Analysis of invalidation of razor blade of treatment of helix bevel gear and improve a design

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  • source:EDON CNC Machining
Helix bevel gear and straight bevel gear and inclined tine bevel gear are compared, have jackknife coefficient big, carrying capacity tall, drive smooth, noise is little wait for good performance, be applied extensively in the mechanical product such as railroad engine, shipping, car, tractor, improved the dependability of these products and service life. The article is research target with developing CNC Milling of medium some large helix bevel gear, the problem that in the light of its the razor blade when milling appears undertakes analytic keeping abreast of going optimizing improvement. Graph 1 it is the specific operating mode when the spot is machined, the geometrical model of bit is built in SolidWorks of three-dimensional cartography software, guide ANSYS is finite yuan of analysis software, according to the cutting force data that spot experiment gets, to load seeks solution, get its stress isopleth and isopleth of meet an emergency pursue, optimize according to what the result has bit structure improve, the stress volume that reduces bit counteracts meet an emergency, improve cutting tool life. If the bit geometry structure that the problem that bit exists creates according to original design pursues 2 are shown, objective photograph is shown 3 times like the graph. The problem with exist particular character because of the geometrical structure of bit and material, the service life that causes bit is extremely brief, in use process, bit round part is too small cause stress easily to center, if the invalidation circumstance that bit appears pursues 4 (collapse blade) , because at present bit did not add film, bit can appear invalidation circumstance pursues 5 (damaged) , can appear when breakdown now and then if pursue,cutting tool blocks a circumstance 6 (rupture) . Graph the treatment status when 1 mill ages (photograph of cutting tool structure) pursue collapse blade builds the 4 razor blade of actual figure figure of the 3 razor blade of geometrical model attempt of 2 razor blade finite of model of yuan of model razor blade build and the differentiates to build bit in SolidWorks geometry of reseau, guide its the analysis undertakes in ANSYS. Solid Tet 8node 185 of choice computation unit (Solid 185) . Bit material is hard alloy, take its mechanical function is: Density ρ ＝ 7700kg/m? , stretch model measures E ＝ 2.

1E11 Pa, poisson compares η ＝ 0.

25. Graph damaged of 5 razor blade pursues 6 knives segment cracks use freedom reseau command differentiates reseau, to bolt join stress is in reseau to refine processing centrally, increase result accuracy. Gain is narrow 47104 of yuan of model division check the number, unit number is 40950, if pursue,as a result 7 are shown. Graph the reseau of 7 razor blade differentiates in because bit is machining a process,restraining a condition, not the shift of photograph of be patient of to knife handle, outfit of requirement razor blade places firm, because this holds the range of clip and knife handle contact to cutting tool,add displacement tie. Of bit and knife handle if the graph is shown 8 times,cooperate actually. Graph 8 razor blade and objective of outfit of knife handle ministry apply to load to carry on one's shoulder or back and the bevel gear of 1540 Mm of diameter of computational experiment treatment ages when base, the TNC Scope of data processing software that uses system of HEIDENHAIN numerical control to be taken oneself bears to cutting tool the size of load has a record, the size of the load that gets cutting tool gets in different cutting process reachs his to change. Through using different treatment parameter has a test, the cutting parameter that gets machining the correspondence when exterior quality is best is feed F ＝ ＝ of N of rotate speed of 5 Mm/min, main shaft 75.

36m/min, penetration of a cutting tool measures Ap ＝ 32 Mm. The size that gains its cutting strength through TNC Scope is 2844N, bring to bear on its to undertake to cutting blade as load finite yuan if pursue,the analysis gets a result 9, the graph is shown 10 times. Graph the isopleth of meet an emergency of 9 razor blade pursues graph the graph improves the stress isopleth of 10 razor blade the method is centered to reduce stress and meet an emergency, can increase round role appropriately, reduce its stress concentration and strain, the problem that because accumulate bits,to what appear possibly the cutting tool that brings about too much is blocked, the chamfer that discharge bits can increase on bit, the change cuts the dimension of bits and form, rupture to bit TiAlN coating can increase on bit in order to increase its strength. The model after bit is revised differentiates the eventuate of reseau pursues 11, the others is finite yuan of pre-treatment condition and before improving identical. To the load of correspondence of experiment of its to load, undertake finite yuan of analysis computation, if isopleth of gotten stress, meet an emergency pursues 12 with the graph 13. Graph 11 improvement bit differentiate reseau pursues the isopleth graph of 12 stress pursues the 1 comparative conclusion course that optimizes around checks the isopleth chart of 13 meet an emergency of original structure razor blade finite the contrast of yuan of analysis and spot test result, get this structure razor blade is machining the main problem of the process and inducement, the settlement that is this kind of problem provided the basis that can consult. The analysis after be being improved to bit proved the feasibility of this kind of method as a result, the round horn of bit and the accretion of the chamfer that discharge bits are theoretic only can solve these problems, still need the site the test and verify of real test. CNC Milling CNC Machining