Abstract: The present invention provides a simple method of reducing an incomplete thread portion comprising the steps of: (a) transferring a tool in the direction of the X-axis to position the tool at the point where thread cutting is to be started; (b) transferring the tool in the direction of the Z-axis in synchronization with the rotation of the main spindle to cut threads in work; (c) performing a pullout operation by deceleration in the direction of the Z-axis and acceleration in the direction of the X-axis during a predetermined acceleration/deceleration time Ta so as to retract the tool in the direction of the X-axis; and (d) withdrawing the tool in the direction of the Z-axis to return the tool to the reference point of the thread cutting cycle.

Abstract: The vibration suppressing device includes vibration sensors, a FFT calculating unit, a store device, a calculating unit, and a NC device. The vibration sensors detect a time-domain vibrational acceleration of a rotary shaft during rotating. The FFT calculating unit calculates a frequency of chatter vibration and a frequency-domain vibrational acceleration in the frequency of chatter vibration on the basis of the detected time-domain vibrational acceleration. The store device stores the frequency-domain vibrational acceleration, the frequency of chatter vibration and the like as machining information.

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.

Abstract: The present invention is to provide a machine tool in which appropriate warm-up operation can be performed. Unnecessary warm-up operation before machining is not carried out and damage of bearings caused by the warm-up operation is prevented. A controlling unit stores data of a supply amount of lubricant to bearings and a rotation speed of a main spindle in a memory unit as time-series data. When rotation of the main spindle is started, the time-series data stored in the memory unit is used to calculate an amount of remaining lubricant in the bearings and determination of necessity of warm-up operation is made based upon the stored data. A rotation speed at a start-up time of the main spindle is controlled according to the determination result.

Abstract: There is provided a cutting method for cutting a work by rotating a rotary tool with a circular cutting edge around an axis while a cutting fluid is supplied thereto. Cutting is performed by means of the rotary tool which is rotated in the same rotational direction as an outflow direction of chips, and the rotary tool is rotated at a rotational speed of the rotary tool at which a circumferential speed of the cutting edge is higher than an outflow speed of the chips. Thus, the area of direct solid contact between the rotary tool and the chips is reduced with the aid of a dynamic pressure effect, and the abrasion of the rotary tool is suppressed.

Abstract: A position control apparatus includes a reverse displacement calculation unit configured to calculate a reverse displacement that represents an amount of movement made from a preceding reverse point to a current reverse point by an axis that performs a reversing motion; a reversing-time segmenting number calculation unit configured to compare the reverse displacement to a predetermined value, and, when the reverse displacement is less than the predetermined value, increase a value of a reversing-time segmenting number, which is a coefficient indicating a number of segments per unit time during a reversing motion, and, when the reverse displacement is greater than or equal to the predetermined value, decrease the value of the reversing-time segmenting number; and a quadrant inversion compensation unit configured to automatically adjust a quadrant inversion compensation amount according to the reversing-time segmenting number and perform the quadrant inversion compensation based on the automatically adjusted co

Abstract: A method for controlling deflection caused in a structural member when a force is applied to the structural member is described. The method includes a step of generating rotation torque in the structural member in such a direction as to cancel out the force applied to the structural member. The rotation torque is generated by a motor and a load inertia applying device such as a disc connected to the rotor. A stator of the motor is connected to the structural member and the load inertia applying device applies load inertia to a rotor of the motor.

Abstract: A multi-turn angle sensor includes rotors 60, 62, 64, each of which rotates in a different manner with respect to an input shaft 19, and a common stator portion 66. The rotors and pole teeth disposed around the rotors form each of resolvers 600, 620, 640. At least two of the resolvers are arranged on a single plane vertical to the rotation central axis of each of the rotors. The common stator portion 66 surrounding each of the rotors is formed by laminating electromagnetic steel sheets 106, each of which has an identical shape including a plurality of sets of pole teeth corresponding to each of the rotors. A single length of unspliced electrical wire is wound around each of the pole tooth sets. This facilitates automation of assembly.

Abstract: In a vibration suppressing device provided in a machine tool having a rotary shaft for use in rotating a tool or a workpiece, for suppressing chatter vibrations generated during rotation of the rotary shaft, an arithmetical unit performs an analysis on a vibration of the rotary shaft detected by a detector (vibrations sensors) whenever the vibration is detected and a computation based on a result of the analysis. An operator, while checking results of the analysis and/or the computation displayed in real time in a display unit, manipulates a manipulation element to enter a command to change a rotation speed of the rotary shaft into a rotation speed control unit (NC unit) which controls the rotation speed according to the command entered by the operator through the manipulation element.

Abstract: A linear motor assembly includes two stators extending in parallel and having salient poles arranged at a predetermined interval on opposing surfaces and a mover having three types of mover blocks. The mover blocks are made up of three-phase alternating current coils configuring magnetic poles of three phases and permanent magnets arranged in alternating polarities on two surfaces of the mover blocks opposing each of the two stators. The mover blocks are movable between the two stators along a direction in which the stators extend. A plurality of linear motors are arranged in parallel with respect to a travel direction of the movers, and the stators provided between adjacent movers are integrally formed such that they have said salient poles on the two surfaces opposing these movers.

Abstract: In a machine tool (1) including a supporting device (2) and a tool rest (4), a workpiece (W) is supported rotatably around a first axis (C) by the supporting device (2), and a rotary tool or a boring tool (6) for boring operations to machine an internal surface of the workpiece (W) is coupled, rotatably around a second axis (L1), to a rotary shaft of the tool rest (4). The tool rest (4) is allowed to be turned around an axis (B) perpendicular to the first axis (C), and the boring tool (6) includes a tool holder (7) adapted to be coupled to the rotary shaft and a bit (6a) which is angled with respect to an axis (L2) of the tool holder (7), whereby a boring operation is performed with the tool rest (4) positioned at a predetermined oblique angle with respect to the first axis (C).

Abstract: A turret tool rest is provided with a tool rest body, which is rotatable around the vertical axis, on a lower saddle. A turret is provided on a side surface of the tool rest body, and an anti-vibration mechanism is provided on a side surface that is adjacent to the side surface at a right angle. Indexing can be performed by selecting from the turret and the anti-vibration mechanism by rotation of the tool rest body.

Abstract: A pallet exchanger capable of providing a sufficient operation space on an operator's access side, for example, in front of a machining space, without increasing the size of the exchanger is provided. An arm is formed in a chevron shape in a plane view including two forks as pallet supporting parts, which are arranged radially from a turning spindle with less than 180° angle between them such as 120° . Further, by means of a table, the arm is slidable between a stand-by position in front of a machining space and a retreating position laterally separated by a predetermined distance from the stand-by position in a horizontal position. By moving the arm on the retreating position side, an operation space can be provided in front of the machining space.

Abstract: A control apparatus for a reluctance type synchronous motor wherein slit-shaped gaps or a nonmagnetic material are included within a rotor to provide level differences of the magnetic reluctance in a rotating direction, and a permanent magnet is included at a portion of the slit-shaped gaps or the nonmagnetic material to provide magnetic polarities at a rotor surface. The control apparatus includes a q-axis current calculation unit, a d-axis current calculation unit, a speed coefficient calculation unit, a q-axis current compensation value calculation unit, and an output unit which outputs a compensated q-axis current command value in which the calculated q-axis current compensation value is added to the q-axis current command value.

Abstract: In a machine tool, a support member to which a headstock is mounted movably in an upward-downward direction is movable so as to change a position thereof in a horizontal direction relative to that of a bed. A guide member is provided on the bed and configured to guide the support member. An engageable portion at which the support member is supported by the guide member is located in the support member at a level within a range of upward-downward movement of the headstock along the support member.

Abstract: A method for identifying geometric errors with respect to at least two translational axes and at least one rotational axis of a machine using a control device is disclosed. The method comprises the steps of: measuring positions of a jig in three-dimensional space using a position measurement sensor, wherein a measurement is carried out when the jig being indexed around the rotational axis by a plurality of angles is located at the positions; approximating a plurality of measured values of the positions measured in the measuring step to a circular arc; and calculating an error in regard to a center position of the rotational axis and/or a tilt error in the rotational axis, and tilt errors in the translational axes, based on the circular arc resulting from the approximating step.

Abstract: A tool magazine includes: a rotary shaft; and a plurality of tool gripping members radially extending around the rotary shaft. The tool magazine is configured to transfer tools between the tool gripping members and a tool attachment portion of a machine tool. The plurality of tool gripping members are arranged such that two tool gripping members are at least partially adjacent to each other and disposed in different heights in a direction of the rotary shaft, so that a tool is transferred between one of the two tool gripping members and the tool attachment portion without interference of the tool attachment portion against a tool gripped by the other one of the adjacent tool gripping member.

Abstract: A pallet transfer system capable of smoothly transferring a pallet between a machine tool and a pallet conveying device is provided. The pallet transfer system includes an intermediated station to temporally place a pallet between a front ward position of a pallet stand-by position and the pallet stand by position. The pallet on a conveying plate at a stand-by position is carried to a temporary placing position by horizontally moving the conveying plate. Then the pallet is transferred to the intermediate position by being supported by lift arms which are raised from the conveying plate. Further, the pallet, supported by the lift arms, is transferred from the intermediate station to a stacker crane by advancing the stacker crane toward the intermediate station side and entered into an entering space below the pallet.

Abstract: In a linear motor, the stators and sliders are arranged to fill a predetermined relationship. In one configuration, two stators each include a plurality of stator blocks arranged in a moving direction of sliders so that projecting poles are maintained at predetermined intervals. Boundary surfaces are formed in adjacent stator blocks so as to be displaced relative to one another between the two opposite blocks by a distance Ld in the moving direction of the sliders. When a distance between end surface of the slider blocks is defined as L and the overall length of one stator block is defined as L0, the components are arranged such that Ld>L/3 and (L0?Ld)>L/3.

Abstract: In an outer ring, a plurality of lubrication oil flow paths which penetrates from an outer circumference surface of the outer ring to an inner circumference surface (in particular, raceway groove) are provided. Opening positions of the each lubrication oil flow paths are made different in a width direction being orthogonal to a rolling direction of a ball. At least one of the lubrication oil flow paths is used as a lubrication oil supply path, and a lubrication oil discharge path is selected from the other lubrication oil flow paths to adjust a range of lubrication oil amount, so that an amount of lubrication oil in the raceway groove is controlled.