Riveting Tool Stroke Limiting Mechanism
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Solution Overview
Problem
Existing riveting tools for blind rivet nuts and screws face challenges in ensuring consistent and repeatable setting processes, especially when using different mandrels, due to pressure-controlled settings which can lead to varying quality and require manual intervention.
Innovation Solution
A riveting tool design featuring a detachable drawing mandrel connected to a compression rod, a coupling element for releasable connection, and an adjustable stroke limiting element to determine the setting position, allowing for precise and repeatable setting operations across various mandrels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If pressure-controlled setting is used to terminate the setting stroke, then the setting process can be automated, but the quality of setting operations varies due to manual interruption and different operators
Solution Approach 1:
The patent replaces the hydraulic pressure-controlled termination system with a mechanical stroke-limiting element system. The stroke-limiting element physically limits the travel distance of the drive piston, ensuring that the setting stroke is terminated at a precise, pre-determined position rather than relying on pressure thresholds that can vary with manual intervention.
Solution Approach 2:
The patent changes the control parameter from hydraulic pressure to mechanical stroke length. By adjusting the position of the stroke-limiting element along the drive piston's path, the setting stroke length can be precisely controlled and reproduced, eliminating variability associated with pressure-based control and manual operation.
2Adaptability or versatility
If different mandrels are used for different blind rivet nuts and screws, then the tool can handle various rivet types, but the mandrel replacement process becomes complex and time-consuming
Solution Approach 1:
The patent segments the mandrel assembly into separable components: the mandrel itself and the pressure rod with coupling element. This allows the mandrel to be quickly detached from the pressure rod and replaced without removing the entire assembly from the tool, significantly reducing replacement time while maintaining versatility.
Solution Approach 2:
The patent replaces complex locking mechanisms with a simple coupling element system featuring a groove and retaining ring. This mechanical simplification allows for rapid mandrel changes by simply engaging or disengaging the coupling element, eliminating the need for complex fastening or unfastening procedures.
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
Enables consistent and repeatable setting processes with different mandrels, ensuring high precision and ease of use by allowing for precise adjustment and secure locking of the drawing mandrel, reducing manual errors and improving the quality of the connection between the rivet and component.
Implementation Method 1
The drive piston 3, which is adjustable within a cylinder section 5 of a housing 4 of the riveting tool 1 in the longitudinal axis direction of the drive piston 3. The adjustment of the drive piston 3 is effected by hydraulic pressure.
Implementation Method 2
The longitudinal axis direction of the lift piston coincides with its adjustment direction between the starting position and the end position. By displacing the stroke limiting element along this longitudinal axis, a mechanically adjustable stop for the drive piston is thus provided, which mechanically determines the setting position of the riveting tool.
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a riveting tool (1) for setting blind rivet nuts and/or blind rivet screws, comprising a drive piston (3) that is hydraulically adjustable from a starting position towards an end position and a draw mandrel (8) that can be detachably brought into operative connection with the drive piston (3) and is adjustable by the drive piston (3) between a rivet receiving position and a setting position. In order to provide a riveting tool (1) of the type mentioned above, with which consistent setting operations of rivets can be carried out with high repeatability, it is provided that the riveting tool (1) has an adjusting unit for determining the setting position of the draw mandrel (8), with a stroke limiting element that is adjustable in the longitudinal axis direction of the drive piston (3) and can be brought into engagement with the drive piston (3).