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Classification of forging equipment based on the transmission method

2020-01-03View Original

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Depending on the method of transmission, forging equipment can be divided into hammers, hydraulic presses, crank presses, rotary forging machines, and screw presses. Currently, the air hammers used in China range from 30 to 1,000 kilograms, while the steam-air free forging hammers weigh between 1 and 5 tons; they are mainly used in the production of forgings. Steam-air die forging hammers range from 1 to 16 tons and are used in the machinery manufacturing industry for producing various die-forged parts. In addition, there are also spring hammers, belt hammers, wire hammers, and plate hammers. In recent years, highly efficient hydraulic hammers have also been developed abroad. Forging hydraulic presses were invented in the mid-19th century and have since become important equipment for forging processes in the metallurgical and machinery industries. Their stroke speed is approximately 50 to 150 millimeters per second, and they operate on a static pressure principle ; The pressure of the working fluid is generally 200 to 400 atmospheres. The main parameter of a hydraulic press is the nominal pressure, which indicates the maximum pressure that the press can generate. The nominal pressure of hydraulic presses used for free forging is usually 500–10,000 tons, while those used for die forging range from 1,000–75,000 tons. In recent years, the operation of hydraulic presses has been automated using computers. Crank presses are a widely used type of forging equipment, with a variety of structural designs available. ①Ordinary crank presses are mainly used for producing stamped parts ; ②Hot die forging crank presses are used to produce hot die forged parts ; ③Cold heading machines are used for processing various standard cold-headed parts ; ④Drawbench presses are used for drawing sheet metal ; ⑤Cold extrusion presses are used for various cold-extruded parts ; ⑥Precision presses are used for the processing of high-precision parts ; ⑦Hand forging machines are used for local upsetting of long rod-shaped forgings, as well as upsetting and punching of ring-shaped parts. The main parameter of a crank press is the nominal pressure, which indicates the maximum force permissible on the slider. The working mechanism of a rotary forging machine performs rotational motion, and it is mainly used for forging various shaft-type forgings as well as for shaping blanks. Screw presses include friction screw presses and hydraulic screw presses. (1) Friction presses are driven by friction discs; they represent a type of die forging and stamping equipment with a simple structure that is widely used today, with nominal pressures ranging from 63 to 1250 tons. (2) The hydraulic screw press is a high-efficiency die forging equipment that has been developed in recent years, with a nominal pressure of up to 6,300 tons. Screw presses have poor performance under eccentric loads and are generally used only for single-cavity die forging. To improve the capacity of such presses to withstand eccentric loads, twin-screw hydraulic screw presses were developed. Since the 1960s, large-tonnage rapid forging hydraulic presses have been developed, and precision forging machines have also been used to improve the surface quality and dimensional accuracy of forgings. Therefore, the range of forging billet specifications is continuously expanding, and the variety of forgings is increasing day by day.

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