Abstract: A controller uses detection information of a contact sensor or time-series data of a detection value related to a drive motor included in a rotation mechanism and/or a feed mechanism to acquire a coordinate value when a cutting tool comes into contact with a to-be-cut object or a component. The controller determines a relative positional relationship between the cutting tool and a rotation center of the to-be-cut object based on coordinate values when the cutting tool comes into contact with the to-be-cut object subjected to turning work or a reference surface whose relative positional relationship with the rotation center of the to-be-cut object is known at least at two positions different from a rotation angle position of the cutting tool during the turning work.

Abstract: A motion controller moves a cutting tool relative to a workpiece in a direction in which the cutting tool and the workpiece come into contact with each other while imparting rotary motion or motion along a predetermined locus to one of the cutting tool or the workpiece. An acquirer acquires a signal indicating whether the cutting tool and the workpiece are in contact with each other. A processor specifies a section during which the cutting tool and the workpiece are in contact with each other from the signal acquired by the acquirer and specifies a relative positional relationship between the cutting tool and the workpiece from the section thus specified.

Abstract: A feed mechanism moves a workpiece relative to a cylindrical machining region of laser light. A light receiver receives the laser light that has passed through without being used for machining the workpiece. An intensity detector detects light intensity of the laser light thus received. A controller detects the end of machining on the basis of the light intensity thus detected.

Abstract: A control device moves a cutting tool relative to a workpiece to bring the workpiece and the cutting tool into contact with each other, and acquires a coordinate value of a reference point when the workpiece and the cutting tool come into contact with each other. The control device derives an error between the coordinate value thus acquired and a design coordinate value of the reference point at a position where the workpiece and the cutting tool come into contact with each other, and outputs information on the error.

Abstract: A spindle motor rotates a spindle to which a cutting tool is attached. A feed mechanism moves the cutting tool relative to a thin workpiece. A machining apparatus repeatedly performs a first process of causing the feed mechanism to feed the cutting tool relative to the thin workpiece in a height direction of a rising wall to perform a plunge process on the thin workpiece, and a second process of causing the feed mechanism to feed the cutting tool relative to the thin workpiece in a width direction or the height direction of the rising wall to perform a finishing process on the thin workpiece.

Abstract: A low toughness workpiece cutting apparatus, a low toughness workpiece manufacturing method and a low toughness workpiece manufacturing program for predicting an occurrence of defect and/or non-occurrence of defect before a cutting process of low toughness material. A defect prediction device is provided with a storage device, a processor and an interface. The storage device stores tool data that represent physical characteristics and a shape of a tool, cutting data that represent a group of parameters of a cutting process to be performed to a workpiece by use of the tool and material data that represent physical characteristics and a shape of the workpiece. The processor performs an analysis of deformation of the workpiece due to a cutting force and an analysis of fracture due to the deformation, and performs a prediction of an occurrence of defect and/or a non-occurrence of defect of the workpiece due to the cutting process.

Abstract: A rotation mechanism 9 rotates a spindle 2a to which a workpiece 6 is attached. A feed mechanism 8 feeds a cutting edge 4a positioned obliquely relative to a rotation axis of the workpiece 6 in a direction containing a cutting direction component orthogonal to the rotation axis with the cutting edge 4a cutting into the workpiece 6 to machine a surface of the workpiece 6. The cutting edge 4a of a cutting tool 4 has been formed by scanning a cylindrical irradiation region including a focused spot of laser light over a diamond-coated layer of a chip base material.

Abstract: A controller performs a first process of scanning a cylindrical irradiation region including a focused spot of laser light emitted from a laser light emitter to machine a flank face side of a workpiece to manufacture a cutting tool having a plurality of cutting edges arranged in line. In the first process, the controller scans the cylindrical irradiation region along a scanning path that has periodicity and changes a machining depth to form the plurality of cutting edges. The controller further performs a second process of scanning the cylindrical irradiation region including the focused spot of the laser light emitted in a direction different from an irradiation direction of the laser light in the first process to machine a rake face side of the workpiece.

Abstract: A control device acquires first detection values related to control of a motor at a plurality of positions on a first path by moving an object or a tool along the first path with the object and the tool prevented from coming into contact with each other, acquires second detection values related to the control of the motor at a plurality of positions on a second path substantially parallel to the first path by moving the object or the tool along the second path to bring the object and the tool into contact with each other, derives a difference value between the first detection value and the second detection value acquired at each of corresponding positions on the first path and the second path, and detects contact between the tool and the object based on changes in the difference values derived for the plurality of positions.

Abstract: A structure for cooling a rake face of a cutting insert in a region near a tip of a cutting edge. The cutting insert includes a rake face, a cutting edge formed on an outer periphery of the rake face, a base portion that supports the rake face, and an internal cooling path through which fluid for cooling the rake face flows. The internal cooling path includes an introduction flow path and a cooling flow path, and the cooling flow path is disposed behind a region in which a chip of a workpiece comes into contact with rake face. The cooling flow path is provided at a depth of less than or equal to 1.5 mm from the rake face.

Abstract: A machining apparatus machines a surface of a workpiece by feeding, relative to the workpiece, a cutting tool having a plurality of cutting edges A to D with tips of the cutting edges A to D arranged at equal intervals. The machining apparatus performs a cutting process of cutting the surface of the workpiece with the plurality of cutting edges A to D and a feeding process of feeding the cutting tool relative to the workpiece by a predetermined feed amount to form a plurality of grooves on the surface of the workpiece. The predetermined feed amount is set to a length that is not an integral multiple of the interval between the tips of cutting edges.

Abstract: A feed mechanism moves a workpiece relative to a cylindrical irradiation region of laser light. A light receiver receives laser light that has not impinged on the workpiece. An intensity detector detects intensity of the laser light received. A controller identifies a relative positional relationship between the laser light and the workpiece on the basis of the light intensity detected. The controller determines, at timing when the light intensity detected decreases, that the laser light has begun to cut into the workpiece.

Abstract: A cutting apparatus includes a cutting tool having a cutting edge, an excitation part structured to apply excitation to the cutting tool, and a drive part structured to apply a voltage to the excitation part to reciprocate the cutting edge of the cutting tool. The excitation part suppresses residual oscillations by applying excitation that contains an excitation force of components of frequencies higher than a resonance frequency and has an excitation force of the resonance frequency suppressed. The excitation part applies a first excitation, and applies a second excitation after an elapse of a time 0.5 times as long as a resonance period from timing at which the first excitation is applied to suppress residual resonance oscillations.

Abstract: Provided is a method for manufacturing a Fresnel lens mold by performing cutting process on a workpiece with a cutting tool, the Fresnel lens mold having a lens surface and an upright surface alternately arranged. The cutting tool has a first cutting edge having an arc shape with a radius r and a second cutting edge continuous to the first cutting edge. A machining apparatus repeatedly performs a first process of forming, with the first cutting edge, a lens mold surface serving as a mold of a lens surface of a Fresnel lens, and a second process of forming, with the second cutting edge, an upright mold surface serving as a mold of an upright surface of the Fresnel lens to manufacture the Fresnel lens mold.

Abstract: A motion mechanism moves a workpiece relative to a cutting tool with a convex cutting edge. A controller controls the relative movement between the workpiece and the cutting tool by the motion mechanism and an orientation of the cutting tool. The controller intermittently or continuously changes the orientation of the cutting tool to cause a part of the cutting edge that has not been used for cutting to form a finished surface.

Abstract: A first optical member including a reflection mirror and a lens forms a first optical path of laser light. A second optical member including a reflection mirror, a lens, and a reflection mirror forms a second optical path of laser light. A motion mechanism moves a cutting edge of a cutting part relative to the first optical path and the second optical path. A controller causes the motion mechanism to move the cutting edge relative to the first optical path to machine a flank face of the cutting edge with laser light passing through the first optical path. The controller further causes the motion mechanism to move the cutting edge relative to the second optical path to machine a rake face of the cutting edge with laser light passing through the second optical path.

Abstract: Provided is a cutting method of cutting, with a diamond cutting tool, a metal material having at least a solid solution layer on a surface, the solid solution layer containing nitrogen atoms as interstitial solid solution atoms. In this method, cutting is performed in a region where a nitrogen concentration is equal to or greater than a predetermined concentration, and cutting is not performed in a region where the nitrogen concentration is less than the predetermined concentration.

Abstract: In a diamond-coated tool, a flank face of a tool base material includes a first flank face continuously extending to a cutting edge, a second flank face located farther away from the cutting edge than the first flank face and located outside the first flank face when viewed from an inside of the tool base material, and a flank face-side stepped portion connecting the first flank face and the second flank face. A diamond-coated layer is provided on the first flank face and the flank face-side stepped portion.

Abstract: A rotation mechanism rotates a spindle to which a cutting tool or a workpiece is attached. A rotation controller controls the rotation of the spindle by the rotation mechanism. A feed mechanism moves the cutting tool relative to the workpiece. The rotation controller alternately exercises acceleration control under which the rotation of the spindle is accelerated to make a speed fluctuation ratio between the current cutting speed and a cutting speed one rotation before at the same rotation position equal to or greater than the first value that is greater than 1 and deceleration control under which the rotation of the spindle is decelerated to make the speed fluctuation ratio equal to or less than the second value that is less than 1.

Abstract: A drill bit includes a cutting edge formed at a distal end of a drill bit body, a chip ejection flute having a rake face on a side adjacent to the distal end of the drill bit body, the chip ejection flute extending from the rake face toward a proximal end of the drill bit body, and a chip guide part provided, on the rake face, extending along an extending direction of the chip ejection flute. The chip guide part has at least one guide groove extending along the extending direction of the chip ejection flute from a ridge portion where the cutting edge is provided or from near the ridge portion.