Radiation-Cured Retention Features for Fixtureless Node Assembly
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Solution Overview
Problem
Robotic assembly of vehicle structures requires numerous fixtures, which are costly and specific to each part, limiting flexibility and increasing costs.
Innovation Solution
A fixtureless assembly system using robots with end effectors to directly engage and retain structures, combined with quick-cure adhesives that cure faster under EM radiation, allowing structures to be joined without fixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixtures are used to retain structural components during robotic assembly, then the components can be securely held and positioned, but the cost increases due to the large number of part-specific fixtures required
Solution Approach 1:
The patent applies universality by designing a single multi-functional end effector that can retain multiple different structural components without requiring separate fixtures for each part. The end effector incorporates adjustable retention members and positioning features that can adapt to various component geometries, allowing one device to perform the function previously requiring many dedicated fixtures.
Solution Approach 2:
The patent replaces the traditional mechanical fixture system with a robotic end effector system. Instead of using fixed mechanical fixtures mounted on assembly equipment, the invention uses programmable robotic manipulators with configurable end effectors that can dynamically adjust their retention and positioning capabilities through controlled movement and reconfiguration of retention members.
2Manufacturing precision
If numerous part-specific fixtures are used for robotic assembly, then each component can be precisely positioned, but the flexibility of the assembly system decreases
Solution Approach 1:
The patent applies dynamics by using a robotic end effector system that can dynamically reconfigure its retention and positioning capabilities. The end effector incorporates movable retention members and adjustable positioning features that can be repositioned in real-time to accommodate different component geometries and assembly requirements, providing both precision and adaptability.
Solution Approach 2:
The patent applies parameter changes by utilizing a programmable robotic system where the end effector's retention and positioning parameters can be modified through software control. By changing the programmed parameters and reconfiguring the physical retention members, the same end effector can precisely position different types of structural components without requiring physical retooling.
3Strength
If traditional adhesive curing methods (time or heating) are used, then the adhesive bonds structural components, but the assembly process becomes time-consuming
Solution Approach 1:
The patent applies phase transitions by using UV-curable adhesive that undergoes a rapid chemical phase transition when exposed to ultraviolet light. The adhesive remains in a liquid state during application and positioning, then quickly transitions to a cured solid state upon UV irradiation, providing rapid bonding without requiring extended time or thermal heating.
Solution Approach 2:
The patent replaces traditional thermal or time-based curing methods with UV light curing. Instead of using heat transfer or prolonged chemical reaction time, the invention employs electromagnetic radiation (UV light) to initiate and accelerate the curing process, dramatically reducing the time required to achieve adequate bond strength.
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 efficient, cost-effective assembly of vehicle structures without the need for part-specific fixtures, improving assembly flexibility and reducing costs.
Implementation Method 1
the at least one adhesive cures at a second rate faster than the first rate upon exposure to the EM radiation
Data Source
AI summary
Retention features are provided for joining at least two structural components in a fixtureless assembly system. A first structure including a groove may be configured to contain at least one adhesive, and a second structure may include a tongue configured to contact the at least one adhesive to join the first and second structures. The first structure may also include at least one window that receives electromagnetic (EM) radiation from an EM radiation source into the groove. The at least one adhesive is configured to cure at a first rate upon exposure to one of time or heating, and the at least one adhesive is configured to cure at a second rate faster than the first rate upon exposure to the EM radiation.