In-process compensation of machining operation and machine arrangement
AssigneeAktiebolaget Skf
InventorsJacek Kaminski, Stefan Högnäs, Oscar A. Neguembor
Life of this patent
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Abstract
The present invention relates to a method for performing in-process compensating a machining operation on a workpiece, wherein the compensation process includes generating a control signal representative of magnitude of a contact force exerted on a cutting tool in a normal direction in relation to a machining surface of the workpiece, determining a compensation parameter value based on the control signal, and compensating the machining operation based on the compensation parameter value. The present invention also relates to corresponding machine arrangement for performing a machining operation on a workpiece, such as a hard turning process.
Claims14
A method for compensating a machining operation on a workpiece, the method comprising:
- performing a machining operation which physically removes material from the workpiece by subjecting a machining surface of the workpiece with a cutting tool, and by providing a relative rotational movement and a relative movement between the workpiece and the cutting tool, wherein
- the method further comprises in-process compensation of the machining operation, the in-process compensation comprising:
- providing a cutting tool holder for securing the cutting tool during operation,
- providing a motion device configured to physically drive the relative rotational movement and relative movement between the workpiece and the cutting tool;
- generating a control signal representative of magnitude of a contact force exerted on the cutting tool only in a normal direction in relation to the machining surface, the control signal being generated in response to output from a sensor configured to measure the contact force,
- determining a compensation parameter value based on the control signal, and
- compensating the machining operation based on the compensation parameter value, wherein output from the sensor is continuously monitored such that compensations in the range of zero point five microns to ten microns can be accomplished at a rate of up to fifteen thousand hertz.
A computer readable medium embodying a computer program product for compensating a machining operation on a workpiece, the computer program product comprising code configured to, when executed by a processor:
- perform a machining operation which physically removes material from the workpiece by subjecting a machining surface of the workpiece with a cutting tool, and by providing a relative rotational movement and a relative movement between the workpiece and the cutting tool, and
- perform in-process compensation of the machining operation, wherein the compensation comprises:
- providing a cutting tool holder for securing the cutting tool during operation,
- providing a motion device configured to physically drive the relative rotational movement and relative movement between the workpiece and the cutting tool,
- generate a control signal representative of magnitude of a contact force exerted on the cutting tool only in a normal direction in relation to the machining surface, the control signal being generated in response to output from a sensor configured to measure the contact force,
- determine a compensation parameter value based on the control signal, and
- compensate for the machining operation based on the compensation parameter value, wherein output from the sensor is continuously monitored such that compensations in the range of zero point five microns to ten microns can be accomplished at a rate of up to fifteen thousand hertz.
A machine arrangement for a machining operation of a workpiece, the machining operation providing physical removal of material from the workpiece, the machine arrangement comprising:
- a workpiece holder arranged to secure and rotate the workpiece,
- a cutting tool attached to a tool holder, and
- a motion device for the tool holder,
- wherein the motion device is arranged to place the cutting tool in contact with a machining surface of the workpiece, and to move the cutting tool in relation to the workpiece according to machining operation parameters, wherein the arrangement further comprises:
- a sensor arranged to generate a control signal representative of magnitude of a contact force exerted on the cutting tool in only a normal direction in relation to the machining surface, the sensor configured to measure contact force, and
- a compensation control unit operatively connected to the sensor and arranged to determining a compensation parameter based on the control signal,
- wherein compensation control unit is arranged to provide continuous in-process compensation of the machining operation based on the compensation parameter.
Dependencies are inferred from the claim text.