锥筒型喷管内壁化学铣切工艺优化

锥筒型喷管内壁化学铣切后同一产品不同部位化铣槽深尺寸散差较大,且不同批次产品铣切后槽深尺寸散差波动也较大,对装配后产品稳定性造成了一定影响。分析认为:由于锥筒型喷管内壁零件的特殊性,化学铣切时零件不同部位溶液的扩散能力不同,导致不同部位铣切速率差异较大,最终不同部位铣槽深度散差较大。根据零件结构特点,设计出新型化学铣切转动装置,该装置实现了零件双向组合旋转,显著降低了零件不同部位溶液扩散差异性,提高了产品化学铣切槽深度尺寸均匀性。此外,研究了1Cr18Ni9Ti材料零件化学铣切时,杂质离子对铣切稳定性的影响,并确定了极限浓度,建立了杂质含量与零件铣切数量的对应关系,以此监测溶液质量,提高了化学铣切稳定性。

Optimization of chemical milling process for inner wall of conical tube nozzle

After chemical milling of the inner wall of the conical tube nozzle,the deviation of milling groove depth size is large in different parts of the same product,and the deviation of milling groove depth size also fluctuates greatly in different batches of milled products,which has a certain influence on the stability of the assembled product.The analysis shows that,due to the particularity of the inner wall of the conical tube nozzle,the diffusion ability of solution in different parts of products during chemical milling is different,leading to a large difference in the milling rate of different parts,and finally a large difference of milling groove depth size in different parts.According to the structural characteristics of the parts,a new type of chemical milling rotation device is designed.This device realizes the bi-directional combined rotation of the parts,significantly reduces the difference of solution diffusion in different positions of the parts,and improves the uniformity of chemical milling grooves depth size.In addition,the influence of impurity ions on the milling stability of 1Cr18Ni9Ti material during chemical milling was studied,and the limit concentration was determined.The corresponding relationship between the impurity content and the milling quantity was established,to monitor the solution quality and improve the stability of chemical milling.