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A similar technique called a cope and drag pattern is often used for large castings or large production runs: in this variation, the two sides of the pattern are mounted on separate pattern plates that can be hooked up to horizontal or vertical machines and moulded with the molding material.
Cope and drag with cores in place on the drag Two sets of castings (bronze and aluminium) from the above sand mold. In foundry work, the terms cope and drag refer respectively to the top and bottom parts of a two-part casting flask, used in sand casting. The flask is a wood or metal frame, which contains the molding sand, providing support to ...
The cope and drag (top and bottom halves, respectively) of a sand mold, with cores in place on the drag. Two sets of castings (bronze and aluminium) from the above sand mold. Sand casting , also known as sand molded casting , is a metal casting process characterized by using sand —known as casting sand —as the mold material.
Molding material: The material that is packed around the pattern and then the pattern is removed to leave the cavity where the casting material will be poured. Flask: The rigid wood or metal frame that holds the molding material. Cope: The top half of the pattern, flask, mold, or core. Drag: The bottom half of the pattern, flask, mold, or core.
The shape of a flask may be square, rectangular, round or any convenient shape. A flask can have any size so long as it is larger than the pattern being used to make the sand mold. Flasks are commonly made of steel, aluminum or even wood. A simple flask has two parts: the cope and the drag. More elaborate flasks may have three or even four parts.
The "false bell" method. The core has a clay false bell shaped on it using strickle boards. The cope (at top) is moulded round the false bell to receive its imprint. Then the cope is lifted to remove the false bell, as shown here. The cope is then lowered back onto the core and the molten metal fills the void created.
Bronze casting showing sprue and risers. A sprue is a large diameter vertical channel through which liquid material is introduced into a mold. It connects the pouring basin to the runner.
A bronze casting showing the sprue and risers. A riser, also known as a feeder, [1] is a reservoir built into a metal casting mold to prevent cavities due to shrinkage.Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify.