Design And Analysis For Multi-DOF Assembly Device Of Aero-engine

In this paper, according to the requirement that make adjustments to its stance when the aero-engine is assembled, so that the operators can able to complete the assembly and decomposition work by standing on the ground without the aid of ladders,we designed a multi-DOF aero-engine assembly device which can able to achieve multi-DOF motion. This assembly device has more freedom of movement and adjustable clamping mechanism, and is a relatively high degree automation, which belongs to electromechanical integration equipment. The adjustable clamping mechanism which is designed to connected to the engine, can able to achieve standardization and modularity, and can be quickly converted, so that the assembly device can able to suit for a variety of aero-engines main unit body and machine assembly, can enables the aero-engine assembly process and operate more safely and efficiently, can solve the problems that intensity and low efficiency in aero-engine assembly and maintenance work.In accordance with the technical requirements of the assembly device, raised the overall structure of the program, and by means of comparing several drive modes,finally chose AC servo motor as driving force source. According to the mechanical characteristics of structure, respectively designed three-dimensional vertical lift mechanism, three-dimensional pitching rotation mechanism, and the three-dimensional axis of rotation mechanism.According to the actual job requirements, determined the specific dimensions, as well as the outsourcing of component selection,.Completed the design and the whole structure virtual prototype assembly. On the vertical lift mechanism, for the purpose that to achieve vertical lift action, AC servo motors provide power to drive ball screw, and linear guide as a linear unit; on the pitching rotation mechanism, for the purpose that to achieve the elevation rotary motion, AC servo motor bilaterally symmetrical layout, via the drive gear drive slewing ring;on the axis of the rotation mechanism, for the purpose that to achieve the axis of rotation movements, the drive gear is driven by AC servo motor to drive rotating C-ring, and arc guide as arc moving element.Vertical lifting mechanism, pitching rotation mechanism,and the axis of rotation mechanism key structure finite element model were respectively established.Added constraints for each model according to the actual situation, as well as remote load meshing, and used finite element analysis software Simulation to do the structural static analysis. Finite element analysis results show that in the case of the three times rated load, the main structural member maximum stress value is less than the yield strength of the selected material, so that we can ensure the security and stability during the process of mechanism motion.In accordance with the practical application,we put forward the "control panel+PLC+servo motor" control mode,and completed of the selection of the control member. For the actual functional needs, the control program has three special design:movements are slow play slow stop; pitching rotation comprise a continuous mode and a key 90°in stand-alone mode; mechanical lock limit institutions and auxiliary relay program combine action to control pitching rotation.Multi-DOF assembly device as universal tooling equipment, was developed firstly in China. To verify whether it has practical effect and meet the functional requirements, while the first prototype manufacturing, designed and manufactured the weight load device for load simulation tests. On the condition of the rated load and the twice rated load,we done the performance testing and structural strength testing, and the test results reached the expected requirements, and verified the rationality of assembly device structural and control programming design. All things we done has important reference value for the optimization of the subsequent assembly device.