PURPOSE: To easily and.surely form projections on a tube body in a stubbing method and the device in order to form plural projections on the outer circumference of the tube body.
CONSTITUTION: The stubbing method forms a projection 87 by projecting a punch 43 from a mandrel 31 toward a slit hole 81 after inserting the mandrel 31 inside a tube body 85 to be formed with the slit hole 81 in an interval corresponding to the projection 87. Further the stubbing device consists of the mandrel 31, a cam member 39 to be formed with a cam face 41 at the position opposing to a guide hole 35 to be inserted into a hole of axial length direction 33 of the mandrel 31, a punch 43 to be inserted into the guide hole 35 of the mandrel 31, an energizing means 49 to energize the punch 43 toward the cam face 41, and a moving means 63 to move the cam member 39 in the axial length direction of the mandrel 39.
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