| 摘要 |
PROBLEM TO BE SOLVED: To grind a work with high precision by practically eliminating a bending stress on the work. SOLUTION: In grinding a crankpin part 22d of a crankshaft 22, both end journal parts 22a and 22d of the crankshaft 22 are externally held on chucks of holding mechanisms, in which state the crankshaft 22 is rotated on the axis of the journal parts 22a. If the crankshaft 22 is a five-cylinder crankshaft with five crankpin parts 22d, when the crankpin parts 22d located from one end to the other of the crankshaft 22 are designated as a first to a fifth crankpin part 22d-1 to 22d-5, grinding is executed on a combination of the first and fourth crankpin parts 22d-1 and 22d-4, on a combination of the second and fifth crankpin parts 22d-2 and 22d-5, and on the third crankpin part 22d-3.
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