Membrane Press Prestressing for Smooth Sealing and Uniform Pressure
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Solution Overview
Problem
Existing membrane presses face challenges in maintaining a smooth and sealed membrane surface during the manufacturing of fibre composite parts, especially when dealing with complex geometries and heat-induced expansions, which affect uniform pressure application.
Innovation Solution
The membrane is prestressed before applying pressure and temperature, with adjustable prestressing and sealing forces to ensure a smooth surface and reliable sealing, allowing for flexible adaptation to workpiece shapes and process conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the membrane is sealed with a seal that presses on the membrane with a sealing force, then reliable sealing is achieved, but the membrane surface may become uneven and pressure application becomes non-uniform
Solution Approach 1:
The membrane is prestressed in a preliminary step before the actual pressing operation. This preliminary action pre-tensions the membrane to compensate for the sealing force that will be applied during operation, ensuring the membrane surface remains smooth and pressure distribution remains uniform throughout the manufacturing process.
2Adaptability or versatility
If the membrane is made flexible to adapt to complex workpiece geometries, then adaptability is improved, but the membrane surface smoothness deteriorates during heat-induced expansion
Solution Approach 1:
The membrane is prestressed before the heating and pressing operations. This preliminary tensioning counteracts the thermal expansion and relaxation that occur during the manufacturing process, maintaining surface smoothness while preserving the ability to adapt to complex geometries.
Solution Approach 2:
The prestressing state of the membrane is established as a key parameter before operation. By controlling the membrane tension in advance, the system maintains surface smoothness during heat-induced expansion while preserving geometric adaptability for complex workpiece shapes.
3Reliability
If the sealing force is increased to ensure reliable sealing, then sealing reliability is improved, but the membrane mobility and adaptability deteriorate
Solution Approach 1:
The membrane is prestressed in advance to establish optimal tension. This preliminary action allows the sealing force to be applied during operation without restricting membrane mobility, as the membrane is already in the correct tension state to accommodate both sealing requirements and geometric adaptation.
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 ensures uniform pressure application and sealing, even in the presence of heat-induced expansions, enhancing the manufacturing process efficiency and quality of fibre composite parts.
Implementation Method 1
The cavity is sealed by at least one seal, which presses on the membrane with a sealing force
Implementation Method 2
applying pressure and/or temperature to the workpiece by means of the membrane
Implementation Method 3
a cavity for a working medium is formed between the membrane and the pressing tool connected to it
Data Source
AI summary
A method for pretensioning the membrane of a press, a) providing a press having a first pressing tool, a second pressing tool and a membrane, the first pressing tool and the second pressing tool are movable, the membrane connected to one of the pressing tools, a cavity for a working medium is formed between the membrane and the pressing tool, the cavity is sealed by at least one seal which presses onto the membrane with a sealing force; b) providing at least one workpiece including a matrix and fibres embedded therein; c) inserting the workpiece into the press; d) closing the press; e) subjecting the workpiece to pressure and/or to heat by means of the membrane, a cured shaped part is formed from the workpiece; and f) opening the press and removing the shaped part, which ensures a surface of the membrane is smooth.