Bi-Material Cartesian Robot Link for Thermal Deflection Control
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Solution Overview
Problem
Multi-axis Cartesian robots in the plastics industry face challenges with aluminum links, which are flexible and costly, while steel links are difficult to produce with complex shapes and suffer from bimetallic deflection issues due to temperature gradients.
Innovation Solution
A bi-material link comprising a stiffening steel element and a guiding aluminum element, secured together with a deformation suppression element made of the same materials, eliminating relative movement and minimizing thermal expansion effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aluminum links are used in multi-axis Cartesian robots, then the links can be produced with complex shapes and integrated functions, but the links suffer from insufficient rigidity, high material costs, and reduced lifespan due to friction on bearing surfaces
Solution Approach 1:
The patent applies composite materials by combining aluminum and steel in a bi-material link structure. The aluminum component provides complex shaping and integration of technical functions, while the steel component provides the necessary rigidity and strength. This composite approach resolves the contradiction by allowing each material to contribute its advantageous properties in the same structural assembly.
Solution Approach 2:
The link is segmented into distinct aluminum and steel components rather than using a single homogeneous material. This segmentation allows the aluminum portion to be extruded into complex profiles with integrated functions, while the steel portion provides structural reinforcement, thereby resolving the contradiction between manufacturability of complex shapes and structural rigidity.
2Strength
If steel links are used to improve rigidity, then the links gain sufficient strength and durability, but producing profiles with complex functions becomes difficult or impossible
Solution Approach 1:
By using composite materials (aluminum and steel), the patent enables the aluminum component to be manufactured with complex extruded profiles and integrated functions, while the steel component ensures the necessary rigidity. This resolves the contradiction by assigning different manufacturing roles to different materials within the same link structure.
Solution Approach 2:
The link structure is segmented into an aluminum profile portion for complex shaping and a steel reinforcement portion for rigidity. This segmentation allows each material to be optimized for its specific function, with aluminum providing manufacturable complexity and steel providing structural strength.
3Quantity of substance
If bi-material assemblies are created combining aluminum and steel parts, then cost reduction is achieved, but significant and unacceptable deflection occurs under temperature gradient due to the bimetallic effect
Solution Approach 1:
The patent applies local quality by strategically positioning steel reinforcement elements at specific locations within the aluminum link structure where thermal expansion differences would cause the most significant deflection. This localized reinforcement minimizes the bimetallic effect while maintaining overall cost effectiveness, resolving the contradiction between material cost and thermal stability.
Solution Approach 2:
The bi-material composite structure is designed to leverage the complementary properties of aluminum (cost-effective, complex shaping) and steel (rigid, thermally stable). By carefully selecting material combinations and configurations, the patent achieves both cost reduction and minimized thermal deflection, resolving the contradiction between economy and stability.
4Quantity of substance
If aluminum links are used, then cost is reduced compared to steel, but the lifespan and reliability are considerably reduced due to friction on bearing surfaces
Solution Approach 1:
By combining aluminum and steel in a composite link structure, the patent achieves cost reduction from the aluminum component while the steel component provides enhanced durability and reduced friction on bearing surfaces. This composite approach resolves the contradiction between material cost and link lifespan by allowing each material to contribute its advantageous properties.
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
The solution provides a durable, cost-effective link that minimizes thermal deflection and maintains structural integrity, overcoming the limitations of aluminum and steel links while ensuring economic and technical gains.
Implementation Method 1
one or more portions of one of said elements undergoing expansion or contraction relative to at least one of the other contact elements when the temperature varies
Data Source
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AI summary
The invention relates to a Cartesian robot comprising at least one link (1, 1'). According to the invention, said link is made up of at least two elements made of two different materials and joined together: - a stiffening element (2, 2'), made from a folded sheet of steel; and - a retaining and/or guiding element (3, 3'), made from an extruded aluminum profile. The stiffening element (2, 2') and the retaining and/or guiding element (3, 3') are joined together by a fixed connection at constant temperature.In addition, the link (1, 1') also includes a deformation suppression or reduction element (4, 4') of said link in case of temperature variation, made in a first of said materials and extending parallel to said stiffening and holding and/or guiding elements, and is fixed by embedding to the element among these made in the second of said materials, so that the latter, or at least a surface of the latter, is placed between two elements made in the first material, one or more portions of one of said elements undergoing expansion or contraction relative to at least one of the other elements (2, 2', 3, 3', 4, 4') in contact when the temperature varies.