Casting Device Depressurized Space Creator Sealing
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Solution Overview
Problem
In vacuum casting molds, air enters the cavity through gaps in the loose-fit hole and through hole, making it difficult to maintain depressurization and reduce gas or air entrainment into the melt.
Innovation Solution
A casting device with a depressurized space creator that covers the insertion hole of the extrusion pin, creating a sealed chamber on the reverse side of the cavity surface to prevent air from entering the cavity, using an extrusion pin with an expanded diameter portion to seal the depressurized space and maintain negative pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If air is sucked to depressurize the cavity, then gas or air entrainment into the melt is reduced, but air enters the cavity through gaps in the loose-fit hole and through hole making depressurization difficult to maintain
Solution Approach 1:
The insertion hole is segmented into two distinct regions: a first region (loose-fit hole) that allows extrusion pin movement, and a second region (through hole) that is sealed by the depressurized space creator. This segmentation enables the loose-fit hole to maintain its movement function while the through hole is sealed to prevent air leakage, resolving the contradiction between pin movement capability and depressurization maintenance.
Solution Approach 2:
The depressurized space creator acts as an intermediary component that seals the gap between the extrusion pin and the insertion hole. By introducing this sealing element, air is prevented from entering the cavity through the loose-fit hole, while the extrusion pin can still move freely within the sealed space, thus maintaining both sealing effectiveness and pin mobility.
2Ease of operation
If a loose-fit hole is used for extrusion pin insertion, then the extrusion pin can move freely to release casted products, but air enters through the gap compromising depressurization
Solution Approach 1:
The insertion hole is divided into a first region (loose-fit hole) for pin movement and a second region (through hole) for sealing. This segmentation allows the pin to move freely in the first region while the second region is sealed by the depressurized space creator, preventing air entry while maintaining operational ease.
Solution Approach 2:
The depressurized space creator functions as a flexible sealing element that adapts to the moving extrusion pin. It maintains a seal around the pin throughout its movement range, preventing air leakage while allowing the pin to move freely for product ejection, thus resolving the contradiction between movement freedom and air sealing.
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
Effectively maintains depressurization in the cavity, reducing gas or air entrainment into the melt during the casting process.
Implementation Method 1
a depressurized space creator (4) configured to create a depressurized space (40) on a reverse side of the cavity surface (2a) to define the cavity (20)
Data Source
AI summary
An object is to provide a casting device that is capable of maintaining depressurization in a cavity. A casting device (1) is configured to move an extrusion pin (3), slidably inserted in an insertion hole (29) formed in a mold (2), into a cavity (20) in the mold to release a casted product. The casting device (1) includes a depressurized space creator (4) configured to create a depressurized space (40) on a reverse side of a cavity surface to define the cavity (20). The depressurized space creator (4) covers an opening of the insertion hole (29) to maintain depressurization in the cavity (20).