Viiplus Oil-Free L-Gibs – Copper Alloy with Graphite Embedded

Overview of Oil-Free Mold Components, Guided Ejector Bushings – Self-Lubricating, GRAPHITE PLUGGED

Viiplus Oil-Free mold components—including Ejector Guide Bushes, STD Guide Rails, STD Wear Pads, and Oil-Free L-Gibs—are self-lubricating precision parts designed for Injection Molding Machines.

Ejector Leader Bush standard bushing for plastic injection mold Bronze with graphite plugs, Die Bushings – Self-Lubricating, Finish Ground, Self Lubricating, L-Gibs, Bronze/Graphite

Solid Bronze Self Lubricating Guided Ejector Bushings are available in nominal diameters ranging from METRIC SIZE to INCH SIZE. The self-lubricating graphite plugs eliminate the need for grease which makes these bushings perfect for food grade, medical and high speed applications.

These components are manufactured from copper alloys with embedded graphite plugs, typically based on bronze materials such as CuZn25Al6Fe3Mn3 or SO#50 SP2.
They enable oil-free operation, significantly reducing friction, wear, and maintenance requirements.

Self lubricating leader pin bushings (bronze/graphite)， Mold Components Key Industries Served

• Automotive (interior & exterior plastic parts)

• Home Appliances (thin-wall housings, buttons, panels)

• Electronics & Medical Devices (clean, contamination-free molding)

Oil-free mold components are essential in industries requiring high-speed, high-precision, and clean production, where oil contamination is unacceptable.

Specific Parts Applications in Injection Molds

These components are installed in critical sliding and guiding zones of injection molds, ensuring smooth mold opening, closing, sliding, and ejection.

Ejector Guide Bush

Installation Position

• Mounted on the Ejector Plate, including:

  • Upper Plate

  • Lower Plate

• Can be designed using:

  • Spacer method

  • Lower Plate as Master

  • Upper Plate as Master

Function & Application

• Guides ejector pins or ejector plate movement during the injection cycle.

• Ensures stable and precise ejection of molded parts such as:

  • Automotive dashboard components

  • Appliance housings

Performance Benefits

• Prevents jamming and misalignment of ejector pins

• Ensures accurate and repeatable ejection

• Oil-free design suitable for:

  • Food-grade molds

  • Medical molds

  • High-speed injection molding

Operating temperature: 0–170°C
Compatible ejector plate thickness: 15–50 mm

STD Guide Rails

Installation Position

• Installed on the mold base or locking mechanisms

• Used as:

  • L-shaped guide rails

  • Linear guide rails

• Positioned between mold halves or sliding structures

Function & Application

• Guides mold opening and closing

• Maintains precise alignment of:

  • Slides

  • Cores

• Widely used in:

  • Automotive molds (e.g., bumpers)

  • Appliance molds (e.g., refrigerator handles)

Performance Benefits

• Reduces mold wear under heavy loads

• Ideal for low-speed, heavy-load applications

• Customizable:

  • Length

  • Hole spacing

  • Lubrication grooves

• Surface hardness up to 58 HRC for extended service life

STD Wear Pads

Installation Position

• Installed on sliding contact surfaces, such as:

  • Slide plates

  • Keeper blocks

  • Mold contact zones

Function & Application

• Absorbs wear generated during mold sliding motion

• Commonly used in:

  • High-volume molds

  • Cams and slide systems

• Ideal for:

  • Appliance housings

  • Automotive interior components

Performance Benefits

• Provides a durable wear surface

• Minimizes downtime and maintenance

• Self-lubricating design performs reliably in:

  • High-temperature

  • High-pressure

  • Harsh operating environments

Oil-Free L-Gibs

Installation Position

• Used in Gib assemblies

• Installed along mold edges or corners

• Acts as an L-shaped support guide for:

  • Slides

  • Cams

  • Linear motion systems

Function & Application

• Controls heavy-load linear motion

• Suitable for:

  • Injection molds

  • Metal stamping dies

• Typical applications include:

  • Automotive lighting housings

  • Washing machine panels

Performance Benefits

• Supports very high surface loads (>750 N/mm²)

• Excellent resistance to deformation

• Suitable for:

  • Outdoor molds

  • Heavy-duty industrial equipment

• No pre-drilled holes required

• Fully customizable shapes and dimensions

Integrated Solutions & Advantages

Overall Performance Benefits

• Self-lubricating technology
  Graphite plugs form a solid lubrication film
  Friction coefficient: 0.12–0.16

• Oil-free operation

  • Eliminates contamination

  • Reduces maintenance

• Prevents galling and seizure

• Extends mold service life

• Enhances production efficiency

Operating Capability

• High-speed operation

• Heavy-load conditions

• Wide temperature range: –40°C to +300°C

Industry-Specific Advantages

Automotive Industry

• Supports molding of complex interior parts

• Reduces surface defects

• Improves dimensional stability

Home Appliance Industry

• Ideal for thin-wall parts (buttons, panels)

• Ensures smooth surface finish and precision

Medical & Electronics Industry

• Oil-free, contamination-free molding

• Meets clean manufacturing requirements

Installation & Customization Options

• Precision cutting and casting available

• Custom shapes and tolerances

• Optional MoS₂ additives for enhanced lubrication

• Tailored designs based on mold structure and load conditions

Material Selection for Oil-Free Mold Components

Typical Materials

• Bronze-based copper alloys:

  • CuZn25Al5Mn4Fe3

  • CuZn25Al6Fe3Mn3

  • Aluminum bronze (C959)

  • CA954 with oil impregnated graphite plugs

• Embedded graphite plugs for solid lubrication

Material Properties, Selection Rationale & Applications

High Strength

• Tensile strength: >750 N/mm²

• Hardness: >210 HB

• Resists heavy loads and mechanical stress

• Superior to steel in corrosion resistance and wear behavior

Applications:
Heavy-duty guide rails and gibs in injection molds

Self-Lubrication

• Graphite provides continuous dry lubrication

• No external grease required

• Low friction under high temperature and pressure

Applications:
Clean production environments (automotive, appliances, medical)

Wear & Corrosion Resistance

• Embedded graphite ensures long-term lubrication

• Extended service life

• Optional alloys:

  • Phosphor bronze

  • Nickel aluminum bronze

Applications:
High-volume molds, outdoor or corrosive environments

Thermal Conductivity & Compatibility

• Excellent heat dissipation

• Stable performance during injection molding thermal cycles

Applications:
High-speed injection molding operations

Material Selection Guidelines

Material choice is based on:

• Load conditions

• Sliding speed

• Environmental factors

Recommendations

• High-strength brass or aluminum bronze for heavy loads

• Graphite + MoS₂ for enhanced lubrication

• Custom alloys (e.g., silicon bronze) for special applications

This approach ensures the optimal balance between performance, durability, and cost efficiency.