Precision sand casting carbon

Molding box and materials
A multi-part molding box (known as a Casting flask, the top and bottom halves of which are known respectively as the cope and drag) is prepared to receive the pattern. Molding boxes are made in segments that may be latched to each other and to end closures. For a simple object-flat on one side-the lower portion of the box, closed at the bottom, will be filled with a molding sand. The sand is packed in through a vibratory process called ramming, and in this case, periodically screeded level. The surface of the sand may then be stabilized with a sizing compound. The pattern is placed on the sand and another molding box segment is added. Additional sand is rammed over and around the pattern.

Pattern

From the design, provided by an engineer or designer, a skilled pattern maker builds a pattern of the object to be produced, using wood, metal, or a plastic such as expanded polystyrene. Sand can be ground, swept or strickled into shape. The metal to be cast will contract during solidification, and this may be non-uniform due to uneven cooling. Therefore, the pattern must be slightly larger than the finished product, a difference known as contraction allowance. Pattern-makers are able to produce suitable patterns using "Contraction rules" (these are sometimes called "shrink allowance rulers" where the ruled markings are deliberately made to a larger spacing according to the percentage of extra length needed). Different scaled rules are used for different metals, because each metal and alloy contracts by an amount distinct from all others. Patterns also have core prints that create registers within the molds into which are placed sand cores. Such cores, sometimes reinforced by wires, are used to create under-cut profiles and cavities which cannot be molded with the cope and drag, such as the interior passages of valves or cooling passages in engine blocks.
Paths for the entrance of metal into the mold cavity constitute the runner system and include the sprue, various feeders which maintain a good metal 'feed', and in-gates which attach the runner system to the casting cavity. Gas and steam generated during casting exit through the permeable sand or via risers, which are added either in the pattern itself, or as separate pieces.

UniSite`s second core activity: serve for machinery and automobile projects
Provide service and relevant parts for mechanical engineering, Construction machinery, agricultural machinery, port hoisting machinery, metallurgy, automobile, chemical, marine machinery.

Product range:
A.Big Machining(machining center, boring and milling, lathe)
B.Small Machining(cnc, milling, grinding)
C.Casting (sand, investment)
D.Die Casting
E.Forging
F.Stamping and Bending
Product list:
Service Key Customers in the following fields:
- Machinery Products(like Wind Turbine Generate System Hub, Wind Power Bearing Block, Punching Machine Sliding Block, Punching Machine, diesel power generator base, die casting machine base, injection molding machine base, punch, tank, pump parts, accumulators parts, valve parts, Construction Parts, agricultural parts etc.)
- Machinery Products
- Auto Products
- Shipping building Products
- Medical Products
- Oil Products

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