Method of making a broach
OwnerFranz Hofeleinventor
Life of this patent
Estimating the term…
Abstract
A broach which has several cutting elements and a support unit to which the cutting elements are attached is made by cutting the cutting elements through electric-discharge machining, in particular wire-EDM so that the production thereof is less time consuming and less expensive. Moreover, the cutting elements can already be made to final size and final hardness.
Claims11
A method of making a broach, comprising the steps of:
- cutting an plurality of suitably graded cutting elements by means of electric discharge between an electrically conductive wire and metal;
- and
- successively arranging the cutting elements on a support unit wherein the cutting elements are of annular shape and are provided at one circumferential side thereof with radially projecting teeth spaced in circumferential direction and wherein the support unit includes an essentially cylindrical body which coaxially supports the cutting elements at axial distance from each other, with the cutting elements being centered by bearing against a circumferential surface of the cylindrical body with one circumferential surface which opposes the teeth, characterized in that the cutting elements are cut out from a metal plate through wire-EDM, with the surface sections which bound the teeth in radial direction being of tapered shape and the surface sections between the teeth being of cylindrical shape.
A method of making a broach for external broaching, with the broach being of the type including a plurality of suitably graded cutting elements, each of which having a central opening defined by an inner peripheral surface, and a cutting edge defined on the peripheral surface, said method comprising the steps of:
- making the cutting elements from metal plates by providing each metal plate with a hole which is smaller than the central opening, and cutting out the central opening from the metal plate along a line surrounding the hole by means of electric discharge between an electrically conductive wire and the metal plate;
- and successively arranging the cutting elements on a support unit.
Dependencies are inferred from the claim text.