Technique of Precision Grinding on Ferrite Yoke Parts
ABSTRACT
In this thesis , the surface roughness, hardness, micro-defects of ferrite ceramic materials were studied, combined with grinding parameters such as wheel speed, grinding depth and workpiece speed and make use of the single factor and orthogonal tests of the different grinding parameters on the laws of surface roughness, hardness, micro-defects and so on. The process parameters were optimized to reduce the grinding surface roughness, for the basis of ferrite components grinding, grinding surface morphology of the ferrite was observation by electron microscopy and analyse the materials removal mechanism of grinding.
1）Ferrite grinding surface roughness Ra was smaller when the wheel grinding speed vs increase, and largen with the workpiece speed vw or grinding depth ap was increased, By the orthogonal tests can be seen that surface grinding in the grinding wheel speed vs and workpiece speed vw have greater impact on the surface roughness,but grinding depth ap was little.
2）Grinding process parameters effect on ferrite surface hardness is not significant, the hardness after grinding is greatly influenced by the grinding temperature, less affected by the grinding force. The higher hardness of the workpiece when the low wheel speed, higher workpiece speed and grinding depth.
3）Ferrite grinding surface mainly formed by the continuous or discontinuous cutting streak, brittle fracture and plastic deformation zone. In the smaller workpiece speed vw , grinding depth ap and larger wheel speed vs , the material was easy to remove by plastic deformation and obtain better surface quality.
4）The grinding of ferrite components, it is also prone to cracking, chipping phenomena, mainly due to the high material hard and brittle and excessive force, choosing reasonable parameters and grinding wheel dressing can be avoided.
Technique of Precision Grinding on Ferrite Yoke Parts
ABSTRACT
In this thesis , the surface roughness, hardness, micro-defects of ferrite ceramic materials were studied, combined with grinding parameters such as wheel speed, grinding depth and workpiece speed and make use of the single factor and orthogonal tests of the different grinding parameters on the laws of surface roughness, hardness, micro-defects and so on. The process parameters were optimized to reduce the grinding surface roughness, for the basis of ferrite components grinding, grinding surface morphology of the ferrite was observation by electron microscopy and analyse the materials removal mechanism of grinding.
1）Ferrite grinding surface roughness Ra was smaller when the wheel grinding speed vs increase, and largen with the workpiece speed vw or grinding depth ap was increased, By the orthogonal tests can be seen that surface grinding in the grinding wheel speed vs and workpiece speed vw have greater impact on the surface roughness,but grinding depth ap was little.
2）Grinding process parameters effect on ferrite surface hardness is not significant, the hardness after grinding is greatly influenced by the grinding temperature, less affected by the grinding force. The higher hardness of the workpiece when the low wheel speed, higher workpiece speed and grinding depth.
3）Ferrite grinding surface mainly formed by the continuous or discontinuous cutting streak, brittle fracture and plastic deformation zone. In the smaller workpiece speed vw , grinding depth ap and larger wheel speed vs , the material was easy to remove by plastic deformation and obtain better surface quality.
4）The grinding of ferrite components, it is also prone to cracking, chipping phenomena, mainly due to the high material hard and brittle and excessive force, choosing reasonable parameters and grinding wheel dressing can be avoided.
