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Abstract
The paper describes experimental investigation into the internal broaching process and deals with three related sections.
(i) The tendency of a broach to correct misalignments and surface irregularities of the pilot hole. Split workpieces, clamped in a special fixture for machining, enabled measurements and surface traces to be taken after drilling and after broaching. The effect of hole axis inclination, deliberately introduced at the time of drilling was examined.
(ii) The tendency of a broach to drift in a transverse direction was studied by the use of composite workpieces built up of similar and dissimilar materials.
( iii) Work on section ( ii) showed that when broaching a composite workpiece of steel and brass more material was removed from the steel than the brass, i.e. the broach drifterd, transversely, towards the steel. To study this effect further, a broaching dynamometer was used to measure tangential and normal forces during the broaching of composite specimens.