A machining device threads a workpiece by relatively rotating the workpiece and a multi-blade tool and relatively moving them along a feed direction to perform cutting processes in the radial direction of the workpiece along the same cutting path in a predetermined spiral form. A controller performs a groove machining to form a threaded portion with vibration in the radial direction of the workpiece and a finish machining to form the threaded portion by bringing the multi-blade tool into contact with the grooved portion of the workpiece. The multi-blade tool has a first cutting blade and a second cutting blade arranged side by side along the feed direction. The controller sets amplitude of a vibration waveform to a value at which a cutting edge of the second cutting blade does not come into contact with the screw bottom surface of the workpiece in the finish machining.

A machining device threads a workpiece by relatively rotating the workpiece and a multi-blade tool and relatively moving them along a feed direction to perform cutting processes in the radial direction of the workpiece along the same cutting path in a predetermined spiral form. A controller performs a groove machining to form a threaded portion with vibration in the radial direction of the workpiece and a finish machining to form the threaded portion by bringing the multi-blade tool into contact with the grooved portion of the workpiece. The multi-blade tool has a first cutting blade and a second cutting blade arranged side by side along the feed direction. The controller sets amplitude of a vibration waveform to a value at which a cutting edge of the second cutting blade does not come into contact with the screw bottom surface of the workpiece in the finish machining.

Provided is a control device for a machine tool, the control device being capable of more appropriately and easily determining a swing condition. A control device 10 for a machine tool for swinging a work piece and a tool relatively to each other to perform machining, the control device 10 comprising a storage unit 15 which stores correspondence between a machining condition and a swing condition, the machining condition being at least one of specifications of the work piece, specifications of the tool, a machining method and a machining shape, a swing condition determination unit 16 which selects a swing condition to be used for the machining on the basis of the correspondence stored in the storage unit 15, and a swing command generation unit 18 which generates a swing command on the basis of the swing condition selected by the swing condition determination unit 16.

Methods of inducing segmented flow in a material in which a ductile flow mode would otherwise occur during machining. A monolayer molecular film is formed on a surface of a body of a material in a state such that the material exhibits ductile flow when subjected to shear. The monolayer molecular film has molecules each having a head group adsorbed to the surface, a terminal group, and a hydrocarbon chain therebetween having a chain length of greater than 6. A surface portion of the body is removed by engaging the body with a tool in a contact region below the surface of the body and moving the tool relative to the body to remove the surface portion and the monolayer molecular film thereon. The monolayer molecular film induces segmented flow in the material during the removing of the surface portion.

With a method for cutting a groove-shaped recess in a workpiece, a cutting tool for a machine tool is provided on a workpiece. The cutting tool is displaced into a cutting position, in which the cutting tool is in engagement with the workpiece. The cutting tool in engagement with the workpiece is displaced relative to the workpiece for cutting the groove-shaped recess. Upon cutting, a chip is produced with a predetermined maximum chip length that is less than a total length of the recess to be produced.

With a method for cutting a groove-shaped recess in a workpiece, a cutting tool for a machine tool is provided on a workpiece. The cutting tool is displaced into a cutting position, in which the cutting tool is in engagement with the workpiece. The cutting tool in engagement with the workpiece is displaced relative to the workpiece for cutting the groove-shaped recess. Upon cutting, a chip is produced with a predetermined maximum chip length that is less than a total length of the recess to be produced.

A system for fabricating coded lenses includes a cutting tool configured to controllably cut a workpiece at a specified position-dependent depth while traversing a surface of the workpiece along a specified two-dimensional path. A signal generator is operative to generate a signal for controlling fabrication of a coded lens from the workpiece. A vibration tool is operative to ultrasonically vibrate the cutting tool for cutting of gratings on the workpiece.

Provided is a machine tool control device capable of promptly determining a frequency parameter and an amplitude parameter for a desired oscillation instruction enabling shredding of a chip. A machine tool control device 1 performs machining while causing a tool T and a workpiece W to oscillate relative to each other. The machine tool control device 1 is provided with an oscillation instruction calculation unit 113 that calculates an instruction for an oscillating operation; a first oscillation condition determination unit 111 that determines, as a first oscillation condition, one of a frequency parameter constituted of a frequency or a frequency multiplying factor of the oscillation instruction, and an amplitude parameter constituted of an amplitude or an amplitude multiplying factor of the oscillation instruction; and a second oscillation condition calculation unit 112 that calculates, as a second oscillation condition, the other of the frequency parameter and the amplitude parameter on the basis of the first oscillation condition determined by the first oscillation condition determination unit 111.

Provided is a machine tool control device capable of promptly determining a frequency parameter and an amplitude parameter for a desired oscillation instruction enabling shredding of a chip. A machine tool control device 1 performs machining while causing a tool T and a workpiece W to oscillate relative to each other. The machine tool control device 1 is provided with an oscillation instruction calculation unit 113 that calculates an instruction for an oscillating operation; a first oscillation condition determination unit 111 that determines, as a first oscillation condition, one of a frequency parameter constituted of a frequency or a frequency multiplying factor of the oscillation instruction, and an amplitude parameter constituted of an amplitude or an amplitude multiplying factor of the oscillation instruction; and a second oscillation condition calculation unit 112 that calculates, as a second oscillation condition, the other of the frequency parameter and the amplitude parameter on the basis of the first oscillation condition determined by the first oscillation condition determination unit 111.

A low-frequency vibration machining center includes a cam, a transmission shaft, a roller, a tool holder, a driven follower, and an elastic member. An end of the transmission shaft is coaxially connected to the cam, and another end is provided for connecting to a driving device, which is adapted to drive the transmission shaft and the cam to rotate about a first axial direction. The roller is disposed at a position where the roller touches a cam surface of the cam. A second axial direction is defined to be perpendicular to the first axial direction. The roller and the tool holder are disposed at two opposite sides of the driven follower, respectively. The elastic member provides an elastic force to keep the roller being in contact with the cam surface. When the cam is rotated, the roller is pushed to move the driven follower and the tool holder in the second axial direction.