Large-scale machining in the process of operation in order to meet the technical requirements of its customers workpiece, in the use of the workpiece must be effectively positioned in a fixed position of the machine tool, in order to avoid the workpiece in the machining process by cutting force, gravity and other external forces and displacement, it is necessary to use a certain fixture to clamp the workpiece, so that its fixed position remains unchanged. What are the advantages of using different materials for large machining?
The advantages of using Q235A (A3 steel) for large machining
The main advantage of large machining in the operation of a certain degree of plasticity, toughness and welding performance, the entire product has a certain stamping performance and cold bending performance, in the use of mechanical parts and welding structure is mainly used in the requirements of the less demanding parts, such as its tie rods, connecting rods, pins, shafts, screws, nuts, brackets, bases, etc..
The advantages of using 40Cr for large machining
Large-scale machining in a certain degree after the tempering process will have very good overall mechanical properties and low temperature impact toughness and low notch sensitivity, good hardenability. Oil cooling can be obtained when the higher strength, water-cooled parts are prone to cracking. Good machinability after tempering or quenching, but bad weldability and easy to produce cracks.
In the use of models mainly after tempering treatment for its manufacturing process of its speed movement of mechanical parts, such as its machine tool gears, shafts, worm gears, etc.. After quenching and high frequency surface quenching is used in the manufacture of parts with high surface hardness and wear resistance, such as gears, shafts, spindles, crankshafts, mandrels, sleeves, pins, connecting rods, etc.
After quenching and medium-temperature tempering for the manufacture of heavy-duty, medium-speed mechanical parts, such as oil pump rotors, sliders, gears, spindles, etc. After quenching and low-temperature tempering for the manufacture of heavy-duty, low-impact, wear-resistant mechanical components, such as worm gears, spindles, shafts, etc. Carbonitriding process that is after the manufacture of larger size, low-temperature impact toughness of the transmission parts, such as shafts, gears, etc.
The advantages of using 45# for large machinery processing
45# is a high-quality carbon structural steel, is currently the most commonly used medium carbon tempered steel.
In the process of operation will have very good overall mechanical properties, in the use of its low hardenability, water quenching is easy to produce cracks, welded parts need to be preheated before welding, after welding need to be annealed.
Mainly used for: the manufacture of high-strength mechanical moving parts, such as impellers, pistons, shafts, gears, racks, worm gears, etc.