National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Machining technology of a thinwall part from titanium alloy
Rajm, Vojtěch ; Osička, Karel (referee) ; Chladil, Josef (advisor)
In the first part of this thesis, the basic knowledge of machining required for the subsequent sections was described. Then, titanium alloys, their properties, and heat treatment were described. The next part addressed the issues of machining titanium alloys with a focus on turning and milling technologies. The practical part began with an introduction to the production issues of thin-walled components made of titanium alloy in practice, which served as inspiration for this thesis. In the experimental section of thesis was explored influence of individual manufacturing operations and milling parameters on the surface flatness of thin-walled flat samples made of Ti6Al4V titanium alloy. The results were evaluated to identify the parameters that had the most significant impact on the flatness and deformation of the machined parts, and recommendations were provided regarding the minimization of deformations during milling of thin-walled components from titanium alloys.
Welding the frame of the tandem bicycle
Rajm, Vojtěch ; Sigmund, Marian (referee) ; Kubíček, Jaroslav (advisor)
In the first part of thesis were compared frames of two different bicycles and according to this comparison was designed a geometry of tandem bicycle. In a next part were described the most common materials in cycling industry and theirs advantages and disadvantages. According to the comparison, the steel EN 25CrMo was considered as the most suitable material for its low prize and high strength. After that is described weldability of steels and types of cracks which are one of the most casual defects in welded materials. In another part of thesis are theoretically described kinds of suitable welding methods for bicycle frames. As the most suitable are methods in shielding gases MIG/MAG and TIG. As the best method was chose TIG welding. In a practical part of thesis are compared these methods experimentally. Tubes from selected material were welded by MAG and TIG. The TIG welding proved again as better because of deeper and tough welds.

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