HPHT Press Back-Up with Concave Stress Redirection
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Solution Overview
Problem
High-pressure high-temperature (HPHT) presses face limitations in maximum reaction cell size and payload due to stress fractures caused by shoulder loading, leading to catastrophic failure, and are inefficient and expensive to construct.
Innovation Solution
A cartridge assembly with a back-up structure featuring a concave portion that redirects and distributes load stresses, combined with a hydraulic system applying axial pressure through a piston, to reduce shoulder loading and enhance stress distribution across the anvil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If larger reaction cell size and payload are used, then productivity and output capacity increase, but stress fractures and catastrophic failure risk increase due to shoulder loading
Solution Approach 1:
The backup component incorporates a concave portion with a curved surface that redirects stress lines away from the shoulder region. This curvature geometry transforms the stress distribution pattern, preventing stress concentration at the shoulder interface and enabling larger reaction cells to be used without increasing failure risk
Solution Approach 2:
The backup structure features a localized concave portion specifically positioned at the shoulder region where stress concentration occurs. This local geometric modification针对性地 addresses the stress fracture problem without requiring changes to the entire backup component or press structure, enabling increased output capacity while maintaining reliability
2Force
If larger tonnage press capacity is achieved, then maximum reaction cell size and payload increase, but press weight and construction cost increase significantly
Solution Approach 1:
The concave portion in the backup creates an optimized stress transmission path that reduces shoulder loading. This geometric feature allows the press to handle larger payloads and reaction cells without requiring proportional increases in overall press tonnage capacity, effectively decoupling output capacity from press weight
3Force
If larger tonnage press capacity is achieved, then maximum reaction cell size and payload increase, but construction cost increases
Solution Approach 1:
The concave geometric feature in the backup is a relatively simple structural modification that can be manufactured using conventional machining processes. This design allows existing presses to be upgraded or new presses to be designed with reduced tonnage requirements, significantly lowering construction costs while enabling larger reaction cell operation
Solution Approach 2:
By localizing the stress management solution to a specific feature on the backup component rather than requiring overall press structure reinforcement, the invention reduces material usage and manufacturing complexity, thereby reducing construction costs
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 effectively reduces the likelihood of stress fractures and extends the operational life of HPHT presses by evenly distributing pressure across the anvil, allowing for larger reaction cell sizes and payloads without catastrophic failure.
Implementation Method 1
a hydraulic system may be adapted to apply axial pressure to the backup through the piston
Implementation Method 2
The net concave portion of the backup may enable the backup to effectively redirect and concentrate stress lines from the first interface, which may comprise a generally larger diameter, towards the second interface
Data Source
AI summary
A cartridge assembly for connection to the frame of a high pressure, high temperature press, comprising a front end. The front end may comprise a back up with a conical portion intermediate and coaxial with an anvil and a piston. The anvil may comprise a proximal end in contact with the back-up and a distal end being adapted to form part of a pressurized chamber within the frame. The back-up may comprise a truncated cylinder comprising a first and second interface that are joined by a peripheral cylindrical wall. The cylindrical wall may also comprise a portion extending normally from the periphery of the first interface to a net concave portion of the cylindrical wall. The net concave portion may extend from the normal portion of the cylindrical wall to the periphery of the second interface which abuts the anvil.