Email:hhcasting@126.com

Contact Us

Manager:Franck

Mobile: +86-13665102324

Email: hhcasting@126.com

Skype: hoohi123

Tel: +86-510-85737583

Japanese Market:Tong san

Mobile: +86-13814297500

Email: 13814297500@163.com

Lost Wax Casting

Custom China lost wax precision aluminium die casting parts mass production

FAQ: 1. How to get a quotation? Please send us drawings in igs, dwg, step etc. together with detailed PDF. If you have any requirements, please note, and we could provide professional advice for your reference. 2. What if we do not have drawing? Samples would be available, and we would send you...


Process

lost wax casting, precision casting, Investment Casting, Silicon sol casting,

Material

Aluminum, Stainless Steel, Carbon Steel, brass, iron, ductile iron

Material Grade

GB, ASTM , AISI , DIN , BS,

Weight

0.01 kg~120kg

Accuracy

Class CT4~CT7

Surface Roughness

Up To Ra1.6~Ra12.5

Applied Software

proe, catia, ug, solidworks, cad, pdf, etc

Production Capacity

More Than 100T Per Month

Heat Treatment

Anneal, Quenching, Normalizing, Carburizing, Polishing, Plating, Painting, etc

Machining Equipment

CNC Center , CNC Machines, Turning Machines, Drilling Machines , Milling Machines, Grinding Machines, etc

Measuring Tool

CMM , Projector, Vernier Caliper, Depth Caliper, Micrometer, Pin Gauge, Thread Gauge , Height Gauge, etc

QC System

100% Inspection Before Shipment

Report

100% Report with shipment

Transport

Air or Sea


FAQ:

1. How to get a quotation?

Please send us drawings in igs, dwg, step etc. together with detailed PDF.

If you have any requirements, please note, and we could provide professional advice for your reference.

2. What if we do not have drawing?

Samples would be available, and we would send you drawing to confirm.

Of course, we would ensure the safety of the drawing.

3. How to pay?

For small quantity, we could provide Paypal, Paypal commission will be added to the order.

For the big one, T/T is preferred.

4. How to ship?

For small quantity, we have cooperation with TNT, FEDEX, UPS etc.

For big quantity, air or sea would be available for you to choose.

5. What about the packing details?

We attached our normal packing details.

If you have any special requirements, we would be willing to help.

6. What about the delivery time?

It would be 20-30 days normally for the parts to be ready and we had a system to ensure the time.

When you made your order, you would know.

Investment casting process 

Step 1: Mould engineering & production

With precision investment castings, the first step involves the engineering and production of a mould also known as a wax tool. Moulds are made from aluminum or steel. This mould is developed in-house by hoohi engineers and serves as a negative of the final casting. It is important that the mould is made accurately, so that the required tolerances and surface roughness can be achieved. Depending on the size of the series, the mould is installed either onto a manual or automated press.

Step 2: Wax model spraying & Tree building

The mould is filled with liquid wax. After the wax has been cooled down, ejectors in the mould push the wax model out. A wax model has now been sprayed which is identical to the final casting. These wax models are glued onto a so-called wax tree with a casting funnel on top, into which steel is poured in a later stage of the process

Step 3: Rinsing the wax trees

After the wax models have been glued onto a wax tree, they are rinsed. Any possible contaminations on the surface are removed to ensure a successful attachment of the ceramic onto the wax tree.

Step 4: Building ceramic layers

After rinsing the wax tree, the tree is given a fireproof ceramic shell. This shell is constructed after repeatedly submerging the tree (up to 7 or 9 times) in a slurry and sprinkling it with ceramic sand. The ceramic layers are then hardened in a drying chamber where they are exposed to air.

Step 5: Autoclave

After the layers have been formed and dried, the wax is melted out of the ceramic tree by using steam (120°C) in an autoclave. This is why it is called “lost wax casting”. The majority of the molten wax can be regenerated and is reusable.

Step 6: Sintering

The ceramic tree is then baked (stoked) at temperatures of around 1100°C and reaches its final strength through the sintering process. Any wax remains are burned out during this process.

Step 7: Casting

The desired steel alloy is melted in a large furnace and brought to cast temperatures. The ceramic tree is, at the same time, heated in an oven to prevent thermal shocks during the pouring process. After the tree has been heated, it is removed from the oven by a robotic arm and filled up with a steel alloy by use of counter gravity. When the trees have been poured, they are placed on a cooling conveyor where they are cooled down. (with nitrogen).

Step 8: Ceramic removal

The trees are then removed from their ceramic shell by using a fully-automatic hammer to break the shell. This removes the majority of the ceramic. The next step is to cut the products from the trees by sawing or vibrating. The steel leftovers will be sorted based on alloy and can be melted again during the next casting session

Step 9: Blasting

The Finishing Department removes the last pieces of ceramic by means of steel, sand and/or water blasting.

Step 10: Grinding

The ingate which remained after the sawing process, is grinded from the casting. To grind the product properly, a grinding fixture is often applied.

Step 11: Visual inspection

The Quality Department checks all products visually for possible casting failures. This check takes place according to a quality standard sheet to ensure that all possible surface failures are corrected properly. Thanks to this procedure, you can be assured that hoohi only delivers high quality castings.

Step 12: Machining

hoohi has the capabilities to machine castings in house, such as drilling holes, tapping threads and turning & milling activities. This enables hoohi to deliver a completely machined component that is ready-to-install.

Step 13: Heat and- or surface treatment

Some alloys require heat treatment to achieve a certain hardness, tensile strength or elongation according to 2D drawing specifications. The standard heat treatments are performed in-house, the complex treatments are outsourced. hoohi also has the know-how to perform a surface treatment for a casting. Surface treatments involve the coating process of a steel surface, to enhance the looks of the surface or protect it against external influences such as corrosion (rust) and natural wear (damage).

Step 14: Final inspection

The final step in this process is another visual check and when necessary composing a measurement report and material analysis. After the final inspection, the products are ready for shipment to another satisfied Hoohi customer.

Investment Casting Advantages and Disadvantages

When it comes to getting the parts you need for whatever product you are manufacturing, there are a variety of processes that can be utilized. With all of the options available, it’s important to know which will produce the best quality part at the most cost-effective price.

ppcp investment casting partsInvestment casting allows for a quality end product and rapid turnaround, not to mention offers an array material, sizes and configuration options. This may be the best choice for your casting need. But before making your decision, here are some of the advantages and disadvantages of the process to help you better discern if it’s the right option.

Advantages of Investment Casting

There are some big advantages of using investment casting to get the piece you desire. One such advantage is that it is possible to make more intricate forms—even forms with undercuts. Also, the casting that is produced has a very smooth surface, which is created without a parting line—something that would be unavoidable in some other processes.

investment casting partThe accuracy of investment casting is second to none. Even parts with the highest precision can be cast with little to no machining or detailing required. And since the finished piece will need no welding or assembling, you save on time and cost that would be required using other methods.

Since new alloys have been developed that allow for more complex parts to be cast, the process of combining several parts together to get the intricate shape can be eliminated. This not only saves time and money, but it also diminishes the chances that an error could occur while combining the parts.

Perhaps one of the biggest advantages of investment casting is that it is possible to produce a very wide variety of products across different industries. This versatility is a definite plus over other casting methods that either have difficulty producing some designs or cannot produce them at all. Also, many different metals and alloys can be used in investment casting, diminishing the need for designers to worry about the production of the casting they have visualized.

An example of a larger-sized product that can be made using investment casting is turbine blades with complex shapes for power generation industries. The blades can be single-crystal, directionally solidified, or conventional equiaxed blades. The firearm industry is another example of where investment casting is used, but for smaller precision parts. Some of these parts include firearm receivers, triggers, and hammers.

Disadvantages of Investment Casting

There are, however, some disadvantages to investment casting. One of the biggest disadvantages is size limitation. Usually, only smaller castings (up to about 250lbs) can be made using this process. There have been situations where it has been used to produce somewhat larger parts like aircraft door frames or heavy steel and aluminum castings, but for the most part, those interested in using this process should stick to smaller, more complex pieces.

Another downside is the initial cost. Although investment casting saves on cost in a variety of ways, prep work can be labor-intensive compared to other methods. The preparation of the wax patterns and shell molds require much time and effort to ensure a quality product.

On a similar note, large machinery is required for this process, and when extremely high-volume manufacturing is desired, the associated costs and longer cycle times can make investment casting a less-suitable option depending on your needs and deadlines.

Another inconvenience that you can run into with investment casting is the use of holes in the mold. They cannot be smaller than about 1/16 of an inch and usually cannot be any deeper than about 1.5 times the diameter. So if these limitations don’t suit the design of the casting, then another process may need to be used.

When trying to determine which method is best for your part production, take into account both the advantages and disadvantages that come with utilizing lost wax investment casting. In the end, it often comes down to the type of part you need produced. Overall, when larger and heavier parts are desired, it may be a good idea to look into other methods. But if you’re looking to make a smaller, more intricate and complex piece, then investment casting could be the choice for you!



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