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Quick Reference Guide


Top half of a horizontally parted flask, mold, or pattern.

Bottom half of a horizontally parted flask, mold, or pattern.

Cope/Drag Plates
Rather than a single match plate, there are two separate pattern plate/mounts for the cope and drag. The cope (top) half of the pattern is mounted to the cope plate. The drag (bottom) half of the pattern is mounted to the drag plate. Guide pins are used to ensure the cope and drag plates are aligned when put together to form a mold.

A rigid metal or wood frame used to hold sand from which a mold is formed. It usually consists of two parts, cope and drag.

Master Pattern
A pattern constructed with double shrinkage allowance, from which cast production patterns or cast aluminum match plates for production are made.

Match Plate
A plate made of cast aluminum from a master pattern that forms both the cope and drag parts of the mold.

The form shaped by a pattern, made of sand, metal, or refractory material, which contains the cavity into which molten metal is poured to produce a casting of the desired shape.

Mold Cavity
The impression in the mold produced by removal of the pattern. It is filled with the molten metal to form the casting.

A form made of metal, plastic, wood, or other material, around which molding material is placed to make a mold for casting metal. The dimensions of the pattern have shrink
factored in.

Loose Pattern
A pattern not affixed to a plate, used to make molds for castings.

Pattern Plate
Pattern affixed to a plate to make both the cope and drag halves of a mold.

Permanent Mold
A permanent mold is the mold used to produce castings in the permanent mold process. It is made of cast iron so it can be used repeatedly, typically for the life of the product. Molds may be made from CNC machined “Dura Bar” material or custom cast from a pattern and then CNC machined as required.

Green Sand Mold
Mold formed from a pattern using a compressed (jolted or compacted) green sand mixture bonded together with clay and moisture. The mold can be formed using manual or automated processes. The mold is destroyed to remove the casting after it has solidified in the mold. The sand is re-circulated approximately every two hours to make a new mold.

The portion of the gate feature in the mold that connects the down sprue with the casting, ingate, or riser. The term also applies to that part of the pattern which forms the runner. Runners are cut off the part and remelted (recycled).

Also called feeder. It is that part of the gating system that forms the reservoir of molten metal necessary to compensate for losses due to shrinkage as the metal solidifies. It
is also the last place in the mold to solidify and feeds the casting until it is solid.

A vertical cut or hole into the mold that allows molten metal to flow into the mold.

The portion of the gate system that introduces metal into the casting cavity.

Small opening or passage in the mold or core to facilitate the escape of gases when the mold is poured.

A metal insert in the sand mold used to produce localized chilling and control the rate of casting solidification.


Note: Each section contains information about specific subjects or terms as they apply to Pentz Cast Solutions. The Guide is as accurate as possible; however, all material is provided without warranty of any kind.

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