Self-Punching Joining Element for Thread-Safe Fastening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The placement of joining elements with external threads into components requires prepunching, which can damage the thread and involves complex alignment, necessitating two separate worksteps.
Innovation Solution
A self-punching joining element with a detachable punching element that protects the external thread during insertion, allowing the element to create its own passage without damaging the thread, using a punching apparatus and a punch die with a widening hole to secure the element in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the joining element is placed into the component without prepunching, then the external thread may be damaged during insertion
Solution Approach 1:
A punching element is introduced as an intermediary component that performs the punching function separately from the joining element. The punching element is attached to the joining element during transport but is designed to be separated after punching, thus protecting the external thread during insertion while enabling self-punching capability
Solution Approach 2:
The function of the joining element is segmented into two parts: the joining element itself (with external thread) and a separate punching element. This segmentation allows the punching function to be performed without involving the threaded portion, thereby protecting the thread from damage during the punching process
2Productivity
If the joining element is placed into the component without prepunching, then alignment complexity increases
Solution Approach 1:
The punching element enables the joining element to perform its own punching function (self-service) without requiring external alignment with a pre-prepared hole. The punching element creates the passage automatically during insertion, eliminating the need for precise alignment with a prepunched hole
3Strength
If the punching element is firmly attached to the shaft, then it cannot be separated after punching
Solution Approach 1:
The attachment between the punching element and the shaft is designed to be dynamic rather than static. The attachment provides sufficient strength during transport and punching operations, but allows for easy separation after punching by applying a specific force, enabling the punching element to be removed from the shaft
Data Source
AI summary
The invention relates to a joining element comprising a shaft to be placed into a component; a head provided at a first end of the shaft; and a punching element attached in a losable manner to a second end of the shaft remote from the head.