Large machinery processing uses different materials to have different advantages, Nanjing Precision Engineering Co., ltd

by:NJPE     2020-02-18
In order to meet the technical requirements of its customers during the operation of large-scale machining, the workpiece must be effectively positioned at a fixed position of the machine tool during operation, in order to avoid the displacement of the workpiece under the influence of external forces such as cutting force and gravity during machining, a certain fixture must be used to clamp the workpiece, keep its fixed position unchanged. Large mechanical processing the Q235A (A3 steel) The main advantages of large-scale machining in operation are that it has higher plasticity, toughness and welding performance in a certain layer, the whole product has certain stamping performance and cold bending performance, and is mainly used in mechanical parts and welded structural parts with low requirements when running, for example, its pull rod, connecting rod, pin, shaft, screw, nut, bracket, base, etc. The advantage of adopting 40Cr in large-scale mechanical processing large-scale mechanical processing will have very good comprehensive mechanical properties, low-temperature impact toughness and low notch sensitivity to a certain extent after quenching and tempering, good hardenability. High strength can be obtained when the oil is cold, and parts are easy to crack when the water is cooled. After tempering or tempering, The machinability is good, but the weldability is not good and cracks are easy to occur. When the machine is used, it is mainly used for mechanical parts that move rapidly in the manufacturing process after quenching and tempering, such as machine tool gears, shafts, worms, etc. After quenching and tempering and high-frequency surface quenching, it is used to manufacture parts with high surface hardness and wear resistance, such as gears, shafts, main shafts, crankshafts, mandrels, sleeves, pins, connecting rods, etc. After quenching and tempering at medium temperature, it is used to manufacture mechanical parts with heavy load and medium speed, such as oil pump rotor, slider, gear, main shaft, etc. After quenching and low temperature tempering, it is used to manufacture heavy-duty, low impact and wear-resistant mechanical parts, such as worm, main shaft, shaft, etc. After Carbonitriding, transmission parts with larger size and higher low-temperature impact toughness, such as shafts and gears, are manufactured. The advantage of using 45 # for large-scale mechanical processing 45 # is high-quality carbon structural steel, which is currently the most commonly used medium carbon quenched and tempered steel. In the process of operation, it will have very good comprehensive mechanical properties. When it is used, it has low hardenability, and cracks are easy to occur during water quenching. The welded parts need to be preheated before welding, annealing is required after welding. Mainly used for: manufacturing high-strength mechanical motion parts, such as impeller, piston, shaft, gear, rack, worm, etc.
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