Hybrid Control Arm Structure for Weight and Rigidity Balance
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Solution Overview
Problem
Existing mechanical parts, such as those in the automotive and aeronautical industries, face challenges in achieving a balance between weight reduction and maintaining rigidity and strength while minimizing manufacturing costs, as traditional methods using metal or composite materials are either too costly or lack sufficient automation for efficient production.
Innovation Solution
A method involving the creation of a rigid framework with shaped rods and a moulded plastic matrix, where the rods are optimally oriented to enhance strength and rigidity, and the matrix ensures proper positioning and prevents buckling, allowing for automated manufacturing and reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal casting or forging is used to manufacture mechanical parts, then strength and rigidity are ensured, but weight is excessive and manufacturing cost is high
Solution Approach 1:
The patent uses a composite structure combining a metallic framework (providing strength and rigidity) with a plastic matrix material (providing weight reduction). This hybrid composite approach allows the part to achieve the mechanical properties of metal while significantly reducing weight, as the plastic matrix fills the spaces between framework elements and provides structural support without the full density of solid metal.
2Weight of moving object
If titanium alloys are used to lighten mechanical parts, then weight is reduced, but manufacturing cost becomes prohibitive
Solution Approach 1:
Instead of using expensive titanium alloy throughout the entire part, the patent applies metal framework elements strategically at locations requiring high strength and rigidity, while using cheaper plastic matrix material in other areas. This localized application of expensive material only where structurally necessary significantly reduces overall manufacturing cost while maintaining adequate performance.
Solution Approach 2:
The composite structure allows substitution of expensive titanium alloy with a combination of less expensive metals for the framework and plastic material for the matrix, achieving weight reduction without the prohibitive cost of full titanium construction.
3Weight of moving object
If composite material winding is used to manufacture mechanical parts, then weight is reduced, but manufacturing automation is difficult and costs remain high
Solution Approach 1:
The manufacturing process is segmented into distinct operations: framework fabrication (which can be automated with CNC bending), interface element attachment (which can be automated with welding or bonding), and plastic matrix molding (which can be automated with injection or compression molding). This segmentation enables each step to be independently optimized for automation, unlike continuous composite winding which is inherently more difficult to automate.
4Strength
If metal is used for mechanical parts, then strength and rigidity are ensured, but weight reduction is not achieved
Solution Approach 1:
The patent employs a composite material system where a metallic framework provides the necessary strength and rigidity characteristics, while a plastic matrix material provides structural support with significantly lower density. This composite approach achieves weight reduction while maintaining the mechanical performance required for connection and transmission parts.
Data Source
AI summary
A method for manufacturing a connection and/or transmission mechanical part disposed between two structures, which consists in carrying out the following successive operations:making a rigid framework, through operations of shaping at least one rod or the like, in order to replicate the volume shapes of the part and create, at determined locations, segments with shapes suited to optimise the strength and the rigidity of the part,incorporating into the framework at least one element suited to make an interface of the part with either one of the structures,moulding a plastic matrix around the framework.