Technological Failures Research at Aluminum Parts Processing on Automatic Lathes

摘要

Processing in large numbers of small profiled parts shall be made usually on semiautomatic and automatic lathes. Outer turning with circular form tool and also drilling are the most common operations in such cases. In a particular case, during tests in preparation stage of manufacturing technology, have found numerous unconformities and even accidents, reason for which also capability testing for those parts went out negative. There is thus a problem and she had solved: researching the causes of nonconformities and restore the quality and precision parameters of parts made. To solve this problem was commissioned a group of experts from the company, supervised also advised by two experienced researchers from a specialized institute. The research method used was the classical experimental processing established by a scientific program, the input data consisted of working parameters for outer turning with circular form tool (radial feed speed) and respectively drilling with a bit (speed and axial feed), and output data collected were the following: the main cutting force, the machined surface quality and the accuracy of dimensions of parts machined. The results obtained after the completion of experimental program were processed as graphs and charts and various observations collected over have undergone thorough analysis by specialists with great experience. Rigorous interpretation of the above results allowed the issuance of a series of recommendations on selecting the most appropriate working regime for turning and drilling respectively, and developing a written procedure to be followed to avoid future of such processing failures.