PROCEDIMIENTO PARA MECANIZAR EN LA OBRA,UNA CAMARA ESPIRAL DE MAQUINAS HIDRAULICAS

摘要

The present invention relates to a machining process especially suitable for facilitating the construction of large turbines wherein displaceable guide blades for directing fluid to the rotor have to be provided on the downstream side of the volute or spiral tank of the turbine. Hitherto the whole unit had to be machined and assembled in the workshop and then transported to site. The present invention provides for an on site in situ machining process for mounting displaceable guide blades and comprises securing pairs of bases to an annulus of crosspieces located in the tank with each base having machined surfaces defining a hole therein and with said pairs of bases being positioned with the holes thereof being parallel to each other and in coaxial alignment, and then using said bases as a positioning template for a machining device for machining a plurality of portions each having roughly cut-out holes provided in extension means of a ring member forming part of said annulus of crosspieces which extends in a direction towards the space in which the rotor of said machine turns.