Die Cavity Surface Texturing via Plasma Peening
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Solution Overview
Problem
Existing methods for treating the surface of die casting cavities to improve molten metal fluidity and ease of casting release are limited by the complexity of cavity shapes, inability to control concavo-convex shape sizes and shapes, and issues with angular edges causing scoring and uneven parting agent distribution.
Innovation Solution
A method involving the use of spherical particles to form intermingled first and second dimples on the die surface, with specific size and shape characteristics to reduce contact area, improve fluidity, and enhance release properties, including hemispherical dimples with controlled diameters and depths, and a peening effect to prevent scoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If surface texturing with corrosive liquid or electrical discharge machining is used to form concavo-convex shapes, then the fluidity of molten metal is improved, but the scope of treatable surface is limited and sufficient fluidity cannot be obtained for complex cavity shapes
Solution Approach 1:
The patent replaces conventional mechanical surface texturing methods (corrosive liquid treatment, electrical discharge machining) with a plasma processing method. This substitution enables effective treatment of complex cavity shapes that were previously inaccessible, while maintaining controlled concavo-convex shape formation to improve molten metal fluidity.
2Manufacturing precision
If surface texturing is used to form concavo-convex shapes, then fluidity is improved, but the shapes have angular edges that cause scoring and reduce ease of casting release
Solution Approach 1:
The patent employs plasma processing to form concavo-convex shapes with rounded edges and surfaces, eliminating the angular edges produced by conventional methods. This spheroidality prevents scoring of castings during release while maintaining the fluidity-enhancing concavo-convex structure.
3Manufacturing precision
If concavo-convex shapes are inclined in one direction, then fluidity is improved, but parting agent distribution becomes uneven and ease of casting release is lowered
Solution Approach 1:
The patent creates concavo-convex shapes with uniform distribution and consistent orientation across the cavity surface through controlled plasma processing. This homogeneity ensures even parting agent distribution and maintains both fluidity improvement and ease of casting release.
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 method effectively improves molten metal fluidity and casting release by uniformly dispersing dimples without directional signs, reducing contact area, and preventing scoring, while allowing for complex cavity shapes and uniform parting agent retention.
Implementation Method 1
first particles to be sprayed of a spherical shape having a hardness that is greater than that of the die for casting, are sprayed against the surface of the cavity and thus form first dimples on the surface of the cavity
Implementation Method 2
form first dimples on the surface of the cavity, whereby the surface of the cavity is made up of the area that has no first dimples formed and the area that has the first dimples formed being intermingled with each other
Data Source
AI summary
Disclosed is a method of processing the surface of a cavity a casting die wherein the fluidity is good even if the shape of the surface of the cavity (castings) has a complex shape, mold releasability are excellent, reprocessing is possible, and the life of the die can be prolonged. A step (A) for forming hemispherical first dimples (12) by the particles to be sprayed on the surface of the cavity (11), and a step (B) for forming second dimples (13) by the particles to be sprayed, which second dimples are smaller than the first dimples (12), are provided. A treating method (a) and a treating method (b) where either step (A) or step (B) is carried out depending on the requirements, and a method (c), where only the first dimples (12) are formed by carrying out only step (A) are also provided.