Machine Tool Manufacturing Jointly Develops with Rail Transit

China’s rail transit began with the first major acceleration in the late 1990s after the reform and opening up, and by the eighth acceleration in 2011, China’s rail transit experienced a rapid development process. The realization of these high speeds cannot be separated from advanced technologies. Manufacturing technology and equipment. At present, Chinese companies, after introducing advanced machine tools and tools, combine the special products of rail transit with a long process of digestion, absorption and consolidation. Especially for process programming, operators, and even production management personnel, there is a gradual process from unfamiliarity to preliminary grasp to ease of application.

China's rail transit began with the first major acceleration in the late 1990s after the reform and opening up, and by the eighth acceleration in 2011, China's rail transit experienced a rapid development. Take Shanghai to Nanjing as an example. Before the speed increase, it takes 4 to 5 hours. The fastest time is only 1 hour, and the speed has exceeded 350 kilometers per hour. It takes only 5 hours from Shanghai to Beijing. And these high-speed realizations are inseparable from advanced manufacturing technologies and equipment.

In relation to rail transit machine processing, the main components that are relatively difficult to machine are the bogie sections of bogies and air-core axle bushes, and the key components of diesel engines. Locomotive diesel engine main parts have complex structure, manufacturing precision, shape and position tolerances and surface roughness requirements (the accuracy index is mostly in the 5 to 7 grade, roughness Ra0.4 or so), requiring good interchangeability, such as the body, the crankshaft The main purpose of the connecting rod and cylinder head is to ensure that the locomotive has good reliability, high durability and high safety factor in high-speed operation.

In terms of diesel engine key components, the relative dimensional accuracy of many components is in the μm class, which was previously unimaginable and cannot be achieved at all.

"Machining is made up of basic machining methods such as car, milling, planing, boring, drilling, and grinding." Around different products and different processing processes of the same product, in the past, people used a large number of traditional processing lathes with a single processing function. , Milling machines, planers, boring machines, drilling machines, grinding machines and other general equipment, with the development of technology, the proportion of these common equipment has been greatly reduced, replaced by single-axis and two-axis linkage processing of CNC lathes, vertical And horizontal machining center CNC machining machine tools.

With the development of random bed accessories and in-depth research on related technologies, today's CNC machine tools have been dominated by flexible, compound, multi-axis linkage, high precision, and high speed. Such as multi-axis milling and milling center, boring and milling center, follow-type grinder and so on. The performance of the machine tool also features high-speed, high-efficiency machining and intelligence along with the development of tool materials and manufacturing technology, computer software technology, precision measurement technology, and rapid servo drag technology. In addition, in order to meet the user's demand for product production, various types of machine tools with mixed functions and mashup technologies are also produced. Such as: laser and milling (DMG) knead together; milling and grinding (Wollenberg) knead together and so on. Taking the crankshaft as an example, a turning and milling center has replaced machining functions such as car, milling, drilling, expanding, and reaming that could be achieved by 6-7 machines in the past, including all machining of the crankshaft, connecting rod neck, and crank. ,Flange hole processing, keyway processing, thread hole processing, main oil hole and oblique oil hole processing, etc., reduce the number of clamping, improve product accuracy, and at the same time greatly reduce the preparation of trial equipment for new products, machine tools The processing flexibility is greatly enhanced; similarly, a crankshaft follower grinder replaces the original ordinary large-scale cylindrical grinder and the connecting rod-neck crankshaft grinder. One device has the effect of two grinders, and the floor space is only one. grinder.

In addition, CNC online measurement also solves the measurement problems in previous machining. MarpossFENAR-L online diameter measuring device can control the precision of online product processing in real time and set the automatic alarm beyond.

At present, Chinese companies, after introducing advanced machine tools and tools, combine the special products of rail transit with a long process of digestion, absorption and consolidation. Especially for process programming, operators, and even production management personnel, there is a gradual process from unfamiliarity to preliminary grasp to ease of application. Therefore, how to be a good company's technologist to help companies put their equipment and tools into use as quickly as possible and generate benefits quickly - this, in turn, sets a good image for their products. This is a new topic for equipment manufacturers. At the same time, how to quickly master advanced equipment technologies is also a lasting issue faced by Chinese and corporate customers.

The future development of rail transit manufacturing will continue to grow with the development of random bed manufacturing; it will continue to evolve with the different needs of all industries. Green and diversified (to meet the requirements of different users), low noise, low pollution, low fuel consumption, low emissions (to meet Tier IV emission requirements) and high reliability are also targets for the design and manufacture of diesel locomotives. CSR Qishuyan Locomotive Co., Ltd. plans to continue efforts in this direction through international cooperation.