Piston Cavity Sleeve Geometry for High-Pressure Press Fatigue Life
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Solution Overview
Problem
High pressure presses face challenges due to imbalanced and misdirected forces, leading to uneven stress distribution and potential component failure, such as cracking and reduced fatigue life, caused by manufacturing imperfections and hydraulic imbalances.
Innovation Solution
A piston cavity sleeve with a greater inner radius of curvature is introduced to reduce stress concentrations and improve the structural integrity of press bases, which can be used to strengthen existing press bases by increasing the radius of curvature and inserting a sleeve with thickened corners to mitigate stress and crack propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional piston cavity with small radius of curvature is used, then the press base can be manufactured with standard geometry, but stress concentrations occur leading to crack formation and reduced fatigue life
Solution Approach 1:
The patent applies curvature by increasing the radius of curvature at the juncture of the piston cavity side wall and floor. This geometric modification eliminates stress concentration points that would otherwise lead to crack formation under cyclic loading, thereby improving fatigue life and reliability of the press base.
Solution Approach 2:
The patent applies local quality by reinforcing only the specific region where stress concentration occurs - the juncture of the piston cavity side wall and floor - rather than uniformly strengthening the entire press base. This targeted approach uses local geometry modification and optional localized material addition to address the specific problem area.
2Stress or pressure
If material is removed to increase the radius of curvature, then stress concentrations are reduced, but the press base structure is weakened
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the piston cavity, specifically increasing the radius of curvature at the critical juncture. This parameter modification redistributes stress more evenly throughout the press base structure, reducing peak stress concentrations while maintaining overall structural integrity.
Solution Approach 2:
The patent applies composite materials by providing a press base comprising a base material and a reinforcement material applied to the inner surface of the press base. The reinforcement material is specifically placed at regions subject to stress concentration, creating a composite structure that combines the properties of both materials to resist cracking while maintaining structural strength.
3Reliability
If a piston cavity sleeve is inserted to reinforce the press base, then crack propagation is prevented, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the press base into functional regions - the base structure and the reinforcement layer - that can be manufactured and prepared separately before being assembled together. This allows each component to be optimized independently and simplifies the reinforcement process.
Solution Approach 2:
The patent applies the intermediary principle by introducing a reinforcement material as an intermediate layer between the base material and the internal cavity. This intermediary layer acts as a barrier to crack propagation and stress concentration, protecting the base structure from failure.
Data Source
AI summary
High pressure presses, components for high pressure presses and related methods are provided herein. In one embodiment of the invention, a press base may include a piston cavity formed in the press base and a piston cavity sleeve positioned in the piston cavity. The piston cavity sleeve may include a wall having an outer surface and an inner surface opposite the outer surface. The piston cavity sleeve may further include a floor having an upper surface and a lower surface opposite the upper surface. An outer radius may be formed at a juncture of the outer surface of the wall and lower surface of the floor and an inner radius may be formed at a juncture of the inner surface of the wall and upper surface of the floor. The inner radius may exhibit a radius of curvature that is greater than a radius of curvature of the outer radius.