DRILL, METHOD AND DEVICE FOR ITS FABRICATION Russian patent published in 2014 - IPC B23B51/02 B23P15/28 B28D1/14 

FIELD: process engineering.

SUBSTANCE: set of inventions relates to machine building and can be used at percussion drilling of holes in concrete and in drill production. Drill comprises rod with spiral (6) and drilling head (9) composed of hard alloy part fitted in jointing groove (4) of rod (5). Base (4a) of jointing groove (4) extends along curve (4b) of the groove base. Transition surface (11) is arranged for axial transition to spiral (6) by surface curves (12) composed at parallel shift relative to at least one segment of curve (4b) of the groove base with straight line of direction. Transition surface (11) extends axially starting from top edge area of connection groove (4), at least at sections through more than half the depth of connection groove (4). Transition surface contour (11) is, in fact, trapezoidal. Invention covers the method and device for drill production.

EFFECT: simplified fabrication, higher quality and durability of the drill.

10 cl, 8 dwg