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.
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The application of precision casting in the field of medical equipment
Due to the high-precision molding of medical equipment components, complex structures that meet the strict standards of the medical industry, and high requirements for corrosion resistance and surface roughness. Very suitable for precision casting technology.
Our achievements in the field of medical equipment
We have been cooperating with many well-known medical valve companies internationally since 1998 to supply casting blanks. Such as: sanitary diaphragm valve, pressure block, intermediate block, angle valve, five way valve, bracket, etc. We have PED qualification. ERP and MES systems provide comprehensive control over quality and delivery time. A certain amount of safety stock can be prepared for long-term products. Meet customers' strict requirements for quality and delivery time.
Our capabilities in the field of medical equipment
1. High precision and high complexity: It can achieve dimensional accuracy within a tolerance range of ± 0.05mm, meeting the extremely high requirements of medical equipment for part fitting accuracy. Can form complex structures that are difficult to achieve through traditional mechanical processing, such as porous structures and thin-walled structures.
2. Excellent surface quality: The surface roughness of the casting can reach Ra1.6-3.2 μ m, reducing subsequent polishing and other processing steps, especially suitable for parts that come into direct contact with the human body (such as endoscope probe housings).
3. Wide material adaptability: Common materials include stainless steel (316L, 420SS) and cobalt chromium alloy (corrosion-resistant, wear-resistant, used for artificial joints).
4. Compatibility between mass production and customization: It can achieve both large-scale production and small-scale customization through standardized molds.
5. Quality control system, non-destructive testing: X-ray inspection (detecting internal pores and shrinkage), fluorescent penetrant testing (surface cracks), CT scanning (three-dimensional defect analysis) and other methods are used. Mechanical performance testing: tensile strength, fatigue strength. Salt spray test for corrosion resistance performance.
Parameter
| Category |
Parameters |
| Casting Materials |
Common materials: Carbon steel, stainless steel, alloy |
|
Material weight range: 0.003 kg - 110 kg |
|
| Casting Dimensions |
Maximum casting size: Ø600mmX800mm |
|
Minimum casting size: 5 mm x 5 mm x 5 mm |
|
|
Casting wall thickness: 1 mm - 20 mm |
|
| Casting Precision |
Dimensional tolerance: ±0.05 mm - ±0.2 mm (depending on casting size) |
|
Surface roughness: Ra 3.2 µm -6.3 µm |
|
| Production Capacity |
Annual output: 600 tons |
|
Maximum single piece weight: 110 kg |
|
|
Minimum single piece weight: 3 grams |
|
|
Mold materials: Wax molds, ceramic molds |
|
| Casting Process |
Mold types: Precision wax mold casting |
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Pouring methods: Gravity casting, vacuum casting |
|
| Heat Treatment Capability |
Heat treatment processes: Normalizing, annealing, quenching, tempering |
|
Treatment furnace temperature range: 600℃ - 1100℃ |
|
| Post-Processing |
Surface treatment: Polishing, sandblasting, machining, painting, hot-dip galvanizing, powder coating |
Instant inquiry
Products in the pump and valve field are mostly shaped parts, and have high sealing and pressure resistance requirements, so they are more suitable for stainless steel precision casting technology.
Technological 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.
Some of our product catalogs
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:
Product brochure download
Diaphragm valve
Precision casting of medical equipment
Precision casting of medical equipment
Precision casting of medical equipment
Precision casting of medical equipment
Diaphragm valve
Precision casting of medical equipment
Precision casting of medical equipment
Precision casting of medical equipment
Precision casting of medical equipment
Precision casting of medical equipment
Precision casting of medical equipment
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Dazhuge Industrial Park Licha Town Jiaozhou Qingdao CHINA
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