JPS60150902A - Cutting insert - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to cutting tools for machining chip-forming materials. More particularly, the present invention relates to cutting inserts that incorporate chip control geometries that are particularly advantageous for intermediate range feed rates transitioning between very low or finishing feed rates and relatively high feed rates. .

/'? U.S. Patent Application Ser. teaches the chip control geometry of. t q t 2t
U.S. Patent Application Ser. Although many of these prior art concepts have been successful for their intended operating conditions, I have developed an improved tip controller suitable for use over a relatively wide intermediate range of feed rates. discovered. This chip control device is /-)
The cutting inserts of the present invention can be used in many applications that would traditionally require switching from one design to another when the design exceeds the feed rate range encountered for many applications. Make it seem possible.

Examples of prior art disclosing multi-chip control grooves that are superficially similar to the present invention include:

The invention is embodied in a preferred form as a fully indexable polygonal cutting insert for machining chip-forming materials. Both tip engaging surfaces of the insert include a modified first cylindrical tip control groove of uniform width that intersects and extends parallel to the arcuate cutting edge on each side of the polygon. A chip controller is provided. A first tip control groove connects each first control groove and has a cross section of greater radius but less depth with respect to the front plane of the insert than the first tip control groove. The first control groove has a maximum width approximately halfway between adjacent cutting corners of the polygon and gradually decreases to zero width near each corner within the area of the bisector of each cutting corner angle. are doing.

Each arcuate cutting edge along a side of the polygon has a lowest point with respect to the associated insert tip retaining surface approximately midway between the abutting cutting edges. Thus, each cutting edge provides a positive front-to-back rake angle, but can be mounted in a tool holder with a negative rake angle.

As a result, an island is left in the tip-engaging surface inside the first control groove, an insert having tip control grooves in both major faces of the polygon, i.e., an insert that is fully indexable on both sides. Provide appropriate mounting support for the

Objects and features of the invention will become apparent from the following detailed description of preferred embodiments of the invention, taken in conjunction with the accompanying drawings.

This will be explained with reference to FIGS. The triangular indexable cutting insert 100 has upper and lower substantially parallel chip-engaging or rake surfaces, and the upper surface 106 has an arcuate cutting edge extending between cutting corners A and B. 108A and
An arcuate cutting blade 108B extending between cutting corners B and C, and corner C1! : Bounded by an arcuate cutting edge 108C extending between A. As seen in FIG. 2, each arcuate cutting edge, such as 108A, has a lowest point with respect to its associated chip engaging surface approximately midway between its associated cutting edges A and B. Near corners A and B, the cutting blade 108
A extends for a relatively short distance 114 that is generally parallel to but slightly below the plane of the top tip engaging surface 106 and then blends smoothly into a relatively large arc having a radius RC. . Cutting blade 108A, 108B, 1
The side profile of 08C produces a positive longitudinal rake angle for the cutting blade 108, as shown in FIG. insert body 10
0 side 113 is substantially perpendicular to the top and bottom chip engaging surfaces. Therefore, in a preferred form, 2. Insert 100 is a so-called "positive and negative" insert. That is, the insert has a cutting blade with a positive front-to-back rake angle on an edible die insert that can be mounted in a negative rake angle tool holding pocket.

1st cylindrical tip control 610.9A, 109B and 109
0 intersects each arcuate cut and extends parallel to the cutting edge, each groove having a uniform width 120. Groove 109
A and 109B are merged together at corner BIC, and groove 1
09B and 109C smoothly merge at the edge -0, and grooves 109C and 109A smoothly merge at the edge A.

The second cylindrical control grooves 111A, IIIB, and IIIC are adjacent to the seventh grooves 109A, 109B, and 109C, respectively. The second groove 111A intersects the first groove 109A along a substantially straight boundary line 110A, and the innermost boundary line of the second groove 111A is between A and B when the first groove 111 is cut. It has an arcuate shape with the widest point 115 in the middle of #1.

Similarly, the cylindrical groove 111B has a substantially straight boundary line 1
10B, intersects the first groove 109B and has its widest point approximately midway between cutting edges B and C, while the cylindrical groove 11
1C intersects the first groove 109C along a substantially straight boundary line 110C and has its widest point approximately midway between cutting corners C and A.

Unlike the first control grooves 109A, 109B, and 109C, the third control grooves 111A, IIIB, and 1110 do not merge with each other, and each of the first control grooves corresponds to each cutting corner A.

The width becomes zero in the area of the bisector of the angle formed by B and C.

The innermost arcuate borders of the third control grooves 111A, IIIB, and IC form an island having a surface 106 that is substantially in the plane of the top tip-retaining surface of the insert. The island surface 106 has progressively narrower protrusions, with protrusions 106A terminating at a point 112 approximately on the equisector of the angle formed by corner A, and protrusions 106B ,
The protrusion 106C ends at a point 112B, which is approximately on the bisector of the angle formed by the corner B, and the protrusion 106C ends at a point 112C, which is approximately the bisector of the angle formed by the corner C. ing. It should be appreciated that in the preferred form, the tip control structures described above are provided on both major tip-engaging surfaces of the insert 100. Island-shaped part 10
6 and related protrusions 106A, 10611, 106
In C, suitable mounting support surfaces are provided on each major surface, thereby providing six indexable cutting edges on opposite fully indexable triangular inserts. Generally, the polygonal insert of the present invention has n indexable cutting edges. Here n is the number of polygon sides used.

Cylindrical through hole 102 with countersunk portions 104A and 104B
is located in the center of the inscribed circle IC of the insert 100 and receives an appropriately shaped insert mounting screw of the tool holder. Alternatively, the insert 100 is used in a top clamp type tool holder. It can be shaped like a shell.

As can be seen from FIG. 3, each first groove, such as groove 111B, has a cross-sectional radius R2 that is υ larger than the cross-sectional radius R1 of the adjacent first groove. Depth R below the surface 106 of the groove 111B
2 is smaller than the depth Hl of the groove 109B. Cylindrical surface 1
The axes 09B and 111B, designated C1 and 02, respectively, are inside the cutting blade 108B and extend substantially parallel to the vertical plane containing the cutting blade.

The axis C2 is closer to the center of the inscribed circle of the insert than the axis CI, as shown in FIG. ing. It is clear that D2 is greater than Dl.

In the above-described chip control structure, the prototyping insert has a prototyping insert ranging from about O0θθ5 inches/rev. to about o,o3θ inches/rev.
It has been successfully used in metal cutting applications at feed rates in the range of 1/revolution. In the lower part of this feed rate range, the first or outer control groove acts as a chip guiding surface, while the associated inner or first control groove acts primarily as a relief gap area and This allows a relatively smooth, unrestricted flow of chips with reduced frictional resistance. At the higher end of the useful feed rate range, the first control groove also functions as a chip guiding surface.

One example of a successfully tested and identified protozoic triangular insert has an inscribed circle with a nominal diameter of 0.3 inches (/Ω·7−) and a The insert has a thickness of 0.117 inches (+, 7 left); 2.
It has a cutting edge radius RC of 0 inches (!; 0-g rm ). Each cutting corner ASB, C is 0-03/inch (0
, 79 m). each first
That is, the nominally uniform width 120 of the outer control groove is 0.0'.
1 inch (1,0Al, g tan ), while each inner first groove has a maximum width 115 of 3 inches (/, g3Q, 2 mm ) at its midpoint. . A typical value for dimension 1140 in Figure 2 at each cutting edge is 0.700 inches (2.!;'I Wa), while for dimension ) II (Figure 3) , 79 lie), R2 (Figure 3) O20:1.5 for K
Inch (0,435m), RI (f4.7 figure, Hong figure)
0.06 inch (/, 32'l trs), R
05135 inches (3,9
37), 0.0/3 inch (0
, 3g/m), and 0.0 for D2 (Fig.
Typical values of 3 (0,71,2 m) have been successfully used.

It should be noted that the invention described above has been illustrated with respect to particular embodiments. The many details used to facilitate the description of this particular embodiment are chosen for convenience rather than as limitations on the scope of the invention, which is defined by the scope and spirit of the claims. It is understood that it is intended to be measured.

[Brief explanation of drawings]

FIG. 1 is a top plan view of an insert designed in accordance with the principles of the present invention. 2 is a side view of the insert of FIG. 1; FIG. FIG. 5 is a sectional view taken along the line ■-■ in FIG. 1 in the direction of the arrow. FIG. 1 is a sectional view taken along line IV-IV in FIG. 1 in the direction of the arrow. 108A, 108B, 108C...... Arcuate cutting blade A, B, C... Cutting edge 100
......Cutting insert 106...
・Chip engagement surface, island portions 106A, 106B, 106
C+・・・・・・Protrusion 113 ・・・・・・・・・
Side surfaces 109A, 109B, 109C... 1st
Cylindrical control (7th cylindrical chip control groove) 111A, IIIB, llIC 2nd
Cylindrical control (second cylindrical chip control groove) 110A, 110B, 110C......Boundary line 171 ('(';,"l (no change to own line)
・l ”Ft'g-3 2. Title of the invention Cutting Insertion body 3.?Relationship with the heavy burden person case Applicant 4. Agent

Claims (1)

Claims: 1. A chip-generating material cutting tool having a chip-engaging surface and a plurality of identical side surfaces intersecting the chip-engaging surface at a plurality of six cutting edges. an arcuate cutting edge extending between a pair of cutting edges and having a lowest point with respect to the plane of the chip engaging surface substantially midway between the pair of cutting edges; a substance intersecting the cutting edges and extending parallel to the cutting edges; a first cylindrical control surface of uniform width; a second cylindrical control surface that merges and adjoins the inner border of the third control surface at the outer border of the first cylindrical control surface; One control surface has a cross-sectional radius greater than the cross-sectional radius of the seventh control surface, a depth less than the depth of the first control surface, and a maximum width at approximately the midpoint between the pair of cutting corners. a first cylindrical control surface having a width varying to zero width in the region of the bisector of an angle; and a tool for cutting chip-producing material. 2. A flat island surface in the plane of the tip-engaging surface having a progressively narrowing protrusion extending toward each cutting corner and terminating at each corner at the inner border of the first control surface. The cutting tool according to claim 1, further comprising: 3. a polygonal body having opposing top and bottom chip-engaging surfaces in substantially parallel planes, and a polygonal peripheral surface defined by side surfaces substantially perpendicular to said parallel planes; , wherein at least one of the top and bottom chip-engaging surfaces is intersected by a polygonal cutting corner; between adjacent pairs of cutting corners; an extending arcuate cutting edge, each cutting edge having a lowest point with respect to its associated chip retaining surface approximately midway between the pair of cutting edges; a first cylindrical control surface of substantially uniform width extending parallel to the cutting edge and merging with each other at each cutting corner;
merging with an inner boundary of each first control surface at its outer boundary and extending adjacent to the inner boundary, the first control surface having a cross-sectional radius greater than the cross-sectional radius of the first control surface;
a first cylinder having a depth less than the depth of the first control surface and a width varying from a maximum width at approximately the midpoint between a pair of cutting corners to a zero width in the region of the bisector of each corner angle; an indexable cutting insert including a shape control surface; 4. further comprising a flat island surface bounded by the inner boundary of the first control surface and disposed in the plane of the tip engaging surface, said island surface extending toward each cutting corner; and having a progressively narrowing projection terminating at each throat at the inner boundary of the pair of merging first control surfaces, thereby forming a seating support surface for the cutting insert. A cutting insert according to range 3.