Study On Low Pressure Casting Of Stator Blade Based On PCM Technology And The Modification Of Furan Resin For 3D Printing

The shape of the torque converter stator blade is complex.The time in traditional manufacturing and assembly process of stator blade Sand core is long and the dimensional accuracy is law.That leads to low production efficiency and low automation.In order to solve these problems,this paper integrates the numerical simulation and the PCM technology into the Low Pressure Casting of the torque converter stator blade in a loader,and studies the furan resin used in the micro drop jetting.Use the reverse engineering measure technology to measure the shape of the sand core and the torque converter stator blade and analyse.1.The furan resin used in the micro drop jetting is high in cost,large waste water and high free formaldehyde content in effluent.By using Paraformaldehyde instead of formalin(37%),ethanol instead of furfuralcohol and adding formaldehyde scavenger,the research of furan resin modification for micro drop jetting is carried out.the better synthesis scheme of modified furan resin was determined,that is,the substitution amount of polyoxymethylene to formalin(37%)is 50%,and the replacement amount of ethanol to furfuryl alcohol is 15%.The cost of the modified furan resin decreased by about 6.7%.In addition,the composition analysis of modified furan resin was carried out by infrared spectrometer.2.This paper first estimates the casting parameters,such as the lifting pressure,the filling pressure,the pouring temperature and the mold temperature according to the empirical formula,and then uses the MAGMA simulation software to carry out the orthogonal tests.The simulation analysis of the casting process of the stator blade is made.Finally,the proper parameters of the Low Pressure Casting for the stator blade are determined,that is,the lift pressure is 200mbar,the lifting pressure-adding velocity is 40mbar/s,the filling pressure is 360mbar,the filling pressure-adding velocity is 60mbar/s,the Pouring temperature is 690 ℃,and the temperature of sand core is 150℃.3.The micro drop jetting technology is used to print the sand core of the stator blade,and the integrated forming of sand core is realized.This solves the problem of the assembly error resulting from the reassembly of the sand core in the traditional core making process.It is determined that the printing parameters of the sand core as follows:the sand is 100/200 mesh calcined sand,the scanning speed of the nozzle is 145mm/s,the thickness of each layer is 0.5mm,the scanning line width is 1.5mm,and the Low Pressure Casting experiment of the stator bladeis carried out by the printed sand core and the parameters confirmed by the numerical simulation.The casting parameters are carried out according to the casting condition.FAROLaserScanArm,Geomagic Qualify and Geomagic Studio are used to scanned and analyzed the sand core and the stator blade casting.The analysis showed that the main deviation of the sand core was concentrated in the-0.2000mm～0.2000mm,and the deviation of the stator bladewas within the-0.3112mm-0.408mm.The stator blade castings come up to first grade of the standard JB/T9712-2001.