Die draft

Draft is the degree to which a mold core can be tapered.To smoothly eject the casting from the die,a precise draft is needed. However, draft is not constant and varies according to the angle of the wall, and a host of characteristics can affect the process,including the type of molten alloy used,shape of the wall,and depth of the mold. Mold geometry is another factor that influences draft. Generally, tapering is needed for untapped holes because of the risk of shrinkage.Likewise,inner walls need more drafting than outer walls because inner walls can also shrink.

Fillets

Fillets are concave junctions used to smooth angled surfaces. Since sharp corners can hinder the casting process,many molds can create fillets and reduce the risk of production errors with fillets. Fillets can be added almost anywhere on the mold except the parting line.

Parting Lines

The parting line,or parting surface,is used to join different sections of the mold together. Material can seep through the gap between the mold pieces when the parting line is wrongly positioned or is deformed because of work strain. This can result in non-uniform molding and excessive seaming.

Bosses

Bosses are die cast knobs,which serve as stand-offs or mounting points in the design of mold.To make sure that wall thickness in a molded product is uniform,manufactures usually add a hole to the internal structure of the boss. It is difficult to fill deep bosses with metal,so filleting and ribbing may be a necessary choice on this issue.

Ribs

Die casting ribs can help improve material strength in products that lack the desired wall thickness. With the support selective rib placement,the chance of stress cracking and non-uniform thickness can be reduced. Selective rib placement also contributes to decreasing product weight and improving fill capabilities.

Holes and Windows

Having holes or windows in a die casting mold directly impacts the ejection mechanism of a completed mold and allows for the creation of substantial drafts. Features like flashovers,overflows,and cross feeders are required to prevent unwanted casting or poor material flow.

Symbols

Manufacturers usually include brand names or product logos in the mold design of die casting products. Despite the fact that symbols do not make the die casting process complex,they can influence the cost of production. A raised logo or symbol requires additional molten metal volume for each manufactured part,adding to the costs of production. In contrast,a recessed symbol requires less raw material,reducing costs.

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