scholarly journals An Insight into TiN, TiAlN and AlTiN Hard Coatings for Cutting Tools

2020 ◽  
Vol 17 (2) ◽  
pp. 87-89
Author(s):  
Magdalena Valentina Lungu
Keyword(s):  
Quality Improvement ◽  
Surface Quality ◽  
Metal Cutting ◽  
Large Range ◽  
Cutting Tools ◽  
Hard Coatings ◽  
Metalworking Industry ◽  
Tool Surface ◽  
Insight Into ◽  
Coatings For Cutting Tools

The evolution of the metalworking industry over the centuries was greatly influenced by the development of a large range of cutting tools. Tool surface quality improvement with hard coatings generated considerable progress in the metal cutting industry. Hard coatings were composed mainly of nitrides, carbides, borides, and oxides of transition metals (typically Ti, Cr, Zr).1-5

scholarly journals Analysis of the Tribological Evolution of Nitride-Based Coatings

2021 ◽  
Author(s):  
Christian Ortiz Ortiz ◽  
Erick Hernandez-Rengifo ◽  
Julio Cesar Caicedo
Keyword(s):  
Critical Review ◽  
Protective Coatings ◽  
Cutting Tools ◽  
Hard Coatings ◽  
Machining Processes ◽  
Surface Control ◽  
Metalworking Industry ◽  
Recent Developments

This chapter describes the fundamental and technological role of nitride-based hard coatings as protective coatings in some applications within the metalworking industry. For this, this chapter will present a critical review of previous research and recent developments on nitride-based coatings in different systems such as (multilayers, quaternaries, among others), where it will be possible to demonstrate their main properties and advantages that they can grant when they are implemented on conventional steels, such as greater hardness, surface control, electrochemical resistance, resistance against wear, among others. These results will determine that this type of coatings are suitable candidates to be implemented as protective coatings on cutting tools, which suffer from high wear in machining processes in the metalworking industry.

Evaluation of Residual Stresses in PVD Coatings by Means of the Curvature Method of Plate

2016 ◽  
Vol 721 ◽  
pp. 404-408 ◽  
Author(s):  
Harri Lille ◽  
Alexander Ryabchikov ◽  
Eron Adoberg ◽  
Liisa Kurissoo ◽  
Priidu Peetsalu ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Physical Vapor Deposition ◽  
Metal Cutting ◽  
Cutting Tools ◽  
Layer Growth ◽  
Hard Coatings ◽  
Steel Plates ◽  
Nickel Steel ◽  
Pvd Coatings ◽  
Mechanical And Tribological Properties

Physical Vapor Deposition (PVD) coatings are primarily designed for metal cutting tools operating in extreme machining and blanking conditions. Residual stresses arising during coating deposition exert an important effect on the service life of the coating through influencing mechanical and tribological properties and adhesion. To determine macroscopic residual stresses, the conventional curvature method was used. As an application, residual stresses in four aluminum based PVD hard coatings, i.e. AlTiN, AlTiSiN, AlCrN, and AlCrSiN, were investigated in the presence of the Ti adhesion layer. Nickel steel plates and steel plates were used as the substrate. Residual stresses were compressive and high (3.0-7.5 GPa) in all coatings. Compressive stresses in coatings are desirable in cohesive tool damage as they strengthen the coating. The values of residual stresses were not significantly dependent on the angle of plate placement (parallel (0°), inclined (45°) and perpendicular (90°)) in relation to the PVD cathode in the deposition chamber. The magnitude of residual stresses is influenced by intrinsic strain at layer growth rather than by thermal stress.

scholarly journals Tailored Chip Breaker Development for Polycrystalline Diamond Inserts: FEM-based Design and Validation

2019 ◽  
Vol 9 (19) ◽  
pp. 4117 ◽  
Author(s):  
Cascón ◽  
Sarasua ◽  
Elkaseer
Keyword(s):  
Surface Quality ◽  
Metal Cutting ◽  
High Surface ◽  
Cutting Tools ◽  
Polycrystalline Diamond ◽  
Critical Issue ◽  
Superior Performance ◽  
Machined Surface ◽  
Chip Breaker ◽  
High Surface Quality

Chip evacuation is a critical issue in metal cutting, especially continuous chips that are generated during the machining of ductile materials. The improper evacuation of these kinds of chips can cause scratching of the machined surface of the workpiece and worsen the resultant surface quality. This scenario can be avoided by using a properly designed chip breaker. Despite their relevance, chip breakers are not in wide-spread use in polycrystalline diamond (PCD) cutting tools. This paper presents a systematic methodology to design chip breakers for PCD turning inserts through finite element modelling. The goal is to evacuate the formed chips from the cutting zone controllably and thus, maintain surface quality. Particularly, different scenarios of the chip formation process and chip curling/evacuation were simulated for different tool designs. Then, the chip breaker was produced by laser ablation. Finally, experimental validation tests were conducted to confirm the ability of this chip breaker to evacuate the chips effectively. The machining results revealed superior performance of the insert with chip breaker in terms of the ability to produce curly chips and high surface quality (Ra = 0.51–0.56 µm) when compared with the insert without chip breaker that produced continuous chips and higher surface roughness (Ra = 0.74–1.61 µm).

Concrete Surface Quality Improvement Technique Using Highly Water Repellent Sealing Method

2016 ◽  
Vol 54 (11) ◽  
pp. 1105-1110
Author(s):  
K. Watanabe ◽  
G. Sakai ◽  
N. Sakata ◽  
T. Ishida
Keyword(s):  
Quality Improvement ◽  
Surface Quality ◽  
Concrete Surface ◽  
Water Repellent
Sign in / Sign up

Export Citation Format

Share Document