| 摘要 |
A method of and apparatus for forming projections on tubular members or the like in which the tube forming apparatus rotates with respect to the tubular article being formed. A mandrel is provided with camming wedge members which actuate spherical forming members when the mandrel is reciprocated. Each spherical forming member projects through an aperture in a housing member which closely surrounds the mandrel. In this manner the spherical forming members engage a tubular article on the mandrel and force the contacted portion of the tubular article into a die member. The mandrel, housing member and spherical forming members are then rotated with respect to the tubular article to be formed whereby a predetermined projection is formed on the tubular article.
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