The fan channel of the large bypass ratio turbofan engine has basically reached more than 500mm in length. This large-scale structural feature makes the centrifugal force and vibration stress in the work very large, so it also becomes a large turbofan engine. A very important part. At present, many turbofan engines still use the relatively mature titanium alloy damper fan blades. The narrow profile of the blade profile makes the weak rigidity of the thin-walled structure in the basin back direction more prominent. The poor rigidity of the structure and the large overall area of ​​the profile and the difficult processing of the material have adversely affected the processing by the conventional machining process. The visual representation is the contour dimensional accuracy and positional accuracy of the profile. The difficulty is guaranteed, the manual polishing efficiency is low, the labor intensity is large, and the leaf type is prone to burns and ablation. The existence of the above problems constitutes a bottleneck in blade production. With the development and application of multi-axis linkage CNC machining technology and the research on the blade profile processing technology, the difficulty of the blade profile processing has been gradually broken, and the quality and efficiency of the machining have reached an ideal state.
Main process route for large-scale titanium alloy fan blade profile CNC machining
For the processing of large titanium alloy fan blade profiles, considering the various factors involved in the traditional process, the adverse effects of the following aspects are as follows.
1 Influence of materials
(1) The elastic modulus of titanium alloy is small, which is easy to cause the clamping deformation of the blade processing; the wear of the flank surface during processing is prone to increase the cutting force.
(2) Poor thermal conductivity, dry grinding by hand polishing is easy to cause stress deformation, burn and ablation.
2 Influence of blade structure
(1) The overall processing area of ​​the profile is large, and the precision caused by the wear during tool processing is greatly affected.
(2) Manual polishing is inconvenient to handle, labor intensity is large, and processing accuracy is difficult to guarantee.
3 wool condition impact
Due to the influence of the material and the size of the specification, it is difficult to obtain an ideal balance distribution, thereby causing fluctuations in the cutting force caused by uneven removal of the profile margin, resulting in stress deformation.
4 Machine function impact
(1) The curved surface structure of the blade profile, the cutting direction of the tool, the actual cutting angle and the cutting parameters cause the change of the cutting force.
(2) The cooling conditions are poor, and the thermal stress is deformed due to insufficient cooling and no cooling.
Aiming at the difficult factors of large-scale titanium alloy fan blade profile processing, according to the comprehensive processing advantages of multi-axis linkage CNC machining technology, the main processing route determined is: blade boring and auxiliary positioning reference processing → blade profile NC rough milling Processing → stress relief annealing → positioning reference repair → blade profile CNC finishing milling → profile finishing. The overall process idea established by the above process route is: the face surface CNC rough milling process removes most of the margin and makes the finish milling process have an ideal margin distribution; the blade profile CNC finishing process ensures the geometry of the profile And the positional accuracy basically reaches the final precision requirement of the blade; the light finishing of the blade profile ensures that the surface layer quality of the profile meets the requirements.
| Previous page | 1 | 2 | 3 | Next page |
Brass fasteners are used for their physical and aesthetic properties. Brass is utilized due to its high thermal conductivity and corrosion resistant properties, it is suitable for use in hot and cold environments, and resistant to water corrosion, making it a staple of industries such as heating and plumbing. Brass fasteners are largely non-magnetic (like any fastener, slight magnetic properties can develop during the manufacturing process) and resistant to tarnishing.
Brass fasteners are suited for some marine environments, including brackish water and slow current sea water; brass in this environment develops a protective green coating. Brass fasteners are also commonly used with wood applications, as the golden coloring blends well with the tan wood. Brass is a softer metal and must be used with care, always drilling pilot holes and using driver bits that fit the head of the screw precisely to prevent stripping. Brass Bolts also require a pilot hole be driven before installtion.
Brass Nut,Adjustable Brass Nut,Brass Strat Nut,Brass Cap Nut
Taizhou Hongchuang Hardware Co., Ltd. , https://www.taizhouhongchuang.com