Interference-Fit Gas Cushion for Higher Stable Cushion Force
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Solution Overview
Problem
Conventional gas cushions used in press processing and plate forging of high tensile strength materials often lack sufficient cushion force, leading to reduced rigidity and the need for multiple cushions, which can compromise performance and increase size, making them inefficient for high-strength applications.
Innovation Solution
A gas cushion device incorporating a cylinder and piston in an interference fit with a gas energizing mechanism and an oil feeding system, where the piston's diameter reduces from the inside to the outside, providing both gas and frictional forces to achieve higher cushion force while maintaining stability and reducing frictional heat through lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a gas cushion is used to provide cushion force, then space can be saved compared to coil springs, but the cushion force is insufficient for high tensile strength materials
Solution Approach 1:
The patent combines gas pressure force and friction force into a unified cushioning mechanism. The interference fit between piston and cylinder wall generates friction force that acts together with gas pressure to provide the required cushion force for high-strength materials, eliminating the need for multiple gas cushions or larger volume designs.
Solution Approach 2:
The patent changes the physical state of the piston-cylinder interface from a clearance fit to an interference fit. This parameter change transforms the mechanical interaction at the interface, generating friction force that supplements the gas cushion force, thereby achieving higher total cushion force within the same volume.
2Force
If multiple gas cushions are arranged to obtain desired cushion force, then the cushion force increases, but the rigidity of the die is reduced
Solution Approach 1:
The patent merges gas pressure force and friction force into a single cushioning system, achieving the desired total cushion force with one compact unit rather than multiple distributed cushions. This maintains die rigidity while providing sufficient cushion force for high-strength materials.
3Force
If a piston and cylinder are fitted in an interference fit state to generate friction force, then cushion force increases, but frictional heat is generated during sliding
Solution Approach 1:
The patent converts the harmful frictional heat generated during piston sliding into a beneficial cooling effect. By introducing a cooling mechanism that circulates coolant through the cylinder wall, the system uses the generated heat to drive the cooling process, preventing overheating while maintaining the friction-based cushion force.
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 device achieves a higher and more stable cushion force by combining gas and frictional forces, reducing the need for multiple cushions and minimizing the risk of workpiece cracking or breaking, while automatically returning the piston and eliminating the need for separate lubrication systems.
Implementation Method 1
a gas G enclosed in the cylinder 20 to energize the piston 30
Implementation Method 2
a frictional force (friction cushion force) due to the interference fit between the inner surface of the cylinder and the outer surface of the piston
Implementation Method 3
an oil feeding mechanism 11 for feeding a lubricating oil L to a fitting portion F1 between the cylinder 20 and the piston 30
Implementation Method 4
since the oil feeding mechanism is provided to feed a lubricating oil to the fitting portion, the fitting portion can be cooled, which prevents seizure and sticking
Data Source
AI summary
A gas cushion device includes a cylinder, a piston slidably fitted in the cylinder, a gas enclosed in the cylinder to energize the piston, and an oil feeding mechanism configured to feed a lubricating oil to a fitting portion between the cylinder and the piston. The cylinder and the piston are fitted in an interference fit state. The piston is reduced in diameter from an inside of the cylinder toward the outside of the cylinder.