HIGmill Drive spares
Main Shaft and Rotor Support Assembly
Main Shaft and Rotor Support Assembly
The HIGmill main shaft transmits torque from the top drive to each grinding rotor stage. Main shafts, sleeves, connecting parts and multistage rotor assemblies can be identified separately and supplied to drawings.
Equipment Metso / Swiss Tower Mills HIGmill
Installation Position Centre of the vertical mill body, from the top drive to the grinding stages
Main Loads Torque, bending, cyclic loads and assembly stresses
Identification requirements Model, general arrangement drawing, main shaft drawing, interfaces and heat treatment
Part scopeIndividual Part Main shaft, sleeves, connecting parts or locking parts Assembly configuration Main shaft and multistage rotor support assembly Key accuracy requirements Coaxiality, runout, fits and surface roughness Inspection priorities Materials, heat treatment, UT/MT and dimensional reports
Identify the main shaft, protective parts and connecting parts separately
The main shaft carries loads and transmits torque. Shaft sleeves, coupling sleeves, keys, locking parts and rotor supports are separate mating parts. Specify whether the RFQ covers an individual shaft, mating parts or a complete assembly with multistage rotors.
Manufacturing review covers overall length, shaft diameters, coaxiality, runout, rotor interfaces, upper drive interface, surface condition, material, heat treatment, nondestructive inspection and dynamic balance requirements.
Functional zones
Manufacturing priorities by main shaft zone
The installed main shaft drawing governs the actual shaft sections and interfaces.
Upper drive interface
Check the connection, key or spline arrangement, fit dimensions, torque transmission and surface hardness requirements.
Bearing and seal journals
Control dimensional tolerances, roundness, roughness, wear repair limits and seal running surfaces.
Grinding rotor mounting sections
Check rotor location at each stage, spacing, connections, axial locking and assembly balance.
Materials and Processes
Coordinate alloy steel selection, forging and heat treatment
Specify the grade against the drawing. Material selection must satisfy strength, toughness, fatigue, hardenability, dimensional stability and site repair requirements together.
Alloy Steels for Drive Parts An initial material option for torque-transmitting and load-bearing shafts, subject to confirmation of shaft diameter, loads, heat-treated section size and fatigue requirements. Chromium-Molybdenum Alloy Steel For forgings requiring higher hardenability, strength, toughness and dimensional stability. The drawings and technical agreement govern composition, forging ratio and heat treatment.
Models and drawing
Applicable HIGmill configurations
Main shafts vary with power, chamber volume, shell diameter and grinding-stage configuration.
| HIGmill Model | Key identification details |
|---|---|
| HIG3500/23000 | Check the 3,500 kW drive, grinding-stage count, shaft diameter and rotor interfaces |
| HIG500/4000 | Check the 500 kW configuration, shaft sections and site modification version |
| HIG25 / HIG5 | Pilot and test configurations; do not infer dimensions from industrial units |
| Other industrial HIGmill models | Provide power, chamber volume, general arrangement drawing and main shaft interface data |
Match third-party drawing to the specific HIGmill model, main shaft version, drawing revision and key dimensions.
RFQ information
Main shaft identification information
Used shafts can support dimensional surveys, but wear and deformation must be assessed. Do not reproduce failed dimensions directly.
Equipment identification
OEM, full model, serial number and nameplate.
Shaft supply scope
Individual main shaft, mating parts or complete rotor assembly.
Drawings
OEM references, samples, drawing revisions and assembly relationships.
Key dimensions
Overall length, shaft diameters, interfaces, fits, tolerances and roughness.
Materials and processes
Current material, forging, heat treatment and surface hardening records.
Failure information
Wear, cracks, bending, vibration and repair history.
Related Equipment and Parts
Equipment, rotors and support system
Check the main shaft together with the installed model, grinding rotors, bearings and seal configuration.