1, Limitations on processing capability
A three-axis milling machine mainly includes three linear axes, X, Y, and Z, which respectively control the movement of the tool in the horizontal and vertical directions. This design enables three-axis milling machines to perform well in machining simple shaped parts such as planes, slopes, and grooves. However, when faced with parts with complex surfaces or inclined features, three-axis milling machines become inadequate. For example, when machining spiral grooves, camshaft lobes, or parts containing a single XY plane external curvature, a three-axis milling machine cannot directly complete these features because they require the tool to move simultaneously in multiple directions.
2, The bottleneck of processing efficiency
When processing complex parts, three-axis milling machines often require multiple clamping and repositioning, which not only increases operational difficulty and time costs, but may also lead to a decrease in machining accuracy. Especially when processing parts with multiple side features, precise alignment and calibration are required for each clamping, which greatly reduces processing efficiency. In contrast, multi axis milling machines can achieve polyhedral machining with one clamping by increasing the rotation axis, thereby significantly improving machining efficiency.
3, The challenge of machining accuracy
When a three-axis milling machine is used to machine curved surfaces, especially when using ball end mills, there is a point where the cutting speed is zero, which is the point where the tool vertex contacts the workpiece. These zero cutting speed points will result in poor bottom surface finish, affecting machining quality. In addition, due to the relatively fixed machining path of three-axis milling machines, it is difficult to flexibly adjust according to the shape and characteristics of the workpiece. Therefore, it is difficult to ensure high-precision machining results when machining certain special shaped parts.
4, Limitations of application scope
With the continuous development of manufacturing industry, the complexity and diversity of product structure are increasing day by day. Due to its limited machining capacity, three-axis milling machines are unable to meet all types of machining needs. Especially in high-end manufacturing fields such as aerospace, automotive manufacturing, and mold manufacturing, there are extremely high requirements for the accuracy, complexity, and processing efficiency of parts, and three-axis milling machines often cannot meet these requirements. In contrast, multi axis milling machines have been widely used in these fields due to their powerful machining capabilities and flexibility.
5, Requirements for operation and maintenance
Although the structure of a three-axis milling machine is relatively simple, its operation and maintenance also require certain professional skills and experience. During the machining process, operators need to select appropriate tools and machining parameters based on the shape and characteristics of the workpiece to ensure machining quality and efficiency. Meanwhile, regular maintenance and upkeep of the equipment are also essential. However, due to the limited machining capacity of three-axis milling machines, the requirements for operation and maintenance personnel are relatively low, which to some extent limits the improvement of their machining accuracy and efficiency.
