Autoclave Mold Cycle Counter via Thermal Expansion
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Solution Overview
Problem
Existing cycle counter mechanisms for composite layup molds are limited in accurately monitoring service life due to dependence on predetermined usage counts, ignoring temperature and pressure variations, leading to potential failures in final products and increased operational costs.
Innovation Solution
A cycle counter mechanism featuring multiple rods made from different materials with varying elongation coefficients, triggered by temperature and pressure changes, which rotate a gear to provide automatic and independent monitoring of mold usage, adaptable to different molds and environments, and capable of resetting for continued use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a predetermined usage count is used to monitor mold service life, then the monitoring system is simple, but the accuracy of service life determination deteriorates due to ignoring temperature and pressure variations
Solution Approach 1:
The patent changes the monitoring parameter from simple usage count to temperature-based cycle counting. The system integrates temperature data over time and triggers a cycle count only when the temperature exceeds a reference value, thereby adapting the monitoring criteria to actual service conditions while maintaining reasonable system complexity
Solution Approach 2:
The patent employs a bimetallic strip that undergoes thermal expansion and contraction based on temperature changes. This mechanical response to temperature variations directly drives the cycle counting mechanism, converting thermal effects into measurable cycle information without requiring complex electronic sensors
2Measurement precision
If multiple rods with different elongation coefficients are used to account for temperature and pressure variations, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent uses a bimetallic strip composed of two different metals with distinct thermal expansion coefficients. This composite structure naturally responds to temperature changes through differential expansion, providing accurate cycle detection while avoiding the need for multiple separate rods and associated complexity
Solution Approach 2:
The patent combines temperature and pressure monitoring into a single integrated mechanism. The bimetallic strip responds to thermal changes while the system collectively monitors both temperature and pressure cycles, merging multiple monitoring functions into one unified device rather than using separate rods for each parameter
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
Enables precise monitoring of mold usage and service life, reducing failures and operational costs by accounting for temperature and pressure variations, and allowing for timely maintenance and reuse of molds.
Implementation Method 1
a rod (3), which is capable to elongate and contact depending on the heat in the setting when it exceeds a reference temperature value
Implementation Method 2
The cycle counter mechanism according to the present invention comprises more than one rod (3), each manufactured from a different material and each having a structure that can elongate as a result of becoming induced by the pressure and/or temperature variation it is exposed to
Data Source
AI summary
A cycle counter mechanism is provided for monitoring the service life of layup molds, such as a mold used for the manufacturing of parts in an autoclave oven. A body that is suitable for use in the autoclave oven is located on the mold. At least one rod is located on the body which elongates and contracts due to heat. At least one gear is located on the body so as to rotate about its own axis and which extends when the heat in the autoclave oven increases to trigger the gear. A gear is triggered by the rod to rotate about its own axis. A counter is triggered with the rotational movement of the gear and provides information about the number of uses of the mold depending on the rotational movement.