Electroformed thin-wall core drills impregnated with abrasives
AssigneeKim & Ed Pte Ltd
InventorEdward Robert Perry
Life of this patent
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Abstract
The present invention describes electroformed thin-wall nickel core drills that are impregnated with diamond abrasives. The thin-wall core drills are formed with a plurality of raised portions and an equal plurality of recessed portions, with each raised portion alternating with a recessed portion, the raised and recessed portions are substantially parallel and are connected by transition portions. In another embodiment, some of the transition regions are formed with intermediate steps or partially raised and recessed portions. These intermediate steps or partially raised or recessed portions allow more uniform distribution of matrix material across a kerf width D1 as the core drill is spun, thereby, giving the cut edge a substantially square profile.
Claims16
An abrasive impregnated core drill comprising:
- a thin-wall corrugated nickel electroform having a plurality of raised portions and an equal plurality of recessed portions, with each raised portion alternating with a recessed portion, the raised and recessed portions are substantially parallel and are connected by transition portions so that a top surface of the raised portions and an opposite surface of the recessed portions define two continuous cutting edges with a kerf width D1, of 100-250 microns, matrix thickness T of 50-130 microns, and relief depth D2;
- wherein the inclination of the transition portions is in the range of 30 to 60 degrees;
- and
- abrasive particles impregnated in the thin-wall corrugated nickel electroform.
An abrasive impregnated core drill, comprising:
- a thin-wall corrugated nickel electroform having a plurality of raised portions and an equal plurality of recessed portions, with each raised portion alternating with a recessed portion, the raised and recessed portions are substantially parallel and are connected by transition portions so that a top surface of the raised portions and an opposite surface of the recessed portions define two continuous cutting edges with a kerf width D1, matrix thickness T and relief depth D2;
- and
- abrasive particles impregnated in the thin-wall corrugated nickel electroform;
- wherein some of the transition portions connecting two adjacent raised and recessed portions are further formed into one or more intermediate steps that are parallel to the raised or recessed portions.
An abrasive impregnated core drill, comprising:
- a thin-wall corrugated nickel electroform having a plurality of raised portions and an equal plurality of recessed portions, with each raised portion alternating with a recessed portion, the raised and recessed portions are substantially parallel and are connected by transition portions so that a top surface of the raised portions and an opposite surface of the recessed portions define two continuous cutting edges with a kerf width D1, matrix thickness T and relief depth D2;
- and
- abrasive particles impregnated in the thin-wall corrugated nickel electroform;
- wherein some of the raised and recessed portions are partially raised or recessed respectively to form one or more intermediate steps that are parallel to the raised or recessed portion, the distance D3 between opposite surfaces of said partially raised or recessed steps is less that the kerf width D1.
Dependencies are inferred from the claim text.