Stainless Steel Lost Wax Casting Process

Stainless Steel Lost Wax Casting Process

There are During the lost wax casting process, the wax molds are melted away. It creates a wax mirror surface. Lost wax casting allows for the creation of complex precision parts. Because the wax model that gives shape to the mold is the exact size and shape as the part. It provides a highly accurate part. That does not need for secondary operations. So it saves highly cost-effective in many applications. We offer Stainless Steel Lost Wax Casting or Stainless Steel investment casting.

Our main stainless steel casting materials: Stainless Steel SS 304 316 316L 202 Alloys. And we can produce any special Stainless steel Casting Material Composition as per customers’ requirements. The Finish And Coating are Natural, Nickel Plated, Electronic Polished Plated, or any coating as per customer specification.

Next, we will introduce our Stainless Steel Lost Wax Casting Process.

Step 1: Mold Making

After the stainless steel casting design was confirmed, we will start to prepare the stainless steel casting molds. 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.

Step 2: 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.

Step 3: 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.

Step 4: 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.

Step 5: 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.

Step 6: 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.

Step 7: 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.

Step 8: 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 1100℃. 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.

Why choose Stainless Steel Lost Wax Casting?

Choose Stainless Steel Lost Wax Casting, we can get many benefits as a blow.

• 1-Intricate detail: Stainless steel lost wax casting allows the production of parts with complex geometric shapes and parts bearing ornate decorative details.
• 2-Minimal machining: Stainless steel components obtained through lost wax investment casting typically don’t require extensive machining. Both the precision casting in specific, accurate dimensions and the close tolerances achieved reduce the need for labor-intensive machine modifications during finishing.
• 3-Excellent surface finishing: Stainless steel lost wax casting typically displays limited metal burrs and other unwanted excess metal protrusions along flash and parting lines. They also boast an excellent exterior quality following finishing.
• 4-High strength: This method of production permits the creation of high-strength component parts, which proves especially useful in the creation of some machine components.
• 5-Versatility: Lost wax casting can be used to produce almost any grade of stainless steels, including duplex stainless steel. It can produce multiple detailed parts for high volume manufacturing and at the same time permits the flexibility of producing one part at a time using “one pattern creates one part” system. However, because of the relatively high tooling costs involved in creating the molds, stainless steel lost wax casting is usually employed in comparatively large production runs.

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