Die-Casting Runner Volume Section Gas Defect Reduction
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Solution Overview
Problem
In die-casting, residual gas within the die's non-product section is incorporated into the molten metal, leading to gas defects in the product, particularly in pressure vessels where these defects can cause pressure loss and coolant gas leakage.
Innovation Solution
A die-casting die with a runner branching at a section featuring a volume section with an opening wider than the main runner, designed to collect the leading portion of molten metal and retain it before it flows into sub-runners, thereby minimizing gas incorporation into the product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the die is evacuated to reduced pressure before injection, then gas can be partially removed from the die, but residual gas remains in the non-product section and is incorporated into the molten metal
Solution Approach 1:
The invention extracts the harmful residual gas from the flow path by introducing a volume section that captures and isolates the gas-containing leading portion of molten metal, separating it from the gas-free subsequent molten metal that fills the cavity
Solution Approach 2:
The volume section acts as an intermediary structure between the main runner and sub-runners, serving as a gas trap that mediates the separation of gas-contaminated and gas-free molten metal portions
2Object-affected harmful factors
If a volume section with opening wider than main runner is added at the branch section, then gas defects are reduced by collecting leading portion, but the device complexity increases
Solution Approach 1:
The volume section is positioned at the branch section to preliminarily collect and trap the gas-containing leading portion of molten metal before it enters the sub-runners, preventing gas defects in advance
Solution Approach 2:
The invention adds a volumetric dimension to the runner structure by introducing a volume section with specific volume capacity, transforming the linear flow path into a three-dimensional structure that provides gas collection space
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 configuration significantly reduces gas defects in the final product, extending the die's lifespan and improving material yield by effectively managing residual gas within the die.
Implementation Method 1
the leading portion of the poured molten metal is collected in the volume section... the portion of the molten metal containing a large amount of incorporated gas can be prevented from flowing into the cavities
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The purpose of the present invention is to provide a die-casting die which is less likely to cause a gas defect. A die-casting die is configured in such a manner that a runner (1) is branched at a branch section (3) and that cavities are communicated with the respective downstream ends of the branched runners. The runner (1) comprises a main runner (2) which is located upstream of the branch section (3) and sub-runners (4) which are located down-stream of the branch section (3). A volume section (5) having an opening (6) open toward the main runner (2) is formed at the portion of the branch section (3) which is located on a line extended from the main runner (2). The width of the opening (6) is greater than the width of the main runner (2).