Riveting Device Universal Screw Head Engagement
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Solution Overview
Problem
Current riveting devices require dedicated mandrels that match specific thread specifications, limiting their versatility and causing manufacturing and logistical challenges due to the need for rare thread specifications, and are often restricted to using only hexagon socket head cap screws as mandrels.
Innovation Solution
A riveting device utilizing a push rod, hold ring, and outer guide sleeve to secure a screw, allowing operation irrespective of the size or shape of the screw head, with a driver that moves the inner guide sleeve, push rod, outer guide sleeve, hold ring, screw, and rivet nut jointly to fasten the rivet nut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dedicated mandrels are used to match specific thread specifications, then the riveting device can securely fasten the rivet nut, but the device lacks versatility and requires multiple mandrels for different thread specifications
Solution Approach 1:
The guide sleeve is designed with a universal structure that can accommodate different screw types (hexagon socket head cap screws, flange head cap screws, button head cap screws, etc.) through a single standardized interface. The fastening element with its specific geometry (conical surface, cylindrical surface, and annular flange) creates a universal engagement mechanism that works with various screw head shapes and sizes, eliminating the need for multiple dedicated mandrels.
Solution Approach 2:
The mandrel is segmented into separate functional components: the guide sleeve (outer component) and the fastening element (inner component). This segmentation allows the fastening element to be standardized while the guide sleeve can adapt to different screw types, enabling versatility without requiring complete mandrel replacement for different applications.
2Adaptability or versatility
If rare thread specification mandrels are mass-produced, then all thread specifications can be covered, but manufacturing and stock management become problematic due to low demand for rare specifications
Solution Approach 1:
The standardized fastening element design with specific geometric features (conical surface at 60 degrees, cylindrical surface, and annular flange) creates a universal interface that can engage with various screw types. This universality allows a single fastening element design to cover multiple thread specifications, eliminating the need to mass-produce rare-specification mandrels while maintaining comprehensive thread specification coverage.
Solution Approach 2:
The design allows the fastening element to be detached and replaced independently from the guide sleeve. When a different screw type is needed, only the fastening element needs to be changed, not the entire mandrel assembly. This reduces manufacturing burden by allowing standardized components to be reused across multiple applications.
3Extent of automation
If pneumatic riveting devices use hexagon socket head cap screws as mandrels, then automation is improved, but the device is restricted to only hexagon socket head cap screws and requires dedicated fastening elements for each screw type
Solution Approach 1:
The guide sleeve is designed with a universal outer structure that can accommodate different screw types through standardized interface features. The combination of the conical surface, cylindrical surface, and annular flange on the fastening element creates a universal engagement mechanism that works with various screw head shapes, enabling pneumatic automation to work with multiple screw types using a single guide sleeve design.
Solution Approach 2:
The fastening element incorporates dynamic geometric features (conical surface, cylindrical surface, and annular flange) that adapt to different screw head geometries. The conical surface at 60 degrees provides progressive engagement, while the cylindrical surface and annular flange accommodate different head shapes, allowing the same fastening element to dynamically adapt to various screw types during the pneumatic driving process.
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 the use of various screw types with different head sizes and shapes, reducing the need for multiple mandrels and simplifying the riveting process by securing the screw through mutual pushing and friction between metal components, thus overcoming the limitations of existing devices.
Implementation Method 1
securing the screw by the push rod, the hold ring and the outer guide sleeve... mutual pushing and friction between metal components
Data Source
AI summary
A riveting device comprises an inner guide sleeve having a push rod thereinside; an outer guide sleeve sleeving the inner guide sleeve; a hold ring disposed inside and tightly pressed against the outer guide sleeve; and a driver. The screw body of a screw is inserted through the outer guide sleeve and hold ring and screwed into a river nut. The screw head is disposed inside the inner guide sleeve and tightly pressed against the hold ring by the push rod. The driver is combined with the inner guide sleeve and drives the inner guide sleeve, push rod, outer guide sleeve, hold ring, screw and rivet nut to move jointly and rivet the rivet nut. The present invention is characterized in using the push rod, hold ring and outer guide sleeve to secure the screw and exemption from the limitation by the size or shape of the screw head.