||Experimental analysis of cutting fluid efficiency in reamin and tapping stainless steel, carbon steel, brass and aluminium
||Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
||The choice of an appropriate cutting fluid to use in machining processes is essential to assure a good quality of the process itself. The execution of cutting fluids tests is therefore important as it gives results for the right choice. Even if there are a lot of indirect methods for the evaluation of cutting fluids performances, the best way to achieve the evaluatuion of a cutting fluid efficiency is to carry out tests where a real machining process is involved. The test has to be as similar as possible to the actual production method. Vegetable based cutting fluids are to be preferred to mineral based due to their lower environmental impact. The latest laws are becoming more and more restrictive. Therefore vegetable based cutting fluids are required to have higher performances in order to achieve an efficiency improvement and a reduction of the quantity of cutting fluid used, at the same time. So cutting fluid tests are essential not only for a correct choice but also to give fundamental indications for the development of new cutting fluids.
A standard procedure was developed to carry out reaming and tapping tests aiming to the evaluation of cutting fluids efficiency. Reaming and tapping tests, machining specimens made of 4 materials (stainless steel, C45, brass and alluminium) with 5 different cutting fluids (1 mineral based oil and 4 vegetable based oils), were carried out according to the mentioned standard procedure. All the specimens were measured on a coordinate measuring machine to obtain geometric informations in order to assure the test quality. Machining processes were carried out on a vertical numerical controlled milling centre. A fixture for a single specimen was mounted inside the machining centre. The specimen was fully immersed in the cutting fluid. Cutting forces were acquired using a piezoelectric dynamometer connected to an acquisition system. The whole acquisition system was calibrated before starting the tests (calibration uncertainty was 2%).
Cutting fluids efficiency was evaluated comparing mean torque in machining using different cutting fluids. One of them was taken as a reference. The cutting fluid chosen as reference was the mineral based one (RM), widely used in production. Percentual efficiency results in reaming and tapping various materials are shown together with their standard uncertainties (calculated according to GUM) in the following tables:
Creation date: 2006-06-22
Update date: 2008-01-10