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Five-axis machining with trunnion and planetary structures

Five-axis machining machines with trunnion and planetary structures usually add a two-axis rotary table to a standard three-axis machine tool. The advantage of this structure is that the parts are fixed on the center line of rotation. Depending on the size, when the rotary axis changes its angle during linked machining, the linear coordinate compensation stroke is the shortest. During this operation and at the end of each machining cycle, the feed is limited by the operating status of any one of the five coordinate axes. Usually the compensation stroke is too large and is limited by the linear axis. Due to its large weight and offset effects, it cannot effectively increase the acceleration of linear coordinates. In contrast, thanks to direct drive technology, high dynamics can easily be achieved with rotary coordinates. Combining this with short strokes helps shorten machining cycle times and improve machining accuracy.

Short compensation stroke usually has nothing to do with five-axis positioning. It only causes problems during high-speed machining, when linear coordinates and rotary coordinates are required to reach the target position almost simultaneously. As five-axis machining parts become more and more complex and require more types of tools, a large amount of tool change time will be generated during the machining cycle.

On the other hand, because the casting of the machined part is very close to the actual shape and the application of high-performance cutting technology, the cutting time is shortened. As shown in the figure, when processing aluminum automobile steering knuckles, an innovative five-axis machining concept is used, and the chip-to-chip time is only 1.9s. Since all tools only need to be changed once when processing two parts on the left and right sides, the tool change time is reduced by 50%.

Adopts more efficient loading and unloading technology. The standardized robot unit cooperates with the overall raw material and finished parts storage device to effectively reduce non-production time. In addition to loading and unloading materials for the two machines, the robot can also be responsible for cleaning, marking, measuring and other operations. Adjustment times between different machining applications are short thanks to the planetary table, which can be equipped with seamless clamping. Using high-speed direct drive, the two worktables can be mirrored for processing, which is very meaningful for the processing of symmetrical parts, such as processing symmetrical parts on the left and right sides of cars, trucks, or airplanes.

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