Content:
Theory teaching
Introduction. Machine elements, Machine elements selection.
Standardizations. Tolerances and fits, surface quality, shapes and positions.
Mechanical design process. Types of Loading and Stress ratio, Force, Torque, Tension, Deformation, Strains, Safety and Reliability design and safety factor. Impact strength. Stress concentrations. Fatigue of materials.
Pipes. Design according with kind of materials. Pipe connection. Theory of flow through the pipe, Calculations.
Welded joints, type of joints, designing, technology of welding and checking.
Screws. Standard threads. Analyses of forces. Ratio of external and inner forces, deformations diagram. Sharing of loads on the threads, melioration of loads sharing. Assurance of screw against self-wrench. Calculations of screws with variable load. Materials. Designing of screws.
Springs. Mechanical transmissions. Power, torque, ratio. Friction transmission.
Gears transmission. Gear selection: helical gear, spur gears, bevel gears, worm gears. Geometry and Kinematics of different types of gears. Velocity ratio Tooth profile. Gears calculations of strength. Designing of gears. Lubrications and cooling. Planetary gear and their application in the mining machines.Belt Drives. Principles. Geometry, Calculations of belts. Types of belts.Chain Drives. Tips ob chains. Designing and calculations.Shafts, axles, Selection. Designing, application on the mining machines. Calculations. Shaft Rigidity and Dynamic consideration.
Keys. Design and calculations.
Locking assemblies and shrink discs.Bearings. Designing. Selection and application. Cylindrical, Needle, Spherical, Tapered, Thrust bearing. Permissible angle of arrival, calculations, sealing. Life duration. Bearing manufacturers data. Mounted bearings. Anti-friction bearings, designing, hydrodynamic lubrication. Calculation.Couplings. Selections. Applications. Calculations. Rigid couplings, flanged couplings, Flexible shaft couplings, friction couplings, and other couplings. Practical teaching
At the exercises, students take two tests in order to check the theoretical knowledge. Students also take five tasks from area of: pipelines, welded joints, screw bolted joints, shafts, rolling bearings. Name of projects are: pipeline for underground mining drainage, welded joints on the steel construction of mining machine, screw bolted joint on oil pipeline flange, gear box shaft, roller on belt conveyor. Through mentioned project tasks, students calculate dimensions, solve the problems of elements selections, checking of safe factor. Technical drawing. |
