Hydroforming Apparatus with Contact Sensors for Load Path Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydroforming processes face challenges in finding a suitable load path due to the complexity of controlling internal pressure and axial pushing action, often requiring extensive trial and error and skilled labor, leading to defects like cracking and buckling.
Innovation Solution
A hydroforming apparatus and method utilizing contact sensors to control axial pushing action and internal pressure by detecting contact with the metal tube, allowing for a controlled sequence of steps to ensure uniform expansion without buckling or wrinkles, including maintaining constant internal pressure, stopping axial pushing when sensors detect contact, raising pressure, and lowering it when necessary, until all sensors indicate contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydroforming control methods are used, then hydroforming can be performed, but finding a suitable load path requires extensive trial and error and skilled labor
Solution Approach 1:
The patent employs sensors to detect the actual position and state of the metal tube during hydroforming, feeding this information back to the control system. This real-time feedback enables automatic adjustment of the load path, eliminating the need for extensive trial and error and skilled labor while ensuring reliable hydroforming results.
Solution Approach 2:
The patent replaces manual mechanical control methods with an automated control system that uses sensors, actuators, and computer algorithms to manage the hydroforming process. This substitution transforms the complex mechanical control into an automated system that can precisely execute optimized load paths without requiring skilled operators.
2Manufacturing precision
If multiple parameters (internal pressure and axial pushing action) are controlled simultaneously, then hydroforming can be performed, but the number of parameters increases making load path determination extremely complicated
Solution Approach 1:
The patent segments the control of multiple parameters into separate, independently controllable components. Sensors detect the state of the metal tube, and the control system adjusts internal pressure and axial pushing action as separate controlled variables based on real-time feedback, rather than attempting to control them as a single complex parameter set.
Solution Approach 2:
The patent dynamically changes control parameters based on real-time sensor feedback. The control system continuously adjusts internal pressure and axial pushing action parameters according to the actual forming state, enabling precise control while simplifying operation through automated parameter optimization rather than manual determination.
3Manufacturing precision
If broken line load paths are used, then forming accuracy can be improved, but the number of parameters increases tremendously requiring tremendous labor
Solution Approach 1:
The patent performs preliminary optimization of the load path using computational methods and sensor data before actual hydroforming. The control system pre-calculates the optimal broken line load path parameters based on the specific workpiece geometry and material properties, so that during actual forming, the system only needs to execute the pre-determined path with minimal adjustments, significantly reducing time consumption.
Solution Approach 2:
The patent uses computational models and simulations to create virtual copies of the hydroforming process, allowing optimization of broken line load paths in the virtual environment before actual implementation. This copying approach enables precise determination of multiple parameters without requiring tremendous labor in physical trial and error experiments.
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
Simplifies the process of finding a suitable load path, reduces labor-intensive trial and error, and enables defect-free hydroforming by alternately expanding end and center parts, making it easier to apply hydroforming to complex shapes and reducing the risk of buckling or wrinkles.
Implementation Method 1
contact sensors able to judge contact with the metal tube are mounted at least at two different positions in the tube axial direction
Implementation Method 2
applying internal pressure in the tube and a pushing action in the tube axial direction to form the tube into a predetermined shape
Implementation Method 3
axial pushing means...applying...a pushing action in the tube axial direction
Data Source
AI summary
A hydroforming apparatus and working method able to simply find a load path are proposed, which system and method use a mold in which contact sensors able to judge contact with a metal tube inside the mold are mounted at least at two different positions in the tube axial direction, perform a first step of axially pushing tube ends in a state with the internal pressure held at a constant value and stopping the progress of the axial pushing action when judging that among the contact sensors not yet in contact mounted at positions closest to the tube ends detect contact with the metal tube, next perform a second step of raising only the internal pressure while leaving the positions of the tube ends fixed and stopping the increase in the internal pressure when the contact sensor not yet in contact judges contact, next perform a third step of lowering the internal pressure to the value before raising it while leaving the positions of the tube ends fixed, and repeat said first step to third step until all of said contact sensors judge contact so as to obtain a hydroformed part.