Hat-Section Press Molding with Staged Compression Against Spring-Back
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Solution Overview
Problem
Conventional methods for manufacturing press-molded articles with a hat-shaped cross section fail to adequately prevent spring-back, leading to insufficient dimensional accuracy.
Innovation Solution
A method involving in-plane compression of a second bent plate body with a hat-shaped cross section between a first mold and a second mold, using a press-molding device with specific mechanisms to reduce spring-back and enhance dimensional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional single-step compression is used, then process simplicity is maintained, but dimensional accuracy of hat-shaped cross section is insufficient
Solution Approach 1:
The method employs periodic compression actions with two distinct stages. The first stage compresses vertical wall portions, and the second stage compresses flange portions. By applying compression periodically in controlled stages rather than simultaneously, the method effectively manages different spring-back behaviors at different locations of the hat-shaped cross section.
Solution Approach 2:
The compression process is divided into two distinct phases: first compressing the vertical wall portions between upper and lower molds to prevent spreading, then compressing the flange portions between upper and lower molds to prevent angle increase. This segmentation allows each phase to address specific spring-back issues independently, achieving comprehensive dimensional accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method and device achieve a press-molded article with a hat-shaped cross section that has significantly reduced spring-back and excellent dimensional accuracy, achieved in simple steps.
Implementation Method 1
spring-back that acts in such a way that the vertical wall portions spread away from each other
Implementation Method 2
a second bent plate body with a hat-shaped cross section is obtained by a first bent plate body with a hat-shaped cross section is in-plane compressed between a first mold and a second mold
Data Source
AI summary
The invention is a press-molding device which is configured to obtain a press-molded article with a hat-shaped cross section by compressing a preform with a hat-shaped cross section between a punch of a first mold and a die of a second mold. The press-molding device includes: a punch and a die forming a compression mechanism to compress a flange and a side wall of a hat-shape in the preform; a compression block forming a first pressing mechanism to press an outer end portion of the flange of the hat-shape in the preform; a pad forming a second pressing mechanism to press an upper end portion of the side wall of the hat-shape in the preform.