Abstract
The cutting resistance, surface finishing, chip formation and tool life were tested. The cutting resistance decreases with accelerating the cutting speed and keeps a constant value at cutting speed beyond a certain value. If a large side rake angle tool is used, the cutting resistance is scarcely affected by cutting speed. Surface finishing is smoother at the cutting speed 300 to 400 m/min and small feed, and deteriorates with acceleration of cutting speed. The tool life is prolonged by use of a small side rake angle tool at lower feed.It is scarcely affected by feed when increasing the side rake angle. Nearly a constant temperature is held at the cutting speed more than 300 m/min. The temperature is independent of the feed at accelerated cutting speed. Coiled type and devided flow type chips form. The machinability of Al-Si alloys is effectively improved by solidification under the hydraulic pressure without modification and degassing.
