CMM Bed Decoupling Granite Table from Metal Frame
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Solution Overview
Problem
Coordinate measuring machines using granite beds face issues such as deformation under heavy workpieces, leading to measurement errors, high cost, weight, and supply difficulties, as well as complex and costly base structures in existing solutions.
Innovation Solution
A bed design comprising a metal frame with a pourable workpiece table made of concrete, supported by an H-shaped or frame with cross-members, and constrained using anti-vibration supports to decouple deformations, allowing for a simpler, less costly, and faster setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a granite bed is used to support heavy workpieces, then the bed provides stable support, but the bed deforms under the weight causing measurement errors
Solution Approach 1:
The bed is divided into two independent parts: a metal frame structure that provides mechanical support and guides, and a granite workpiece table that supports the workpiece. This segmentation allows each component to perform its specific function without interfering with the other, preventing deformation transmission between the support structure and the measurement reference.
Solution Approach 2:
The granite workpiece table is extracted and separated from the metal frame structure. By removing the granite from direct contact with the metal frame, the deformation caused by heavy workpiece weight is isolated to the table itself and does not affect the metal frame's guide accuracy, thus maintaining measurement precision.
2Stability of the object's composition
If granite is used for the bed, then the bed provides stable support, but the cost and weight increase significantly
Solution Approach 1:
The bed is segmented into a metal frame structure and a separate granite workpiece table. The metal frame provides the primary structural support with lower weight compared to a full granite bed, while the granite table is only used where workpiece support is needed, reducing overall weight while maintaining stability.
Solution Approach 2:
Granite material is applied locally only to the workpiece table area where high stability and vibration damping are needed, rather than using granite for the entire bed structure. This localized application maintains structural stability at the critical interface while reducing the overall weight of the bed assembly.
3Stability of the object's composition
If granite is used for the bed, then the bed provides stable support, but the supply time and cost increase
Solution Approach 1:
The bed system is segmented into a metal frame that can be manufactured and assembled quickly, and a separate granite workpiece table. This allows the metal frame to be produced without waiting for granite processing, enabling parallel manufacturing processes that reduce overall supply time while maintaining the stability benefits of granite where needed.
4Measurement precision
If the granite bed is decoupled from the supporting structure, then deformation is reduced, but the base structure becomes complex and costly
Solution Approach 1:
The bed is segmented into a simple metal frame structure and a separate granite workpiece table, creating a natural decoupling interface. This segmentation achieves deformation reduction through simple separation rather than requiring complex decoupling mechanisms, base isolators, or sophisticated stress-distribution systems.
Solution Approach 2:
The granite workpiece table is extracted as a separate component from the metal frame, creating a simple physical separation that decouples deformations. This extraction approach achieves measurement precision improvement without introducing complex decoupling mechanisms, keeping the base structure relatively simple and cost-effective.
Data Source
AI summary
A bed for a measuring machine constituted by a frame provided with a pair of mutually parallel beams bearing guides for the mobile unit of the machine, and a workpiece table housed between the beams; the workpiece table and the frame are constrained to one another by constraint means that decouple the deformations thereof, and the frame comprises at least one cross-member connected to respective intermediate portions of the beams.