US 4,286,413 AGranted

Hole grinding machine

AssigneeAktiebolaget Bofors

InventorsHolger Axelsson, Lars Siggelin

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Abstract

A hole grinding machine is provided which includes a frame, two displaceable grinding spindles arranged on the frame, and two chucks facing the grinding spindles for holding and moving workpieces to be machined. The chucks are fastened to rotatable chuck spindles supported by an indexing head which is rotatably supported by a shaft arranged on the frame. The shafts of the chuck spindles are arranged in the same plane and at the same distance from but on either side of the shaft of the indexing head. Between a given pair of machining operations the indexing head is rotated one-half turn so that the chucks change places in front of the grinding spindles. The indexing head is then rotated one-half turn in the opposite direction between the next pair of machining operations, so that the head reciprocates between two end positions. These positions are defined by two fixed stops in the frame and a stopping cleat on the indexing head, the cleat being moved alternatingly into contact with one and then the other of the stops.

Claims10

Dependent claims

An improved indexing head apparatus for use in grinding machines of the type including a frame, a first grinding means mounted on said frame for internal grinding of an axially extending hole in a workpiece and a second grinding means mounted on said frame for grinding internal seats or deadend holes, said apparatus comprising:

a shaft;
means adapted to be mounted on the frame for supporting said shaft for rotation;
a head element mounted on said shaft for rotation therewith;
a pair of chuck spindles mounted for rotation on said head element, said spindles each having a chuck for holding a workpiece in position to be ground by said grinding means;
means for reciprocating said head element and said shaft between two end positions located one half turn from each other whereby each chuck spindle with its associated chuck and workpiece is alternatingly positioned for grinding the workpiece first by the one and then by the other of said grinding means;
a pair of stop means fixed relative to said frame for defining said end positions;
means mounted on said head element for contacting one of said stop means at each of said end positions;
means for disengaging said reciprocating means prior to contact of said head element with said stop means;
and
means cooperating with said contacting means for completing movement of said contacting means into contact with said stop means and holding said head element in such position while grinding is in process.

7 more elements

Dependencies are inferred from the claim text.