What Is Investment Casting Process?


Author: Loyd
Published: 25 Nov 2021

Investment Casting of Aluminum

Investment casting can be used for making components that require tighter tolerances, thinner walls and better surface finish than can be achieved with sand casting. The way the mould is made is the distinguishing feature of investment casting. A pattern of the part is made with wax and dipped into a fine ceramic slurry.

The ceramic shell mould is heated inside an oven to melt out the wax and then dried and put back in place. The investment casting method is used for precision casting of components in theAerospace industry. The mold is filled with molten metal that can be solidified.

The melt is poured to fill the mold while it is still hot. The mold is destroyed when the part is cooled. Investment casting does not require the use of machines to achieve tolerances and surface finishes.

Investment casting can be used to cast the same or similar aluminum alloy as other methods, such as sand casting and permanent mould casting. They have some nuances that should be captured for the production of high-integrity castings. Table 4.1 shows a selection of investment cast aluminum.

Table 4.2 shows the minimum properties of some common alloys. The investment casting of jewelry items uses a soft tool that is produced from a positive model to inject waxes in a flask and after dewax, burnout and preheating are cast under vacuum. Once they are removed from the cast tree, the net shape castings need minimum finishing.

Dawang Investment Casting

Investment casting companies are providing production lines. Dawang casting has produced high-quality castings all over the world. Investment casting uses a pouring system.

Dawang casting is a popular steel investment casting manufacturer. Their services include metal and steel casting. Dawang casting products have been used in different industries.

They are not limited to one industry. Investment casting wax is a type of product. The wax is covered with a ceramic shell.

The next procedure in which wax is melted and transferred is in a boiler. Investment casting is a method of process in which different applications and patterns are selected. The pattern of the layer of wax being put into a die was a result of the complexity of the solutions for many different objects.

The cost of a shape can cause it to be more precise in the product. Investment casting products are complex due to several aspects of their complexity and global desires, and it is a relatively luxurious procedure. Its benefits are more than its cost and it is a lifetime expense.

Heat Treatment of a Precision Machine

The heat treatment is done after the castings are finished. The process can improve the mechanical properties of blanks. Normalizing, Archetype, HRC, and carburizing are the main heat treatment processes.

A Single Investment Casting

Investment casting is a good way to make something. A single casting can be made from many components. The more that are combined, the better.

Multi-piece components can be converted to a single investment casting. The ceramic shell is made from smooth patterns created by injecting wax into a die. A 125 micro finish is standard, and even fine finishes are not uncommon.

Casting Process

The casting process is a manufacturing process in which molten metal is poured into a mold and allowed to solidify in the mold, after which the casting is taken out by breaking the mold. The core making is after the pattern is made. The core is made when the casting requires something.

The sand is higher in purity. The mold making is after the core is made. There are two types of sand used in the casting process.

Greensand is a mixture of various materials. Sand fast curing glue are the main ingredients of dry clay. Permanent casting in which molten metal is poured into a die with a ladle is called gravity die casting.

The melted metal will not act other than gravity. The material is made by gravity die casting. The cold chamber is not connected to the furnace.

The metal is poured through the hole in the gooseneck with the help of a ladle. The cold chamber is where the casting is done. Casting is a method of manufacturing that helps the manufacturing industries to produce a variety of products.

On the disadvantages of investment casting

Investment casting is a popular method of casting. It has many advantages over other methods and provides highly detailed parts that are loyal to their molds, however there are some notable disadvantages that must be discussed.

The cost of manufacturing pistols

The cost is the main disadvantage. There are a lot of operations that need labor and sometimes there are minute defects that occur. Gun manufacturing has moved to investment casting to lower costs of producing pistols, but the cost is still less than bymachining from bar stock.

Performance of investment casting in titanium aluminides

Investment casting involves pouring molten alloy into a ceramic mould, followed by active heat removal and controlled solidification of the component. The main parameters to control are active heat removal from the cast mould and minimal variation. There is a fig.

4.22. The plot compares standard and premium investment casting processes. The table shows the Weibull modulus for each condition.

The two conditions have different probability of failure, even though they are heat-treated the same way. CAE simulation software is unique and an inexpensive alternative to analyze and evaluate rapid tools because many parameters inside the cavity are not easy to measure. The modular nature of the tool plate and frame assembly allows for reuse of the material for similar tool dimensions, which leads to more savings in time and cost.

The findings show that the rapid wax injection tooling is an appropriate alternative for mass production. The rapid wax injection tooling technique could replace many expensive, time- consuming, and complex machining techniques. After the casting and grinding processes, process inspection based on attributes should be done.

Depending on the customer specification and the terms of the contract, there may be a need for output or final inspection. Although laboratory results are promising and development work in titanium aluminides is well advanced, no ordered alloy has reached the point where sufficient manufacturing and design data exist to permit engineering utilization of such alloys in other than experimental hardware. The mechanical properties being observed, particularly at elevated temperature, combined with a high aluminum content, which promises good oxidation resistance at elevated temperatures, direct attention to the aluminides as potentially very useful for future gas turbine design.

Designing Investment Cast Products

The cast products are revealed when the ceramic mold is broken away. Any additional finishing or treatment procedures are applied after the gates and sprues are removed. Investment casting uses common materials that include steels, aluminum, nickel, titanium, and copper.

Investment casting can be used for both short and long production runs, and can produce several hundred products at a time. Investment casting's mold can be used in many different ways. Because the mold is expendable, and because wax patterns can be removed in liquid form, manufacturers have an exceptional amount of freedom when designing investment cast products.

Investment casting provides more complex design capabilities than other methods. Understanding the design parameters of the casting you are trying to buy is important. If investment castings can offer a net shape part without the need for milling, then the additional cost for investment casting may be justified.

Centrifugal Casting Process

The mold is filled with liquid metal that matches the part's shape and size. Metal liquid forming or casting is a method of production that waits for it to cool and solidify to get a blank part. A method of casting that usually involves making patterns in materials that are covered with other materials and then melting the pattern out of a mold shell to make a mold without a surface.

Casting pipes were first used. In the US and abroad, metallurgy, mining, transportation, irrigation and drainage machinery, aviation, national defense, automotive and other industries have used Centrifugal Casting processes to produce steel, iron and non-ferrous carbon alloy castings. The production of Centrifugal cast iron tubes, internal combustion engine cylinder liners and shaft sleeves is the most common.

It refers to a method in which liquid metal is filled with a metal mold under the action of gravity and cooled and solidified in the mold to make a casting. Metal casting is suitable for large-scale production of non-ferrous alloy castings such as aluminum and magnesium with complex shapes, as well as iron and steel metal castings and ingots. It is a method forming metal under high pressure and then getting the product or blank.

It has advantages of high utilization rate of liquid metal, simplified process and stable quality. It is an energy-saving metal forming technology. A model cluster is formed by combining foam and paraffin models similar to the size and shape of the casting to make it.

After brushing and drying it is buried in sand. Liquid metal is formed after solidification and cooling after being poured under negative pressure to destroy the model. It is suitable for the production of large precision castings.

Dawang steel casting

Investment casting manufacturers use wax investment casting process to make precision castings. It can cast metallic in precise ways. The investment casting mold is used to make a ceramic, plaster, or plastic shell around the wax object.

Remove the wax and complete the investment process. The metal is poured into the shell to make investment casting products. The investment casting process has 8 main steps.

The primary step is to create a pattern for investment casting which will help shape the ceramic shell. Investment casting companies use investment casting materials that are of the highest quality. It is important that we understand the lost wax investment casting.

The shell should be warm to a specific temperature to prevent freezing off during the injection process. The shell should be kept cool until it is filled. Investment casting companies use a ceramic cup to melt alloy.

The shell can be poured when the alloy reaches its melting point. You should cut the shell from the ground and the sprue when you remove it from the tree. The chop saw, torch or laser is the only way to cut parts.


Door handles, locks, the outer casing or housing for motor, pumps, and wheels are some examples of Casting. Toy parts are made using casting, and so on. The knuckle joint is used to connect two rods.

3D printing wax patterns for investment casting

Investment casting is a very old method of manufacturing. The first use of investment casting to create the head of Medusa is said to have taken place in 1100 AD. The preferred material for creating prototypes was beeswax, while clays were used to make the molds.

Once the mold is fully hardened, it is placed inside a furnace and turned upside-down. The wax can flow out of the mold if the temperature is hot. Commercial applications of the technology usually involve the recovery and reuse of the wax that runs out of the mold.

Investment casting is often the preferred method of manufacturing because it can recreate highly detailed models even with small features and thin walls. The level of detail is good enough for industries that rely on high-precision tools and components. The benefit of investment casting has begun to be recognized by jewelry makers.

The metal casts that come out of the mold come out with smooth surfaces because of the process by which the mold is made. The metal casts will still need some post-processing, but they will be done in less time and work. Investment casting is a good way to create turbine blades.

If the geometry of your model contains a hollow core, you might need to look into other, more appropriate methods. Investment casting has taken a big step in the last few years by combining it with 3D printing, specifically FDM printing, using wax. The idea is simple: instead of using a machine to make a pattern out of wax, a 3D printer can be used to make it.

Pattern formation by dipped ceramic layer

The metal casting pattern is dipped in a mixture of water and binders. A ceramic layer is obtained over the pattern. The pattern is dipped into the slurry multiple times to increase the thickness of the ceramic coat. In some cases the pattern can be placed in a flask and the ceramic slurry poured over it.

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