Research On The Manufacture Of Abradable Seal Coating Scraped Testing Machine

Radial clearance between the rotating parts and the casing of the aircraft engine(gas path seal gap) has significant influence on their work efficiency, power andfuel consumption and other indicators. In order to reduce the gas path seal gap,commonly seal coat was used in air passage gap portion of the engine. when theengine blades scraping seal coating, it will consume all of the engagement itself,thereby ensuring the blade wear or affinity does not occur. Now, the engine sealcoating is one of important technologies widely used in aviation, since the sealcoating can improve the engine seal between the rotating and fixed member, therebycan significantly improve engine performance.Bench test method was used to test and evaluate the performance of sealcoating material quantitatively in developed countries. Due to equipment limitations,domestic test speed can not exceed200m/s, that is far below the actual engineoperating conditions, so the the authenticity and accuracy of the test was affectedseriously. In order to accurately assess the actual condition of the engine sealcoating material properties, developed seal coating test equipment with scrape linespeed igreater than400m/s, work area temperature greater than600C is necessary.In this paper, the difficulty of the development process is analysised, based ona comprehensive abroad analysis of seal coating test equipment. The keytechnologies include: ultra-high-speed spindle system, heating and cooling andinsulation systems, security systems, etc are discussed in detail. Machinery andelectrical control system’s design and test verification of the experiment test systemwas carried out. The relationship of the wheel diameter and s peed was found, andcarried out the spindle selection, finally through the spindle selection, test linespeed can greater than400m/s. The maximum allowable unbalance of the ultra-highspeed spindle was obtained through the spindle balancing calculations, so reliableoperation of the test machine was provided. The finite element calculation,simulation and design of the heating, insulation, cooling system on the test machinework area ensure the operating temperature of the test area, while preventing impacton other components of high temperature. The finite element calculation, simulationand design on the test machine guard ensure the safe operation of equipment. The final completion of the ultra-high-speed spindle running test, scrapers forcemeasurement test and seal coating scraping test prove that the test subjectsdeveloped a seal coating testing machine which can meet the performance testingand evaluation of the coating material under the high temperature and high speedconditions of the testing and evaluation of the performance.