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If you want to cast jewelry, you need something which would help the metal to take the desired shape. In the metal casting world, molds work for this purpose. However, what molds are used for metal casting is a real question.

So many are available in the market and which would be the ones used for this purpose is a tough task to know. In this comprehensive guide, a brief introduction to what molds are along with their types which are used for metal casting will be discussed in detail. Let’s learn more about it!

What Molds Are Used For Metal Casting; Defining Jewelry Molds

What Molds Are Used For Metal Casting; Defining Jewelry Molds

Have you seen people making jewelry with a resin by pouring a liquid into a certain type of containment box and then waiting for it to solidify to take the box shape. It’s what a mold is. Molds are made up of various materials and their purpose is to recreate jewelry pieces with consistent quality and shape. They work as a template for the jewelry making process where the molten metal is poured into and remains until it solidifies. 

Molds For Metal Casting

Metal Casting is a process where metal is used to cast into any specific shape. In this process, any metal of choice is melted and as the melting points are very high, normal molds can not be used for this purpose. Molds for metal casting include sand molds, investment molds, metal molds, ceramic molds and graphite molds. 

Sand Molds

Sand Molds

Sand molds are the traditional ways of metal casting. Three different types of sand molds are used and these include Green sand molds, Dry sand molds and Shell molds. Green sand molds are the most commonly used sand molds and they are made up of clay, silica sand, water and other additives. 

It’s called green sand mold because the mold which is used is not in dry state, rather in its wet state when the metal is poured into it. They are popular for being able to withstand high temperatures. Apart from this, Dry Sand molds and Shell molds are also used. The Dry Sand molds are baked before they are used and Shell molds have a thermosetting resin with a sand layer over it which can be used for all types of metal casting.

Investment Molds

Lost wax casting method is also called the investment casting where a wax pattern is created which is coated with a ceramic shell and the mold can then be melted away. A cavity is created and this cavity can then be filled with the molten metal to take its shape.

Metal Molds

Metal Molds

The permanent molds are also called the metal molds. They are also referred to as the die casting molds. They are made up of iron or steel. As they are made up of metal themselves, they can be used for repeated times and can endure high temperatures.

Another type of metal molds which are called the Chill Molds are also used. These are specialized molds where the solidification rate of specific areas can be controlled through chill plates that are inserted in the mold. Through chill molds, a uniform solidification is possible without shrinkage. 

Ceramic Molds

Ceramic molds are developed using materials like silica, zircon, or alumina. These materials are popular for their high temperature endurance. Some metals have high melting points like the steel and super alloys which can be easily casted in these molds. Whether someone wants to use molds for a large scale production or to capture intricate details, for all these purposes, the Ceramic molds are a great option. 

Rubber Molds

Rubber Molds

The most widely used molds are the rubber molds. They are suitable for low temperature metal casting but provide countless benefits like flexibility, durability, great workability and ability of capturing intricate details. When a jewelry is made within this mold, it’s easily removed from it as they prevent damage during removal of pieces through their flexibility.

Silicone Rubber molds are the most preferred ones although other molds like Natural rubber or synthetic rubber molds are also available. But they have limitations to be working with metal casting due to temperature requirements. 

How Molds Are Used For Metal Casting

When jewelry has to be made, the mold is decided on the basis of what type of jewelry is being made and what material is being used to create it. For instance, if the metal has a high melting point then a metal mold or sand mold will be used. However, if the metal has a low melting point then rubber molds can be used. Each mold is used differently. 

How Molds Are Used For Metal Casting

When a die cast mold is being used, it has two parts; the cover die and ejector die. The mold is closed and the molten metal is filled into it. Once solidified, the mold is opened to reveal the final cast. Similarly, each mold is used in a different way. 

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Conclusion

Molds are the template which are used to create jewelry. For metal casting, as the metals have high melting points, specialized molds are used. These molds have high temperature resistance and can withstand pressure. For instance, the metal molds are made up of iron or steel and these are used to create jewelry from metals that have high melting points.

Other molds like sand molds, ceramic molds and rubber molds are also used. For metals that have low melting temperature, the rubber molds are used. These molds offer tremendous qualities over other molds because they are great to work with.

They are durable, flexible and have the capacity to capture details. Jewelers usually use rubber molds for making their jewelry pieces. However, the choice of mold depends on the type of jewelry being made. Once decided, they can be casted easily. Each mold is used differently like the die casting molds have two parts and they are closed to be filled with metal. After solidification the cast is revealed.