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Stainless Steel Lost Wax Casting

• Posted by jiachuan casting May 31, 2022 Filed in Business #Stainless Steel Lost Wax Casting  15 views
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  jiachuancasting is one of the largest stainless steel foundries in China, producing stainless steel castings using the lost wax method. Using this method, stainless steel investment castings with high dimensional accuracy and complex shapes can be produced. In addition to this, it offers engineers a great deal of freedom in product design and material selection. Your specific wishes and requirements can be incorporated into castings. As a custom stainless steel casting supplier and exporter, CFS aims to provide our customers with quality products. Our company is the most reliable manufacturer of stainless steel lost wax casting!

  Stainless Steel Lost Wax Casting Process
  Step 1: Mold Making

  The molds used for stainless steel lost wax casting are mainly used for injection wax molds, which are the same size as the final stainless steel casting. In order to ensure the quality of the wax mold, the mold must have high dimensional accuracy and small surface roughness value. Typically, stainless steel casting companies choose aluminum alloys as the mold material. Compared to other suppliers, jiachuancasting foundries choose aerospace aluminum as the mold material, while other stainless foundries simply use regular aluminum to save costs.

  Step 2: Wax Mold Injection

  Press the processed wax paste into the mold cavity, the ice water machine will condense the ice water and take it out, put it in the pool for a period of time, and get a single wax mold after trimming and checking. Wax models can be understood as die castings.

  Step 3: Wax-Up Restoration

  The quality of the wax pattern will directly determine the quality of the final stainless steel casting. Therefore, the wax mold workshop needs constant temperature control to minimize the deformation of the wax mold. At the same time, check the surface quality of each wax model, and repair the wax model with burrs, flashes and parting lines.

  Step 4: Tree Assembly

  After the wax model is repaired, in order to improve the production efficiency of the qualified wax model, a single wax model is fused and welded on the prefabricated casting system to form a wax model component. Generally, one wax model can weld 2~80 wax models. The tree-forming plan determines the output of the product and the utilization rate of the stainless steel liquid. The treeing scheme should be carefully considered in the design, and whether the treeing scheme will facilitate the recovery and reuse of wax should also be considered.

  Step 5: Wax-Up Removal

  After standing for more than 45 minutes, the wax mold behind the group tree can be cleaned. Before shell making and hanging pulp, the wax mold after the group number must be cleaned to remove the wax and grease on the surface and improve the adhesion of shell making. Immerse the module in the cleaning solution and reciprocate 3 times for a total of about 4s. After taking it out, blow dry the module with compressed air and glue it to make the case.

  Step 6: Shell Making

  After the wax mold is applied, it is placed in the shell workshop to dry. The surface layer is naturally dried, and the transition layer and back layer are dried by rotary air drying to speed up the drying speed. The coating is repeated 5 to 7 times (5 to 6 layers for small stainless steel castings and 6 to 9 layers for large stainless steel castings). Fine sand is used for the surface layer, the transition layer is slightly thicker, and thicker after several layers of sand) until a hard shell of 7-15mm is formed, which has sufficient strength.

  Step 7: Dewaxing and Waxing

  Pour the shell into the steam dewaxing axe to melt the wax pattern and flow from the bottom of the shell. Separated by a water separator, the liquid wax can be recycled. After 12 hours, the wax liquid enters the static bucket through the filter for 6-8 hours, and finally the wax liquid enters the thermal insulation box for secondary use​​​.

  Step 8: Shell Bake, Pouring and Cleanup

  The dewaxed crust should be roasted before pouring. The shells are baked in an oil or electric oven at 1100°C for 50 minutes. The main purpose is to remove the residual wax liquid after dewaxing, improve the strength and air permeability of the shell, and prevent the shell from deforming or breaking during the casting process. Another extremely important factor is to reduce the temperature difference between the pourable liquid stainless steel and the casing to reduce the shrinkage of the workpiece. When the molten steel insulation is stable and pourable, the shell that reaches the roasting time of the roaster can be poured. After the casting has condensed, the casing is destroyed and the gating system is removed. Finally, the burrs are cleaned and shot blasted to obtain the target stainless steel casting. The surface of stainless steel lost wax casting should be pickled and passivated.

  Benefits of Using Stainless Steel Lost Wax Casting
  Intricate Details: Stainless steel lost wax casting allows the production of parts with complex geometries and parts with ornate decorative details.
  Minimal Machining: Stainless steel parts obtained by lost wax investment casting generally do not require extensive machining. Precision casting of specific, precise dimensions and the tight tolerances achieved all reduce the need for labor-intensive machine modifications during the finishing process.
  Excellent surface finish: Stainless steel lost wax castings typically show limited metal burrs and other unwanted metal protrusions along flash and parting lines. They also have an excellent exterior quality when finished.
  High Strength: This production method allows for the manufacture of high strength components, which is especially useful when making certain machine parts.
  Versatility: Lost wax casting can be used to produce virtually any grade of stainless steel, including duplex stainless steels. It can produce multiple detailed parts for high volume manufacturing, while allowing the flexibility of producing one part at a time using the "One Mode Create One Part" system. However, stainless steel lost wax casting is often used for larger production runs due to the relatively high mold costs involved in making the molds.