Near-net-shape casting ha se theknoloji e arohaneng - ke filosofi ea moralo le tlhahiso e sebelisang mokhoa o nepahetseng oa ho etsa matsete ho hlahisa likarolo tse haufi le litekanyo tsa ho qetela kamoo ho ka khonehang, ho fokotsa machining a CNC libakeng tse bohlokoa feela. Sephetho: 40–60% nako ea ho sebetsa e fokotsehile, 30–50% e fokotsa litšila tsa thepa, le kakaretso ea litšenyehelo tsa phokotso ea beng e ka fetolang moruo oa karolo.
"Near-net-shape" e bolela ho lahla ho hlokang machining a fokolang ho fihlela litekanyo tsa ho qetela. Ha ho etsoa matsete, sena se bolela:
Bapisa sena le ho lahla lehlabathe, moo machining stock ea 2-5mm e tloaelehileng, 'me hoo e batlang e le karolo e' ngoe le e 'ngoe e sebetsang e hloka machining. Kapa ho machining ho tloha billet, moo 40-60% ea thepa e tala e fetohang lichifi.
Bareki ba bangata ba OEM ba tsepamisitse maikutlo ho theko ea likotoana ntle le ho nahana ka litšenyehelo tsohle tsa botho (TCO). TCO e kenyelletsa:
Ha litšenyehelo tsena li lekanyelitsoe, lipolokelo tse tsoang ho matsete a haufi-ufi-nete e ba tse qobellang.
Thuto-pale : Moetsi oa li-valve ea hlahisang 'mele oa li-valve tse 5,000 selemo le selemo o bapisa lehlabathe + machining e felletseng khahlanong le invest casting + machining a fokolang:
| Litšenyehelo Element | Tsela ea ho Lahlela Lehlabathe | Tsetelo ea ho Lahlela Matsete | Poloko |
|---|---|---|---|
| Theko ea ho lahlela | $18.00 | $28.00 | $10.00 |
| Theko ea lintho tse bonahalang (ho kenyeletsoa le likhahla) | $6,50 | $3.20 | + $3.30 |
| Litšenyehelo tsa mochini oa CNC | $22.00 | $9.50 | + $12,50 |
| Tooling amortization | $0.80 | $1.20 | $0.40 |
| Litšenyehelo tsa ho hlahloba | $3.50 | $1.80 | + $1,70 |
| Kakaretso ka sengoathoana | $50.80 | $43.70 | +$7.10 (14%) |
Theko ea ho lahla matsete e ne e le $ 10 e phahameng, empa litšenyehelo tse felletseng ka sengoathoana li ne li le tlase ho $ 7.10 - phokotso ea 14% TCO e tsamaisoang haholo ke nako e fokolitsoeng ea machining le litšila tsa thepa.
Mekhoa e mengata ea tekheniki ea ho etsa matsete e thusa tlhahiso e haufi-ufi:
1. Precision Wax Ente : Mechini ea sejoale-joale ea ente ea boka e nang le taolo ea mocheso e koalehileng e hlahisa lipaterone tse nang le ho nepahala ha dimensional tsa ± 0.05mm. Ha ho nepahala hona ho fetisetsoa ka khetla ea ceramic ho ea ho lahla, sephetho ke litekanyo tsa as-cast tseo hangata li leng ka har'a 0.2mm ea litlhoko tsa ho qetela.
2. Ceramic Shell Technology : Lisebelisoa tse tsoetseng pele tsa likhetla tsa ceramic tse sebelisang lijase tsa mantlha tsa phofo ea zircon le li-backup layers tsa silica tse kopantsoeng li hlahisa libaka tsa ho lahlela ka Ra 1.6–3.2 µm - e boreleli ka ho lekaneng bakeng sa lisebelisoa tse ngata tse sa tiiseng ntle le mochine.
3. Ho Kopana ho Laoloang : Khetla ea ceramic casting ea Investment e fana ka mocheso o ts'oanang oa mocheso, ho hlahisa li-castings tse nang le ho sotha ho fokolang le botenya bo tsitsitseng ba marako. Bokhoni bona bo lumella lienjiniere ho hlakisa setoko sa machining sa 0.5-1.0mm feela, ha se bapisoa le 2-5mm bakeng sa ho etsa lehlabathe.
4. 3D Printed Wax Patterns : Bakeng sa li-geometries tse rarahaneng kapa tlhahiso ea boleng bo tlaase, mekhoa ea boka e hatisitsoeng ea 3D e felisa matsete a lisebelisoa ha ho ntse ho boloka ho nepahala ho hlokahalang bakeng sa liphetho tse haufi-ufi. Liphetoho tsa moralo li ka etsoa le ho lekoa ka mor'a matsatsi a 7-10.
5. Ntlafatso ea Tlhahiso bakeng sa Tlhahiso (DFM) : Baenjiniere ba nang le phihlelo ba nang le phihlelo ba atisa ho fetola likarolo hore li khone ho ba litekanyo tse haufi le ho qetela, ho felisa ts'ebetso ea mochine ka ho feletseng. Mohlala, mookameli oa khoele ea neng a entsoe sephara pele a ntan'o phunngoa / a tapuoa hangata a ka lahleloa le mookameli ea seng a hlophisitsoe ea hlokang ts'ebetso ea khoele feela.
Senotlolo sa ho holisa melemo e haufi-ufi-nete ke khetho ea leano ea hore na mochini o sebetsa joang:
Mochini o Loketseng (mabaka a bohlokoa a sebetsang):
E ka Tloha E le-Cast (libaka tseo e seng tsa bohlokoa):
Mokhoa ona oa ho khetha o ka fokotsa palo ea ts'ebetso ea CNC ka 40-60% ha e bapisoa le machining a felletseng a ho lahla lehlabathe.
Ho fana ka matsete a haufi-ufi ho fana ka poloko e kholo ka ho fetisisa ka thepa e turang kapa e thata ho e etsa mochini:
Stainless Steel (304, 316, 17-4 PH) : Ho sebetsa tšepe e sa hloekang ho na le 2-3 × butle ho feta carbon steel, 'me ho roala lisebelisoa ho potlakisa. Ho fokotsa thepa ea machining ho tloha ho 3mm ho isa ho 1mm ho ka boloka metsotso e 15-20 ka karolo e 'ngoe le e' ngoe holim'a 'mele oa li-valve tse sa hloekang.
Hadfield Manganese Steel (ZGMn13) : Thepa ena e thatafatsang mosebetsi e ba thata le ho feta ha o e etsa mochini, e etsa hore ho seha ho tebileng ho be thata haholo. Ho lahlela ka sebopeho se haufi-ufi ho batla ho tlamehile bakeng sa likarolo tse rarahaneng tsa tšepe tsa manganese joalo ka li-crusher liners.
Aluminium Alloys (A356) : Le hoja mechine ea aluminium e bonolo, theko ea thepa e phahame ho feta tšepe. Ho fokotsa litšila tsa thepa ho tloha ho 50% (billet machining) ho isa ho 10% (ho kenya chelete) ho fana ka chelete e ngata ea ho boloka litšenyehelo likarolong tse kholoanyane.
Li-Superalloys tse thehiloeng ho Nickel : Ho $ 50-100 / kg, ho fokotsa litšila tsa machining ka ho lahlela haufi le marang-rang ho bohlokoa bakeng sa tlhahiso ea moruo ea likarolo tse phahameng tsa mocheso.
Ho fumana liphetho tsa sebopeho se haufi-ufi ho hloka tšebelisano lipakeng tsa sehlopha sa meralo ea OEM le mofani oa thepa:
Kenyeletso ea Bafani ba Pele : Kopana le mofani oa thepa ea hau nakong ea moralo, eseng ka mor'a hore litšoantšo li phetheloe. Maikutlo a DFM mothating ona a ka tseba menyetla ea ho felisa ts'ebetso ea mochini.
Tlhahlobo ea Mamello : Hlahloba hore na ke mamello efe e hlileng e leng ea bohlokoa libakeng tse kang-cast. Litšoantšo tse ngata li totobatsa mamello e tiileng holim'a libaka tse sa sebetseng "feela haeba ho ka etsahala" - ho lokolla tsena ho ka felisa machining.
Netefatso ea Prototype : Sebelisa li-prototype tsa 3D tse hatisitsoeng tsa boka ho netefatsa litekanyo tsa sebopeho se haufi-ufi pele u itlama ho lisebelisoa tsa tlhahiso. Potoloho ena ea matsatsi a 7-10 e lumella ntlafatso e potlakileng ea moralo.
Lithuto tsa Bokhoni : Kopa data ea Cpk ka litekanyo tsa bohlokoa tsa ho lahlela. Ts'ebetso e nang le bokhoni ba ho lahla (Cpk ≥ 1.33) e ka u lumella ho tlosa machining holim'a libaka tseo u li sebelisang hona joale "bakeng sa polokeho."
Kakaretso ea Mekhoa ea Litšenyehelo : Kamehla hlahloba likhetho tsa ho lahlela u sebelisa kakaretso ea litšenyehelo tsa ho ba beng - eseng feela theko ea likotoana. Theko e phahameng ea matsete hangata e feta ho fokotsoa ke ho boloka chelete ka machining.
Mehleng ea litšenyehelo tse ntseng li eketseha tsa thepa, khaello ea machinist e nang le boiphihlelo, le khatello ea ho fokotsa nako ea ho ea 'marakeng, ho fana ka matsete a haufi le marang-rang ho fana ka tsela e netefalitsoeng ea ho theola litšenyehelo tsohle tsa beng. Ka ho fokotsa nako ea machining ka 40-60%, litšila tsa thepa ka 30-50%, le litšenyehelo tsa ho hlahloba ka 40%, mokhoa ona o ka fana ka 10-20% ea chelete eohle ea ho boloka litšenyehelo likarolong tsa tšepe tse nepahetseng.
Ho Ningbo Ruican, boiphihlelo ba rona ba lilemo tse 17+ ba ho etsa matsete, bo kopantsoeng le mochini o kopaneng oa CNC le litsamaiso tsa boleng tsa IATF 16949, li re etsa balekane ba loketseng bakeng sa mananeo a likarolo tse haufi-ufi. Sehlopha sa rona sa boenjiniere sa DFM se sebetsa le baqapi ba OEM ho tloha mohopolong ho isa tlhahisong, ho ntlafatsa meralo bakeng sa melemo e mengata e haufi-ufi.
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