Manual positioning tool for arc casting

The utility model relates to the technical field of casting machining, in particular to a manual positioning tool for arc-shaped castings, which comprises a base plate, a plurality of upright posts, a clamping mechanism and a plurality of arc-shaped supporting pieces. A plurality of mounting plates are arranged on the substrate; the plurality of vertical columns and the plurality of mounting plates are detachably connected through bolts in a one-to-one correspondence manner; the clamping mechanism is arranged on the base plate and can abut against or be away from the casting. The multiple arc-shaped supporting pieces and the multiple mounting plates are detachably connected through pins in a one-to-one correspondence mode. The multiple stand columns, the clamping mechanism and the multiple arc-shaped supporting pieces are matched with one another so that a casting can be supported and clamped. The mounting plate can be regarded as a reference arranged on the base plate in advance, so that the positioning prec