Rancang Bangun Fixture Perakitan Runner dan Casing Turbin Cross Flow

Abstract

One of the important turbine components to consider in its manufacture is the runner and turbine casing components. The large number of parts that must be welded and the use of tools that do not meet functional requirements causes some problems during the assembly process, the problem is due to the difficulty of obtaining straightness between the disc and runner shaft where both components occur run-out deviations that exceed the allowable tolerance, as well as casing component assembly where almost all of the joints undergo a simple welding process and use of aids causing a very large dimension deviation from the specified tolerance. The use of very simple tools will cause difficulties in controlling the dimensions or uniformity of the shape during the production process. For this reason, a fixture that is suitable for the runner and turbine casing is needed to get the assembly process that matches the specified geometry tolerance. This research makes the fixture design to be used in runner assembly and turbine casing assembly with the assembly method is carried out in stages. The design is done in five stages, namely the stage of problem statement, the stage of making needs analysis, the stage of gathering information and ideas, the stage of making temporary designs and the stage of making the final draft. Fixture manufacturing is done in two stages, namely ordering materials (purchasing materials) and making fixture components. The final result of making runners and casings using a fixture is able to reduce the aberration in the runner and turbine casing components by producing run-outs at runners of 2.0 mm and the straightness of the casing straightness of 1.6 mm, but have not been able to achieve deviations from the targeted one mm.