JP2019520223A - Workpiece rotation table - Google Patents

Abstract

A work processing rotary table capable of performing a function of a rotary table which can rotate while supporting a work and a function of an index table which can fix rotation at a predetermined angle.
SOLUTION: A main body portion, a rotary shaft rotatably provided on the main body portion by a first bearing portion, a table provided on the rotary shaft and provided with a work, and provided on the table rotate with the table A first member, a drive portion for driving a rotating shaft provided at the center of the main body portion, a second member provided on a corresponding main body portion of the first member, the first member and the second member And a preload application unit for applying a preload to the first bearing that holds the rotation shaft with respect to the main body.
[Selected figure] Figure 1

Description

  The present invention relates to a work processing rotary table, and more particularly, to a work processing rotary table capable of performing a function of a rotary table that can rotate while holding a work and a function of an index table that can fix rotation at a predetermined angle.

  In general, machines that use various cutting methods or non-cutting methods to process shapes of metal or nonmetal materials using appropriate tools, or to perform more precise processing on semi-materials are called machine tools . Among such machine tools, a machine tool in which a chip is generated in the process of machining is called a cutting machine tool, and a non-cutting machine tool in which no chip is generated in the process of machining is called a plastic working machine. Such cutting machine tools include lathes, milling machines, machining centers, drilling machines, boring machines, grinding machines, Kier machines, special processing machines, etc. As metal forming machines, mechanical presses, hydraulic presses, cutting and bending machines , Forging machines, drawing machines and the like.

  Although a machine tool is provided with a table for placing a work, this table is generally designed to be rotationally driven using a rack gear and a pinion gear or a worm gear and a worm screw.

  In machine tools, a table rotating device using a worm gear and a worm screw is common.

  The conventional machine tool table rotating apparatus as described above needs to divide the rotation of the worm gear and the motor for driving the worm screw into divided intervals for table rotation or indexing, and so like a carvic coupling In addition to the need for a separate dividing device, the structure is complicated due to the need for a rotary encoder or the like for angle measurement, and the manufacturing cost is increased.

  In view of the above problems, Korean Patent No. 1604547 discloses a rotary table apparatus for a machine tool. Korean Patent Publication No. 2001-0028580 discloses a table indexing apparatus for a machine tool.

  Since the conventional table indexing apparatus described above has a structure in which continuous rotation and division are performed independently, another table should be used for rotation and indexing, so it is necessary to set time for processing of a workpiece. And it has the disadvantage of poor workability.

  Japanese Patent Application Laid-Open No. 6-71542 discloses a divided table.

  The divided table is raised and lowered by a cylinder mechanism, and is provided with a table main body having a piston whose rotation around the axis is restricted, and a turning table held on the table main body and divided and rotated around the axis A first coupling gear provided on the table and a second coupling gear fixed to the table main body are provided on the same center line, and a third coupling is engaged with the first and second coupling gears upward by lowering the piston A gear is connected to the piston.

  However, the division table is relatively complicated in structure, and there is no particular problem particularly in vertical installation, but there is a problem that rotational vibration occurs because of fine play between components in horizontal installation. .

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is to rotate the workpiece while it is mounted for processing of the workpiece, or to accurately and relatively at a certain angle. To provide a work processing rotary table that can be strongly fixed.

  Another object of the present invention is to provide a work processing rotary table capable of controlling vibration and rotation by applying a preload to the bearing of the rotary shaft of the table.

  To solve the above problems, according to one aspect of the present invention, a main body, a rotary shaft rotatably mounted on the main body by a first bearing portion, and a work provided on the rotary shaft Table, a first member provided on the table and rotating with the table, a driver provided on the main body and the rotary shaft for driving the rotary shaft, and a corresponding main body of the first member And a second bearing portion provided between the first member and the second member, and a preload application unit for applying a preload to a bearing that holds the rotation shaft with respect to the main body portion. It is characterized by having.

  In the present invention, the preload applying unit is formed on a shaft corresponding to the upper surface side or the lower surface side of the outer ring of the bearing, and a cylinder portion provided with a piston for applying a preload to the outer ring of the first bearing portion; And a working pressure applying unit for applying a preload to the first bearing portion by applying a working pressure for working to the portion and pressing the outer ring of the first bearing portion by the piston.

  The apparatus further includes a table indexing unit provided on a table on the lower side of the first member and the second member for fixing the table at a predetermined angle, the table indexing unit including the first member and the second member. A locking base member provided between the lower table and the main body and provided on the table for rotation with the table, and the table movably between the first locking base member and the first and second members And a locking member forming a first cylinder portion with the first member and forming a second cylinder portion between the locking base members, and the first cylinder portion provided in the main body portion The table is rotated by supplying air pressure or oil pressure to lower the locking member and separating it from the first member and the second member. A first operating pressure supply unit for supplying air pressure and oil pressure to the second cylinder portion to raise the locking member to connect the first and second members and the locking member to fix the rotation of the table And a second operating pressure application unit for

  In the table indexing unit, the upper and lower surfaces of the first and second members and the locking member coupled thereto are respectively formed with an uneven surface.

  According to the present invention as described above, it is possible to achieve excellent compatibility when machining a workpiece on a machine tool since the table can be rotated or fixed at a fixed angle while the workpiece is mounted for machining of the workpiece. Can.

  Further, the present invention can apply a preload to the bearing of the rotary shaft of the table to control vibration and rotation, and can increase the rotational fixing force and precision of the table in the indexing mode.

FIG. 1 is a perspective view showing a work processing rotary table according to a first embodiment of the present invention. It is sectional drawing which shows the drive part of the turntable for workpiece processing shown in FIG. It is a partially cutaway sectional view showing a work processing rotary table according to a first embodiment of the present invention. It is an excerpted sectional view of the precompression application unit shown in FIG. It is sectional drawing which shows the rotary table for workpiece processing concerning the 2nd Embodiment of this invention. FIG. 6 is a partial cutaway cross-sectional view of the work processing rotary table shown in FIG. 5, showing an operating state; FIG. 6 is a partial cutaway cross-sectional view of the work processing rotary table shown in FIG. 5, showing an operating state; It is sectional drawing which shows the rotary table for workpiece processing concerning the 3rd Embodiment of this invention. FIG. 9 is a partial cutaway cross-sectional view of the work processing rotary table shown in FIG. 8, showing an operating state;

  The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

  The work processing rotary table according to the present invention is capable of fixing the position of rotation and rotation while fixing the work on the table, and one embodiment thereof is shown in FIGS.

  Referring to FIGS. 1 to 3, the work processing rotary table 10 according to the present invention is rotatably supported by a main body 11 fixed to a table of a machine tool or the like and a first bearing 20 to the main body 11. A rotary shaft 12 is provided, and a table 13 provided on the rotary shaft 12 and on which a workpiece is placed. A first member 31 fixed to the lower side of the table 13 and rotating with the table 13, and a driving unit 15 provided on the main body 11 and the rotating shaft 12 for driving the rotating shaft 12 are provided. A second member 32 is provided on the corresponding main body 11 of the first member 31, and a second bearing 40 is provided between the first member 31 and the second member 32. The body portion 11 is provided with a preload application unit 50 for applying a preload to the first bearing portion 20 holding the rotating shaft 12.

  The upper surface of the table 13 provided on the rotary shaft 12 is provided with a through hole 13a in which a number of taps for fixing a work are formed. The first bearing portion 20 for holding the rotary shaft 12 with respect to the main body portion 11 is a roller bearing made of a roller, and the second bearing portion 40 is selected from a ball bearing, a roller bearing and a journal bearing. It can consist of any one, but it is not limited to this.

  The drive unit 15 is provided with a worm wheel 15a provided on the rotary shaft 12 and a body portion 11. The drive unit 15 comprises a worm screw 15b meshing with the worm wheel 15a and a motor 15c for rotating the worm screw 15b. sell. The motor may be a stepping motor or a hydraulic motor, but is not limited thereto. Then, the main body 11 corresponding to the outer peripheral surface of the worm wheel 15a is engaged with the drive wheel of the worm wheel or motor 15c for indexing the table 13, and provided on the shaft of the worm screw to engage with the drive gear. A plurality of angle detection sensors 16 are provided to detect the rotation angle of the sensor. The body portion 11 may further include a plurality of pressing members 15d and 16d (see FIGS. 7 and 8) capable of preventing the backlash by elastically biasing the worm screw 15b toward the worm foil 15a.

  As shown in FIGS. 3 and 4, the preload applying unit 50 applies an external force to the outer ring of the first bearing unit 20 holding the rotating shaft 12 to apply a constant preload by the rotation of the rotating shaft 12. The piston 51 is formed on a shaft corresponding to the upper surface side or the lower surface side of the outer ring 21 of the first bearing portion 20 for applying a preload to the outer ring 21 of the first bearing portion 20. A cylinder unit 52 is provided. Here, the inner ring 22 provided on the rotating shaft 12 for holding the roller 23 of the first bearing portion 20 must not contact the piston 51 when the piston 51 moves forward and backward.

  The preload applying unit 50 includes an operating pressure applying unit 55 for moving the piston 51 in the direction of applying a preload to the outer ring 21 in the cylinder unit 52. An elastic spring 56 may be provided between the upper surface of the piston 51 and the inner surface of the cylinder portion 52 to apply a basically constant preload to the first bearing 20. The working pressure application unit 55 includes a pneumatic or hydraulic pressure supply pipe 55a provided on the main body 11 for supplying pneumatic pressure or hydraulic pressure to the cylinder section, and although not shown, the pneumatic or hydraulic pressure supply pipe 55a is connected to a power source for supplying air pressure or oil pressure, and the air pressure or oil pressure supply pipe 55a is provided with a valve.

  In the rotary table device configured as described above, the table 13 is rotated by the worm screw 15b being rotated by the worm screw 15b as the worm wheel 15b is rotated by the motor 15c. Under the present circumstances, since it is hold | maintained by the 2nd bearing part 40 between the 1st member 31 provided in the said table 13 and the 2nd member provided in the main-body part 11, by mounting the work on the table 13 The holding power to the working main body can be increased. Then, in the process of rotation, by applying an appropriate preload by the processing amount by the load to the first bearing unit 20 by the preload application unit 50, the vibration due to the rotation of the table 13 can be minimized, and the work of heavy weight is When mounted on a table, the rotational torque due to the rotation of the table can be reduced, and the rotational accuracy can be stably improved.

  On the other hand, as shown in FIG. 4 to FIG. 6 and FIG. 7, a table indexing unit provided on the table 13 on the lower side of the first member 31 and the second member 32 to fix the table at a predetermined angle. 70 is further provided.

  The table indexing unit 70 is disposed between the table 13 and the main body 11 below the first and second members 31 and 32 and includes a locking base member 71 provided on the table 13 and rotating with the table 13. The table indexing unit 70 is provided with a locking member 72 on the table 13 between the locking base member 71 and the first member 31 and the second member 32 so as to be able to move up and down. However, the present invention is not limited to the embodiment described above, and as shown in FIGS. 8 and 9, the locking base member 71 is fixed to the main body 11 when moving up and down the locking portion 72 and the ring-shaped locking member 72. And elevating guide portions 92 for guiding the The inner side of the elevating guide 92 approaches or slides with the table 13. The locking member 72 that moves up and down along the lifting guide 92 is provided with an elastic member 95 for moving the locking member 72 downward, that is, toward the locking base member 71 side. As described above, when the locking base member 71 is provided, the locking base member 71 is fixed to the table 13 or the rotation shaft to prevent the locking base member from hanging down or deforming downward when the locking member 72 rises. A holding member 96 for holding may be provided. The installation of the locking base member 71 as described above facilitates the installation of a seal for airtightness at the time of installation of the second cylinder portion described later.

  A first cylinder portion 74 for lowering the locking member 72 is provided between the first member 31 and the locking member 72, and the first cylinder portion 74 is disposed between the locking member 72 and the locking base member 71 or 90. A second cylinder portion 73 for raising the locking member 72 is provided.

  The table indexing unit 70 is provided in the main body 11 and supplies pneumatic pressure or hydraulic pressure to the first cylinder portion 74 to lower the locking member 72 and separate it from the first member 31 and the second member 32. Thus, the first operating pressure application unit 76 for rotating the table 13 and the pneumatic or hydraulic pressure supplied to the second cylinder unit 74 to raise the locking member 72 to raise the first member 31 and the second member. A second operating pressure application unit 77 for fixing the rotation of the table 13 by coupling the locking member 32 and the locking member 72 is provided. The first working pressure application unit 76 and the second working pressure application unit 77 have substantially the same structure as that of the working pressure application unit. That is, an oil pressure supply pipe is provided to supply and discharge air pressure or oil pressure to the first cylinder portion and the second cylinder portion.

  Meanwhile, teeth 31a, 32a and 72a are formed on the lower surfaces of the first member 31 and the second member 32 and the upper surface of the locking member 72 coupled thereto to fix the rotation of the table 13 respectively. Ru. The teeth 31a, 32a, 72a are radially formed with respect to the centers of the first and second members and the center of the locking member 72, and are arranged circumferentially. The number of teeth 31a, 32a, 72a may be adjusted in view of indexing conditions.

  The rotary table 10 according to the present invention configured as described above supplies a predetermined pneumatic pressure or hydraulic pressure to the first working pressure application unit 76 in order to use the rotary table with the work fixed to the table 13. Then, the locking member 72 is lowered to separate the first member 31 and the second member 32 from the locking member 72 so that the corresponding teeth 31a, 32a, 72a are separated from each other. .

  In this state, when the motor 15c is driven, the table 13 is rotated by rotating the worm 15b and the worm wheel 15a. Under the present circumstances, since it is hold | maintained by the 2nd bearing part 40 between the 2nd member 32 provided in the 1st member 31 and the main-body part 11 which are provided in the said table 13, a workpiece | work is mounted by the table 13. The holding force acting on the main body portion 11 can be improved.

  Then, in the process of rotation, by applying a preload to the first bearing portion 20 by the preload application unit 50, the vibration due to the rotation of the table 13 can be minimized, and a large-weight work is mounted on the table The rotational torque accompanying the rotation of the table can be reduced.

  Further, when it is desired to use the rotary table apparatus 10 as an indexing table, the second operating pressure application unit of the table indexing unit 70 is detected in a state where the rotation angle set by the rotation angle detection sensor 16 acting on the worm wheel 15a is detected. A relatively high pneumatic or hydraulic pressure is supplied to 77 to raise the locking member 72. In this way, the first member 31 and the second member 32 and the locking member 72 are in close contact with each other, whereby the teeth 31a, 32a, 72a formed on their corresponding sides are mutually connected. At this time, the teeth 31a, 32a, 72a formed on the lower surfaces of the first member 31 and the second member 32 and the upper surface of the locking member 72 and connected to each other increase their coupling force to position the rotary table, that is, indexing. Position can be controlled precisely. In this process, it is natural that the drive unit does not operate. With the rotation of the table 13, the main body 11 is fixed to the second member 32, and the fixing force is fixed by the locking member 72 for rotation. In this process, the rotation of the rotation shaft can be fixed by applying a relatively high preload to the first bearing portion 20 by the preload application unit 50.

  On the other hand, a thrust bearing 80 is provided between the lower portion of the table 13 and the main body 11 to prevent the deformation of the main body 11 when a strong preload is applied and to maintain the accuracy.

  As described above, the work processing rotary table according to the present invention can be fixed at a fixed angle while rotating the table for fixing the work. Therefore, the functions of the conventional rotary table and the index table can be simultaneously satisfied.

  Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that those skilled in the art to which the present invention belongs can conceive of various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that this is also within the technical scope of the present invention.

Claims (6)

A main body portion, a rotary shaft rotatably mounted on the main body portion by a first bearing portion, a table provided on the rotary shaft and provided with a work, and a first member provided on the table and rotated with the table ,
A driving unit provided on the main body and the rotating shaft to drive the rotating shaft;
A second member provided to a corresponding body portion of the first member;
A second bearing portion provided between the first member and the second member;
A work processing rotary table comprising: a preload application unit for applying a preload to a first bearing that holds the rotation shaft with respect to the main body. The preload applying unit is formed on a shaft corresponding to the upper surface side or the lower surface side of the outer ring of the bearing, and a cylinder portion provided with a piston for applying a preload to the outer ring of the bearing;
2. The apparatus according to claim 1, further comprising: a working pressure applying unit that applies a preload to the bearing by applying air pressure or oil pressure to the cylinder unit to pressurize the outer ring of the first bearing unit. Workpiece rotating table.   The work processing according to claim 1 or 2, further comprising a table indexing unit provided on a table on the lower side of the first member and the second member for fixing the table at a predetermined angle. Rotary table. The table indexing unit is disposed between the lower table and the main body of the first and second members, and is provided on the table or the main body to rotate with the table; and the first locking base member Locking provided on a table movably between the first member and the first member and the second member, forming a first cylinder portion between the first members, and forming a second cylinder portion between the locking base members Members,
A first operating pressure supply provided on the main body for supplying pneumatic pressure or hydraulic pressure to the first cylinder to lower the locking member to separate the first member and the second member, thereby rotating the table A second operating pressure for securing rotation of the table by connecting the first and second members and the locking member by supplying the pneumatic pressure and the hydraulic pressure to the second cylinder portion to raise the locking member; The workpiece processing rotary table according to claim 3, further comprising: an applying unit.   5. The work processing rotary table according to claim 4, wherein the first member and the second member, and the upper surface of the locking member coupled thereto are formed with projections and recesses mutually connected. 4. The rotary table for processing a work according to claim 3, wherein the locking base member comprises a fixing portion fixed to the main body portion, and an elevation guide portion for guiding the ring-shaped locking member at the time of raising and lowering.

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