Rotational Security Functional Element Sheet Metal Contact
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Solution Overview
Problem
Existing functional elements face difficulties in securely attaching to sheet metal parts, particularly thick or high-strength ones, as it is challenging to deform the sheet metal material to fill recesses and achieve effective security against rotation using conventional methods.
Innovation Solution
The introduction of local recesses with raised portions on the sheet metal contact surface, allowing for easier displacement of sheet metal material into adjacent recesses with moderate forces, ensuring a form-fitted engagement and enhanced security against rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to deform sheet metal material to fill recesses, then security against rotation is achieved, but it becomes increasingly difficult with thick or high-strength sheet metal parts
Solution Approach 1:
The invention applies local quality by providing raised portions at specific locations on the sheet metal contact surface. These raised portions create localized stress concentrations that facilitate material flow into adjacent recesses during pressing, making the process easier even for thick or high-strength sheet metal parts while ensuring reliable security against rotation.
2Reliability
If recesses are provided in the sheet metal contact surface to achieve security against rotation, then rotational security is improved, but the sheet metal material is difficult to deform to fully fill the recesses
Solution Approach 1:
The raised portions are pre-formed on the sheet metal contact surface before the pressing operation. During pressing, these raised portions automatically perform the preliminary action of displacing material toward the recesses, ensuring that the recesses become adequately filled without requiring excessive pressing forces or complex tooling.
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 approach facilitates a robust and reliable security against rotation by maximizing the form-fitted engagement between the functional element and the sheet metal part, even with thick or high-strength materials, while minimizing the risk of fatigue issues.
Implementation Method 1
the sheet metal material having a material recess adjacent to the sheet metal contact surface at the position of each raised portion of a feature providing security against rotation
Data Source
AI summary
A functional element having a shaft part and a head part has at least one feature providing security against rotation which is provided in the region of a sheet metal contact surface of the functional element. The functional element is characterized in that each feature providing security against rotation comprises a recess provided in the sheet metal contact surface of the functional element with a raised portion disposed at least substantially centrally in the recess or with a raised portion surrounding the recess. With this design the functional element can be straightforwardly be inserted in a thick sheet metal part or in a sheet metal part of higher strength and thus a security against rotation of high quality can be achieved.