Three-coordinate positioning testing fixture for special-shaped workpiece of compressor cylinder blank

The utility model discloses a three-coordinate positioning testing fixture for a special-shaped workpiece of a compressor cylinder blank, which is characterized in that a plurality of workpiece clamping positions are arranged and distributed on the positioning testing fixture along the Y direction, and the clamping positions rotate and position the workpiece on a vertical plane formed by the X direction and the Z direction; the positioning gauge comprises a U-shaped rotating frame, a U-shaped positioning plate and a brake unit, the U-shaped positioning plate is rotatably supported on the U-shaped rotating frame, and the brake unit for providing brake damping for the U-shaped positioning plate is hinged to the outer wall of one side of the U-shaped rotating frame. The checking fixture can realize batch clamping and positioning of blank irregular workpieces during three-coordinate checking, the workpieces are convenient to disassemble and assemble, and the positioning precision is high. 本实用新型公开了一种压缩机汽缸毛坯异形工件的三坐