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US 2004/0105729 A1Published application
Drilling or milling tool and process for its manufacture
AssigneeSandvik AB
InventorsJosef Giessler, Jonas Svensson
Life of this patent
Estimating the term…
Abstract
A rotary cutting tool includes a cutting part having helical grooves formed in an outer periphery thereof. Each groove forms a helix angle relative to the axis of rotation which gradually transforms into a smaller cutting face angle at a front end of the cutting action.
Claims14
Rotary cutting tool comprising a shank and a cutting part disposed at a front end of the shank and defining an axis of rotation;
- an outer periphery of the cutting part therein cutting grooves extending helically to a front end face of the cutting part;
- the end face including end-face cutting edges formed by an intersection of the end face with respective walls of the grooves;
- wherein a portion of each cutting groove disposed rearwardly of the end face defining a helix angle with a plane containing the axis, the helix angle being larger than a cutting-face angle formed between the end face and a front end section of each cutting groove;
- the cutting-face angle continuously transforming into the helix angle.
1 more element
A process for the manufacture of a rotary cutting tool, the rotary cutting tool comprising a shank and a cutting part disposed at a front end of the shank and defining a first axis of rotation;
- the process comprising shaping a helical groove in an outer periphery of the cutting part by the steps of:
- A) rotating an abrasive disc about a second axis of rotation;
- B) engaging the rotating disc against the outer periphery of the cutting part at a location rearwardly of a front end face of the cutting part with the first axis inclined relative to the front axis;
- C) rotating the cutting part about the first axis during step B;
- D) producing relative axial movement between the disc and the cutting part in a direction parallel to the first axis during steps B and
- C whereby the disc approaches the front end face, along a helix angle;
- and
- E) tilting the disc continuously when the disc reaches a position adjacent the front end face, wherein the groove forms a continuously reducing helix angle toward the front end face.
5 more elements
Dependencies are inferred from the claim text.