Molding Sand


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molding sand

[′mōld·iŋ ‚sand]
(metallurgy)

Molding Sand

 

a mixture of sand, clay, and highly refractory materials, such as chamotte and asbestos, together with a binder, used for making single-casting and semipermanent molds.

Both natural and synthetic molding sands are used. Different molding sands are used for the casting of pig iron, steel, and nonferrous metals. Molding sands may also be classified as facing sands, black, or floor, sands (for backing and filling), and all-purpose sands. Molds are classified as green-sand, dry-sand, skin-dried, and chemically hardened molds; those in the last category may be hardened by carbon dioxide, or they may be self-hardening. The properties of a molding sand—formability, strength, gas permeability, refractoriness, and collapsibility—depend on the combination of materials used and the way in which the materials are mixed. Recycled sands may also be used as molding sand. Special production equipment is used in the manufacture of molding sands.

References in periodicals archive ?
The cone jolt toughness test is a good tool to evaluate the ability of a prepared molding sand to resist breakage (toughness).
The practice of using one molding sand with multiple metal types (pouring aluminum and copper-base with the same sand system) is becoming popular in the casting industry for both ferrous and nonferrous facilities.
AFS-GFN gives the metalcasting facility a means to verify its molding sand is staying within specification for the castings being produced and avoid conditions that could lead to potential casting problems.
The majority of casting defects in sand casting facilities are sand-related, but many metalcasters fail to recognize that molding sand quality is as important as metal quality.
S&B RAW MATERIALS & APPLICATION TECHNOLOGY FOR FOUNDRY MOLDING SAND SYSTEMS
According to the supplier, the recycler is a small acoustic system that can expand to recycle waste green sand back into core and molding sand, as well as clay back into the green sand system.
The most cost effective pre-blend may be higher in initial price but result in a dramatic bond reduction in the molding sand to offset the cost.
Molding sand must fit the metalcasters' operations in a number of ways, and the following factors weigh in on the sand choice:
Another internet course, Green Sand Control, begins March 6 and offers students a unique understanding of preparing molding sand mixtures, including the various components of the mixture, precautions to take, various testing techniques, and how to collect and interpret data.
We provide advanced technologies for treating metal-bearing wastes including bag house waste, molding sands, and landfill.
The Molding Methods & Materials division papers include the Silver Anniversary paper, "Thermal-Pneumatic Reclamation of Molding Sands for Reuse in Core Work," M.