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Figure 1 Spiral cutter shaft 
Figure 2 FRP cylinder, top view elliptical structure 
Figure 3 8m × 20m CNC milling machine composite machine tool
North Heavy Industry Group Co., Ltd. is a wholly state-owned company established on the basis of the merger and reorganization of Shenyang Heavy Machinery Group Co., Ltd. and Shenyang Mining Machinery (Group) Co., Ltd. After acquiring the French NFM company in 2007, it became a multinational business. North Heavy Industry now has four industrial parks, namely Shenyang R&D and Manufacturing Industrial Park, Shenyang Casting and Forging Industrial Park, Yingkou Lingang Research Base and France Lyon Research Center, covering an area of ​​1.6 million m 2 and a total of more than 10,000 employees.
1. Main products and processing characteristics
The main products of the North Heavy Industry include tunnel engineering equipment, power equipment, building materials and equipment, metallurgical equipment, mining equipment, coal machinery, petroleum fracturing equipment, port equipment, environmental protection equipment, forging equipment, transmission machinery, automotive electrical appliances and large castings and engineering general contracting project. The characteristics of the machined parts are characterized by large overweight and super high, overhanging and long structure and complex structure.
Processing case 1: The spiral surface of the cutter shaft is a complex curved surface with high manufacturing precision. The 54mm size groove is machined on the outer surface of φ 348mm and the helix angle is 2°25′. It must be consistent with the relevant parts. The process is 25 903.548 57mm and the length is 2 100mm, and it is required to be opposite to the spiral of the related parts. As shown in Fig. 1, it is ensured that the corresponding portion of the spiral groove after processing is symmetrical with respect to the line of symmetry. For the machining of such spiral curved surfaces, special auxiliary equipment is required in the case of no five-axis simultaneous machining, and the accuracy of the curved surface cannot be guaranteed, and the processing of the holes vertically positioned along the spiral space is even more impossible.
Processing Case 2: As shown in Figure 2, the FRP cylinder is an elliptical curved surface, which is difficult to mill. The long side of the ellipse is 3 500 mm, the short side is 1 600 mm, the overall height is 2 330 mm, and there are two bosses in the middle. There is a round R40mm and R20mm transition, the thinnest part of the workpiece has a thickness of 15mm, and the machining accuracy of the outer surface of the workpiece is required to be Ra=6.3μm, and the end faces of both ends reach Ra=12.5μm. It is necessary to carry out one adjustment during the processing, which cannot be guaranteed. Machining accuracy, ordinary machine tool processing is difficult and difficult to measure, such workpieces are easier to implement using five-axis machining, and program detection is more convenient.
2. Five-axis machine tool main parameters
CNC 8m×20m milling and turning machine tool, produced by German Heath Company, movable beam and gantry mobile structure can process large tonnage workpieces, which can bear more weight than mobile worktables, can meet the one-stop machining of workpieces, and the precision is guaranteed.
The fixed height of the machine tool is 6 000mm × 15 000mm, the maximum width of the workpiece is 7 000mm, the maximum length of the workpiece is 19 000mm, the maximum height of the workpiece is 5,000mm, and the Z-axis stroke is 3 000mm. The W-axis travel is 4 000 mm, the C-axis rotation range is ±270°, and the A-axis rotation range is ±95°.
CNC system: Siemens 840D.
3. Existing problems and prospects
Our company's existing VMG6 seven-axis five-link CNC machine tool A-axis and C-axis can not realize the tool length compensation and radius compensation function, to ensure that the spiral cutter shaft has a pair of rotation direction symmetric spiral groove and space spiral positioning The positional relationship of the holes requires external calculation of the tool compensation parameters, and the calculation process is complicated. FRP cylinders are also not capable of radius compensation.
Through the spatial three-dimensional model established by the software, the simulated motion trajectory of X, Y, Z, A and C axes which are suitable for our company's machine tools is designed, and the tools used for machining the spiral cutter shaft and the FRP cylinder are processed by external software. The length and radius compensation are calculated, and finally a five-axis linkage NC program that can be processed in our machine tool is formed. The realization of five-axis linkage machining of spiral cutter shaft and FRP cylinder has laid a solid foundation for the processing of large and medium-sized parts of complex curved surfaces, which has improved our production and processing capabilities.
Five-axis linkage machining is the most advanced single-channel maximum linkage CNC machining technology in the world. It can be applied to the processing of various complex curved surfaces. It has a wide range of applications and the problem of tool compensation needs to be improved.