JP4963937B2 - Rotary table device for machine tools - Google Patents

Description

  The present invention relates to a rotary table device of a machine tool provided with a pallet changer, and in particular, sucks a rotary joint of a fluid supply line for supplying pressure fluid to an actuator for attaching and detaching a pallet and a work attached to the pallet. The present invention relates to a rotary table device of a machine tool having a rotary joint of an air suction pipe for the purpose.

  A rotary table device of a machine tool provided with a pallet exchanging device is provided with a hydraulic device for clamping and unclamping a pallet on the rotary table. A rotary joint is used to supply pressure fluid from a non-rotating part to a hydraulic device provided in a rotary table of the rotating part. A pallet attaching / detaching device is known in which a pull stud provided on a pallet is clamped by a biasing force of a disc spring and unclamped by a hydraulic device of a cylinder or piston mechanism. The rotary joint is a device that connects a fluid conduit between a rotating portion and a non-rotating portion. In the rotary table device, a fluid conduit is connected between a housing and a rotating shaft. In the present invention, in addition to the above-described rotary joint that connects the fluid supply pipes, a rotary joint that connects an air suction pipe for sucking a workpiece attached to the pallet is added. Patent Document 1 discloses a suction chuck type substrate rotation processing device, which is a device for performing processing on a substrate by sucking a substrate placed on a spin chuck attached to a rotation shaft with a vacuum pump. Patent Document 2 discloses a rotary joint used in a through spindle coolant device of a spindle device of a machine tool. A pair of seal members are provided in a non-rotating portion facing an end portion of a rotating shaft, and a pipe line is formed by contacting them. It is a device to connect.

JP-A-7-263324 Japanese Patent No. 2906008

  The applicant of the present application manufactured a rotary joint having a fluid supply line for supplying pressure fluid to an actuator for mounting the pallet on the rotary table and an air suction line for sucking a work attached to the pallet. . In the rotary joint, a connection pipe line (a connection pipe line 53 described later) of the fluid supply pipe line and a connection pipe line (a connection pipe line 77 described later) of the air suction pipe are provided adjacent to each other. The space was partitioned by a seal member (for example, O ring). For this reason, when the workpiece is removed from the pallet, chips and coolant liquid enter the air suction pipe, damage the seal member, and there is a problem that the life of the seal member is short. An object of the present invention is to solve the problems of the prior art, and an object of the present invention is to provide a rotary joint of a fluid supply line for supplying pressure fluid to an actuator for attaching and detaching a pallet, and a work attached to the pallet. In addition to providing a rotary joint device for a machine tool that can be separately provided with a rotary joint of an air suction pipe line for sucking the workpiece and sucking the workpiece attached to the pallet, when the workpiece is removed from the pallet, It is an object of the present invention to provide a rotary table device for a machine tool that prevents a coolant liquid from entering a rotary joint of a fluid supply line even if the coolant liquid enters the air suction line.

In order to achieve the above object, according to the present invention, in a rotary table device of a machine tool provided with a pallet changer, a housing, a rotary shaft rotatably supported by the housing, and the rotary shaft are integrated. A rotary table having an actuator for attaching and detaching a pallet, a pallet having a work mounting surface and attachable to the rotary table, and a position radially away from the center position of the rotary shaft A fluid supply conduit that has a rotary joint that connects the conduit with a seal member interposed between the rotating shaft and the non-rotating portion, and supplies pressure fluid to the actuator of the rotary table; is connected to the fluid supply conduit, and the pressure fluid generating means for discharging a pressure fluid, it is provided separately from said fluid supply conduit, is bored at the center position of the rotary shaft Wherein the rotation shaft ends and a pair of ring-shaped seal member to a non-rotating portion opposite to that of the provided having a rotary joint for connecting a pipe to the sealing member abuts, sucking the work mounted on the pallet And a vacuum pump means connected to the air suction pipe for sucking the air in the pipe, and a rotary table device for a machine tool capable of sucking a workpiece attached to the pallet. Provided.

  Further, in the rotary table device of the machine tool, the fluid supply conduit is drilled at a position radially away from a center position of the rotary shaft, and is provided in communication with an actuator of the rotary table. A rotary joint that connects a pipe line with a seal member interposed between the shaft and the non-rotating part, the air suction pipe being drilled at a center position of the rotary shaft, Provided with an opening on the mounting surface, provided with a pair of ring-shaped seal members at the end of the rotating shaft and the non-rotating portion facing it, and having a rotary joint that contacts the seal member to connect the pipe A rotary table device for a machine tool is provided.

  In order to suck the work attached to the pallet, an air suction pipe is opened on the work attachment surface of the pallet. For this reason, when a workpiece is removed from the pallet, it cannot be prevented that chips and coolant liquid enter the air suction pipe. If chips or coolant enters, the seal member of the rotary joint will be damaged. Therefore, separate the rotary joint of the fluid supply line and the rotary joint of the air suction line so that even if chips or coolant enters the air suction line, it does not enter the seal part of the fluid supply line. did. Further, the seal member of the rotary joint of the air suction pipe line connects the pipe line by sliding contact. The seal member is a highly wear-resistant member so that the seal member is not damaged even if chips or coolant enters the seal portion.

  According to the present invention, in addition to the rotary joint of the fluid supply pipe that supplies the pressure fluid to the actuator for attaching and detaching the pallet, the rotary joint of the air suction pipe for sucking the work attached to the pallet is provided, Since the workpiece mounted on the pallet can be sucked and processed, vibration chatter does not occur during processing and the processing accuracy is improved. In addition, since the rotary joint is separated as described above, even if chips or coolant liquid enters from the air suction pipe, the chips or coolant liquid does not enter the seal portion of the fluid supply pipe, The seal member of the fluid supply conduit is not damaged. Since the seal member of the rotary joint of the air suction pipe is a highly wear-resistant member, the seal member is not damaged even if chips or coolant liquid enters.

  A preferred embodiment of a rotary table device for a machine tool according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of a rotary table device of a machine tool. The table 1 of the machine tool is provided so as to be relatively movable in the three axial directions of X, Y, and Z with a tool spindle (not shown). The table 1 may be a B-axis rotation index table. The housing 3 of the rotary table device is mounted on the table 1 of the machine tool. The rotating shaft 5 is rotatably supported on the housing 3 by bearings 7 and 9. The rotary shaft 5 is rotationally indexed and driven by a drive motor and a drive mechanism (not shown). The drive mechanism is a known mechanism such as a gear device. The rotary table 11 is integrally attached to the rotary shaft 5 by a fastening member (not shown). The upper surface 13 of the rotary table 11 is provided with a clamp / unclamp means 17 for mounting the pallet 15. The clamping / unclamping means 17 is a well-known device, for example, for clamping a pull stud 19 provided on the pallet 15 with a collet 21. It is well known that the pull stud 19 is clamped by a biasing force of a disc spring, and the unclamp of the pull stud 19 is performed by a hydraulic device, that is, a cylinder or piston mechanism. A workpiece 25 is fixed to a workpiece mounting surface 23 of the pallet 15 by a fixture 27. A concave portion 29 of the work 25 indicates a processed shape.

  A fluid supply conduit 31 is formed at a position radially away from the center position of the rotating shaft 5, and the fluid supply conduit 31 is connected to a pressure fluid generating means (not shown), and pressure is applied to the clamp / unclamp means 17. This is a conduit for supplying fluid. A necessary number of fluid supply pipes 31 are provided according to the number of actuators. An air suction pipe 33 is bored at the center position of the rotary shaft 5, and the air suction pipe 33 is connected to a vacuum pump means (not shown), and a central portion of the work 25 attached to the pallet 15 is sucked by the vacuum pump. This is a conduit for suction. A pipe joint means 35 with the pallet 15 is provided at the center of the rotary table 11, and the piston member 37 is pressed against the pallet 15 by a spring 39 to connect the pipe line. A fluid supply conduit 31 is opened at the center of the work mounting surface 23 of the pallet 15 with an opening 41. An appropriate groove may be provided around the opening 41 in order to improve the close contact of the work 25.

  Next, the rotary joint 45 of the fluid supply pipe 31 and the rotary joint 61 of the air suction pipe 33 will be described with reference to FIG. FIG. 2 is a diagram illustrating in detail the portions of the rotary joint 45 and the rotary joint 61. The housing 47 of the rotary joint 45 is attached to the housing 3 of the rotary table device. The rotating shaft 5 is rotatably supported by bearings 49 and 51 inside the housing 45. As described above, the rotary shaft 5 is provided with the fluid supply line 31 and the air suction line 33. The fluid supply line 31 is connected to a connection line 53 provided in the housing 47, and a pressure member does not leak by interposing a seal member 55 between the rotating part and the non-rotating part. The pressure fluid is supplied to the connection line 53 from a pressure fluid source (not shown). The pressure fluid generating means is a well-known fluid pump.

  The housing 63 of the rotary joint 61 is attached to the housing 47 of the rotary joint 45. An air suction pipe 33 is provided at the center of the rotary shaft 5, and a block 65 for attaching a seal member is attached to the end of the rotary shaft 5. A seal member 67 is fixed to the end of the block 65. A seal member 69 is provided in a non-rotating portion at a position facing the seal member 67. The seal member 69 is fixed to the tip of the piston 71. The piston 71 is movable left and right within the cylinder 73. The piston 71 is urged to the right side by a spring 75, the seal member 69 is brought into contact with the seal member 67, and the rotating part and the non-rotating part of the air suction pipe 33 are connected. Since the seal member 67 rotates and the seal member 69 does not rotate, a sliding contact occurs between them. The seal members 67 and 69 are made of ceramics having high wear resistance. The air suction pipe 33 passes through the block 65, the seal members 67 and 69, and the piston 71 and is connected to the connection pipe 77. The connection pipe line 77 is connected to vacuum pump means (not shown), and when the air in the pipe line is sucked by the vacuum pump, the bottom surface of the work 25 attached to the pallet 15 is in close contact with the pallet 15. As shown in FIG. 1, when a thin workpiece is machined, chatter occurs due to vibration and machining cannot be performed with high accuracy. When the central portion of the workpiece 25 is sucked with a negative pressure, it is possible to cleanly process without generating chatter.

It is sectional drawing which shows embodiment of the rotary table apparatus of the machine tool of this invention. It is sectional drawing of detailed description of the rotary joint part of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Housing 5 Rotating shaft 11 Rotary table 15 Palette 25 Work 31 Fluid supply conduit 33 Air suction conduit 45 Fluid supply conduit rotary joint 55 Seal member 61 Air suction conduit rotary joint 67, 69 Seal member

Claims (1)

In a rotary table device of a machine tool equipped with a pallet changer,
A housing;
A rotating shaft rotatably supported by the housing;
A rotary table which is provided so as to be rotatable integrally with the rotary shaft and has an actuator for attaching and detaching a pallet;
A pallet having a work mounting surface and attachable to the rotary table;
A rotary joint that is drilled at a position radially away from the center position of the rotating shaft and connects a pipe line with a seal member interposed between the rotating shaft and a non-rotating portion ; A fluid supply line for supplying pressure fluid to the actuator;
A pressure fluid generating means connected to the fluid supply line for discharging the pressure fluid;
Provided separately from the fluid supply line, provided at a center position of the rotary shaft , and provided with a pair of ring-shaped seal members at an end portion of the rotary shaft and a non-rotating portion opposed thereto; An air suction pipe for sucking a workpiece attached to the pallet, having a rotary joint that contacts and connects the pipe;
A vacuum pump means connected to the air suction line and sucking air in the line;
A rotary table device for a machine tool, characterized in that the workpiece mounted on the pallet can be sucked.

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