Vehicle crankshaft journal angle rounding tool

The invention relates to a vehicle crankshaft journal angle rounding tool which comprises a tool body, round corner shaping blades and a tool bar arranged on a tool platform of a machine tool. A dovetail groove is arranged in the tool bar. Tool grooves are respectively arranged in four corners of the front end face of the tool body. Four round corner shaping blades are respectively arranged in the tool grooves and are tightly pressed and fixed through screws. A dovetail protrusion is arranged on the rear portion of the tool body. The tool body is matched with the dovetail groove of the tool bar through the dovetail protrusion and is inserted into the tool bar and is tightly pressed and fixed through a hold-down mechanism. In the working process, two round corner shaping blades on the upper portion are used for achieving turning to round corners of a crankshaft journal. When the two round corner shaping blades on the upper portion are worn, the tool body can be rotated at 180 degrees, the remaining two good round corner shaping blades can be used continuously, and production efficiency is improved. The vehicle crankshaft journal angle rounding tool is simple and reasonable in structure, convenient to operate and use, and high in tool replacing and assembling efficiency, and is an ideal tool for turning the round corners of the crankshaft journal.