Gear is a basic mechanical part widely used to transmit power and change the speed and direction of movement. It is widely used in the machinery industry, especially in the fields of automobile, ship, aerospace, machine tool manufacturing and so on. According to the shape, it can be divided into cylindrical gear, conical gear (or bevel gear), rack, worm gear and so on. Traditional gear production mainly adopts cutting processes such as gear turning, gear milling, gear hobbing, gear shaping and gear shaving to obtain the tooth shape, and the use of these processing methods will lead to the waste of a large number of raw materials (the average utilization rate of materials is only 45% ~ 50%), and the production efficiency is low. In addition, due to the cutting process, the metal fibers will be cut off and exposed, resulting in the wear resistance of gear tooth surface Poor mechanical properties such as strength and corrosion resistance. Gear precision forging technology can overcome the shortcomings of cutting technology. As a new process and technology with great development prospects, it has attracted more and more attention, and has become an important research topic in the field of metal plastic forming.
The so-called gear precision forging technology refers to the use of precision forging technology to make the plastic deformation of metal blanks to obtain gears that meet the requirements. It belongs to the category of precision plastic forming. The obtained gears can be used as finished gears directly or after a small amount of finish machining. Compared with traditional gear processing technology, gear precision forging technology has the advantages of high productivity, low material and energy consumption, good mechanical properties and long service life.