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We can offer you investment casting parts, railway casting parts, railway parts, excavator machinery 1. Investment casting sand casting/ lost wax casting/precision casting/gravity casting/ Production capacity:
| Carbon steel castings |
ASTM A216-Gr. WCB, Gr. WCA, Gr. WCC; ASTM-415-205, 450-240, 485-275, 80-40; DIN- GS-C25(1.0619), GS-38(1.0416), GS-45(1.0446), GS-52(1.0552), GS-60(1.0558); JIS-SC410, SC450, SC480, SCC5; BS-A1, A2, A5; NF-GE230, GE280, GE320, GE370 |
Soluble glass sand moulding Resin-sand moulding Lost wax casting (Investment casting) Lost foam cast Shell-core cast Electric-furnace smelting |
| Stainless steel castings |
ASTM-CF-8M, CF-8, CA-15, CA-40, 316, 304; DIN-G-X6CrNi18 9(1.4308), G-X7Cr13(1.4001) G-X20Cr14(1.4027), 1.4408; JIS-SCS13, SCS 1, SCS 2, SCS 14A; BS-304C15, 410C21, 420C29, 316, 304; NF-Z6CND18.12M, Z6CN18.10M, Z12C13M, Z20C13M |
Soluble glass sand moulding Resin-sand moulding Lost wax casting (Investment casting) Electric-furnace smelting |
| Alloy steel castings |
DIN-GS-40Mn5(1.1168), GS-20Mn5(1.1120); GS-37MnSi5(1.5122), GS-34CrMo4(1.7220); JIS-SCMn3, SCW480, SCSiMn2, SCCrM3, SCMnCR3; ASTM-LCC UNS-J02505, J13048 NF-G20M6, G35CrMo4 |
Soluble glass sand moulding Resin-sand moulding Lost wax casting (Investment casting) Electric-furnace smelting |
Precision casting, also known as investment casting, is a manufacturing process that produces metal parts with high accuracy and excellent surface finish. In this process, a wax pattern of the part is coated with a ceramic shell. Once the shell hardens, the wax is melted and drained out, leaving a hollow mold that is then filled with molten metal.
The precision casting process involves several key steps:
Pattern creation: A pattern, usually made from wax, is created in the shape of the part to be cast.
Shell building: The wax pattern is coated with a ceramic shell made of silica and other materials. The shell is built up through repeated dipping and hardening.
Wax removal: The mold is heated to remove the wax, leaving a hollow ceramic shell.
Metal pouring: Molten metal is poured into the ceramic shell, filling the cavity where the wax was previously.
Cooling and solidification: The metal cools and solidifies within the mold.
Shell removal: The ceramic shell is broken away, revealing the cast part.
Finishing: The part may undergo additional processes like machining, grinding, or polishing to achieve the final dimensions and surface quality.
Precision casting can be used with a wide range of metals and alloys, including:
Stainless steel
Carbon steel
Alloy steel
Bronze
Aluminum
Copper
Nickel-based alloys
Titanium
The choice of material depends on the specific mechanical properties, corrosion resistance, and thermal properties required for the part.
Precision casting offers several key benefits:
High precision: It can produce parts with tight tolerances (±0.1mm or better) and excellent surface finishes (smooth surface without the need for significant post-processing).
Complex shapes: It is capable of producing parts with complex geometries that would be difficult or impossible to achieve with other methods.
Minimal material waste: The process is highly efficient, with minimal material waste.
Good surface finish: Parts can be cast with a high-quality surface finish that requires little or no additional finishing.
Versatility: It is ideal for producing small to medium-sized parts and is commonly used in industries like aerospace, automotive, and medical devices.
Some limitations of precision casting include:
High cost: The process can be more expensive than other casting methods due to the labor-intensive shell-building and wax removal stages.
Limited part size: It's best suited for small to medium-sized parts, as large parts can be difficult to produce using this method.
Longer lead times: Because the process involves several stages, it can take longer to complete compared to other casting methods like sand casting or die casting.
Not ideal for high-volume production: While suitable for low-to-medium volume production, it may not be cost-effective for very high-volume runs due to the detailed preparation required.
Precision cast parts are highly accurate, often achieving tolerances of ±0.1mm or better. This makes precision casting an ideal choice for parts that require detailed, intricate designs and tight dimensional accuracy, such as parts used in aerospace or medical industries.
Precision casting is widely used in industries that require high-performance, high-precision parts, including:
Aerospace: For turbine blades, engine components, and other critical parts.
Automotive: For engine parts, transmission components, and other intricate automotive components.
Medical devices: For surgical instruments, implants, and other precise medical components.
Defense : For producing complex, durable parts for weapons systems and equipment.
Industrial equipment: For pumps, valves, and machinery components requiring high strength and precision.
Choosing the right material depends on the specific application and requirements of the part:
Stainless steel: Offers good corrosion resistance and is commonly used in medical, aerospace, and food processing industries.
Alloy steels: Used for parts that require high strength and toughness, such as turbine blades or automotive components.
Nickel-based alloys: Ideal for high-temperature and high-stress applications, like aerospace turbine blades.
Aluminum alloys: Lightweight and corrosion-resistant, often used for automotive and aerospace components.
The selection depends on the required mechanical properties, cost considerations, and environmental factors like temperature and corrosion resistance.
Precision casting vs. sand casting: Precision casting offers much higher accuracy and surface finish compared to sand casting, which is better suited for larger, less detailed parts. Precision casting requires more steps and has higher initial costs but produces parts with superior tolerances.
Precision casting vs. die casting: Die casting is faster and more suited to high-volume production of smaller, simpler parts. Precision casting, on the other hand, is better for intricate, highly detailed parts and offers better surface finish and dimensional accuracy.
Precision casting vs. shell molding: Shell molding is similar to precision casting but uses a sand-based mold instead of a ceramic shell. Shell molding is generally used for medium-precision parts and has a lower cost than investment casting.
Common defects in precision casting include:
Porosity: Tiny holes or voids in the casting, often caused by gas trapped during solidification.
Shrinkage: Gaps or voids that form due to the contraction of the metal as it cools.
Inclusions: Contaminants or unwanted materials (like sand or wax residues) embedded in the casting.
Surface cracks: Cracks that form on the surface of the casting due to stress or improper cooling.
Misruns: Occurs when molten metal doesn't completely fill the mold cavity.
To minimize these defects, it's important to control pouring temperatures, mold preparation, and cooling rates.
Yes, precision casting is often used for prototyping because it can produce highly detailed and accurate parts. It is especially useful when testing the form, fit, and function of complex parts before moving to mass production.
The lead time for precision casting depends on the complexity of the part and the production process. On average, the process may take 2-4 weeks for initial prototype casting and 4-8 weeks for small to medium-volume production, including pattern creation, mold building, and finishing. This can vary depending on the specific requirements of the part and production volume.
While precision castings already offer a good surface finish, additional processes may be needed for specific applications:
Machining: For parts requiring exact dimensions and smoother finishes.
Polishing: To achieve an ultra-smooth finish for aesthetic or functional reasons.
Shot blasting: For removing surface imperfections and providing a matte finish.
Coating: To protect the casting and enhance its appearance.
Precision casting can be more expensive than traditional methods like sand casting due to the complex mold-making process, pattern creation, and material costs. However, the costs can be justified for high-precision, complex parts with low-to-medium production volumes. The price will vary depending on factors such as the material used, part complexity, required tolerances, and production volume.
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