Surface Roughness of Poly-crystalline Cubic Boron Nitride after Rotary Ultrasonic Machining

Abstract

Rotary ultrasonic machining (RUM) is suitable particularly for machining hard and brittle materials, such as glass and ceramics. This contribution investigates the machining of poly-crystalline cubic boron nitride (PCBN) by using this advanced machining method. In the experiment, a tool for friction stir welding (FSW) was manufactured. Such tool is 1pprox.1 for welding the materials with enhanced mechanical properties. The research was focused on machined surface roughness, because roughness has a significant influence on the welding process, especially on sticking ability. If roughness of the tool is too high, the welded material will stick on the tool and the weld cannot be fabricated. According to the performed experiment, RUM seems to be a proper method to manufacture a FSW tool, owing to the low roughness achieved (Ra 0.24 μm).

Influence of Ultrasonic Assistance on Delamination During Machining of Different Composite Materials

“…This machine tool can operate continuously in five axes and it can operate as a conventional milling machine, high speed cutting machine, high feed milling machine, ultrasonic assisted milling machine and rotary ultrasonic milling machine. It is therefore able to machine almost every material [12,13,14]. GFRP material was provided by the Slovak company Armastek.…”

First principles studies of electronic and optical properties of helium adsorption on Sc-doped BN monolayer

“…Boron nitride (BN) is a chemical compound with chemical formula BN, consisting of equal numbers of boron and nitrogen atoms [14][15][16][17][18][19][20][21]. BN is isoelectronic to a similarly structured carbon lattice and thus exists in various crystalline forms.…”

“…BN is isoelectronic to a similarly structured carbon lattice and thus exists in various crystalline forms. The hexagonal form corresponding to graphite is the most stable and softest among BN polymorphs, and is therefore used as a lubricant and an additive to cosmetic products [14][15][16][17][18][19][20][21]. The cubic (sphalerite structure) variety analogous to diamond is called C-BN.…”

“…The cubic (sphalerite structure) variety analogous to diamond is called C-BN. Its hardness is inferior only to diamond, but its thermal and chemical stability is superior [14][15][16][17][18][19][20][21]. The rare wurtzite BN modification is similar to lonsdaleite and may even be harder than the cubic form.…”

“…Because of excellent thermal and chemical stability, BN ceramics are traditionally used as parts of high-temperature equipment. BN has potential use in nanotechnology [14][15][16][17][18][19][20][21]. Nanotubes of BN can be produced that have a structure similar to that of carbon nanotubes, i.e., graphene (or BN) sheets rolled on themselves, but the properties are very different [14][15][16][17][18][19][20][21].…”