Abstract: In an apparatus for multiple-bearing grinding of workpieces, such as crankshafts, wherein a support element seat occurs at a bearing point at the same time as the grinding of the main bearing, a grinding-supporting unit is used that contains a grinding spindle head having at least one grinding disk and support elements in the form of support jaws or support bodies that can be swiveled in. After the support point seat is ground, the support elements are brought into contact there-with and support the workpiece during the further machining. The simultaneous grinding of the support point seat and several bearing points results in a reduction in the machining time in the grinding of the workpiece compared to the prior art.

Abstract: In an apparatus for multiple-bearing grinding of workpieces, such as crankshafts, wherein a support element seat occurs at a bearing point at the same time as the grinding of the main bearing, a grinding-supporting unit is used that contains a grinding spindle head having at least one grinding disk and support elements in the form of support jaws or support bodies that can be swiveled in. After the support point seat is ground, the support elements are brought into contact there-with and support the workpiece during the further machining. The simultaneous grinding of the support point seat and several, bearing points results in a reduction in the machining time in the grinding of the workpiece compared to the prior art.

Abstract: Crankshaft rod bearings are pre-ground and finish-ground in a first grinding station and the crankshaft main bearings are then pre-ground and finish-ground in a second grinding station. The crankshaft is first mounted centered between the two points of the rotary drive. The chuck has two support members which can be moved in the radial direction and which are then positioned against the main bearing in a self-equalizing manner. In the engaged position, the support members are locked tightly to the chuck by locking pins. A pivoting clamping member is then clamped with the operating end thereof against the main bearing.

Abstract: An apparatus has a stirred tank with a stirrer movable upwards and downwards. Oil-containing grinding sludge is introduced into the stirred tank by a supply conduit. Separating agent is introduced into the stirred tank for separating the grinding oil from the grinding sludge. The sludge is discharged into a receiving tank via a discharge conduit. In the stirred tank, a movable annular plate is guided to form a seal on a stirrer guide tube and/or on the inner face of the wall of the tank. The plate has a passage for discharging the grinding oil. A discharge conduit for the de-oiled grinding sludge is at the lowest point of the tank. The stirrer achieves a homogeneous mixture of separating agent and grinding sludge, so that the grinding oil can be separated from grinding particles of the sludge. The grinding oil can then float and be removed.

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: 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: 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: Crankshaft rod bearings are pre-ground and finish-ground in a first grinding station and the crankshaft main bearings are then pre-ground and finish-ground in a second grinding station. The crankshaft is first mounted centered between the two points of the rotary drive. The chuck has two support members which can be moved in the radial direction and which are then positioned against the main bearing in a self-equalizing manner. In the engaged position, the support members are locked tightly to the chuck by locking pins. A pivoting clamping member is then clamped with the operating end thereof against the main bearing.

Abstract: In order to grind bar-shaped workpieces which have a non-circular cross-section and flat faces which are parallel to each other, two partial operations are performed consecutively. First, the bar-shaped workpiece is rough ground and finished on the faces by way of double-disk face grinding. The bar-shaped workpiece is clamped on the longitudinal sides in the first clamping position thereof, and the bar-shaped workpiece is transported between two clamping jaws, which clamp the workpiece in the second clamping position thereof on the faces. The first clamping position is then released, and the bar-shaped workpiece is rotated by the clamping jaws. A CNC-controlled peripheral grinding step is performed based on CX interpolation principles. This rough grinds and finishes the longitudinal sides of the bar-shaped workpiece. Transport from the first to the second clamping position is effected by a clamping station, which concomitantly forms the holder for the face grinding operation.

Abstract: In a method and apparatus for multiple-bearing grinding of workpieces, such as crankshafts, wherein a support element seat occurs at a bearing point at the same time as the grinding of the main bearing a grinding-supporting unit is used that contains a grinding spindle head having at least one grinding disk and support elements in the form of support jaws or support bodies that can be swiveled in. After the support point seat is ground, the support elements are brought into contact therewith and support the workpiece during the further machining. The simultaneous grinding of the support point seat and several bearing points results in a reduction in the machining time in the grinding of the workpiece compared to the prior art.

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: In order to grind bar-shaped workpieces which have a non-circular cross-section and flat faces which are parallel to each other, two partial operations are performed consecutively. First, the bar-shaped workpiece is rough ground and finished on the faces by way of double-disk face grinding. The bar-shaped workpiece is clamped on the longitudinal sides in the first clamping position thereof, and the bar-shaped workpiece is transported between two clamping jaws, which clamp the workpiece in the second clamping position thereof on the faces. The first clamping position is then released, and the bar-shaped workpiece is rotated by the clamping jaws. A CNC-controlled peripheral grinding step is performed based on CX interpolation principles. This rough grinds and finishes the longitudinal sides of the bar-shaped workpiece. Transport from the first to the second clamping position is effected by a clamping station, which concomitantly forms the holder for the face grinding operation.

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: 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: The invention relates to a method for grinding the bearing points and assembled cams of camshafts and for levelling them with the aid of a grinding machine and to a device for carrying out said method, in particular making it possible to carry out a levelling process by means of a levelling device on the same grinding machine after grinding. In particular, when the bearing points are finish-ground with the use of backrests as supports, said supports are first removed from the engagement with the respective bearing points of the camshaft and the concentricity of the bearing points is measured, preferably in a middle area. After determining the concentricity in the middle area, the levelling process is carried out on the grinding machine on the basis of the measured concentricity. The inventive device is also provided with a levelling device integrated into the grinding machine.

Abstract: A rough grinding wheel has a plurality of annular grooves with widths at the surfaces of the grooves that are less than the widths thereof at the bottoms of the grooves. This feature provides a space for fluid during the grinding process. A finishing wheel may be mounted on a common shaft with the rough grinding wheel. The rough grinding wheel is intended for use in a method for grinding the outer contour of a cam wherein the cam is rough-ground with the roughing wheel; after a first radial infeed, the rough grinding wheel is withdrawn and axially displaced for a second infeed; this process is repeated until the cam is rough-ground.

Abstract: A method for grinding the outer contour of a cam wherein the cam is rough-ground with a roughing wheel having circumferential grooves in its surface. After a first radial infeed, the grinding wheel is withdrawn and axially displaced for a second infeed. This process is repeated until the cam is rough-ground. A rough grinding wheel for use in this method has a plurality of annular grooves with widths at the surface of the grooves that are less than the widths thereof at the bottoms of the grooves. This feature provides a space for fluid during the grinding process. A finishing wheel may be mounted on a common shaft with the rough grinding wheel.