INDUSTRY COMPONENT

Moldboard

A moldboard is the primary cutting and grading blade on a motor grader, designed to move and shape soil, gravel, or other materials.

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Component Specifications

Definition
The moldboard is a critical structural component of a motor grader, typically a large, curved steel blade mounted at the front or between the axles. It functions as the main earthmoving tool, capable of cutting, spreading, leveling, and grading terrain through hydraulic or mechanical control of its angle, tilt, and height. Its design optimizes material flow and minimizes drag during operation.
Working Principle
The moldboard operates by being positioned at a specific angle (cutting angle) and tilt relative to the direction of travel. As the motor grader moves forward, the leading edge of the blade cuts into the material. The curved profile then lifts and rolls the material, directing it along the face of the blade to the side for spreading or windrowing. Hydraulic cylinders control the blade's pitch, tilt, and side-shift, allowing precise grading and contouring.
Materials
High-strength, abrasion-resistant steel (e.g., AR400 or AR500 steel plate). Often includes hardened cutting edges or replaceable wear parts (e.g., end bits, cutting edges) made from alloy steel or tungsten carbide for durability.
Technical Parameters
  • Height Approximately 0.6m to 1.0m (24 to 40 in)
  • Length Typically 3.0m to 7.3m (10 to 24 ft), depending on grader size
  • Weight 500 kg to 3000 kg (1100 to 6600 lbs)
  • Thickness 20mm to 40mm (0.75 to 1.5 in) for the main plate
  • Mounting Type Circle drawbar or direct hydraulic mount
  • Curvature Radius Designed for optimal material flow, often specific to manufacturer
Standards
ISO 7134, DIN EN 474-6

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Moldboard.

motor grader moldboard grader blade earthmoving blade grading blade moldboard specifications moldboard replacement construction equipment parts Moldboard Moldboard in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Motor Grader

A heavy-duty construction machine with a long blade used to create flat surfaces.

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Engineering Analysis

Risks & Mitigation
  • Wear and abrasion leading to reduced efficiency
  • Impact damage from rocks or debris
  • Fatigue cracking due to cyclic loading
  • Improper operation causing blade distortion or failure
FMEA Triads
Trigger: Abrasive material contact
Failure: Excessive wear on cutting edges and blade surface, leading to loss of grading precision and increased fuel consumption
Mitigation: Use replaceable wear parts (edges, end bits), select appropriate material (AR steel), implement regular inspection and maintenance schedules
Trigger: Overloading or hitting immovable objects
Failure: Bending, cracking, or structural failure of the moldboard
Mitigation: Train operators on proper techniques, use grade control systems, ensure hydraulic relief valves are functional, design with safety factors
Trigger: Corrosion in wet or saline environments
Failure: Thinning and weakening of steel, leading to premature failure
Mitigation: Apply protective coatings (e.g., paint, galvanization), use corrosion-resistant materials, store equipment properly when not in use

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerances per manufacturer specifications (e.g., flatness within ±3 mm over blade length, mounting hole alignment within ±1.5 mm). Material hardness typically 400-500 HB for AR steel.
Test Method
Non-destructive testing (NDT) such as ultrasonic testing for cracks, hardness testing (Brinell or Rockwell), dimensional verification with laser scanning or templates, and load testing for hydraulic functions.

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between a moldboard and a bulldozer blade?

A moldboard on a motor grader is designed for precision grading, leveling, and spreading, with adjustable angles for fine control. A bulldozer blade is typically larger, heavier, and designed for pushing large volumes of material with less precision, often fixed or with limited tilt adjustments.

How often should moldboard cutting edges be replaced?

Replacement frequency depends on material abrasiveness and usage. In high-abrasion conditions (e.g., rocky soil), edges may need replacement every 100-500 operating hours. Regular inspection for wear and damage is recommended to maintain grading efficiency and prevent damage to the main blade.

Can moldboards be customized for specific tasks?

Yes, moldboards can be customized with different lengths, curvatures, or specialized attachments (e.g., snow wings, extensions) for tasks like snow removal, fine grading, or heavy-duty excavation. Manufacturers often offer options based on application requirements.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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Moisture indicator window Monitoring Interface