| Abstract [eng] |
Most of metal processing companies that is using fully automatic machining systems are faced with problems when they need to ensure required quality of parts during the production of the entire batch. Therefore, it is necessary to understand the influence of numerous factors on the quality of the parts, as this would help to ensure a stable machining process and making of poor quality parts could be avoided. The aim of the master's thesis is to understand the influence of numerous factors on the quality of precision parts during automatic machining process and to propose ways to avoid poor quality parts. During the work, the influence of machining modes (cutting speed, feed rate, cutting depth, cutting insert tip distance from the guide bush) on the dimensional accuracy and surface roughness were investigated. The titanium alloy Ti-6AL-4V was used in the tests. The influence of the change of temperature of the cooling liquid on the value of the dimension of the details was investigated. The wear of cutting inserts was also investigated. Inserts with three different wear types (normal plank wear, plastic deformation, fracture) was used. In this work machining modes for which the best quality parts are obtained was defined and the influence of each processing parameter on the result was found. A model of the dimensional value dependence on the temperature of cooling liquid has been developed. Also, the level of vibrations of tools with different wear types was measured. |
