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What is investment casting？Use a mold to shoot wax to make a wax pattern in the shape of a spare part; then apply it with a refractory material, then heat to remove the wax in the middle; then use it as a mold shell and inject molten metal iron. Wax casting (also called investment casting, lost wax casting). This casting method is extremely cost-effective when used to manufacture products such as complex and three-dimensional shapes.

1) Drawing
First of all, it is necessary to fully discuss various conditions such as the concept, purpose, and size of the product. In order to produce a product that pays attention to product economy and operability, it is necessary to conduct thorough communication and negotiation in all aspects such as shape and material.

2) Mold making
Secondly, the mold making of the forming wax mold is based on the pre-agreed design drawings, and the mold design of the neutron is carried out to improve the efficiency and reduce the cost.

3) Wax mold making
Wax is injected into the mold to make a wax pattern. The shape of this wax mold solidifies into the shape of the casting.

4) Group tree
The wax module of the product is welded to the casting rod and assembled like a branch, this state is called a group tree. Multiple castings can be produced at one time.

5) Shell making
The assembled wax mold is dipped into the slurry (binder), and the surface is coated with refractory material and allowed to dry. This operation is then repeated until it finally reaches a suitable thickness.

6) Dewaxing
The shell is heated with high temperature and high pressure steam, and the wax in the prototype of the product is dissolved and flowed out. The melted part becomes the cavity, which becomes the base of the shell.

7) Roasting
The firing of the shell is to improve the strength of the shell. In addition, it also has the effect of removing impurities in the shell by heat.

8) Casting
Dissolved metal steel water is injected into the fired mold.

9) Vibration shell cleaning
After casting, the outer shell is removed by sand cleaning of the vibrating shell, and the casting containing the casting rod product is taken out.

10) Cutting
The casting of the product is removed by laser cutting from the casting rod, and a prototype of the casting is completed at this stage.

11) Heat treatment
After heat treatment, the mechanical properties of the casting products are adjusted to achieve suitable properties.

12) Check
Inspection of appearance, shape, size, and inspection of casting defects are carried out. In addition, depending on the product, mechanical
Workmanship, surface treatment and other requirements.

13) Packing for delivery

The vacuum casting china technology which uses prototype  (SLA laser rapid prototyping piece, CNC products) to make silicone mold under vacuum, and is poured under vacuum conditions, such as PU, ABS, etc. Vacuum casting is also used to clone the prototype or copy the piece. It has different types including vacuum mould casting, vacuum pressure casting, vacuum sand casting and so on. This method is especially suitable for small batch production. It is a low-cost solution to solve experimental production and small batch production in a short time, and can also meet the functional test proofing of some structurally complicated engineering samples.

Vacuum Casting Process

1. Make a silicone mold by using the master made by CNC machining and 3D printed.
2. Put the silicone mold into the vacuum molding machine.
3. Inject liquid epoxy resin and heat to cure.
4. After the curing is completed, take out the same part as the Master from the silicone mold, and one silicone mold can be used for 20 times.

China Vacuum Casting is suitable for small batch production, which can greatly reduce production costs, increase production efficiency and shorten the construction period.

Applications for Vacuum Casting

It is mainly used for product copying and mold making in various industries.

Vacuum Casting Materials

We offer a wide range of material options: ABS, PP, PC, PMMA, POM, high temperature resistant materials, soft rubber, silicone rubber, etc. Varieties of materials are available to make silicone molds comparable to injection molded parts. The following pictures are rubber, PC-like material, ABS-like material, POM-like material and transparent material.

Advantages of Vacuum Casting

The cost is low and the production cycle of the product is relatively short. Less waste and processing costs are much lower than CNC machining and 3D printing.

It is suitable for the processing and production of small batch products. After making an original version, it can be copied according to the original version, and the production efficiency is high.

Good mold operation. The soft molds after curing are all transparent or translucent, have good tensile strength, and are easy to cut and shape.

The probability of processing failure is small. As long as there is no problem with the original, the copy will naturally not go wrong.

Good repeatability. The silicone for molding has good fluidity before curing, and the fine structure and decoration of the model can be accurately maintained with vacuum defoaming.

We have the world's most advanced vacuum casting equipment, and provide post-processing lines such as polishing, painting and assembly. We can provide small batch production of small and medium-sized parts quikly. If you are looking for reliable vacuum casting service, please contact our professional team at info@duchgroup.com or contact us by visiting our website, we will provide quotes and suggestions free of charge.   

Duch Group Provides customers with competitive solutions such as china prototyping, mass production, small batch production, 3D printing, mold making, and injection molding. With more than 20 years of extensive production experience in the rapid prototyping industry, it is the world's largest rapid prototyping service company.

1. High precision and Intelligent manufacturing

It adopts Germany imported Rietschle vacuum pump, ultimate vacuum to ensure complete defoaming; the inner tank selects 5mm thick stainless steel plate to effectively prevent rust and easy to clean; specially selects the aviation plug connection line and uses imported sealing glue to effectively guarantee Equipment is airtight.

2. Low cost and high efficiency

Using a rapid prototyping part or a CNCed model as a master mold, a high-strength silicone mold is produced under vacuum, then to clone the same replica as the prototype. A silicone mold can replicate about 20 products. The processing speed is more than ten times that of CNC, the processing cost is as low as ten or even dozens of times compared with CNC, which greatly improves production efficiency and greatly reduces the development cost, cycle and risk of direct tooling.

3. Small batches production for big size parts

The mold size is up to 1500mmX 1200 mm X 1200 mm, which can efficiently realize the copying of large complex workpieces in small batches production, help to examine the appearance and structural performance of the products, and avoid the risk of direct tooling.

4. Excellent mold operation

The soft molds after solidification molding are all transparent or translucent, have good tensile strength, and are easy to cut and shape.

5. Personalized customization

According to the specific application requirements of the customer, it provides multiple configuration customizations such as vacuum pump configuration, liner material, and operation mode (automatic/manual).

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With our automated vacuum casting system, you will get free access to equipment usage training, 3D printing prototype production training, post-treatment process solutions, and lifetime technical support to help optimize production and maximize profit.

Duch Group Provides customers with competitive solutions such as rapid prototyping china, mass production, small batch production, 3D printing, mold making, and injection molding. With more than 20 years of extensive production experience in the rapid prototyping industry, it is the world's largest rapid prototyping service company.

Material Description: Acrylic plastic is commonly known as plexiglass, resistant to outdoor aging. It has excellent light transmission and good surface finish, and can print transparent and translucent products with certain strength requirements.

The disadvantage is that the surface hardness is slightly lower and it is easy to scratch.

Application: Widely used in automotive lighting signs, door glass and lamp glass covers, also be used to model teeth for orthodontic treatment. Suitable for parts with transparent insulation and low strength requirements.

Production process: Injection Molding, CNC Machining, Pmma Injection Molding