Press Device Provisional Compression Fluid Pressure
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Solution Overview
Problem
Conventional press devices face challenges in generating sufficient pressing force when dealing with large surface areas, as increased resistance from the workpiece reduces the pressing force due to Pascal's Principle, leading to inadequate pressing force generation, especially with materials of high rigidity.
Innovation Solution
A press device utilizing a press plate with an elastic packing ring and a provisional pressing unit that applies a provisional pressing force, followed by a suppression unit to restrict movement and generate a main pressing force using a pressurized fluid, effectively managing resistance and maintaining fluid pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the press surface area is increased to handle large surface area works, then the coverage area is improved, but the pressing force decreases due to increased resistance from the workpiece
Solution Approach 1:
The patent applies preliminary action by using a provisional pressing unit to pre-compress the workpiece before the main pressing operation. This preliminary compression reduces the workpiece's resistance to subsequent pressing, allowing the press device to maintain sufficient pressing force even when operating with a large press surface area. The provisional pressing unit performs the preparatory action of compressing the workpiece, which then facilitates the main pressing operation.
2Area of stationary object
If the press surface area is increased, then the coverage area is improved, but the fluid pressure is reduced according to Pascal's Principle
Solution Approach 1:
The provisional pressing unit performs preliminary compression of the workpiece, reducing its volume and resistance before the main pressing operation. This preliminary action ensures that when the pressurized fluid is introduced into the chamber, the reduced resistance allows the fluid pressure to be effectively transmitted across the large press surface area without significant pressure loss.
3Area of stationary object
If the press surface area is increased, then the coverage area is improved, but the energy consumption increases
Solution Approach 1:
The provisional pressing unit performs preliminary compression using minimal energy, reducing the workpiece volume and resistance before the main pressing operation. This preliminary action significantly reduces the energy required for the subsequent main pressing, as the workpiece is already partially compressed and offers less resistance. The energy-consuming main pressing operation thus requires less energy input when the provisional pressing has been applied.
Solution Approach 2:
The pressing operation is segmented into two distinct phases: a preliminary pressing phase using the provisional pressing unit, and a main pressing phase using the pressurized fluid. This segmentation allows the system to perform the high-energy main pressing operation more efficiently by first reducing the workpiece resistance through the low-energy preliminary pressing phase.
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 solution enables the generation of a sufficient pressing force on large surface areas without reducing fluid pressure, ensuring effective pressing even with rigid materials, while minimizing stroke and energy consumption, thus improving safety and efficiency.
Implementation Method 1
a chamber configured to generate a main pressing force to the work W placed on the press surface 111 by introducing a pressurized fluid FL into the chamber
Implementation Method 2
an elastic packing 130 formed in a ring shape as viewed in a plan view and disposed between the press plate 110 and the chamber base body 120... in a state where the elastic packing 130 is deformed by compression
Data Source
AI summary
A press device includes: a press head having: a press plate, a chamber base body and an elastic packing; and a provisional pressing unit having: a provisional pressing plate which transmits a provisional pressing force, and a provisional pressing force applying mechanism which gives a provisional pressing force to the provisional pressing plate. A main pressing force is generated to a work placed on a press surface by introducing a pressurized fluid into a chamber from a pressurized fluid source in a state where the elastic packing is deformed by compression by a provisional pressing force. The press device further includes a suppression unit which restricts the displacement of the provisional pressing plate in a counter provisional pressing direction by suppressing the movement of the provisional pressing plate in the counter provisional pressing direction.