Abstract: Disclosed is a method for grinding a machine part that is used as a drive shaft, for example, rotates about the longitudinal axis thereof during the grinding process, and is provided with a journal at one axial end thereof and a recess at the opposite end thereof. The grinding process is carried out in one and the same grinding machine. In said grinding method, the machine part is brought into different clamped states by means of a chuck of a workpiece spindle head with releasable clamping jaws and a centering tip, a backrest, and/or a tailstock quill. Changing the clamped states has the advantage that the machine part remains in the same position in a single grinding machine, i.e. the clamped position, in all the different clamped states such that more accurate sizes, shapes, and positions can be obtained in an economical manner and all areas of the machine part which are to be ground are successively accessible to the grinding disks.

Abstract: Short and/or rod-shaped workpieces are completely machined by grinding two parallel end faces and the longitudinal sides of the workpiece with very short cycle times. The grinding machine includes two grinding spindles that are arranged in a tandem arrangement with parallel rotational axes on a shared grinding headstock and that are jointly moved in the X direction. In cooperation with a special holding and transport device for the workpieces, two workpieces are each ground, at least partly concurrently, the end faces of the one workpiece being ground in one machining position and the final non-circular grinding of the exterior contour of a second workpiece occurring in a second machining station, the end faces of the second workpiece having already been ground.

Abstract: In the cylindrical grinding of the main and rod bearings of crankshafts, the rod bearings are ground prior to the main bearings. The advantage of this is that the deformations that unavoidably occur, mainly during grinding of the rod bearings due to the removal of ground material are taken into account and compensated for again during grinding of the main bearings. The rod bearings are ground through CNC-control in the pin-chasing grinding method, and the crankshaft is held in a rotating axis in the process, said axis defined by two bearing points in the longitudinal extension of the crankshaft main bearing which are only machined. Deviations in said actual rotating axis from the determining geometric longitudinal axis of the crankshaft are taken into account in the pin-chasing grinding method by the computer of the grinding machine.

Abstract: In a method for the hydrodynamic support and centering of a rotating workpiece during grinding and a steady rest usable for this purpose the bearing to be supported is impinged upon by a contact pressure which changes in accordance with rotational speed from a minimum pressure when the shaft is started from a standstill, to a maximum value during the processing rotational speed. The steady rest has an opening of a transversebore in a central bore receiving a supply line by which a lubricant can be supplied as hydraulic fluid to the bearing. The method is particularly suitable for the processing of camshafts and crankshafts.

Abstract: A grinding method and to a cylindrical grinding machine grinds metal rod that is pushed through a chuck of a workpiece spindle head. Two backrest seats are ground on and two backrests are then seated. The support of an end area enables a front cone to be ground. A grinding wheel comprised of two different individual wheels serves to grind the front cone and is advanced toward the round rod in the X-direction. The front cone is lodged in a hollow punch at a front end of a quill by displacement of the quill. The desired cylindrical grinding a final contour of the end area is done. Working the rod is done with a single chucking and the end area is cut off from the round rod by one of the individual wheels.

Abstract: In an indexable insert having wide sides, inclined narrow sides are to be ground, that is to say the grinding allowance 38 is to be removed. To this end, the indexable insert is set in rotation about a driven axis of rotation between a clamping insert and a thrust bolt. Serving for the grinding is a grinding wheel which rotates about rotation axis and which has a circumferential surface 18a contoured in a circular shape and having a largest diameter and is composed of a leading region and a trailing region. The grinding wheel is guided relative to the indexable insert along the geometrical defining line which is formed by the generating line of the finished narrow side in the feed direction. The leading region tapering forwards effects preliminary grinding of the narrow side by longitudinal grinding, whereas the trailing region effects finish grinding by linear contact with the narrow side. The grinding wheel is held with the clamping flanges on a grinding spindle.

Abstract: A grinding disk base body is fixable to the centering section of a grinding spindle rotor in a centering manner by the base body which includes an inner recess from which two fixed projections project inwardly. The base body also includes a mobile supporting element in the form of a cam disk that is supported on two bearing rods in a recess of the base body. The cam disk has an engagement opening for a torsional tool. When the cam disk is twisted, it can be supported or brought back against the centering section. The cam disk is retracted when the base body is displaced towards the centering section, and is supported against the centering section for the final centering. The fixed projections and the cam disk are preferably arranged in such a way that the action line of the cam disk is in the median line of the fixed projections.

Abstract: In a method for machining rotation pieces, including at least one working step, and wherein at least one surface of the workpiece which is clamped in the device is subjected to a grinding step, at least one front-sided boring is carried out in the workpiece in the same clamping device used for the grinding step. For example, during a grinding process, the workpiece can be clamped at least at both ends in a clamping apparatus, and for the boring process, the clamping apparatus can be released at least at one end and a chuck for a boring tool can be arranged there, which then performs the desired end-face boring.

Abstract: The invention relates to a grinding method and to a cylindrical grinding machine, in which a sintered hard metal round rod is completely pushed through a chuck of a workpiece spindle head, said chuck having chuck jaws. Two backrest seats are ground on the freely projecting end area of the round rod, and two backrests are then placed on the round rod in directions. The resulting secure support of the end area enables a front cone to be ground with a high level of precision with regard to the concentricity at the end of the round rod facing the quill of a tailstock. A multiple grinding wheel, which is comprised of two differently designed individual wheels that directly rest against one another in an axial manner, serves to grind the front cone and is advanced toward the round rod in the X-direction. The multiple grinding wheel is mounted in a grinding spindle. The individual wheels have different grinding areas.

Abstract: A grinding method and to a cylindrical grinding machine grinds metal rod that is pushed through a chuck of a workpiece spindle head. Two backrest seats are ground on and two backrests are then seated. The support of an end area enables a front cone to be ground. A grinding wheel comprised of two different individual wheels serves to grind the front cone and is advanced toward the round rod in the X-direction. The front cone is lodged in a hollow punch at a front end of a quill by displacement of the quill. The desired cylindrical grinding a final contour of the end area is done. Working the rod is done with a single chucking and the end area is cut off from the round rod by one of the individual wheels.

Abstract: A method and a device for grinding a machine part that has two shaft elements, a machine part axis and a large diameter central element having a side surface which is embodied in the form of a flat truncated cone. The machine part is clamped between centers and is movable in a direction of the machine part axis. The side surface is ground by a cylindrical outer contour of a first grinding wheel such that the cutting speed is constant across the entire axial dimension of the first grinding wheel which is mounted on a grinding spindle along with a second, narrower grinding. The second grinding wheel is positioned to grind the shaft element by swiveling the spindle using two pivots that are located perpendicular to each other and by displacing the grinding spindle perpendicular to the machine part axis with the machine part remaining in the same clamped position.

Abstract: A machine part with a conical effective surface, which is machined by means of a device comprising a machine bed, a longitudinally movable grinding bench, and a workpiece spindle head that clamps the machine part by means of clamping jaws via a chuck. The conical effective surface of the machine part is ground by means of a first grinding disk in a vertical grinding mode by longitudinally moving the grinding bench in the direction of the longitudinal axis. The associated grinding spindle head is provided with a first grinding spindle for the first grinding disk and a second grinding spindle for a second grinding disk that is fixed to a grinding arbor. The grinding spindle head is fixed to a grinding spindle carriage so as to be pivotable around a vertical shaft, the grinding spindle carriage being movable in the direction of the x-axis via a displacement motor.

Abstract: The invention relates to a device for grinding rollers, also for grinding hollow rollers. As the rollers tend to vibrate transversally as a result of the contact with the grinding disc, a cushioned body is applied to the opposite side of the roller from the grinding disc, said body being engaged pneumatically against the roller and adapting at least partially to the contours of the roller. The cushioned body consists of an elastic solid material or an elastic external skin that is filled with an elastic pressurized medium. The engagement pressure of the cushion is adjustable. This is achieved by a pneumatic advance cylinder located on a base, said cylinder having a piston that can be impinged on both sides and that bears on its piston rod a fixing plate comprising the elastic cushion. The advance cylinder is connected to compressed air conduits, P indicating the conduit comprising a pressure regulator and L indicating the return conduit in the standard case.

Abstract: An apparatus for grinding center bearings of crankshafts includes a clamping unit for clamping and driving a crankshaft; a grinding spindle, positionable perpendicular to the crankshaft; a plurality of grinding wheels on the grinding spindle, corresponding to the number of center bearings to be ground; a plurality of steadies, for supporting the crankshaft, opposite the grinding spindle; and an additional processing unit for performing preliminary grinding on the center bearing, by forming an elevated bearing seat for the steadies, opposite the bearing, such that the steadies are continuously guidable during grinding of the center bearings. In a method for grinding center bearings of a crankshaft using the apparatus, the center bearings are simultaneously ground using a multilayer grinding wheel set, and prior to a final grinding of the center bearings to their final dimensions, a bearing seat for a steady is ground on at least one center bearing.

Abstract: Method of grinding a concentrically clamped crankshaft, a crankshaft grinding machine for carrying out the method, and a crankshaft of high-alloy steel or cast material. The method provides for pin journals and main journals of the crankshaft to be ground in one set-up such that first, at least the main journals are rough-ground and then the pin journals are finish-ground and after that the main journals are finish-ground. The crankshaft grinding machine forms a machining center by means of which corresponding rough-grinding and finish-grinding is possible in a single set-up.

Abstract: The invention relates to a method for grinding convex running surfaces and exact outside diameters on undulated workpieces. In a clamping, a first convex running surface is ground on a discoid partial section of an undulated workpiece during a first grinding operation while using a first grinding wheel that comprises at least one concave lateral surface. A second grinding wheel is used to grind a desired outside diameter on the discoid partial section as well as on other partial sections of the undulated workpiece during a second grinding operation.

Abstract: A method for controlling the process during rough grinding of a workpiece provides that the workpiece is measured during grinding by a sensor to ascertain an actual size, and the measured actual size is corrected in a continuously automatic manner to attain a predetermined specified size according to grinding time. Additionally, a grinding machine for carrying out the method comprises a grinding wheel for rough grinding a workpiece on a grinding spindle head. The grinding machine also has a sensor for detecting a ground workpiece dimension, and a machine controller. The workpiece is held between a workpiece spindle and a tail spindle. The sensor is arranged primarily in a plane defined by a current contact area of the grinding wheel on the workpiece which rotates, and during rough grinding, the sensor continuously transmits measurement signals to the machine controller.

Abstract: A description is given of an apparatus and a method for grinding a workpiece, in particular a shaft part. According to the method, the workpiece is clamped in place for the grinding working and its geometry is subsequently ground in such a way as to maintain its dimensions and shape. According to the invention, at least part of the surface of the workpiece is precision-worked at least partly at the same time as the grinding. The apparatus according to the invention has a work-spindle headstock and a tailstock for clamping the workpiece in place as well as a grinding unit with a grinding wheel for grinding the workpiece. The grinding unit and workpiece are arranged movably in relation to each other in a controlled manner. The apparatus according to the invention additionally has a precision-working unit, which can be moved according to the geometry of the workpiece in such a way that at least part of the surface of the workpiece is able to undergo precision working.

Abstract: The present invention provides a drive for a grinding wheel of a cam grinding machine, in which case an electric motor is provided with a drive wheel, the drive wheel is provided with equispaced, annular recesses, the annular recesses are fitted on the radial surfaces with permanent magnets, a grinding spindle rotor is provided with equispaced, annular recesses, the radial surfaces of the annular recesses are fitted with permanent magnets, and the annular recesses, fitted with permanent magnets, of the drive wheel and the rotor intermesh.

Abstract: A method and an apparatus are proposed for grinding cams having concave flanks on a camshaft, using a grinding wheel of relatively small diameter, which is used at least for finish-grinding. The axis of the grinding wheel runs at an angle to the camshaft longitudinal axis, and the grinding wheel is aligned at the same angle. In order to achieve a satisfactory running surface, the grinding wheel is tracked along an advance axis running perpendicular to the infeed axis, specifically as a function of the rotational position of the camshaft and of the positioning on the infeed axis.