Squeeze Pin Abnormality Detection in Die Cast Molding
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Solution Overview
Problem
Conventional methods for detecting galling in squeeze pins of molding machines are unstable due to variations in mold and oil temperatures, leading to inconsistent operation and potential excessive stroke issues.
Innovation Solution
A method involving repeated molding cycles with lubrication and cooling processes outside the filling phase, using sensors to detect physical parameters like stroke and pressure, and comparing them to reference values to determine abnormality and execute corrective actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If galling detection is performed during the filling phase when molten material is around the squeeze pin, then galling can be detected, but detection stability deteriorates due to variations in melt flow and solidification state caused by changes in mold temperature and oil temperature
Solution Approach 1:
The patent performs lubrication and cooling of the squeeze pin before the filling phase, when the cavity is empty and no molten material is present. This preliminary action allows the squeeze pin to be conditioned properly before the actual molding operation, ensuring consistent detection conditions regardless of subsequent melt temperature variations.
Solution Approach 2:
The patent extracts the detection process from the filling phase and performs it during a separate phase when the cavity is empty. By taking out the detection action from the problematic environment of molten material, the system eliminates the harmful influence of melt flow and solidification state variations on detection stability.
2Reliability
If the squeeze pin advance time is adjusted early in response to detected galling, then galling can be addressed, but excessive stroke occurs in the next cycle due to inaccurate timing
Solution Approach 1:
The patent performs the lubrication and cooling action before the filling phase, establishing proper squeeze pin conditions in advance. This preliminary conditioning ensures that when the filling phase begins, the squeeze pin operates with consistent, known characteristics, allowing for accurate stroke control without excessive advance.
Solution Approach 2:
The patent uses sensors to detect the physical state of the squeeze pin during the lubrication/cooling phase and feeds this information back to the control system. This feedback allows the control device to adjust the squeeze pin operation parameters accurately, preventing both galling and excessive stroke by continuously monitoring and adjusting based on actual squeeze pin conditions.
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
This approach allows for stable detection of squeeze pin abnormalities, independent of molten material flow and solidification state variations, ensuring consistent operation and preventing excessive strokes.
Implementation Method 1
a fluid pressure cylinder having a piston fixed to the squeeze pin and being configured to drive the squeeze pin, a fluid pressure circuit to control the flow of a working fluid supplied to a rod side cylinder chamber and a head side cylinder chamber of the fluid pressure cylinder
Implementation Method 2
a lubricating or cooling process causing the squeeze pin to advance and performing at least one of the lubrication and cooling of the squeeze pin
Implementation Method 3
a lubricating or cooling process causing the squeeze pin to advance and performing at least one of the lubrication and cooling of the squeeze pin
Data Source
AI summary
A molding machine able to stably detect an abnormality of a squeeze pin, for example, a die cast machine having a squeeze pin able to apply pressure to a melt of a cavity repeatedly performing a molding cycle including a pressing process making the squeeze pin advance and applying pressure to the melt of the cavity in a state where the melt is filled in the cavity and a spray process making the squeeze pin advance and performing at least one of lubrication and cooling of the squeeze pin in the state where the melt is not filled in the cavity, and, in the spray process, detecting a stroke of the squeeze pin and detecting an abnormality of the squeeze pin based on a comparison of the detection result about the stroke and a predetermined reference value.