Design And Experimental Research Of Ultrasonic-assisted Magnetic Grinding And Finishing Equipment For Groove Surface

Hydraulic cylinder is an indispensable power transmission component of modern industry,and has a wide range of application prospects in national defense,aerospace and other fields.For a long time,improving the surface quality of the sealing groove of the hydraulic cylinder and solving the problem of smoothing the surface of the sealing groove of the hydraulic cylinder have important practical value for improving the service life and reliability of the hydraulic cylinder.However,the unique structure of the hydraulic cylinder groove,which is small in size,large in aspect ratio,and narrow in internal space,restricts various sealing groove surface processing techniques.In view of the above problems,this article takes the 30 Cr Mn Si hydraulic cylinder outer groove parts as the research object,and designs an ultrasonic-assisted magnetic grinding device.The purpose is to overcome the problems of weak magnetic grinding processing ability,low processing efficiency and single movement track of the magnetic grinding tool.The main research contents of this paper are as follows:(1)The force of magnetic particles in ultrasonic-assisted magnetic grinding is analyzed,the removal mechanism of ultrasonic-assisted magnetic grinding is studied,and the superposition method is used to establish the ultrasonic-assisted magnetic grinding material removal model.(2)Ultrasonic-assisted magnetic grinding device includes piezoelectric transducer,horn,ultrasonic generator,housing and magnetic pole,focusing on the design and calculation of magnetic pole and horn.Based on the principle of magnetic circuit design,the shape and size of the magnetic poles were determined,and the influence of the planar magnetic poles and the open magnetic poles on the magnetic field distribution on the bottom of the 30 Cr Mn Si trench was analyzed by magnetic field simulation,and the scheme of the open magnetic poles was determined;the four geometries were compared by the modal analysis method.The shape and the influence of the three materials on the horn modal,in the ultrasonic-assisted magnetic grinding device,an aluminum alloy stepped horn is selected,and the horn is optimized through modal analysis.(3)JL-109 special metal welding AB glue is used to connect the magnetic pole and the horn,and the modal analysis,harmonic response analysis and amplification factor analysis of the ultrasonic-assisted magnetic grinding device are carried out.The magnetic field strength and amplitude test experiments of the ultrasonic-assisted magnetic grinding device are carried out.The measurement experiment results of the magnetic field strength show that the ultrasonic vibration weakens the magnetic field strength less than one thousandth of the measured value,and the test value of the magnetic field strength agrees with the simulation value more than87.3%;the amplitude test results show that the ultrasonic-assisted magnetic grinding device The average amplitude of the middle magnetic pole opening position is 5.076 μm.(4)The groove bottom surface of the 30 Cr Mn Si hydraulic cylinder was processed by the ultrasonic-assisted magnetic grinding device,and the influence of the type of abrasive,the number of magnetic grinding tools and the processing gap on the roughness value of the groove bottom surface was analyzed.The results show that the material removal amount of the ultrasonic-assisted magnetic grinding device is 1.8 times that of the magnetic grinding,and the processing effect of the boron carbide magnetic abrasive is better than that of diamond;in the ultrasonic-assisted magnetic grinding,the 40-mesh boron carbide magnetic abrasive has a processing gap of 3mm The best processing effect is obtained under the processing conditions.The surface roughness Ra value of the groove bottom surface can be reduced from 1.889μm to0.597 μm,and the surface roughness reduction rate is 68.4%;the groove side wall roughness Ra value can be reduced from 1.0 μm to 0.6 μm or less,but the processing effect on the boundary position between the bottom and the side of the groove is poor.Through the calculation and simulation analysis of the ultrasonic-assisted magnetic grinding device,a device for smoothing and processing the groove parts of the hydraulic cylinder is designed.The performance of the device is verified through experiments,and new research is provided for improving the surface quality of the sealing groove of the hydraulic cylinder.Ideas,and ultimately contribute to improving the life and reliability of hydraulic cylinders.