How We Eliminated Casting Defects with In-House Simulation
In investment casting, the design of gates and runners is crucial to the success of a component. At Primeseal Precision Cast Pvt. Ltd., we recently tackled a significant challenge: shrinkage defects in an 85 kg plug (Plug valve body). Leveraging our in-house simulation software and technical expertise, we achieved defect-free castings while significantly improving yield. Here's a closer look at how we accomplished this—and why simulation has become indispensable in modern foundries.
The Challenge: Shrinkage in a High-Performance Valve Component
Initial production trials revealed shrinkage porosity on both sides of the plug valve body, which could compromise structural integrity and performance under pressure. Given the critical nature of the part, manual trial-and-error was not an option. We turned to our advanced in-house simulation tools to identify and resolve the issue efficiently.
Our Approach: A Simulation-Driven Optimization Process
We adopted a systematic, four-step methodology to ensure predictable and repeatable results:
3D CAD Modeling – Developed and optimized gate and runner geometries to promote directional solidification and uniform metal flow.
Parameter Calibration – Input accurate real-world data, including melt temperatures, alloy properties, and shell characteristics, refined through years of hands-on expertise.
Flow Analysis – Simulated mold filling to detect potential air entrapment and turbulence risks.
Solidification Analysis – Evaluated cooling patterns to pinpoint areas prone to shrinkage porosity.
The initial simulation clearly highlighted shrinkage risks (as shown in the first image below).
The Solution: Redesigned Gating and Strategic Air Vents
Based on simulation insights, we redesigned the gating and runner system and incorporated targeted air vents. This modification effectively relocated any residual shrinkage to non-critical zones. Validated across CF8M and CW6MC stainless steel alloys, the optimized design delivered sound, defect-free castings with substantially higher material yield (second image below).
The Impact: Efficiency, Sustainability, and Reliability
This simulation-led project dramatically reduced development time, minimized material waste, and contributed to a lower carbon footprint. By combining in-house simulation capabilities with a highly skilled team, we consistently achieve "right-first-time" production—delivering superior quality to our clients in valve, pump, and engineering sectors.
Facing a Casting Challenge?
If you're dealing with complex casting issues—whether shrinkage, porosity, or fill problems—we'd love to discuss potential solutions. Contact us today to explore how our simulation expertise and precision investment casting services can support your project. Reach out via our contact form or email at info@primesealcast.com.