SAG MILL INNER HEAD LINER
Inner Feed Head Liner
Inner feed head wear sectors · Specified by segment geometry, hole pattern and adjoining interfaces
Connects the feed throat to the outer feed head liners, protecting the inner head against feed impact and cyclic loads from the grinding media.
Part Function
Sector geometry Inner and outer radii, circumferential angle, curvature and liner thickness
Working profile Axial profile, lifter ribs, transition surfaces and wear allowance
Fastening interface Hole positions, counterbores, seating surfaces, bolts and rear contact
Arrangement within the set Segment count, position numbers, orientation and adjoining liner references
Connect the throat to the outer head ring for continuous head protection
Inner feed head liners are generally sector plates arranged in an annular zone. They must seat against the mill head and maintain continuous transitions to the throat liner, outer head liners and shell liners.
Check the complete set for segment count, circumferential angles, inner and outer radii, axial height differences, hole positions and orientation. A single segment's appearance cannot establish interchangeability.
Position and Performance
The inner ring takes more direct impact; continuous interfaces are equally critical
Material and profile must jointly meet fracture resistance, wear resistance and head assembly requirements.
Throat transition edge
Check large-particle impact, inner-edge wear, steps and gaps between adjoining parts to avoid concentrated local impact.
Head working surface
Check overall sector wear, rear support, stresses around holes and safe remaining thickness.
Outer-ring interface edge
Check height differences, overlaps and arrangement continuity with outer head and shell liners to prevent uneven wear and looseness.
Materials and Manufacturing Processes
Balance impact toughness, profile retention and component weight
The following are candidate material families. Confirm the final material, heat treatment and acceptance criteria against the drawings, operating conditions and technical agreement.
Mill lining literature distinguishes the feed end, shell and discharge end as separate functional areas. Confirm materials and profiles for each area against the installed equipment and failure records. Metso Mill Liners
Failure Diagnosis
Address uneven sector wear, cracks around holes and interface steps separately
Record position numbers and wear profiles for the complete set to identify material or arrangement problems.
| Observed condition | Priority checks | Improvement Options |
|---|---|---|
| Inner edge wears substantially faster than the outer edge | Feed impact point, throat interface, axial height differences, rotation direction and ore size | Adjust transition profiles and materials by zone, and restore continuity between adjoining parts |
| Cracking around bolt holes | Hole positions, counterbores, radii, rear contact, preload, hardness and casting quality | Improve toughness, support, transitions around holes and nondestructive inspection |
| A loose segment or slurry leakage | Grip length, washers, seals, seating surfaces, bolt elongation and gaps between adjoining segments | Restore the complete fastening and sealing system, and record installation parameters by position |
| Large circumferential variations in wear | Segment positions, uneven feed flow, arrangement, shell rotation direction and material differences between batches | Assign position numbers and map wear, then optimize profiles and materials by zone |
Drawing References and Inquiry Details
Identify each liner by installed mill, position number and drawing revision
Match confirmed OEM drawing references, third-party drawing references and spare part numbers to the equipment model, installed position and revision.
Equipment identification
OEM, series, full model, serial number, year, feed-end version and modification history.
Position and Identification
Position numbers, segment count, OEM drawing references, third-party drawing references, spare part numbers and drawing revisions.
Key dimensions
Inner and outer radii, angle, liner thickness, axial profile, hole positions and diameters, weight and orientation.
Adjacent Interfaces
Throat liner, outer head liners, shell liners, overlaps, height differences, gaps and fasteners.
Material and Service Life
Current material, hardness, heat treatment, composite construction, installation date, service life and remaining thickness.
Operating Conditions and Failure Modes
Ore, feed size, steel balls, throughput, uneven wear, cracks, looseness and site photographs.
Related Equipment and Parts
Connect equipment, OEM configuration, lining system and materials
The general equipment route explains positions and materials; the OEM route identifies series, models and drawing references.
SAG Mill Lining Systems Explore the complete feed-end, shell, discharge and drive system. Feed Throat Liner Check the feed passage wear parts adjoining the inner ring liners. SAG Mill Equipment Explore the complete machine structure and component locations. Metso SAG Mill Equipment Use the brand, series and model to identify the drawing reference.
Request a SAG Inner Feed Head Liner Proposal and Quotation
Provide the full model, position number, drawing reference, drawings, photographs of used parts, key dimensions, material, operating conditions and service-life records.
Manufacturing Services in China
From Technical Assessment to Finished-Part Delivery
Technical advice, supplier introductions, quality control and finished-part delivery.
Technical Advice
Review the installed equipment, position, interfaces, materials, operating conditions and failures.
Supplier Introductions
Coordinate production of wear-resistant castings, rubber composites, machined parts and fasteners.
Quality Control
Track materials, heat treatment, dimensions, hole positions, nondestructive inspection, weight and trial assembly.
Finished-Part Delivery
Deliver a complete set organized by position number, with fasteners, identification, inspection records and installation documents.