血泵壳体零件高精度面研磨方法

High-precision Surface Grinding Method of Blood Pump Shell Parts

心室辅助装置(Ventricular Assist Device,VAD)是非药物治疗心力衰竭的装置,其核心部分是血泵。在机械加工过程中,对血泵壳体内部的表面研磨质量有非常高的要求(Ra≤0.04)。结合血泵壳体结构,采用有限元分析对血泵壳体内表面研磨去量差异进行研究,并设计制作了梯次直径研具(Φ10、Φ30、Φ40),用来抵消血泵壳体内表面径向研磨去量差异带来的摩擦力受力不均问题。此外,采用自制研料确定了粗研(m28~m10)、半精研(m7~m5)和精研(m2~m1)三级研磨工艺,研磨后血泵壳体内表面粗糙度在Ra0.08~Ra0.014,满足血泵内部表面质量要求,为后续涂层工序提供了可靠的表面质量。

The ventricular assist device(VAD)is a device for the treatment of non-pharmacologic heart failure,its core part is blood pump.During the mechanical processing of blood pump,there are very high requirements for the internal surface grinding of blood pump shell(Ra≤0.04).Combined with the structure of blood pump shell,the difference of grinding amount on the internal surface of blood pump shell is studied by finite element analysis,and the step diameter grinding tool is designed and manufactured(Φ10、Φ30、Φ40),which is used to offset the uneven friction force caused by the difference of radial grinding amount of the blood pump shell internal surface.In addition,the three-level grinding processes of coarse grinding(m28~m10),semi-fine grinding(m7~m5)and fine grinding(m2~m1)are determined by using self-made grinding materials.The surface roughness of the blood pump shell after grinding is Ra0.08~Ra0.014,which meets the internal surface quality requirements of the blood pump and provides reliable surface quality for the subsequent coating process.