Gravity Casting (Permanent Mold)

Description

Gravity casting, also known as permanent mold casting, is a metal casting manufacturing process that utilizes gravity to fill reusable steel or iron molds with molten metal. Unlike sand casting which uses disposable molds, permanent mold casting employs metal molds that can be reused for thousands of production cycles, making it highly cost-effective for medium to high volume production. This casting method produces metal parts with superior dimensional accuracy, tighter tolerances, and significantly better surface finish compared to sand casting. The process is particularly well-suited for aluminum and magnesium alloys, offering an excellent balance between production efficiency, part quality, and manufacturing cost.

Key Advantages

• Better surface finish than sand casting, often requiring minimal finishing operations
• Improved dimensional accuracy with tolerances typically within ±0.010 inches
• Reusable molds providing cost advantages for medium to high volume production
• Faster production cycles compared to sand casting processes
• Consistent part quality with reduced variation between castings
• Finer grain structure resulting in improved mechanical properties
• Reduced porosity and casting defects compared to sand casting
• Ability to achieve thinner wall sections and more complex geometries

Common Applications

• Automotive pistons, cylinder heads, and engine components
• Cylinder heads for internal combustion engines
• Valve components, valve bodies, and fluid control systems
• Wheels and brake components for automotive applications
• Aerospace structural components and aircraft parts
• Marine engine components and boat hardware
• Industrial pump housings and compressor components
• Electrical equipment housings and enclosures

Process Video