Turning – Process of turning
Patent
1996-04-05
1998-08-11
Pitts, A. L.
Turning
Process of turning
82 47, 82102, 82124, 82127, 407117, B23B 300
Patent
active
057912149
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a tool arrangement and then more particularly, but not exclusively, to a tool arrangement of the kind which includes a parting or cutting-off tool or a tool which fulfills a similar function.
Parting tools, or cutting-off tools, are intended to separate a machined section of raw material held in (a chuck) a holding device, wherein the machined section is related to one end of the still unworked raw material.
The worked or machined section of the raw material is parted from the remainder of the raw material by rotating the parting tool and/or the raw material while moving the parting tool and/or the raw material towards one another, so that the tool moves towards an axially extending center line of the rotary movement and therewith cut a channel or a groove, normally a narrow channel, between the machined section and the unworked raw material in towards, and normally beyond the aforesaid centerline.
DESCRIPTION OF THE PRIOR ART
There are known to the art several different types of tool arrangements that are adapted for numerically controlled cutting machines, such as program controlled lathes, for instance a CNC-Lathe.
With regard to the present invention, it is known to use a tool arrangement which includes a parting or cutting-off tool or a tool having a corresponding function and which is intended to remove a machined section of a workpiece or raw material held in a lathe chuck.
It is also known to the art to fit to the revolving head of a program controlled working machine which is intended to accommodate a plurality of tool rays specific tools of which one is intended to remove a machined section of a workpiece, another is intended to move forwards an unworked length of the raw material immediately after having separated the machined section of the raw material, and others are intended to create conditions whereby after removing the machined section the chuck-held raw material can be moved to a position in which a section of the unworked raw material can be machined while allowing the holding device or chuck to hold the unworked section in this new position. Normally, the unworked section of the raw material or the workpiece is moved by a first set of tools and machined by a second or several second sets of tools, and then parted or cut-off in another machining stage by means of a further set of tools. This method is highly time consuming.
The prior publications SU-1222-540-A, U.S. Pat.No. 3,981,673, U.S. Pat. No. 2,381,657 and GB-A-966644 teach examples of the earlier known state of the art with regard to holding devices which function to move raw material that is being machined.
SUMMARY OF THE INVENTION TECHNICAL PROBLEMS
When considering the known state of the art as described above it will be seen that a technical problem resides in realizing the advantages that are gained when a tool arrangement including a parting tool or like tool which enables the raw material which was previously held firmly by a holding device and which is now loosened to be moved to a new machining position immediately after the parting-operation or parting sequence without needing to make a tool change and thereafter be clamped firmly by the holding device and a section of the raw material is machined in accordance with a set program with the aid of one or more tools in the set of tools mounted in the revolver head or in the tool revolver.
It will also be seen that a technical problem resides in realizing the possibilities that are afforded by the use of a bifurcate or U-shaped device which is located adjacent the parting tool on the side thereof proximal to the raw material and which coacts with said raw material.
Another technical problem is one of realizing that after cutting-off the machined section and after the raw material has ceased to rotate the bifurcate device shall be caused to coact with an edge region of the raw material that lies proximal to the machined section of the raw material or workpiece so that upon axial displacement of the parting tool and the
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patent: 4464958 (1984-08-01), Luks
patent: 4522091 (1985-06-01), Toffolon
patent: 4754671 (1988-07-01), Toffolon
patent: 5165313 (1992-11-01), Karr
Kirkman Christopher
Pitts A. L.
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