Brass Investment Casting Foundry

Brass casting in an investment casting foundry follows a precise metallurgical process that begins with melting brass alloys. Two predominant techniques – sand casting and investment casting – are widely utilized in brass foundries due to their effectiveness. The fundamental procedure involves three critical stages: mold fabrication, molten metal pouring, and controlled solidification. After creating the mold cavity, workers carefully pour the liquefied brass alloy (typically maintained at 900-940°C) and allow it to cool naturally in ambient conditions. Upon complete solidification, technicians remove the mold to extract the finished casting.

The metallurgical composition of brass, primarily a copper-zinc alloy (Cu-Zn), determines its material characteristics. Modern foundries precisely control the copper-zinc ratio (commonly ranging from 60-90% copper) to engineer specific mechanical properties. This compositional control directly impacts the casting’s tensile strength (typically 338-469 MPa), elongation (35-45%), and corrosion resistance – critical factors that dictate the component’s industrial applications in plumbing, marine hardware, and mechanical systems. Advanced foundries may incorporate additional elements like lead (1-3%) to enhance machinability or tin to improve seawater corrosion resistance.

At present, brass, a kind of alloy material that is widely used in the industrial and commercial sectors and even in our daily life, is mainly composed of copper and zinc. Chinese brass manufacturer has excellent mechanical properties, good conductivity, and strong corrosion resistance, which makes it an ideal material for various applications. With the development of technology, there are diverse casting methods for brass, and the following will provide a detailed introduction to several common brass casting methods. It should be noted that different brass service providers may adopt different casting techniques based on specific requirements. As a professional brass supplier, our company has been committed to providing high-quality brass products to meet the demands of the market. Our brass service team is composed of experienced professionals who can offer customized solutions for different customers. Whether you are a domestic or international client, we can provide you with reliable brass products and excellent brass service.

1. Brass Sand mold casting

This method, known as sand casting, is the most commonly used brass casting method in China. As a leading brass manufacturer and supplier, we provide comprehensive brass casting service that covers the entire process from mold making to finishing. The process includes creating a sand mold based on the specific shape and size of the product.

Then, we melt the brass into a liquid state at our advanced brass casting foundry. The molten brass is poured into the sand mold for casting. After the brass cools down in the brass casting foundry, the finished product is carefully demolded and then undergoes meticulous sorting and processing.

Our professional brass service team ensures that each step meets the highest quality standards. As a trusted brass supplier, we offer reliable brass casting service to clients both domestically and internationally. Whether you need small-scale production or large-scale manufacturing, our brass casting service can meet your specific requirements. If you are looking for a China sand casting foundry who can cast brass, please feel free to contact us for a quick quote.

2. Brass Investment casting method in a brass investment casting foundry

Investment casting method is a casting method that uses investment casting to make brass parts in a brass investment casting foundry. Its process includes steps such as mold making, melting, melting brass, casting, cooling, demolding, and sorting. Firstly, create a mold based on the shape and size of the product, then heat the mold to melt it, and then pour the melted brass into the mold for casting. After the brass cools down in the brass investment casting foundry, the finished product is demolded and finally sorted and processed.

3. Brass Die casting method
Die casting method is a casting method that uses pressure to inject molten brass into a mold to form a product. Its process includes steps such as mold making, melting brass, injection, cooling, mold opening, and sorting. Firstly, create a die-casting mold based on the shape and size of the product, then inject the melted brass into the mold, fill the entire mold cavity with pressure, wait for the brass to cool down, and then open the mold to obtain the finished product. Finally, organize and process it.

4. Brass Vacuum casting method
Vacuum casting method is a method of casting brass under vacuum conditions. Its process includes steps such as mold making, melting brass, vacuum pumping, casting, cooling, demolding, and sorting. Firstly, a mold is made based on the shape and size of the product. Then, the brass is melted and placed in a vacuum casting equipment. Through an air extraction operation, the brass is fully wetted on the surface of the mold. After the brass cools down, it is demolded to obtain the finished product. Finally, it is sorted and processed.

5. Brass Continuous casting method
Continuous casting method is a casting method that utilizes continuous casting equipment to continuously cast molten brass into shape. Its process includes steps such as melting brass, continuous casting, cooling, cutting, and finishing. Firstly, the brass is melted and injected into a continuous casting equipment. Through the continuous casting operation of the continuous casting equipment, the brass is formed. After the brass cools down, it is cut into finished products, and finally sorted and processed.

The above are several common brass casting methods used in a brass  casting foundry, each with its own characteristics and applicability. When choosing a casting method, it is necessary to comprehensively consider factors such as the shape, size, quality requirements, and production cost of the product. At the same time, for different casting methods, it is also necessary to pay attention to operational norms and process control to ensure that the quality and performance of the final product meet the requirements.

• Automotive Industry: Brass casting is commonly used in the automotive industry for parts such as engine components, exhaust manifolds, and transmission components. Automotive brass parts are commonly casted in a brass investment casting foundry
• Aerospace Industry: Brass casting is used in the aerospace industry for parts such as fuel system components, hydraulic system components, and electrical connectors.
• Electrical Industry: Brass casting is used in the electrical industry for parts such as connectors, switches, and circuit breakers.
• Plumbing Industry: Brass casting is used in the plumbing industry for parts such as valves, fittings, and faucets.
• Marine Industry: Brass casting is used in the marine industry for parts such as propellers, bearings, and fittings.
• Musical Instrument Industry: Brass casting is used in the musical instrument industry for parts such as trumpet valves, trombone slides, and cymbals.
• Decorative Industry: Brass casting is used in the decorative industry for items such as ornaments, sculptures, and hardware.

Overall, brass casting serves various industries due to its excellent properties, durability, and resistance to wear and corrosion.

Here are some common Brass casting materials that are commonly used in casting:

Overall, These are just a few of the common brass casting materials used in the industry, and the specific material used will depend on the application and desired properties of the finished product.

In the brass investment casting foundry, in order to control the element and impurity content of the brass casting alloy, in addition to selecting furnace materials reasonably and calculating the ingredients correctly, it is also necessary to comprehensively consider the alloy’s performance and processing ability, furnace material properties, oxidation and volatilization melting loss, feeding sequence, melting temperature and time, etc. to determine the calculated composition.

For the pollution situation of flux, furnace lining and operating tools, etc, An estimate should be made and a pre furnace analysis should be conducted in the later stage of brass smelting to determine whether to replenish and dilute the material.

Sometimes the composition and impurity content of the brass alloy are within the national standard range, but there are small amounts of needle like or coarse intermetallic compounds in the brass ingot, or defects such as cold and hot cracks and regional segregation are prone to occur. Therefore, it is necessary to use phase diagrams to understand the solubility changes of solute elements, the equilibrium distribution coefficient of solutes, and the possibility of forming multicomponent compounds or non-equilibrium eutectic.

As long as the internal causes of the above defects are identified, our brass investment casting foundry can adjust the content of certain elements within the national standard range, supplemented by certain process parameters, or add modifiers to refine the grains, Improve the morphology of compound inclusions and the distribution of low melting point phases to achieve the goal of eliminating defects. The purpose of adding errors and adjusting the iron silicon ratio of aluminum in B30 is for this consideration.

On the premise of not reducing usability and processing performance, attention should be paid to saving more expensive metals when determining the ingredient composition of brass. For example, when melting H62 brass, according to the lower limit of its standard content range of 60.5%~63.5% Cu, the 61% Cu ingredient can save about 20 tons of copper for every 1000 tons of H62 melted compared to using 63% Cu.

Minimizing or not using intermediate alloys as much as possible can save fuel and raw material consumption in brass investment casting foundry. For alloys with high impurity limits, add more recycled materials and low-grade new metals to reduce costs.