Precision casting automotive parts

Precision casting automotive parts

Precision casting valve parts

Precision casting valve parts

Precision casting handle casting

Precision casting handle casting

Precision casting medical equipment parts

Precision casting medical equipment parts

Precision casting pipe parts

Precision casting pipe parts

Precision casting faucet components

Precision casting faucet components

Save Your Time?
Send us your requests directly

What is precision casting?

What is precision casting

Precision casting, also known as investment casting, Lost wax casting, is a manufacturing process that allows for the creation of complex and intricate metal parts with a high degree of accuracy and precision.

With precision casting, it’s possible to create parts with tight tolerances, fine details, and smooth surface finishes. These parts can be used in a wide range of applications, including aerospace, automotive, medical, and industrial equipment.

Some examples of components that can be made using precision casting include turbine blades, engine parts, gears, and dental implants.

Get a Quote

How we Manufacture Precision Casting Parts?

Precision casting mold

Mold design

Unless precision casting is being used to produce a very small volume (as is common for artistic work or original jewelry), a mold or die from which to manufacture the wax patterns is needed.

Precision casting wax prototype

Creating a wax prototype

Also called wax pressing or wax injection, it is the process of making wax molds through wax pressing machines and molds. The shape of the wax piece is the shape of the casting product after casting.

Precision casting tree

Assemble wax patterns tree

Assemble the wax patterns to a gate or system. Multiple patterns are assembled to allow for large quantities to be produced at one time. See if it looks like a tree upside-down. Making it is easy to do shelling.

Precision casting shell Creation

Ceramic shell creation

If the product is relatively large and the mold cavity space is large, the thickness of the mold shell needs to be increased. Otherwise, failure to bear the pressure during pouring will cause shell explosion.

Precision casting wax removing

Removing the wax

Set the temperature to 175 ℃. Generally, it takes 8-10 minutes to reach the set temperature, then open the air inlet valve and drain the wax from the wax outlet below. The discharged wax will pass through the filter screen and then go into the wax recovery machine for dehydration and degreasing to realize recovery and reuse.

Precision casting process

Doing casting process

Usually this process is done at midnight. The ceramic mold is preheated and then pouring the melted metal liquid into the baked ceramic shell mold, then put them fast but carefully on the sand base to let them cool down. It will takes about 6 hours to wait them cool down. Then send them to shell removing workshop.

Precision casting shell removing

Removing the shell

Break the ceramic shell with shaking machine. There maybe a lot of NOK parts since they are not that precision or because of leaking shell. About 70% of precision casting defected parts are found in this process and will be recycled of cause. Some of them may be OK for casting again while most of it Not.

Precision casting grinding

Grinding and finishing

This process allows for high precision casting and quality in the final product, making it a popular choice in various industries. Workers will check carefully one by one. Use small hand grinding machine to modify them. Ensure no burrs or shape edges all over it. After this, final products will be sent to QC and packing.

In the video left, you can follow the camera to find out how we produce precision casting stainless steel faucet fittings. For most of the cases, precision casting parts request post treatment too. After finishing the casting processes, we can also offer CNC machining, surface coating, assembly or additional test service, etc. 

contact us for more

Subsequent processing after casting

Customized Machining Service

For manufacturers in some industries, including but not limited to Medical, Automotive, Aerospace,  Elevator, Jewelry, and Optic, their products usually request custom Machining, such as CNC machining, drilling, milling, grinding and lathing even after precision casting. we have great experience and equipment to precisely machine tight-tolerance casting parts and components. We offer customized Machining service with ISO 9001 certified and ITAR registered to exceed rigorous standards and unique demands, all while ensuring rapid production, top-notch quality, and cost efficiency.

Machining Quality & Certifications


  • IAF 16949 / ISO 9001:2015 certified
  • 99.9% on time delivery and Average 7 days turnaround machining time
  • wide range options of machining materials
  • Multiple options of machining technology: CNC Machining, Lathing, Drilling, Milling, Grinding and Welding etc.
  • Specialized in machining precision casting parts.
precision casting-machining service-1

CNC Machining Materials

Aluminum 2024, 5083, 6061, 6063, 7050, 7075, etc.
Copper Alloy brass 360, 101 copper, 110 copper, 932 bronze, zinc, etc.
Titanium Alloy grade 2, grade 5, etc.
Stainless Steel 303, 304, 410, 17-4, 2205 Duplex, 440C, 420, 316, 904L, etc.
Superalloy Kovar,Hastelloy,Inconel,monel,etc
Zinc Alloy 3#,6#,9# etc.,
Engineering Plastic POM (Delrin), ABS (Acrylonitrile Butadiene Styrene), HDPE, Nylon, PLA,
PC (Polycarbonate), PEEK (Polyether Ether Ketone), PMMA (Polymethyl Methacrylate or Acrylic),
PP (Polypropylene), PTFE (Polytetrafluoroethylene), etc.
Other Other CNC machining materials: Graphite, VeroClear

Machining Capabilities

  • CNC Lathing and Milling Machine
  • CNC Swiss Turn by Tsugami
  • High Speed Drilling-Tapping Machine
  • MAZAK 5 Axis Turning-Milling Machine
  • CNC Milling Turning Centers
  • Multi Spindle Cam Automatics
  • CNC Swiss Turning Machine 
  • DMU 5 Axis CNC Machine

Advantages of precision casting

Precision casting, has several advantages over other traditional manufacturing processes, including:

Apart from the above typical advantages, there are some other points worth to consider. Such as Cost-effective for small production runs: Precision casting can often be more cost-effective than other methods for producing small to medium-sized production runs of complex parts. And reduced machining time: Precision casting produces parts that require less machining, resulting in faster lead times and lower costs. 

These advantages make precision casting an attractive option for various industries, including aerospace, medical, automotive, and industrial equipment.

Dimentional Tolerance of Castings

Dimentional Torlerance of CastingsCasting dimensional tolerance refers to the allowable limit deviation of the size of each part of the casting. Many factors in the casting production process will affect the casting dimensional tolerance. At the same time, the casting dimensional tolerance will have a great impact on the casting production cost within a certain range. Therefore, scientific methods must be adopted. standards to coordinate the requirements of both supply and demand parties.

In China, casting dimensional tolerance standard GB/T 6414-1999 "Castings Dimensional Tolerances and Machining Allowances" is equivalent to ISO 8062:1994 "Castings Dimensional Tolerances and Machining Gold System". This is the basis for casting process design and inspection of casting dimensions. It specifically stipulates the dimensional tolerances of various casting alloys produced by sand casting, metal mold casting, low pressure casting, pressure casting, investment casting and other methods, including the basic dimensional tolerances of castings. Difference value, wrong type value. The tolerances stated are those normally achievable under normal production conditions. It is divided into 16 levels from fine to coarse, named CT1 to CTI6.

The standard also stipulates the dimensional tolerance levels of castings produced in batches and mass production , small batches and single pieces  for easy selection. and for casting dimensional tolerance values.

Tolerance classes for mass-produced rough castings (GB/T6414—1999) (ISO 8062:1994)

Casting Method Tolerance CT
Casting Material
Cast Steel Cast Iron Ductile Iron Malleable Cast Iron Copper Alloy Zinc Alloy Light Metal Alloy Nickel Based Alloy
 Handmade Sand Casting 11-14 11-14 11-14 11-14 10-13 10-13 9-12 11-14
Machine Moldeling Sand Casting 8-12 8-12 8-12 8-12 8-10 8-10 7-9 8-12
Metal Mold Casting or Low Pressure Casting   8-10 8-10 8-10 8-10 7-9 7-9  
Die Casting         6-8 4-6 4-7  
Investment Casting Water Glass 7-9 7-9 7-9   5-8   5-8 7-9
silica sol 4-6 4-6 4-6   4-6   4-6 4-6

How to choose a precision casting manufacturer?

When choosing an precision casting foundry, there are several factors to consider:

1. Quality: A reputable manufacturer will have quality-control measures in place to ensure that every part produced meets the required specifications and standards. Choosing a manufacturer with a track record of producing high-quality parts can help reduce the risk of defects, rework, and other issues.

precision casting foundry corner

2. Capacity and capabilities: A manufacturer’s capacity and capabilities can have a significant impact on lead times, production runs, and costs. It’s crucial to choose a manufacturer that has the equipment, personnel, and expertise to meet your requirements.

3. Material selection: Different manufacturers may have varying levels of experience and expertise with different materials, alloys, and processes. Choosing a manufacturer with experience in the type of material you require can help ensure that you receive high-quality parts.

4. Manufacturing process: Precision casting involves several complex steps and requires careful attention to detail at each stage of the process. Choosing a manufacturer with a proven manufacturing process can help ensure that your parts are produced efficiently, reliably, and with consistent quality.

5. Communication and service: Working with a manufacturer that offers excellent communication and customer service can help ensure that your needs are being met throughout the entire production process. This includes clear and timely communication about lead times, production status, and any issues or concerns that arise.

Popular applications of precision casting

Precision casting, can be used in a wide range of applications where high precision and complex shapes are required. Some common applications of precision casting include:

Automotive casting: 

Precision casting is used to produce engine components, transmission gears, and other parts for automobiles, trucks, and motorcycles.

precision casting manufacturers 15

Medical equipment:

Precision casting is used to produce medical instruments and implants, such as dental implants, joint replacements, and surgical tools, where accuracy and biocompatibility are critical.

precision casting manufacturers

Aerospace and defense industry:

Precision casting is used to produce complex parts for jet engines, missiles, and other aerospace and defense applications that require high strength and reliability.

precision casting manufacturers 20

Other Industrial manufacturing:

Precision casting is used to produce high-quality components for machinery, pumps, valves, and a wide range of other industrial applications.

precision casting manufacturers 16

Overall, precision casting offers many advantages over other manufacturing processes, including high accuracy, versatility, and cost-effectiveness.

What Clients Said

Hear from Honored Clients

At Sipx, where customer satisfaction is our major priority. Here is what some of our customers have said about our products and services.

Chapter 1

Precision casting shell making process

At present, there are four widely used shell making processes in the production of precision castings in China:

1.1. Low temperature mold material water glass shell

This process has a production history of nearly 50 years in China. The advantages of the water glass brightening process are: low shell making cost, short production cycle, and convenient sand cleaning. The disadvantage is: Na The O content is high, and the high-temperature strength and resistance to deformation of the shell are not as bright as those of the silica sol mold. The surface roughness, dimensional accuracy, yield, and repair rate of the casting are all worse than the other three shell making processes.
The production equipment for water glass shell is simple, the environmental conditions are poor, the labor intensity is high, and the refractory materials for the surface and back layers are of low quality and low price. Chemical hardening such as chlorination is used, so the cost-effectiveness of castings is relatively low

Improvement direction:

a. Using silica micro powder (sand) with high silicon dioxide content instead of silica powder (sand) with low silicon dioxide content, SiO. The content requires a standard of 99.5%, and the particle size of the surface layer powder requires a bimodal gradation. The surface layer coating is prepared with a density of 128g/cm water glass fiber, and the powder to liquid ratio reaches 1.4:1

b. To strengthen the on-site quality management of the shell making process, the first priority is to separate the shell making operation site from the shell drying room in the newly designed pouring system shown in Figure 2-79. The dust removal and shell making equipment in the operation site should be increased as much as possible, and the environmental temperature and humidity in the bright drying room should be improved as much as possible.

1.2.  Low temperature mold material silica sol water glass composite shell

The first layer or the first and second layers use English powder slurry, while the micro English sand back layer still uses water glass technology. The advantage is that the surface roughness of the casting is R. As the value decreases, the surface defects of castings are reduced, and the repair rate is reduced.

High alloy steel parts such as stainless steel and heat-resistant steel can be poured, and the production cycle of shell making is much shorter than that of the all silicon adhesive process, and slightly longer than that of the water glass process. The cost-effectiveness is higher than that of water glass process and lower than that of all silica sol process. The disadvantage is that the composite process can only be considered an improved version of the water glass process, and fundamentally belongs to the category of water glass shell making. The overall high-temperature strength, creep resistance, and dimensional accuracy of the shell are far inferior to those of the silica sol shell: the roasting temperature of the composite shell cannot exceed 950C, and the roasting principle from low to high temperature must be followed.

It cannot be directly entered into the roasting furnace at 1000-1200C. Due to the low roasting temperature and insufficient insulation time, it often causes defects such as porosity, insufficient pouring, and cold shut in the casting. Castings with a wall thickness of less than 3mm are difficult to apply, The production of small and extra small castings weighing less than 50g will further expose the weaknesses of the composite process. The overall quality stability is poor. Compared to the silica sol process, the cost advantage of shell making is not very significant.

Improvement direction:

a. Improving the surface quality of castings does not necessarily require the use of incorrect powder and sand. For low-temperature molds, relatively high purity silicon powder and silica sand can be used. Production practice has shown that quartz silica sol slurry can replace incorrect sand silica sol slurry.

b. Strengthen the quality management and environmental improvement of the back shell production. The back layer should use refractory materials with stable quality, excellent high-temperature performance, and relatively low cost, while also taking into account the compatibility with the expansion of the surface layer shell refractory material. For example, the back layer should use refractory clay quartz powder coating (50% each) and sprinkle granular sand. Alternatively, use fire-resistant clay particle powder coating (3:7) and sprinkle granular sand.

1.3.  Low temperature mold material all silica sol shell

The low-temperature mold material all silica sol process has higher quality than the composite shell, especially with high dimensional accuracy and strong creep resistance. It can be applied to thin-walled parts, complex structural parts, and small and medium-sized parts, especially in the production of medium and large parts weighing over 5kg. Do not use high-pressure wax injection machines, as the equipment investment is low and the surface quality of wax molds is not significantly different from that of medium temperature wax molds. This is the biggest advantage of this process.

Improvement direction:

a. Emphasis should be placed on strengthening the treatment of recycled wax. In the first step, 3%~5% hydrochloric acid should be heated to boiling to ensure sufficient boiling time to completely remove saponification substances. The second step is to have sufficient settling time for the wax solution. The second step is to filter the wax solution through multiple filters after sedimentation treatment. The fourth step is to regularly measure the acidity of the mold material and supplement it with stearic acid in a timely manner.

b. By using steam dewaxing method, the steam pressure is only 0204MPa and the temperature is only 120130C, which can meet the requirements.

1.4.  Medium temperature mold material all silica sol shell

It is an internationally recognized precision casting production process, which has the highest casting quality, the lowest repair rate, a surface roughness value of R083.2, and a dimensional accuracy of CT3~CT5. It is suitable for making small and extra small parts, with less production of 10~50kg large parts. Of course, the production cost is also the highest, and the equipment investment is also the highest.

Improvement direction:

a. Adopting the surface layer blowing and rapid drying process, vacuum drying, and quick drying silica sol methods to shorten the shell making time and cycle.

b. Corundum or fused silica and other surface refractory materials are used to replace quartz, reducing the cost of surface layer shell making. To solve the problem of high residual strength of shell, it is recommended that 50% mullite powder+50% quartz powder mixed slurry be used for the back layer powder, and still sprinkle mullite.

At present, some shell making processes in Chinese precision casting factories only use one type of shell, some use two types of shell making processes, and there are also four types of processes available to fully meet the different market demands for quality and price of precision castings, and improve the competitiveness and adaptability of enterprises in the market.


Precision casting can be used with a variety of materials including metals like steel, aluminum, and titanium as well as alloys such as brass and bronze.

Precision casting offers advantages over other manufacturing processes such as machining, forging, and stamping as it allows for better accuracy, smoother surfaces, and complex shapes can be produced with ease.

Industries like aerospace, defense, medical, automotive, industrial manufacturing, and jewelry-making use precision casting as it allows them to produce high-quality components with intricate designs.

We make precision casting parts according to clients drawings or samples. Faucets fittings, valve settings, automotive spare parts are common made in our foundry.

We used stainless steel 304,304L,316,316L,410,416 and 17-4.

The steps involved in precision casting include creating a wax model or pattern, dipping the pattern in ceramic slurry, burning out the wax to create a mold, pouring the molten metal into the mold, and removing the finished part from the mold.

Parts produced using precision casting have very high dimensional accuracy with a tolerance range of 0.001-0.005 inches per inch of part dimension.

The production capacity of our precision casting foundry can produce 50000pcs per month.

We meet the ISO8062(GB/T6414) CT4-CT8 of Nominal dimension (mm) Linear dimension tolerance

Precision casting contact box