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sand mold casting

Ningbo Qili mold sand casting is a manufacturing technique that enables the production of a variety of complex metal parts. It is especially used for producing exterior surfaces or parts that have varying details.

The sand-casting process involves forming a mold by packing sand around a pattern. The mold is divided into two halves, called the cope and drag, which meet along a parting line.


The sand molds used in Ningbo Qili sand mold casting are formed by packing sand around patterns. These patterns are typically made from wood or plastic and can be re-used. The sand pattern is then placed in a metal box (the flask), where it is rammed (or packed) to form a cavity that will eventually form the part.

The pattern can also be made from loose pieces of sand that are cut up and shaped into different shapes as required for the part being cast. These are usually more expensive than other types of patterns and require skilled labor to make.

During the sand mold process, a number of considerations must be made to ensure that the pattern releases safely and the cavity fills with metal smoothly without turbulence or bubbles. These include draft allowances on all vertical surfaces, gates that allow the cavity to fill slowly, and risers that prevent shrinkage cavities from forming as the molten metal cools.

Another concern is that trapped air can permeate through the sand to a certain extent as the cavity fills, so risers should be carefully placed to prevent this. In addition, the sand should be carefully sifted to remove any large pieces of sand that could become lodged in the void formed by the pattern or to ensure that there are no pockets of air that could trap metal as it is poured into the mold cavity.

A gating system is often added to the pattern to reduce the number of hand-cutting and other molding steps that need to be done. This is done by adding a series of gates and runners to the pattern. This method can reduce the time and effort required to produce a sand mold for a particular casting and improve overall quality.

Why choose Ningbo Qili sand mold casting?

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Ningbo Qili parts of sand casting mold is a metal casting process that works best with materials that are too high in melting temperature for other processes. It is used for a variety of applications, including aerospace and automotive parts.

Castings in sand Mold castings are formed by mixing sand, bonding agents, and water. The sand can be made from new or recycled sand and is compacted with additional additives for specific purposes. The mold mixture can also contain auxiliary substances (such as sawdust, coal powder, or straw) that help improve air permeability.

After the sand is prepared, it is delivered to the molding floor and molded into a mold cavity. The mold cavity is then filled with liquid metal, and the casting is poured into it.

A pattern is made from a full-size model of the part that will be molded in the sand mold. The pattern includes the details of the finished product and will account for shrinkage allowance. A shrinkage allowance is needed for the contractions that occur when a part cools from a solid state to a liquid state.

The pattern is firmly packed into the sand by hand or machine. This can be done by a jolt-squeeze machine or by hand with a hammer.

Once the pattern is in place, it is rolled over on a mold board to create a surface that separates the sand. The surface is then smoothed to remove the pattern.

These separating lines are called dividers. These are then connected by gates and runners, which provide channels for the poured metal to enter the part. These gates and runners are necessary for accurate casting.

In addition to the gate and runner systems, a riser is included in the mold, which feeds liquid metal to the casting during the process of solidification and cooling. This helps keep shrinkage voids from forming in the main casting, which is very important for making good castings. 

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