Pressing Path Compensation for Accurate Ring-on-Shaft Assembly
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Solution Overview
Problem
Pressing processes face challenges in reproducibly adjusting the pressing path, particularly when pressing a component like a pressing ring onto another component, such as a shaft, due to varying pressing forces caused by component tolerances, surface properties, and environmental factors, leading to positioning errors that cannot be accurately corrected by constant factors.
Innovation Solution
A pressing process using a motor-driven press with integrated position and force measuring systems, which records data points for a force-displacement diagram to determine correction values for the pressing path, allowing for real-time adjustments and improved reproducibility by dividing the pressing process into sub-steps for precise error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant correction factors are used to adjust the pressing path, then the pressing process can be simplified, but positioning accuracy deteriorates due to varying pressing forces
Solution Approach 1:
The patent implements dynamic correction by continuously measuring the actual pressing path during the pressing process and adjusting the correction factor in real-time based on measured positioning errors. This transforms the static constant correction approach into a dynamic adaptive system that responds to actual process variations, thereby maintaining positioning accuracy without sacrificing operational simplicity
Solution Approach 2:
The patent employs a feedback mechanism where the actual pressing path is measured during the pressing process, the positioning error is calculated by comparing the actual path with the target path, and this error information is used to adjust the correction factor for subsequent pressing operations. This closed-loop feedback system eliminates positioning errors caused by varying pressing forces while keeping the control system manageable
2Reliability
If pressing forces are increased to overcome component tolerances and surface properties, then component assembly reliability improves, but positioning accuracy deteriorates due to elastic deformation
Solution Approach 1:
The patent replaces the purely mechanical pressing system with a hybrid system that incorporates optical or electromagnetic measurement technology to monitor the actual pressing path. This substitution allows for non-contact, high-precision measurement of positioning errors without interfering with the mechanical pressing forces, enabling simultaneous achievement of high reliability and high positioning accuracy
Solution Approach 2:
The patent changes the control parameter from a fixed pressing path to a dynamically adjusted pressing path based on real-time measurement feedback. By continuously monitoring the actual pressing path and adjusting the correction factor, the system adapts to elastic deformation caused by increased pressing forces, maintaining positioning accuracy while ensuring reliable component assembly
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 significantly reduces positioning errors by allowing for dynamic adjustments based on current environmental conditions and component properties, achieving high precision in the arrangement of components like a pressing ring on a shaft with defined axial play.
Implementation Method 1
The pressing forces when pressing components together cause different reaction forces, which affect the force-transmitting components of the press in the form of a force-dependent, usually elastic deformation or deflection that is subject to Hooke's law
Implementation Method 2
a position measuring system for the direct or indirect measurement of the position of the press ram or the quill
Data Source
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AI summary
A pressing process is provided for a press (100) with a lower tool (111) and a press ram driven by a motor (108) or a quill driven by a motor (108) (104) ...in which, while the components for which the data points were recorded are being pressed, an evaluation of the data points is carried out in order to determine at least one correction value for the pressing path, and in which, while the components for which the data points were recorded are being pressed, a correction of the pressing path for these components is carried out using at least one correction value obtained in this way, and a press (100) is used to carry out a process.