm drive motor 69 rotates forward. Then, the pair of arms 63 approach the workpiece 3 symmetrically with respect to the first plane 5. When the four rollers 64 contact the rotation surface 3a and the arms 63 narrow, the center 3c (see FIG. 4) of the rotation surface 3a in the XY plane passing through the arms 63 gradually approaches the rotation axis 1. Preferably, the arms 63 are rapidly fed until the rollers 64 approach the rotation surface 3a. Preferably, when the rollers 64 approach the rotation surface 3a and are about to contact the rotation surface 3a, or when the rollers 64 are in contact with the rotation surface 3a, the arms 63 move at a constant speed. Preferably, the arm drive motor 69 stops when it reaches its end torque. At this time, the arms 63 stop. Although the float table 27 is eccentric from the rotation axis 1, the center 3c of the workpiece 3 is substantially aligned with the rotation axis 1.

[0046] In step S4, the first valve 74 is closed. This stops the supply of compressed air to the table lifter 25, and the float table 27 descends. The float table 27 abuts against the installation base 23d, and the movement of the float table 27 in the X and Y directions is suppressed by gravity acting on the workpiece 3.

[0047] In step S5, the second valve 79 is opened. The air source 71 supplies compressed air to the clamp device 28 via the second valve 79, the third flow path 77, the swivel joint 53, and the fourth flow path 78. The clamp device 28 clamps the float table 27.

[0048] In step S6, the arm drive motor 69 rotates in the reverse direction, whereby the arm 63 opens and moves away from the workpiece 3. In step S7, the rotary table 23, the float table 27 and the workpiece 3 rotate together.

[0049] In step S8, the length measuring machines 51 measure the distances L1 and L2 (see FIG. 6A) between the rotation plane 3a and the pair of length measuring machines 51. As the workpiece 3 rotates, the distance difference ΔL = (L2 - L1) changes. The angle from the origin of direction 2 at which the distance difference ΔL is maximum is determined as the tilt phase 2a.

[0050] FIG. 6A shows a view as viewed from an arrow VI (see FIG. 2) in a state where the central axis 3b is inclined toward the length measuring device 51 on the plane 4. FIG. 6B shows a view as viewed from an arrow VI in a state where the central axis 3b is inclined toward the opposite side of the length measuring device 51 on the plane 4. Referring to FIGS. 6A and 6B, in step S9, the length measuring device 51 measures the distance difference ΔL1 = L21 - L11 in the state of FIG. 6A. The distance difference ΔL1 is the maximum value of ΔL. The length measuring device 51 also measures the distance difference ΔL2 = L22 - L12 in the state of FIG. 6B. The distance difference ΔL2 is the minimum value of ΔL. In the example shown in FIG. 6B, the distance difference ΔL2 is a negative value. When the plane of rotation 3a is part of a cylinder, a right circular cylinder, or a right circular cone, the length measuring device 51 determines the tilt angle θ of the central axis 3b according to the following equation: θ=(tan -1 (ΔL1 / L3)+tan -1 (ΔL2 / L3)) / 2

[0051] In step S10, the table rotation motor 19 rotates the rotary table 23 so that the tilt direction 2 coincides with the +Y direction. In step S11, the jack device 36 rotates the jack motor 49 to raise and lower the action pin 35, thereby tilting the tilt table 17 by the tilt angle θ, so that the central shaft 3b becomes substantially upright.

[0052] The centering device 55 of this embodiment positions the center 3c of the workpiece 3 at the center in the X direction. The tilting table 17 oscillates around the X direction. Therefore, as the tilting table 17 oscillates, the center 3c of the workpiece 3 displaces back and forth along the Y direction. The center 3c does not displace in the X direction. Therefore, after the centering device 10 has centered the workpiece 3, the center 3c is located on the ZY plane that passes through the rotation axis 1. The table frame 13 can move in the Y direction along the frame guide 11. Because the tilting table 17 swings around the X direction and the table frame 13 can move in the Y direction, when the tilting table 17 tilts and the central axis 3b becomes upright, the central axis 3b can be positioned at a specific XY position. In other words, when the centering device 10 of this embodiment is applied to the rim cutting device of Patent Document 1, the central axis 3b of the workpiece 3 can be easily aligned with the central axis of the chuck device.

[0053] 7, a centering device 155 according to a modified example of this embodiment has a pair of arms 163. Each arm 163 has a contact V-plane (contact surface) 164. The contact V-plane 164 is composed of two planes that are arranged symmetrically with respect to the second plane 6 and move away from the first plane 5 as they approach the second plane 6.

[0054] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist of the present invention, and all technical matters included in the technical ideas described in the claims are subject to the present invention. The above-described embodiments are preferred examples, but a person skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents disclosed in this specification, and these are included in the technical scope described in the appended claims. [Explanation of symbols]

[0055] 3 Work 10 Centering device 13 Table Frame 15 Support shaft 17 Slope 23 Rotating Table 25 Table Lifter 27 Float Table 36 Jacking device 55, 155 Centering device

Claims

1. A workpiece centering device having a rotation surface and a central axis, Table frame and a support shaft disposed on the table frame; a tilting base rotatably supported on the support shaft; a rotary table supported on the tilting base so as to be rotatable about a rotation axis extending in a vertical direction; a table lifter disposed on the rotary table; a float table that is placed above the table lifter and on which the workpiece can be placed, the float table being movable freely in the left-right and front-rear directions when the float table is raised by the table lifter, and having its movement restricted when the float table is lowered; a centering device having an abutment portion, the abutment portion abutting on the rotation surface when the float table is raised, thereby aligning the center of the workpiece so that it passes through the rotation axis; a jack device that is disposed on the table frame and raises a point of application of the tilting table by lifting a point of application spaced from the support shaft relative to the table frame, thereby uprighting the central axis of the workpiece that has been centered by the centering device so that the center of the workpiece passes through the rotation axis; A centering device having:

2. The centering device is a pair of arms disposed symmetrically with respect to a first plane that is perpendicular to the support shaft and passes through the rotation shaft; each arm has a pair of abutment portions disposed on the inner side of the arm symmetrically with respect to a second plane that passes through the rotation axis and is parallel to the support axis; the pair of arms reciprocate along the support shaft so as to maintain symmetrical positions with respect to the first plane; The centering device according to claim 1 .

3. The contact portion is a roller that rotates around a vertical axis.

3. The centering device according to claim 1 or 2.

4. The pair of arms includes a first arm and a second arm, The centering device is The frame and a linear guide extending parallel to the second plane and disposed on the frame to guide the pair of arms; an arm feed screw having a right-hand thread and a left-hand thread and rotatably supported by the frame; a right nut disposed on the first arm and coupled to the right-handed screw; a left nut disposed on the second arm and coupled to the left screw; having 3. The centering device according to claim 2.

5. a clamping device disposed on the rotary table, the clamping device having a clamper that extends downward; the rotary table has a mounting base disposed above the rotary table, the float table has a clamp plate disposed below the clamper, and when the clamper extends downward, the clamp plate is urged downward by the clamper, causing the float table to come into contact with the installation base; 3. The centering device according to claim 1 or 2.

6. The apparatus further includes a set of centering devices for aligning the center of the float table with the center of the rotary table.

3. The centering device according to claim 1 or 2.

7. The aligning devices each include: fixed posts arranged at equal intervals around the circumference of the rotary table near the center of the rotary table; float-side posts arranged at equal intervals on a circumference of the float table; an elastic body disposed between the fixed post and the float post; having 7. The centering device according to claim 6.

8. the table lifter is an air-driven lifter; The centering device is A swivel joint, a swivel shaft having a fixed port connected to an air source and disposed on the tilting base at the center of the rotary table; a swivel housing having a rotation port and rotatably supported on the swivel shaft; a swivel channel connecting the fixed port and the rotating port; a swivel joint having a first flow path connecting the air source and the fixed port; a second flow path connecting the table lifter and the rotation port; Further comprising:

3. The centering device according to claim 1 or 2.

9. The jack device is a jack guide disposed on the table frame; a first slider having a first fulcrum and reciprocating along the jack guide; a first arm connecting the point of application and the first fulcrum; a second slider having a second fulcrum and reciprocating along the jack guide; a second arm connecting the point of application and the second fulcrum; a jack screw having right-hand and left-hand threads, extending along the jack guide and penetrating the first slider and the second slider; a right nut disposed on the first slider and mated with the right-hand thread; a left nut disposed on the second slider and mated with the left screw; a jack motor connected to the jack screw; having 3. The centering device according to claim 1 or 2.

10. A workpiece having a rotation surface and a central axis is placed on a float table; a table lifter for lifting the float table from the rotary table; The center of the workpiece is aligned with the rotation axis of the rotary table, the table lifter lowers the float table onto the rotary table; The rotary table rotates, a length measuring device measures the position of the generatrix of the rotating rotation surface at two points in the height direction, and determines the tilt phase and tilt angle of the rotation axis; The tilt direction of the rotation surface is aligned with the support axis, which is the rotation center of the tilt table, in a direction that is vertical and horizontal, A jack device raises the point of application of the tilt table to make the central axis of the rotation surface upright. How to center the workpiece.

Images