الفهرس 
AbstractOnly 14 pages are availabe for public view
 |  | from | 163 |  |  |
| | | from | 163 | | |
Abstract
There are several types of cutting fluids which may be used for metal cutting operations. Most of the cutting fluids are mineral oil-based fluids and these fluids increase productivity and the quality of manufacturing operations by cooling and lubricating during machining and forming processes. The other types of cutting fluids were synthetic and semi-synthetic cutting fluids and they are widely used. Recently, it is reported that about 80% of all occupational diseases of operators were due to skin contact with petroleum cutting fluids. Petroleum-based oils are replaced by vegetable oils because vegetable oils are environmentally friendly, renewable, less toxic and readily biodegradable. Consequently, vegetable-based oils are more potential candidates for use in industry as cutting fluids. The following objects in this thesis were studied : A brief study of most previous researches was introduced. Theoretical comparative study between advantages and disadvantages of all cutting fluids was reported. A new bio based cutting fluids from various vegetable oils were developed. The vegetable oils which used in this study were sunflower, olive, coconut, linseed, and castor oil. An experimental comparative study was reported between both a new cutting fluids developed from vegetable oils and commercial petroleum mineral oil during turning operation at different cutting conditions. Performances of cutting fluids were compared with respect to surface roughness and cutting forces during longitudinal turning of mild steel. The results of this work indicated that: The use of vegetable oils as new metal cutting fluids in reducing the cutting forces and improving the surface finish at different cutting conditions gave good competitive results compared with mineral oils. All vegetable based cutting fluids which were used in comparison at cutting all cutting condition used achieved a decrease in cutting forces and average values of surface roughness compared with using mineral oil, therefore improvement in cutting operation results. This comparative study showed that mineral oil based cutting fluids can be replaced by the vegetable based cutting fluids, thus reducing the occupational health risks associated with petroleum oils.