2007 Volume 93 Issue 3 Pages 257-261
Precision machinery parts maker uses many grinding machines, then by-produce a lot of grinding sludge. Most of which is dumped into landfills now as industrial waste. Recycling technology which enables environmental load reduction for ISO14001 and cost reduction at the same time was investigated. One of the key technologies to establish recycling system for grinding sludge is a development of practical briquetting machine which enables low-cost, energy save and compact. At first an AC servo motor drive briquetting machine was developed to analyze the best briquettig condition. Oil-based grinding sludge contains a lot of oil in the grinding swarf, so it is difficult to squeeze out because of its high viscosity. If pressing it with high pressure at the beginning of briqueting process, grinding sludge blows out. By using a test machine, the best briquetting condition was investigated for oil-based grinding sludge. Test results pointed out that the most important factor for briquetting is that the beginning of squeezing process needs to be controlled under low pressure with appropriate speed to avoid blow-out. Based on the test results, a low-cost practical briquetting machine was developed which could contribute to grinding sludge recycling for environmental load reduction.