Shell Molding

shell molding

[′shel ‚mōld·iŋ]
Forming a rigid, porous, self-supporting refractory mold by sprinkling molding sand blended with thermosetting plastic or resin over a preheated metal pattern and then curing in an oven.

Shell Molding


a method for the production of shaped castings from metal alloys in molds that consist of a mixture of granular sand (usually quartz sand) and a synthetic powder (usually phenol-formaldehyde resin and Bakelite powder). The use of clad grains of sand (covered with a layer of synthetic resin) is preferable.

Shell molds are made by one of two methods. The mixture is spread onto a metal pattern that has been heated to 300°C and held for a while, until a thin, hardened layer forms; the excess mixture is then removed. When using a clad mixture, it is blown into the space between the heated model and the exterior contour plate. Both methods require subsequent hardening of the coating on the model in a furnace at temperatures up to 400°C. The resulting shell half-molds are fastened together, and the liquid melt is poured into the mold. To prevent deformation of the molds when the melt is poured into them, they are placed in a metal jacket before casting, and the space between the mold and the jacket walls is filled with metal shot, whose presence also affects the temperature conditions during cooling of the casting.

Shell molding is used to produce castings weighing up to 25 kg. The advantages of this method are higher productivity than casting in sand molds, control of the mode of cooling of the casting, and the possibility of mechanizing the process.


References in periodicals archive ?
1) stainless steel cast parts by shell molding (25 Unit)
He concluded, "Recent exhibitors added to the online exposition, in addition to existing offerings, include nearly 50 suppliers of shell molding, no bake mold, manganese, investment, aluminum, Ni hard, zinc, Meehanite, sand and investment castings primarily from the United States and China, but not limited to such markets.
The final stop for the raw dough is one of six trough dumpers, where the dough is tipped onto a belt conveyor to the pie shell molding machine, where the actual pie shells are created.
For the frame shell molding, TowFlex fabric is cut into flat pattern plies using a computer-controlled automated cutting table.
For the frame shell molding, TowFlex fabric is cut into flat pattern plies by means of a computer-controlled automated cutting table.
Wrapped in those distinctively opulent gold boxes, you'll find little pieces of fudge covered with a classic Belgian shell molding and delicately decorated with stripes and swirls.
After that time, they will take over a bigger and bigger chunk of the plastic manifold market as cheaper, simpler shell molding becomes the process of first choice, even for manifold suppliers who offer both processes.
In addition to general tips and advice on how to turn chocolate into delectable treats, table tempering and shell molding are explained.
The Megashell Process is a ceramic shell molding and casting process.
of manufacturing space to its existing shell molding facility, with a portion of the addition devoted to thermal sand reclamation.
According to Torque Capital Group, TPC Castings is equipped with a fully automated and environmentally controlled shell molding line and vacuum induction melting furnaces producing equiaxed, directionally solidified and single crystal castings.