US 2006/0185414 A1Published application

Method and apparatus for producing cylindrical components having bent portions

AssigneeDenso Corporation

InventorsHiroshi Shohara, Tatsuji Hayashi, Yuji Eguchi, Shigeo Hattori

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Abstract

A preparatory molding roll 4 having a convex push surface 41 is pushed to an outer peripheral surface of a work 1A while the work 1A is chucked by a pair of molds 2 and 3 and is rotated by applying axial propelling force, to bend inward the outer peripheral surface of the work in a radial direction. The work is then chucked by the preparatory molding roll and the upper and lower molds. Next, the preparatory molding roll is moved back and the work is crushed in the axial direction to form a bent portion 1a. A molding roll 5 is pushed to mold the outer shape of the work. A grooved roll 6 is next pushed to the outer peripheral surface of the work and a groove 1b is formed on the outer peripheral surface.

Claims5

Dependent claims

A production method of a cylindrical component having a bent portion through rolling by pushing rolls to a cylindrical work obtained from a pipe material, comprising:

a preparatory molding step of advancing a preparatory molding roll having a push surface shaped into a convex shape on an outer peripheral surface thereof and pushing it to an outer peripheral surface of a work while said work is chucked by a pair of molds and is rotated by applying axial propelling force, to bend inward the outer peripheral surface of said work in a radial direction;
and
a crush-molding step of clamping the sheet thickness of said work by said preparatory molding roll and said pair of molds having a dead pocket, then moving back said preparatory molding roll and crushing said work in the axial direction to form the bent portion.

Dependencies are inferred from the claim text.