Flat bottom tool
DC
First Claim
1. A drilling system comprising a tool having a longitudinal axis, a substantially cylindrical side surface, and a mounting end and a cutting end,said cutting end having at least first and second cutting edge, said first cutting edge extending radially from a position adjacent said longitudinal axis to a first outer end, and said second cutting surface extending radially from a position adjacent said longitudinal axis in a direction opposite said first cutting edge to a second outer end, and including a web extending between said at least first and second cutting edges through said longitudinal axis which connects between said first and second cutting edges, to form a continuous cutting surface, wherein said first and second cutting edges and said web provide said cutting surface.
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Abstract
The present invention is a drilling system for cutting flat bottomed holes in work pieces. The tool has two opposing angled cutting edges extending from a rotational axis, with the inner portions of these cutting edges extending upwardly to create an overlapping web at the center. The overlapping web strengthens the center portion of the cuttings edges of the tool. The angle at which the inner portion of the cutting edge is inclined can be increased to create a center point on the cutting surface of the tool. The center point adds stability to the tool as it rotates along its longitudinal axis. The cutting edge has a rake surface with a positive rake angle that lessens the forces on the insert and also allows for better formation of chips of stock material being removed. Chip breakers can be cut into the cutting edges of the insert, further aiding in the removal of stock material.
62 Citations
15 Claims
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1. A drilling system comprising a tool having a longitudinal axis, a substantially cylindrical side surface, and a mounting end and a cutting end,
said cutting end having at least first and second cutting edge, said first cutting edge extending radially from a position adjacent said longitudinal axis to a first outer end, and said second cutting surface extending radially from a position adjacent said longitudinal axis in a direction opposite said first cutting edge to a second outer end, and including a web extending between said at least first and second cutting edges through said longitudinal axis which connects between said first and second cutting edges, to form a continuous cutting surface, wherein said first and second cutting edges and said web provide said cutting surface.
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2. A drilling system comprising,
a tool holder having a longitudinal axis, said tool holder having a first mounting end and a cutting end, a drill insert having a rotational axis, and being selectively secured to said cutting end of said holder in a position such that said rotational axis is substantially coincident with said longitudinal axis of said holder, said insert having at least first and second cutting edges, said first cutting edge extending radially from a position adjacent said rotational axis to a first outer end, and said second cutting edge extending radially from a position adjacent said rotational axis in a direction opposite said first cutting edge to a second outer end, and including a web extending between said at least first and second cutting edges through said rotational axis which connects said first and cutting edges to form a cutting surface for forming a substantially flat bottom hole in a work piece.
- 8. A drill insert comprising a body member adapted to be secured to a holder for rotation therewith, said body member having a cutting end with at least first and second cutting surfaces having opposed cutting edges, and a web extending between said opposed cutting edges, wherein upon rotation of said insert with said holder, said opposed cutting edges and said web cooperate to form a substantially flat bottom hole in a work piece.
Specification
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- Resources
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Current AssigneeAllied Machine & Engineering Corporation
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Original AssigneeAllied Machine & Engineering Corporation
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InventorsStokey, William H., Nuzzi, Joseph P., Stokey, Timothy G.
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Primary Examiner(s)Howell, Daniel W.
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Assistant Examiner(s)CARTER, MONICA SMITH
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Application NumberUS09/137,647Time in Patent Office795 DaysField of Search408/199, 408/223-225, 408/227, 408/229-231, 408/233, 408/713, 407/114, 407/115, 407/116, 407/54, 407/53US Class Current408/227CPC Class CodesB23B 2251/48 Chip breakersB23B 2251/50 Drilling tools comprising c...B23B 51/00035 Spade drillsY10S 408/713 Tool having detachable cutt...Y10T 407/1948 with cutting edge entirely ...Y10T 407/245 comprising concave surface ...Y10T 408/9065 with central leadY10T 408/909 Having peripherally spaced ...Y10T 408/9098 with means to retain Tool t...
