Digital Precision Assembly Technology of Piston Accumulator Sealing Pair

In this paper, a digital precision assembly method is proposed to solve the problem that the assembly quality of piston accumulator sealing pair is not controllable. To solve this problem, the assembly-force prediction model of the sealing structures was established, and a finite element nonlinear simulation method was adopted to simulate the assembly process of the sealing pair. The influence of friction coefficient, tolerances and other factors on the assembly-force was analyzed by combining simulation and practical application, and the envelope range of the assembly-force curves of the X-shape sealing ring and the polytetrafluoroethylene (PTFE) retaining ring was obtained under various influencing factors. By comparing the quantified assembly-force collected in the actual assembly process of automated press-fitting equipment and the envelope range, the assembly quality of the sealing structure in the assembly process can be judged in real-time.