Mold Making
The mold used for stainless steel lost wax casting is mainly designed for injecting wax patterns. They are the same dimensions as final stainless steel castings. To ensure the quality of wax patterns, the mold must have high dimensional accuracy and a small surface roughness value. Normally, stainless steel casting companies choose aluminum alloy as the mold material. Compared to other suppliers, our foundry selects aviation aluminum as the mold material. But other stainless steel casting factories just use normal aluminum to save cost.
Contact us to discuss your requirements of oem stainless steel lost wax casting factory. Our experienced sales team can help you identify the options that best suit your needs.
Wax Pattern Injection
Press the treated wax paste into the mold cavity, take it out after the ice water is condensed by the ice water machine, put it into the pool for a period of time, and get a single wax pattern after dressing and inspection. Wax pattern can be understood as a die-cast part.
Wax Pattern Reparing
The quality of wax patterns will directly determine the quality of final stainless steel castings. So, the wax patterns workshop needs to be controlled with constant temperature, minimize the deformation of wax patterns. Meanwhile, inspect the surface quality of each wax pattern, for those wax patterns with burrs, flash, and parting line, they need to be repaired.
Tree Assembly
After wax pattern repairing, to improve the productivity of qualified wax patterns, a single wax pattern is fused and welded on the pre-made casting system to form a wax pattern assembly. Generally, 2 ~ 80 wax patterns can be welded on one wax module. The tree-forming scheme determines the yield of products and the utilization rate of molten stainless steel. The tree-forming scheme should be carefully considered when designing, and it should be also considered whether the tree-forming scheme is convenient for the recovery and reuse of wax should.
Wax Pattern Clearing
After standing for more than 45min, the wax modules behind group trees can be cleaned. Before making shells and hanging slurry, the wax modules after group number must be cleaned to remove wax crumbs and grease on the surface. It can improve the adhesion of making shells. Immerse the module in cleaning fluid and reciprocate three times, about 4s in total. After taking it out, blow-dry the module with compressed air, and then make a shell by sizing.
Shell Making
After the coating wax patterns, put into the shell-making shop to dry. The surface layer was dried naturally. But the transition layer and back layer are dried by rotary air drying to speed up the drying. The coating was repeated 5 ~ 7 times (5 ~ 6 layers for small stainless steel castings and 6 ~ 9 layers for large stainless steel castings). Surface layer with fine sand, transition layer sand slightly coarse. After several layers of sand is thicker), until forming a 7 ~ 15mm hard shell. The hard shell has enough strength.
Dewaxing and Wax Treatment
The shell backward into the steam dewaxing ax, melt wax patterns, and outflow from the bottom of the shell. By the water separator separation, the liquid wax can be recyclable. 12 hours later, wax liquid through a filter will be included in the static barrels for 6 ~ 8 hours. Finally, wax liquid into the insulation heat preservation box for second use.
Shell Roasting, Pouring & Clearing
Before pouring, the shell after wax removal should be roasted. The shell should be roasted for 50 minutes in an oil furnace or electric furnace at &#;. The main purpose is to remove the residual wax liquid after wax removal. And to improve the strength and permeability of the shell. To prevent deformation or rupture of the shell during pouring. Another extremely important factor is to reduce the temperature difference between the castable liquid stainless steel and the shell to reduce the shrinkage of the workpiece. When the heat preservation of molten steel is stable and can be poured, the shell which reaches the roasting time in the roasting furnace can be poured. After the casting condenses, the shell is destroyed and the pouring system is removed. Finally, the burr is cleaned and shot blasting is carried out to obtain the target cast stainless steel parts. The surface of stainless steel lost wax castings should be treated by pickling and passivation.
Stainless Steel are mainly cast by lost wax casting because it can reach a high accurate surface and dimension.
Investment casting or lost wax casting is a method of precision casting complex near-net-shape details using replication of wax patterns. Investment casting or lost wax is a metal forming process that typically uses a wax pattern surrounded by a ceramic shell to make a ceramic mold. When the shell dries, the wax is melted away, leaving only the mold. Then the casting component is formed by pouring molten metal into the ceramic mold.
The company is the world’s best precision lost wax casting parts supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.
The most widely-used materials of stainless steel mainly include (but not limited to): Stainless Steel: AISI 304, AISI 304L, AISI 316, AISI 316L, 1., 1. and other stainless steel grade.
Stainless steel has a minimum chromium content of 10.5%, making it more resistant to corrosive liquid environments and to oxidation. It is highly corrosion resistant and wear resistant, provides excellent machinability, and is well-known for its aesthetic appearance. Stainless steel investment castings are "corrosion-resistant" when used in liquid environments and vapors below °F (650°C) and "heat-resistant" when used above this temperature.
The base alloy elements of any nickel-base or stainless steel investment casting are chromium, nickel, and molybdenum (or "moly"). These three components will determine the casting's grain structure and mechanical properties and will be instrumental in the casting's ability to combat heat, wear, and corrosion.
Our lost wax casting foundry can manufacture custom stainless steel investment castings that match your exact design specifications. For parts ranging from tens of grams to tens of kilograms or more, we provide tight tolerances and consistent part to part repeatability.
Commonly, the stainless steel should be cast by the investment precision casting process with the silica sol as the bond. The stainless steel silica sol castings have a very high grade of precision surface and performance.
Due to its unique physical properties, stainless steel castings are popular in a wide range of applications, especially those in harsh environments. Common markets for stainless steel investment castings include oil and gas, fluid power, transportation, hydraulic systems, food industry, hardware and locks, agriculture...etc.
The process is suitable for repeatable production of net shape components from a variety of different metals and high performance alloys. Although generally used for small castings, this process has been used to produce complete aircraft door frames, with steel castings of up to 500 kgs and aluminium castings of up to 50 kgs. Compared to other casting processes such as die casting or sand casting, it can be an expensive process. However, the components that can be produced using investment casting can incorporate intricate contours, and in most cases the components are cast near net shape, so require little or no rework once cast.
Silica sol casting process is the main steel investment casting process of RMC investment casting foundry. We have been developing new technology of adhesive material to achieve much more economical and effective adhesive material to build the slurry shell. It is a overwhelming trend that Silica sol casting process replaces the rough inferior water glass process, especially for stainless steel casting and alloy steel casting. Besides the innovated molding material, the silica sol casting process has also being innovated to much steadier and less heat expanding.
&#; Ferrous and Non-ferrous Materials for Investment Casting, Lost Wax Casting Process:
&#; Gray Iron: HT150, HT200, HT250, HT300, HT350; GJL-100, GJL-150, GJL-200, GJL-250, GJL-300, GJL-350; GG10~GG40.
&#; Ductile Iron or Nodular Iron: GGG40, GGG50, GGG60, GGG70, GGG80; GJS-400-18, GJS-40-15, GJS-450-10, GJS-500-7, GJS-600-3, GJS-700-2, GJS-800-2; QT400-18, QT450-10, QT500-7, QT600-3, QT700-2, QT800-2;
&#; Carbon Steel: AISI - AISI , C30, C40, C45.
&#; Steel Alloys: ZG20SiMn, ZG30SiMn, ZG30CrMo, ZG35CrMo, ZG35SiMn, ZG35CrMnSi, ZG40Mn, ZG40Cr, ZG42Cr, ZG42CrMo...etc on request.
&#; Stainless Steel: AISI 304, AISI 304L, AISI 316, AISI 316L, 1., 1., 1., 1., 1., 1. and other stainless steel grade.
&#; Brass, Red Copper, Bronze or other Copper-based alloy metals: ZCuZn39Pb3, ZCuZn39Pb2, ZCuZn38Mn2Pb2, ZCuZn40Pb2, ZCuZn16Si4
&#; Other Materials as per your unique requirements or according to ASTM, SAE, AISI, ACI, DIN, EN, ISO, and GB standards
&#; Capabilities of Investment Casting Foundry
&#; Max Size: 1,000 mm × 800 mm × 500 mm
&#; Weight Range: 0.5 kg - 100 kg
&#; Annual Capacity: 2,000 tons
&#; Bond Materials for Shell Building: Silica Sol, Water Glass and their mixtures.
&#; Tolerances: On Request.
&#; Main Production Procedure
&#; Patterns & Tooling Design &#; Metal Die Making &#; Wax Injection &#; Slurry Assembly &#; Shell Building &#; De-Waxing &#; Chemical Composition Analysis &#; Melting & Pouring &#; Cleaning, Grinding & Shot Blasting &#; Post Processing or Packing for Shipment
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