Abstract: Aiming at the problems that the large load of traditional broaching process and the traditional cutting fluid has certain harm to the environment, the application research of the green vegetable oil cutting fluids in the broaching process was investigated. Conventional broaching oil and five vegetable oils such as pure castor oil, corn oil, sesame oil, olive oil and soybean oil were used as cutting fluids, and were sprayed into the broaching area by a minimum quantity lubrication (MQL) system. The experimental scheme of the dry broaching on front half of broach tool and the oil broaching on back half was designed by dry broaching as control. The performances of the cutting fluids were tested by the broaching experiment system. The effects of different vegetable oils on broaching load and surface roughness were studied by the molecular structure of vegetable oil. The results indicate that the application of sesame oil has the best broaching performance. In addition, compared with conventional broaching oil, the application of misco sesame oil ubricating can obviously reduce broaching load, and the average value of wave peak and wave valley in broaching load chart is increased by 74.0% and 63.2% respectively, and the surface quality is increased by 22.1%. This helps to improve the broaching performance and it has practical application value.
Key words: broaching force; vegetable oils; green cutting fluid; minimum quantity lubrication