Tlpcasting is Investment Casting Manufacturer from China
Weight: 5g – 50kg
Capability: 150 ton per month
Machining tolerance: +-0.01-0.03mm
Surface Roughness: 6.4 Ra um/ 254 Ra uinches
1)less than 100g 1000 pcs
2)100g-200g 500 pcs
3)More than 200g 200 pcs
Investment Casting Case
Tight tolerance: generally up to CT4-6 (sand casting is CT10-13, die casting is CT5-7)
Surface finishes: generally up to Ra.1.6~3.2μm.
What is Investment Casting?
Investment casting can also refer lost-wax casting. Investment casting has more than 5,000 years in numerous forms. There are two main investment casting methods, silica sol investment and water glass investment. In addition, The silica sol investment casting costs more but has the better surface than the water glass method.
The investment castings involves creating an original wax pattern, coating layers of plaster and building of successive layers until a strong shell envelopes the model.Then, melted material is poured into the mold, creating an exact duplicate of the desired part.
Investment Casting Process
1. Create wax pattern
The process replicates wax patterns as same as the finished part by injecting wax into a metal injection die.
The next step is to assemble wax pattern onto gate and runner to improve production efficiency.
3.Create the mold shell and set and dry
To build a firm and solid ceramic shell, the finished tree is dipped into a ceramic slurry with couples of layer. Some parts require four and half layers of coating, some require five or six layers depending on size and shape of parts.
The wax inside is melted away by steam autoclave.
After dewaxing, the high temperature operation also strengthen the shell and increase stability, which also minimize the possibility of problem during pouring.
5.Baking and Casting
The molten metal is poured into the pre-heated mold cavity.
Waiting the mold cools to the room temperature and fully solidify.
The shell material is removed through processes hammer knockout and vibration.
The individual parts are cut off from the gating and runner system.
Applications of Investment Castings
The investment castings parts could be applied to medical equipment, food service, beverage industry, power generation, automotive, aerospace, gas and oil and energy industries applying other precision parts.
For example, the gas and oil industry turns to cast parts for impeller, valves and fittings. Investment castings are even used by truck spare parts in transportation industry.
Advantage of Investment Casting
- high dimensional accuracy and surface finish, so it can reduce the machining work, leave a little machining allowance in the parts with higher requirements, or even some castings only leave polishing and polishing allowance, and can be used without mechanical processing. It can be seen that the investment casting method can save a lot of machine tools and processing time, and greatly save metal raw materials.
- cast a variety of complex shapes, high precision alloy casting, especially high-temperature alloy casting. For example, the blades of a jet engine, with its streamlined shape and cooling chamber, are difficult to form by machining. It can realize mass production and ensure the consistency of casting.
- low initial tooling costs, investment casting tools generally have a lower cost than other averaged casting process.