Cutting insert

Details Cutting insert Cutting insert

1996-04-02

1998-07-14

Howell, Daniel W.

Cutters, for shaping

Including tool having plural alternatively usable cutting edges

With integral chip breaker, guide or deflector

407 11, 407117, B23B 2710

Patent

active

057794014

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS

This application is the U.S. national phase of PCT application PCT/DE94/00896 filed 29 Jul. 1994 with a claim to the priorities of German applications P 43 30 816.3 and P 43 36 055.6 respectively filed 13 Sep. 1993 and 22 Oct. 1993.


FIELD OF THE INVENTION

The invention relates to a cutting insert for chip-removing machining, in particular for turning, milling, plunge-cutting, and boring of a workpiece, having on at least one side a cutting surface with at least one cutting edge and a land extending therearound.


BACKGROUND OF THE INVENTION

Cutting inserts of this type have at least one planar land at a free angle between 0.degree. and 30.degree..
European 0,457,488 describes a cutting insert for a drill bit having four cutting corners, two lands lying on opposite sides of the cutting insert each with a projection adjacent the respective cutting corner, a falling flank, and a part set back relative to the projection. The set-back part is formed by a first region adjacent the cutting edge and inclined thereto at a positive angle of 7.degree. to 20.degree., a second region bordering the lower base edge and inclined at a second positive but substantially smaller angle, and a third region joining the other two regions. The second-lower region is a large surface and engages the side of the workpiece during drilling. This construction gives good support with a small free angle.
During drilling with cutting inserts the cutting inserts are set relative to the longitudinal axis of the bore hole on their supports, that is slightly tipped, so as to achieve greater bit stability and to eliminate vibration.
To stabilize the cutting edge it has been suggested to use a negative land on the cutting surface or to minimize the free angle.
German 3,839,804 describes and illustrates an indexable cutting plate particularly for embossing-blade heads which should produce a particularly smooth ridge- and chatter-free surface during milling. This indexable cutting plate has curved cutting edges with a substantially larger radius than the cutting-edge length with a correspondingly curved cutting surface as well as planar support surfaces whose shapes are parabolic or hyperboloidal.
European 0,414,249 describes a cutting insert whose cutting surface has trapezoidal recesses interrupting the cross section of the cutting edge and grooves that run to the land and extend over their entire length perpendicular to the cutting edge.
German utility model 7,600,988 shows a cutting-insert plate with a toothed cutting-edge shape, with the teeth extending also over the entire land. The same is true for the cutting inserts according to European 9,141,576 and U.S. Pat. No. 5,158,401.
Grooves with widths decreasing perpendicular to the cutting edge are described in European 0,213,494. Finally European 0,094,921 describes a cutting insert with grooves in opposite side faces, the grooves having flanks which are inclined to each other so as to produce a varying trapezoidal width at different spacings from the cutting edge.
A cutting insert is described in European 9,534,450 which has recesses extending from the base to interrupt the edge and having a depth which is twice the maximum wear-mark width. The recesses are supposed merely to serve to conduct a coolant to near the cutting edge.
It is therefore an object of the invention to optimize the geometry of the above-described cutting insert so that it cuts much better. Meanwhile the cutting should be easier to guide and there should be less vibration so as to reduce land wear, chatter, and cut-perpendicular cutting force (perpendicular to the machine spindle) so that a substantially greater service life is achieved. In addition the wear mark width should be reduced. The cutting insert should be producible if possible by metal-powder sintering and/or by isostatic hot pressing or machining.
These objects are attained by the features of claim 1.
Thus the land has at a predetermined spacing from the cutting edge adjacent the land one or more land elements of s

REFERENCES:
patent: 4140431 (1979-02-01), Friedline
patent: 4248553 (1981-02-01), Kraemer
patent: 4992007 (1991-02-01), Satran
patent: 5423639 (1995-06-01), Wiman
patent: 5439327 (1995-08-01), Wertheim
patent: 5549424 (1996-08-01), Bernadic et al.

Affiliated with

Also associated with

Rating

Cutting insert does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cutting insert, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cutting insert will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1875737