The High-Torque Gearbox Shaft Free Forging is a precision-engineered forged component designed for the extreme demands of mining equipment gear systems. Manufactured using high-strength alloy steels such as 42CrMo,20CrMnTi, this shaft is built to transmit heavy loads, resist shock impacts, and operate reliably under continuous high-torque conditions.
Free forging ensures excellent internal grain flow and metallurgical consistency, enhancing the shaft’s fatigue life, resistance to torsional stress, and dimensional stability. Its robust performance makes it ideal for use in planetary gear reducers, crusher transmissions, and dragline drive systems.
Key Features:
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Open-die forging for superior structural integrity and toughness
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Custom geometries including splines, shoulders, steps, and flange ends
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Heat-treated to achieve optimum balance of strength, ductility, and hardness
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Machined journals and sealing surfaces ready for final assembly or grinding
Applications:
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Gearbox shafts in underground and open-pit mining equipment
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Drive shafts in crushers, conveyors, drilling machines, and excavators
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Power transmission components for heavy-duty mineral processing systems
| Item |
Details |
| Product Name |
High-Torque Gearbox Shaft Free Forging for Heavy-Duty Mining Equipment Drives |
| Material Grades |
- High-strength alloy steels: 42CrMo,20CrMnTi - Excellent torsional strength, fatigue resistance, and shock absorption under high-load mining conditions |
| Forging Equipment |
- Hydraulic hammers: 5T / 8T / 12T - 3600T open-die forging press for long, stepped, and spline shaft configurations - Supports forging of complex profiles with integrated shoulders and flanges |
| Manufacturing Process |
Hot Forging → Quenching + Tempering / Normalizing → Ultrasonic Testing → Rough / Semi-Finish Machining → Dimensional & Surface Inspection |
| Forging Ratio |
≥ 3.0 — Enhances directional grain flow for superior resistance to bending, torsion, and fatigue in dynamic mining operations |
| Applications |
- Gearbox shafts in crushers, conveyors, loaders, and drilling rigs - Planetary gear stages and main drives in mineral processing machinery - Rotary components subject to high torque and repeated load cycles |
| Heat Treatment Options |
- Quenched + Tempered for strength, ductility, and wear resistance - Normalizing for grain refinement and machining stability - Optional stress relieving prior to precision finishing |
| Testing & Inspection |
- Chemical: Alloy composition via spectrometer analysis - Mechanical: Hardness, tensile strength, yield, and Charpy impact (axial & transverse) - Ultrasonic (UT): 100% full-length internal flaw detection - Dimensional: Runout, straightness, keyway accuracy, shoulder-to-shoulder length |
| Value-Added Services |
- Pre-machining: splines, steps, threads, shoulders, bearing journals -Full traceability: heat number, forging batch, inspection documentation |
The steel forgings production flow:
Raw material steel ingot into warehouse(test the chemical composition) → Cutting→ Heating(Furnace temperature test) → Heat treatment after forging(Furnace temperature test) Discharge the furnace(blank inspection)→ Machining→ Inspection(UT,MT,Visal dimension, hardness)→ QT→ Inspection(UT, mechanical properties, hardness, grain size)→ Finish machining→ Inspection (dimension)→ Packing and Marking(steel stamp, mark)→ Storage Shipment.
Frequently Asked Questions (FAQs)
1. What is your forging weight range?
We produce forged parts ranging from 100 kg to 7000 kg.
2. Do you provide heat treatment and machining?
Yes, we offer full in-house heat treatment, rough, and finish machining services.
3. Which industries do you supply to?
We serve wind energy, heavy equipment, port machinery, transmission systems, and more.
4. What is your production lead time?
With stock: Around 30 days
Without stock: 40–45 days
5. Where is your factory located?
In Changzhou City, near Shanghai, with shipping via Shanghai Port.
Request a Quote
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