Abstract: A gyro sensor is secured to a machine tool. When the machine tool is displaced, the gyro sensor detects rotation of the machine tool. The machine tool has a rotation detecting unit. Based on rotation data obtained by the gyro sensor, the rotation detecting unit determines whether the machine tool has been displaced. If the maximal rotation angle of the machine tool exceeds a predetermined value, the rotation detecting unit determines that the machine tool has been displaced. The rotation detecting unit has history data of the rotation angle recorded in a period from the time at which detection of the rotation angle of the machine tool is started to the time at which such detection is ended. The rotation detecting unit determines whether the machine tool has been displaced using the history data.

Abstract: The NC device of the machining center has the data memory for storing exchange history and data concerning a tool therein when the tool has been manually exchanged. When the data concerning the tool is updated, the data memory also stores update history. The main control unit determines whether the tool is changed on the basis of at least either of the exchange history and the update history. On the basis of a determination result, the main control unit controls the spindle head moving unit to stop the tool as well as allows a caution about the tool to be displayed on the display unit.

Abstract: The invention provides a laser beam machine having a light path duct with improved dust proof property. A light path system 1 of a laser beam machine comprises a light path duct 10 having a U-shaped cross-section with the upper end opened, wherein the opening portion is covered by a steel belt 30. The laser beam extraction unit 50 traveling on the light path duct 10 in the direction of arrow A elevates the steel belt 30 and extracts the laser beam from the light path duct 10. The steel belt 30 has a guiding projection 32 disposed at the center thereof. The laser beam extraction unit 50 has a guide roller 64 disposed below the steel belt 30 and a guide roller 62 having a V-shaped groove 62a for engaging the projection on the steel belt 30, thereby preventing displacement of the steel belt.

Abstract: The invention provides a device for improving the positioning accuracy of a linear motor. A stator 20 is designed to have two kinds of magnets with different surface magnetism arranged alternately and at uniform intervals along the linear moving direction. A moving member 30 is disposed movably in the linear direction while maintaining a uniform distance from the stator. A detector head 50 formed integrally with the moving member 30 detects the magnetic flux of the stator 20 and sends the data to a control unit 60. The fixed laser length measuring machine 100 irradiates a laser beam LB to a target 110 attached to the moving member, and using the reflected light, measures the distance between the laser length measuring machine and the target highly accurately.

Abstract: A method corrects thermal displacement of a machine tool having a rotational spindle. The method includes detecting a rotation speed of the spindle. A thermal displacement amount of the spindle in the current cycle of execution of a program is estimated by using an arithmetic expression that is based at least on the spindle rotation speed and a thermal displacement amount that has been estimated in the preceding cycle of execution of the program. The estimated thermal displacement amount in the current cycle is used as a correction amount for canceling the thermal displacement of the spindle. Therefore, thermal displacement of a machine tool is corrected with no complicated processes when a spindle rotation speed changes.

Abstract: An automatic programming apparatus includes a process division control section, which automatically divides a machining process executed to obtain a predetermined product shape from a material shape of a workpiece. The process division control section computes a removal shape, which is a shape to be removed from the material shape when executing the machining process, based on the material shape and the product shape. The process division control section defines a reference machining boundary that intersects a reference axis defined on the product shape and divides the volume of the removal shape into two equal parts. The process division control section defines, on the removal shape, a process division boundary that intersects the reference axis based on the reference machining boundary and the profile of the product shape. The machining process is divided into a first process and a second process with the process division boundary.

Abstract: A preparing apparatus of an NC machining program prepares an NC machining program including a position instruction of a cutting portion of a rotary tool on the basis of a two-dimensional workpiece coordinate system having a Z-axis and an X-axis as coordinate axes. An operator inputs a lead clearance ? and a radial clearance ? to the preparing apparatus via an input operation section. A processing section converts the NC machining program prepared on the basis of the two-dimensional workpiece coordinate system into an NC machining program including a position instruction of a three-dimensional workpiece coordinate system having the X-axis, a Y-axis and the Z-axis as the coordinate axes, on the basis of the lead clearance ? and the radial clearance ?.

Abstract: A reflector-mirror drive shaft controller is provided for a laser beam machine which optimizes a beam for workpiece thickness by correcting a control axis of a laser reflector-mirror of a laser beam machine. A laser beam outputted from a laser oscillator device of a laser beam machine is reflected by a reflector-mirror via an output mirror and introduced into a laser machining tool. When a machining head moves along an X axis, the reflector-mirror is moved along a U axis parallel to the X axis to keep optical path length constant. By giving an offset ? to U axis control, the incident beam diameter D to the machining lens is varied to form an optimum machining beam for workpiece thickness.

Abstract: When a rotary table rotates, a main control section of a multi-tasking machine detects vibration of the rotary table on which a workpiece is mounted based on fluctuation of a position droop computed by a servo system. The main control section computes the arrangement position (the eccentricity amount and the eccentricity angle) of the workpiece with respect to the rotary table based on, for example, the detected vibration, the weight of the workpiece, and the rotation speed of the rotary table. The main control section computes the attachment position of a balancer with respect to the rotary table based on the computed arrangement position of the workpiece. Therefore, a suitable attachment position of a vibration suppressing balancer with respect to the rotary table is easily obtained.

Abstract: An NC apparatus controls a position of a tool by driving a plurality of shafts with a plurality of servomotors. The shafts includes at least one clamp shaft that can be mechanically clamped or non-clamped. A clamp determining unit determines whether a state of the clamp shaft and outputs a signal based on the state. A correcting unit corrects a position instruction value or a position detection value of at least one shaft other than the clamp shaft based on the signal and a correction value so as to cancel an error in a position of the tool due to movement of the tool performed by the clamp shaft.

Abstract: The NC device of the machining center has the data memory for storing exchange history and data concerning a tool therein when the tool has been manually exchanged. When the data concerning the tool is updated, the data memory also stores update history. The main control unit determines whether the tool is changed on the basis of at least either of the exchange history and the update history. On the basis of a determination result, the main control unit controls the spindle head moving unit to stop the tool as well as allows a caution about the tool to be displayed on the display unit.

Abstract: The invention aims at providing a tool change magazine for laser beam machine to improve machining efficiency of a laser beam machine by installing a tool change magazine containing laser machining tools equipped with a torch and a nozzle replaceably attached to the tip of the torch. A setup station 100 for laser machining tools is installed outside a machining area of a laser beam machine. It includes a tool station 200 of the laser beam machine. The tool station 200 of the laser beam machine is equipped, for example, with four tool change magazines 220. A laser machining tool 60 is returned from a machining head 50 to a tool change magazine 220 and a new laser machining tool 60 from a tool change magazine 220 is mounted on the machining head 50.

Abstract: The invention provides a burr removal apparatus for laser beam machine which removes burrs formed on the top surface of a workpiece. When, for example, pilot holes PH are produced in a workpiece W by a laser machining tool 60, molten particles scatter to form whisker-like burrs Wb on the top surface of the workpiece. A whisker-like burr removal apparatus 700 has a machining head 710 which is raised and lowered by a cylinder 720. It removes the whisker-like burrs Wb with a machining tool 730.

Abstract: A nozzle change magazine for laser beam machine which improves machining efficiency of a laser beam machine by installing a nozzle change magazine for laser machining tools equipped with a torch and a nozzle replaceably attached to the tip of the torch. A setup station for laser machining tools is installed outside a machining area of a laser beam machine. It includes a nozzle station which replaces a nozzle at the tip of the torch. The nozzle change station has a large number of magazines and changes the nozzle at the tip of the laser machining tool.

Abstract: An end surface 820 of a work 80 gripped by a chuck 50 equipped to a main spindle of a lathe-type machine tool is machined, and at the same time has a screw hole 830 formed thereto. The jig plate 60 is provided with a main body 600 having a fixing surface 630 and an inverse tapered portion 610. The jig plate 60 is provided with a bolt 620, and is fixed to the work 80 by a torque wrench tool 70. A chuck claw 122 of a chuck 120 of the second main spindle grips the inverse tapered portion 610 and processes the remaining surfaces of the work.

Abstract: When a command radius r of a circular interpolation control exceeds a threshold value, a computer computes a speed limit for the circular speed at which the acceleration becomes constant. When the command radius r of the circular interpolation control is less than or equal to the threshold value, the computer 100 computes another speed limit for the circular speed at which r?3 or r?4 becomes constant, where ? is the angular frequency. The computer performs the circular interpolation control by safeguarding the circular speed from exceeding one of the speed limits in accordance with the command radius r of the circular interpolation control.

Abstract: A horizontal machining center 1 has a table 20 on a bed 10. An X-axis slidable surface is provided on the bed 10, and a column 30 is driven by a servo motor 32. A spindle stock 40 is supported on the column 30 and is driven along a Y axis extending in a vertical direction. An automatic tool change unit 100 replaces a tool on a spindle 44 on the spindle stock 40 with a tool in a tool magazine. An X-axis cover 200 provided between the table 20 and the column 30 has a plate-like fixed cover 205 and a pair of slidable covers 210. The fixed cover 205 is disposed with one edge thereof passing through an opening 150 formed in the middle of the tool magazine 110. Structured in this way, the horizontal machining center can have a reduced size.

Abstract: The object of the invention is to provide an inverted vertical lathe comprising a device for replacing collets automatically, and having a detector for detecting that the collet has been gripped correctly. A chuck 400 mounted on a headstock 40 grips a collet 500 in a replaceable manner via a tapered bore 430 provided to the end thereof. A collet end face eccentricity detector 600 comprises a detecting member (sensor) 610 fixed to the end of an arm 630. The detecting member 610 detects the eccentricity of the end face 510 of the collet 500 in a contactless manner. A variation pattern of the eccentricity occurring when each collet 500 is gripped correctly by the chuck 400 on the main spindle is detected in advance, and this pattern is compared with the variation pattern of the eccentricity detected by the present detection, and thus, whether or not the collet has been gripped correctly is detected.

Abstract: A method for generating a machining program includes inputting a coordinate value and a machining dimension of a portion to be machined with respect to the axis Z for forming a pair of restricting surfaces. The method includes determining the unit machining shape based on the inputted coordinate value and machining dimension and determining a tool in accordance with the determined unit machining shape. The method includes inputting data about cross-sectional shapes of the portion to be machined and a portion resulting from cutting; generating a machining path; and generating the machining program based on the generated machining path and the determined tool. Therefore, a machining program for forming a cut resulting portion eccentrically projecting is generated in an interactive manner.

Abstract: A process planning apparatus extracts a region to be machined based on the difference of the shape data before and after machining of the workpiece, replaces the extracted region into combinations of the predetermined machining features, allocates a predetermined fixed cycle to each of the replaced machining features, and applies an assessment function relating to a machining time and a life of the end mill to each of the combinations of the machining features to which the fixed cycles are respectively allocated, thereby selecting a group of the fixed cycles which makes an assessment value obtained by the assessment function optimum as the optimal process. By these steps, it becomes possible to design the process for causing the NC machine employing end mills as a cutting tool to perform a predetermined machining of a workpiece without relying on the experience of the designer, and without necessitating complicated work.