Tlhahlobo ea Thepa ea 'Mele ea Lipoleiti tsa Cemented Carbide

Lipoleiti tsa carbide tse entsoeng ka samente, tse entsoeng ka likarolo tse thata tsa carbide (tse kang tungsten carbide) le li-binders tsa tšepe (hangata cobalt), li sebelisoa haholo ho machining, merafong le boenjiniere ka lebaka la thepa ea bona e ntle ea 'mele. Tlhahlobo e qaqileng ea thepa ea bona ea bohlokoa ea 'mele e bohlokoa bakeng sa ho utloisisa boholo ba ts'ebeliso ea bona le melemo ea ts'ebetso.

1. Ho teteana

Density ke thepa ea mantlha ea lipoleiti tsa carbide tse samente, hangata ho tloha ho 12.0 ho isa ho 15.0 g/cm³. Boima bona bo phahameng haholo-holo bo bakoa ke boima bo phahameng ba athomo ea tungsten ka tungsten carbide (karolo e kholo). Boima bo phahameng bo etsa hore lipoleiti li be le botsitso bo botle - ha li na tšekamelo ea ho fetoha tlas'a matla a ka ntle kapa liphetoho tsa mocheso, e leng ntho ea bohlokoa bakeng sa lisebelisoa tse nepahetseng tsa machining tse hlokang taolo e tiileng ea boholo. Ho feta moo, boima bo phahameng bo ntlafatsa ho hanyetsa ha lipoleiti ho isa bohōleng bo itseng, kaha sebopeho se teteaneng se ka monya le ho hasanya matla a matla a kantle.

2. Thata le Wear Resistance

Ho thatafala ke e 'ngoe ea lintho tse hlahelletseng ka ho fetisisa tsa lipoleiti tsa carbide tse entsoeng ka samente. Ho thatafala ha tsona ha Vickers ka kakaretso ho feta 1500 HV, e phahame haholo ho feta ea tšepe ea lebelo le holimo le lisebelisoa tse ling tse tloaelehileng. Ho thatafala hona ho phahameng ho bakoa ke mekhahlelo e thata ea carbide, e etsang sebopeho se thata sa skeleton. Ho amana haufi-ufi le ho thatafala ke ho hanyetsa - boima bo phahameng bo bolela hore lipoleiti li ka hanela ho phunya, ho senya le ho khomarela thepa nakong ea tšebeliso. Ka mohlala, ka ho itšeha ka tšepe, lipoleiti tsa carbide tse entsoeng ka samente li boloka likarolo tse bohale ka nako e telele ntle le ho khathatsoa ke lisebelisoa tsa workpiece, haholo-holo ho lelefatsa bophelo ba tšebeletso ea lisebelisoa. Leha ho le joalo, ho thatafala ha lipoleiti ho ka fetoloa ka ho fetola litaba tsa tšepe ea tšepe: ho eketsa dikahare tsa cobalt ho fokotsa ho thatafala hanyenyane empa ho ntlafatsa ho tiea, ha ho fokotseha ha cobalt ho matlafatsa ho thatafala le ho apara ho hanyetsa.

3. Matla le Thata

Le hoja lipoleiti tsa carbide tse entsoeng ka samente li thata haholo, matla a tsona le ho tiea ha tsona le tsona ke matšoao a bohlokoa a tshebetso e sebetsang. Matla a bona a transverse rupture power (TRS) hangata a tloha ho 1500 ho isa ho 3000 MPa, e ba nolofalletsang ho mamella matla a holimo nakong ea ts'ebetso ea mochini kapa ea merafo. Toughness, e bolelang bokhoni ba ho hanela fracture tlas'a tšusumetso, haholo-holo e khethoa ke tšepe ea tšepe. Cobalt binder e etsa karolo ea ductile pakeng tsa lijo-thollo tse thata tsa carbide, ho thibela mapetsong ho ata ka potlako ha poleiti e tlas'a tšusumetso. Tekanyo ena ea matla a phahameng le boima bo itekanetseng bo qoba bothata ba ho brittleness bo otlang lisebelisoa tse ling tse thata ka ho fetisisa, ho etsa lipoleiti tsa carbide tse entsoeng ka samente tse loketseng maemo a mabeli a boima le a nang le tšusumetso.

4. Coefficient ea Katoloso ea Thermal le Thermal Conductivity

Mocheso oa katoloso ea lipoleiti tsa carbide tse entsoeng ka samente e batla e le tlaase, hangata pakeng tsa 5×10⁻⁶/°C le 7×10⁻⁶/°C. Katoloso ena e tlase ea mocheso e etsa bonnete ba hore lipoleiti ha li fumane liphetoho tse kholo tsa boholo ha li pepesehetse ho fetoha ha mocheso (mohlala, nakong ea ho itšeha ka lebelo le phahameng, moo khohlano e hlahisang mocheso). Botsitso bona bo bohlokoa bakeng sa ho boloka ho nepahala ha mochini, kaha ho fetoha ha mocheso ho ka lebisa ho kheloha ha litekanyo tsa lisebelisoa tsa mosebetsi. Mabapi le conductivity ea mocheso, lipoleiti tsa carbide tse entsoeng ka samente li na le mocheso o itekanetseng oa mocheso (100-150 W / (m·K)), o ba lumellang ho fetisetsa mocheso o hlahisitsoeng ka potlako ho sesebelisoa sa sesebelisoa kapa tsamaiso ea ho pholisa. Bokhoni bona ba ho felisa mocheso bo thibela ho futhumala ha libaka, ho ka nolofatsang karolo ea binder le ho fokotsa ho thatafala ha lipoleiti le ho itšoarela.

Ka bokhutšoanyane, thepa ea 'mele ea lipoleiti tsa carbide tse entsoeng ka samente-bophahamo bo phahameng, boima bo babatsehang le ho hanyetsa ho apara, matla a leka-lekaneng le ho tiea, le ts'ebetso e tsitsitseng ea mocheso-ka kopanelo ho khetholla ts'ebetso ea bona e phahameng ka ho fetisisa lits'ebetsong tse sa tšoaneng tsa indasteri. Ho utloisisa thepa ena ho thusa ho ntlafatsa khetho le tšebeliso ea lipoleiti tsa carbide tse entsoeng ka samente, ho eketsa boleng ba tsona bo sebetsang.