The present Master's thesis includes the entire development and construction of an automatic cross-cut saw, which is intended for use in the wood industry. This kind of systems are frequently found in the primary and secondary phase of processing wood as a part of larger production lines. In our case, a cross-cut saw stands as an independent wood-crafting machine, adapted for use in woodworking business in the production of joinery, flooring, CNC semi-finished products, etc.
So, it is about the uniaxial controlled electromechanical system, which on the basis of an order, offers to the user a fast and precise linear cutting of wooden slats. The simple use and simplification of existing procedures of this kind of processing are the most important.. Due to the limited space and working conditions, compactness and robustness of the system are additionally required.
The Master’s degree comprises all development procedures used from the concept to the final structure of the machine. The introduction presents mainly the requirements and limitations of the system. It shows the current procedure that was used before the construction of the machine and its essential flaws. In short, the goals set before the development of the machine are introduced, too. Further on, we represented individual phases of the development and construction.
The design process of mechanical parts is presented on the basis of advanced 3D models of individual subassemblies. We separately discuss previously used electromechanical components and later the complete composition of the framework of cross-cut saws. The used sensor equipment is thoroughly described through the functions individual sensors perform. First of all, it is about detecting the end position of pneumatic cylinders and other mechanical parts for which multiple sensors are used - inductive switches, magnetic sensors and the optical sensors. Completely independently a specific luminescent sensor used to detect marks on the wooden surface of the workpiece, is pointed out. The other electronic components are presented by displaying the control and servo system. The majority of the system comprises a set of user's terminal, program logic controller, motion controller, servo amplifier and servomotor. It is described in detail through the presentation of the basic functions of individual components as well as through the composition and organization of the electrical cabinet.
The last part of the thesis considers developed control program and the user's program environment, which allows the user to operate the machine. Through examination of the program sequences, we presented the way the system works and the functions it provides.