China's rail transit began from the first large speed increase in the late 1990s after the reform and opening up, and the eighth speed increase completed in 2011. The medium-orbit traffic has experienced an expanse of history. Take Shanghai to Nanjing as an example. The whole journey takes 4~5 hours before the speed increase. The fastest one is only 1 hour, and the speed has exceeded 350 kilometers per hour. It takes only 5 hours from Shanghai to Beijing. In 2012, the famous German consulting organization SCI Verkehr released a research report and announced the top ten new worlds of rail transit equipment manufacturers in 2010. China South Locomotive ranked first in the world. CSR Qishuyan Locomotive Co., Ltd. is a modern large-scale enterprise that produces trunk railway diesel locomotives as its main products. The main models are Dongfeng 8, Dongfeng 8B, Dongfeng 11, Dongfeng 11G, HXN5 and other series of diesel locomotives. The locomotives of the first six speed-ups of China Railway are mainly DF11G diesel locomotives based on CSR. In the past two years, the speed of railways has been dominated by electric locomotives. However, diesel locomotives still have an irreplaceable position, especially in terms of speeding freight locomotives. From the overall situation, the demand for diesel locomotives is still quite large. There are currently more than 19,000 full-duty diesel locomotives. In addition, high-power shunting locomotives are currently in short supply in various locomotive sections and large enterprises such as coal mines and oil. According to preliminary estimates, the total number of locomotives updated each year is more than 600 (no Including about several thousand repair locomotives per year).
The difficulty of processing the main parts of rail transit is related to the processing of rail transit. Relatively speaking, the main components with difficulty in machining are the bogies such as car body bogies and air core bushings, and the key components of diesel engines. The main components of the locomotive diesel engine are complex in structure, high in manufacturing precision, shape tolerance and surface roughness (the accuracy index is mostly in the 5~7 grade and the roughness Ra0.4). It requires good interchangeability, such as the body and crankshaft. The main purpose of the connecting rod, cylinder head, etc. is to ensure the high reliability, high durability and high safety factor of the locomotive in high-speed operation. In terms of the key components of diesel engines, the dimensional accuracy of many components is in the μm class, which was previously unimaginable and could not be done at all.
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