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Hot stamping molded article and method and device for manufacturing hot stamping molded article

A manufacturing method and technology of molded products, which are used in transportation and packaging, superstructure sub-assemblies, vehicle components, etc., can solve the problems of complex control, high price of servo die buffers, and inability to break folds at low prices. Effect

Active Publication Date: 2020-05-01
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The servo die buffer used in the invention disclosed in Patent Document 3 is not only expensive, but also complicated to control
Therefore, in the invention disclosed in Patent Document 3, it is not possible to suppress cracking and wrinkling at low cost and easily.
[0020] Also, even if the gap between the die and the part where the punch is sandwiched by the flange is controlled by the die used in the invention disclosed in Patent Document 4, wrinkling cannot be completely suppressed
[0021] Thus, in the conventional technology, the A-pillar lower outer side panel with a tensile strength of 1200 MPa or more could not be molded by hot stamping without cracking or wrinkling in one process.

Method used

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  • Hot stamping molded article and method and device for manufacturing hot stamping molded article
  • Hot stamping molded article and method and device for manufacturing hot stamping molded article
  • Hot stamping molded article and method and device for manufacturing hot stamping molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0105] Hereinafter, the hot stamping molded article, its manufacturing method, and the manufacturing apparatus according to the present embodiment will be sequentially described with reference to the drawings. In the following description, the case where the hot stamping molded product is the A-pillar lower outer panel is taken as an example, but the invention of the present application is not limited to the A-pillar lower outer panel, for example, it can also be applied to the front side rail in the same way.

[0106] The front side member has a portion bent in an S shape at a curved portion that rises from under the floor to the partition and protrudes forward. The part of the front side member that is joined to the floor and the partition has a flange, and the curved part protruding forward does not have a flange.

[0107] (1-1) Hot stamping molded products

[0108] The hot stamping molded product according to this embodiment has at least one of a tensile strength of 1200 MPa or ...

Embodiment approach 2

[0206] Next, other embodiments of the manufacturing apparatus and manufacturing method of the hot stamping molded article according to the present invention will be described.

[0207] The hot stamping molded product manufactured by the manufacturing apparatus and manufacturing method of the second embodiment may have the same configuration as the hot stamping molded product according to the first embodiment. The following Embodiment 2 is the same as the aforementioned Embodiment 1 except for the configuration described below.

[0208] (2-1) Manufacturing equipment

[0209] In the manufacturing apparatus 30 of the first embodiment, the holder working surface 32a of the blank holder 32 and the blank 40 and the die working surface of the die 33 and the blank 40 are both flat horizontal surfaces.

[0210] Such as Picture 20 As shown, as the molding progresses, the deformation behavior of the restriction portion 40-1 restricted by the holder working surface 32a and the die working surfac...

experiment example 1

[0245] The rigidity and crash characteristics of hot stamping molded products were evaluated by CAE (ComputerAided Engineering). Using the general FEM code L: S-DYNAver971, collision analysis and rigidity analysis were performed.

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Abstract

Provided is a steel hot stamping molded article having: at least one of a tensile strength of 1200 MPa or higher and a martensitic steel structure; and a first part, a corner, and a second part whichare sequentially contiguous from one end to the other end in a longitudinal direction, wherein the hot stamping molded article is characterized in that, in a cross-section view perpendicular to the longitudinal direction, each of the first part, the corner, and the second part has a top plate, and two vertical walls which are connected to the top plate, in that the second part has a first outwardflange which is adjacent to the vertical walls, and in that the corner has a vertical flange which extends from the vertical walls of the first part, a second outward flange which is adjacent to one of the two vertical walls located on the outer peripheral side of the corner, and a transition part to which the vertical flange and the second outward flange are contiguous.

Description

Technical field [0001] The invention of the present application relates to a hot stamping molded product, its manufacturing method, and a manufacturing device. Background technique [0002] In order to improve the fuel consumption rate due to the weight reduction of the automobile body and the collision safety of the automobile body, the steel plate constituting the automobile body is being strengthened. [0003] Figure 36 It is a perspective view showing an example of the A-pillar lower outer panel 1 which is a component of the body side of the body of an automobile. Such as Figure 36 As shown, the lower outer panel 1 of the A-pillar has a corner 2 on its upper part. The corner portion 2 has a vertical wall 3 perpendicular to the front-rear direction of the vehicle and a vertical wall 4 substantially perpendicular to the vertical direction of the vehicle. [0004] On the edge of the vertical wall 3 perpendicular to the front-rear direction of the vehicle, an outward flange 3a for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/20B21D24/04B62D25/04
CPCB62D25/04B21D22/22B21D53/88B21D22/21B21D22/022B21D22/208B21D22/26B21D24/04B62D29/007
Inventor 大塚研一郎忍田良之中泽嘉明
Owner NIPPON STEEL CORP