Boring tool, particularly a reamer

Patent metadata

Field	Value
Publication number	US-9555492-B2
Application number	US-201414774221-A
Country	US
Kind code	B2
Filing date	Feb 7, 2014
Priority date	Mar 11, 2013
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A boring tool includes a clamping shaft and a boring body. Between the end face of the boring body and the clamping shaft, at least one main blade extends along a longitudinal axis of the boring body and includes a blade web with a rake face facing a groove-shaped chip space, and a free surface on the outer circumferential side, these converging at a cutting edge which runs along the boring body longitudinal axis and which removes material on an inner wall of a pre-bored workpiece core bore hole as a result of said boring tool being rotated. The main blade extending along the longitudinal axis of the boring body transitions at the end face, of the boring body into a groove blade that is aligned transversely to the longitudinal axis of the boring body. This groove blade allows the boring tool to be displaced, prior to removing the material by rotation, into the core bore hole in an axial lifting motion such that a groove is formed which extends along the longitudinal axis of the core bore hole, the main blade of the boring tool engaging in this groove.

First claim

What is claimed is:

1. A boring tool, comprising:
a clamping shank; and
a boring body, said boring body having at least one main blade which extends between an end face of the boring body and the clamping shank along a longitudinal axis of the boring body, said at least one main blade having a blade web, said blade web having a rake face facing toward a groove-shaped chip space of the boring body and a free surface arranged on an outer circumference of the boring body, said rake face and said free surface converging at a cutting edge of the at least one main blade, said cutting edge extending along the longitudinal axis of the boring body,
said main blade transitioning at the end face of the boring body into a groove blade having a groove-chip rake face, said groove blade oriented transverse to the longitudinal axis of the boring body,
said groove blade being configured to form a groove in an inner wall of a predrilled core bore of a workpiece during a movement of the boring tool into the pre-drilled core bore along a longitudinal axis of the core bore, said groove extending along the longitudinal axis of the core bore,
said main blade being configured to engage in said groove and to cause a material removal on the inner wall of the pre-drilled core bore of the work-piece as a result of a rotation of the boring tool,
wherein the groove blade has a groove-base cutting edge which at a first blade corner of the main blade converges with the main cutting edge of the main blade,
wherein the free surface of the blade web and the groove-chip rake face converge at the groove-base cutting edge,
wherein the groove-chip rake face is delimited by the groove-base cutting edge and by a first and a second groove-flank cutting edge of the groove blade, each said first and second groove-flank cutting edge transitioning at the first blade corner and at a second blade corner of the main blade into the groove-base cutting edge.

2. The boring tool of claim 1 , wherein the main blade extends with its blade web helically about the longitudinal axis of the boring body at an angle of twist.

3. The boring tool of claim 2 , wherein the boring tool is configured so that the groove is formed helically into the inner wall of the core bore by the axial movement in combination with a rotational movement of the boring tool that is adjusted to the angle of twist.

4. The boring tool of claim 1 , wherein the groove base cutting edge is positioned slanted at an angle of attack relative to a plane which is perpendicular to the longitudinal axis of the boring body.

5. The boring tool of claim 4 , wherein the groove-base cutting edge is positioned so that when viewed in a direction of rotation of the boring tool a leading one of the first and second blade corners is spaced apart from the end face of the boring body by a first longitudinal offset, and a trailing one of the first and second blade corners is spaced apart from the end face of the boring body by a second offset, said first offset being greater that the second offset.

6. The boring tool of claim 4 , wherein the rake face of the groove blade is extended radially inwardly by a chip-guiding surface which pushes chips generated during cutting of the groove into the chip space.

7. The boring tool of claim 6 , wherein the chip-guiding surface is arranged in a slanted position and connects the end face of the boring body with the chip space.

8. The boring tool of claim 7 , wherein the chip-guiding surface is arranged at the angle of attack.

9. The boring tool of claim 6 , wherein the chip-guiding surface is formed by a corner recess at a transition between the end face of the boring body and the blade web.

10. The boring tool of claim 9 , wherein a radially outwardly protruding peripheral web is formed along a circumference of the end face of the boring body, said peripheral web closing the groove-shaped chip space.

11. The boring tool of claim 10 , wherein the main blade protrudes over the peripheral web by a radial offset.

12. The boring tool of claim 11 , wherein the peripheral web is interrupted along the circumference by the corner recess.

13. The boring tool of claim 1 , wherein the boring body has at least two said at least one main blade, said at least two main blades being distributed over a circumference of the boring body, and being engageable with a respective groove, wherein the at least two main blades each respectively extend over a first partial groove length and a second partial groove length.

14. The boring tool of claim 13 , wherein the at least two main blades extend over the first partial groove length and the second partial groove length with a slight overlap.

Assignees

• Audi Ag

Inventors

• Kopton Peter

Classifications

• B23D2277/72

  comprising a body having a special profile, i.e. having a special cross section · CPC title

• B23D77/14 Primary

  Reamers for special use, e.g. for working cylinder ridges · CPC title

• B23D2277/32

  Details of the region preceding the axial cutting edge in the direction of feed · CPC title

• B23D2277/36

  with the diameter of the tool decreasing in the direction of the shank from the cutting tip · CPC title

• B23B2251/285

  Cutting teeth arranged at different heights · CPC title