METHOD FOR BROACHING EARS OF PART SUCH AS STEERING FORK AND BROACHING UNIT FOR PERFORMING THE SAME Russian patent published in 2008 - IPC B23D37/00 B23D43/02 

FIELD: machine engineering, working non-rigid parts in vertical broaching machine tools.

SUBSTANCE: method comprises steps of working planes of part due to translation motion of cutting teeth of outer and inner sets of broaching tools. In order to improve quality of worked part, it is worked during two stages. At first allowance is taken out by means of first teeth of outer and inner chamfering sets of broaching tools while simultaneously outer planes of part ears are used for resting upon them and then inner sets of broaching tools are driven to operation for working inner planes while simultaneously process for working outer planes is going on. Broaching unit is in the form of cartridges mounted along edges of tool plate and having broaching tool sets mounted in them and providing free outlet of chips. In central portion of said plate cartridges with inner sets of broaching tools are mounted. In order to achieve the same technological result, outer and inner chamfering sets of broaching tools are made according to generating system of cutting and inner set of broaching tools is made according to profiling system of cutting.

EFFECT: improved quality of worked parts.

4 cl, 9 dwg