Automobile Body Sheet Bending Tests With Fixed Camera Imaging
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Solution Overview
Problem
Conventional bending tests for metal sheet materials in automobile bodies face challenges in accurately photographing the strain state of the bending outside surface without the camera going out of focus, particularly when using the VDA 238-100 standard, which also struggles with securing luminosity and field of view.
Innovation Solution
A bending test facility and method that includes a supporting member, a punch, and a camera with a fixed relative positional relationship to perform the bending test, allowing the camera to photograph the bending outside surface from the side of the supporting member, ensuring clear imaging during the test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a camera is used to photograph the bending outside surface during a conventional bending test, then the strain state can be captured, but the camera goes out of focus and cannot secure proper luminosity and field of view
Solution Approach 1:
A transparent plate is introduced as an intermediary medium between the punch and the camera. The camera photographs the bending outside surface through this transparent plate, which maintains a stable optical path and ensures consistent focus throughout the bending test. The transparent plate acts as a mediator that allows optical access to the measurement area without interfering with the bending process or causing focus instability.
2Measurement precision
If the VDA 238-100 bending test method is used with two rollers, then the limit bending radius can be evaluated, but the camera cannot secure sufficient luminosity and field of view through the gap between rollers
Solution Approach 1:
The transparent plate serves as an intermediary that replaces the need to view through the roller gap. By placing the transparent plate in the bending area, the camera can photograph the sample surface with adequate luminosity and field of view through the plate, rather than attempting to capture images through the constrained roller gap in conventional setups.
Data Source
AI summary
A strain state of a bending outside surface of a test specimen is photographed by use of a camera without falling out of focus during a bending test. A bending test facility for a metal sheet material for an automobile body includes a supporting member that supports two supported portions of a flat test specimen formed of the metal sheet material for an automobile body, a punch for performing a bending test in which an area between the two supported portions of the test specimen is pressed from an opposite side to the supporting member so that the test specimen is bent to be deformed, and a camera for photographing, from the side of the supporting member, a bending outside surface of the test specimen during the bending test using the punch, with relative positions of the punch and the camera during the bending test being fixed.