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A coated cutting tool

A cutting tool and coating technology, applied in manufacturing tools, tools for lathes, metal material coating processes, etc., can solve problems such as increased friction, inaccurate cutting process, and poor workpiece surface texture.

Pending Publication Date: 2022-02-01
SANDVIK COROMANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the cut progresses, the flank is subjected to workpiece motion, and excessive flank wear can result in poor surface texture, inaccurate cutting and increased friction

Method used

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  • A coated cutting tool
  • A coated cutting tool
  • A coated cutting tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Different Ti according to the present invention and not belonging to the present invention 0.33 al 0.67 N coatings were deposited on sintered carbide cutting tool insert blanks of geometry CNMG120804-MM. The composition of the cemented carbide was 10% by weight Co, 0.4% by weight Cr and the remainder WC. The cemented carbide blanks were coated by cathodic arc evaporation in a vacuum chamber containing four arcuate flanges. Ti-Al targets were installed in all flanges.

[0033] Uncoated blanks were mounted on pins that underwent triple rotation in the PVD chamber.

[0034] To make cubic Ti 0.33 al 0.67 N layer, evacuate the chamber to high vacuum (less than 10 -2Pa) and heated to about 450°C by a heater located inside the chamber. If the layer is to be deposited as a first layer on a substrate, the blank is then etched in Ar plasma for 60 minutes. Set the chamber pressure (reaction pressure) to 10 Pa of N 2 gas, and a unipolar DC bias voltage of -300 V (with resp...

Embodiment 2

[0061] Flank wear test:

[0062] longitudinal turning

[0063] Workpiece material: Uddeholm Sverker21 (tool steel), hardness ~ 210HB, D = 180, L = 700mm,

[0064] V c =125m / min

[0065] f n =0.072mm / turn

[0066] a p =2mm

[0067] No cutting fluid

[0068] The cut-off criterion for tool life is a flank wear VB of 0.15mm.

Embodiment 3

[0070] Crater wear test:

[0071] longitudinal turning

[0072] Workpiece material: Ovako 825B, ball bearing steel. After hot rolling and annealing, hardness ~ 200HB, D = 160, L = 700mm,

[0073] V c =160m / min

[0074] f n =0.3mm / turn

[0075] a p =2mm

[0076] use cutting fluid

[0077] The end of tool life standard is 0.8mm 2 The crescent area of ​​.

[0078] The test results according to Examples 2-3 are shown in Table 3 below.

[0079] table 3.

[0080]

[0081] It was concluded that the samples according to the invention (No. 3 and No. 4) had excellent flank wear resistance, while their crater wear resistance remained at about the same the same level.

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Abstract

The present invention relates to a coated cutting tool comprising a substrate (100) and a coating, wherein the coating comprises a (Ti,Al)N multilayer of alternating cubic Ti1-xAlxN sub-layers(101), 0.60<=x<=0.75, and cubic+hexagonal Ti1-yAlyN sub-layers (102), 0.60<=y<=0.75, the average cubic Ti1-xAlxN sub-layer thickness is from 75 to 450 nm and the average cubic+hexagonal Ti1-yAlyN sub-layer thickness is from 50 to 300 nm, the number each of cubic Ti1-xAlxN sub-layers and cubic+hexagonal Ti1-yAlyN sub- layers is from 2 to 50.

Description

[0001] The present invention relates to a coated cutting tool comprising multiple layers of cubic and hexagonal sublayers of (Ti,Al)N. Background technique [0002] (Ti,Al)N coatings produced by physical vapor deposition (PVD) are commonly used in the field of cutting tools for metal processing. [0003] The crystal structure of (Ti, Al)N in the PVD coating can be cubic (NaCl(=B1)) or hexagonal (wurtzite). In prior art studies, generally lower Al content (eg less than 60% of Al+Ti) in (Ti,Al)N provides a cubic structure, while high Al content (eg >70%) provides a hexagonal structure. Specific limits of Al content levels for providing single-phase cubic structures or mixed structures comprising both cubic and hexagonal structures have been reported and vary to some extent with eg deposition conditions. [0004] For example, Tanaka et al., "(Ti 1-x al x ) N coating properties (Properties of (Ti 1-x al x )N coatings for cutting tools prepared by the cathodic arc ion plati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/04C23C14/32C23C28/00C23C14/16C23C14/34C23C30/00
CPCC23C28/044C23C28/42C23C28/44C23C14/0641C23C14/325C23C14/024B23B27/14B23B2224/24C23C14/16
Inventor 拉尔斯·约翰逊马尔塔·萨赖瓦
Owner SANDVIK COROMANT