关键词: 阀芯, 再制造, 几何重构, 加工路径, 位姿, 性能

Abstract:  In order to achieve high-quality repair of damaged valve core parts， a remanufacturing process method was proposed based on geometric reconstruction and path-pose planning. The principles of remanufacturing boundary preprocess were introduced to design the geometric characteristics of damaged parts in valve core and the implementation steps were described in detail. The boundary surface and the three-dimensional model of the valve core to be repaired were reconstructed with high precision based on NURBS theory. The remanufacturing processing path was generated using a cross-sectional plane method， and each interpolation point coordinates were calculated according to the line approximation and the error control principles. The spot area was combined with the interpolation point gesture to determine the dynamic positions of laser spray head. An ABB robot simulation system was used to verify the correctness of the laser cladding paths and the laser spray head positions. Subsequently， the remanufacturing experiments of valve core parts were performed through the execution code generated by the simulation system. The results show that the planned path and positioning in the method may effectively follow the remanufacturing boundary surface in valve core parts. The formed molten coating is relatively dense and does not find pores and cracks. The coating grain size and average hardness are as 14～54 μm and 573.6HV0.5±51.8HV0.5， respectively. The erosion resistance of the coating is improved by 30.8%. The processing method may meet the remanufacturing requirements of damaged valve core parts. 

Key words: valve core, remanufacturing, geometric reconstruction, processing path, position and posture, property