Tractor transmission system is the core component of tractor, which determines the performance of the whole machine, reflects the manufacturing process level of manufacturers, and restricts the cost and profit space of the whole machine. Its production covers traditional forming processes such as casting, forging, welding and powder metallurgy, as well as modern precision forming technology. The manufacturing technology of tractor parts is almost concentrated on the production and manufacturing of transmission system (transmission parts). However, at present, due to product performance, accuracy, batch, price and early investment, in the manufacturing technology of transmission system, in addition to the purchased professional and socialized parts (standard parts, rim, steering, etc.), the large domestic tractor parts manufacturers, Basically, no precision forming technology is adopted.
Combined with the development trend of the above tractor parts, the application prospects of the above two precision forming technologies (dieless casting and precision forging) are briefly analyzed and prospected.
1) The development needs of special tractor parts. Whether it is orchard type, horticultural type, forest farm type or customized tractor parts, the existing frameless (transmission box is directly used as the frame) box should be cast in a single small batch. Dieless casting is undoubtedly the most appropriate manufacturing technology.
2) The need of high-power development. The development of High-power Tractor parts first puts forward quality requirements for the performance of transmission parts. Secondly, it is basically a small batch product. Precision forging has high transmission power ratio and performance. At the same time, dieless casting is also the first choice for its box casting.
3) Parts serialization requirements. One of the characteristics of precision forging is that it has good advantages of serialization and specialization, which can not only reduce the cost, but also ensure the product quality.
4) Man machine environment development needs. Firstly, precision forming is easy to realize the lightweight of products. Secondly, such as synchronizer, power shift clutch hub, planetary gear train, etc., the application of precision forging in such parts has an absolute price advantage.
As an advanced manufacturing technology, precision forming technology has been widely used in the manufacturing of automobile parts. According to the data, the total mass of a car is about 1200 kg, including tires, glass, seats, interior trim, water tank, oil, etc. It is preliminarily estimated that the metal precision forming parts are nearly 200 kg, including precision punching and precision casting parts such as covering parts and aluminum alloy gearbox shell, and most of the gears and shafts are precision forgings, about 56 kg. As tractor parts belonging to power machinery, the application of precision forming technology in it lags far behind that of automobiles. With its development and the demand of product performance, it is believed that its application in tractor parts will be fully launched in the next few years.