Hydrostatic Pressure Guide Mechanism for Machine Tool Load Handling
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Solution Overview
Problem
Existing machine tools with hydrostatic pressure guide mechanisms face challenges in adjusting static pressure oil supply based on workpiece weight, leading to inconsistent load handling and performance, particularly due to the need for pre-measurement of workpiece weight and complexity in managing oil supply and recovery.
Innovation Solution
A control system that includes a constant acceleration motion unit, workpiece-weight estimation unit, and supply state adjusting unit to dynamically adjust the static pressure oil supply based on estimated workpiece weight, ensuring suitable pressure settings regardless of workpiece weight changes during machining, and incorporating a hydrostatic-pressure combined sliding guide mechanism for balanced load handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hydrostatic pressure guide mechanism is used to reduce friction and enhance load capacity, then the guiding accuracy and load handling are improved, but the damping performance is limited and the device complexity increases due to supply and recovery devices
Solution Approach 1:
The patent combines a sliding guide mechanism and a hydrostatic pressure guide mechanism into a single integrated guide mechanism. The sliding guide portion handles damping and low-speed support, while the hydrostatic pressure guide portion provides high-load capacity and low-friction guidance during motion, eliminating the need for separate supply and recovery devices
Solution Approach 2:
The guide mechanism uses its own structure to provide both sliding and hydrostatic functions without external supply and recovery systems. The hydrostatic pressure is generated internally during motion, and the sliding surfaces provide automatic damping, making the system self-sufficient
2Strength
If the supply pressure of static pressure oil is increased to enhance load handling, then the load capacity is improved, but the damping performance deteriorates and oil discharge increases
Solution Approach 1:
The guide mechanism dynamically switches between sliding and hydrostatic modes based on motion state. During stationary or low-speed conditions, the sliding guide portion engages to provide damping and minimize oil discharge. During high-speed motion, the hydrostatic pressure guide portion activates to handle high loads with reduced friction
Solution Approach 2:
Different portions of the guide mechanism have specialized functions: the sliding guide portion provides damping and handles low-speed conditions, while the hydrostatic pressure guide portion provides low-friction guidance during high-speed motion. Each portion optimizes performance for its specific operating condition
3Device complexity
If a typical sliding guide mechanism is used to simplify device structure, then the device complexity is reduced, but the load capacity is limited and friction is high
Solution Approach 1:
The patent merges a sliding guide mechanism and a hydrostatic pressure guide mechanism into a single integrated structure. The sliding guide portion provides structural simplicity and damping, while the hydrostatic pressure guide portion enhances load capacity and reduces friction during motion, achieving both simplicity and high performance
4Object-generated harmful factors
If the supply pressure of static pressure oil is decreased to reduce oil discharge, then the harmful factors are reduced, but the load handling capability deteriorates
Solution Approach 1:
The guide mechanism dynamically adapts its load support method based on motion state. During stationary or low-speed conditions, the sliding guide portion supports the load through direct contact. During high-speed motion, the hydrostatic pressure guide portion activates to support high loads with minimal oil discharge, as oil is only supplied during motion when discharge is inevitable
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
This solution allows for efficient and accurate adjustment of static pressure oil supply, enhancing guiding accuracy and damping performance by adapting to changing workpiece weights without the need for pre-measurement, simplifying the machining process and improving work efficiency.
Implementation Method 1
a static pressure oil is supplied into the static pressure chamber, and a load is transmitted to the other of the slide surfaces by the static pressure
Implementation Method 2
only the static pressure oil intervenes between the pair of slide surfaces, so that the pair of slide surfaces are in non-contact with each other with a significantly reduced slide resistance
Implementation Method 3
a workpiece-weight estimation unit configured to estimate a weight of the workpiece from an operation state of the driving mechanism during the constant acceleration motion
Implementation Method 4
a supply state adjusting unit configured to adjust the supply state of the static pressure oil controlled by the control system depending on the weight of the workpiece estimated by the workpiece-weight estimation unit
Data Source
AI summary
A control system of a machine tool includes a hydraulic pressure adjuster. The hydraulic pressure adjuster includes a sequence program controller that includes components for adding a function of adjusting a hydrostatic pressure of a static pressure oil supplied to a hydrostatic pressure guide mechanism, which are a pressure setting unit, a constant acceleration motion controller, a workpiece-weight calculator and a supply state adjuster.