Vacuum drilling system and methods
A vacuum drilling system and methods is provided that may utilize both a through tool coolant supply as well as a central vacuum extraction system. The system may include a cutting head provided on a hollow tube and a vacuum source to apply vacuum pressure to the area of the cutting head via one or more chip inlets arranged proximate to the cutting head. Sealed coolant containment channels supply coolant to the area of the cutting head.
1. A drilling system for performing a drilling operation, comprising a body member, a cutting head at the front end of the body member having cutting edges formed thereon to drill a hole in a workpiece, the body member having a central hollow region, and the body member having an outside diameter, the hollow region extending through the body member to the cutting head with at least one opening in the body member adjacent the cutting head, a coolant adapter to provide a coolant fluid through first and second sealed channels on the outside diameter of the body member exterior to the central hollow region, the channels formed by a coolant containment system mated to the exterior of the body to create the first and second sealed channels, the first and second channels providing a, controlled flow of a coolant fluid to the area of the at least one cutting edge, and the containment system further providing one or more air intake channels, and a vacuum source connected to the central hollow region to apply vacuum pressure through the at least one opening and hollow region.
2. The drilling system of claim 1 wherein the coolant containment system includes a containment sleeve mated to a coolant inducer sleeve positioned on the exterior of the hollow body member that together create the first and second sealed channels.
3. The drilling system of claim 1 wherein the first and second cutting edges are provided by at least one replaceable cutting insert mounted in association with the cutting head.
4. The drilling system of claim 3 wherein the first and second cutting edges extending from a position along the rotational axis of the drilling system for double effective cutting.
5. The drilling system of claim 4 wherein openings are provided on the body member to provide an entrance for chips into the hollow region from each cutting edge.
6. The drilling system of claim 2 wherein the coolant inducer sleeve has an inside diameter that contains coolant flow within coolant channels formed on the exterior of the body member and the coolant containment sleeve has an inside diameter to contain coolant flow within the coolant channels formed on the exterior of the body member.
7. The drilling system of claim 2 wherein the coolant inducer sleeve has an opening for passage of coolant from a rotary coolant adapter coupled to the coolant inducer sleeve.
8. The drilling system of claim 7 wherein the coolant inducer sleeve further includes one or more coolant ports for coolant flow into the coolant channels formed on the body member.
9. The drilling system of claim 2 wherein the coolant containment sleeve has an outside diameter provided with a wear resistant area over at least a portion thereof, and further comprising a bushing mounted on the wear resistant area.
10. A method of performing a drilling operation comprising providing a drilling tool having a cutting head at a front end of the tool having cutting edges extending from the rotational axis, and a body member having a hollow central region with at least one opening adjacent the cutting head and first and second channels formed on the outer diameter, and a containment sleeve mated to a coolant inducer sleeve positioned on the exterior of the body member, and providing a coolant adapter to allow a flow of coolant from a coolant source through the coolant inducer sleeve and into the first and second channels formed on the body member and sealed by the containment sleeve mated to a coolant inducer sleeve and wherein the containment sleeve includes one or more air intake channels,
supplying a source of coolant fluid to the coolant adapter and through the sealed channels to the area of the cutting head, and
coupling a vacuum source to the hollow central region to extract cuttings formed at the cutting head and the coolant fluid supplied to the area of the cutting head through the sealed channels.
11. The method of claim 10 further comprising providing an article for machining formed of a continuous chip forming material and mounting the drilling tool in a machining system and machining the article.
12. The method of claim 10 further comprising providing a positive feed and peck machining system and mounting the drilling tool therein and machining an workpiece.
13. The drilling system of claim 9 , wherein the bushing provides for air intake to the air intake channels formed on the outside of the containment sleeve and into the hole being drilled.
14. The method of claim 10 wherein the containment sleeve has an outside diameter provided with a wear resistant area over at least a portion thereof, and further comprising providing a bushing mounted on the wear resistant area to supply air to the air intake channels formed on the containment sleeve during the machining operation.