The invention relates to a method for machining a workpiece by means of a chip-removing tool on a numerically-controlled machine tool, in which the tool is moved relative to the workpiece along tool paths that are formed by means of a sequence of supporting points N, wherein the bounding volume that is produced during the rotation of the tool essentially comprises a point contact in a point of contact with the desired surface of the workpiece when machining the workpiece, and that in addition to the data relating to the supporting point N the data relating to the respective point of contact of the bounding volume with the desired surface of the workpiece are determined and that the tool path is optimized on the basis of the data relating to the point of contact.

To provide a controller for a machine tool capable of shredding chips and capable of performing machining by cutting correctly without implementation of a so-called finishing process. A controller for a machine tool includes: an oscillation command generation unit that generates an oscillation command for causing a work and a tool to oscillate relative to each other in a radial direction of the work based on a condition for oscillation; a movement command generation unit that generates a movement command for causing the work and the tool to move relative to each other for thread cutting of the work; an adder that adds the oscillation command and the movement command; and a determination unit that predetermines whether the oscillation command is to be added to the movement command, is which the adder outputs a superimposed command configured to include one or more types of machining patterns combining an arbitrary number of a total movement command with the oscillation command added, and an arbitrary number of a total movement command without the oscillation command added, in accordance with a result of determination by the determination unit.

To provide a numerical controller for a machine tool capable of shredding chips efficiently along one path by making oscillating motion involving synchronization between multiple axes and intermittently making cutting-out motion and cutting-in motion. A controller is for a machine tool used for thread cutting of a work as a target of the thread cutting using multiple axes, comprising: a movement command generation unit that generates a movement command for the multiple axes; an oscillation command generation unit that generates an oscillation command for causing a work rotary axis, a tool feed axis, and a radial direction motion axis to make oscillating motion involving synchronization between these three axes, the oscillation command being for causing a cutting tool to make motion of departing from the work while making cutting-out motion on the work and make cutting-in motion on the work intermittently; and an adder that adds the movement command and the oscillation command and outputs a total movement command resulting from the addition.

A controller controls a machine tool, which performs thread cutting for a workpiece, according to a machining program. The controller analyzes operating conditions of a cutting-up/cutting-in motion commanded in the machining program and inserts a cutting-up/cutting-in motion created based on the analyzed operating conditions into the thread cutting. In the insertion of the cutting-up/cutting-in motion into the thread cutting, a cycle including a cutting-in operation, a cutting-up operation for separating chips by raising the cutting tool for cutting in the radial direction of the workpiece, and an operation to cause the cutting tool to approach a start position of an immediately preceding cutting-up operation so as not to interfere with the workpiece is repeatedly performed.

Disclosed is a numerical controller that has a cutting in/out motion inserting function and configured to control a machine tool that performs lathe-turning machining in which a cutting tool moves in contact with a rotating workpiece. The numerical controller includes a cutting in/out motion inserting unit that generates a program to perform cutting in/out motion, based on operation conditions analyzed by a cutting in/out motion operation conditions analysis unit and inserts the generated program of performing the cutting in/out motion to a program to perform the lathe-turning machining.

To provide a controller for a machine tool capable of shredding chips in any thread cutting method. A controller for a machine tool comprises: an oscillation condition calculation unit that calculates an oscillation amplitude and an oscillation direction allowing shredding of chips occurring from lathe-turning machining based on an infeed amount in a radial direction of a work and a shift amount in a circumferential direction of the work relative to a last machining path of a tool used for the lathe-turning machining on the work; an oscillation command calculation unit that calculates an oscillation command for causing the work and the tool to oscillate relative to each other based on the oscillation amplitude and the oscillation direction calculated by the oscillation condition calculation unit; and an adder that adds a movement command for moving the work and the tool relative to each other for the lathe-turning machining on the work and the oscillation command.

To provide a numerical controller for a machine tool capable of shredding chips efficiently along one path by making oscillating motion involving synchronization between multiple axes and intermittently making cutting-out motion and cutting-in motion. A controller is for a machine tool used for thread cutting of a work as a target of the thread cutting using multiple axes, comprising: a movement command generation unit that generates a movement command for the multiple axes; an oscillation command generation unit that generates an oscillation command for causing a work rotary axis, a tool feed axis, and a radial direction motion axis to make oscillating motion involving synchronization between these three axes, the oscillation command being for causing a cutting tool to make motion of departing from the work while making cutting-out motion on the work and make cutting-in motion on the work intermittently; and an adder that adds the movement command and the oscillation command and outputs a total movement command resulting from the addition.

To provide a controller for a machine tool capable of shredding chips and capable of performing machining by cutting correctly without implementation of a so-called finishing process. A controller for a machine tool includes: an oscillation command generation unit that generates an oscillation command for causing a work and a tool to oscillate relative to each other in a radial direction of the work based on a condition for oscillation; a movement command generation unit that generates a movement command for causing the work and the tool to move relative to each other for thread cutting of the work; an adder that adds the oscillation command and the movement command; and a determination unit that predetermines whether the oscillation command is to be added to the movement command, is which the adder outputs a superimposed command configured to include one or more types of machining patterns combining an arbitrary number of a total movement command with the oscillation command added, and an arbitrary number of a total movement command without the oscillation command added, in accordance with a result of determination by the determination unit.

A controller controls a machine tool, which performs thread cutting for a workpiece, according to a machining program. The controller analyzes operating conditions of a cutting-up/cutting-in motion commanded in the machining program and inserts a cutting-up/cutting-in motion created based on the analyzed operating conditions into the thread cutting. In the insertion of the cutting-up/cutting-in motion into the thread cutting, a cycle including a cutting-in operation, a cutting-up operation for separating chips by raising the cutting tool for cutting in the radial direction of the workpiece, and an operation to cause the cutting tool to approach a start position of an immediately preceding cutting-up operation so as not to interfere with the workpiece is repeatedly performed.

Disclosed is a numerical controller that has a cutting in/out motion inserting function and configured to control a machine tool that performs lathe-turning machining in which a cutting tool moves in contact with a rotating workpiece. The numerical controller includes a cutting in/out motion inserting unit that generates a program to perform cutting in/out motion, based on operation conditions analyzed by a cutting in/out motion operation conditions analysis unit and inserts the generated program of performing the cutting in/out motion to a program to perform the lathe-turning machining.