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FORGE-S
ETERNAL
The transmission shaft of bucket wheel excavator is the core heavy-duty component for power transmission of the whole machine, suitable for extreme working conditions in open-pit mines and large-scale earthworks. Its design, production, and processing are all focused on the core requirements of anti heavy load, anti impact, wear-resistant, and high rigidity.
Feature
Heavy duty anti torsion,
strong impact resistance
Excellent axis compensation capability
High rigidity
low vibration
Good compatibility between sealing and lubrication
High structural integration
Application
Bucket wheel drive mechanism: transmits the torque of the driving motor/hydraulic motor to the bucket wheel, drives the bucket wheel to rotate for excavation and material retrieval, and needs to withstand the alternating impact torque and radial load during excavation;
Rotary mechanism: connects the rotary platform and the walking base to achieve 360 ° rotation of the entire machine, bearing the platform's own weight and operating load while transmitting rotary power, with extremely high requirements for anti torsion and anti bending strength;
Walking mechanism: drives the movement of equipment tracks/wheels, adapts to the bumpy working conditions of mining uneven roads, bears dynamic loads, impact loads, and composite stresses, and is the "power axis" for equipment movement.
Product Procedure
Forging,normalizing,rough machining,quenching and tempering,final machining,inspection and package.
Heat Treatment&Surface Treatment
The heat treatment of the transmission shaft of bucket wheel excavator is centered on improving the toughness, surface strength and wear resistance of the core, and is divided into two steps: overall heat treatment (quenching and tempering) and local surface heat treatment. The core materials are 42CrMo (mainstream) and 35CrMo,
core principle
The core maintains good toughness (impact energy Ak ≥ 40J) to prevent impact fracture; Surface/key mating surfaces have increased hardness (HRC45~55), enhancing wear resistance and anti bite properties; Eliminate processing stress and prevent subsequent deformation.
Overall quenching and tempering heat treatment (core performance enhancement)
| Material | quenching | tempering | core performance after quenching and tempering |
| 42CrMo | oil quenching at 850~870 ℃, with insulation time calculated based on the effective thickness of the workpiece (1.5~2min/mm), to ensure that the core is fully quenched | High temperature tempering at 580-620 ℃, insulation for 2-4 hours, air cooling | Hardness HB280~320, tensile strength ≥ 1000MPa, impact energy Ak ≥ 45J |
| 35CrMo | oil quenching at 830~850 ℃, holding time 1-1.5min/mm | High temperature tempering at 550~590 ℃, insulation for 2~3 hours, air-cooled | Hardness HB240~280, tensile strength ≥ 850MPa, impact energy Ak ≥ 40J |
2. Local surface heat treatment (strengthening of key areas)
For parts that are prone to wear and impact such as shaft necks, spline tooth surfaces, and flange mating surfaces, local surface heat treatment is carried out to avoid increased brittleness caused by overall quenching. There are two mainstream processes:
Induction hardening+low-temperature tempering
Process: Medium frequency induction heating (frequency 250~500kHz) is used, with a heating temperature of 880~920 ℃. After quenching, it is immediately subjected to low-temperature tempering at 200~220 ℃ for 1~2 hours;
Effect: Surface hardness HRC50~55, hardened layer depth 2-5mm, smooth transition layer, no quenching cracks, suitable for journal and bearing mating surfaces;
Gas nitriding+low-temperature tempering
Process: Gas nitriding at 520-560 ℃, insulation for 15-25h, nitriding layer depth of 0.3-0.8mm, followed by low-temperature tempering at 180-200 ℃;
Effect: Surface hardness HV800~1000, excellent wear resistance, no deformation, suitable for spline tooth surface and precision flange mating surface (not suitable for strong impact parts).
The transmission shaft of bucket wheel excavator is the core heavy-duty component for power transmission of the whole machine, suitable for extreme working conditions in open-pit mines and large-scale earthworks. Its design, production, and processing are all focused on the core requirements of anti heavy load, anti impact, wear-resistant, and high rigidity.
Feature
Heavy duty anti torsion,
strong impact resistance
Excellent axis compensation capability
High rigidity
low vibration
Good compatibility between sealing and lubrication
High structural integration
Application
Bucket wheel drive mechanism: transmits the torque of the driving motor/hydraulic motor to the bucket wheel, drives the bucket wheel to rotate for excavation and material retrieval, and needs to withstand the alternating impact torque and radial load during excavation;
Rotary mechanism: connects the rotary platform and the walking base to achieve 360 ° rotation of the entire machine, bearing the platform's own weight and operating load while transmitting rotary power, with extremely high requirements for anti torsion and anti bending strength;
Walking mechanism: drives the movement of equipment tracks/wheels, adapts to the bumpy working conditions of mining uneven roads, bears dynamic loads, impact loads, and composite stresses, and is the "power axis" for equipment movement.
Product Procedure
Forging,normalizing,rough machining,quenching and tempering,final machining,inspection and package.
Heat Treatment&Surface Treatment
The heat treatment of the transmission shaft of bucket wheel excavator is centered on improving the toughness, surface strength and wear resistance of the core, and is divided into two steps: overall heat treatment (quenching and tempering) and local surface heat treatment. The core materials are 42CrMo (mainstream) and 35CrMo,
core principle
The core maintains good toughness (impact energy Ak ≥ 40J) to prevent impact fracture; Surface/key mating surfaces have increased hardness (HRC45~55), enhancing wear resistance and anti bite properties; Eliminate processing stress and prevent subsequent deformation.
Overall quenching and tempering heat treatment (core performance enhancement)
| Material | quenching | tempering | core performance after quenching and tempering |
| 42CrMo | oil quenching at 850~870 ℃, with insulation time calculated based on the effective thickness of the workpiece (1.5~2min/mm), to ensure that the core is fully quenched | High temperature tempering at 580-620 ℃, insulation for 2-4 hours, air cooling | Hardness HB280~320, tensile strength ≥ 1000MPa, impact energy Ak ≥ 45J |
| 35CrMo | oil quenching at 830~850 ℃, holding time 1-1.5min/mm | High temperature tempering at 550~590 ℃, insulation for 2~3 hours, air-cooled | Hardness HB240~280, tensile strength ≥ 850MPa, impact energy Ak ≥ 40J |
2. Local surface heat treatment (strengthening of key areas)
For parts that are prone to wear and impact such as shaft necks, spline tooth surfaces, and flange mating surfaces, local surface heat treatment is carried out to avoid increased brittleness caused by overall quenching. There are two mainstream processes:
Induction hardening+low-temperature tempering
Process: Medium frequency induction heating (frequency 250~500kHz) is used, with a heating temperature of 880~920 ℃. After quenching, it is immediately subjected to low-temperature tempering at 200~220 ℃ for 1~2 hours;
Effect: Surface hardness HRC50~55, hardened layer depth 2-5mm, smooth transition layer, no quenching cracks, suitable for journal and bearing mating surfaces;
Gas nitriding+low-temperature tempering
Process: Gas nitriding at 520-560 ℃, insulation for 15-25h, nitriding layer depth of 0.3-0.8mm, followed by low-temperature tempering at 180-200 ℃;
Effect: Surface hardness HV800~1000, excellent wear resistance, no deformation, suitable for spline tooth surface and precision flange mating surface (not suitable for strong impact parts).
