Experimental Evaluation of The Laser Assisted Machining of Silicon Nitride Ceramics  

Oleh:

Incropera, Frank P. ; Pfefferkorn, Frank E. ; Rozzi, Jay C. ; Shin, Yung C.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal of Manufacturing Science and Engineering vol. 122 no. 4 (Nov. 2000), page 666-670.
Topik: ceramics; evaluation; laser assisted machining; silicon nitride; ceramics

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ93.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

Lihat Detail Induk

Isi artikel

To assess the feasibility of the laser assisted machining (LAM) process for the machining of difficult - to - machine materials such as structural ceramics, experiments were performed on silicon nitride workpieces for a wide range of operating conditions. Data for cutting forces and surface temperatures indicate that the lower bound of the material removal temperature for avoidance of cutting tool and / or workpiece fracture corresponds to the YSiAlON glass transition temperature (920 – 970 °C). As temperatures near the cutting tool increase to values above the glass transition temperature, the glassy phase softens, facilitating visco - plastic flow and, correspondingly, the production of semi - continuous or continuous chips. The silicon nitride workpiece machined had a surface roughness of Ra = 0.39 µm at the nominal LAM operating condition. Examination of the machined surfaces and chips reveals no detectable sub - surface cracking or significant changes in microstructure, respectively. Relative to grinding, the most significant advantage of LAM is its ability to achieve much larger material removal rates with high workpiece surface quality and reasonable levels of tool wear.

Opini Anda

Klik untuk menuliskan opini Anda tentang koleksi ini!

Kembali