Hydrostatic Flow Control With Film-Sheet Pressure Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional hydrostatic support systems face challenges in maintaining high oil film rigidity when load changes occur, leading to motion errors in precision machine tools.
Innovation Solution
A flow control method for a high-accuracy and high-stiffness hydrostatic device, which includes a main body and an auxiliary body with specific oil channels, throttling holes, and a film sheet to regulate oil flow and maintain pressure stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional throttle or multi-head pump is used for oil supply, then the structure is simple, but the oil film rigidity deteriorates when load changes occur
Solution Approach 1:
The patent employs a flexible membrane that dynamically adjusts the support gap in response to load changes. When load increases, the membrane deflects to maintain optimal gap size, thereby preserving oil film rigidity. This dynamic adaptation resolves the contradiction by making the system responsive to operating conditions rather than static.
Solution Approach 2:
The invention changes the physical state and properties of the oil supply system by introducing a compliant membrane element. This allows the support gap parameter to vary automatically with load, transforming the system from a fixed-geometry configuration to one where key parameters adapt to maintain performance.
2Manufacturing precision
If support gap is reduced to improve rigidity, then motion accuracy improves, but the system becomes sensitive to load variations
Solution Approach 1:
The flexible membrane creates a dynamic support gap that automatically adjusts to load variations. This eliminates the trade-off between small gap (for accuracy) and load sensitivity, as the gap size becomes a function of applied load rather than a fixed design parameter.
Solution Approach 2:
The membrane-based mechanism is self-regulating, requiring no external control systems. The membrane automatically adjusts the support gap in response to load changes, enabling the system to maintain optimal performance across varying operating conditions without external intervention.
3Device complexity
If constant pressure oil supply is used, then the control system is simple, but the film thickness changes with load
Solution Approach 1:
The invention transforms the constant pressure supply into a variable gap system through the compliant membrane. The membrane's deflection under load automatically compensates for pressure variations, maintaining stable film thickness without requiring complex active control mechanisms.
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 method achieves high oil film rigidity, minimizing film thickness changes under varying load pressures, thus ensuring high motion accuracy and reducing costs and complexity.
Implementation Method 1
the film sheet is predeformed under the pressure effect of the main body and the auxiliary body to form the regulating cavity
Implementation Method 2
Hydraulic oil enters the flow controller formed by matching the main body and the auxiliary body from the oil inlet hole with pump pressure
Implementation Method 3
the end of the first flow channel is provided with more than one first throttling hole, and the first throttling hole is communicated with the pressure stabilizing cavity, so that the oil enters the pressure stabilizing cavity from the first flow channel
Implementation Method 4
The better the oil film rigidity is, the less the film thickness change is when the load changes and the smaller the motion errors of the corresponding guides and rotary elements will be
Data Source
AI summary
The present invention relates to a flow control method for a high-accuracy and high-stiffness hydrostatic device, comprising: a main body and an auxiliary body; the upper surface of the main body forms a first flow channel, and a lug boss is formed on the first flow channel; the upper surface of the main body forms a second flow channel; the middle of the main body is concave down to form a pressure stabilizing cavity; the end of the first flow channel is provided with first throttling holes; the second flow channel is provided with a main oil hole; the first flow channel is provided with an oil distribution channel; the lug boss is provided with a second throttling hole; a bump matched with a bearing platform is formed on the bottom of the auxiliary body; a film sheet is arranged between the bump and the bearing platform; and the surface of the bump is provided with a groove. The present invention can complete flow control by a mechanical mode without any control module, and the oil film rigidity is high, which greatly reduces the use cost and improves the use reliability. The present invention has extremely high practicability. The present invention can be applied to relevant devices that need to apply flow control.