Casting Die Sealing Inspection via Vacuum Pressure Measurement
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Solution Overview
Problem
Existing casting mold inspection methods struggle to evaluate the sealing property of casting devices after vacuum drawing has ended, as the connection between the cavity and the vacuum apparatus is severed, making it difficult to measure the pressure inside the cavity at that time.
Innovation Solution
A method and device that acquire the ultimate pressure inside the cavity after a prescribed vacuum drawing time and measure the pressure increase during a stoppage time, using a shut-off valve and pressure detectors to evaluate the sealing properties of the casting device, allowing for inspection even after vacuum drawing has ceased.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the connection between the cavity and vacuum apparatus is severed after vacuum drawing, then the casting process can proceed, but the sealing property cannot be inspected after vacuum drawing ends
Solution Approach 1:
The gas flow path is divided into two segments: a first gas flow path connected to the cavity portion and a second gas flow path connected to the vacuum apparatus. The shut-off valve is positioned to control the first gas flow path, allowing independent operation of the vacuum apparatus while maintaining connection to the cavity for inspection purposes.
Solution Approach 2:
The shut-off valve acts as an intermediary component that can be opened or closed to control gas flow between the cavity and the vacuum apparatus. This mediator enables the system to maintain connection for inspection while allowing the casting process to proceed when needed.
2Reliability
If the sealing material deteriorates with repeated casting, then the sealing property decreases, but continuous monitoring after vacuum drawing is not possible
Solution Approach 1:
The system maintains the connection between the cavity and vacuum apparatus through the open shut-off valve during the stoppage time period. This preliminary action allows inspection to be performed at multiple time points (including after vacuum drawing ends) to detect sealing deterioration before it affects casting quality.
3Measurement precision
If a vacuum sensor is connected to the casting mold, then the degree of vacuum can be measured, but the connection must be severed before injection preparation
Solution Approach 1:
The gas flow path is segmented into separate paths with the shut-off valve controlling the connection between the cavity and vacuum apparatus. This allows the pressure sensor to remain connected to the cavity through the open valve during inspection, while the valve can be closed to isolate the vacuum apparatus for casting operations.
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 evaluation of the sealing properties of the casting device by measuring ultimate pressure and pressure increase, ensuring effective vacuum maintenance and reducing defects in cast products.
Implementation Method 1
a vacuum drawing portion configured to draw a vacuum inside the cavity portion
Implementation Method 2
acquiring an ultimate pressure inside the cavity portion... acquiring a pressure increase inside the cavity portion
Data Source
AI summary
Provided are a casting die inspection method and a casting device, the method including: a step for acquiring the ultimate pressure in a cavity section, at the time when a prescribed vacuuming time has elapsed since evacuation the inside of the cavity section of the casting die was started; a step for evacuating the inside of the cavity section and acquiring an increased pressure in the cavity section that has increased during a prescribed stop time, at the time when the prescribed stop time has elapsed since the evacuation was stopped; a step for evaluating a first sealing property of the casting device on the basis of the ultimate pressure; and a step for evaluating a second sealing property of the casting device on the basis of the increased pressure.