Trim Strip Edge Formation Using Segmented Bending Tools
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Solution Overview
Problem
Existing methods for producing trim strips in the automotive sector face challenges in achieving precise, small gap dimensions and sharp edges at transitions between vertically and horizontally extending edges, often resulting in unsatisfactory bending radii and surface quality.
Innovation Solution
A method involving a plate with a prepared contour that is bent over using a die and stamp to form a turned-over portion with a sharp edge, allowing for precise control of the angle and edge formation, which can produce trim strips with outer radii significantly smaller than the material thickness and improved surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional bending methods are used to form end portions of trim strips, then the trim strips can be produced with simple processes, but large bending radii are produced which are disadvantageous for gap dimensions and aesthetics
Solution Approach 1:
The bending process is divided into two distinct stages: first forming a preliminary bent shape with a stamp, then creating the final sharp edge with a countersink tool. This segmentation allows each tool to be optimized for its specific function, achieving small radii without requiring overly complex single-step equipment
Solution Approach 2:
The stamp performs a preliminary bending action to create a bent-over region before the countersink tool forms the final sharp edge. This preliminary shaping prepares the material in a controlled manner, enabling the subsequent tool to achieve the desired small radius more effectively
2Manufacturing precision
If large bending radii are produced at end portions, then the bending process is simpler, but the gap dimensions and aesthetic appearance are compromised
Solution Approach 1:
The bent-over region acts as an intermediary form between the flat end portion and the final sharp edge. This intermediate bent shape, created by the stamp, allows material to be gradually redirected, making the formation of small radii more manageable and precise while maintaining manufacturing feasibility
3Manufacturing precision
If precise gap dimensions are required at bent regions, then aesthetic and technical performance improve, but the bending process requires higher precision and complexity
Solution Approach 1:
The countersink tool applies localized pressure specifically at the outer edge of the bent-over region, where the sharp edge is most critical for gap precision. This localized action concentrates the precision requirement to a specific area rather than requiring the entire bending process to achieve high precision uniformly
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
This method enables the production of trim strips with sharp edges and small, uniform radii, enhancing aesthetic and technical performance by achieving radii up to 0.1 times the material thickness, improving surface quality, and allowing for precise gap dimensions.
Implementation Method 1
a displacement of plastically deformable metal material is carried out
Implementation Method 2
turning over the prepared contour in a bending operation
Data Source
AI summary
A method for producing a trim strip comprising an extended portion (20) and a bent portion (19) which has a sharp edge (21) comprising the following steps: i) providing a blank with a material thickness and a shaped end cap contour (27); ii) bending the cap contour (27); iii) forming a sharp edge (21) along the bent portion (19), wherein a punch (31) for the edge-forming process, comprising a side surface (33, 37) which is stepped so as to correspond substantially to the material thickness and which faces the die (30) and counter die (32), is guided along the side surfaces (52, 35) of the counter die (32) and die (30) such that the step (34) of the punch (31) engages with the marginal edge (56) and displaces the material of the folded portion (19) towards the edge portion (21), thereby forming a sharp edge.