# Simulation Study of a New Magnetorheological Polishing Fluid Collector Based on Air Seal
## 1 Introduction
Many scholars have studied the wear if the polishing wheel in MR polishing. Some scholars have researched the material of the polishing wheel to enhance the wear resistance. [PERSON] et al. [21] took stainless steel as the base material, Ni-W-P as a hard alloy, and added wear-resistant particles, such as silicon carbide and hexagonal boron nitride, to coat the surface of the polishing wheel, and the wear resistance of the coating was 5.22 times that of 0 CT18 Ni9 Ti stainless steel. [PERSON] [22] used microcar oxidation technology to treat the surface of an LY12 aluminum polishing wheel and investigated the wear resistance of the ceramic film prepared by with optimal process parameters of the aluminum substrate, as well as the constant pressure and constant current mode in the MR fluid. The results showed that under a load of 5 N, the constant pressure film exhibited wear failure after 12 min. With an extension of friction time, the amount of wear on the aluminum substrate increased linearly, and the wear rate of the constant-current film increased slowly. Other scholars studied the collectors and wear mechanism of the polishing wheel. [PERSON] [23] first designed a magnetic seal device to collect MR fluid, which is widely used today. [PERSON] [24] designed a recovery device with soft a magnetic stripe in the small-diameter MR polishing device. The soft magnetic stripe with a magnetic induction intensity of 0.02 T was adhered to the opening of the collection pipe, which resolved the problem of the polishing liquid not being fully recovered. [PERSON] [25] used a scraper to collect MR polishing fluid in the inverted polishing device. The scraper scraped the polishing solution into the collector and pumped it into the recycling pool to stir evenly. [PERSON] [26] designed a U-shaped scraper collector with an opening consistent with the shape of the polishing wheel. The collector was coated with Teflonron or similar wear-resistant materials at the U-shaped port to improve its service life. [PERSON] [27] designed a collection method consisting of a built-in magnet to reduce the wear on the polishing wheel. The magnet was located inside the polishing wheel, and the magnetic field intensity was greater than that of the built-in magnet in the collector, which can keep the abrasive polishing particles in the magnetic seal away from the polishing wheel. [PERSON] et al. [28] established a semifixed abrasive wear model of the polishing wheel and analyzed the influence of different factors on the wear of the polishing wheel. The experimental results showed that the wear rate decreased with increased clearance of the recycler and first increased before decreasing with increased rotational speed of the polishing wheel. He [29] also proposed a collection method comprising presetting MR elastomers without abrasive polishing particles at the magnetic seal of the collector. After polishing for 5 h, the wear rate of the presetting magnetic seal polishing wheel was 0.2 mg/h, which was less than that of the working magnetic seal (1.2 mg/h). Although the above solutions reduce wear on the polishing wheel to a certain extent, it is not eliminated altogether due to the use of traditional magnetic force and a scraper seal. In this paper, a new collector using an air seal is developed. First, the geometric structure of the new collector was presented. Second, a fluid simulation model of the new collector was set up. Thirdly, the structural parameters of the new collector were studied using six-factor and three-level orthogonal experimental design method. By analyzing the fluctuation value of export mass flow and recovery efficiency, the optimal structural parameters were obtained. On the basis of the orthogonal test, the control variable method was used to further optimize the structural parameters.