Machine Tool Frame Fastening Layout for Rigidity and Vibration Control
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Solution Overview
Problem
Existing machine frames for machine tools face challenges in providing sufficient fixation in the X-direction for short machines and oversizing in the X-direction for long machines, leading to issues with part accuracy, resonance, and vibrations due to inadequate force transmission and rigidity.
Innovation Solution
A machine frame design featuring two longitudinal members and two transverse members with specifically positioned and geometrically optimized floor fastening units, including triangular cross-sectional geometry with angled panels and surface elements, to predominantly transmit forces and torques in the X and Y directions, enhancing rigidity and force transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple floor fastenings are attached to the frame in the X-direction, then fixation in the X-direction is improved, but the floor fastenings become oversized for long machines
Solution Approach 1:
The floor fastening system is segmented into two distinct types: first floor fastening units for X-direction forces and second floor fastening units for Y-direction forces. This segmentation allows each fastening type to be optimized for its specific function, preventing oversizing while maintaining reliability.
Solution Approach 2:
Different floor fastening units are applied at different locations with different geometries. The first floor fastening units are attached to longitudinal members for X-direction forces, while the second floor fastening units are attached to transverse members for Y-direction forces. This local differentiation ensures each fastening is appropriately sized for its specific loading condition.
2Ease of manufacture
If the machine frame uses conventional floor fastenings, then installation is simple, but part accuracy decreases due to insufficient rigidity and force transmission
Solution Approach 1:
The floor fastening units incorporate adjustable parameters including angle adjustment and position adjustment capabilities. This allows the fastenings to be optimized for both rigidity/force transmission and adaptability to foundation irregularities, thereby improving part accuracy while maintaining ease of installation through adjustment rather than complex custom fabrication.
3Strength
If the machine frame is designed for maximum rigidity, then force transmission is improved, but adaptability to uneven foundations decreases
Solution Approach 1:
The floor fastening units incorporate dynamic adjustment capabilities, allowing the rigid machine frame to adapt to uneven foundations. The angle adjustment and position adjustment features enable the fastenings to accommodate foundation irregularities while maintaining the rigid connection needed for effective force transmission, thus resolving the contradiction between rigidity and adaptability.
Data Source
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AI summary
A machine frame (100) for a machine tool and machine tool A machine frame (100) for a machine tool having - two longitudinal members (101) running in a first direction (X) and two transverse members (102) connecting the longitudinal members (101) and running in a second direction (Y) running transversely to the first direction (X), wherein the longitudinal members and transverse members (101, 102) define a machining space (103) for the machine tool (200), - at least two, preferably at least four, first floor fastening units (104) for the predominant transmission of forces in the first direction (X) into a foundation, wherein the first floor fastening units (104) are fastened to ends of the longitudinal members (101), and - at least two second floor fastening units (105) for the predominant transmission of forces in the second direction (Y) into a foundation, wherein the second floor fastening units (105) are fastened to at least one of the longitudinal members (101) in its central region, wherein one, preferably exactly one, longitudinal member (101) with the second floor fastening units (105) has a cross-sectional geometry for the predominant force transfer in the second direction (Y).