JP2826969B2 - High speed cutting inserts with improved chip grooves - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to high speed turning inserts having improved chip grooves for use in turning operations.

[0002] The present invention relates to polygonal disposable inserts for turning ductile and superalloy materials at moderate to high speeds at low feed rates and shallow cutting depths.

[0003] The invention further relates to a polygonal indexable cutting insert with an improved chip groove structure for use with an ISO screw fastener for seating the insert in a tool holding pocket.

[0004] The present invention, for increasing the shear force, and high cutting lands along the entire cutting edge, for a right angle curled chips in order to increase the friability of the chip, rounded to the whole
And Tagged switching Rikuzumizo, in use, increasing the strain induced in the chips, and for access to the coolant in order to reduce the thermal shock applied to the insert, the central positioning surface of the connection not communicating chips and crushing the pad to an improved cutting insert comprising a.

[0005]

U.S. Pat. No. 4,856,942 to Bernadic et al.
A polygonal cutting insert for cutting aluminum metal with a rounded cutting corner joined at an angle of 35 degrees is disclosed. The groove recess extending along each cutting edge has a particular geometry with a shallow descending surface followed by a steeply descending surface leading to the bottom of the groove recess. This patent does not disclose the structure of the rounded chip groove of the present invention, nor does it disclose the discontinuous chip breaking pad of the present invention.

[0006] US Patent No. 5,18 to Bernadic et al.
No. 0,258 discloses a high feed rate, deep cutting depth polygon disposable insert for use in aluminum wheel turning operations. The cutting land has toothed cavities along its flanks, reducing friction and allowing for increased material removal rates. A chip breaking pad is provided at each nose of the insert, and the chip breaking pad is directly adjacent to and continuous with the cutting land. Additionally, separate islands are provided to flow the workpiece material therearound and increase the material removal rate.

This patent does not disclose a rounded chip groove structure, nor is it disclosed a discontinuous chip breaking pad separated from the cutting land by the improved chip groove structure of the present invention. Not in that
This is different from the present invention.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to a polygonal, indexable cutting insert for use in turning operations, including turning operations on rollable superalloy materials.
The insert has an upper surface and a lower surface, both sides of which
It is substantially flat and is separated by side walls that extend substantially intact between the two so as to form a body. Since the insert is preferably positive, the angle of the intersection of the side wall and the lower surface is obtuse, measured with respect to the lower surface, and the angle between the side wall and the upper surface forming the cutting edge, provided that they are technically savvy. It will be appreciated that the corner of the intersection with is acute as measured with respect to the top surface. However, the insert can also be designed to be negative, in which case the angle of intersection of the side wall with the upper and lower surfaces is a right angle. The cutting edge extends around the entire circumference of the insert.

[0009] Each side wall comprises side flank, and each flank is defined as a side wall portion extending from one corner of the insert to an adjacent corner. At least two opposing corners across the diagonal of the insert form the nose of the insert.

A positive, flat cutting land entry surface descends from the cutting edge and joins the generally rounded chip groove floor behind the cutting land.
A substantially flat positioning surface is disposed on the top surface and protrudes from the cutting land entry surface around the periphery of the insert. The locating surface surrounds a central hole extending through the upper surface and exiting from the lower surface. The locating surface has an inclined flat chip breaking surface extending along the flank to the chip groove floor.

The insert further has a chip breaking pad on the nose, which protrudes higher than the surrounding cutting edge but lower than the locating surface. No. The nose is discontinuous to the locating surface and has a raised slope that intersects and is behind the rounded chip groove. The chip breaking pad has a substantially flat top shaping surface 50 and is separated from the locating surface by a top shaping channel. The top shaping channel
It allows coolant to flow around the chip breaking pad to cool the insert, thereby reducing thermal shock to the insert during cutting.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, the same reference numerals indicate similar structures, but with particular reference to FIGS.
Includes an upper surface and a lower surface, and both surfaces are separated by sidewalls 16 that extend substantially without breaks therebetween to form a body 18 of the insert. The upper and lower surfaces are substantially flat and substantially parallel to each other.

[0013] The sidewall comprises a flank defined as a portion of the sidewall extending from one corner of the insert to an adjacent corner. Thus, the insert depicted in the drawing has four flanks 20, 22, 24 and 26 extending from corners 21, 23, 25 and 27, respectively. Note that at least two corners opposite each other across the diagonal are nose portions (cut portions) 38 and 40. The flank is substantially flat and intersects the top surface to form a cutting edge 28 extending around the insert.
The flanks intersect each other at an angle of about 33-38 degrees at the nose of the insert, and the non-cut corners 23 and 2
At 7, it intersects the nose at a supplementary angle.

For the purposes of the following discussion, rearward refers to the direction toward the center of the insert with respect to the cutting edge,
Forward refers to the direction away from the center of the insert with respect to the cutting edge.

Aft from the cutting edge, a cutting land entry surface 30 descends and extends around the entire cutting edge of the insert. The cutting land introduction surface is substantially flat, descends from the cutting edge 28, and is inclined in a positive direction with respect to the cutting edge. Preferably, the cutting land introduction surface 30 is inclined at 14 degrees.

Referring to FIG. 3 and FIG. 4, rearward from the cutting land introduction surface, a rounded chip groove floor 3 is provided.
2 are formed, which are rounded concavely. Preferably, the chip groove is better to characterize rounded with a radius of 0.02 inches (0.5 mm). 1 and 2
As seen in FIG. 3, the insert has a locating surface 46, which is shown in FIGS.
Projecting above the periphery of the insert as seen in
It also surrounds a central hole 56 that passes through the upper surface and exits from the lower surface. The central hole 56 is shaped to accept an ISO screw fastener, as is well known to those skilled in the art. The locating surface 46 has a substantially flat seating surface 58 and an inclined flat chip breaking surface 34.
Along the flank of the insert, the chip breaking surface 34 intersects the rounded chip groove floor 32. Preferably, the chip breaking surface 34 is flat and inclined at 35 degrees.

Each nose 38, 40 is provided with a chip breaking pad 42.
And 44, respectively, and these crushing pads are separated from a locating surface 46 on the top surface of the insert and are discontinuous. The chip crushing pad is separated from the cutting land introduction surface 30 while being close to the cutting land introduction surface 30.
It protrudes higher than the periphery of the cutting edge, but lower than the positioning surface 46. Turning to FIG. 4, the chip breaking pad
Behind the chip groove floor portion 32 has a flat chip breaking pads rising slope surface 48, and the rising slope surface 48
Intersects the top shaping surface of the chip breaking pad, ie, top surface 50. The top surface is almost flat. The chip breaking pad rising inclined surface 48 is preferably inclined at 35 degrees. Behind the top surface, the chip crushing pad descending slope 5
2, which intersects the flat channel 54. The flat channel has an inclined surface 34 on the positioning surface.
Crosses with

According to the present invention, a high cutting land is provided along the entire cutting edge to increase the shearing force,
The provision of a generally rounded chip groove increases chip friability, and also creates a central, high cutting land locating surface 46 and a chip created by a discontinuous chip crushing pad. Since the flow direction and the amount of friction of the chip in use are changed by the crushing pad descending inclined surface 52, the distortion induced by the chip is increased, and the channel around the high cutting land is increased. A cutting insert is provided that has easy access to coolant to reduce thermal impact on the insert through the portion 54 and the chip groove floor 32.

[0019]

According to the structure of the present invention, the friability of chips
And facilitates contact with the coolant to reduce thermal shock applied to the insert body during use.

Although the present invention has been described with reference to one embodiment, it will be understood by those skilled in the art that many modifications may be made within the scope of the invention without departing from the scope of the invention. .

[Brief description of the drawings]

FIG. 1 is a three-dimensional perspective view of an insert of the present invention.

FIG. 2 is a plan view of an insert.

FIG. 3 is a partial detailed cross-sectional view of the insert of FIG. 2 taken along line 3-3.

FIG. 4 is a partial detailed cross-sectional view of the insert of FIG. 2 along line 4-4.

[Explanation of symbols]

 12 Upper surface 14 Lower surface 16 Side wall 20, 22, 24, 26 Flank 21, 23, 25, 27 Corner 23, 27 Non-cut corner 28 Cutting edge 30 Cutting land introduction surface 32 Chip groove Floor 38, 40 Nose (Cutting portion) 42, 44 Chip crushing pad 46 Positioning surface 48 Chip crushing pad rising inclined surface 50 Top surface 52 Chip crushing pad descending inclined surface 54 Channel

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Thomas Bernadik, Tanglewood 782, Madison Heights, Michigan, USA 146008 (JP, A) Japanese Utility Model Hei 3-82103 (JP, U) Japanese Utility Model Sho 59-188104 (JP, U) Japanese Utility Model Utility Model 59-69802 (JP, U) (58) Field surveyed (Int. . ^6, DB name) B23B 27/00 - 27/24

Claims (6)

(57) [Claims] 1. An upper surface and a lower surface which are separated from and parallel to each other and are separated by flat side walls 16 which extend substantially intact between the two sides to form an insert body 18. , Each comprising a flank portion defined as a portion of a side wall extending from one corner of the insert 10 to an adjacent corner, intersecting the upper surface to form a cutting edge 28 extending along the entire circumference of the insert; At least two corners forming diagonally opposed nose portions 38, 40, or cuts, and further comprising a positive flat cutting land entry surface 30 descending from the cutting edge; A chip groove floor 32 rounded in a substantially concave state behind the land introduction surface 30; and the cutting land introduction surface on the upper surface. A substantially flat positioning surface 46 protruding above the perimeter of the insert; and chip breaking pads 42, 44 protruding higher than the perimeter and lower than the positioning surface 46 at the nose of the insert. A flat chip crusher 46 surrounds a central hole 56 passing through the upper surface and exiting from the lower surface, and extends along the flank from the chip groove floor 32 and intersects a flat seating surface 58. An inclined surface 34, wherein the chip breaking pad is discontinuous with the positioning surface;
The swarf groove floor portion 32 exist rearward from flat top surface 5
A polygonal indexable cutting insert having a rising slope 48 intersecting zero and being separated from said positioning surface 46 by a channel 54. 2. The rising slope adjacent to the chip groove floor 32 has a greater angle of incidence than the rising slope near the chip groove near a channel.
Insert according to 1. 3. The insert of claim 1, wherein said channel is flat. 4. Insert according to claim 1 that have a concave radius of the swarf groove floor portion 32 is about 0.02 inches (0.5 mm). 5. The insert according to claim 1, wherein the cutting land introduction surface 30 is inclined by about 14 degrees. 6. The insert according to claim 1, wherein the chip breaking inclined surface is inclined at about 35 degrees.