THE ADVANCED AUTOROTATION TOOL FOR PLANING
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1 5th INTERNATIONAL MEETING OF THE CARPATHIAN REGION SPECIALISTS IN THE FIELD OF GEARS THE ADVANCED AUTOROTATION TOOL FOR PLANING doc. Ig. Jozef PILC,CSc. doc. Ig. Aa MIČIETOVÁ,PhD. Ig. Mária ČILLIKOVÁ,PhD, doc. Ig.Já Salaj, CSc Departmet of Techological Egieerig, Faculty of Mechaical Egieerig, Uierity of Žilia,Veľký diel, Žilia, Sloak Republic Abtract: Progreie machiig cofiguratio iclude alo the machiig ith rotary tool, hich motio i deried from iteractio force reult from machiig proce. Thi reie itroduce theoretical tartig poit, hich i ery importat for deriatio formulae, for ork geometry of rotary plae tool. At ear deriatio formulae for determiatio ork geometry tool, i utili method gradual project ector of motio. Thi deriatio formulae i utili for deig of cotructio of plae tool. I thi reie i deig of cotructio plae tool hich utili priciple rotary of cuttig part. Keyord: Autorotary tool, Tool agle, Cotructio of Plae Tool, Tool i u Sytem, Plaig 1. Geometry of cuttig part of rotary tool Arbitrary poit of cuttig part tool exert thi motio : motio of feed ith peed f cuttig peed motio of cuttig part roud axi - a Baic formulae for determiatio ork geometry tool : γ e γ σ tgα e tg( α + σ ). coλ here: γ e orkig orthogoal rake γ tool ormal rake σ auxiliary agle for calculatio α e orkig orthogoal clearace α tool ormal clearace λ orkig tool cuttig edge icliatio Agle ad too ork agle of icliatio cuttig part -, ere deriatio accordig to of commo method of determiatio ork agle [2]. Ece of method reide i that geometry parameter e ca obtai gradual project ector of motio tool. Object of aalyi i arch of cour ector hich i ector of reultat peed machiig proce. Vector, e ca determie tha reultig of compoet N ad T. (fig. 2). 263
2 The differece are igificat that i hy tool agle caot be determied for the phyical proce located i machiig zoe ad cotact urface of tool. Equatio for orkig geometry of plaig tool [1] ere calculated by uig the method of tep by tep projectio of moemet ector..i λ.iψ tg σ. iψ.coλ ( ξ i λ.coψ ) coλ.coσ Thi calculated equatio are alid too for a egatie tool cuttig edge icliatio λ. If agle tool cuttig edge icliatio i egatie thu cuttig edge chage cour of rotary. For agle σ are alid : ±.iψ ± ( ξ i λ.coψ ) coλ.coσ Negatie ig i alid for egatie agle cuttig edge icliatio λ. Agle of touch ψ (fig.1) of poit cuttig e ca determied accordig to of formula: R a p a coψ 1 R R p here : ξ. c ad coefficiet ξ: ξ: i λ Fig.1 Scheme for calculated agle ψ 2. Aalyi of geometry cuttig edge of rotary plaig tool hich i adjut ith double agle icliatio cuttig edge 264
3 From of theoretical aalyi of ork geometry tool of turig [3] reult that for ork of tool i good ad uitable plaig tool lea teel i plae perpedicular to axi of orkpiece. So e are obtai tool ith double cuttig edge icliatio ( λ ; ad Θ ) here: λ a tool cuttig edge icliatio Θ - agle icliatio of tool i back plae From fig. 2 reult : Subquetly : 3 + here : coθ.coλ.coθ.i λ 2 2.iθ.coψ.iθ.iψ 1 5.iψ.coθ.i λ.iψ.coψ.coθ.i λ.coψ. coθ.i λ.iψ +.iθ.coψ.coθ.coλ After mathematical arragemet : coψ. iψ + tgθ co λ Likei e ca determie ork agle of cuttig edge icliatio λ. here: T N T N coθ.coλ coσ coσ ξ. +.iθ.iψ.coθ.i λ.coψ We ca uppo, that at egatie agle λ, cuttig edge chage cour of rotary. Afterard commo equatio for determie of agle σ ad λ they are: here : coψ ±.iψ + tgθ coλ ± ( ξ + iθ.iψ coθ.i λ.coψ ) coθ.coλ..coσ 265
4 Sig (-) apply for egatie agle cuttig edge icliatio λ. O the foudatio determie of equatio e ca calculate alue ork geometry of agle. Thi equatio e ca u for arbitrary i coditio of ork of tool a i arbitrary poit of cuttig edge determie real ork geometry of agle, hich are determie reult ork of tool. Fig. 2 Work agle of plaig tool ith double agle cuttig edge icliatio. 3. Cotructio of plaig tool Cotructio of plaig tool eable chage tool cuttig edge icliatio -. At project of cotructio autorotary tool i eceary go out from requiremet: high of tough cotructio tool, 266
5 high of preciio motio tool (radial circular ruout ad actio) high reliability motio of tool, hich e cure uitable cotructio of tool. I ork of author e ca acquait ith cotructio of lathe, millig ad plaig tool. Geerally e ca affirm, that uitable are tool, hich ha of rotary part fit i lidig bearig. Fit i atifrictio bearig i ot uitable. The formulae ere utili at project of plaig tool. Poibility of miimum radial clearace ttig, ad eay ay of lidig urface lubricatio. Experimet tacked place motly i real productio coditio. Thi e plaig tool deig ha eral adatage for may group of machied material. Workig rage of tool ere cofirmed experimetally, i agreemet ith theoretical cocluio. From reult of theoretical aalyi of ork geometry follo, that i uitable thi plaig tool adjut ith double agle cuttig edge icliatio ( λ ; Θ ) here agle λ i alterig. The agle you ca recommed cotat (Θ 5 o ). Very importat characteritic of tool i due to frictio of chip ad face tool ad orkpiece flak tool. I body of plaig tool (fig.3) i coical ca Cu S8 (1), i ca i rotary cuttig part of plaig tool (2). Miimum radial clearace e ca adjut auxiliary of cre (3) ad ball φ 6mm (4) Scre (5) iure of cre agait rotary. Scre plee o the rotary part of tool re for forced of oitmet. Fig. 3 Scheme of miimum radial clearace ttig ad lidig urface of rotary cuttig part plaig tool. 4. Cocluio O the rudimet of theoretical aalyi of ork geometry rotary tool, he a cotructed thi plaig tool ad a performed experimet. From the reult e ca recommeded: For the reliable rotary moemet of cuttig part of plaig tool i mot importat right defie miimum radial clearace ad lidig urface lubricatio. Experimet tacked place motly i real productio coditio thi e plaig tool deig ha eral adatage for may group of machied material. Uig of tool ith circular cuttig edge tho ca ig ith autorotatio i perpectie amely for machiig of extremely hard material to remoe heat from platic deformed zoe. Rotary of tool determie maily cuttig ad tool cuttig edge icliatio λ. A tool cuttig edge icliatio λ e ca recommeded i extet λ o. Cuttig peed for thi tool e ca recommeded importat higher, tha at claical plaig tool. 267
6 A tool ear be ituated oly o the flak of tool. The plaig tool hae extremely high tool life. Referece [1] Pilc,J.- Mičietoá, A. : Obrábaie koo autorotujúcimi átrojmi,edis Žilia 2003, ISBN [2] Neluša,M.- Czá, A. : Obrábaie titáoých a ikloých zliati,edis Žilia 2001, ISBN [3] Poppeoá,V.- Čuboňoá,N. Uríček,J. Kumičákoá,D.: Automatizácia trojárkej ýroby, Žiliká uierzita Žilie EDIS ydaateľto ŽU 2002, ISBN [4] Mičietoá, A.- Pilc, J. - Salaj, J.: Obrábaie autorotujúcim átrojom - možý prítup k zyšoaiu produktiity. I: Produktiita 3/2001, dojmeačík Sloekého cetra produktiity, ISSN , tr
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