Machine Tool Workpiece Holder Eccentricity Estimation
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Solution Overview
Problem
Current machine tools lack effective balancing solutions for parts with large masses, relying on empirical methods that are prone to errors due to the absence of specialized balancing machines for such heavy loads, leading to potential damage from centrifugal stresses.
Innovation Solution
A part holder system equipped with sensing means and a central processing unit to detect and indicate the position and height of the center of gravity of the load, using hydrostatic radial and axial bearings, and pressure transducers to calculate and display the necessary counterweights for precise balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If empirical balancing methods are used by technicians, then balancing can be performed without specialized equipment, but the accuracy and reliability of balancing is compromised due to human error and lack of precision
Solution Approach 1:
The patent replaces the empirical mechanical balancing method with an automated sensing and calculation system. Pressure transducers measure the functional parameter of bearing sliders, and a central processing unit automatically calculates eccentricity and determines counterweight specifications, eliminating human error and intuition-based balancing.
Solution Approach 2:
The part holder system performs self-diagnosis and self-balancing determination by using its own bearing sliders and pressure transducers to detect eccentricity. The system automatically processes the data and provides counterweight specifications without requiring external balancing equipment or expert technicians.
2Weight of moving object
If heavy parts with large mass are supported on the worktable, then machining of large components is enabled, but centrifugal stresses from eccentricity seriously damage the radial guide bearings within a short period
Solution Approach 1:
The patent implements preliminary detection and calculation of eccentricity before machining operations begin. The pressure transducers measure the functional parameter during setup, the central processing unit calculates the exact counterweight specifications, and counterweights are positioned in advance to eliminate eccentricity, preventing bearing damage before it occurs.
Solution Approach 2:
The system uses pressure transducers to continuously monitor the functional parameter of the bearing sliders and provides feedback to the central processing unit. This feedback loop enables real-time detection of eccentricity conditions and allows for precise calculation and adjustment of counterweights to maintain bearing reliability.
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
Enables precise and reliable balancing of heavy loads, reducing the risk of stress on machine tool components and improving machining accuracy by providing operators with accurate data for counterweight placement.
Implementation Method 1
an axial bearing (14) which supports the worktable (11) on the footing (13); a radial bearing (15), provided with hydrostatic radial sliders, which is adapted for the guided coupling of the worktable (11) with the footing (13)
Implementation Method 2
first sensing means (16), which are functionally connected to a chosen radial slider (17) of the radial bearing (15) and are adapted to detect a functional parameter which indicates the operation of the chosen radial slider (17), such as for example the operating pressure or the gap height
Data Source
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AI summary
A part holder (10), particularly for parts having a large mass to be machined in machine tools such as vertical lathes and the like, which comprises - a worktable (11) for supporting a part (12) to be machined, - a footing (13) for supporting the worktable (11), - at least one axial bearing (14) which is adapted to support the worktable (11) on the footing (13), - at least one radial bearing (15), provided with hydrostatic radial sliders, which is adapted for the guided coupling of the worktable (11) with the footing (13) so as to allow rotation about a rotation axis (A) of the worktable (11) on the footing (13), the rotation axis (A) being formed by the axis of the radial bearing (15), - first sensing means (16), which are functionally connected to at least one chosen radial slider (17) of the radial bearing (15) and are adapted to detect at least one functional parameter, which indicates the operation of the chosen radial slider ( 17), - a central processing unit (18), which is functionally connected to the first sensing means (16) in order to receive from them estimates of the functional parameter. The central processing unit (18) comprises means (19) for estimating the eccentricity of the centre of gravity axis (B) of a part (12) arranged on the worktable (11) with respect to the rotation axis (A), the estimation means (19) being adapted to process the values of the functional parameter detected by the sensing means (16), so as to obtain the value of the eccentricity (E).