Precision Forged Shaft Components - Core Basic Parts for Precision Transmission in Multiple Industries

I. Product Positioning

Precision forged shaft components are core transmission and load-bearing parts in fields such as general machinery, automotive industry, metallurgical equipment, and new energy equipment. They are made of high-quality alloy structural steel, carburizing steel, and quenched and tempered steel as base materials, through precision die forging forming, CNC precision machining, customized heat treatment, and surface strengthening processes. The product range includes stepped shafts, spline shafts, transmission shafts, output shafts, eccentric shafts and other types, specifically designed for power transmission, load bearing, and speed control. They undertake the key functions of torque transmission and positioning support, serving as basic components to ensure efficient, stable, and long-cycle operation of equipment, and are suitable for multi-scenario operations under high-speed, heavy-load, and complex working conditions.

II. Core Advantages

1. Integrated precision forming with excellent mechanical properties: Adopt precision die forging process to achieve near-net shape forming. The metal flow lines are continuously and completely distributed along the shaft contour without cutting or disorder. The material density is ≥99.5%, and the tensile strength is increased by more than 30% and the impact toughness by more than 25% compared with ordinary machined shafts. The base materials are high-quality alloy materials such as 42CrMo, 35CrMo, 20CrNiMo, and 12CrNi3A. Through targeted heat treatment (quenching and tempering, carburizing and quenching, induction hardening, etc.), multi-grade performance adaptation with tensile strength of 800-1800MPa and yield strength of 600-1500MPa can be achieved, which can stably withstand alternating loads, impact loads, and composite stresses.
2. High-precision control with strong assembly compatibility: Through precision machining processes such as CNC lathe turning, grinding, honing, and spline rolling, the key dimensional tolerance can reach IT6-IT7 grade (shaft diameter tolerance ≤±0.015mm), roundness error ≤0.008mm, straightness error ≤0.01mm/m, coaxiality of key mating surfaces ≤0.015mm, and surface roughness Ra≤0.4μm. High-precision machining ensures perfect adaptation with bearings, gears, couplings and other components, reduces assembly clearance and operational wear, and improves the overall transmission efficiency (≥98.5%).
3. Outstanding fatigue resistance and wear resistance with long service life: The surface is subjected to composite treatments such as shot peening, nitriding, chrome plating, or phosphating, which increases the fatigue strength by more than 40% and the fatigue life by ≥10⁷ cycles. It is not prone to cracks, fractures and other failure problems under high-frequency start-stop and continuous operation conditions. After local strengthening treatment, the surface hardness of wear-prone parts such as shaft necks and splines can reach HRC 50-62, and the wear resistance is 2-3 times higher than that of ordinary shafts, which greatly reduces the frequency of maintenance and replacement.
4. Customizable structure with wide scenario adaptability: According to customer equipment requirements, the shaft diameter (φ20-φ1000mm), shaft length (100-8000mm), structural form (stepped shaft, hollow shaft, spline shaft, eccentric shaft, flanged shaft, etc.) and connection method (flat key, spline, thread, pin connection, etc.) can be customized. It supports customized design for special working conditions such as high temperature (≤500℃), low temperature (≥-60℃), corrosive medium, dust and heavy load, adapting to the personalized needs of equipment in different industries.
5. High material utilization rate with significant cost advantages: The precision die forging process controls the machining allowance within 0.3-1.2mm, and the material utilization rate reaches more than 85% (only 50-60% for ordinary machining), which greatly reduces raw material consumption and subsequent processing man-hours, shortens the production cycle by more than 30%, and reduces the comprehensive procurement cost for customers.

III. Key Technical Parameters

IV. Application Fields

• Automotive industry: Engine crankshafts, camshafts, transmission shafts, gearbox input/output shafts, drive axle half-shafts, differential shafts;
• General machinery: Reducer shafts, motor shafts, water pump shafts, compressor shafts, machine tool spindles, lead screws;
• Metallurgical equipment: Rolling mill transmission shafts, roller table shafts, gearbox shafts, continuous caster conveyor shafts;
• New energy field: Wind power gearbox shafts, main shafts, photovoltaic equipment transmission shafts, energy storage equipment reducer shafts;
• Construction machinery: Hydraulic pump shafts, traveling mechanism shafts, slewing bearing shafts of excavators, loaders, cranes;
• Special equipment: Aerospace auxiliary equipment shafts, marine propulsion system shafts, mining machinery transmission shafts.

V. Quality Assurance

1. Select high-quality steel from well-known domestic and foreign steel mills, and provide material certificates, spectral analysis reports, and mechanical performance test reports to control the base material quality from the source;
2. The entire production process complies with the ISO 9001:2015 quality system, and automotive products additionally meet the IATF 16949 standard. Key processes (forging, heat treatment, precision machining) are equipped with online testing equipment to achieve 100% full inspection of processes;
3. Finished products undergo non-destructive testing such as ultrasonic testing (UT), magnetic particle testing (MT), and penetrant testing (PT) to ensure no internal cracks, inclusions, pores and other defects. At the same time, complete inspections such as dimensional accuracy, hardness, and dynamic balance (accuracy grade ≤G2.5) are completed;
4. Provide one-stop services from product design (including 3D modeling, finite element analysis, strength verification), mold development, sample trial production to mass production. Free technical support and fault diagnosis are provided during the warranty period, product repair and renovation services are supported, and third-party testing reports can be provided according to customer needs.