Method for grinding the main and rod bearing of a crankshaft by external cylindrical grinding and grinding machine for carrying out the method
AssigneeErwin Junker Maschinenfabrik GmbH
InventorGeorg Himmelsbach
Life of this patent
Estimating the term…
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.
Claims16
A method for grinding main and rod bearings of a crankshaft by external cylindrical grinding in a grinding machine which has workpiece rotary drives and chucks located thereon, comprising:
- a) in a first setup, rough- and finish-grinding all the rod bearings;
- b) then, bringing the crankshaft into a second setup, and rough- and finish-grinding all the main bearings in the second setup;
- c) in both setups, clamping the crankshaft at two unground clamping points which are spaced axially apart from one another and have a rough contour;
- d) in the second setup operating a compensating chuck to effect the rotary drive and cause rotation about a defining geometrical longitudinal axis of the crankshaft;
- e) in the first setup, bringing the defining geometrical longitudinal axis of the crankshaft into line with the rotational axis of the workpiece rotary drive;
- f) at at least one of the two clamping points of the first setup, positioning two supporting members, which are located on a chuck of the rotary drive and are radially movable, at said clamping points and locking said supporting members together in said position to form a support in a configuration of a prism which is operationally fixed to the chuck;
- g) positioning at least one clamping member, arranged radially opposite the supporting members, at the clamping point and thereby securing the position of the crankshaft on the supporting members;
- and
- h) setting the rotary drive of the first setup in rotation, axis of said rotation in the first setup also being the defining geometrical longitudinal axis of the crankshaft.
A grinding machine for external cylindrical grinding of main and rod bearings of a crankshaft, comprising
- first and second grinding stations, each of which comprises a workpiece headstock and a tailstock, driven grinding wheels which can be moved in a controlled manner and chucks for clamping the crankshafts at two unground clamping points which are spaced axially apart from one another and have a rough contour,
- a transporting apparatus for transferring the crankshaft from the first grinding station to the second,
- the first grinding station configured to rough- and finish-grind the rod bearings of the crankshaft, and the second grinding station configured to subsequently rough- and finish-grind the main bearings,
- in the first grinding station, the chucks of the workpiece headstock and the tailstock comprise two radially movable supporting members and, radially opposite the supporting members, at least one radially movable clamping member, all of which are positioned independently of one another against the crankshaft, wherein the two supporting members are arranged in a V-shape with respect to one another thereby forming a support configured as a prism
- and a locking device which locks the two supporting members in a desired position on the chuck in order to form an operationally fixed support,
- the clamping member being locked and positioned when the two supporting members rest against the crankshaft with a defining geometrical longitudinal axis of the crankshaft coinciding with a common rotational axis of the workpiece headstock and the tailstock,
- whereby rotary drive of at least one of the workpiece headstock and the tailstock causes the crankshaft to rotate about its defining geometrical longitudinal axis.
Dependencies are inferred from the claim text.