The use of different materials for large-scale machining has different advantages

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 on the machine tool during use. In order to avoid the workpiece during the machining process. When the displacement is affected by external forces such as cutting force and gravity, a certain clamp must be used to clamp the workpiece to keep its fixed position unchanged.
The advantages of using Q235A (A3 steel) for large-scale machining
The main advantage of large-scale machining operations is that it has higher plasticity, toughness and welding performance at a certain level. The entire product has a certain stamping performance and cold bending performance. The main advantages are Used in mechanical parts and welded structural parts that are not demanding, such as tie rods, connecting rods, pins, shafts, screws, nuts, brackets, bases, etc.
Advantages of using 40Cr for large-scale machining
Large-scale machining will have very good comprehensive mechanical properties, low temperature impact toughness, low notch sensitivity, and good hardenability to a certain extent after quenching and tempering. Higher strength can be obtained when oil-cooled, and parts are prone to cracks when water-cooled. After tempering or quenching and tempering, the machinability is good, but the weldability is not good, and it is easy to produce cracks.
When the machine is used, it is mainly used for high-speed motion mechanical parts in the manufacturing process after quenching and tempering, such as its machine tool gears, shafts, worms, etc. After tempering and high-frequency surface quenching, it is used to manufacture parts with high surface hardness and wear resistance, such as gears, shafts, spindles, crankshafts, spindles, sleeves, pins, connecting rods, etc.
After quenching and tempering at medium temperature, it is used to manufacture heavy-duty, medium-speed moving mechanical parts, such as oil pump rotors, sliders, gears, spindles, etc. After quenching and low-temperature tempering, it is used to manufacture heavy-duty, low-impact, and wear-resistant mechanical parts, such as worms, spindles, and shafts. At the carbonitriding site, transmission parts with larger dimensions and higher low-temperature impact toughness, such as shafts, gears, etc., will be manufactured later.
The advantage of using 45# for large-scale machining
45# is a high-quality carbon structural steel, which is currently commonly used medium-carbon quenched and tempered steel.
It has very good comprehensive mechanical properties during operation. It has low hardenability during use, and is prone to cracks during water quenching. The welded parts need to be preheated before welding and annealing after welding.
Mainly used for: manufacturing high-strength mechanical moving parts, such as impellers, pistons, shafts, gears, racks, worms, etc.