Other

Cincinnati Milacron-heald Corp.

Robert S Hahn

Arthur Francis St Andre

Bruno A Holmstrom

David H Youden

A grinding machine for grinding an internal cylindrical surface of a workpiece in which the workpiece is moved toward a grinding wheel along the axis of revolution of the workpiece and the grinding wheel is moved transversely of the axis of revolution toward the cylindrical surface of the workpiece. The grinding wheel is mounted on a supporting structure which is mounted for pivoting about an axis which is transverse to the axis of revolution. A deflective stiffening element restrains the angular displacement of the supporting structure. The deflection of the stiffening element is proportional to the deflection of the spindle. The deflection of the stiffening element is measured by a sensor which transmits an electrical signal to a drive mechanism for angularly positioning the supporting structure in response to the signal to compensate for the deflection of the spindle. A ring-shaped workpiece is supported on the workhead by a magnetic face plate. The outer surface of the ring is engaged by a pair of shoes to establish a workpiece axis of revolution which is offset from the axis of revolution of the wheelhead. A sensor is mounted on the grinding machine for detecting the position of the outer surface of the ring and for transmitting an electrical signal to a computer for calculating the relative OD size of the ring in comparison to a norm for rings and for controlling the transverse feed of the grinding wheel in accordance with sensed OD size of the ring.

Sensors for internal grinding machines

Grinding machine for finishing a surface of revolution on a workpiece, comprising a computer-controlled program bringing about a rounding-up operation at creep speed by spindle deflection compensation. A sensor is provided that generates an analog electrical signal indicative of the grinding force between the wheel and the workpiece, including a converter for changing the electrical signal to a digital signal. A digital computer is connected to the sensor and also to the actuator for the transmittal of signals therebetween for the regulation of the operation of the actuator. The control device includes apparatus for the measurement of system rigidity and for using this measurement to control the actuator.

Computer-controlled grinding machine

Grinding machine having a plurality of wheelheads for simultaneously grinding internal and external surfaces of revolution on a large workpiece, the machine including a temperature-controlled reference plate.

Grinding machine

A machine tool including a hard brittle tool having a cutting edge and a means for heating the tool adjacent the cutting edge.

Growing community of inventors

Northboro, MA, United States of America

Robert S Hahn