Source: https://patents.google.com/patent/US7153562?oq=7%2C172%2C682
Timestamp: 2018-02-21 16:20:29
Document Index: 608418059

Matched Legal Cases: ['§ 119', 'Application No. 0300175', 'art) 4', 'art) 12', 'art) 24', 'art) 2', 'art) 14', 'art) 13', 'art) 19', 'art\n1']

US7153562B2 - Coated cemented carbide insert - Google Patents
Coated cemented carbide insert
US7153562B2
US7153562B2 US10760387 US76038704A US7153562B2 US 7153562 B2 US7153562 B2 US 7153562B2 US 10760387 US10760387 US 10760387 US 76038704 A US76038704 A US 76038704A US 7153562 B2 US7153562 B2 US 7153562B2
US10760387
US20040180241A1 (en )
Mikael Lagerquist
B23B2200/245—Cross section of the cutting edge rounded
The present invention relates to a cutting tool insert particularly for turning of steel comprising a cemented carbide body, a coating with a post treatment with
a first, innermost layer system of one or several layers of TiCxNyOz with x+y+z≦1 with a total thickness of 0.7–4.5 μm
a second multilayer system consisting of a totally 5–31 alternating Al2O3 and TiCxNyOz (x+y+z≦1), preferably κ-Al2O3 and TiN, the Al2O3-layers having an individual layer thickness of <0.5 μm and the TiCxNyOz-layers 0.01–0.2 μm with a total thickness of the multilayer of 1.0–4.0 μm. The multilayer is exposed along the edge line and into the rake and flank face, at least 0.02 mm, from the edge line on the rake face, preferably the contact length of the chip at most 0.9 mm, and 0.02–0.20 mm on the flank face.
This application claims priority under 35 U.S.C. § 119 to Swedish Application No. 0300175-7 filed in Sweden on Jan. 24, 2003; the entire contents of which is hereby incorporated by reference.
The present invention relates to a coated cemented carbide cutting tool insert for the machining in general of steel in applications having high requirements on wear resistance and toughness behaviour of the cutting edge. The tool is particularly suitable for the turning of stainless steels.
Multilayer coatings comprising first and second coating layers of different materials which are alternately laminated on the substrate, each of the first coating layers having a first thickness and each of the second coating layers having a second thickness are known. The two layers should preferably have a different crystal structure and/or at least different lattice spacings. One example of such a structure is when the Al2O3 growth periodically is interrupted by a short TiN deposition process resulting in a (Al2O3+TiN)x multilayer structure see e.g. Proceedings of the 12th European CVD Conference page pr.8–349. GB 2048960A discloses a multilayer coating with a multiplicity of alternating layers of 0.02 to 0.1 μm consisting of hard material of different compositions. U.S. Pat. No. 4,599,281 discloses a multilayer coating with alternating layers of an aluminium-boron mixed oxide and another oxide layer of e g Ti(C,N,O). Dreyer and Kolaska, Metals Society (Book 278), London, England (1982) 112–117 report an A—O—N multilayer. In U.S. Pat. No. 4,984,940 Bryant et al. disclose a cutting insert composed of a cemented carbide substrate with 6.1–6.5 wt % cobalt, a coating including a base layer of titaniumcarbonitride followed by a multilayered coating consisting of a plurality of alumina layers. A cemented carbide substrate with a coating comprising 6–8 alumina layers is also claimed in U.S. Pat. No. 5,700,569. WO 99/58738 describes a tool consisting of a hard wear resistant substrate and a CVD multilayer of about 50 layers. EP-A-1103635 claims a cutting tool consisting of a cemented carbide substrate with 9.0–10.9 wt % cobalt and a coating comprising a medium temperature CVD (MTCVD) deposited TiCN-layer and a multilayer composed of totally 7–41 layers of α-alumina and TiN or Ti(C,N). EP-A-1245698, EP-A-1245700, and EP-1209255 also relate to multilayer coatings.
It is an object of the present invention to provide a cutting tool insert able to simultaneously withstand all the above mentioned wear modes.
FIG. 1. is a scanning electron micrograph (SEM) of a cross-section of the coating according to the present invention in which:
More specifically, the invention relates to a WC+Co-based cemented carbide substrate with additions of cubic carbides, a specific grain size range of the WC grains, a specific composition range of WC+Co and a coating on the cemented carbide substrate including an innermost thin layer of equiaxed TiCxNyOz followed by a layer of columnar TiCxNyOz, a thin layer of equiaxed TiCxNyOz, a multilayer with a periodic variation of TiCxNyOz and Al2O3 layers (x+y+z≦1) and an outermost layer of TiCxNy (x+y≦1). At least the non-oxide outermost layer in areas in direct contact with material from the work-piece around the cutting edge is missing.
a first, innermost layer (A) of TiCxNyOz with x+y+z≦1, preferably y>x and z<0.2, most preferably y>0.8 and z=0, with equiaxed grains with size <0.5 μm and a total thickness <1.5 μm but >0.1 μm preferably from about 0.1 to about 0.6 μm.
a second layer (B) of TiCxNyOz with x+y+z≦1, preferably with z=0, x>0.3 and y>0.3, most preferably x>0.5, with a thickness of from about 0.4 to about 3.9 μm, preferably from about 1.5 to about 3.0 μm with columnar grains.
a third layer (C) of TiCxNyOz with x+y+z≦1, preferably y>x and z<0.2, most preferably y>0.8 and z=0, with equiaxed grains with size <0.5 μm and a total thickness <1.5 μm but >0.1 μm, preferably from about 0.2 to about 0.8 μm in a first embodiment. This layer (C) can be omitted in a second embodiment.
the total thickness of the layers A+B+C is from about 0.7 to about 4.5 μm, preferably from about 1.2 to about 4.0 μm. Preferably, the layers A and C are each thinner than the layer B.
a multilayer (D) consisting of a plurality of alternating Al2O3 and TiCxNyOz (x+y+z≦1) layers, preferably κ-Al2O3 and TiN layers. The innermost and the outermost layer of the multilayer sequence are Al2O3-layers. The total number of layers, including both the TiCxNyOz- and Al2O3-layers, is between about 5 and about 31, preferably about 11 and about 15 layers. The Al2O3-layers have an individual layer thickness of <0.5 μm, preferably from about 0.2 to about 0.5 μm. The TiCxNyOz-layers have an individual layer thickness of from about 0.01 to about 0.2 μm, preferably from about 0.02 to about 0.15 μm. The total thickness of the multilayer is from about 1.0 to about 4.0 μm, preferably from about 1.5 to about 3.5 μm. The grain size of the Al2O3-layer is equal to or less than the thickness of the Al2O3-layer.
an outermost layer system (E) consisting of one or several layers in sequence of TiCxNy (x+y≦1) or combinations thereof, preferably three layers in sequence of TiN, TiC, and TiN. The total thickness is <2.0 μm but >0.1 μm, preferably from about 0.2 to about 1.0 μm.
the total thickness of the layers A–E is from about 2.0 to about 8.0 μm, preferably from about 4.0 to about 7.0 μm.
The outermost part of the coating is missing around the edge such that this area corresponds to the chip contact on the rake side and the contact with the work piece on the flank side. Most preferably this uncoated area correspond to the primary land on the rake side when a primary land exists on the geometry at hand such that the coating is missing a distance from a point defined in FIG. 2B with a perspective perpendicular to the insert face planes on the rake face “a” and on the flank face “b”. These distances depend on different insert geometries and insert sizes, etc., but on the rake face, preferably correspond to 0.03<a<0.9 mm and 0.02<b<0.2 mm, independent of the existence of a primary land or not. In any case, a>b, preferably a>1.5b. In one embodiment, the layer E is missing. In another embodiment, both layers D and E are missing in those parts of the area.
a first (innermost) layer(A) of TiCxNyOz with x+y+z≦1, preferably y>x and z<0.2, most preferably y>0.8 and z=0, with equiaxed grains with size <0.5 μm and a total thickness <1.5 μm but >0.1 μm using known chemical vapor deposition, CVD, methods.
a layer of TiCxNyOz(B) with x+y+z≦1, preferably with z=0, x>0.3 and y>0.3 with a thickness of from about 0.4 to about 3.9 μm, preferably from about 1.5 to about 3.0 μm with columnar grains, using preferably a moderate temperature CVD, MTCVD, technique (using acetonitrile as the carbon and nitrogen source for forming the layer in the temperature range of from about 700 to about 900° C.). The exact conditions depend to a certain extent on the design of the equipment used but are within the purview of the skilled artisan.
a layer of TiCxNyOz(C) with x+y+z≦1, preferably y>x and z<0.2, most preferably y>0.8 and z=0, with equiaxed grains with size <0.5 μm and a total thickness <1.5 μm but >0.1 μm using known CVD-methods. This layer (C) can be omitted in another embodiment.
The total thickness of the layers A+B+C is from about 0.7 to about 4.5 μm, preferably from about 1.2 to about 4.0 μm. Preferably, the layers A and C are each thinner than layer B.
a multilayer(D) consisting of a plurality of alternating Al2O3 and TiCxNyOz (x+y+z≦1l) layers, preferably κ-Al2O3— and TiN-layers, using known CVD-methods. The innermost and the outermost layer of the multilayer sequence are Al2O3-layers. The total number of layers, including both the TiCxNyOz— and Al2O3-layers, is between about 5 and about 31, preferably about 11 and about 15 layers. The Al2O3-layers have an individual layer thickness of <0.5 μm, preferably from about 0.2 to about 0.5 μm. The TiCxNyOz-layers have an individual layer thickness of from about 0.01 to about 0.2 μm, preferably from about 0.02 to about 0.15 μm. The total thickness of the multilayer is from about 1.0 to about 4.0 μm, preferably from about 1.5 to about 3.5 μm. The grain size of the Al2O3-layer is equal to or less than the thickness of the Al2O3-layer.
preferably, an outermost layer system(E) consisting of one or several layers in sequence of TiCxNy (x+y≦1) or combinations thereof using known CVD-methods. The total thickness is <1.5 μm.
G. the total thickness of layers A–E is from about 2.0 to about 8.0 μm.
The following inserts and examples are selected to exemplify the advantages with the invention. These examples are summarised in Table 1.
Inserts from A and B were tested in a turning operation.
Operation: Axial and facial turning in a bar
Work piece material: Austenitic stainless steel AISI 316L
Cutting Speed: 225 m/min
Insert style: CNMG120408-MM
Insert A: (invention) ca 10
Insert B: (prior art) ca 6
Operation: Intermittent cutting of an assembly part
Work piece material: Austenitic stainless steel, AISI316L
Feed rate: 0.2–0.3 mm/rev
Depth of cut: 0.5–1.5 mm
Insert style: SNMG120412-MR
Insert A: (invention) 8.2
Insert B: (prior art) 4.2
Operation: Continuous cutting in a cast ring
Depth of cut: 3.5 mm
Insert style: CNMG120412-MR
Insert A: (invention) 18.6
Insert B: (prior art) 12.4
Operation: Continuous cutting of a housing
Work piece material: Duplex stainless steel, SS2377
Depth of cut: 1.35 mm
Insert style: WNMG080412-MR
Insert A: (invention) 46
Insert B: (prior art) 24
Operation: Intermittent cutting of a cast
Work piece material: Austenitic stainless steel, AISI316
Cutting speed: 150–200 m/min
Feed rate: 0.1–0.15 mm/rev
Insert style: CNMG120412-PR
Results: Tool life (items)
Insert A: (invention) 7
Insert B: (prior art) 2
Example 6 Illustrative
Inserts from C and D were tested in a turning operation.
Operation: Facing of a bar
Work piece material: Austenitic stainless steel, AISI304L
Depth of cut: maximum 4 mm
Results: Wear pattern
Insert C: (reference) Limited flaking on rake (FIG. 4)
Insert D: (reference) Widespread flaking on rake (FIG. 5)
Example 7 Illustrative
Inserts from C and E were tested in a turning operation.
Operation: Combined facing and longitudinal turning
Work piece material: Austenitic stainless steel, AISI316Ti
Cutting speed: 100–120 m/min
Results: Total damaged edge outside cut
Insert C: (reference) 11.5 mm
Insert E: (prior art) 14.7 mm
Example 8 Illustrative
Insert C: (reference) 18
Insert E: (prior art) 13
Inserts from F and G were tested in a turning operation.
Operation: Continuous cutting in a forged component
Insert style: CNMG120416-MM
Results: Tool life (pcs)
Insert F: (invention) 32
Insert G: (prior art) 19
A (invention) B (prior art) C (outside invention) D (outside invention) E (prior art) F (invention) G (prior art)
Co/Ta/Nb (wt %) 8.75/1.17/0.29 10.5/1.16/0.28 9.15/1.17/0.29 9.15/1.17/0.29 9.15/1.17/0.29 7.5/2.72/0.44 7.5/2.72/0.44
Ti/N (wt %) —/— —/— —/— —/— —/— 1.83/0.09 1.83/0.09
TiN (innermost layer) 0.5 μm 0.5 μm 0.5 μm 0.5 μm 0.5 μm 0.5 μm 0.5 μm
Ti (C,N) 2.2 μm 4.0 μm 2.2 μm 2.3 μm 2.2 μm 2.2 μm 7.5 μm
TiN 0.5 μm — — — — 0.5 μm —
(Al2O3/TiN)xAl2O3 1.0 μm 1.8 μm, x = 5 1.9 μm, x = 3 1.5 μm 2.2 μm, x = 6 1.2 μm
solid Al2O3 solid Al2O3 solid Al2O3
TiN + TiC + TiN 0.5 μm 0.5 μm 0.5 μm 0.5 μm 0.5 μm 0.5 μm 0.5 μm
Post treatment Acc to Prior art Prior art Prior art Prior art Acc to Prior art
1. plastic deformation 10 min 6 min
2. combined wear 8.2 min 4.2 min
3. toughness and wear 18.6 min 12.4 min
4. toughness and 46 min 24 min
5. toughness 7 items 2 items
6. flaking Limited Widespread
7. edge toughness 11.5 mm 14.7 mm
8. plastic deformation 18 min 13 min
9. flank wear and 32 items 19 items
US10760387 2003-01-24 2004-01-21 Coated cemented carbide insert Active 2024-06-26 US7153562B2 (en)
SE0300175 2003-01-24
SE0300175-7 2003-01-24
US20040180241A1 true US20040180241A1 (en) 2004-09-16
US7153562B2 true US7153562B2 (en) 2006-12-26
ID=20290203
US10760387 Active 2024-06-26 US7153562B2 (en) 2003-01-24 2004-01-21 Coated cemented carbide insert
US (1) US7153562B2 (en)
JP (1) JP5529771B2 (en)
KR (1) KR20040068476A (en)
CN (1) CN100478498C (en)
EP (1) EP1455003B1 (en)
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:RODMAR, MARKUS;LINDHOLM, MIKEAL;JONSSON, ANDERS;AND OTHERS;REEL/FRAME:015342/0958;SIGNING DATES FROM 20040108 TO 20040114