Cutters – for shaping – Including holder having seat for inserted tool – With separate means to fasten tool seat to holder
Reexamination Certificate
1999-03-04
2001-02-13
Tsai, Henry (Department: 3722)
Cutters, for shaping
Including holder having seat for inserted tool
With separate means to fasten tool seat to holder
C407S107000, C407S109000, C407S117000
Reexamination Certificate
active
06186704
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a toolholder for cutting inserts used for metalworking operations and, more specifically, a blade which secures a cutting insert and is removably attached to the toolholder.
2. Description of the Related Art
During a metalworking operation in which a cutting insert is used to produce a slot for grooving or for cutting off a workpiece, the thickness of the slot imparted by the cutting insert dictates the thickness of the toolholder supporting the cutting insert. As an example, if a cutting insert must penetrate a workpiece to a depth of two inches in order to perform a cutting operation, then at least two inches of the toolholder must also extend within the slot created by the machining operation. It is not unusual to create a groove having a thickness of less than one-sixteenth inch and, as a result, the associated portion of the toolholder must be slightly less than one-sixteenth inch to clear the machined slot. Because of this low thickness, the toolholder may be relatively fragile and any unexpected forces upon the toolholder may be sufficient to damage the toolholder.
When a portion of the toolholder supporting the cutting insert is an integral part of the toolholder, and when the toolholder is damaged and must be replaced, the entire toolholder must be replaced. This is expensive and inconvenient even when the toolholder is a relatively simple and conventional square shank toolholder. However, it is especially expensive and inconvenient when the toolholder is of a type designed for quick change applications. Under these circumstances, the end of the toolholder opposite the cutting insert may be intricately machined so that it may be relatively easily mounted and dismounted within the spindle of a machine tool. For that reason, replacement of such a toolholder can be very expensive.
U.S. Pat. No. 4,898,054 to Bystrom et al. discloses an arrangement utilizing a planar elongated blade with top and bottom angled surfaces which engage matching surfaces on the toolholder. The arrangement also utilizes a wedge to clamp a protruding portion of the blade against the toolholder. Not only is the design of the blade relatively complex but the trailing portion of the wedge 12 is not laterally supported at the end of the blade opposite the cutting insert.
U.S. Pat. No. 5,688,080 to Hedlund is directed to a removable blade utilizing bolts extending through the side of a blade to secure the blade within a toolholder. The blade has a cavity which mates with a projection from the toolholder to provide additional lateral support from the blade. However, just as before, this arrangement provides little lateral support to the blade.
A design is therefore sought for a detachable blade on a toolholder whereby the detachable blade is amply supported in both lateral and vertical directions to resist forces imposed upon the blade during a machining operation.
SUMMARY OF THE INVENTION
The invention is directed toward a toolholder for securing a blade designed to hold a cutting insert, wherein the toolholder is comprised of a toolholder body with a toolholder top face, a toolholder end face and a toolholder side face. The toolholder also has a pocket extending into the toolholder body wherein the pocket has a pocket bottom wall, a pocket end wall, and a pocket side wall. The pocket side wall is recessed from the toolholder side face and the pocket bottom wall extends inwardly and downwardly from the toolholder side face to the pocket side wall to form an acute angle TA with a line perpendicular to the pocket side wall. The pocket end wall also extends inwardly and rearwardly from the toolholder side face to the pocket side wall to form an acute angle TB with a line perpendicular to the pocket side wall.
Another embodiment of the invention is directed to a blade for holding a cutting insert, wherein the blade may be mounted within a pocket of a toolholder, comprised of a blade body having a blade first side and a blade second side which are generally parallel to and opposing each other and defining a width therebetween. The blade body also has a blade first end and a blade second end between the sides wherein the blade first side is suitable to receive and secure therein a cutting insert along with a blade top wall and a blade bottom wall between the sides. The blade bottom wall is comprised of a sloped flat extending downwardly from the blade first side toward the blade second side to form an acute angle BA with a line perpendicular to the second side and wherein the blade second end is comprised of a canted flat extending inwardly and rearwardly from the blade first side toward the blade second side to form an acute angle BB with a line perpendicular to the blade second side.
In yet another embodiment of the invention, a toolholder assembly is comprised of the toolholder and blade previously described.
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Kennametal Inc.
Meenan Larry R.
Tsai Henry
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