Gravity Pour

Also known as Tilt Pour Permanent Mold, Semi-Permanent Mold, Gravity Die Casting, Static Permanent Mold, Permold and Permanent Mould. Permanent Mold utilizes iron or steel molds having the reverse image of the part being produced. Molten metal is poured into the mold using gravity (static or tilt pour). The cavity is filled through a gating system and solidifies after several minutes. The mold is then opened and the aluminum casting is ejected from it. Magma Casting Simulation is used to determine the best technique for filling the casting. The molten aluminum can be poured directly into the mold (Static) or into pouring cups with the mold in a vertical position (Tilt Pour). Once the metal is poured into the pouring cups, the mold is slowly rotated to the horizontal position. Under gravity, the metal slowly fills the mold cavity at a constant rate. The Permanent Mold process is very stable and repeatable resulting in a consistent quality casting.

Semi-Permanent Mold is an iron or steel mold utilizing sand cores to create complex geometries that cannot be formed by just the mold. Cores can be made from the Shell Core or Isocure Core making processes. Cores are placed in the mold prior to metal being poured. Semi-Permanent Mold = An Iron or Steel Mold + Sand Core(s).

Advantages of Tilt / Gravity Pour Permanent Mold

  • Permanent Mold castings offer Superior Mechanical Properties (Yield, Tensile and Elongation) than conventional casting processes
  • Overall part quality is improved
  • Improved surface finish
  • Tighter tolerances are achieved than conventional Sand castings.
  • Spray coatings (Insulating and Chill coatings) are easier to apply in the mold resulting in an improved overall part quality.
  • Tighter tolerances in Permanent Mold often result in less machining and lower overall costs compared to sand casting

Since 1946 Le Sueur Incorporated has been a leader in the casting industry. Permanent Mold has been a staple of our business resulting in outstanding supplier relationships lasting 60 years and beyond. LSI has state-of-the-art Permanent Molding machines including Low Pressure and Gravity/Tilt Pour, allowing us to meet and/or exceed customer requirements. Combined with our internal quality capabilities such as Complete Metallurgical Lab (material certification, chemistry and test bars), NDT lab for X-Ray, Liquid Penetrant inspection and In-house Heat Treating, LSI is a full service supplier ensuring that our customers receive consistent quality products and service. LSI pours many alloys including A356, 356, 319, 333, C355, 355 and 413.

Le Sueur Incorporated is a leader in manufacturing dimensionally challenging, complex and pressure tight/leak tight castings. Early involvement is key. We would appreciate the opportunity to show you first hand our many capabilities offered at Le Sueur Incorporated.

Permanent Mold Casting Applications

  • Air Cylinders
  • Base Castings
  • Cold Plates
  • Compressor Bodies
  • Cooling Fins and Fans
  • Couplings
  • Covers
  • Diaphragm Pumps
  • Differential Housings
  • Engine Mid Plates
  • Filter Bases
  • Gear Box Housings
  • Gear Cases
  • Heating Elements
  • Hydraulic Cylinders
  • Oil Pans
  • Pistons
  • Pressure Housings
  • Suspension Components
  • Transmission Channel Plates
  • Transmission Housings
  • Transom Base Mounts for Marine Applications
  • Valve Bodies
  • Valve Housings

LSI specializes in dimensionally complex, pressure tight aluminum castings and thermoplastic injection molded components. We offer complete in-house precision machining, finishing and assembly. Please contact us if you have a project to discuss!