A cam grinding method includes: a common base circle portion setting step of obtaining an angular range of a common surface based on first cam lift data of a first cam and second cam lift data of a second cam; a first cam grinding step of grinding the first cam; a second cam grinding step of grinding the second cam; and a common base circle portion traverse grinding step of, after the second cam grinding step, moving a grinding wheel in a traverse direction to perform spark-out of an unground part remaining at the boundary between the first and second cams.

A cam grinding method includes: a common base circle portion setting step of obtaining an angular range of a common surface based on first cam lift data of a first cam and second cam lift data of a second cam; a first cam grinding step of grinding the first cam; a second cam grinding step of grinding the second cam; and a common base circle portion traverse grinding step of, after the second cam grinding step, moving a grinding wheel in a traverse direction to perform spark-out of an unground part remaining at the boundary between the first and second cams.

The present disclosure relates to a grinding method for grinding of non-circular workpieces with an improved productivity and quality of the resulting workpiece. The method comprises a first and a second stage. The rotational speed profile of the workpiece in the first stage is controlled with the purpose of maintaining a pre-selected maximum surface temperature of the workpiece during said first stage, and grinding of the workpiece in said second stage is performed while controlling an aggressiveness number of said second stage so as to achieve an intended final surface quality. The present disclosure also relates to a method for determining the processing parameters of such a grinding method wherein the first and the second stage of the grinding method are iterated to thereby determine the processing parameters leading to a high productivity and desired quality of the workpiece after grinding.

A belt-finishing device including a frame. A pressing arm is configured to pivotally mount on the frame. A pressing element, which is used to press a finishing belt against a workpiece surface to be treated, is arranged on the pressing arm. The device is provided with a position detection system for detecting a pressing-arm actual position that deviates from a desired position of the pressing arm. A malfunction or defect of the pressing element is detected by means of the pressing arm actual position that deviates from the desired position of the pressing arm.

A belt-finishing device including a frame. A pressing arm is configured to pivotally mount on the frame. A pressing element, which is used to press a finishing belt against a workpiece surface to be treated, is arranged on the pressing arm. The device is provided with a position detection system for detecting a pressing-arm actual position that deviates from a desired position of the pressing arm. A malfunction or defect of the pressing element is detected by means of the pressing arm actual position that deviates from the desired position of the pressing arm.

A machine tool is configured to receive input data defining a profile to be machined onto a workpiece, with the profile defined in a plane perpendicular to an axis of rotation of the workpiece and non-circular in that plane, and calculate using an evolutionary algorithm a workpiece velocity profile corresponding to the velocities at which the workpiece is to be rotated by the workpiece mount over at least part of a rotation of the workpiece during machining. The machine tool then rotates the workpiece according to the workpiece velocity profile during machining of the workpiece.

A device for finish-machining a workpiece in the form of a crankshaft or a camshaft includes a workpiece holder and a rotational drive configured to rotate the workpiece about a workpiece axis. A first finishing tool is configured to machine a main bearing which is concentric with the workpiece axis. A second finishing tool is configured to machine an additional bearing which is radially offset from the workpiece axis. A first tool drive is configured to generate an oscillating movement of the first finishing tool in a direction parallel to the workpiece axis. A second tool drive is configured to generate an oscillating movement of the second finishing tool which is independent of the movement of the first finishing tool in a direction parallel to the workpiece axis.

A device for finish-machining a workpiece in the form of a crankshaft or a camshaft includes a workpiece holder and a rotational drive configured to rotate the workpiece about a workpiece axis. A first finishing tool is configured to machine a main bearing which is concentric with the workpiece axis. A second finishing tool is configured to machine an additional bearing which is radially offset from the workpiece axis. A first tool drive is configured to generate an oscillating movement of the first finishing tool in a direction parallel to the workpiece axis. A second tool drive is configured to generate an oscillating movement of the second finishing tool which is independent of the movement of the first finishing tool in a direction parallel to the workpiece axis.