The Study of Radius End Mills with TiB2 Coating When Milling a Nickel Alloy

Abstract

Nickel alloy high-speed processing technology using ball-end mills is characterized by high contact temperature and leads to accelerated tool wear. One of the effective ways to increase its reliability and service life is to modify the surface by applying functional antifriction layers in addition to wear-resistant coatings. Diamond-like carbon is often used as the latter. However, at cutting speed, when a cutting-edge temperature exceeding 650 °C is reached, the material of this coating reacts actively with oxygen in the air, and the sharply increasing adhesive component of wear quickly incapacitates the milling tooth, limiting its performance. Applying a coating of titanium diboride as an antifriction layer on top of nanocrystalline composite nitride coatings with good resistance to abrasive wear can be a solution to this problem. Our experiments have shown that such technology makes it possible to obtain a twofold increase in durability compared to a tool with a diamond-like antifriction coating in conditions when the cutting edge of the tool is subjected to cyclic thermal shocks above 800 °C, and the durability period of the radius end mill is about 50 min.

Effects of Ambient Temperature on the Mechanical Properties of Frictionally Welded Components of Polycarbonate and Acrylonitrile Butadiene Styrene Dissimilar Polymer Rods

“…Figure 5 shows the experimental setup for Shore A surface hardness, bending strength, impact energy, and thermal analysis of the weldments. To investigate the effects of ambient temperature on the mechanical properties of welded components, the specimens were placed in ten different ambient temperatures, i.e., 25,30,35,40,45,50, 55, 60, 65, and 70 • C. The X-ray spectroscopy (D8 ADVANCE, Bruker Inc., Billerica, MA, USA) was used to characterize the phase structure of the pure ABS, pure ABS, and weld joint of ABS/PC using X-ray radiation. After bending and impact, the fracture surfaces were investigated via a stereo OM (Quick Vision 404, Mitutoyo Inc., Tokyo, Japan) and FE-SEM (JEC3000-FC, JEOL Inc., Tokyo, Japan).…”

“…However, rare studies focus on the reliability of PC/ABS dissimilar polymer rods fabricated via RFW. Based on years of practical experience, the validity and reliability [24,25] of the frictionally welded components are related to the ambient temperatures significantly [26]. Therefore, the investigation of mechanical properties [27] of frictionally welded components at different environmental temperatures is an important research topic.…”

Tribological Properties of a Sliding Joint with an a-C:H:W Coating under Lubrication Conditions with PAO8 Oil and the Addition of 2% MoS2 Nanoparticles

“…In a lubricated mechanical machine, materials with identical mechanical properties are usually not used in the entire cross-section of the elements constituting mechanical pairs. Important tribological properties depend on the properties and structure of the surface layers of the elements of mechanical pairs, the lubrication conditions of lubricants and the lubrication methods [1][2][3]. The development of technology has introduced new fabrication methods of surface layers and the improvement of existing solutions to increase anti-wear and anti-seize properties [4].…”

Simulation of Mechanical and Thermal Loads and Microtexturing of Ceramic Cutting Inserts in Turning a Nickel-Based Alloy

“…The problem of the intense wear of the cutting edge under increased mechanical and thermal loads during cutting is well known [1][2][3]. Many scientists have devoted their research to the effect of microtexturing on the performance and operational life of cutting tools [4,5].…”