Five-axis linkage machining centers have high efficiency and high precision, the workpiece can be clamped once to complete the processing of five faces. If with five-axis linkage of high-grade CNC system, can also be complex space surface for high-precision machining, more able to adapt to the automotive parts, aircraft structural parts and other modern mold processing. Vertical five-axis machining center rotary axis there are two ways, one is the table rotary axis, set in the bed of the table can rotate around the X-axis, defined as the A-axis, the A-axis general working range of +30 degrees to -120 degrees. There is also a rotary table in the center of the table, rotating around the Z-axis at the position shown in the figure, defined as the C-axis, which are all 360-degree rotary. In this way, through the combination of A-axis and C-axis, the workpiece fixed on the table in addition to the bottom surface of
Five-axis linkage machining center
Except for the rest of the five surfaces can be machined by the vertical spindle.A-axis and C-axis minimum indexing value of 0.001 degrees, which in turn can be subdivided into any angle of the workpiece, machining of tilted surfaces, tilted holes, etc. The A-axis and C-axis, such as the three linear axes of XYZ linkage, it can be used to achieve a more efficient machining. A-axis and C-axis with XYZ three linear axes to realize the linkage, can be processed out of the complex spatial surface, of course, this requires high-grade CNC system, servo system and software support. The advantage of this setup is that the structure of the spindle is relatively simple, the rigidity of the spindle is very good, and the manufacturing cost is relatively low. However, the general worktable can not be designed too large, load-bearing is also smaller, especially when the A-axis rotary greater than or equal to 90 degrees, the workpiece cutting will bring a lot of load-bearing moment on the worktable. Another is to rely on the vertical spindle head rotation. The front of the spindle is a rotary head, can surround the Z-axis 360 degrees by itself, becoming the C-axis, rotary head with a rotary head can be rotated around the X-axis of the A-axis, generally up to ± 90 degrees or more, to achieve the same function described above. The advantage of this setup is that the spindle machining is very flexible and the table can be designed to be very large, so that the huge fuselage of an airliner and the huge engine case can be machined on this type of machining center. This design also has a major advantage: we use a spherical milling cutter processing surface, when the tool centerline perpendicular to the machining surface, due to the apex of the spherical milling cutter line speed is zero, the apex of the workpiece surface quality will be cut out very poorly, using the spindle rotary design, so that the spindle relative to the workpiece to turn an angle, so that the spherical milling cutter to avoid the apex of the cut to ensure that there is a certain line speed, can improve the surface processing quality. This structure is very welcome by the mold high-precision surface processing, which is difficult to do with the table rotary machining centers. In order to achieve high precision rotary, high-grade rotary axis is also configured with a round scale feedback, indexing accuracy are within a few seconds, of course, this type of spindle rotary structure is more complex, manufacturing costs are also higher.