The structure of five-axis linkage CNC machining center

      Most of the five-axis linkage machining centers have a 3+2 structure, that is, the three linear motion axes of x, y, and z process two of the three rotations of a, b, and c that rotate around the x, y, and z axes respectively. . In this way, from a large perspective, there are ×, y, z, a , b; x, y, z, a , C ; three forms of x, y, z, b, c; a group consisting of two rotation axes In terms of form, there are generally three forms: double turntable, turntable plus swing head type.

      Due to physical reasons, these three structural forms determine the size of the machine tool and the range of processing objects respectively. Among them, the five-axis linkage machine tool with double turntable structure is only suitable for processing small parts such as small integral turbines, impellers, small precision molds, etc. because the workpiece needs to move in two directions of rotation. Because of the simplest structure, the relative price is relatively low. , In terms of application, this is the largest number of five-axis CNC machine tools.

      The five-axis linkage machine tool with the swing head structure on the turntable is processed because the turntable can be a-axis, b-axis or c-axis, and the swing head is the same, which can be a-axis, b-axis or c-axis respectively, so the swing-head structure on the turntable is The five-axis linkage machine tool can have various combinations to adapt to different processing objects. For example, when processing the blades of a steam turbine generator, the a-axis is required to process the b-axis, and the tip of the tailstock needs to be used to support the workpiece. If the workpiece is long At the same time, if the diameter is small, it is necessary to clamp and stretch the workpiece at both ends for processing. Of course, a necessary condition here is that the two turntables must rotate strictly synchronously. Using the c-axis plus the b-axis, since the workpiece only rotates on the c-axis, the workpiece can be small or large, and the diameter can range from tens of millimeters to thousands of meters, and the diameter of the c-axis turntable can also be from 100- 200mm to 2-3m, the specifications and quality of the machine tools range from a few tons to a dozen or even dozens of tons.

       This is also a type of five-axis linkage CNC machine tool that is widely used. The price is in the middle, and the size of the machine varies greatly in accuracy and performance. The five-axis linkage machine tool with double swing head structure, due to the structure itself, generally has an electric spindle with a loose broach structure in the middle of the swing head, so the double swing head itself is not easy to make small, generally 400-500mm.