In the machinery industry, reduction in manufacturing cost is recognized as a serious problem with the death of a company rather than a mere competitiveness of the industry. For this reason, process improvement is a key task in the machining field, an...
In the machinery industry, reduction in manufacturing cost is recognized as a serious problem with the death of a company rather than a mere competitiveness of the industry. For this reason, process improvement is a key task in the machining field, and it is actively investing in expensive equipment and tools. For tools, which are an important factor in machine cutting, extensive research and development on tool shape, grade and coating are conducted for high productivity and precision.
Current industrial parts are shifting from functionality-oriented to lightweight for design and performance improvement. Due to this, as the number of 3D-shaped parts increases, drilling that requires a flat surface has a problem in that cutting time increases as a cutting process that creates a flat surface is added in a curved shape.
Through an experiment using a carbide drill, which has a higher modulus of elasticity than a high-speed steel (HSS) drill, statistical analysis of cutting characteristics on the inner diameter, position, roundness, and squareness is performed to suggest the amount of change according to the cutting conditions and surface machining before hole machining.
In this study, STS316L, which is mainly used for industrial piping and heat exchangers, was used because it has strong resistance to intergranular corrosion among stainless austenite series used in all industrial fields and hardly generates rust even when the weld is exposed to salt. The analysis of cutting force and tool deflection is conducted by using the finite element analysis technique, and carbide solid drilling is performed to measure the inner diameter, position, roundness, and squareness according to the change in cutting conditions to determine the machining results. The optimal cutting conditions was found by identifying the influencing factors through analysis of variance (ANOVA).
Finally, according to the main contribution of the experiment, it is judged that the influence on the cutting force, the bending of the tool, and the inner diameter has the highest influence in the order of the angle of the machining surface, the feed rate, and the cutting speed. It is judged that the influence is high in the order of angle, cutting speed, and feed rate.
In addition, as a result of analyzing the angle of the machining surface, cutting speed, and feed rate in the cutting experiment, it was found that the perfect (ideal) dimension was close when the angle of the machining surface was low and the cutting speed and feed rate were high. It is expected that the results of this study will be useful for economical machining by suggesting optimal conditions for machining inclined surfaces of carbide solid drills.