Molten Metal Syringe Bypass Flow for Precise Discharge Control
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Solution Overview
Problem
The challenge of controlling the discharge amount of molten metal with high accuracy is difficult due to the instability in the volume change within the syringe as the shaft moves up and down, especially in smaller semiconductor devices with smaller joint portions.
Innovation Solution
A molten metal discharging device with a bypass path connecting the storage section and an opening above the molten metal surface, allowing controlled flow through a cover or flow rate control valve to manage the discharge volume accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shaft moves up and down to discharge molten metal, then the discharge operation is simple, but the discharge amount becomes unstable due to volume change in the syringe
Solution Approach 1:
The syringe is divided into two separate discharge paths: a main discharge path and a bypass path. The bypass path includes a bypass hole and flow rate control valve, allowing independent control of molten metal flow. This segmentation enables precise control of discharge amount by adjusting the bypass flow separately from the main discharge, resolving the instability caused by syringe volume changes.
Solution Approach 2:
A flow rate control valve is introduced as an intermediary component in the bypass path. This valve acts as a mediator to regulate the molten metal flow rate independently, allowing precise control of the discharge amount without being affected by the shaft movement or syringe volume changes. The intermediary component provides fine-tuned control over the discharge characteristics.
2Volume of moving object
If the joint portion area is reduced for smaller semiconductor devices, then the device size is reduced, but the discharge amount control accuracy becomes more difficult
Solution Approach 1:
The discharge system is segmented into main discharge and bypass discharge paths. The bypass path with flow rate control valve allows independent adjustment of molten metal flow, enabling precise control of discharge amount even for small joint portions. This segmentation provides the fine control capability needed for reduced device sizes.
Solution Approach 2:
The flow rate control valve in the bypass path enables dynamic adjustment of flow parameters. By changing the valve opening degree, the molten metal flow rate can be precisely controlled to match the reduced requirements of smaller joint portions, maintaining control accuracy despite the reduced scale.
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 control of the molten metal discharge volume by managing the flow through the bypass path, independent of syringe volume changes, ensuring stable and accurate application.
Implementation Method 1
a heater provided around the syringe and heating the molten metal to keep the molten metal in a molten state
Implementation Method 2
a shaft sliding inside the syringe to press the molten metal stored within the storage section
Data Source
AI summary
A syringe (3) includes a storage section (3a) that stores molten metal (1), a discharge nozzle (3b) that discharges the molten metal (1) stored in the storage section (3a), an opening (3c) different from the discharge nozzle (3b), and a bypass path (3d) that connects the opening (3c) and the storage section (3a) and through which the molten metal (1) flows. A heater (5) is provided around the syringe (3) and heating the molten metal (1) to keep it in a molten state. A shaft (4) slides inside the syringe (3) to press the molten metal (1) stored within the storage section (3a). A cover (9) is provided on the opening (3c) and opens and closes. The opening (3c) is positioned above an upper surface of the molten metal (1) inside the syringe (3).