As a key component of turbomachinery, monolithic impellers are widely used in aerospace and other fields, and their processing technology has always been an important issue in turbine manufacturing. It can be seen from the geometry and process of the integrated impeller that the machining of the integral impeller elbow has many constraints on the processing trajectory planning, and the space between adjacent blades is small. It is easy to generate collision interference during machining, and automatically generates no Interferometric machining trajectories are more difficult. Therefore, in the process of machining the impeller, not only the machining trajectory of the blade surface but also the geometric accuracy requirements must be ensured, and due to the limitation of the blade thickness, the trajectory planning should be paid attention to in the actual machining to ensure the quality of the daily work.
The DELCAM company's PowerMILL software has been used for many years in the aerospace industry's five-axis machining. Its technology and service are mature. It is widely used in aerospace, automotive, shipbuilding, and its powerful and easy-to-operate features. Internal combustion engines, household appliances, light industrial products and other industries.
Advantages of five-axis machining
The main advantage of the five-axis machining is that it can complete the entire machining of complex parts with only one clamping position, which can save a lot of processing time. When PowerMILL is positioned for 5-axis machining, the spindle is fixed in a series of directions for machining. In addition, PowerMILL offers continuous five-axis machining that allows multiple machining strategies and a full range of cutting tools to create a continuous five-axis tool path on complex surface, solid and triangular models, and all tool paths are overcut Inspection and machine simulation to ensure the safety of personnel and equipment.
Figure 1 Golf seed type advance and retreat knife process
Five-axis machining is an important embodiment of high-tech machining. In today's rapid development of software technology, machine tool technology and tool technology, with the sharp drop in equipment prices, five-axis technology has gradually entered the enterprise. PowcrMILI's new automatic collision avoidance function makes the automatic five-axis programming a reality. With this function, PowerMILL can automatically adjust the tool axis according to the collision gap set by the programmer, and automatically avoid the tool axis in the part where the three-axis machining is not possible. The three-axis non-collision area automatically restores the three-axis machining state, which ensures that the machining is performed with the shortest possible tool, which not only improves the rigidity of the machining but also increases the machining range.
Application of PowerMILL in Impeller Processing
At present, there is great progress in the manufacture of impellers at home and abroad. Most of the domestic impeller manufacturers have a certain gap in terms of complex impeller manufacturing technology compared with foreign countries. In this paper, we use PowerMILL7.0 to explain the force II trajectory planning of the impeller. The basic machining process is based on the geometric characteristics of the impeller and the requirements of use. The specific contents include:
1 Prepare the blank
The material is forged aluminum, which is turned into the basic shape of the rotary body, which can reduce the time of CNC machining.
2 tools
From roughing to final finishing, ball knives or taper ball knives of different specifications are used. In this example, R6, R3 ball knives and R2 full cone 3° taper ball milling cutters are used.
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