Press-molded product and method of manufacturing same
AssigneeNissan Motor Co., Ltd.
InventorsShinichi Matsuda, Kenji Kanamori
Life of this patent
Estimating the term…
Abstract
Methods and apparatuses for manufacturing a press-molded product with a preform including a pair of side wall portions and a connecting wall portion are taught. The preform is pressed with a mold until at least one wall portion is bent toward a gap within the mold, and a plate thickness is increased at the at least one wall portion and the connecting wall portion by pressing other wall portions.
Claims17
A method of manufacturing a press-molded product using a preform, the preform comprising a pair of spaced side walls connected by a connecting wall and having a cross sectional thickness, the preform having a protrusion along a partial length thereof, with the protrusion defining the partial length as a prearranged portion of the preform and being such that a cross sectional periphery of the preform is longer along the prearranged portion than along a portion of the preform surrounding the prearranged portion, the method comprising:
- pressing the preform within a mold cavity formed between a die portion and a punch portion received within the die portion, the cavity having a cross sectional thickness when the punch portion is fully received in the die portion that is greater than the cross sectional thickness of the preform;
- and
- increasing the cross sectional thickness of the preform along the prearranged portion by compressing the protrusion to flow material of the protrusion into the connecting wall and at least one of the side walls of the prearranged portion.
A method of manufacturing a press-molded product using an elongate preform, the preform having an original plate thickness and comprising a pair of spaced side walls connected by a connecting wall, such that the preform has a generally hat shaped cross section, the preform having a protrusion along a partial length thereof, with the protrusion defining the partial length as a longitudinal prearranged portion of the preform and being such that a cross sectional periphery of the preform is longer along the prearranged portion than along a portion of the preform surrounding the prearranged portion, the method comprising:
- pressing the preform within a mold cavity formed between a die portion and a punch portion received within the die portion and a lateral mold, the cavity having a cross sectional thickness when the punch portion is fully received in the die portion that is greater than the original plate thickness, the lateral mold controlling a movement of opposing longitudinal ends of the preform;
- and
- compressing the protrusion to flow material of the protrusion into the connecting wall and the side walls of the prearranged portion, such that the cross sectional periphery of the preform along the prearranged portion is substantially the same as the cross sectional periphery of the preform along the portion surrounding the prearranged portion, a cross sectional thickness of the prearranged portion is increased from original the plate thickness, and an length of the preform is substantially unchanged.
Dependencies are inferred from the claim text.