The rapid development of China's wind power industry has led to a rapid increase in the domestic level of domestic wind power equipment, and has also driven the development of related industries in China. The main components of the wind turbine require a large number of special processing equipment such as precision and large CNC machine tools. Breakthroughs in wind power equipment manufacturing technology rely more or less on the advancement and precision of machine tools. It can be said that the advanced equipment manufacturing process, especially the advanced machine tool equipment, is the fundamental guarantee for the upgrading of the wind power equipment manufacturing industry.
For example, the gearbox of a wind power equipment is mainly composed of a box body, a planetary gear train and a shifting mechanism. The gearbox body is a large-sized box body, and its structure is complicated, and the manufacture of various components requires different machine tool equipment for processing. The megawatt-class wind power equipment gearbox has a diameter of about 2 to 3 meters depending on the amount of power generated, and most of them are separated structures. Machining requires a CNC floor-type milling and boring machine with a diameter of 160-250 mm, a large horizontal machining center and a gantry machining center. The machining accuracy is high. Large-size, large-modulus gears and ring gears need to be machined with CNC forming and milling machines and CNC forming gear grinding machines. Among them, CNC forming and milling machine requires large depth of cut, large feed and high rolling speed; CNC forming gear grinding machine requires precision of 5 or above, requiring automatic self-aligning, automatic measurement, automatic shaping and other high degree of automation and high stability. .
For the machining of large blades, CNC milling machines are required. These machines are large-scale light non-metal five-axis machining machines. Although the machining accuracy is not high and the power and torque are small, the cutting speed of the machine is very high. The cutting speed is high. 30 m / min or more. The machining of the rotor shaft of the motor requires a large-scale horizontal milling and milling machine. It is necessary to increase the milling and grinding functions on the basis of the traditional horizontal lathe to achieve one-time clamping. The stator manufacturing requires vertical turning and milling. The machining of machine tools, especially the stator undercut, requires milling and grinding functions on the basis of conventional vertical lathes. It also requires a single clamping process.
The main components of the yaw mechanism, such as large bearings with internal and external teeth, and the manufacture of pinion gears and shifting devices, also require some special machine tools that require higher requirements.
The main shaft, the wind wheel and the tower are large components, which are difficult to process and require high precision. Specially designed special processing equipment is required, and it has high speed, high efficiency, intelligence, flexibility, automatic conversion of CAD/CAM, automatic A number of advanced features such as detection, error compensation and automatic fault diagnosis.
For a long time, the above-mentioned processing equipment has basically relied on import solutions, resulting in an increase in the cost of manufacturing wind power equipment. With the continuous improvement of the industrialization level of wind power equipment, the proportion of localization has increased rapidly, which has promoted the rapid development of the wind power market and provided new opportunities for the development of the machine tool industry. In recent years, in response to the processing of wind power industry parts and components, China's machine tool industry is actively researching and developing some processing equipment with independent intellectual property rights. Its processing precision, efficiency and stability are comparable to imported equipment.
The XKD2755×570-2M CNC fixed beam double gantry moving boring and milling machine independently researched and developed by Wuhan Heavy Machine Tool Group Co., Ltd. passed the results appraisal organized by Wuhan Science and Technology Bureau, and believed that the precision assurance technology and long-stroke machine tool guide technology of the machine tool are internationally leading. status. Its processing efficiency is 4 to 6 times that of ordinary equipment, and it has a wide range of applications, especially for the processing of large-sized parts such as wind power gears.
Shandong Fain CNC Machinery Co., Ltd. is also actively entering the wind power industry. The company's "Fining high-power wind power generation equipment key components CNC complete processing equipment" won the Shandong provincial science and technology research project. The project is composed of the following three major equipments: S15 5.5 m rotary table double-axis CNC drilling machine for large bearing inner and outer ring machining for 360 degree rotation of the engine room; S16 horizontal CNC drilling machine for horizontal spindle machining; PD5050 gantry mobile large-scale plane drilling and milling machine with large flange processing on the tower.
The VTM180 gantry type turning and milling compound machining center developed by Qinchuan Group is a high-precision, medium- and heavy-duty compound processing machine tool, which can be equipped with a universal swing milling head (B-axis) to realize seven-axis five-link linkage. Through the one-time clamping of the workpiece, the turning function of the large vertical car can be completed, and the milling function of the large pentahedron gantry milling can be completed.
The "2MW Wind Turbine Spindle Key Technology Research and Development" project completed by China North Industries Heavy Industry Co., Ltd. has passed the appraisal, and the self-developed 2MW wind power spindle machining tooling fixture has ensured the high precision requirements of the 2MW spindle.
Some senior experts in the wind power equipment industry and the machine tool industry agree that with the healthy and orderly development of the wind power industry, the demand for machine tools will have both a qualitative and quantitative improvement, and will further promote the product structure of the Chinese machine tool industry.
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