Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Frictionally engaging sides of opening in work
Patent
1991-05-24
1993-02-02
Howell, Daniel W.
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Frictionally engaging sides of opening in work
408181, B23B 4100
Patent
active
051833654
DESCRIPTION:
BRIEF SUMMARY
This invention relates to machine tools used for the cutting of internal diameters and surfaces of work pieces. Such machine tools are usually referred to as boring machines.
In particular, the present invention relates to a portable boring machine which can be used to machine work pieces on site.
Usually boring machines comprise a solid central shaft or arbor on which a tool post and cutting tool are mounted. The depth cut of a cutting tool is preset by appropriate adjustment of the tool post and the arbor is rotated and advanced into the work piece to cut a diameter.
A significant problem in such an arrangement is that it is impossible to make direct measurements of the cut diameter because of the arbor, and measurements of the cut diameter have to be made indirectly from the surface of the arbor which gives rise to errors in the calculation of the cut diameter.
Also, although in most cases the arbor is a solid shaft it is usually relatively small in diameter and therefore of low inertia which could assist in the machining operation.
Further, boring machines of the type described are relatively inflexible in that they are only capable of machining a limited range of diameters or other surfaces.
The present invention seeks to provide a boring machine, which enables a wide range of diameters and other surfaces to be cut internally of a work piece.
The present invention also seeks to provide a boring machine in which in some embodiments the dimensions of the work piece can be measured whilst the boring machine is in position.
Accordingly the present invention provides a machine tool comprising a carriage rotatably located on a mounting means, the mounting means enabling the machine tool to be positioned in and secured relative to a work piece, the rotatable carriage including a tool carriage mounted for axial movement on the rotatable carriage relative to the axis of rotation of the rotatable carriage, the tool carriage including a tool post mounted on the tool carriage, drive means to rotatably drive the rotatable carriage and to drive the tool carriage axially relative to the rotatable carriage, and to drive the tool post radially relative to the tool carriage, the tool post drive means comprising a drive transmission, and a power source located remotely from the tool post.
The present invention further provides a machine tool comprising a rotatable carriage, the carriage being rotatably located in mounting means at each end thereof, the mounting means enabling the carriage to be positioned in and secured relative to a work piece, a tool carriage mounted on the rotatable carriage for axial movement relative to the axis of rotation of the carriage, a tool post mounted on the tool carriage for radial movement relative to the axis of rotation of the carriage, and common drive means to rotatably drive the rotatable carriage and to drive the tool carriage axially and the tool post radially, the rotatable carriage including at least two arms extending between end supports, the end supports being rotatably located in the mounting means.
The rotatable carriage can include three or more arms which can be equi-spaced, extending between and secured to end plates at each end of the arms.
Preferably the rotatable carriage comprises four or six arms which can be equi-spaced, extending between end plates.
The tool carriage can comprise a central block including attachment arms, each including bearings enabling the tool carriage to move along the arms of the rotatable carriage.
The drive means for the rotatable carriage can comprise one or more fluid motors, which can be air or hydraulic motors, and an appropriate gear transmission to drive the rotatable carriage.
The drive means for the tool carriage can comprise a lead screw driven through an appropriate transmission from the drive means for the rotatable carriage.
The mounting means for the rotatable carriage can comprise a central hub in which is located a bearing arranged to receive a shaft attached to one end of the rotatable carriage, and a number of arms extendin
REFERENCES:
patent: 807755 (1905-12-01), Loyd
patent: 1973386 (1934-09-01), Morgan
patent: 3383957 (1968-05-01), McCann
patent: 4668133 (1987-05-01), Campbell
patent: 4678379 (1987-07-01), Sunday
patent: 4824296 (1989-04-01), Strait
patent: 5030041 (1991-07-01), Marron
Howell Daniel W.
Silk Engineering (Derby) Limited
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