Abstract: A clamp device is provided that can prevent a table from being tilted at the time of clamping, can suppress a displacement in an axial direction at the time of clamping to a minimum, and also can be suitably used for a table unit with its table swiveling at a high speed. A table has fixedly attached thereto a braking plate swiveling with the table. A frame has fixedly attached thereto fixing plates having inner flange portions protruding to a swiveling axis side of the table with a predetermined pitch so that the inner flange portions interpose the braking plate. Moreover, a hydraulic cylinder having a clamp piston freely movable between a clamp position at which the braking plate is clamped and an unclamp position at which the clamp state is released is provided with the flame.

Abstract: A controller includes a rotating direction detecting unit 34 to detect the rotating direction of a servo motor 6, a reversing distance computing unit 31 to compute a rotating angle of the servo motor 6, a rotation resistance computing unit 35 to compute rotation resistance on the servo motor side 6, and an elastic deformation error amount computing unit 21 to compute a deformation error amount of a ball screw 3. In the controller, when the rotating direction detecting unit 34 detects reverse of the servo motor 6, the rotation resistance computing unit 35 computes rotation resistance based on a rotating angle ?? of the servo motor 6 after the servo motor is reversed. The elastic deformation error amount computing unit 21 computes the elastic deformation error amount ? based on the computed rotation resistance. Thereby, a position command value inputted into the position control unit 14 can be corrected.

Abstract: There had been a problem that the installation area of a linear motor becomes large when a plurality of linear motors are arranged in parallel in the travel direction of a mover. In the present linear motor, stators provided between adjacent movers 51a, 51b are integrally formed. The integrally formed stator 52c has salient poles 50 on each of the two surfaces opposing the movers 51a, 51b. As a result, installation area may be reduced compared to a case where a plurality of linear motors are simply arranged in parallel with respect to the travel direction of the mover.

Abstract: An approximate curve generation method according to the present invention generates an approximate curve as smooth as an original curve from point group data obtained by approximating a curve shape, and includes: an approximate polygon shape range determining step of sectioning point group data for each line segment of an approximate polygon shape which is generated when the point group data approximating the curve shape are obtained, and sorting the point group data close to a section boundary as valid point group data, and the point group data inside the valid point group data as invalid point group data; and an approximate curve generating step of regarding only the valid point group data, and generating an approximate curve passing through or close to the regarded valid point group data as an approximate curve to be finally obtained.

Abstract: After a thermal displacement correcting program has started, a temperature is measured with a temperature sensor in S1, then when a rotational speed of a spindle is changed during the measurement (S2), a counter starts (S3). Then in S4, from a preset relationship between the rotational speed of the spindle and a setting-equivalent heat value, a correction factor that is a difference in setting-equivalent heat value between before and after the change in rotational speed of the spindle is calculated. Subsequently, in S5, a temperature-equivalent heat value is calculated, and then in S6, a compensation amount is calculated from the correction factor and a time elapsed after the change in rotational speed of the spindle. In S7, an equivalent heat value for compensating a dead time is obtained based on the sum of them S8, an estimated calculation for thermal displacement conversion is performed, and a correction process by an NC unit is performed in S9.

Abstract: The invention relates to a method for detecting an abnormality of a temperature sensor. A plurality of temperature sensors are preliminarily grouped for each of predetermined attachment areas of a machine tool, and after a temperature of each part is measured in S1, the detected temperatures are classified in S2 for each of the grouped attachment areas, and then sorted in descending order in S3. Subsequently, a difference ?T between any closest two of the detected temperatures is obtained in S4, and then compared with a preset limit value ? in S5, when ?T exceeds the limit value ?, temperature sensors in a corresponding attachment area are determined abnormal in S6, and an alarm is displayed.

Abstract: When performing numerical control of a rotary table, the moment of inertia and the center of gravity of a control target change because of a placed object fixed onto the rotary table. A rotary table to which a placed object has been fixed serves as a target plant, the actual motion of this is compared with motion calculated by an identification model of the target plant, and a torque command value is corrected. The identification model comprises a term pertaining to angular acceleration and a term pertaining to angle of rotation, and by including the term pertaining to angle of rotation, correction of a torque command corresponding to a change in the center of gravity can be performed.

Abstract: In a position control apparatus that drives a feed-axis with a servomotor of a machine tool, the machine tool maybe quickly accelerated or decelerated in a state where a machine structural member that supports and fixes a structural member including a driving system has a lower rigidity, or in a state where an element having a lower rigidity is present beyond a load position where the detection by a linear scale is performed. In such cases, a generated deflection may induce a displacement in a mechanical system. A relative locus error may be generated between a workpiece to be processed and a front end portion of the tool. Further, a mechanism rigidity generally changes according to a machine posture. The generated deflection amount changes in magnitude. The present embodiment estimates and compensates a displacement amount of the front end portion of the tool that may be caused by the deflection of the mechanical system.

Abstract: Two position sensors provide, as outputs, two signals that vary sinusoidally at a pitch of wavelength ? with respect to a displacement of a target and have phases shifted from each other by 90°. A memory unit has stored therein offset values for the two signals, and two subtractors eliminate the offset values from the two signals, respectively. The two signals after offset elimination are converted into position data in an interpolation calculator. A radius calculator calculates a radius value of the two signals after offset elimination. An FFT calculates offset values based on the position data and the radius values, and the calculated offset values are used to update the values stored in the memory unit. An amplitude ratio correction value and a phase difference correction value for the two signals are updated similarly. By performing elimination of the components that degrade interpolation accuracy at every rotational position, interpolation accuracy is improved.

Abstract: In a combination machining lathe, a workpiece holding device holds a workpiece in a manner that permits the workpiece to rotate around an axis parallel to a direction of a horizontal Z axis. A tool post holds a tool that comprises a holder and a bit. The tool held by the tool post is indexed to a position in which the longitudinal axis of the holder is parallel to an X axis direction. The bit of the tool held by the tool post is angled such that a longitudinal axis of the bit is disposed in a position tilted away from the X axis direction closer to a horizontal axis in a plane containing the X axis and the Y axis. A turning operation is performed while the tool and/or the workpiece are moved relative to each other in a direction of the longitudinal axis of the bit.

Abstract: A vibration suppressing method and a vibration suppressing device are disclosed. After a tool is attached to a main spindle, a modal parameter of the tool or a workpiece is computed. Thereafter, a relation between chatter frequency and phase difference is calculated as an approximation formula based on the obtained modal parameter and machining conditions. If chatter vibration occurs after initiation of the machining, a chatter frequency corresponding to a target phase difference is obtained using the approximation formula, and based on the obtained chatter frequency, the number of tool flutes and the main spindle rotation speed, the optimum rotation speed is calculated. The rotation speed of the main spindle is then changed in accordance with the obtained optimum rotation speed.

Abstract: First of all, in a first step S1, each actuator command value for position command value and posture command value of an end-effector is determined. Next, in a second step S2, rotational resistance values of a first and a second universal joints are obtained, and in a third step S3, the force and the moment exerted to each of the second universal joints are computed using this, and in a fourth step S4, the resultant force and the resultant moment exerted to the end-effector are determined from these. Then, in the fifth step, the elastic deformation amount of a mechanism is computed using these, and a compensation amount of the actuator command value is computed using these values. And then, in the sixth step, the actuator command values determined in the first step are updated with the compensation amount determined in the fifth step taken into account.

Abstract: A collision preventing device includes an acceleration/deceleration simulating unit 30 that performs acceleration/deceleration processing based on a moving command generated by a function generation unit 16 according to a method similar to that used by acceleration/deceleration units 18x and 18z and obtains a moving path resulting from the acceleration/deceleration processing, an interference check unit 34 that performs interference check between a mobile member and an interfering object along the moving path generated by the acceleration/deceleration simulating unit 30 and determines whether any interference may occur, a delay unit 32 that successively stores moving commands generated by the function generation unit 16 and successively outputs a moving command having been stored a predetermined time before, and a moving command blocking unit 36 that sends the moving command output from the delay unit 32 to the acceleration/deceleration units 18x and 18z if the interference check unit 34 determines that there

Abstract: When causing manual movement of a moving section of a machine tool, shape data of the moving section is made to move in a movement direction that has been input manually, and it is confirmed whether there is no interference with shape data of a surrounding interfering object. If interference occurs, a position returned a specified distance from the position where interference occurs is made a stop position, the moving section is moved to this stop position, and stopped at that position.

Abstract: The invention enables an abnormality of a temperature sensor to be simply detected. In S1, a temperature measurement is performed with each temperature sensor, and measured signals are digitalized to obtain a temperature value. Then, in S2, a detection temperature Tb? equivalent to a detected temperature of a corresponding temperature sensor is calculated with use of an arithmetic expression and a characterization factor stored in a parameter storage device, and in S3, an absolute value ?T of a temperature difference between Ta and Tb? is obtained. Subsequently, in S4, the calculated absolute value ?T is compared with a limit value ?, and when ?T is larger than the limit value ?, Ta or Tb is determined to be abnormal and an alert is issued with an alarm or the like in S5, followed by issuance of a command to a correcting device in S6 not to change a correction amount set before the abnormality occurs.

Abstract: Before applying a software object such as virus detecting software to a customer's real time control apparatus, in order to verify an effect on real time control of the software object, the software object is downloaded from a first web site to a verifying real time control apparatus, and the software object is applied to the verifying real time control apparatus to evaluate whether the customer's real time control apparatus stably maintains the real time control or not. The software object which has been evaluated as one capable of maintaining a stability is uploaded to a second web site, and made to be applicable to the customer's real time control apparatus. Moreover, an observation computer observes whether the verification is performed normally or not.

Abstract: A motor controller is provided which has a function to prevent the falling of a shaft when the power supply to a motor is turned on. The motor controller includes a PI control unit 1 which controls the velocity of a motor 4; a brake 8 which prevents the falling of the shaft in accordance with a brake signal; and a storage unit 7 which detects the brake signal input to the brake 8, and on the basis of the state of the detected brake signal, stores a torque command value T* calculated by the PI control unit 1. The storage unit 7 stores the torque command value T* when the brake signal has changed from off to on, and the storage unit 7 sets the stored torque command value T* to an integral component of the PI control unit 1 when the brake signal has changed from on to off. Thus, the falling of the shaft at the start of power application can be prevented.

Abstract: In order to cope with many rotor diameters using a single type of stator portion, two stator portions, each having a built-in signal processing circuit for detecting absolute positions independently, are disposed in opposition at positions which differ from each other with respect to a rotational center of a rotor portion. When one of the stator portions receives a request command RX from an external device, it transmits a detected serial communication signal. The other stator portion receives the transmitted serial communication signal, determines a position detection abnormality, and notifies the abnormality to the external device when a difference between the received absolute position and the absolute position detected by the other stator portion exceeds a deviation previously set for 180 degrees.

Abstract: An electrically-operated chuck opening-closing device includes a chuck that grasps workpiece, a conversion device with a control gear provided to the outer circumference, a drawbar that couples the conversion device and the chuck, a transmission gear provided to a main spindle, a second rotary shaft rotatably pivoted to be parallel to the main spindle, a first gear and a second gear rotatably provided on the second rotary shaft, an auxiliary motor that drives the first gear, a first clutch that can couple and decouple the auxiliary motor and the second rotary shaft, and a second clutch that can couple and decouple the second rotary shaft and the second gear.

Abstract: A stable rotation speed is acquired by finely changing a rotation speed of a rotary shaft 3 based on an expected stable rotation speed, and calculating an amount of change of a k? number, and the like. Therefore, a more accurate rotation speed can be acquired, and “chatter vibration” generated during machining can be suppressed more effectively than a conventional method. As a result, a quality of a workpiece surface can be improved, and a tool wear and the like can be suppressed.