US 10,471,493 B2Granted

Pressed component manufacturing method, press, and press line

AssigneeNippon Steel Corporation

InventorsToshiya Suzuki, Yoshiaki Nakazawa, Masahiro Nakata

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Abstract

Disclosed is a method to manufacture a pressed component from an intermediate stock, which includes two bent portions with a spacing thereof narrower than a width of a top plate of the pressed component, by employing a press including a die having a die pad and a punch having an inner pad, the method including: gripping a portion between the bent portions with the inner pad and the die pad in a state in which the inner pad projects from the punch and the die pad projects from the die; moving the die toward the punch side to form vertical walls of the pressed component with the die and the punch; and integrating the die and the die pad and then moving the die, the die pad and the inner pad toward the punch side to form the top plate.

Claims18

Dependent claims

A method to manufacture a pressed component from an intermediate stock by employing a press including

a die that is provided with a die pad that moves in a pressing direction,
and a punch that is disposed opposing the die and that is provided with an inner pad that moves in the pressing direction,
the pressed component including
a top plate having a top surface and a bottom surface, and a thickness in the pressing direction and a width extending along a direction intersecting the pressing direction,
a pair of ridge line portions, each of the pair of ridge line portions positioned on a respective end of the top plate in the width direction, and
a pair of vertical walls, each of the pair of vertical walls extending from the respective one of the pair of ridge line portions in a direction from the top surface towards the bottom surface of the top plate, and
the pressed component manufacturing method comprising:
providing the intermediate stock having a top surface and a bottom surface, a width extending along the direction intersecting the pressing direction, and a pair of bent portions, each of the pair of bent portions positioned on a respective side of the intermediate stock in the width direction, and inflected in a direction from the top surface towards the bottom surface of the top plate, with a spacing between the pair of bent portions set as a narrower spacing than the width of the top plate;
gripping a portion of the intermediate stock between the pair of bent portions with the inner pad and the die pad, with the bottom surface of the intermediate stock facing toward the inner pad, by projecting the inner pad from the punch toward the die and the die pad from the die toward the punch, respectively;
moving the die toward the punch relative to the die pad, the inner pad, and the punch, thereby forming the pair of vertical walls with the die and the punch;
and
moving the die and the die pad, and the inner pad, relatively toward the punch after the die pad is at a closest position to the die thereby forming the top plate.

9 more elements

A press line comprising:

a press including:
a punch that includes:
an apex portion intersecting a pressing direction,
an inner pad housing portion formed in the apex portion,
punch shoulders disposed at both sides of the apex portion, and
punch wall faces extending from the respective punch shoulders;
an inner pad that includes an inner pad apex face intersecting the pressing direction, that is housed in the inner pad housing portion, and that moves in the pressing direction;
a die that includes:
a die bottom as a counterpart to the apex portion,
a die pad housing portion formed in the die bottom,
bottom corners disposed at both sides of the die bottom as counterparts to the punch shoulders, and
die cavity wall faces extending from the respective bottom corners as counterparts to the punch wall faces;
and
a die pad that includes an inner pad-opposing face opposing the inner pad apex face, that is housed in the die pad housing portion, and that moves in the pressing direction;
and
a pre-forming apparatus including:
a pre-forming punch that includes:
a pre-forming punch recess including:
a pre-forming punch recess bottom face intersecting a pre-forming pressing direction and having a width that is narrower than a width of the apex portion of the punch and is a width of no less than a width of the inner pad apex face,
pre-forming punch recess corners disposed at both sides of the pre-forming punch recess bottom face, and
two pre-forming punch recess inclined faces adjacent to the pre-forming punch recess corners and forming a larger angle with respect to each other than an angle formed between the two punch wall faces;
pre-forming punch shoulders disposed at both sides of the pre-forming punch recess;
and
pre-forming punch side-wall faces adjacent to the pre-forming punch shoulders;
a pre-forming die that is disposed opposing the pre-forming punch, and that has a die cavity including:
pre-forming die cavity wall faces as counterparts to the pre-forming punch side-wall faces,
a pre-forming die bottom disposed between the pre-forming die cavity wall faces, and
a pre-forming die pad housing portion formed in the pre-forming die bottom;
and
a pre-forming die pad that is housed in the pre-forming die pad housing portion, that moves in the pre-forming pressing direction, and that includes:
a punch bottom face counterpart face as a counterpart to the pre-forming punch recess bottom face, and
punch inclined face counterpart faces as counterparts to the pre-forming punch recess inclined faces.

29 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/781,651Filed 7 Dec 2016
Priority: JP 2015-2394258 Dec 2015
Published: US 2019/0176204 A113 Jun 2019
Granted: 12 Nov 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B21D 22/26
Deep-drawing: for making peculiarly, e.g. irregularly, shaped articles
B21D 5/01
Bending sheet metal along straight lines, e.g. to form simple curves: between rams and anvils or abutments
B21D 22/24
Deep-drawing: involving two drawing operations having effects in opposite directions with respect to the blank
B21D 24/06
Blank holders; Mounting means therefor: mechanically spring-loaded blank holders