Steel Shape Measurement With Laser Absorber for Mirror Surfaces
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Solution Overview
Problem
Existing steel-shape measurement devices, particularly those with optical rangefinders, experience abnormal measurements when dealing with substantially mirror-shaped steel surfaces, and existing correction devices lack effective methods to address these issues, leading to inaccurate shape correction.
Innovation Solution
A steel-shape measurement device equipped with a laser rangefinder and a laser-beam absorber with 45°-0° diffuse reflectance of less than or equal to 10% is used to measure the shape of steel products, reducing the impact of secondary diffusely-reflected light and improving measurement accuracy, while a steel-shape correction device corrects the shape based on these measurements using a press and transport device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical rangefinders are used to measure steel plate surface, then continuous shape measurement is enabled, but abnormal measurements occur on substantially mirror-shaped surfaces
Solution Approach 1:
A laser-beam absorber is introduced as an intermediary component to intercept regularly-reflected laser beams from mirror surfaces. The absorber prevents these beams from reaching the optical rangefinder, thereby eliminating the source of measurement errors while allowing the measurement system to continue functioning
Solution Approach 2:
The harmful regularly-reflected light is extracted and removed from the measurement system by the laser-beam absorber. This separates the problematic reflection component from the measurement process, allowing accurate measurement of the actual surface shape without contamination from mirror reflections
2Measurement precision
If laser beams are emitted to scan steel plate surface, then off-line shape measurement is enabled, but secondary diffusely-reflected light causes measurement errors
Solution Approach 1:
The laser-beam absorber serves as a mediator that selectively intercepts regularly-reflected beams before they can generate secondary diffuse reflections. By positioning the absorber in the path of regular reflections, the system prevents the creation of harmful secondary reflections that would otherwise contaminate the measurement signal
Solution Approach 2:
The invention converts the potentially harmful regular reflection into a beneficial indicator by using it to determine where to place the laser-beam absorber. The regular reflection pattern itself guides the placement of the solution that eliminates measurement errors
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 solution enables reliable measurement and efficient correction of steel products with mirror-shaped surfaces, reducing abnormal measurements and ensuring accurate shape assessment and correction.
Implementation Method 1
detect the distance to the surface of the steel plate on the basis of the state of light reflection from the steel plate that passes by the measurement device
Implementation Method 2
a laser-beam absorber 8 that absorbs regularly-reflected laser beams from the steel product surface
Data Source
Figure 1(a)~1(d)
Figure 2
Figure 3(a)~3(b)
AI summary
Provided are a steel-shape measurement device that can reliably measure the shape of a steel product having a substantially mirror-shaped steel plate surface on a transport device before and after shape correction and the shape of the steel product under a pressing ram during shape correction, and a steel-shape correction device that can efficiently correct the shape using measurement results of the steel-shape measurement device. The steel-shape measurement device measures a distance to a detection spot group on a to-be-scanned surface of a steel product with a laser rangefinder 5A that measures the distance through scanning of a steel product S with a laser beam emitted from one laser light source 11 and redirected with a galvanometer mirror 13, and measures a shape of the steel product from obtained measured-distance data. The steel-shape measurement device includes an object having a 45°-0° diffuse reflectance of equal to or lower than 10% as a laser-beam absorber 8 at least one portion within an irradiation range irradiated with a regular-reflected laser beam from a to-be-scanned surface of the steel product.