Qu'est-ce qu'un procédé de moulage à la cire perdue ?

Investment casting uses wax patterns to make exact metal parts. Many industries use this process. It gives smooth surfaces, so less extra work is needed.

Investment casting gives a smooth finish. This means less work after casting.

KEMING is a trusted company. They use advanced CNC machining and check quality carefully. People pick this method for projects that need accuracy. It is also good for making complex shapes and using different materials.

The global moulage à la cire perdue market was USD 23.01 billion in 2024.
Experts think it will grow to USD 31.38 billion by 2032.

Principaux enseignements

Investment casting makes exact metal parts with wax patterns. This gives smooth surfaces and needs less work after casting.
KEMING uses new technology and strong quality checks. This helps every part meet high standards. It is good for many industries.
This casting method can do small or big orders. It keeps good quality. 3D printing helps with small batches.
Investment casting uses materials well. It makes less waste and saves money. This helps the environment and your budget.
Investment casting has many good points. But it can cost more and take longer than other ways. Careful planning is very important.

Investment casting process steps

Investment casting has many steps to make metal parts. KEMING uses new machines and checks quality often. Their process uses lost wax, shell mold, sand, and water glass casting. Here is how it works:

Wax pattern creation

First, workers make a wax pattern. This pattern looks like the finished part. KEMING uses different wax types. Unfilled pattern waxes give smooth surfaces. Filled pattern waxes make patterns stronger. Soluble waxes help make hollow spaces inside parts. Engineers put wax into metal molds to make patterns. They watch wax temperature and machine settings. This helps stop mistakes. Careful checks make sure each pattern is correct.

Type of Wax	Description
Unfilled Pattern Waxes	Mostly wax, gives smooth surfaces.
Filled Pattern Waxes	Has extra stuff for strength and less swelling.
Soluble Waxes	Makes hollow spaces, melts away later.
Runner Waxes	Used for channels that guide metal.
Sticky Waxes	Sticks patterns together or fixes small mistakes.

Pattern assembly

After making wax patterns, workers put them on a wax rod called a sprue. This makes a tree shape. Each branch holds a pattern. Many parts can be made at once. How they put patterns together changes the final part. Careful placement helps metal flow and fill details. KEMING uses skilled workers and good tools for this step.

Make wax patterns with dies.
Attach patterns to a sprue to make a tree.
Get the tree ready for shell coating.

Ceramic shell coating

Next, workers dip the wax tree in liquid ceramic. They cover it with sand or powder and let it dry. They repeat this to make a strong shell. KEMING uses special materials for the shell. The shell must be strong but not too thick. If it is weak, it can break. If it is thick, it may miss small details.

The shell needs the right material, low holes, and careful drying. Each layer must dry before adding another. This stops cracks and keeps the shell strong.

Dewaxing and mold formation

When the shell is dry, workers remove the wax inside. KEMING uses heat and pressure to melt the wax. Sometimes, they use quick fire or microwaves. This leaves a hollow ceramic mold. Heating the mold helps stop cracks. It also helps metal fill every detail. A clean mold makes accurate parts.

Dewaxing Technique	Description
Autoclave Dewaxing	Uses heat and pressure to melt wax.
Flash Fire Dewaxing	Quick heating removes wax fast.
Microwave Heating	Melts wax with microwaves, gentle on the shell.

Metal pouring and cooling

Now, the mold is ready for metal. Workers heat metal to the right temperature. Aluminum melts at 750–800°C. Steel needs more heat. KEMING pours hot metal into the mold. The metal fills every space and takes the wax pattern’s shape.

How fast the metal cools changes its strength. Fast cooling makes metal hard but less tough. Slow cooling makes it tough but less brittle. KEMING controls cooling for each project.

Shell removal and finishing

After the metal cools, workers break the ceramic shell. They use water jets, grinding wheels, or chemicals to clean the part. KEMING uses blasting to remove shell and smooth the surface. Engineers check each part for size and shape. They use tests like X-ray, hardness, and magnetic checks. This makes sure every part is good.

KEMING’s process uses new machines and strict checks. This makes sure each part is strong and ready for use.

Advantages of investment casting

Precision and complex shapes

Investment casting can make parts with exact shapes. It is good for making small details and tight fits. Many industries need parts that look smooth and fit well. Engineers can design tricky shapes and hollow spaces with this process. Other casting methods cannot make these shapes. Most parts need little extra work after casting.

Investment casting makes parts with fine details and tight fits.
It helps create tricky shapes and hollow spaces.
Finished parts are smooth and need less extra work.

KEMING uses modern CNC machines and checks quality often. Their team makes custom castings for each client.

Material efficiency

This process uses materials in a smart way. Workers make wax patterns that match the final part. This means less waste. The ceramic shell fits closely around the pattern. Less extra metal is needed. KEMING plans carefully and uses new machines to cut down on scrap.

Using materials well saves money and helps the environment.

Versatility for production volumes

Investment casting works for small and big orders. For small batches, engineers use 3D-printed patterns. This saves money on tools. For bigger batches, the process stays exact and needs less extra work. KEMING can handle any order size. Clients can grow their projects easily.

Works for small, medium, and big orders.
3D-printed patterns save money for small batches.
Quality stays the same for all order sizes.

Wide range of metals

This method works with many metals. It can use ferrous and non-ferrous metals. Common metals are carbon steel, stainless steel, aluminum, and zinc. Many industries use investment casting because it is flexible. In 2024, this process made up 16.60% of the casting market.

KEMING follows rules like ASTM, DIN, JIS, and AAR. Every part gets tested with X-rays and hardness checks to make sure it is good.

Limitations of investment casting

Cost considerations

Investment casting usually costs more than other methods. Skilled workers and special machines make it expensive. Tooling and materials add to the price. The process uses wax and ceramic shells, which cost more. Complex designs need more work and better technology.

Lead time factors

Investment casting takes a long time to finish. There are many steps, like making tools, testing samples, and making the parts. Each step needs careful planning and testing. The table below shows how long each step usually takes:

Processus	Typical Lead Time
Tooling design and manufacturing	4-6 weeks
Sample castings	2-4 weeks
Production	6-8 weeks

Some things can make the wait even longer. Hard parts may need more design time. New parts often need changes and more tests before they are ready.

Harder parts may need more design time.
New parts may need changes and more tests, so it takes longer.

Size and weight limits

Investment casting is best for small and medium parts. Most places make parts from less than an ounce up to 85 pounds. The biggest size is usually 24 inches by 24 inches. Some places can make parts up to 250 pounds, but most are under 10 kilograms. This process is good for parts with lots of details, but not for very big or heavy parts.

Normal weight: 1 oz – 85 lbs
Biggest size: 24” x 24”
Max size: 300mm for length, width, and height
Max weight: about 50 kilograms
Most U.S. places make parts up to 20 lbs (9.07 kg)

Potential process challenges

Manufacturers face some problems with investment casting. Making more parts can make it hard to keep quality high. Pattern making and shell building need to be exact. Special computer tools help check dipping and metal flow, which makes shells better. Automation helps work faster and saves money. Picking the right material is important, because bad alloys can ruin parts. Strong quality checks help stop mistakes. Problems can happen during dewaxing, pouring, or finishing. If wax is not removed or metal is too hot or cold, there can be defects. Watching each step closely helps stop these problems.

Manufacturers use special tools and strong checks to fix problems and make better products.

Materials and industries for investment casting

Common metals and alloys

Many metals and alloys can be used in investment casting. Each one has special features for different jobs. KEMING uses these metals a lot:

Alliages d'acier inoxydable: These do not rust and can take heat. Grades like 304 and 316 are in medical tools and car parts.
Carbon and Low-Alloy Steels: These are strong and save money. Gears and brackets often use AISI 4140 and 8620.
Alliages à base de nickel: These work well with high heat and stress. Inconel 625 and 718 are used in aerospace parts.
Alliages à base de cuivre: Bronze and brass move heat and electricity well. Plumbers and shipbuilders use them.
Alliages d'aluminium: These are light and strong. Car makers and electronics companies use A356.
Alliages de titane: These are strong but not heavy. Airplanes and medical implants use Ti-6Al-4V.
Cast Iron: This is tough and not expensive. It is good for parts that get hot.

KEMING’s team knows a lot about carbon steel, stainless steel, iron, aluminum, and zinc castings.

Automotive and transportation uses

Investment casting helps make car and truck parts that must be strong and exact. Makers use it for engine parts, brackets, and safety systems. KEMING gives castings to vehicles, buses, and trains. Their parts help lower weight and save fuel. Many transportation companies trust KEMING for good, reliable parts.

Aerospace and electronics applications

Aerospace and electronics need parts with tight fits and special shapes. Investment casting can do this job. KEMING makes parts for planes, drones, and satellites. Electronics makers use castings for cases and heat sinks.

Marine, railroad, and construction sectors

Marine, railroad, and construction need strong parts that last a long time. Investment casting gives these groups tough, smooth, and exact parts. KEMING sends castings for ships, railcars, and big machines all over the world.

Better mechanical properties
Good for tricky shapes and saves money
Smooth surfaces and very exact

Investment casting makes parts that are strong and dependable. This is why people pick it for important jobs in tough places.

Choosing investment casting for your needs

Comparing casting methods

Engineers look at different casting methods before projects. Investment casting makes parts with lots of details. Sand casting is good for big parts but misses small details. Die casting makes many parts fast but uses fewer materials. KEMING offers lost wax, shell mold, sand, and water glass casting. This gives customers choices. Each method is good for certain jobs. Investment casting is best for accurate parts with smooth surfaces and less extra work.

Project suitability factors

Picking the right casting process depends on a few things. The table below shows what to think about:

Facteur	Description
Cost of Tooling	Fewer parts can make tooling cost more for each part.
Size Limitations	Investment casting works best for small and medium parts.
Internal Shapes	Deep or tricky inside shapes are harder to make.
Timing	This process takes longer but needs less extra work.

Teams should check part size, shape, and how many they need. They should also think about when they need the parts. Investment casting is best for projects that need exact shapes and smooth finishes. KEMING helps customers look at these things to pick the right method.

How to start with KEMING

It is easy to start a project with KEMING. Customers send their CAD files on KEMING’s website. The team checks the design and sends a price in 24 hours. They also give a DFM analysis to help make the part better. When the customer says yes, KEMING starts making parts with CNC machines.

KEMING’s team helps customers at every step. They answer questions fast and keep clients updated. After making the parts, KEMING shares packing details and sets up delivery by sea or air. This process makes sure each project goes well from start to finish.

Investment casting makes very exact parts with smooth surfaces. Many industries use it because it is flexible. There are some limits on size and cost. But this process makes detailed parts that other methods cannot make. KEMING uses new machines and checks quality carefully. They also give quick help to customers.

Each project is different. KEMING helps customers pick the best casting method. You can contact KEMING to begin your custom casting project today.

FAQ

What is investment casting used for?

Manufacturers use investment casting to make metal parts with special shapes. Many industries, like cars, planes, and electronics, pick this process. They like it because it makes parts that are very exact and smooth.

How does KEMING ensure quality in castings?

KEMING checks each part with tests such as X-ray and hardness. They also use magnetic particle inspection. The team uses advanced CNC machines and follows world rules.

Tip: Testing often helps stop problems and keeps parts strong and safe.

Which metals can be cast using investment casting?

Investment casting works with many metals. Some common ones are carbon steel, stainless steel, aluminum, and zinc. Each metal is good for different jobs.

Metal	Common Use
Acier inoxydable	Medical tools
Aluminium	Électronique
Acier au carbone	Automobile

How do customers start a project with KEMING?

Customers upload CAD files on KEMING’s website. The team looks at the design and sends a price in one day. After the customer says yes, production starts.

Step 1: Upload CAD file
Step 2: Get a price
Step 3: Say yes and start making parts