| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of squeezing work, which method can achieve high accuracy of the roundness formed by the squeezing work, and can form a flange portion in a short period of time after reducing a diameter of a pipe. SOLUTION: In the method of the squeezing work, a diameter-reducing process is carried out by squeezing rollers R1, R1 attached to a tool mounting base 3. In the diameter-reducing process, a workpiece W is moved in parallel to a main spindle 2, and the moving locus B of the squeezing rollers R1, R1 traces a curve to gradually proceed outward from a deepest portion A, and the end portion of the blank has a diameter larger than that of the deepest portion. Next, flange forming rollers R2 attached to the tool mounting base 3 are pressed against the end portion formed so as to be expanded in the diameter-reducing process. Thus, the flange portion Wb is formed. COPYRIGHT: (C)2008,JPO&INPIT
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