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Coated cutting tool

一种切削工具、涂层的技术，应用在涂层、金属材料涂层工艺、制造工具等方向，能够解决脱层、涂层脱层等问题

Inactive Publication Date: 2014-08-27
LAMINA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to too heavy ion bombardment, defects may be generated, and too high compressive stress will eventually delaminate the coating (especially thick coating) spontaneously or due to the forces acting on the coating during machining

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] A (Ti,Al)N coating was deposited on a S1 substrate in a nitrogen atmosphere using five planar targets, each containing 40 atomic % Ti and 60 atomic % Al.

[0075] Before loading the substrate into the deposition system, the substrate is cleaned by dry blasting for honing to obtain a cutting edge radius of 30-60 μm, followed by wet blasting to remove residues from the dry blasting step. The dry spraying is carried out at a pressure of about 0.4 MPa to 0.6 MPa using a nozzle having a diameter of 10 mm and 100 mesh alumina particles, the nozzle being arranged at a distance of about 150 mm and an angle of about 45° with respect to the rake face of the substrate, i.e., The particles impinge on the rake face of the substrate at an angle of 45°. Wet blasting was performed using a 9.5 mm diameter nozzle and 360 mesh alumina particles at a pressure of about 0.4 MPa, the nozzle being positioned at a distance of about 150 mm and at an angle of about 45° relative to the substrate r...

Embodiment 2

[0081] A (Ti,Al)N coating was deposited on an S2 substrate in a nitrogen atmosphere using five planar targets, each containing 40 atomic % Ti and 60 atomic % Al.

[0082] Before deposition, the substrate was pretreated in the manner of Example 1, placed horizontally and subjected to plasma etching. The coating was deposited using the following deposition conditions: temperature 450°C, nitrogen pressure 5Pa, arc current 400A, bias voltage 35.5V (DC), cathode voltage 17.5V. After deposition, the coating was post-treated in the manner of Example 1.

[0083] The thickness of the coating was 14 μm on the flank and 8 μm on the rake. The hardness is 31GPa. The internal stress after wet spray coating is -1950MPa. The area surface roughness of the coated cutting tools was measured on the rake face using a white light interferometer (Wyko NT9100, Veeco Instruments Ltd). Analysis was performed using a Gaussian bandpass filter rejecting wavelengths greater than 0.08 mm. The arithmeti...

Embodiment 3

[0086] A (Ti,Al)N coating was deposited on a S1 substrate in a nitrogen atmosphere using a flat plate-like target containing 40 atomic % Ti and 60 atomic % Al.

[0087] Before deposition, the substrate was positioned vertically, ie with the rake face facing the flat target, and then pretreated and plasma etched in the same manner as in Example 1. The coating was deposited using the following deposition conditions: temperature 450°C, nitrogen pressure 2.5Pa, arc current 400A, bias voltage 19V (DC), cathode voltage 17.5V. After deposition, the coating was wet-sprayed for about 0.5 minutes at a pressure of about 0.4 MPa using a nozzle with a diameter of 12.5 mm at a distance of about 50 mm from the rake face of the substrate and about 500 mesh alumina particles. 45° angle setting.

[0088] The thickness of the coating was 21 μm on the flank and 24 μm on the rake. The hardness is 27GPa. The internal stress after wet spraying of the coating was +90MPa.

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Abstract

The present invention provides a coated cutting tool comprising a substrate and a coating, where the coating comprises at least one compound layer deposited by cathodic arc deposition, which has a thickness of 10-30 [mu]m characterized in that the coating has internal stress ranges from low tensile stresses, lower than 0.2GPa, to compressive stresses, lower than 3GPa.

Description

technical field [0001] The present invention relates to a coated cutting tool comprising a substrate and a thicker PVD coating. Background technique [0002] Most cutting tools used for turning, milling, drilling, or other machining operations that form chips are today coated with wear-resistant coatings deposited using chemical vapor deposition (CVD) or physical vapor deposition (PVD) techniques, thereby enabling Extend the life of the tool and / or increase productivity. Typically, thicker coatings are used for increased wear resistance. For CVD coatings this is easy to achieve. However, PVD coatings have several attractive properties compared to CVD coatings, notably the ability to provide compressive stress in the coating, which results in increased toughness compared to CVD coatings. This compressive stress basically originates from the difference in thermal expansion between the substrate and the coating as well as the densification effect brought about by the bombard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/32C23C14/06C23C14/58
CPCC23C14/325Y10T407/27C23C14/5886C23C14/0641B23B2228/105B23B2224/24B23B27/148H01J37/32055
Inventor J·布尔马克H·库廷斯A·根瓦德
Owner LAMINA TECH
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