Graphite cast bronze bearings are a type of self-lubricating bearing that incorporates solid bronze plates with graphite plugs to achieve the self-lubricating property. Here's how the self-lubrication is realized in these bearings:

Material Composition: The bearing is made from a bronze alloy which is known for its good wear resistance and strength. The bronze is cast with graphite plugs that serve as a source of solid lubrication.

Graphite as a Lubricant: Graphite is a solid lubricant that has a natural ability to reduce friction between sliding surfaces. When the bearing is in motion, the graphite within the bronze matrix transfers to the contact surfaces, creating a thin, low-friction film that helps to reduce wear.

Initial Break-In Period: During the initial operation of the bearing, there is a break-in period where the transfer of material from the bearing to the mating surface occurs. This is a critical step in establishing the self-lubricating film on the contact surfaces.

Ongoing Transfer Process: After the initial break-in, the transfer process continues dynamically throughout the operational life of the bearing. The graphite continues to be transferred to the mating surface, maintaining a lubricating film that reduces friction and wear.

Maintenance-Free Operation: Unlike bearings that require regular application of external lubricants, graphite cast bronze bearings are designed to be maintenance-free. The graphite within the bronze provides a long-lasting source of lubrication, reducing the need for maintenance and extending the service life of the bearing.

Suitability for Various Applications: Due to their self-lubricating nature, graphite cast bronze bearings are suitable for applications where regular maintenance is difficult or where the environment is harsh, such as in high temperatures, contaminated conditions, or where there is a need for a dry-running system.

In summary, the self-lubrication in graphite cast bronze bearings is achieved through the use of graphite as a solid lubricant within the bronze matrix. This combination allows for a continuous transfer of lubricant to the contact surfaces, ensuring reduced friction, wear, and the need for maintenance.

Wear Plates - Metric size wear plates are made to the standard,Thickness Width Length Material CAD Add to Quote

Available in the following configurations:

·Bronze w/Graphite

·Bronze no Graphite

·Bronze w/Grease Grooves

·Steel w/Graphite

Wear Plates Bronze Wear Plates - Metric - Self Lube Mold and Die Products

How Bronze Bearing Graphite Graphite realizing the self-lubrication?

Solid Bronze Metallic Self-lubricating Spacer Plug Graphite Cast Bronze Bearing Solid Bronze Plate C86300 | VSB-50P

FunctionaI in absence of oiI BRONZE GRAPHITE BUSHINGS Straight Bushings the can be used in circumstances where oiling and greasing is difficult or impossible and they perform excellent Iubrication even under low-speed and high Ioad circumstances.

Since the Iinear expansibility of solid Iubricant is greater than metallic matrix's, when the movement of solid lubricant bearings(VIIPLUS SLIDING BEARING BRONZE GRAPHITE BUSHINGS)start, the Iubricant is transferred onto the parts in abrasion thus realizing the self-lubrication.

VSB-50P Sliding PLATE

Copper Cast Bronze Bearings Slide Block Anti Abrasion For Transportation Machines

1. May work without any ol for long period

2. Extremely high load capacity, good anti-wear and lower friction

3. Particularly appropriate for low speed and high load

4. Suitable for reciprocating, oscillation or intermittent motion where oil film is hard to be formed

5. Good chemical resistant and anti-corrosion characteristics

6. Can b€ used in wide range of temperature from -40℃-+300℃

Aluminum-Bronze With Solid Lubricant Casting Bronze Silde Block

Aluminum-Bronze Solid Lubricating Silde Block is backed with Aluminum-Bronze alloy with good capability of mechanics, castings and anti-erosion. The surface of Aluminum-Bronze Solid Lubricating Silde Block is regularly and finely machined with sockets in which particular solid lubricant is filled.

Aluminum-Bronze Solid Lubricating Silde Block is widely used conditions with mediate load but higher temperature and condition with mediate running velocity etc.

The surface of Aluminum-Bronze Solid Lubricating Silde Block is regularly and finely machined with sockets in which particular solid lubricant is filled.

Chemical Compositions

AVAILABILITY

Bearing forms available in standard dimensions

· Cylindrical bushes

· Flanged bushes

· Sliding plates

Bearing forms made to order: standard forms in special dimensions, thrust washers, flanged thrust washers, half-bearings, special shapes obtained by stamping or deep drawing, customized bearing designs

This kind of bearing can be applied under dry, high temperature, high pressure, corrosive, water or other chemical environments when no oil can be introduced. It is widely used in automotive products line, water engineering, dam gate, plastic industries, successive casting machines, steel rollers in metallurgy industry, mineral machines, ships, turbo generators, hydraulic turbines and injection molding machines...

Beyond Grease: A Deep Dive into Oilless Bushings & Why Viiplus Leads the Way

Friction is the enemy of efficiency. In countless machines, from massive industrial equipment to intricate automotive components, the constant battle against wear and tear dictates performance, longevity, and maintenance costs. Traditionally, grease and oil have been the go-to solutions, but they come with their own set of challenges: frequent re-lubrication, potential contamination, environmental concerns, and limitations in extreme conditions.

Enter the world of oilless bushings, also known as self-lubricating bearings or sliding bearings. These innovative components offer a smarter way to manage friction, delivering reliable movement without the need for external lubrication.

At Viiplus (www.viiplus.com), we don't just supply these components; we engineer solutions. Leveraging deep expertise in metallurgy and tribology (the science of friction, wear, and lubrication), we've become a leading name in sliding bearing technology. But what exactly are oilless bushings, and why should they be on your radar? Let's dive deeper.

What Exactly Are Oilless Bushings? The Science of Self-Lubrication

Unlike traditional ball or roller bearings that rely on rolling elements and require constant lubrication films, oilless bushings operate on the principle of sliding motion. Their "magic" lies in their material composition and structure, designed to provide their own lubrication at the bearing surface. This can be achieved through several key technologies:

1. Solid Lubricants Embedded: Materials like graphite, MoS₂, or PTFE are embedded directly into the metallic matrix (often bronze) of the bushing. As the shaft rotates or slides, a minuscule amount of this solid lubricant is transferred to the mating surface, creating a low-friction film.

2. Porous Metal Structures: Sintered bronze or iron materials are created with microscopic pores. These pores are vacuum-impregnated with oil during manufacturing. In operation, slight heating causes the oil to expand and seep onto the bearing surface, providing lubrication. When it cools, the capillary action draws the oil back in, creating a closed-loop system.

3. Layered Composites: These often feature a strong backing (like steel), an intermediate sintered layer (like bronze), and a low-friction overlay (often PTFE-based). The PTFE layer provides the primary sliding surface, offering extremely low friction.

Contrasting Logic: Oilless vs. Traditionally Lubricated Bearings

The Tangible Benefits: Why Make the Switch?

Choosing oilless bushings isn't just about eliminating grease guns. It's about unlocking significant operational advantages:

• Drastically Reduced Maintenance: This is the most obvious benefit. No re-greasing means less labor, less scheduled downtime, and simplified maintenance protocols. Imagine the savings across a factory floor!

• Enhanced Reliability: Lubricant starvation is a major cause of bearing failure. Self-lubricating bearings ensure consistent lubrication, leading to predictable performance and longer service life, especially in hard-to-reach locations.

• Superior Performance in Harsh Conditions: Oilless bushings excel where traditional lubricants fail:

  • High Temperatures: Certain types can operate at temperatures far exceeding the limits of conventional greases.

  • Low Temperatures: No grease means no stiffening or freezing issues.

  • Contaminated Environments: The absence of sticky grease reduces the ingress of dirt, dust, and debris.

  • Vacuum or Underwater: Ideal for applications where liquid lubricants are impractical or impossible.

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• Cost Savings (Total Cost of Ownership): While the initial purchase price might sometimes be higher, the TCO is often significantly lower due to savings on lubricants, labor, downtime, and potential component failure replacement.

• Environmental Friendliness: Eliminating oil and grease leakage prevents contamination of products, machinery, and the environment. Crucial for industries like food processing, pharmaceuticals, and textiles.

• Compact & Simplified Designs: Without the need for lubrication systems (nipples, lines, reservoirs), machine designs can be more compact and streamlined.

Exploring Viiplus's Portfolio: Finding Your Solution

Viiplus offers a comprehensive range of self-lubricating bearings designed to meet diverse application needs. Understanding the different series helps in selection:

• JDB Series (Graphite Plugged Bronze): Excellent for high-load, low-speed applications, intermittent motion, and high temperatures. The graphite plugs provide continuous solid lubrication. Ideal for heavy machinery, molds, and hydraulic components.

• SF Series (PTFE-Based Composite): Typically metal-backed (SF-1: steel, SF-2: steel/bronze) with a PTFE-based lining. Offers very low friction, good wear resistance, and suitability for dry running or marginal lubrication. Common in automotive, office equipment, and hydraulics.

• JF Series (Bimetal Bushings): Combines a steel backing with a sintered bronze or lead-bronze lining. Good load capacity and fatigue strength. Often used with grease or oil but can operate marginally lubricated. Found in engines, chassis parts, and agricultural machinery.

• FB Series (Wrapped Bronze): Often made from bronze strip, sometimes with lubrication pockets or through-holes. A cost-effective solution for medium loads and speeds, typically requiring initial greasing but offering extended re-lubrication intervals.

Quick Comparison Chart (General Guide):

(Note: This is a simplified guide. Always consult specific product data sheets or Viiplus experts for precise application requirements.)

Uncertain which material or type suits your project? Our Bushing Material Selection Guide is designed to help, or Contact Us for a Free Quote and Expert Advice.

Why Partner with Viiplus? Expertise Meets Quality

Choosing the right supplier is as critical as choosing the right bushing. Here’s why companies worldwide trust Viiplus:

• Deep Expertise: Our foundation in metallurgy and tribology, coupled with a talented R&D team, means we understand the science behind reliable movement. We don't just sell; we solve friction challenges.

• Uncompromising Quality: We employ advanced manufacturing techniques (including sand casting, centrifugal casting, metal casting, investment casting) and a rigorous quality management system, ensuring every bushing meets the highest standards.

• Comprehensive Range: From standard metric sizes in JDB, SF, JF, and FB series to custom solutions including cylindrical, flange, double flange bushings, wear plates, and guide rails – we have the portfolio to match your needs.

• Global Reach, Seamless Logistics: Based in China, we ship sliding bearings worldwide. Our professional team handles customs clearance efficiently, ensuring smooth, timely delivery with all necessary documentation.

• Customer-Centric Approach: We believe in ethical practices and building trust. We offer flexible production (single units to large series), competitive pricing, and  online support.