Experimental Study On Cold-Blast Air Machining

Cutting force and tool wear are the results of interaction between the tool and the work piece. Cutting force and tool wear, which are important physical phenomena occur during the cutting process, have important influence on the cutting process. Cutting force will directly affect the cutting power and cutting heat; tool wear can affect the work piece quality and production costs, and cause process system deformation and machine tools vibration. Cutting force and tool wear, therefore, are the important design criterion of machine tool, cutting tools and jigs. To grasp the change regularities will be of great guiding significance for the analysis and resolution of practical problems in the production.In metal machining, cutting liquid will cause environment pollution, and it is harmful to the human body. It has been more and more restrictions for the use of cutting liquid. Green Manufacturing, which caters to the ISO14000 environment standard, and is in line with requirements of sustainable development, is the future trend of machining development. The cold-blast air cutting as a new kind of green manufacturing technology differs from the traditional cutting cooling methods. The friction result between the tool and the cutting chip, the tool and work piece are different by different cooling methods. The specific external reflection is that cutting temperature, cutting force, tool life and surface quality of work piece are somewhat different from the traditional processing methods.The experiments using three kinds of metal material, steel Q235B and 45 as well as titanium alloy TC4 under three different cooling conditions, are carried out in this subject, in order to find the variation of cutting force and tool wear under cold-blast air cooling condition. The following three aspects are obtained in the research works:1. Aimed at three cooling methods, cutting force are tested and analyzed. The conclusion that the cutting force is the smallest under the cold-blast air condition is obtained. And an important phenomenon that the cutting liquid cannot play its proper cooling and lubrication roles, but increased the amount of cutting force and tool wear while cutting steel Q235B is found.2. The empirical formulas of cutting force suitable for cold-blast air machining are established for the test materials, and a conclusion obtained after statistical test is that the cold air's temperature is an index of cutting force.3. Comparing different materials at different cooling conditions, tool wear is minimal in the cold air condition. At the same time, it showed again that when cutting Q235B the cutting fluid was not only failed to play its proper cooling and lubrication roles, but also increased the amount of cutting force and tool wear from the perspective of tool wear.