Sheet Metal Corner Trimming with Oblique Cutting and Bearing Support
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Solution Overview
Problem
Existing methods for forming corner regions from flat sheets, such as those used in sheet metal plates, often result in burring of free end faces and edges that are not all within a single plane perpendicular to the side walls, leading to imprecision in corner formation.
Innovation Solution
A method and apparatus that involve folding down side edges to form intersecting side walls with excess projections, placing these projections between cutting elements in an oblique relationship with guide surfaces, and displacing one cutting element against the other to separate the excess projection, allowing for adjustable angle and height adjustments to ensure precise trimming and alignment with the side walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cutting elements are used to separate the excess projection in the corner region, then the corner can be trimmed, but burring occurs on the free end faces of the side walls and the edge points are not within a single plane perpendicular to the side walls
Solution Approach 1:
The method performs preliminary folding of side edges to form side walls with excess projections before trimming. The bearing elements are positioned in advance to support the side walls during cutting, ensuring proper alignment and preventing burring before the cutting action occurs.
Solution Approach 2:
Bearing elements are introduced as intermediary components between the cutting elements and the workpiece. These bearing elements support the side walls during trimming, ensuring that the cutting action occurs on properly positioned material, which prevents burring and ensures edge points lie within a single plane perpendicular to the side walls.
2Measurement precision
If guide surfaces perpendicular to the formed corner side wall are used, then cutting edges can be aligned precisely, but the process still results in burring and edges not within a single plane
Solution Approach 1:
The invention adds a new dimensional aspect by introducing bearing elements that provide support in a direction perpendicular to both the guide surfaces and the cutting action. This additional dimensional support ensures that the material being cut remains properly positioned, achieving both cutting edge alignment and edge planarity simultaneously.
Solution Approach 2:
The bearing elements act as intermediaries that transfer and stabilize the positioning function from the guide surfaces to the actual cutting zone, ensuring that the alignment achieved through guide surfaces is maintained throughout the cutting process, thereby preventing burring and ensuring edge planarity.
Data Source
AI summary
A method and apparatus for forming and trimming an associated corner region formed from a flat plate. A die and a knife assembly includes a die that is movable in opposed reciprocating directions within a first plane. A support assembly for the corner region holds the corner region at oblique angle with respect to the plane.