Shanxi Jianing Forging has collected real-world engineering cases of long shafts, short shafts, drive shafts, and marine nuclear power shaft forgings, fully showcasing the forging process of shaft forgings, finished product precision, and practical application scenarios for heavy equipment.
A transmission machinery factory in Baiyin, Gansu, has long been engaged in the production and assembly of mechanical transmission components. Its main products have high requirements for the mechanical properties and dimensional accuracy of shaft forgings. In the use of products from existing suppliers, the factory often encountered issues such as uneven internal structure of finished shaft forgings and large deformation after heat treatment, which led to an increase in the scrap rate during machining and directly affected the overall assembly efficiency and equipment operation stability.
The plant faces three main difficulties in the procurement and use of shaft forgings: First, the hardness difference between the core and surface of shaft forgings is significant, making fatigue fracture prone to occurring when transmitting large torques; Second, the allowance design of forging blanks is not reasonable enough, resulting in material waste and extending the processing cycle; Third, supplier delivery cycles fluctuate greatly, making it difficult to implement production schedules, and multiple times forced to adjust schedules due to missing parts. These pain points prompted the factory management to seek more reliable suppliers of shaft forgings.
To address these pain points, Jianing Forging provides systematic solutions from three aspects: material selection, forging process, and heat treatment solutions. In terms of material control, using high-quality alloy steel and strictly analyzing chemical composition helps keep the fluctuation range of each batch of billet within international standards; In the forging process, a forming method combining multi-directional upsetting and precision forging is used to effectively refine grains and eliminate internal looseness, thereby increasing the overall density of the forging; In the heat treatment stage, based on the customer's hardness and toughness requirements for shaft forgings, specialized quenching and tempering or normalizing process parameters are developed to keep the hardness difference between the inside and outside of the forgings within HRC 3. In addition, Jianing Forging has established a stable billet inventory and flexible production scheduling mechanism, shortening the delivery cycle of regular orders by about 20% compared to the industry average, helping the factory reduce inventory pressure and support continuous production.
