Machining characteristics of forgings
The essence of forging processing is the use of a variety of metal plasticity and its development to produce plastic deformation capacity, with the help of network tools or dies, in the role of the applied impact or pressure, so that the billet forming, into a business with China a certain shape, size, internal management organization and mechanical properties can meet the design requirements of mechanical parts or blanks of an information processing technology method.
Forging processing has the following characteristics:
1. improve the organization structure and performance of forgings. After metal forging processing, its internal organization changes significantly, such as steel production ingot, its internal often exists a loose, coarse grain, organization structure is not uniform, the composition of the analysis of technical defects, forging pressure processing after the organization of loose forging, internal dense, fracture large dendrites, refining grain, improve the deviation. Forging formed forgings with good shape, dimensional stability, reasonable fiber organization, tissue refinement, improved the second phase distribution, greatly improving the forging plasticity, impact toughness and fatigue performance, forging and forging performance change range is small.
2. High utilization of material resources. Forging process is the use of various metals in the plastic state can be transferred through different volumes to achieve rapid forming to obtain a certain shape and size of the forging, without cutting, only a small amount of production process waste, high utilization of materials and equipment.
3. High precision dimensions for accuracy. Through the study of metal forging enterprises to obtain the workpiece structure size accuracy, forging margin is small, many countries forging technology methods to achieve the requirements of less cutting or no cutting. For example, precision forging bevel gears, the accuracy of its tooth shape can be directly used without cutting, precision forging blades of complex surfaces can only reach grinding accuracy.
4. Forging process is flexible, can be single piece or mass production, high productivity. For free forging, can be small batch or single piece production. At present, free forging is the main forging processing method for large forgings. For die forging, due to the continuous innovation and development of forging processing processing equipment and the improvement of mechanisation and automation control, die forging production is safe and productive and suitable for mass production. For example, it only takes 40s to forge an automotive six crank crankshaft on a 120,000kN hot-die forging press, and the number of high-speed punch strokes during the forging process reaches 1,500-1,800 times u002Fmin to forge and process M5mm screws on a planetary wire rolling machine, with a production efficiency of up to 12,000 pieces u002Fmin.
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