Traditional machining center BFN machining center tool: 14 tools; 4 tools (one probe is needed) 1. Ø52 rough boring; 1. Ø42～Ø68 and rough machining; 2.Ø52 semi-finishing boring; 2.Ø42～ Ø68 Finishing; 3.Ø52 Fine Boring; 3.Ø98 Finishing; 4.Ø68 Rough; 4. Finishing of Each End Face: 5.Ø68 Semi-Fine Finishing 6.Ø68 Fine Finishing 7.Ø98 Outer Round and End Face Thick and Half Finishing; 8.Ø98 Round fine boring; 9.Ø42 rough boring; 1O.Ø42 semi-finished boring; 11.Ø42 fine boring; 12.Ø64 rough boring; 13.Ø64 semi-finished boring; 14. Ø64 fine boring. Only this example shows that the BFN compound machining center greatly reduced the number of tools and the auxiliary time, reflecting the characteristics of its composite processing. 
Processing example
Application of U-axis horizontal machining center
1 Introduction In the development of horizontal machining centers, ordinary X, Y, and Z axes with spindles have been difficult to meet the requirements of modern machining. For the requirements of multi-functional and composite machining, people have developed B, W, and U axes. And the axis linkage to achieve composite processing. The author now only discusses the application of shaft machining. In hydro-pneumatics, construction machinery, petrochemical equipment, automobiles, rolling stock, and power equipment industries, the axle housing, differential housing body, and valve body type parts are the main processing targets. In the use of horizontal machining centers for such parts, due to their own structural characteristics and special requirements for the processing methods, there are mainly the following problems: First, such parts have a large number of coaxial boreholes with different inner diameters and are coaxial. Secondly, some pump bodies and valve bodies require very high sealing performance; in addition, due to various other reasons, the processing of such parts often depends on special planes. In order to solve these contradictions, tool makers have introduced U-axis tools. Such tools are equipped with a CNC control unit connected to the machine's servo system (the technical agreement needs to be discussed with the machine manufacturer in advance), and a connecting shaft is provided to complete the drive. In order to achieve U-axis and Z-axis linkage, you can complete the taper hole, R surface, thread and other processing. The optional probe can be used for automatic measurement, automatic processing, and improved machining accuracy. This method can meet the requirements for adding a U-axis function to an ordinary horizontal machining center. However, during actual use. The tools with U axis function have the following deficiencies: (1) The connection and installation of the servo unit and the drive unit of the tool have special requirements for the system function and mechanical structure space of the machine tool; (2) The structure of the tool itself is relatively thin and does not apply to Heavy-duty cutting; (3) For machining with a large difference in aperture or processing content, it is still necessary to use a plurality of tools with U-axis function. Since this is a special tool, the price is relatively expensive, so it is not economical. 2 Horizontal machining center with U-axis The BFN series of compound horizontal machining centers developed and produced by Nigata Corporation (NIGATA) in Japan gives a new concept to the traditional horizontal machining center. Its U-axis function not only solves the problem of the above-mentioned special-shaped parts. Machining problems at the same time greatly reduce the number of tools used for general machining and increase tool integration. Its main features are: The U-axis unit is directly mounted on the end of the high-rigidity spindle. The drive unit is realized through the gear and rack drive inside the spindle, which greatly improves the rigidity of the U-axis. The U-axis travel is 50mm, and the maximum diameter of the bore can be reached. 300mm; 1/10 short shank, double-end shank for end face, suitable for high-precision heavy-duty cutting; unique U-axis cooling system, synchronous rotation with U-axis to enhance blade cooling effect; with special programming Auxiliary software (SNAP3) simplifies and optimizes programming and program debugging. Another automatic detection and compensation system is used as a selection function (in-machine non-tool change type) to automatically perform “roughing→aperture automatic measurement→U axis automatic compensation→finishing "The whole process. Presenting a simple example (see figure) to compare the machining process of the BFN compound machining center with the traditional machining center: