Recently, Shanxi Provincial Department of Science and Technology and Datong Municipal Bureau of Science and Technology organized an expert acceptance of the Shanxi Province Science and Technology Innovation Project “ Sino Heavy Industry Commercial Vehicle Automatic Transmission (AMT) Development†undertaken by China National Heavy Duty Truck Corporation, and the participating experts heard the project report. After reviewing relevant materials, they passed the acceptance after questioning and discussion. This project achieved the independent development of heavy-duty commercial vehicle automatic transmissions (AMT), key technologies such as intelligent shift regulations, complete and thorough implementation of V-cycle development process, AMT industrialization, clutch actuators, matching and calibration technologies, etc. A breakthrough was achieved. The first round of prototype production of the project has been completed. At present, the second round of prototype rig test and preliminary reliability test are in progress. The project has applied for 9 patents, including 3 invention patents and 6 utility model patents. It has authorized 3 utility model patents.
According to the classification of forging process, closed die forging and open die forging are commonly used. Closed die forging generally keeps the gap between the upper die and the lower die during the forging process, and the material is formed in the closed die cavity around it. Generally, no flash is generated. A small amount of excess material will form longitudinal flying spurs, and the flying spurs can be removed in subsequent steps. Closed die forging improves the dimensional accuracy and surface quality of the product, reduces flash, and improves the utilization of materials.
SCZY mainly produces hot forging products, both closed die forging and open die forging are produced, which can depend on the requirements of the product. Whether it is closed die forging or open die forging, we will fully consider it during mold development to reduce the occurrence of defective products in the production process. Our own internal mold manufacturing, forging production and subsequent secondary CNC machining can cooperate with each other, which can better ensure product quality and production delivery.
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China National Heavy Duty Truck AMT Transmission 
Achieve self-development of China National Heavy Duty Truck Big Tooth AMT project through acceptance