Wear Resistance Of Carbide Tools Research Articles

Influence of Mo content on the properties of multilayer nanostructured coatings based on the (Mo,Cr,Al)N system.

The study is focused on the comparison of two coatings with the identical thickness, structure, and the content of aluminum (Al) (10 at %), but different ratios of chromium (Cr) and molybdenum (Mo) content in the wear-resistant layer of (Mo,Cr,Al)N: Cr/Mo – 70/20 and 45/45 at%. The tribological properties of the coatings within a range of the temperatures of 500–900 °C and the wear resistance of carbide tools with the coatings under study during the turning of 1045 steel were considered. The study was also focused on the wear patterns on the coatings and diffusion and oxidation processes during the cutting. While there is a rather active formation of an aluminum oxide layer on the free surface of the coating, this layer is not able to have any noticeable effect on the cutting conditions, since it is not directly involved in the cutting process. The contact pads of the tool bear no such layer or extremely small amount of this layer (at an adherent boundary). At the same time, the presence of chromium and molybdenum oxides are detected in the contact areas, and therefore, these oxides can affect the cutting process. The coating with the Mo content of 45 at% ensured both the minimum of the adhesion component of the coefficient of friction (COF) during the tribological tests at high temperatures (800 °C and higher) and the maximum wear resistance during the turning of steel.

Effect of multilayer coatings based on zirconium and titanium on wear resistance of carbide tools during turning of stainless steel

In this article, the influence of coatings of the type (Ti—Zr)N—TiN, TiN—ZrN and ZrN—(Ti—Zr)N—TiN obtained by physical vapor deposition on the wear resistance of T15K6 cemented carbides plates during longitudinal turning blanks from stainless steel 12X18H10T is considered. It has been experimentally established that the presence and composition of the coating on the working surfaces of the tool in all cases contributes to a significant decrease in the wear rate of cemented carbides inserts. According to the research results, the composition ZrN—(Ti—Zr)N—TiN should be considered the best option. During the cutting process, for a tool with this type of coating, the minimum wear along the flank surface and the length of chip contact with the rake surface, as well as the smallest values of the shear angle in the zone of primary plastic deformations, were recorded.

Effect of texture parameters on cutting performance of flank-faced textured carbide tools in dry cutting of green Al2O3 ceramics

Tool wear and surface quality are the most important problems in green ceramic processing. This paper fabricated textures with different texture parameters on the flank face of carbide tools by femtosecond laser, to enhance the wear resistance of carbide tools and surface quality of machined compacts. The wear resistance of textured tools and quality of machined surface were evaluated in cutting tests of the green Al2O3 ceramics with these different flank-faced textured tools. Results showed that better flank wear resistance of textured tools and better quality of machined surfaces could be obtained by flank-faced textured tools than that by conventional tool (WT-0). The parameters of flank-faced textures had a significant effect on the flank wear resistance of textured tools and surface quality of machined workpieces. To achieve best wear resistance of cutting tool and surface quality of workpieces within the experiment parameters, the best parameters of the textures were chosen that width of the texture groove was 75 µm, spacing of texture groove was 100 µm, and distance of texture groove to main cutting edge was 75 µm. “Derivative cutting” to the hard inclusions in the surface of workpieces was happened at the textured grooves’ lower edge. It contributed to enhancement of wear resistance and the surface quality in a certain parameter of texture grooves.

Wear resistance of carbide tools with textured flank-face in dry cutting of green alumina ceramics

Green ceramics are the ceramic compacts before sintering, and there is no metallurgical bonding force between the powder particles. Therefore, it can be machined by traditional mechanical processing. Machining of green ceramics represents an alternative way to other shaping process, and offers a high degree of flexibility and economic efficiency for the machining of ceramic parts. In this paper, surface texturing with different geometrical characteristics was made on the flank face of the WC/Co carbide tools. Dry cutting tests on the green alumina ceramics were carried out with these flank-face textured tools and a conventional WC/Co carbide tool, the wear resistance of these flank-face textured tools was investigated. Results showed that there was only mild wear on the rake face, while flank face revealed serious abrasive wear. The flank wear of the flank-face textured tools was significantly reduced compared with that of the conventional one, and the flank-face textured tools with micro-scale grooves on the flank face parallel to the main cutting edge (AT-1) had the most improved flank wear resistance. Mechanism responsible was found that the textures on the flank face exhibited derivative-cutting phenomenon during dry cutting of green alumina ceramics, which served as the removal of hard inclusion between the tool-workpiece interface. The derivative-cutting was found to be beneficial to the decrease of the flank wear of the flank-face textured tools. The textures on the flank faces can also be acted as storage for powder chip which can protect the texture groove from abrasion. Textures on flank face had no obvious effect on the roughness of machined green alumina ceramic surfaces.