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FORGE-S
ETERNAL
The main drive shaft of the cement roller press penetrates the interior of the roller, connecting both ends with bearings and transmission components. It serves as the core shaft for the roller's rotation and is used for grinding brittle materials such as limestone, sandstone, shale, cement clinker, gypsum, and granulated blast furnace slag.It can be installed on cement grinding equipment manufactured by companies such as Pfeiffer (Germany), Polysius (Germany), and FLS (Denmark).
Material selection
It is required to possess high strength, high toughness, and good fatigue resistance. The commonly used material is 42CrMo. After quenching and tempering (quenching + high-temperature tempering), its tensile strength is ≥1000MPa and yield strength is ≥900MPa, meeting the requirements of heavy-duty transmission.
Precision requirement
The roundness, cylindricity, and coaxiality tolerances of the shaft must be controlled within 0.02mm, and the surface roughness Ra must be no greater than 0.8μm, to ensure precise mating with bearings and couplings and avoid vibration during operation.
Heat treatment and surface treatment
The heat treatment of drive shafts is divided into overall heat treatment and local heat treatment, with the core goal of achieving a performance match of "strong core and wear-resistant surface". The commonly used material is 42CrMo alloy structural steel.
1. Overall heat treatment: tempering treatment
Process flow: Quenching (heating to 850~870℃, oil cooling after heat preservation) + High-temperature tempering (heating to 580~620℃, air cooling after heat preservation)
Core role:Obtain a uniform tempered sorbite structure to ensure the overall strength and toughness of the shaft.
Meet the mechanical property requirements: tensile strength ≥1000MPa, yield strength ≥900MPa, impact toughness ≥60J/cm², and Brinell hardness HB280~320.
2. Local heat treatment: surface quenching (for key wear parts)
The parts of the drive shaft, such as the shaft neck (which fits with the bearing) and the shaft head spline/keyway (which connects with the coupling/gear), are prone to wear and require local surface quenching and strengthening.
Process type: Commonly used induction heating surface quenching
Process parameters: heating temperature 880~920℃, water spray cooling, hardened layer depth 2~5mm.
Performance requirements: The surface hardness should be HRC55~62, while the core should maintain the strength and toughness of the quenched and tempered state to avoid overall embrittlement.
The main drive shaft of the cement roller press penetrates the interior of the roller, connecting both ends with bearings and transmission components. It serves as the core shaft for the roller's rotation and is used for grinding brittle materials such as limestone, sandstone, shale, cement clinker, gypsum, and granulated blast furnace slag.It can be installed on cement grinding equipment manufactured by companies such as Pfeiffer (Germany), Polysius (Germany), and FLS (Denmark).
Material selection
It is required to possess high strength, high toughness, and good fatigue resistance. The commonly used material is 42CrMo. After quenching and tempering (quenching + high-temperature tempering), its tensile strength is ≥1000MPa and yield strength is ≥900MPa, meeting the requirements of heavy-duty transmission.
Precision requirement
The roundness, cylindricity, and coaxiality tolerances of the shaft must be controlled within 0.02mm, and the surface roughness Ra must be no greater than 0.8μm, to ensure precise mating with bearings and couplings and avoid vibration during operation.
Heat treatment and surface treatment
The heat treatment of drive shafts is divided into overall heat treatment and local heat treatment, with the core goal of achieving a performance match of "strong core and wear-resistant surface". The commonly used material is 42CrMo alloy structural steel.
1. Overall heat treatment: tempering treatment
Process flow: Quenching (heating to 850~870℃, oil cooling after heat preservation) + High-temperature tempering (heating to 580~620℃, air cooling after heat preservation)
Core role:Obtain a uniform tempered sorbite structure to ensure the overall strength and toughness of the shaft.
Meet the mechanical property requirements: tensile strength ≥1000MPa, yield strength ≥900MPa, impact toughness ≥60J/cm², and Brinell hardness HB280~320.
2. Local heat treatment: surface quenching (for key wear parts)
The parts of the drive shaft, such as the shaft neck (which fits with the bearing) and the shaft head spline/keyway (which connects with the coupling/gear), are prone to wear and require local surface quenching and strengthening.
Process type: Commonly used induction heating surface quenching
Process parameters: heating temperature 880~920℃, water spray cooling, hardened layer depth 2~5mm.
Performance requirements: The surface hardness should be HRC55~62, while the core should maintain the strength and toughness of the quenched and tempered state to avoid overall embrittlement.
