| The toughness of9SiCr alloy steel is better and has a good temper stability, thedeformation after heat treatment is small, the hardness after quenching can achieveHRC60, all of this excellent mechanical properties indicate that the9SiCr alloy steelwill continue to have a lot of application. After quenching the hardness of9SiCralloy steel is good and have a good wear resistance so9SiCr alloy steel often as thematerials of wear parts in machine tools industry. In the traditional production,grinding machining efficiency is very low, the9sicr often product by precisiongrinding. High efficient deep grinding as one method of high efficiency grindingtechnology and study the effect of the application in9SiCr alloy steel mechanicalprocessing have great practical significance.As one of the advanced processing technology, ultra-high speed grinding isfamous for high efficiency, long life of grinding wheel and good surface integrity.All the vantage of HEDG brought about a revolution to the traditional grinding fieldand broad the application field of grinding. So put the ultra-high speed grindingmethod into9sicr production become very significance.In this paper, the experimental investigation of machining characteristics andremoval mechanisms of9sicr alloy steel in high speed deep grinding was carry out inHunan university314m/s ultrahigh speed grinding test-bed. We using orthogonalmethod established experimental plan and discussed the influence factors,such asgrinding force transformation trends and influence factors, the surface morphologychange and characteristics of grinding. After the discussion and give the processingmethod more effective suggestions. At last, we use the FEM to simulate the grindingprocess and analysis the temperature field in HEDG.Through the experimental investigation of ultra-high speed grinding, we foundthat the material removal rate got huge ascension than the traditional grinding. Thechange trend of grinding force has a good relationship with the maximumdeformation of cutting swarf. When the thickness of cutting swarf decrease the ratioof the vertical force and horizontal force will increase and when grinding depthincrease the force will rapid reduce in some environment but the ratio of verticalforce and horizontal force change smoothly. Through the study, we also found thatthe power be consumption in the processing was diffident in different materialremoval rate through increase the depth of grinding or the velocity of worktable. Wealso found that the surface roughness is different when using different grinding wheel even through the size is alike. The quality of wheel finishing is very importantfor the grinding surface through the study of the surface photograph get by the3-Dmicroscope. The expression of material properties for the surface quality is differentin the different worktable velocity and grinding depth. We adopted thermocouple tomeasure the grinding temperature. The result indicate that the increase of thevelocity of the wheel and worktable can cause the rise of temperature.This article use the finite element analysis software of ANSYS to simulated theheat transfer mechanism in grinding. The result indicate that the change of worktablevelocity have very significant effect for the temperature field. The grindingtemperature increase slowly when only increase the grinding depth, the change oftemperature field not obvious. When the speed of wheel increase the maximumtemperature of the grinding area will increase significant and the temperature filedchange not obvious. Through the comparison of the experiment data and t hesimulation results, we find the way to determine the range of maximum temperaturein grinding surface use the measurement signal. |
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