The present invention belongs to the technical field of engine parts manufacturing, and relates to
crankshaft processing and manufacturing, and specifically to a gauge and method for detecting the roughness of the fillet of a large
crankshaft journal, comprising a roughness meter, a support frame, the support frame comprising a base plate, a column vertically arranged on the base plate, and a posture adjustment device, the posture adjustment device comprising a lifting seat and a connecting block, the lifting seat being movably mounted on the column, the lifting seat being provided with a first rotating shaft, the connecting block being provided with a second rotating shaft, the second rotating shaft being horizontally arranged, the roughness meter being rotatably mounted on the second rotating shaft through its
tail end, when the roughness meter rotates around the second rotating shaft, the
stylus of the roughness meter rotates or swings in a
vertical plane; the detection method, adjusting the measuring rod to be parallel to the sampling arc chord, can adapt to the travel path of the
stylus for measuring the concave arc surface, solves the problem that the roughness fillet of a large
crankshaft cannot be quantitatively detected at present, and realizes the control of the consistency of fillet roughness in the production process.