Method and tool for producing an exact-fit cylindrical bore by removal of material from an existing bore with a finishing allowance
AssigneeAudi AG
InventorsPeter Kopton, Eugen Maurer
Life of this patent
Estimating the term…
Abstract
The provided method and material-removing tool serve for producing an exact-fit cylindrical bore with a high degree of surface quality and a length that may be a multiple of the diameter from an existing bore with a finishing allowance. In order to reduce the time taken for the finishing by means of a reamer to be performed, it is proposed to use a tool in the form of an impact die, which is formed at the front end with a circular or substantially circular cutting edge, the diameter of which corresponds to the nominal diameter of the bore to be produced, and which tapers from directly behind the cutting edge or behind a front region of a certain length.
Claims14
A method for material-removing machining of a cylindrical bore having a length that is a multiple of a diameter of the bore, the method comprising:
- providing the cylindrical bore, which cylindrical bore is a pre-processed bore which includes a finishing allowance,
- peeling off the finishing allowance to a nominal diameter of a finish-machined bore with an impact die that has at its front end a circular or substantially circular cutting edge and that performs an axial stroke in the direction of the length of the cylindrical bore,
- wherein the cylindrical bore is a blind bore, and wherein the impact die is provided with a milling or drilling head attached axially forwardly of the circular or substantially circular cutting edge,
- the method further comprising rotating the impact die to prepare a bottom of the blind bore via the milling or drilling head.
Dependencies are inferred from the claim text.