Precision Bronze Parts Manufacturer. Shaping the Future.

01.

Custom plain bearings

The demand for custom non-standard plain bearings is increasing. We can manufacture copper alloy materials to meet China’s national standards as well as the ASTM (UNS, SAE), EU, and JIS standards.

02.

Bespoke plain bearings

viiplus collaborates with customers to find tailored solutions, offering plain bearings in various materials, sizes, tolerances, and designs.

03.

Timely Delivery

Committed to meeting tight deadlines without compromising on quality, we ensure reliable and efficient production timelines.

04.

Versatility

Capable of handling both small-scale and high-volume orders, we provide seamless support for projects of any size. Additionally, we can develop custom copper alloy materials based on specific customer requirements and drawings.

Specialized manufacturing and machining of bronze components and finished parts.

We specialize in high-precision machined and finished bronze parts tailored to our clients’ unique specifications. Our capabilities include producing both single-piece prototypes and larger batches, ensuring flexibility and scalability for various project demands. We manufacture bronze and self-lubricating bronze according to client specifications and operate a continuous and centrifugal cast bronze foundry, offering machined products in bronze, aluminum bronze, and high-tensile brass. We focus on American standard alloys such as C61900, C86300, C83600, C93700, C90700, C95810, and C95200, with customization to meet national standards for various alloys, including tin bronze, aluminum bronze, aluminum nickel bronze, and lead bronze.

Machining Finished Parts, Machining Parts C61900，C86300，C83600，C93700，C90700,C95810，C95200

Custom Machined Bronze Parts & Bearings

Custom bronze Bearing Parts, Machining Finished Parts

We specialize in the production of custom machined components made from high-quality bronze materials. Our offerings include an extensive variety of bushings and bearings designed to meet diverse industrial requirements and specifications.

We specialize in manufacturing and supplying premium bronze bushings, customized bronze bearing solutions, high-precision machined components, and a wide range of non-ferrous metal alloys—engineered to meet the demands of diverse industries and applications.

Request a Quote today and discover how our expertise can support your performance and reliability needs.

C93200 (SAE660) Bronze Ring Leaded Tin Bronze Leaded Tin Bronze
flange groove bearing C93200 (SAE660) or CuSn7Zn4Pb7-C (CC493K) GC Leaded Tin Bronze
with graphite inserts Material: C86300 Manganese Bronze with Graphite Plugs
with graphite inserts AUTO LUBRIFICANTE
Oil & Gas

Rated Quality Products

hydraulic

Building The Structures

Hoist Equipment

For a greener tomorrow

Marine

Tasks With Intelligence

Custom Cnc Machining Heavy Duty Worm Gear Screw Shaft

Manufacturing and Production, Machining Parts

Customized Bronze and Self-Lubricating Bronze to Client Specifications

We produce custom bronze and self-lubricating parts, such as bushings and plates, manufactured globally to client specifications. Our machining of finished parts adheres to China’s national standards for copper alloy materials and can also comply with ASTM (UNS, SAE), EU, and JIS standards. Additionally, we can develop copper alloy materials based on specific customer requirements and designs.

Whether you need components for industrial machinery, marine applications, or specialized equipment, we leverage our knowledge of bronze alloys and advanced machining capabilities to deliver solutions that excel in performance and reliability.

Expertise in Machining Bronze Alloys and Maintenance-Free Solid Bushings, Machining Parts

Whether you need a single custom part or a full production series, we are dedicated to delivering high-quality bronze components that meet the highest standards of precision and performance.
Our extensive experience in machining a wide range of bronze alloys allows us to tailor our processes to the specific characteristics of each material. By understanding the unique properties of different alloys—such as leaded bronze, phosphor bronze, and aluminum bronze—we optimize machining techniques to achieve precise, high-quality results. This expertise ensures that every component meets the exacting standards required for its intended application.

Application Types: Architectural, Hydro Power & Water Control, Industrial, Infrastructure, Machinery & Heavy Equipment, Power Generation

Solid bronze bearings. LubricationLubrication groove selectionsLooking for technical advice?

Copper Alloy with Graphite Embedded Slide Bearing Bushings manufacturing combine harvester spare parts solid bushing, bronze with lubricant plugs embedded Cast Bronze Bushings with Solid Lubricant Inserts

Download plain bearing brochure

Download our brochure for detailed information on our plain bearings, including an overview, specifications, materials, lubrication, and size lists. Bushings, thrust washers, wear plates, and spherical bearings for high-performance applications.

Discover more bronze bearings

    TYPES OF BRONZE BEARINGS

    C51000 Phosphor Bronze

    Custom Machined Phosphor Bronze Bushing.
    Select options

    C54400 Phosphor Bronze

    VIIPLUS Specialized in Bronze Sleeve and Flange Bearings.
    Select options

    C63000 Nickel Aluminum

    viiplus provide bronze sleeve bearings customized to meet the specific demands of our customers’ applications.
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    C86300 (SAE 430B) Manganese Bronze

    Your go-to resource for online bronze bearings and slide bearing.
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    C93200 (SAE 660) High Lead Tin Bearing Bronze

    Metals: Shop Alloy Thrust Bearing.
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    C95400 Aluminum Bronze Bearing

    Aluminum Bronze Bearing Material Specifications.
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    C95500 Nickel Aluminum Bronze Bearing

    Precision Machining Aluminum Bronze Groove Bushing
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    C95510 Nickel Aluminum Bronze Bearing

    In-house, advanced manufacturing processes such as CNC turning, CNC milling, grinding, lapping, and EDM.
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    Custom Bronze Bearing

    Our skilled engineers are available to expertly guide our manufacturing processes.
    Select options
    Integrated Production for Bronze Bearings, ronze: The Ideal Material for Friction Bearings

    VIIPLUS: Precision Bronze & Alloy Bearings VIIPLUS produces bushings, flange bearings, rings, and slide plates using advanced centrifugal casting, made from bronze and special alloys to meet EN 1982 and ASTM B271 standards. We specialize in large bushes, rings, and sleeves, combining premium materials with modern machining for high-quality, durable, and traceable bearings. Ideal for industrial and structural applications, our bearings handle a wide range of loads and temperatures, from cryogenic to high-heat environments. Products Include: Sleeve, Flange, Thrust, Spherical Plain Bearings, Expansion, Radial & Spherical Plates, plus custom options with grooves or non-standard tolerances. Need technical guidance or a custom solution? Contact our experts today!

    Copper Bushings & Sleeves for Machinery: Durable, Self-Lubricating Bearings

    Copper bushings, also called copper sleeves, are essential components in light, medium, and heavy machinery. They include various types such as copper rollers and bearings, providing reliable performance in mechanical systems across industries.

    Manufactured from high-quality electrolytic copper combined with trace metal elements, these bushings are produced through high-temperature sintering and centrifugal casting under gas pressure. The result is a durable bearing with high hardness, excellent wear resistance, and minimal risk of seizure.

    Key Features:

    • Self-Lubricating & Smooth Sliding: Performs well even under limited lubrication or with water-based lubricants.

    • Corrosion Resistant: Strong resistance to atmospheric and freshwater environments, as well as dilute sulfuric acid.

    • Easy Machining & Versatile Casting: Good machinability for sleeves, bushings, bearings, and sliding blocks, though casting properties are moderate.

    • Durable & Reliable: Ideal for high-wear applications in machinery, ships, instruments, and general structural components.

    Copper bushings are widely used in mechanical systems requiring long-lasting, low-friction components, making them a preferred choice for engineers seeking reliable, self-lubricating solutions.

    VIIPLUS: Expert Bronze & Alloy Bearings for Industrial Excellence

    VIIPLUS manufactures high-performance bushings, flange bearings, rings, and slide plates using advanced centrifugal casting. Our products, made from bronze and specialized alloys, meet EN 1982 and ASTM B271 standards, ensuring reliability and precision.

    Specializing in large bushes, rings, and sleeves, we combine premium raw materials with modern machining—lathes, grinding, and CNC centers—to deliver consistent, high-quality, and fully traceable bearings.

    Our bearings are designed for all industrial applications, capable of handling diverse loads and temperatures, from cryogenic to high-heat environments. VIIPLUS also provides custom plain bearings with specialized grooves or non-standard tolerances.

    Our Product Range Includes:

    • Sleeve Bearings

    • Flange Bearings

    • Thrust Bearings

    • Spherical Plain Bearings

    • Expansion, Radial, and Spherical Plates

    Need technical advice or a custom solution? Connect with our experts today.

     
     
     
     
     

    Premium Bronze Bearing Materials for Industrial Applications

    We specialize in high-performance bronzes ideal for demanding industrial and plastic processing applications. Our range includes:

    1. Aluminum Bronze (BA1032)

    • Combines aluminum with copper for superior corrosion resistance and durability.
    • Applications: Heavy machinery, marine engineering (screws, shafts, bearings), and chemical industry components. Resists saltwater degradation, making it ideal for subsea parts in shipbuilding and offshore installations.

    2. Tin Bronze

    • Standard Variants:
      • Lead-Tin Bronze (RG7): High lead content ensures excellent wear resistance and reduced friction, ideal for high-stress bearings and bushings.
      • Phosphor Bronze (B101): Tin-phosphorus alloy offering enhanced hardness and fatigue resistance for gears, valves, and electrical contacts.
      • CuSn 12: 12% tin bronze optimized for components requiring extreme abrasion resistance, such as heavy-duty bearings and hydraulic systems.

    Key Advantages Across All Bronzes:

    • Durability: Withstand heavy loads, friction, and harsh environments.
    • Corrosion Resistance: Ideal for marine, chemical, and industrial settings.
    • Versatility: Available in bars, rods, and custom-machined parts.

    Whether for marine propulsion systems, construction machinery, or precision instruments, our bronzes deliver reliability and longevity. Contact us to select the optimal alloy for your bearing and component needs.

    Alloy No. Generic Description ASTM Specification Maximum Recommended Bearing Load Maximum Recommended PV
    614 Aluminum Bronze B169-C61400 5000 psi (35 N/mm²) 60,000 psi-ft/min (130 N/mm²-m/min)
    862 Manganese Bronze B584-C86200 6000 psi (41 N/mm²) 72,000 psi-ft/min (150 N/mm²-m/min)
    863 Manganese Bronze B22-C86300 8000 psi (55 N/mm²) 80,000 psi-ft/min (170 N/mm²-m/min)
    865 Manganese Bronze B584-C86500 4000 psi (27.5 N/mm²) 48,000 psi-ft/min (100 N/mm²-m/min)
    905 Tin Bronze B22-C90500 2000 psi (14 N/mm²) 30,000 psi-ft/min (65 N/mm²-m/min)
    911 Tin Bronze B22-C91100 2500 psi (17.5 N/mm²) 36,000 psi-ft/min (75 N/mm²-m/min)
    924 Leaded Tin Bronze B22-C90500M 2000 psi (14 N/mm²) 30,000 psi-ft/min (65 N/mm²-m/min)
    932 High Leaded Tin Bronze B584-C93200 1500 psi (10 N/mm²) 24,000 psi-ft/min (50 N/mm²-m/min)
    937 High Leaded Tin Bronze B22-C93700 1000 psi (7 N/mm²) 20,000 psi-ft/min (45 N/mm²-m/min)
    954 Aluminum Bronze B148-C95400 4000 psi (27.5 N/mm²) 48,000 psi-ft/min (100 N/mm²-m/min)
    955 Nickel Aluminum Bronze B148-C95500 6000 psi (41 N/mm²) 72,000 psi-ft/min (150 N/mm²-m/min)

    When selecting an appropriate alloy for your application, it’s critical to balance the different properties needed to achieve a durable, low-maintenance solution. Some of the most common factors influencing alloy choice include:

    • Bearing Load and Velocity: Higher loads and speeds often require alloys with greater strength and fatigue resistance.
    • Type of Movement: Oscillating or intermittent motion might benefit from alloys that can handle variable forces and resist galling.
    • Temperature and Environment: Extreme temperatures or corrosive environments call for materials with strong thermal stability and excellent corrosion resistance.
    • Mechanical Properties: Shear strength, fatigue strength, and deformability dictate how well the alloy will withstand continuous use.
    • Compatibility and Hardness Differential: Ensuring that the bearing material is compatible with the shaft material can prevent excessive wear. A proper hardness differential minimizes galling and extends the lifespan of the components.
    • Wear Resistance and corrosion resistance: Selecting an alloy that provides a good balance of wear and corrosion resistance is often key to achieving maintenance-free operation.
    • Cost: While higher-performance alloys may provide longer service life and reduced maintenance, cost considerations must also be factored in to determine the overall value.

    In many industrial and structural applications, high-strength bronze alloys are commonly chosen due to their reliable performance. This Table  (as referenced) provides an overview of commonly used high-strength bronzes, while specialty alloys can be selected for unique or demanding conditions. The correct choice ultimately depends on a thorough analysis of the operating environment and the specific requirements of all bearing system components.

    Cast Bronze Alloys in Bearing Applications: A Structured Overview

    1. Introduction to Cast Bronze Alloys
      Cast bronze alloys have been a cornerstone in bearing applications for centuries due to their unmatched versatility. By alloying copper with elements like tin, aluminum, or manganese, properties such as strength, wear resistance, and corrosion tolerance can be tailored to meet diverse industrial needs. Their adaptability makes them superior to many alternative materials in balancing performance requirements.
    2. Key Properties and Alloying Elements
      • Copper Base: Provides inherent corrosion resistance and thermal conductivity.
      • Alloying Elements: Tin (enhances hardness), aluminum (improves strength and oxidation resistance), manganese (adds toughness), and lead or graphite (for self-lubrication).
      • Customizable Traits: Mechanical strength, shock resistance, lubrication efficiency, and fatigue resistance are adjusted based on application demands.
    3. Common Bronze Alloys for Bearings
      • Aluminum Bronze:
        • Composition: Copper + aluminum (up to 14%), iron, nickel.
        • Properties: Exceptional high-load capacity, wear resistance, and corrosion tolerance. Ideal for marine and heavy machinery bearings.
      • Manganese Bronze:
        • Composition: Copper + zinc, manganese, and small amounts of aluminum or iron.
        • Properties: High tensile strength and shock absorption. Used in gears, bushings, and applications with dynamic stresses (e.g., automotive suspensions).
    4. Self-Lubricating Bronze Bearings
      • Design: Incorporate lubricating agents (e.g., graphite plugs, oil-impregnated pores) to reduce friction without external grease.
      • Applications: Suitable for maintenance-free or hard-to-access environments, such as conveyor systems or agricultural equipment.
    5. Manufacturing Processes
      • Casting Methods:
        • Centrifugal Casting: Produces dense, uniform structures for cylindrical parts (e.g., bushings).
        • Sand Casting: Allows complex shapes and large components.
        • Continuous Casting: Efficient for standardized profiles like rods or tubes.
        • Forged Castings: Likely refers to forged bronze components for enhanced grain structure and strength in high-stress applications.
    6. Compliance and Quality Assurance
      • Standards: Manufactured to ASTM (e.g., B22, B271) and ISO specifications, ensuring material consistency and performance.
      • Testing: Physical (hardness, tensile strength) and chemical analyses are available to verify compliance, critical for aerospace, energy, or safety-critical industries.

    Why Bronze?
    Bronze alloys excel in environments requiring a balance of durability, thermal management, and corrosion resistance. While alternatives like polymers or composites may offer lightweight benefits, bronze remains irreplaceable in high-load, high-temperature, or corrosive settings. Limitations (e.g., weight, cost) are offset by longevity and reliability in demanding applications.

    This structured approach highlights the adaptability and enduring relevance of cast bronze alloys in meeting modern engineering challenges.

    SHAPES
    Self-lubricating bearings are available in a variety of shapes tailored to specific applications, load directions, and movement types. Below are the most commonly used shapes:

    Bushings
    One-piece sleeve bushings are widely used for both rotary and linear motion applications. These bushings are ideal for situations where the shaft load is primarily radial (perpendicular to the shaft axis). Depending on the size of the bearing, lubricating recesses may either pass all the way through the bearing wall or be partial for larger bushings. For easy disassembly and reassembly, split bushings are offered, either matched (split before final machining to ensure precise 180° halves) or unmatched (split after machining, leading to slight variations from perfect halves). Matched halves are marked to ensure proper assembly, maintaining concentricity.

    Washers
    Washers are used to manage end thrust when the shaft load is aligned with the shaft axis. They can be used on their own or in conjunction with sleeve bushings, and are designed to be lubricated on one or both sides depending on the application.

    Flange Bushings
    Flange bushings combine the features of sleeve bushings and washers in a single unit. These bushings are ideal for applications where the shaft load has both axial and radial components. The flanges can be lubricated for thrust load applications or left without lubrication when the bushing serves merely as a spacer.

    Spherical Bearings
    Self-aligning spherical bearings are designed to accommodate radial loads and some degree of misalignment, which may occur due to structural or shaft deflections under load. These bearings consist of an inner component (gimbal) with a cylindrical inside diameter for shaft rotation and a spherical convex outside diameter, paired with an outer component (race) with a matching concave inside diameter. Either of the two components can be lubricated.

    Plates
    Bearing plates are used to support both longitudinal and transverse movement under vertical and horizontal loads. They are available in single-piece constructions, up to 144″ in length for most bearing alloys. Typically, bearing plates are fastened using machine screws or secured with welded bars.

    Radial bearing plates feature both a curved radial surface and a flat surface, with lubrication available on either or both sides. The radial surface, installed with a corresponding curved mating plate, allows for deflection and rotation. The flat surface accommodates linear expansion and contraction. Spherical bearing plates have lubricated concave or convex spherical surfaces to allow rotation in any direction. These plates are available to accommodate sliding, rotation, and angular misalignment, and can be paired with spherical components, sole plates, base plates, and anchorage for additional support.

    SIZING
    Several factors influence bearing design, but the following guidelines are typically applicable for most self-lubricating bearings. Available in both inch and metric sizes, these bearings are generally supplied finished to meet the precise specifications of each application.

    Inside Diameter
    The nominal inside diameter of a bushing is determined by the shaft diameter. For optimal performance, the shaft should be as strong and rigid as possible to minimize frictional resistance and power loss, enabling the use of the smallest practical shaft diameter.

    Outside Diameter
    The outside diameter of a bushing is based on the required wall thickness and housing bore size. To calculate the outside diameter, add twice the recommended wall thickness to the inside diameter of the bushing. Refer to Tables 2 and 3 for recommended wall thicknesses for self-lubricating bushings. The values provided are suitable for most applications, depending on the shaft load, bushing diameter, and the yield strength of the bearing material. Generally, lower-strength alloys require the maximum wall thickness, while higher-strength alloys can utilize the minimum thickness.

    Length
    The bearing length is determined by the projected area needed to handle the radial load. It can be calculated by dividing the shaft load by the desired bearing pressure multiplied by the inside diameter. Typically, the length-to-diameter (L/D) ratio of a bushing should be between 1.0 and 2.0 for optimal performance. Shorter lengths can result in over-stressing the bearing, while longer lengths may cause edge loading. Bearings designed within the recommended L/D ratio usually tolerate shaft misalignment and shock loads without excessive wear.

    Flange and Washer Thickness
    The thickness of a bushing flange or thrust washer generally matches the wall thickness of the corresponding bushing, as shown in Tables 2 and 3.

    Plate Thickness
    The thickness of bearing plates should be proportional to the overall size of the plate, with a minimum thickness of one-half inch (12.7 mm) recommended for most flat plates.

    SIZING
    Several factors influence bearing design, but the following guidelines are typically applicable for most self-lubricating bearings. Available in both inch and metric sizes, these bearings are generally supplied finished to meet the precise specifications of each application.

    Inside Diameter
    The nominal inside diameter of a bushing is determined by the shaft diameter. For optimal performance, the shaft should be as strong and rigid as possible to minimize frictional resistance and power loss, enabling the use of the smallest practical shaft diameter.

    Outside Diameter
    The outside diameter of a bushing is based on the required wall thickness and housing bore size. To calculate the outside diameter, add twice the recommended wall thickness to the inside diameter of the bushing. Refer to Tables 2 and 3 for recommended wall thicknesses for self-lubricating bushings. The values provided are suitable for most applications, depending on the shaft load, bushing diameter, and the yield strength of the bearing material. Generally, lower-strength alloys require the maximum wall thickness, while higher-strength alloys can utilize the minimum thickness.

    Length
    The bearing length is determined by the projected area needed to handle the radial load. It can be calculated by dividing the shaft load by the desired bearing pressure multiplied by the inside diameter. Typically, the length-to-diameter (L/D) ratio of a bushing should be between 1.0 and 2.0 for optimal performance. Shorter lengths can result in over-stressing the bearing, while longer lengths may cause edge loading. Bearings designed within the recommended L/D ratio usually tolerate shaft misalignment and shock loads without excessive wear.

    Flange and Washer Thickness
    The thickness of a bushing flange or thrust washer generally matches the wall thickness of the corresponding bushing, as shown in Tables 2 and 3.

    Plate Thickness
    The thickness of bearing plates should be proportional to the overall size of the plate, with a minimum thickness of one-half inch (12.7 mm) recommended for most flat plates.

    • Low Friction Coefficient: Ensures smooth operation and reduced wear, extending the lifespan of components.
    • High Thermal Conductivity: Efficiently dissipates heat, preventing overheating and maintaining performance under demanding conditions.
    • Superior Strength and Toughness: Withstands heavy loads and mechanical stress, ensuring durability and reliability.
    • Excellent Corrosion Resistance: Performs reliably in harsh environments, reducing maintenance and downtime.

    | ASTM B505  | Closest Alloys                     | Type of Alloy        | Material Composition          |
|------------|------------------------------------|----------------------|-------------------------------|
| C83600     | C83600 / C836 / CDA836 / CC491K    | Tin bronzes          | CuSn5ZnPb5-C                  |
| C84400     | C84400 / C844 / CDA844 / CC490K    | Tin bronzes          | CuSn3Zn8Pb5-C                 |
| C86200     | C86200 / C862 / CDA862 / CC764S    | High tensile brasses | CuZn34Mn3Al2Fe1-C             |
| C86300     | C86300 / C863 / CDA863 / CC762S    | High tensile brasses | CuZn25Al5Mn4Fe3-C             |
| C90300     | C90300 / C903 / CDA903             | Tin bronzes          | -                             |
| C90500     | C90500 / C905 / CDA905             | Tin bronzes          | -                             |
| C90700     | CC483K                             | Tin bronzes          | CuSn12-C                      |
| C92200     | -                                  | Tin bronzes          | -                             |
| C92700     | C92700 / C927 / CDA927 / CC480K    | Tin bronzes          | CuSn10-C                      |
| C93200     | C93200 / C932 / CDA932 / CC493K    | Tin bronzes          | CuSn7Zn4Pb7-C                 |
| C93600     | C93600 / C936 / CDA936             | Lead bronzes         | -                             |
| C93700     | C93700 / C937 / CDA937 / CC495K    | Lead bronzes         | CuSn10Pb10-C                  |
| C93800     | C93800 / C938 / CDA938 / CC496K    | Lead bronzes         | CuSn7Pb15-C                   |
| C93900     | C93900 / C939 / CDA939             | Lead bronzes         | -                             |
| C94100     | C94100 / C941 / CDA941 / CC497K    | Lead bronzes         | CuSn5Pb20-C                   |
| C95200     | C95200 / C952 / CDA952 / CC331G    | Aluminium Bronzes    | CuAl10Fe2-C                   |
| C95400     | C95400 / C954 / CDA954             | Aluminium Bronzes    | -                             |
| C95500     | C95500 / C955 / CDA955 / CC333G    | Aluminium Bronzes    | CuAl10Fe5Ni5-C                |
| C95520     | C95520 / C955 / CDA955             | Aluminium Bronzes    | -                             |
| C95800     | C95800 / C958 / CDA958             | Aluminium Bronzes    | -                             |
| C95900     | C95900 / C959 / CDA959             | Aluminium Bronzes    | -                             |

    Key:

    • ASTM B505: The standard alloy designation.
    • Closest Alloys: Equivalent or closely related alloys.
    • Type of Alloy: Classification of the alloy (e.g., Tin bronzes, Lead bronzes, etc.).

    The production of bronze bearings involves several stages, from raw material selection to the final product. Here’s a step-by-step overview of the process:

    1. Raw Material Selection

    • Bronze Alloy Composition: Bronze bearings are typically made from copper-based alloys, often with tin as the primary alloying element (e.g., C93200 or SAE 660 bronze). Other elements like lead, zinc, or phosphorus may be added to improve machinability, wear resistance, or lubrication properties.
    • Material Quality: High-quality raw materials are essential to ensure the final product meets performance standards.

    2. Melting and Alloying

    • Melting: The raw materials are melted in a furnace at temperatures around 1,000–1,200°C (1,832–2,192°F), depending on the alloy composition.
    • Alloying: The desired alloying elements are added to the molten metal to achieve the specific bronze composition required for the bearing.
    • Degassing and Fluxing: Impurities are removed using degassing agents or fluxes to ensure the metal is clean and free from inclusions.

    3. Casting

    • Mold Preparation: Sand casting, centrifugal casting, or continuous casting methods are used to shape the molten bronze into bearing blanks or sleeves.
    • Pouring: The molten bronze is poured into the prepared molds.
    • Cooling: The castings are allowed to cool and solidify in the molds.
    • Removal: Once solidified, the castings are removed from the molds.

    4. Machining

    • Rough Machining: The cast blanks are machined to approximate dimensions using lathes, milling machines, or CNC equipment.
    • Precision Machining: Final dimensions and tolerances are achieved through precision machining processes, such as turning, boring, and grinding.
    • Surface Finishing: The bearing surfaces are finished to the required smoothness and accuracy.

    5. Heat Treatment (if required)

    • Some bronze alloys may undergo heat treatment to improve mechanical properties, such as hardness or wear resistance.

    6. Quality Control

    • Dimensional Inspection: The bearings are checked for dimensional accuracy using precision measuring tools.
    • Material Testing: Tests such as hardness testing, chemical analysis, and microstructure examination ensure the material meets specifications.
    • Surface Inspection: The bearing surfaces are inspected for defects like cracks, porosity, or roughness.

    7. Lubrication (if required)

    • Some bronze bearings are impregnated with lubricants (e.g., oil or graphite) to enhance their self-lubricating properties.

    8. Final Finishing

    • Cleaning: The bearings are cleaned to remove any machining residues or contaminants.
    • Coating (if required): Some bearings may receive coatings (e.g., anti-corrosion coatings) for specific applications.

    9. Packaging and Shipping

    • The finished bronze bearings are packaged to prevent damage during transportation and shipped to customers or distributors.

    Applications of Bronze Bearings

    Bronze bearings are widely used in industries such as automotive, marine, aerospace, and heavy machinery due to their excellent wear resistance, low friction, and ability to operate under high loads and temperatures.

    Let me know if you’d like more details on any specific step!

    Benefits the entire process and ensures compliance with international standards:

    1. Raw Material Control

    • Supplier Selection: By carefully selecting and auditing raw material suppliers, you ensure the highest quality inputs (e.g., copper, tin, lead, etc.).
    • Material Traceability: Each batch of raw materials can be tracked, ensuring full traceability from sourcing to the final product.
    • Chemical Analysis: Incoming materials are analyzed to verify their composition and purity, ensuring they meet specifications.

    2. Alloy Mixing and Melting

    • Precision Mixing: In-house production allows for precise control over the alloy composition, ensuring uniformity across batches.
    • Process Monitoring: The melting and alloying process is closely monitored to maintain consistent temperature, mixing, and degassing.
    • Quality Assurance: Samples are taken during melting to verify the chemical composition and adjust as needed.

    3. Manufacturing Processes

    • Casting Control: In-house casting ensures that parameters like cooling rates, mold quality, and pouring techniques are optimized for consistent results.
    • Machining Precision: Machining processes are tightly controlled to achieve exact dimensions and surface finishes.
    • Process Optimization: Continuous monitoring and feedback allow for process improvements and reduced variability.

    4. Measurements and Analysis

    • Dimensional Inspection: Advanced measuring tools (e.g., CMMs, micrometers, and profilometers) ensure that all parts meet precise tolerances.
    • Material Testing: Mechanical and metallurgical tests (e.g., hardness, tensile strength, microstructure analysis) verify that the material properties meet requirements.
    • Non-Destructive Testing (NDT): Techniques like ultrasonic testing or X-ray inspection detect internal defects without damaging the product.

    5. Compliance with International Standards

    • Certifications: In-house production allows for adherence to international standards (e.g., ISO, ASTM, SAE) and obtaining relevant certifications.
    • Documentation: Detailed records of every stage of production ensure compliance with regulatory and customer requirements.
    • Audits: Regular internal and external audits verify that processes and products meet quality and safety standards.

    6. Traceability

    • Batch Tracking: Each batch of material and finished product is assigned a unique identifier, allowing full traceability.
    • Process Records: Detailed records of every step (e.g., melting, casting, machining) are maintained for accountability and quality assurance.
    • Customer Confidence: Traceability builds trust with customers, as they can be assured of the product’s origin and quality.

    7. Customization and Flexibility

    • Tailored Alloys: In-house production allows for custom alloy formulations to meet specific customer requirements.
    • Rapid Prototyping: Faster turnaround times for prototypes and small batches.
    • Process Adaptability: Ability to quickly adjust processes based on feedback or changing requirements.

    8. Cost and Time Efficiency

    • Reduced Lead Times: In-house production eliminates reliance on external suppliers, reducing lead times.
    • Cost Control: Greater control over raw material usage, waste reduction, and process optimization lowers costs.
    • Continuous Improvement: In-house operations enable ongoing process refinement and innovation.

    9. Customer Service

    • Technical Support: In-house expertise allows for better customer support, including technical advice and problem-solving.
    • Consistent Quality: Customers receive products with consistent quality, reducing the risk of defects or failures.
    • Custom Solutions: Ability to provide tailored solutions based on customer needs.

    10. Sustainability

    • Waste Management: In-house production allows for better control over waste and recycling of materials.
    • Energy Efficiency: Optimized processes reduce energy consumption and environmental impact.
    • Sustainable Sourcing: Ability to source raw materials responsibly and ensure ethical practices.
    bronze bearing cast parts2

    Material Selection

    Bronze Alloy Composition

    Centrifugal Casting1

    Casting

    Centrifugal casting, continuous casting

    Machine tool bearing

    Machining

    Precision Machining

    Vernier caliper measurements on the piston

    Quality Inspection

    Material Testing, Surface Inspection

    Bronze & brass standards

    VIIPLUS employs centrifugal casting to manufacture bushings, rings, slide plates, wear plate, slide blocks, sleeves, and flanged plain bearings using various copper alloys that meet global standards such as EN 1982 and ASTM B271, including special alloys. For example, Tin bronze provide good wear resistance, high load carrying capacity and corrosion resistance. Tin ensures high durability and tensile strength, making it suitable for highly loaded, corrosion-prone machine components and friction parts in machines operating under high pressure and speed.

    CuAl10Fe2
    CuSn11P
    CuSn7Zn4Pb7
    CuZn33Pb
    CuAl10Fe
    CuAl10Ni3Fe2
    CuSn11Pb2
    CuSn10Pb10
    CuAl10Ni
    CuAl10Fe5Ni5
    CuSn12
    CuZn25Al5Mn4Fe3
    CuZn25Al5

    CuAl11Ni

    RG7
    CuAl11Fe6Ni6
    CuSn12Ni2
    CuZn34Mn3Al2Fe1
    CuZn34Al2
    CuSn5ZnPb
    CuSn10

    CuSn5Zn5Pb5

    CuZn32Al2Mn2F31
    CuZn35Al1
    CuAl10NiFe4
    CuSn7ZnPb
    C95800
    C52400
    C91700
    C83600
    C95400*
    C90500
    C86300
    C93200*
    C90500
    C86200

    Machined Bronze Components

    Custom Manufacturing from Client Drawings

    Special Bronze Alloy

    International Service

    Self-Lubricating Functionality

    Custom size Production