Ceramic-Metal Composite Beam for CMM Stiffness and Machinability
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Solution Overview
Problem
Existing beam elements for coordinate measuring machines face challenges in achieving a balance between structural stiffness, light weight, and machinability, as they need to minimize elastic deformations and dynamic stresses while allowing for necessary machining operations.
Innovation Solution
A process involving a ceramic substrate coated with a machinable metal material, specifically a silicon carbide bound to silicon nitride substrate coated with an aluminium alloy via spray metallizing, followed by impregnation and surface treatments to enhance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam elements are made with high structural stiffness to minimize elastic deformations, then measurement precision is improved, but weight increases causing higher dynamic stresses
Solution Approach 1:
The beam element is constructed as a composite structure with a ceramic core (providing stiffness) and a metal coating layer (providing machinability and reducing weight). This composite approach allows simultaneous achievement of high structural stiffness for measurement precision and reduced weight for lower dynamic stresses.
2Measurement precision
If beam elements are made with high structural stiffness to minimize elastic deformations, then measurement precision is improved, but machinability deteriorates
Solution Approach 1:
The beam element has different material properties in different regions: the ceramic core provides stiffness for measurement precision, while the metal coating layer provides machinability for manufacturing operations. This local differentiation of material properties resolves the contradiction between stiffness and machinability.
Solution Approach 2:
The composite structure combines ceramic material (stiff but difficult to machine) with metal coating (easier to machine). The metal layer serves as a sacrificial or functional coating that can be machined while the ceramic core maintains the required structural stiffness.
3Ease of operation
If beam elements are made light to reduce dynamic stresses, then ease of operation is improved, but structural stiffness deteriorates causing increased elastic deformations
Solution Approach 1:
The composite beam element achieves optimal weight-stiffness balance by combining lightweight ceramic core material with metal coating. The ceramic provides high stiffness-to-weight ratio, enabling light construction for ease of operation while maintaining measurement precision through adequate structural stiffness.
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 resulting beam elements exhibit extreme lightness, high structural stiffness, and improved machinability, effectively addressing the requirements for coordinate measuring machines.
Implementation Method 1
a metal material which is applied, for example, by spray metallizing or hot dipping onto the substrate
Data Source
Figure 1~4
Figure 2~3
AI summary
A process for producing a beam element (14) of a co-ordinate measuring machine (1), comprising the steps of applying a machinable metal coating (18) by spraying on a structural substrate (17) made of ceramic material, impregnating the coating (17) with a resin, and executing on the coating (17) a surface-finishing machining operation and a treatment of surface hardening.