Cutters – for shaping – Including cut off tool
Patent
1997-08-07
2000-06-13
Pitts, Andrea L.
Cutters, for shaping
Including cut off tool
407119, 407120, B23B 2716
Patent
active
060741384
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a cutting insert primarily for cutting-off operations. However, if so desired, it may also be used for grooving. Suitably, the insert is made of coated or uncoated cemented carbide, but other hard materials may also be used, such as different ceramic materials and so called cermets.
Cutting-off and deep radial and axial grooving are performed with tools which are normally referred to as parting and grooving tools. Characteristic for inserts and tools of this type is their small axial extension. The reason for this is of course that material for making the tools shall not be unnecessarily wasted, and also to make possible the machining of grooves of a smaller width.
A typical insert for cutting-off is disclosed in Pettersson et al. U.S. Pat. No. 4,801,224. However, for some cutting-off operations, also this insert is too wide, because too much material from the workpiece is wasted in the form of chips. The inserts according to this citation are made with a smallest width of 2 mm, since even smaller insert widths are not considered to be safely fastenable to a holder. Moreover, the inserts become too fragile.
Another cutting insert for cutting-off and grooving is disclosed in Schmidt U.S. Pat. No. 5,529,440. This one has a relatively thin, quadrangular basic shape, with a cutting edge provided in each corner. However, the relation between the insert's extension and thickness is too large to make it tenable. Therefore, it is usually made of high speed steel instead of cemented carbide, which of course results in a considerable deterioration in the cutting performance.
Thus, a first object of the present invention is to construct a cutting insert primarily intended for cutting-off, which makes possible very small cutting widths, for instance down to 0.4 mm.
A second object of the present invention is to provide a cutting-off insert that is as thin as possible but also as strong as possible.
Still another object of the present invention is to provide a cutting-off insert that is as thin as possible and does not make necessary any changes of the other equipment, such as for instance the holder blade.
SUMMARY OF THE INVENTION
These and other objects have been achieved in a surprising way by a cutting insert formed of a hard material and adapted for cutting-off and grooving operations. The insert comprises a holding part and a cutting part projecting from the holding part along an axis. The holding part, which is adapted to mount the insert in a holder, includes top and lower sides. The cutting part includes a reinforcing portion, and a wall extending from the reinforcing portion. The reinforcing portion has a first thickness extending in a direction oriented perpendicular to the axis, and a lower side extending from the lower side of the holding part. The wall extends from the reinforcing portion in a direction away from the lower side of the reinforcing portion. The wall has a second thickness extending in a direction oriented perpendicular to the axis. The second thickness is less than the first thickness. The wall includes a top side and an end surface intersecting one another to form a cutting edge.
Preferably, the second width is from 1/6 to 2/3 of the first width.
BRIEF DESCRIPTION OF THE DRAWING
For illustrative but non-limiting purposes, the invention will now be further described with reference to the appended drawings. These are herewith presented:
FIG. 1 shows a cutting insert according to the invention in a perspective view.
FIG. 2 shows the insert according to FIG. 1 in a side view.
FIG. 3 shows a partial view of the cutting insert of FIG. 1 straight from above.
FIG. 4 shows the section IV--IV in FIG. 3.
FIG. 5 shows the section V--V in FIG. 3.
FIG. 6 shows another embodiment of a cutting insert according to the present invention in a perspective view.
FIG. 7 shows the cutting insert of FIG. 6 in a side view.
FIG. 8 shows a further embodiment of the cutting insert according to the present invention.
FIG. 9 shows the cutting insert ac
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Jonsson Anders
Ovaska Pekka
Pitts Andrea L.
Sandvik Aktiebolag
Tsai Henry W. H.
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