VDV maintains high standards for strict quality control and promises to strictly observe the delivery schedule.
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There are two major categories of lost wax casting: solid mold and ceramic shell mold. The ceramic shell mold is a modified method from solid mold.
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VDV provides rough stainless steel precision castings for numerous well-known global companies and has been recognized as an outstanding supplier multiple times.
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Investment casting can apply any material and more flexible of production capacity.
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All our endeavors are geared towards becoming your premier provider of precision castings!
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Argon shielding (purity ≥99.999%), ER316L filler wire, post-weld grinding to Ra ≤6.3 μm.
MORE +Technological Process
What is the Investment Casting Process?
Investment casting is a manufacturing process in which a liquid material is poured into a ceramic mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. The solidified part is the casting, which is broken away from the ceramic mold to complete the process. The steps within the investment casting process are as follows:
01
Wax Injection
Injection of medium-temperature wax (60-65°C) into metal molds under 0.5-0.7 MPa pressure, with a dwell time of 20-30 seconds.
02
Wax Pattern Trimming
Removal of flash from wax pattern parting lines with precision ±0.1 mm, using hot knives (70-90°C)
03
Cluster Assembly
Welding wax patterns to a central sprue, with cluster weight ≤15 kg, pattern spacing ≥8 mm, and pouring angle of 25-30°.
04
Primary Coating
Silica sol (SiO₂ 20%) + zircon flour (ZrO₂ 80%), 320-mesh，viscosity 42-45 seconds (#4 Zahn cup), coating thickness 0.3-0.5 mm.
05
Backup
Quartz sand, 80~120-mesh 、30~60-mesh 、16~30-mesh chamotte sand stuccoing, total shell thickness 6-8 mm, green strength ≥4 MPa.
06
Dewaxing
High-pressure steam dewaxing (0.6-0.8 MPa, 150-170°C), residual wax ≤0.3%, shell breakage rate <0.5%.
07
Pouring
Gravity casting with preheated molds (1000-1200°C), pouring rate 0.8-1.2 kg/s, solidification cooling rate 50-100°C/min.
08
Shot Blasting & Clear
Shell removal using Φ0.5 mm cast steel shot at 0.4-0.6 MPa,It only takes 20 minutes to remove the casting shell
09
Cutting
Grinding wheel gate removal with ≤1.5 mm allowance, cutting temperature <200°C (to prevent microstructural degradation).
10
Gate Grinding
Resin-bonded grinding wheel (120 grit) for gate finishing, residual gate height ≤0.3 mm, transition radius R≥0.5 mm.
11
TIG Welding & Finishing
Argon shielding (purity ≥99.999%), ER316L filler wire, post-weld grinding to Ra ≤6.3 μm.
12
Final Inspection
PT (penetrant testing), RT (X-ray), full dimensional inspection (CT6-CT8 per ISO 8062), compliant with AMS 2175/ISO 4990.
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Dazhuge Industrial Park Licha Town Jiaozhou Qingdao CHINA
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