Feed Axis Thermal Displacement Compensation via Rapid Traverse Time Density
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Solution Overview
Problem
Existing machine tools face challenges in accurately compensating for thermal displacement of the feed axis system, leading to decreased processing precision and increased manufacturing costs due to the use of high-priced components like sensors, especially when operating at high speeds.
Innovation Solution
A device and method that calculate the average rapid traverse time density to compensate for thermal displacement in real-time, eliminating the need for expensive sensors by using a thermal displacement compensating device with a timer, rapid traverse time measuring unit, and control unit to adjust the feed axis system based on calculated thermal displacement rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the feed axis system is operated at high speed to reduce processing time and increase productivity, then productivity is improved, but thermal deformation occurs causing workpiece diameter change and decreased processing precision
Solution Approach 1:
The patent replaces expensive mechanical thermal displacement compensation mechanisms with a computational approach. The control unit calculates thermal displacement based on measured rapid traverse time and pre-stored compensation data, substituting complex sensor-based mechanical compensation systems with software-based calculation and adjustment methods.
Solution Approach 2:
The patent creates a virtual model of thermal displacement behavior by storing compensation data that represents the relationship between rapid traverse time density and thermal displacement. This virtual compensation model allows the system to predict and correct thermal effects without requiring physical sensors at every measurement point.
2Manufacturing precision
If temperature sensors are used to compensate for thermal displacement, then processing precision is improved, but manufacturing cost increases due to high-priced components
Solution Approach 1:
The patent uses a timer and standard measurement components instead of expensive temperature sensors. The system leverages the existing control unit's timing capabilities and pre-stored compensation data tables, replacing high-cost sensing hardware with low-cost computational methods using readily available components.
Solution Approach 2:
The system uses its own existing timing and control functions to measure rapid traverse time and calculate thermal displacement compensation. The control unit serves multiple functions including timing, data storage, and compensation calculation, eliminating the need for separate expensive thermal sensing and compensation subsystems.
3Manufacturing precision
If traditional thermal displacement compensation methods are used, then some precision is achieved, but the system cannot accurately compensate for rapidly operated feed axis systems and equipment cost increases
Solution Approach 1:
The patent segments the compensation process into distinct computational steps: measuring rapid traverse time, calculating time density, retrieving compensation data, and applying correction. The compensation data itself is segmented into multiple tables corresponding to different axis directions and movement types, allowing targeted and efficient compensation without complex unified models.
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 approach improves processing precision and reduces manufacturing costs by accurately compensating for thermal displacement in real-time, making it applicable to various machine tools and workpieces without the need for high-priced configurations.
Implementation Method 1
heat generated when the feed axis system is operated at a high speed
Implementation Method 2
thermal deformation of the feed axis system
Data Source
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AI summary
The aim of the present disclosure is to solve the above problem, and to provide a device and method for compensating thermal displacement of feed axis system of a machine tool, capable of obtaining rapid traverse time density by computing a time ratio used for rapid traverse per unit time, being used for exchanging tools or selecting the position of the tools as a working point; and comparing a current compensation value with a maximum value, which is calculated on the basis of an average value of the computed rapid traverse time density to compensate for the feed axis system according to the thermal displacement thereof, thereby being applied to a variety of workpieces and machine tools, promptly compensating for thermal displacement in the feed axis system according to the movement of the feed axis system, and reducing manufacturing costs.