Ceramic Bond CBN Grinding Wheel’s Preparation Under Condition Of Strong Magnetic Field And Its Grinding Performance Research

In recent years,the strong magnetic field has been widely used in the field of material preparation,and it plays a more and more important role in the research of material preparation.This paper is supported by the national natural science fund(NO.51275084).For ceramic bond CBN grinding wheel,the orientation of grinding grains is random and the intensity of samples is low.So the preparation of ceramic bond CBN grinding wheel was carried out under the condition of strong magnetic field,and the grinding performance of the strong magnetic field grinding wheel was investigated in detailed.In this paper,we controlled the CBN grits orientation by using the magnetic fields.By using this method,the structure of the ceramic bond CBN grinding wheel has been improved.On the other hand;ceramic bond and nickel plating CBN ceramic materials were researched under strong magnetic field.It provides a good reference for using the strong magnetic field to improve the performance of the ceramic bond CBN grinding wheel.In this paper,starting from the formula of ceramic bond,the influence of alkali metal oxide and transition metal oxide on ceramic bond was studied.And on this basis,the influence of strong magnetic field on ceramic bond was studied.In order to optimize the orientation of the grains,the nickel plating CBN grains was used,and the influence of magnetic field on the nickel plating CBN grains was studied.And under the environment of strong magnetic field sintering,the ceramic bond CBN grinding wheel was manufactured.At the same time,in view of the structure of strong magnetic field ceramic bond CBN grinding wheel,the grinding characteristics of strong magnetic field ceramic bond CBN was systematic studied on the basis of theoretical analysis,by using the combined method of simulating and testing.Summarizing the full text,the research work and achievements was summarized as follows.(1)It can improve the strength of ceramic bond to a certain extent by adding the alkali metal oxide.And with the increase of the content of alkali metal oxide,the strength of ceramic bond reduced instead,when the molar content of alkali metal oxide was equal to the molar of aluminum oxide and boron trioxide,the strength of ceramic bond would be highest.In improving the ceramic bond performance,lithium oxide and sodium oxide is superior to potassium oxide.It can improve the comprehensive of the ceramic bond by adding zirconium dioxide.And it is beneficial in improving the strength of the ceramic bond,improving the microstructure and restraining the micro cracks between ceramic bond grits.But the adding amount of zirconium dioxide should be controlled,when the adding amount is about 8wt.%,the performance of ceramic bond is best.(2)The effect of strong magnetic field on Ordinary CBN grits and titanium plating CBN grits was very small,but for the nickel plating CBN grits,the effect was very significant.The nickel plating CBN would realize rotating under appropriate magnetic field intensity,and the long axis direction of the nickel plating CBN grits was consistent with the direction of magnetic field.On the other hand,the nickel plating CBN grits could realize rotating and moving in the ceramic bond powder under the action of alternating magnetic field.And it could make the long axis direction of the nickel plating CBN grits was consistent in the mould’s cavity.The excellent ceramic bond CBN samples in orientation would be prepared by using this method.(3)It could change the orientation of stomatic distribution in ceramic bond by using the strong magnetic field technology.And the strength of ceramic and ceramic bond CBN material would reduce to a certain extent.But it has a positive effect in grain orientation and grain refinement.For nickel plating CBN grits,strong magnetic field has an obvious effect,and it will promote the migration of nickel.So the integration of ceramic bond and nickel plating layer strength will be enhanced.In sintering the ceramic nickel plating CBN material,it will improve the strength of the ceramic nickel plating CBN material by proper increasing the magnetic induction intensity,if the magnetic induction intensity is too high,the strength of the ceramic nickel plating CBN material will reduce.(4)On the basis of deep analysis of grinding theory,the single grinding blade grinding force model was established through analyzing the no deformation chaps.On the basis of analyzing the grain size and the grinding wheel surface topography,the statistical model of grinding force was established and the dynamic grinding force could be predicted.Begin from the grinding heat source,the temperature field model based on finite difference method was established.It could calculate the grinding temperature field through the determination of grinding force.In addition,by using the algorithm,the energy coefficient of strong magnetic field ceramic bond CBN wheel grinding TC4 titanium alloy was obtained,and the energy distribution coefficient was about 5%under the condition of dry grinding.(6)A series of experimental studies about grinding test on titanium alloy TC4 and aluminum oxide were carried out.And it showed that the strong magnetic field ceramic bond CBN grinding wheel has a superior grinding performance by comparing with ordinary ceramic CBN grinding wheel’s test results.