1 finite yuan of model crankshaft intermediate frequency each journal section undertakes quench, part of journal of crankshaft connecting rod is axial symmetry appearance, n/ele be induced by backset and the electromagnetism field on the load that brings to bear on and workpiece, temperature field distributinging also is axial symmetry, because this is taken,quench the 1/2 part with sectional part makes calculation. Location of round horn of journal of the connecting rod below working status suffers stress the biggest, the article takes journal of a connecting rod to undertake building a model. Considering leakage magnetism phenomenon, need the partial air all round countershaft neck to build a model, crankshaft, inductor is included to reach in computational model all round air.  although actual in induction coil is quadrate and sectional hollow copper pipe, but because those who bring to bear on is in in computation,be current density load, because this is replaced with sincere,can not affect what be worth to coil electric current to compare test and verify hollowly. Use Plane13 of unit of 2 dimension substance to build an induction to heat physical field model. Graph 2 differentiate for physical field unit graph. Share 5910 unit, 4398 node. Graph unit of 2 physics field differentiates graph Nextpage 3.
2 inductions heat induction of result of temperature field computation heats time is 7 seconds, the article heats up induction of coupling law computation to quench temperature field heats in the process with direct magnetism. Undertake harmonic electromagnetism is analysed above all, undertake transient state heats up an analysis next, repeat inside different time-interval undertake electromagnetism field analysis will amend its the influence to temperature.  graph 3 heat for the induction the music axle temperature after the process ends spends distributinging figure. By the temperature of computational result distributinging cloud atlas can be seen the induction heats the surface is highest Wen Wei 992 ℃ , when these quantity of heat return future to pass into interior so that reach, the surface layer of be heated warms up quickly to be changed to austenite of above of austenite transition temperature. Crankshaft core temperature is room temperature 25 ℃ . Graph 3 inductions heat of of Fig3 The Temperature Field Of Induction Hardening In 7 Seconds of field of the temperature when 7 seconds 3.
Field of 3 cooling temperature is calculated in the imitate computation of the article, take no account of cooling process the steam film that initiative phase cooling fluid makes in crankshaft surface, heat exchange condition can simplify the heat exchange condition that is cooling fluid and crankshaft surface, in arrive without gush the surface of cooling fluid, press the computation of heat exchange condition of air and crankshaft surface.  the article analyses law computation to quench with transient state heat cooling temperature field. Use Plane55 of unit of 2 dimension substance to build quench model of cooling temperature field. Share 2800 unit, 2926 node. Graph 4 cool to quench temperature field is narrow yuan of model. Graph 4 quench cooling temperature field is narrow graph of yuan of of model Fig4 The FE Model Of Hardening Coolant Temperature Field 5 cool for eject cooling fluid the temperature field of 18 seconds, by the temperature of computational result distributinging cloud atlas can be seen crankshaft cools in eject cooling fluid after 18 seconds, exterior thermal drop comes 25 ℃ , core temperature is 197 ℃ . In cooling process exterior quantity of heat is conducted to core make crankshaft core temperature elevatory. Because exterior cooling rate is very rapid, exceeded critical cooling rate, exterior organization becomes martensite with respect to change and core is organized changeless. Graph 5 refrigeration the of temperature field Fig5 The Temperature Field Of Cooling In 18 Seconds of 18 seconds pursues 6 come to cool for long in air the temperature field when room temperature distributings, cooling in air time is 2300 seconds about. The course cools for long in air, crankshaft surface and core already replied room temperature 25 ℃ . Right now transient state stress can serve as leftover stress approximately. The graph cools in 6 air computation of imitate of field of 4 leftover stress is opposite the of of temperature field Fig6 The Temperature Field Of Air Cooling In 2300 Seconds Nextpage after 2300 seconds domestic and internationally in last few years the demand that its remains stress forecasts before component part is being made is more and more pressing, computational metal workpiece quenchs process remains stress, in mechanical on attribute an analysis a kind of heat plays plasticity problem. 4.
1 finite yuan of model because the article uses field of stress of indirect method computation, because this model is built,divide with reseau analyse must the computational model with temperature field is same, set air and induction coil unit to disable (NULL) is unit, temperature place is structural unit PLANE42 with unit PLANE55 changeover, hold unit number and knot check the number changeless. Finite of yuan of model and field of temperature of computational crankshaft refrigeration finite yuan of model is same (4) seeing a picture. 4.
2 computation pursue as a result 7 be field of stress of remains of the axial on journal of the connecting rod after quenching distributing, flat the leftover stress of paragraph of journal surface was achieved - 666Mpa, stress value achieves crankshaft core remains - 369 MPa. Graph of Fig7 The Axial Residual Stress Distribution of distributinging graph of stress of 7 axial remains pursues the 8 axial remains stress that for journal deepness of flat Duan Sui changes distributing. The abscissa shows the chooses crankshaft center distance inside crankshaft, ordinate states stress is worth size. From inside the graph the OK and intuitionistic remains that sees crankshaft surface concentration is very big presses stress. Leave the surface further to press stress smaller, when achieving certain distance, press stress for 0, turn to pull stress. Pulling stress is to increase first, reduce gradually next, great value appears among, crankshaft core presses stress for remains. Graph 8 journal are flat the axial remains stress that Duan Sui deepness changes distributings of of Fig8 The Axial Residual Stress Distribution Of Journal With Depth Change 4.
3 experiments and computational result trade off study used blind aperture law to undertake to the connecting rod journal of this crankshaft leftover stress checks. The meeting when bore causes add strain, because this measures an outcome,have certain error. The leftover stress that next watches are calculated for imitate and the experiment gets is compared. Leftover stress result is expressed quite by the watch 1 can see, computational imitate result and actual measurement value are basic be identical, this specification uses computer simulation to quench temperature field and leftover stress field have feasibility, the crankshaft geometry form that can develop level with already lying to optimize and leftover stress distributing provide reference. The imitate of temperature field numerical value that 5 conclusion quench through heating to crankshaft induction, can more thorough analysis induction heats reach quench the temperature of the crankshaft in the process changes, reach a design at quenching the development of craft is analysed with benefit. By the computation of leftover stress imitate result and actual measurement value are compared knowable, use computer simulation to quench temperature field and leftover stress field have feasibility, the crankshaft geometry form that can develop level with already lying to optimize and leftover stress distributing provide reference. CNC Milling