Investment Casting Tolerances Inotsanangurwa: CT Grades & Dimensional Precision Guide

Sei Kushivirira Mutauro Kunokosha Mukukanda

Zvitoro zvemachining zvinotaura maererano nemagiredhi eIT (ISO 286) - kushivirira kwakayerwa mumazana emamirimita, kunowanikwa nekubvisa zvinhu zvine maturusi akaomarara, anorongwa. MaFoundries vanotaura mutauro wakasiyana. Zvikamu zvakakandwa zvinoumbwa nesimbi yemvura inoomesa mukati me mold, uye kusiyanisa kwavo mativi kunotongwa newakisi pateni kurongeka, kuwedzera kwegomba, alloy shrinkage, uye chikamu geometry.

Chiyero chepasi rose chekukanda kushivirira ndeye ISO 8062 , iyo inotsanangura nhevedzano ye "Casting Tolerance" mamakisi - CT mamakisi . Iyo yakaderera iyo CT nhamba, iyo yakasimba kushivirira. Kunzwisisa kuti chikamu chako chinowira papi pachiyero ichi ndicho hwaro hwesarudzo yega yega yekutenga.

Iyo CT Giredhi Sisitimu paKutarisa

Magiredhi eCT anopa bhendi rekutsungirira zvichienderana nechiyero chezita chechinhu. Iyo yakafanana CT giredhi inobvumira yakafara absolute bhendi pane yakakura dimension pane diki. Sechirevo chinoshanda chesimbi uye iron investment castings:

• CT4-CT5 - iyo inoshanda yakanakisa kesi yekukanda madiki ekudyara (kazhinji pasi pe ~ 50 mm) mune silica sol process.
• CT5-CT6 - iyo yakajairwa kutengeserana renji kune yakawanda silica sol investisiti castings kusvika ~ 200 mm
• CT6-CT8 - yakajairika kune yemvura girazi process castings uye yakakura, yakanyanya kuoma geometries
• CT8-CT12 - iyo nharaunda yekukanda jecha uye kufa kukanda nepamusoro dhizaini uye yekuparadzanisa-mutsara musiyano

Kuenzanisa, chiyero che 100 mm pasi pemagiredhi akasiyana chinopa mufananidzo wakaoma: CT4 inobvumira inenge ± 0.26 mm, CT5 inenge ± 0.36 mm, CT6 inenge ± 0.5 mm, uye CT9 - inonzwisisika yekukanda jecha - inenge ± 1.5 mm. Ichi ndicho chikonzero sarudzo yemaitiro yega, isati yaitwa chero machining, ichikutengera iwe maviri- kusvika mana-yakapetwa kuvandudza mune as-cast chaiyo.

Chii Chaizvo Chinotyaira Kushivirira mu Investment Casting

Zvinhu zvina zvinotonga kuti chikamu chako chinogara kupi pachiyero cheCT:

1. Wax pateni kurongeka. Yese dimesheni yekukanda inogara nhaka yekururama kwepatani yewakisi yakaiumba. Majekiseni ewakisi emazuva ano ane aruminiyamu anofa anoita mapatani kusvika kumazana mashoma emamirimita, asi kupera kwewakisi, tembiricha yekufa, uye kudzvanywa kwejekiseni zvese zvinosiyana zvishoma pakati pemapfuti. Iyi ndiyo yekutanga - uye yakakura - inopa mutsindo wekukanda, uye ndosaka kugona kwedimensional kusinga patsanurwe kubva pamhando yezvishandiso zvemhando.

2. Shell nesimbi maitiro. Iyo ceramic goko rinowedzera zvishoma panguva yekupfura, uye yega yega alloy inodonha pakusimba - kabhoni simbi inosvika 2%, simbi isina simbi 2.5-3%. Shrinkage haina kunyatso yunifomu: inopesvedzerwa nekuchinja kwechikamu, nzvimbo yekukanda, uye kuti mainjiniya ekutanga anodya sei. Zvikamu zvakaomarara zvine shanduko yechikamu nekukurumidza hazvizodzikire zvakafanana munzira dzese, uye vane hunyanzvi vanogadzira vanotsiva izvi pateni kufa.

3. Chikamu geometry. Yakareba zvikamu zvitete zvinogona kukanganisa panguva yekubvisa goko kana kupisa kupisa; zvikamu zvine maficha akapatsanurwa zvakanyanya anounganidza pateni uye magoko akasiyana mukati menguva. Chimiro 400 mm kure nedatum hachizombobata bhendi rakafanana serimwe 40 mm kure - kwete nekuti iyo yekutanga haina hanya, asi nekuti kukanganisa kunowedzera kure.

4. Nzira yekugadzira. Magoko egirazi emvura akachipa asi akadzikama zvishoma pane silica sol shells. Kana dhirowa rako richidaidza CT5 pabhodhi, urikutsanangura silica sol - uye mutengo unoratidza. Kana CT7 iri yechokwadi yakakwana kune zvisiri-akakosha maficha, girazi remvura rinogona kuhwina quote.

As-Cast vs Machined: Iyo Sarudzo Inochengetedza Yakanyanya Mari

Chiitwa chimwechete chakanyanya kukosha mukukanda kutenga ndechekurongedza zvese zviri padhirowa kuita mabhakiti matatu:

Bucket 1 - As-cast yakanaka. Nzvimbo dzisiri-kushanda, maficha ekuchenesa, zvizorwa profiles. Kutsanangura CT6 se-kukanda pano zvakakwana zvakakwana. Machining aya maficha imarara akachena.

Bucket 2 - As-cast nebhendi rinodzorwa. Zvimiro zvinosangana nezvikamu zvakapfava, zvinotsvaga zvisina tsarukano, kana kutakura zvisimbiso zvingada zvirinani pane zvakajairwa se-kukanda kugona. MaFoundries anogona kuomesa mabhendi aya neakazvitsaurira pateni kudzora, geji-yakavakirwa sampling, uye yakasarudzika machining edatum preps - pasina yakazara machining.

Bucket 3 - Inofanirwa kugadzirwa. Kutakura zvibhorani, H8/H7 inokwana, maburi akarukwa, zviso zvegasket, magiya anokwira. Hapana nzira yekukanda inopa IT7 zvakananga; Aya maficha anowana machining allowance ye1.5-3 mm uye anopedzwa paCNC.

Dhirowa iyo gumbeze-inotsanangura ± 0.05 mm kwese kunomanikidza muvambi kuti atore machining akazara epasi pese. Dhirowa inoratidzwa nebucket zvine hungwaru inogaro chengetedza 20-40% yezvinyorwa zvemachining. Kana isu tichiongorora madhirowa kuNingbo Ruican, ichi bhaketi chiitwa ndiko kukosha kwekutanga kwatinowedzera - simbi isati yadirwa.

Kudzikama, Kururama, uye Mamwe Mafoni eGeometric

CT mamakisi anovhara saizi kushivirira, asi kushivirira kwejometri - kupfava, kutwasanuka, chinzvimbo - vanotevera pfungwa dzavo. Yakajairika as-cast kugona kwe 150 mm simbi yekukanda mari inotenderedza 0.5-1.0 mm kufuratirwa. Kana chiso chekuisa chisimbiso chichida 0.05 mm flatness, ndiko kushanda kwekugadzira, kumira kwakazara. Kushivirira kwenzvimbo pamaitiro egomba rakakandwa kunoenderana nekuti maburi anokandwa here kana kuti akaboorwa: maburi ekukanda anotevera kurongeka kwezvishandiso (zvinenge ± 0.3–0.8 mm chinzvimbo pamasaizi ari pakati nepakati), nepo mapatani akadhirowa achitora nhaka yeCNC chaiyo (± 0.05 mm kana zvirinani). Kutsanangudza mashevedzero akasimba pamaburi ekukanda-mukati ndeimwe yeanonyanya kudzivirirwa - kushivirira pamusoro-zvatinoona.

Maitiro ekuverenga iyo Foundry's Tolerance Claim

Kana mutengesi achiti "tinobata CT5," bvunza mibvunzo mitatu:

1. Pahukuru hupi? CT5 pa 25 mm yakasiyana zvikuru ne CT5 pa 300 mm. Kumbira bhendi rekushivirira pane ako chaiwo akakosha zviyero.
2. Pamaitiro api? Silica sol kana girazi remvura? Mutengo wequotation unokuudza, asi kudhirowa hakufanirwe kufungidzira.
3. Neiko kugona data? Inowanikwa inoteedzera mibairo paCMM uye inogona kutora Cpk kukosha pane zvakakosha maficha mutengesi akasiyana kubva kune imwe inotora zita rekugona matafura. Nezvekuchengetedza-akakosha kana serial kugadzira zvikamu, kumbira kugona kudzidza pazvinyorwa zvekutanga.

A Inoshanda Kushivirira Rondedzero Yenyu Inotevera RFQ

• Taura iyo default se-cast CT giredhi yechikamu (CT5 kana CT6 yesilica sol yakajairika), wobva wapfuura chete panodiwa.
• Maka nzvimbo dzakagadzirwa nemashini zvakajeka uye tsanangura iyo datum system - machinists anoda anodzokororwa akakandwa madhamu ekushanda kubva.
• Chengetedza nhamba yezviyero zvakakosha zvishoma. Gumi zvechokwadi akakosha maficha ane Cpk yekutevera inorova makumi mana zvakasununguka "zvakakosha" izvo.
• Ipa muvambi basa rechikamu. Kuziva kuti chibhorani chinotakura gwenzi kunoita kuti tifungidzire musanganiswa wakakodzera wekukanda kutonga uye mwenje machining pass.
• Bvunza zvinyorwa zvekutanga-dimensional marepoti ane chaiwo akayerwa kukosha, kwete kungopasa/kufoira.

The Bottom Line

Kukandira kwekudyara kunoburitsa seku-cast chaiyo iyo inobvisa akawanda machining - asi chete kana iyo dhirowa ichibvumira. Vatengi vanonzwisisa CT mamakisi, bhaketi maficha avo pakati pese-cast uye muchina, uye vanokurukura zvinoshanda zvinodikanwa pachena neiyo yekutanga vanoramba vachiwana zvikamu zvinokwana, pamitengo inorova ese ari maviri makina zvikamu uye zvishoma chaizvo kukanda maitiro.

KuNingbo Ruican, tinogadzira silica sol uye mvura magirazi ekudyara magirazi ane-mumba CNC kupera, uye isu tinoongorora yega dhizaini yekushivirira optimization tisati tatora - sevhisi inosanganisirwa neRFQ yako. Titumire chikamu chako chekudhirowa uye tikuratidze kuti ndeapi maficha atinogona kuendesa se-cast, uye chii chinokuponesa.

Unoda kuongororwa kwekushivirira pane chikamu chiripo? Bata timu yedu yeinjiniya kuburikidza ne www.kstcasting.com.