A changing device for rotary indexing tables has a stand component (12) used as a base component. Through the stand component (12) a shaft (18) passes defining the axis of rotation of tables (2) rotatable by an electric motor which having an interface (20) for coupling concerned tables (2). Tables 2 can be fixed in predeterminable rotational positions relative to a table unit (8) by a clamping device (60). At least two table units (8), differing from each other at least with respect to their clamping devices (60), together with their assigned table (2) as exchange components can be fixed in an interchangeable manner on the base component for their operation.

A machine tool including a rotary table to which a workpiece to be subjected to machining is attached, a motor that rotates the rotary table, a brake that places the rotary table in a clamping state or an unclamping state, a valve that controls fluid supplied from a fluid supply source to the brake for placing the brake in the clamping state or the unclamping state, and a controller that controls the motor and the valve, where the controller determines whether or not rotation of the rotary table by the motor should be executed on the basis of a signal from a pressure switch of a regulator provided between the fluid supply source and the valve.

The present disclosure relates to a machine tool, in particular multi-spindle turning machine, comprising a machine frame, a turret body being rotatably supported by the machine frame, a plurality of workpiece spindles being arranged on the turret body, each of the workpiece spindles having a workpiece receiving portion for receiving a respective workpiece on one side of the turret body facing a working space of the machine tool, and a torque motor for driving a rotation of the turret body. The torque motor is arranged at a back end portion of the turret body opposite to the side of the turret body facing the working space of the machine tool, and a position locking mechanism for locking a rotational position of the turret body is arranged at a front end portion of the turret body on the side of the turret body facing the working space of the machine tool.

The rotary table system includes a first rotary table coupled to one end side of a member for loading a workpiece, a second rotary table coupled to an other end side, a motor that rotationally drives the member for loading a workpiece, a first clamping mechanism that can clamp the first rotary table, a second clamping mechanism that can clamp the second rotary table, a clamp torque measuring device, a first operating passage that sends a clamping operation instruction to the first clamping mechanism, and a second operating passage that sends a clamping operation instruction to the second clamping mechanism, in which the clamp torque measuring device measures clamp torque individually for each of the first, second clamping mechanisms by individually selecting the first, second operating passage and causing the first, second clamping mechanisms to individually perform a clamping operation.

A rotary table device according to the present invention includes: a spindle that supports a table; a driving mechanism that drives the spindle; a load detection portion that detects a load of the driving mechanism; a clamp mechanism that inhibits rotation of the spindle; a rotation control portion that causes the driving mechanism to drive the spindle with a predetermined inspection pattern after the clamp mechanism starts releasing clamping; and a determination portion that determines whether good or not with respect to an operation of the clamp mechanism based on of change over time in the load detected by the load detection portion when the spindle is driven with the inspection pattern.

A tool turret has a housing (1), a turret head (2) rotatable relative to the housing (1) by a drive. Two toothed rims (4, 9) are arranged coaxial to the rotational axis of the turret head (2). One rim (4) is connected fixedly to the turret head (2). The other rim (9) is connected fixedly to the housing (1). A locking part (24) can be moved axially relative to the housing (1) and to the turret head (2), with the toothing system (24) oriented towards the two toothed rims (4, 9). In the locked position, the locking part is in engagement with the rims as a positively locking connection. A pressure fluid control actuates the movement of the locking part (24). An additional frictionally locking connection (73) is established between the housing (1) and the turret head (2) by a frictionally locking device (67).

A rotary table device includes: a case; a spindle having an axis hole that is provided rotatably in the case and extends through along an axis direction of a center portion; a rotary joint having a rotary shaft attached non-rotatably to the axis hole of the spindle; and a clamp mechanism arranged in a rear end side of the case and having a component attached non-rotatably to the spindle, the rotary shaft having an attachment flange unit with the spindle in a front end portion, the rotary shaft inserted to the axis hole from the front end side of the spindle to be attached to the spindle by the attachment flange unit, a rear end portion of the rotary shaft projecting from a rear end surface of the spindle, the component of the clamp mechanism mounted to a rear end portion of the rotary shaft projecting from the rear end surface of the spindle from a rear end side, and contacting with and externally fit to an outer circumferential surface of the rear end portion.

The objective of the present disclosure is to provide a means capable of performing clamping and unclamping operations at appropriate times. In a machining system 1 provided with a rotary table device 10, a numerical controller 30 according to an embodiment of the present disclosure controls the rotary table device 10 in accordance with a machining program including a plurality of statements, said rotary table device 10 including a table 11, drive mechanisms 12, 13 that rotate and position the table 11 around an axis, and clamping mechanisms 14, 15 that restrain the rotation of the table 11. The numerical controller 30 is provided with: an unclamping addition unit 35 which adds an unclamping operation for releasing the restraint of the table 11 immediately before execution of a table rotation statement that is included in the machining program and that specifies the operation of the drive mechanisms 12, 13; and a clamping addition unit 36 which adds a clamping operation for restraining the table 11 immediately after the execution of the table rotation statement.

In a method of controlling a rotary table device, a clamp mechanism drive unit is controlled to unclamp a brake disk. Thereafter, a pressure of working fluid supplied to an unclamp fluid chamber is decreased, and a motor drive unit is controlled to rotate a motor. Then, the abrasion quantity of the piston and the clamp member is calculated based on a reference pressure and a pressure when the load torque of a spindle exceeded a reference load torque.

A rotating table is maintained in a stationary state by generating a clamping torque while ensuring a long enough lifetime of a plate spring. Provided is a rotating table device including: base members; a rotating member that is supported by the base members so as to be rotatable about an axis; a brake disk that is secured to the rotating member; and a clamping mechanism that clamps the brake disk, wherein the clamping mechanism is provided with a piston that is attached so as to be movable between a clamped position and an unclamped position in a direction along the axis with respect to the base members, a plate spring that is secured to the piston and the base members and that biases the piston toward the clamped position, and a coil spring that is disposed between the piston and the base members, and that constantly biases the piston toward the clamped position.