Roll forming method and device
AssigneesMazda Motor Corporation, Samtech Corporation
InventorsMasahiro Dohi, Yoshiyuki Yamashina
Life of this patent
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Abstract
A roll forming method is used for forming an annular product with a radially outwardly extending flange portion at an end and includes steps of holding a center portion of a work for forming the annular product by a holding device, rotating the work, contacting a circumferential end portion of the rotating work with a forming roller to be pressed to form the flange portion while retaining a circumferential outer end of the work. The present invention is advantageous in that the resultant product has a good quality without deficiency, such as underfill of the material and has an improved toughness unlike a cast product, a product made by welding and the like of the same structure.
Claims9
A roll forming method for forming an annular product with a radially outwardly extending flange portion at an end by using a mandrel formed with a stepped portion for forming said flange portion comprising the steps of:
- holding a center portion of a work for forming said annular product with the mandrel,
- rotating the work,
- engaging the work with a forming roller,
- contacting a portion of the work with the stepped portion of the mandrel,
- pressing the portion of the work against the stepped portion with the forming roller to form said flange portion, and
- restricting an outer end of the flange portion from expanding radially outwardly while rolling the work.
A roll forming device for forming an annular product with a radially outwardly extending flange portion at an end by using a mandrel formed with a stepped portion for forming said flange portion comprising:
- a holding device for holding a center portion of a work for forming the annular product,
- rotation means for rotating the work,
- a forming roller for engaging the work so that it forces a portion of the work into contact with the stepped portion of the mandrel and presses the portion of the work against the stepped portion to form the flange portion, and
- restricting means for restricting an outer end of the flange portion from expanding radially outwardly while engaging the work with the forming roller.
Dependencies are inferred from the claim text.