Ukuthi yini indlela yokuhambisana imishini yokuqondisa kwe-EDM nezinto eziphathelene ngezinhlobo zezinto ezinamaphathi okusebenza

Imiphumo Yemithombo Ekhuluma Nokugcinwa Kwemishini Yokuphatha Kwemisiphepho Yemvelo

Ukuhlanya kwelekthrikhu nokuthi kungaphansi kwelekthrikhu: Amadriver amabili okuvula kwemisiphepho nokukhula kwezindawo zokuhambisa imisebenzi

Ukuthi kubonakala kwamandla amanqaku akhona kuyisiphumo esibonakalayo sokugcina ukuthi kubhekwa kwe-EDM. Amathuba okusebenza okuncane—njengokwamathuba okusebenza kwe-copper (1.68 × 10⁻⁸ Ω·m)—ayenza ukuthi kubhekwe kwe-dielectric kubhekwe kahle futhi kubhekwe kwe-spark kubhekwe kahle nokusebenza kahle. Ngaphandle kwalokho, amathuba okusebenza okuphezulu njengokwamathuba okusebenza kwe-tungsten (5.6 × 10⁻⁸ Ω·m) ayakhula ukuthi kubhekwe kwe-voltage kwenqamuka yamandla, okukhula ukuthi kubhekwe kwe-energy ekhulula kumsebenzi wokusebenza futhi kubhekwe kwe-arc kanye nezinkinga zokubhekwa kwezinye izindawo (Gostimirovic et al., 2012). Amaphuzu asekhlabalabha abonisa ukuthi amathuba okusebenza okuphezulu kune-100 μΩ·cm azidinga ukuthi kubhekwe kwe-pulse generator ngokucacile ukuze kubhekwe kwe-spark kubhekwe kahle. Ngoba ukuthi kubhekwe kwe-resistivity kubhekwe kahle kubhekwe kwe-ionization threshold kanye nokubhekwa kwe-stability yamandla, ukubhekwa kwe-resistivity kabefore ukusebenza kuyisidingo sokubhekwa kwe-process windows okunconywa kanye nokubhekwa kwe-dimensional accuracy.

Ukuthi kubhekwe kwe-thermal conductivity kanye nokuthi kubhekwe kwe-melting point: Kuzoba kubhekwe kahle kubhekwe kwe-material removal rate kanye nokubhekwa kwe-recast layer quality

Imiphumo yezindlela zokuthakatha kuyisisekelo sokuphatha kanye nokubaluleka kwesikhundla. Ukuthakatha okukhulu—okuboniswa ngomthwalo we-aluminium (≈237 W/m·K, ipoyinti yokuchitha 660°C)—kusiza ekuthumelweni kwezinto ezinkulu zokuthakatha, kusiza ekuthumeleni kwezinto zokuthakatha (MRR) ngaphezu kwe-500 mm³/min kusinker EDM. Kodwa lokhu kuthakatha okusheshayo kuyenza ukuthi kubhekwe isilayela esincane kodwa esikhulu. Amasuphaloyi e-nickel njenge-Inconel 718 ayabika indlela eyodwa: ukuthakatha okuncane (~11 W/m·K) nokuchitha okuphakeme (~1330°C) kuyenza ukuthi izinto zokuthakatha zizimele kwindawo yokuqinisa, kubeka MRR ngaphezu kwe-40 mm³/min futhi kusiza ekuthengiseni isilayela esikhulu kanye nesingaphili. Izimboni ezihloniphiwe zibonisa ukuthi ukuthakatha okuphambili—akukho isikhathi sokugcina kuphela—kuyisisekelo esikhulu sokubala ubude besilayela esibomvu (Liao et al., 2020). Ngakho ke abasebenzi kufanele bakhethwe amandla okugcina ukuze baphathele ukuthi MRR kuyasebenza ngendlela efanele kanye nokuthintela isilayela—ikakhulu kuma-alloyi okungafaneli ukuthakathwa.

Ukukhetha Umkhakha Wokugcina Ukuze Kwenzeke Ukusebenza Kwemishini Yokugcina Ngokupheleleyo

Ukukhetha umkhakha owodwa okuhle kuyisisekelo sokuthola isiphumo, ukuphepha nokubaluleka kwesifunda. Imipropathi yomkhakha yokugcina ngokwelektriki, ngokwesikhathi nezinkulungwane ziyathuthukisa ukuthola isiphumo, ukuthabatha kwezinkulungwane nokubaluleka kwesifunda—ngakho ukukhetha umkhakha owodwa kuyisisekelo sokuphatha imishini.

Amakhakha e-graphite: Okuhle kakhulu kumakhakha okuphezulu kokushisa njenge-Inconel ne-titanium

I-graphite liyaphakamisa kakhulu ekukhuliseni amalayi e-temperature ephakeme ngokwesibonelo sokuphakama kwe-sublimation (~3,650 °C) nokuthula kwe-coefficient yekhishwa komoya. Lezi zindlela ziyabeka isikhundla sokugqibela kwe-Inconel ne-titanium, zibeka izimo ezihle zokugqibela ngeminye imizuzu yokukhulisa i-deep cavity noma i-complex contour. I-graphite iba ne-MRR engaphezulu kune-copper ngemiphumela yezinkampani ezingaphezulu kune-20–30% ngemizuzu yokukhulisa okuphambili—ngokwesibonelo sokubona i-high peak currents ngaphandle kokugcina kakhulu (iziqu zezinkampani, 2023). Izinkinga zakho zingaphezulu kwe-friability—kudinga ukususa okuphelele ukuze ubhekise ukungabi nesilika esingasendaweni—kanye nokugcina okuphezulu ngemizuzu yokugqibela okuhle. Kumaqondo ase-aviation apho ukusuka kwezinkampani ne-thermal resilience ayisikhundla esikhulu kunezinkinga zokugqibela okuhle kakhulu, abaprofesi bokuqala be-EDM bayathemba i-graphite.

Amaphathi we-copper ne-brass: Ukubalansha ukuphepha, ukuthula kwe-wear, nokuthula kwe-thermal kumaqondo we-steel ne-stainless steel

Icopper yisibonakalise isibonelo sesikhundla sokugqamisa kwezinto zokusebenza zomthwalo noma zomthwalo wokuphatha ngokupheleleyo, apho ukubonakala kwesikhundla, ukuthi isikhundla sikhuluma ngokupheleleyo, nokungafani kwezinto zokusebenza kuyizinkinga ezibalulekile. Ukuthi icopper inelektrikhi ne-thermal conductivity enkulu (≈400 W/m·K) kusinika ukuthi izinkampani zokugqamisa ziyasebenza ngokupheleleyo futhi kusinika ukuthi umthelelo wokuchitha amandla kusikhundla phakathi kwezikhundla—okuvumela ukuthi izikhundla zokubuyiselwa zibe nzima futhi izikhundla zokubonakala zibe nzima. Ibrass, okuyizinhlobo zamacopper nezinc, iyathola ukuthi kufanele kusebenziswe ngokupheleleyo futhi iyasebenza ngokupheleleyo kwezindlela zokugqamisa ezingaphansi kokuzimisa, kodwa ukuthi kuyadlula kakhulu kuyavumela ukuthi kusebenziswe kancane. Kwezindlela zokugqamisa ezidinga isikhathi eside, ukudlula kwesikhundla sokugqamisa kwe-copper kuyabona kusukela ku-0.1–0.2%, okuvumela ukuthi kuboneke ukuthi kuyasebenza ngokupheleleyo (±2–5 µm) ngaphandle kokubuyiselwa kancane. Uma kubhekiswa ngokupheleleyo ngamaparameta—njengokuthi izinkampani zokugqamisa zingaphansi futhi ukuthi izinkampani zokugqamisa ziyakhula—icopper iyasebenza ngokupheleleyo ukuthola ukubonakala kwe-Ra 0.2–0.4 µm okubalulekile kwezinto zokusebenza zomthwalo noma zomthwalo wokuphatha.

Ukuhlela kwezimpawu zokugqamisa kwezinto zokusebenza zomthwalo ngokwesithi sezinto zokusebenza

Isikhathi sokubuka kanye nezimvu zokuphakama: Izinkinga zokuhlanganisa ubukhulu bocingo phakathi kwe-tungsten carbide nase-nickel-based superalloys

Isikhathi sokubuka kanye nezimvu zokuphakama ziyabuyisela umthelela wokugcina ngosikhephe—kodwa ngoko ke ubukhulu bocingo—ngaphakathi kwemifamili yezinto. Kuma-tungsten carbide, izimvu eziningi zokuphakama (ngaphezulu kwe-2 A) zibiza imikhumbu eminye kanye nezincwadi zokubuyiselwa ezingaphansi kwe-10 µm (Chen et al., 2022). Ngoko ke isikhathi esincane sokubuka (5–10 µs) siyashoqwa ukuthi sibuyisele isikhundla sokugcina kanye sibuyisele ubukhulu bocingo. Amasuperalloys ase-nickel njenge-Inconel 718 ayasebenza ngendlela eyodwa: ubukhulu bakho bokugcina kubuyisa ukuthi kufuneka kubhekwe izimvu eziningi zokuphakama (12–15 A) ukuze kubuyiswe ukubuyiselwa kokubuka okuphelele, okubuyisa izincwadi zokubuyiselwa ezingaphezulu kwe-30 µm—noma kunjalo kuzoba kusebenza kumaphuzu okubuyiselwa. Ukuchaza okuphakathi kwe-MRR nokubuyiselwa kocingo kubuyisela ukuthi kufanele kwenziwe ngokusebenzisa izindlela zokuguqula iziphakamiso: iziphakamiso ezinkulu ukususa izinto eziningi, emva koko kubuyiselwa ngokuphakama okuncane kakhulu ukugcina.

Ukubaluleka kwezikhathi nezikhathi zokusebenza: Ukunciphisa ukuphatha kwemithambo yokuqala ngokusebenzisa izinkulungwane eziningi zezinto ezingenakwazi ukuthi zihlambekile

Ukubaluleka kwezikhathi nezikhathi zokusebenza kuyisibonelo esibalulekile sokukhokha ukuphatha kwemithambo yokuqala ngokusebenzisa izinkulungwane eziningi zezinto ezingenakwazi ukuthi zihlambekile. Ukongeza ukubaluleka—kuma-10 kHz ku-50 kHz—kunquma inombolo yezikhathi zokugcina ngosekondi, futhi kunciphisa imali yezikhathi zokugcina ngosilinganiso, ngakho-ke kunciphisa ukuphatha kwezinhloko zemithambo yokuqala nokuthuthukisa ukuthuthukisa kwezinhloko. Isikhathi sokusebenza—umbalo wesisikhathi sokusebenza kusikhathi sokugcina—kufanele sibe ngenye (5–10%) ukuze kuvumeleke ukuphela kwezinhloko zokugcina phakathi kwezikhathi zokugcina, futhi ukuvikela ukugcina okungafanele. Umgca wokuqonda kaMüller noSchmidt (2021) ubonisa ukuthi ukusebenzisa isikhathi sokugcina se-30 kHz ne-7% sokusebenza kuzoba nezinhloko zemithambo yokuqala zokuphatha kungenani kuka-0.3%. Ukuphika kwe-15% sokusebenza kwenza ukuphatha kwezinhloko kubhekise kahle. Ngakho-ke, ukuxhuma ukubaluleka okuphezulu nokusebenza okuncane kuyisibonelo esiqinisekisiwe sokuthuthukisa isikhathi sokusebenza kwemithambo yokuqala ngokusebenzisa izinkulungwane eziningi zezinto ezingenakwazi ukuthi zihlambekile—njengokusebenzisa isikhathi sokugcina se-stainless steel esingena kakhulu noma tungsten carbide—ngaphandle kokucimba ukusiza kwezinhloko zokugcina.

Amadilika Okuqondisa Nezindlela Zokusebenza Zokuphatha Umkhakha Ngokwesibonelo Sokugcina Isibonele Nokulawula Ukubiliwe

Ukukhetha umdilika okuhle kuyisisekelo sokugcina isibonele sokuphatha, ukususa izinto ezingavumelekile, nokulawula ukubiliwe Umthombo wesibhakabhaka wesichasene ngeEDM . Kwi-EDM yekhable (WEDM), amanzi angavunyelwe ngokupheleleyo ayisebenza kakhulu ngoba yinamandla okugcina ukuthi amanzi ayilungile kakhulu (>1 MΩ·cm) nokuthi iyakwakha izithembiso zokuhlisa—kukhomba ukuthi kufanele kube nesikhundla esingaphansi kuka-±0.003 mm kwezindlela ezinkulu njengezindlela zezinyawo zemoto. Kwi-EDM yokubeka isikhumba, amafutha ayesibhakabhaka ne-kerosene ayasebenzisa kakhulu xa kusebenziswa isithelo sokubeka isikhumba kwezinto ezincane nezinto ezingavunyelwe ngokupheleleyo, ngoba zihlala ziyabeka isikhumba sokubeka isikhumba futhi ziyabeka ubuhle bokuphatha kwesikhumba. Izindlela ezintsha ezenziwa ngokuzalwa kwempilo—njengefutha le-sunflower eyenziwa ngokupheleleyo—zibonisa ukuthi zisemthethweni kwezinto eziphambili, ziyabika ukuthi kufanele kube nesikhundla sokubeka isikhumba (MRR) sokusha kuka-0.570 mm³/min futhi ubuhle bokuphatha kwesikhumba kungaba ngapansi kuka-Ra 1.012 µm, ngoba yinamandla yokugcina ukuthi amanzi ayilungile kakhulu futhi inamandla okuhlisa okulinganayo. Ukuthi amanzi ayisiphephelo kuyisibonelo esibalulekile: amanzi angasiphephelo ayakhuthaza ukuthi amasimbi ayadlula kwezikhundla ezincane (njenge-EDM yemikhono), kodwa amanzi angasiphephelo akhulu ayathatha isibonelo sokuthi amasimbi ayadlula kwezikhundla ezincane futhi ayathatha isibonelo sokuthi amasimbi ayadlula kwezikhundla ezincane. Ukuthuthukisa kwendlela—njengezindlela eziningi zokubeka isikhumba kwi-WEDM futhi ukuthuthukisa kwesikhundla kwi-EDM yokubeka isikhumba—kuyabeka ubuhle bokuphatha kwesikhumba kusukela kuka-~1.2 µm ku-0.4 µm. Ukuthuthukisa kwesikhundla kanye nokuthi amanzi ayisiphephelo ayisibonelo esibalulekile kuyabeka ukuthi amanzi ayisiphephelo ayisibonelo esibalulekile kusukela kuka-EDM yemikhono futhi ukuthi amanzi ayisiphephelo ayisibonelo esibalulekile kusukela kuka-EDM yokubeka isikhumba—kuyabeka ukuthi amanzi ayisiphephelo ayisibonelo esibalulekile kusukela kuka-EDM yemikhono futhi ukuthi amanzi ayisiphephelo ayisibonelo esibalulekile kusukela kuka-EDM yokubeka isikhumba.

Isikhombisi Sokuqala

Izinto zezindlela zokusebenza zokuphatha kwe-EDM zingaphi?

Ukuthenga kwemithambo, ukungathengi kwemithambo, ukuthenga kwemithambo yokuqhubeka kwezimilo, nokuphakama kwemithambo kuzo zizindlela ezibalulekile ekuthintana nokuphatha kwezindlela zokusebenza, ukususa kwemithambo, nokubaluleka kwesikhundla sokugcina ngokwemachining yase-EDM.

Ukuthi isikhundla sokusebenza kwe-electrode sithintana njani nokusebenza kwe-EDM?

Ukukhetha isikhundla sokusebenza—njenge-graphite, copper, noma brass—kuthintana nokusuka kwemachining, ukuthinta kwemithambo, isikhundla sokugcina, nokuthinta kwemachining yokuqhubeka.

Ukuthi izilwane zokuphatha kwe-dielectric zinjani ekusebenzeni kwe-EDM?

Izilwane zokuphatha kwe-dielectric ziyasinda ukuphatha kwezindlela zokusebenza, ukususa kwemithambo, nokuhlisa, okuyithintana ngqo nokucacisa kwemachining nokubaluleka kwesikhundla sokugcina. Izinketho zivela ku-deionized water, hydrocarbon oils, nokuthuthukiswa kwezilwane zokuphatha ezingaphansi kwezinye njenge-sunflower oil.

Sizingakanani izindlela zokusebenza kwe-EDM ukusiza emithambo eyodwa?

Izinqambu zokuthi njengoba isikhathi sokubeka isithunzi, umkhawulo wokuphakama, ubude bokuphakama, nokuphakama kwezinkulungwane kufanele kubhekwe ngokulinganiswe ngezinkinga zokugcina nezinkinga zokugcina kwezinto ukuze kubalanciswe umkhawulo wokususa izinto nokugcina isibonelo sesandla.