xiehe model

The most difficult part in the processing of compressor impellers is the closed impeller. The closed impeller consists of a wheel cover, a hub and blades, and its shape, structure and processing technology are extremely complex. Below, the editor will introduce to you the difficulties in processing compressor impellers when ordering.

Compressor impeller machining must not only ensure the geometric shape requirements, but also ensure the blade surface quality requirements. The space between adjacent blades and between the blades and the wheel cover is small, the impeller cavity is too deep, and it is difficult to remove chips. The cutter axis has many vector constraints and is easy to dry out.

Compressor impeller is a difficult material to process. The enclosed impeller is made of 15-5PH steel. Closed impellers generally work in high temperature and high pressure environments for a long time, so there are strict requirements for their materials. 15-5PH steel has the best comprehensive mechanical properties: yield strength Rp0.2530~625MPa, tensile strength Rm1050~1070MPa, impact value akv113~115J/cm. These parameters fully reflect the difficult-to-cut coefficient of the closed impeller.

Selection of cutting tools for difficult machining of compressor impeller. Due to the large size of the machined closed impeller and the deep cavity, the material is difficult to cut. Therefore, the choice of cutting tools is particularly important. The maximum length of the tool holder is 165 mm, and the extension length of the tool bar is 165 mm. The length of the tool holder plus tool shank is about 330 mm (diameter 20R1 tungsten steel anti-seismic tool shank). The finishing tool uses a lollipop ball cutter (diameter 14R7).