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 ?
Provision of services for the market research of molding sand and investment feasibility study for the development of technology and the supply of equipment for the separation of sand fractions from "-" to 0.
The results of compressive strength and permeability of twelve molding sand mixture experiments based on general factorial design with four levels of content and three levels particle size of rice husk are listed in Table 1.
Delivery of one or two mixers vigorous stirring for total yield of mixing the molding sand from 120 to 150 tons per hour including control systems molding sand parameters which ensure the quality and repeatable mixing of molding parameters necessary for the flaskless molding.
The cone jolt toughness test is a good tool to evaluate the ability of a prepared molding sand to resist breakage (toughness).
Delivery of refrigerators molding with a cooling capacity of molding sand from 120 to 150 tons per hour with the systems of control parameters of the molding, which guarantee the right temperature and humidity molding.
The properties of molding sand mixtures give an indication of the quality of the molding sand mixtures.
2]) Without Cores Emission Characteristics as Related to the 1,800F LOI Molding Sand % >5 LOI or >1.
The size of the sand grains in your molding sand mixture is a critical element in the quality of the castings you produce.
The sand system for the new molding line, which began operation in July 2007, was using molding sand taken from the older part of the metalcasting facility that still operated manual squeezers.
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.