| There are a vast of large cylinder parts in the national key projects field of aerospace, which are composed of composite material cylinder and metal end-frame. The manufacturing quality of these parts directly affects the overall performance of equipment. The error terminal cumulative effect cannot be neglected because dimension errors of composite material cylinder after forming and metal end-frame after processing are relatively large. Generally, the butt assembly of large cylinder parts depends on repeated trial assembly and artificial experience, which results in low efficiency and low quality stability. Combining traditional butt assembly technology and modern online detection technology systematically becomes an effective way for butt assembly of large cylinder parts. This paper is supported by the project commissioned by China Academy of Launch Vehicle Technology. It focuses on the butt assembly problems of large cylinder and end-frame and studies the online detection methods and system of butt assembly.Aiming at the butt assembly problem of large cylinder and end-frame due to large size, low stiffness and significant error terminal cumulative effect, the deficiency of existing butt mode is analyzed and a novel precision butt assembly method based on process parameter online feedback is presented in this paper. A multi-parameters including circular run-out and butt assembly gap of cylinder and end-frame synchronous online measurement scheme is designed. Besides, Acquisition method and related technology of measurement information is studied, and calibration experiment of the image sensor is completed.To get higher assembly efficiency during the assembly process of large cylinder and end-frame, a novel posture calculation and adjustment method of butt assembly are proposed in this paper. Based on the measurement information of multi-parameters of butt assembly, a mathematical model is established to describe the posture of the large cylinder, which is used to calculate the adjustment parameters to realize the precise adjustment of the posture of the large cylinder during the assembly process.Based on "PC+ARM" structure form, an online detection system for butt assembly process is constructed. Online detection mechanism on the basis of the existing butt frock is designed to perform the measurement operation. With modularization method, function modules of online detection system for large cylinder and end-frame are programmed to realize real-time measurement data acquisition, wireless communications and mechanism motion control besides, multifunctional user interface of online detection system is designed with VB to realize interaction between human and computer.Finally, the developed online detection system actually is applied to the butt assembly process of certain large cylinder and end-frame to validate the accuracy and efficiency of the developed online detection method and system. |
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