Gas-Introducing Nozzle for Casting Apparatus
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Solution Overview
Problem
Conventional casting apparatuses for mass-producing castings using the gas-introducing casting method face issues with gas leaks due to detachment of the gas-introducing opening from the sprue during mold conveyance, leading to insufficient pressure and defects like underfills in the castings.
Innovation Solution
A casting apparatus with a nozzle-attaching/detaching mechanism and a gas supply system that ensures continuous connection of the gas-introducing opening to the sprue through a universal joint and precise control of the nozzle's position, using a gas supply unit that follows the mold conveyance, and a melt-surface-detecting system to optimize gas introduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gas-introducing opening is connected to the sprue during mold conveyance, then gas pressure is maintained for proper filling, but the connection may detach due to inertia from speed changes causing gas leaks
Solution Approach 1:
The nozzle is designed to move together with the mold during conveyance, transforming from a static connection to a dynamic one. The nozzle-attaching/detaching means enables the nozzle to follow the mold's motion, maintaining connection reliability while adapting to speed changes without detachment
Solution Approach 2:
The nozzle-attaching/detaching means acts as an intermediary mechanism between the nozzle and the mold. It provides a controlled connection that can accommodate motion changes, serving as a buffer that maintains gas pressure while preventing detachment during conveyance
2Reliability
If the nozzle moves with the mold during conveyance, then connection is maintained, but the system requires complex moving means and control mechanisms
Solution Approach 1:
The nozzle and mold conveyance are merged into a coordinated system. The nozzle-attaching/detaching means combines the nozzle movement with the mold conveyance rhythm, eliminating the need for separate complex control systems while maintaining reliable gas introduction
3Loss of substance
If less melt is poured into the cavity, then pouring yield improves, but insufficient gas pressure causes underfilling defects
Solution Approach 1:
Gas is introduced into the cavity before the melt is poured. This preliminary gas presence creates the necessary pressure environment in advance, ensuring that even with reduced melt volume, the cavity fills properly without underfilling defects
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 apparatus enables mass production of high-quality castings with reduced melt usage by maintaining consistent gas pressure and preventing leaks, thereby improving filling efficiency and reducing defects.
Implementation Method 1
introducing a gas into the cavity through the gas-introducing opening, so that the melt introduced into the cavity is charged into the product cavity portion by pressure (dynamic pressure) generated in the cavity
Data Source
AI summary
A casting apparatus for producing castings using molds each having a sprue, comprising a mold-conveying means for conveying molds each containing a melt poured through the sprue; nozzles each having a gas-introducing opening attachable to and detachable from the sprue; nozzle-attaching/detaching means each moving each nozzle to attach and detach the gas-introducing opening to and from the sprue; moving means for moving the nozzle-attaching/detaching means, such that the nozzle-attaching/detaching means moves following a mold conveyed by the mold-conveying means, while keeping the connection of the gas-introducing opening to the sprue by the nozzle-attaching/detaching means; and a gas supply means connected to each nozzle for supplying a gas to the gas-introducing opening.