Machine Tool Bed Support Layout to Limit Bending
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Solution Overview
Problem
The bed of a machine tool experiences slight bending due to changes in weight distribution caused by movable bodies, affecting processing accuracy.
Innovation Solution
The machine tool is configured with first and second movable bodies, each confined within specific triangles defined by the vertices of four jacks, and reinforced with ribs connecting opposing jacks to enhance stability and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If movable bodies are allowed to move freely on the bed, then the machine tool has high versatility and adaptability, but the bed experiences bending due to weight distribution changes, reducing manufacturing precision
Solution Approach 1:
The bed surface is divided into multiple triangular regions, with each triangle formed by three jacks. Each movable body is assigned to a specific triangular region, and its movement is confined within that region. This segmentation allows multiple movable bodies to operate simultaneously without interfering with each other, maintaining versatility while preventing bed bending through localized weight distribution.
Solution Approach 2:
Different triangular regions are assigned to different movable bodies based on their specific operational requirements. Each movable body operates within its designated triangular region, allowing local optimization of movement ranges while maintaining overall system stability. This local quality approach ensures that weight distribution changes are contained within specific regions rather than affecting the entire bed.
2Adaptability or versatility
If multiple movable bodies are provided on the bed, then the machine tool functionality is enhanced, but the weight distribution changes cause bed bending, affecting stability
Solution Approach 1:
The bed is segmented into multiple triangular regions using four jacks positioned at specific locations. Each triangular region can support a movable body independently. This segmentation allows multiple movable bodies to be accommodated simultaneously while each body's weight is distributed to a specific subset of jacks, preventing cumulative bending effects that would occur with unrestricted positioning.
Solution Approach 2:
The problem of weight distribution on a 2D bed surface is solved by introducing a triangular coordinate system defined by jack positions. By confining movable bodies to specific triangular regions, the system transforms the continuous 2D positioning problem into a discrete regional assignment problem, where each region has predefined stability characteristics.
3Stability of the object's composition
If the bed is supported by multiple jacks, then the support stability is improved, but the complexity of the supporting device increases
Solution Approach 1:
Instead of using a symmetric arrangement of jacks (such as four jacks at the corners of a square), the invention uses an asymmetric triangular arrangement where four jacks are positioned to form multiple overlapping triangular regions. This asymmetric configuration optimizes the distribution of support points to minimize bed bending while maintaining structural stability, and the triangular geometry naturally provides rigid support triangles.
Data Source
AI summary
A machine tool includes: a bed; first and second movable bodies supported so as to be movable with respect to the bed; and first to fourth jacks configured to support the bed. A moving range of a gravity center of the first movable body is confined within a first triangle in which three of the first to fourth jacks are at vertices thereof when the machine tool is viewed from the top. A moving range of a gravity center of the second movable body is confined within a second triangle in which three of the first to fourth jacks are at vertices thereof when the machine tool is viewed from the top. A combination of the three jacks forming the first triangle and a combination of the three jacks forming the second triangle differ from each other.