US 9,056,360 B2Granted

Multi-blade cutting and drilling finishing tool

AssigneeGuehring Ohg

InventorsHolger Ast, Lutfi Bozkurt, Peter Sommerfeldt, Jochen Bitzer

Life of this patent

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Abstract

Described is a multi-blade cutting and drilling finishing tool for machining deep or stepped bores. The tool comprises at least a first blade set having a nominal diameter and blades distributed essentially uniformly over the circumference. In order to make it easier to guide the tool along the central axis, a guiding strip set in the form of very accurately positioned cutting inserts is located axially behind the first blade set with respect to the axial direction of the tool in which the tool advances forward to machine the deep or stepped bores. Each of the cutting inserts is aligned with one of the blades of the first blade set in a direction parallel to an axis of the tool, and each of the cutting inserts has a nominal diameter which is smaller than the nominal diameter of the first blade set by essentially twice the size of a lubrication gap forming between the guiding strip set and the deep or stepped bores when the tool is used.

Claims19

Dependent claims

A multi-blade cutting and drilling finishing tool or fine machining tool for machining deep or stepped bores, the tool comprising:

a first blade set having a first nominal diameter and blades distributed essentially uniformly over the circumference;
a guiding strip set axially behind the first blade set with respect to the axial direction of the tool in which the tool advances forward to machine deep or stepped bores, the guiding strip set comprising very accurately positioned supporting inserts, each supporting insert aligned with one of the blades of the first blade set in a direction parallel to an axis of the tool, the guiding strip set having a second nominal diameter that is smaller than the first nominal diameter by essentially twice the lubrication gap that forms between the guiding strip set and the deep or stepped bores when using the tool;
and
a second blade set behind the guiding strip set in the advancing direction, the second blade set having a third nominal diameter, the third nominal diameter being larger than the first nominal diameter.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 13/145,720Filed 12 Nov 2009
Priority: DE 10 2008 056 84012 Nov 2008
Published: US 2012/0321402 A120 Dec 2012
Granted: 16 Jun 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

B23D 77/02
Reaming tools: reamers with inserted cutting edges
B23D 77/14
Reaming tools: reamers for special use, e.g. for working cylinder ridges
B23D 2277/02
Reaming tools: cutting head and shank made from two different components which are releasably or non-releasably attached to each other
B23D 2277/205
Number of cutting edges: six