ATTACHMENT TO LATHE FOR WORKING POLYGONAL SMALL-DIMENSION DEAD DEEP OPENINGS BY PLASTIC DEFORMATION METHOD (WITHOUT REMOVING METAL LAYERS) Russian patent published in 2007 - IPC B23D43/02 

FIELD: machine tool manufacture, production of fastening and locking members.

SUBSTANCE: attachment includes broach with stem tat is fastened by means of screw in spindle with bearing assemblies whose axis together with its body is inclined relative to axis of stem of holder designed for mounting in tail spindle of tail stock of machine tool. In order to enhance operational reliability of attachment, to improve broaching accuracy and quality of worked surface, holder end is inclined by angle equal to inclination angle of axis of said body relative to axis of holder stem. In stem of broach angular groove is formed for engaging with screw at mounting in spindle. Attachment may have spindle with thrust roller bearing assemblies. Stem of holder may be in the form of Morse cone.

EFFECT: improved operational reliability of attachment, enhanced accuracy of broaching, high quality of worked surface.

3 cl, 1 dwg