Ordering custom tungsten carbide bushings can be challenging, especially when the application involves pumps, compressors, turbines, high pressure, or abrasive fluids.
To get the right part, you must provide clear technical details and understand the key factors that influence design, performance, and cost.
This article guides decision-makers through each step of the ordering process to ensure the custom bushing matches your equipment needs and operating conditions.
Know Your Application Requirements
Before contacting a supplier, you need to define the operating environment. This helps select the correct carbide grade, binder type, dimensions, and finish.
1). Key Factors to Identify
Equipment type (pump, compressor, mixer, turbine, etc.)
Rotational speed
Load and pressure
Fluid type (clean, dirty, corrosive, abrasive)
Operating temperature
Expected service life
These parameters determine how strong, hard, or corrosion-resistant the bushing must be.
2). Example Application Requirements Table
| パラメータ | Typical Range | なぜそれが重要なのか |
|---|---|---|
| Operating speed | 500–10,000 rpm | Affects clearance and carbide grade selection |
| Temperature | 0–350°C | Impacts binder choice and expansion rates |
| Fluid condition | Clean / dirty / corrosive | Determines material hardness and corrosion resistance |
Providing this information early helps avoid delays and incorrect designs.
Define the Exact Dimensions
Accurate dimensions are essential for proper fit and performance.
Even small errors can lead to misalignment, vibration, overheating, or shaft damage.
1). Critical Dimensions to Provide
Inner diameter (ID)
Outer diameter (OD)
長さ
Chamfer angle and size
Tolerance requirements
Concentricity and roundness values
Interference or clearance fit
2). Dimension Tolerance Examples
| 特徴 | Standard Tolerance | High-Precision Tolerance |
|---|---|---|
| Inner diameter | ±0.02 mm | ±0.005 mm |
| Outer diameter | ±0.03 mm | ±0.008 mm |
| Roundness | ≤0.02 mm | ≤0.008 mm |
The more accurate your dimensional data, the smoother your ordering experience will be.
Select the Right Tungsten Carbide Grade
Different grades of tungsten carbide work better for different applications.
1). Factors that Affect Grade Selection
Cobalt (Co) or nickel (Ni) binder content
Speed and temperature
Presence of solids or chemicals
2). Common Grades Used in Bushings
| グレードタイプ | バインダー | 最適な用途 |
|---|---|---|
| Micrograin WC-Co | 6–12% Co | General pumps, high wear resistance |
| Submicron WC-Co | 6–8% Co | High-speed or precision pumps |
| WC-Ni | 8–12% Ni | Corrosive fluids, seawater pumps |
Choosing the correct grade prevents premature wear, corrosion, or cracking.
Choose Surface Finish and Special Treatments
Surface finish strongly affects performance, especially in pump bushings.
1). Common Requirements
Ra ≤ 0.2 µm for sliding surfaces
Ra ≤ 0.05 µm for seal faces
Lapping or super-finishing for low friction
2). Available Special Treatments
防錆コーティング
気孔率 シーリング
研磨
Stress-relief finishing
Edge chamfer optimization
These treatments improve service life and reduce friction and wear.
Decide on Tolerances, Clearance, and Fit
Your supplier must know how the bushing will fit inside the housing and around the shaft.
1). Fit Types
Clearance fit
Interference (press) fit
Transition fit
2). Why Fit Matters
Too tight → cracking, heat, shaft scoring
Too loose → vibration, wobble, noise
3). Clearance Table Example
| 応用 | Recommended Clearance | Reason |
|---|---|---|
| High-speed pump | 0.05–0.12 mm | Prevents heat and friction |
| Vertical turbine pump | 0.15–0.25 mm | Allows for longer shaft lengths |
Clear communication about fit prevents installation failure.
Confirm Quantity, Tolerance Level, and Lead Time
These factors affect production planning and total cost.
1). Things to Clarify
Total quantity
Sample quantity for testing
Allowable tolerance range
Need for inspection certificates
Delivery deadline
Packaging method (foam box, vacuum bag, plastic protector)
2). Why It Matters
Low quantity → higher unit cost
Tight tolerances → lengthy production
Special inspection → longer lead time
Planning ahead ensures stable supply and predictable costs.
Request Testing and Quality Documentation
Quality documents prove that the bushings meet your technical requirements.
Common Documents Provided
Material Test Certificate (MTC)
硬度 report
密度 report
Dimension inspection sheet
Surface roughness report
NDT report (UT or DPI)
These provide transparency and help decision-makers evaluate supplier reliability.
Packaging, Shipping, and Post-Order Support
Carbide bushings are brittle and require careful packaging.
1). Recommended Packaging
Foam-lined boxes
Individual compartments
Plastic caps or end protectors
Moisture barrier packaging (for Ni-binder grades)
2). Post-Order Support to Ask For
Replacement policy
Engineering consultation
After-sales service for installation
Assistance for customizing future batches
Strong after-sales support reduces long-term risk.
結論
Ordering custom tungsten carbide bushings requires accurate data, the right material selection, proper tolerances, and reliable testing.
By following the steps in this guide, decision-makers can ensure better performance, lower failure rates, and smoother cooperation with suppliers.
企業の詳細を知りたい場合は、お気軽にお問い合わせください。 お問い合わせ。
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