Brass casting process and brass casting method from jiachuan's blog

What exactly is the brass casting process? What is the brass casting method? Brass casting is actually an earlier metal thermal processing process. Brass casting process has a history of about 6000 years. Definition of brass casting process: It refers to the processing method of melting solid brass into liquid brass and pouring it into a mold of a specific shape, and then solidifying and forming. In addition to casting brass, copper, iron, aluminum, tin, lead, etc. can also be cast. Common casting mold materials include raw sand, clay, water glass, resin and other auxiliary materials. Special casting molds include: investment casting, evaporation model casting, metal casting, ceramic casting, etc. (original sand includes: quartz sand, magnesia, zircon sand, chromite sand, forsterite sand, cyanide sand, graphite sand, iron sand,

Minimum temperature required for brass casting process

Under normal circumstances, it is 960 ° C, which is about to crystallize. Generally at least 980°C is used, which is the lowest casting temperature. This is high zinc brass, and low zinc brass is higher.

Advantages of the Brass Casting Process

The manufacturing cost is low, the process flexibility is large, and the complex shapes and large castings can be obtained. It occupies a large proportion in machinery manufacturing, such as machine tools accounting for 60-80%, automobiles accounting for 25%, and tractors accounting for 50-60%.

Commonly used brass casting methods

There are generally three brass casting methods that have been proven suitable for brass casting. Metal casters can choose to be tested using different methods and should not limit themselves.

1. Lost wax casting:

Bronze is usually cast in lost wax casting, but can also be used for brass, really for any other metal. By using wax molds covered with ceramic shells, artisans can inject molten alloys in place of wax. Small messy casings will reveal shards of brass. Lost wax casting requires great attention to detail when used. Artists or metal casters who make decorative copper pieces or sculptures find lost wax casting techniques better for their needs than other techniques and methods.

2. Die casting:

Die-cast brass casting is another method. Die casting is often used in commercial foundries because of the low initial start-up costs and poor foundries. By creating a reusable mold made of steel, casters will be able to make products with the same score. If the caster or artist is planning to make multiple products and find a viable market, a mold made of brass should be used.

3. Sand casting:

Sand casting is probably the oldest type of casting and is still a common method, especially for small foundries. Pour the brass into a sand mold to create a unique look that may be the craftsman's first choice. Sand casting is usually the most economical small foundry. If castings aren't incredibly appealing, this approach is much preferable.

Brass casting process

1. Preparation of casting moulds (containers in which liquid metal is made into solid castings). Casting molds can be divided into sand molds, metal molds, ceramic molds, clay molds, graphite molds, etc. according to the materials used. According to the number of uses, they can be divided into disposable molds, semi-permanent molds and permanent molds, each with its own advantages and disadvantages. Mold preparation is the main factor affecting the quality of castings;

2. The smelting and pouring of cast metals and cast metals (cast alloys) mainly include various types of cast iron, cast steel and cast non-ferrous metals and alloys;

3. Casting processing and inspection. Casting processing includes removal of casting core and surface foreign matter, removal of pouring risers, relief grinding of burrs and overhangs, as well as heat treatment, shaping, anti-rust treatment and roughing.

The casting process can be divided into three basic parts, namely casting metal preparation, mold preparation and casting processing. Cast metal refers to the metal material used for casting castings in foundry production. It is an alloy composed of metal elements as the main component, and other metal or non-metal elements are added. Traditionally called casting alloys, it mainly includes cast iron, cast steel and cast non-ferrous alloys.

How to improve the hardness of brass castings

Add trace cobalt (0.2%, 0.4%, 0.6%) to aluminum brass (72.5Cu-22.7Zn-3.4Al) to study the effect of trace cobalt, smelting and casting processes and processing parameters on strip machining and rolling properties . Explore the use of aluminum brass to replace the currently widely used elastic copper alloy material. The feasibility study results of tin phosphor bronze show that cobalt can effectively reduce the grain size of the as-cast alloy, change the shape of the grain, improve the tensile strength and hardness of the alloy, and ensure the alloy has better ductility. Aluminum brass 0.4% cobalt is added to it. The brass strip produced by reasonable processing technology has better performance than tin phosphor bronze. The 0.25mm thick strip has a tensile strength of 840.4MPa and an elongation of 2.8%; the Vickers hardness value is 228, and the maximum tensile strength (805MPa) of the QSn6.5-0.1 strip in the hard state of the drill is increased by 4.4%. It meets the requirements of using elastic elements; at the same time, because brass contains 22.7% zinc, it can effectively reduce costs and has practical application value.