Koj hnov 'Inconel 718' thiab tam sim ntawd xav tias 'cov khoom tawv rau cov ntu kub' - dav hlau cav qhov chaw, turbine discs, yam ntawd. Qhov ntawd yog qhov tseeb, tab sis nws kuj yog qhov chaw pib qhov kev poob qis. Cov neeg pom qhov siab tensile thiab creep tooj ntawm 700 ° C thiab xav tias nws tsuas yog ib qho nyuaj version ntawm 316 stainless. Tsis yog. Qhov kev sib tw tiag tiag tsis yog nws lub zog xwb; nws yog li cas lub zog ntawd coj tus cwj pwm thaum koj tab tom sim ua ib yam dab tsi tawm ntawm nws. Cov machining thiab tom qab ua tiav zaj dab neeg yog qhov kev paub tiag tiag tau sau.
Machining Grind - Lus
Wb tham txog cov cuab yeej txiav. Thaum ntxov, peb tau kawm txog txoj kev nyuaj uas kho nws zoo li cov hlau kub kub yog ib txoj hauv kev nrawm rau kev puas tsuaj thiab cov khoom seem. Kev ua haujlwm hnyav hnyav heev. Yog tias koj lub cuab yeej tsis ntse, lossis yog tias koj nyob txawm me ntsis, koj tsis txiav ntxiv lawm - koj ua haujlwm txias rau saum npoo rau qee yam nyuaj dua. Peb kub hnyiab los ntawm ob peb hom ntawm coated carbides ua ntej nyob rau hauv ib tug heev tshwj xeeb qib nrog ib tug ntse, polished ntug geometry. Txawm li cas los xij, koj tab tom saib kev nrawm tej zaum 20% ntawm qhov koj yuav khiav ntawm cov hlau. Nws yog ib qho qeeb, kim tshem tawm cov txheej txheem, thiab coolant tsis xaiv; Nws yog ib qho tseem ceeb ntawm kev tswj cov cua sov los tiv thaiv lub workpiece nws tus kheej kom tsis txhob kub dhau thiab ua rau cov tawv tawv hnyav dua.
Kuv nco qab ib pawg ntawm lub cev valve peb machined los ntawm ib 718 bar khoom. Cov ntawv luam tau hu ua qhov zoo ntawm qhov kawg ntawm qee qhov bores sab hauv. Peb tau txais qhov ntev zoo meej, tab sis qhov tiav yog grainy, yuav luag torn. Qhov teeb meem? Tool deflection. Txawm tias muaj kev teeb tsa nruj, cov txiav quab yuam tau siab txaus los ua kom muaj kev sib tham me ntsis. Peb yuav tsum rov qab mus, rov tsim kho cov cuab yeej txoj hauv kev kom ua tiav qhov sib dua, thiab hloov mus rau qhov tshwj xeeb wiper ntxig. Nws ntxiv cov xuab moos rau lub sijhawm voj voog, tab sis nws yog qhov ntawd lossis ib feem uas yuav tsis raug kaw zoo. Qhov ntawd yog tus nqi zais - lub sijhawm engineering thiab cov txheej txheem tweaking uas tsis tshwm sim hauv tus nqi raw khoom ib kilo.
Drilling thiab tapping yog lawv tus kheej tshwj xeeb ntuj raug txim. Chip khiav tawm yog huab tais. Cov stringy, tawv chips yuav qhwv ib ncig ntawm lub laum thiab snap nws tawm hauv lub plawv dhia yog tias koj tsis aggressively pecking thiab siv high-pressure coolant los ntawm lub cuab tam. Rau cov xov, peb yuav luag ib txwm hais kom muab kauv-flute kais dej thiab cov kais dej loj loj. Sim txiav 50% xov hauv ib 718 yog thov kom tawg kais faus tob rau hauv ib qho kim heev. Koj kawm muab chav rau khoom.
Casting Complexities – Tsis yog ib tug Pour thiab mus
Tsiv los ntawm machining mus ua qhov ze-net zoo los ntawm peev casting - uas yog peb qhov kev ua si tseem ceeb ntawm Qingdao Qiangsenyuan Technology Co., Ltd. (QSY). Nrog ntau tshaj peb xyoo caum nyob rau hauv plhaub thiab peev casting, peb tau khiav ntau nickel alloys los ntawm lub foundry. ib 718 yog ib qho tseem ceeb, tab sis ib qho xav tau. Lub alloy siab melting point yog ib yam; tswj nws cov solidification kom tsis txhob freckles, segregation, thiab kub tearing yog lwm ballgame nkaus.
Lub rooj vag thiab nce kev tsim qauv rau 718 yog qhov tseem ceeb tshaj rau ntau cov hlau. Koj xav tau heev directional solidification pub lub loj shrinkage kom zoo. Yog tias cov thermal gradients tsis ncaj ncees lawm, koj xaus nrog micro-porosity nyob rau hauv cov seem tuab los yog cov kua muag nto ze ze ntawm nyias-rau-thick hloov. Peb tau muaj cov khoom tawm los ntawm lub plhaub saib zoo meej, tsuas yog rau X-ray lossis UT kom pom cov huab ntawm cov porosity zoo hauv lub hub. Qhov ntawd yog qhov poob tag nrho. Nws yuam kom ua tiav kev tshuaj xyuas ntawm peb qhov ntsuas kub thiab pwm ua ntej cua sov raws tu qauv rau qhov tshwj xeeb geometry. Qee lub sij hawm, qhov kho yog counter-intuitive - me ntsis qis superheat tuaj yeem txo qhov kev kub ntxhov thiab txhim kho suab nrov, txawm tias koj ua haujlwm ze rau cov hlau nplaum.
Tom qab ntawd muaj cov qauv zoo li-cam khwb cia. Koj siv tsis tau nws li-yog. Lub hauv paus dendritic qauv thiab tej zaum yuav muaj Laves theem (nrawm intermetallic nplua nuj nyob rau hauv niobium) txhais tau hais tias ib feem tsis zoo txhua yam khoom ncaj qha tawm ntawm cov pwm. Qhov no yog lub ntsiab lus tseem ceeb uas ntau tus neeg yuav khoom tsis nco: qhov cam khwb cia 718 tsuas yog ib nrab tiav. Nws kiag li yuav tsum tau mus los ntawm kev kho cua sov homogenization - ntev so, feem ntau saum 1100 ° C - kom yaj cov theem teeb meem rov qab rau hauv matrix. Hla qhov no, thiab ib feem yuav ua tsis tiav ntxov thaum muaj kev ntxhov siab, txawm tias qhov zoo li cas los xij.
Kev kho cua sov seev cev - Nws yog txhua yam hais txog qhov sib lawv liag
Qhov no yog lub plawv ntawm kev txais ib 718 ua. Cov txheej txheem kev laus (720 ° C rau 8 xuab moos, qhov cub txias rau 620 ° C, tuav rau 8 teev, cua txias) yog cov ntaub ntawv zoo. Tab sis cov kab ke txheeb ze rau lwm cov haujlwm yog txhua yam. Rau ib qho machined los ntawm wrought Tshuag, koj feem ntau tshuab nws nyob rau hauv lub annealed (softer) mob, ces nws muaj hnub nyoog. Suab hais ncaj.
Tab sis rau ib feem, nws yog complex. Raws li tau hais, koj homogenize ua ntej. Tom qab ntawd, koj tuaj yeem ua qhov kub isostatic nias (HIP) lub voj voog kom kaw txhua qhov seem micro-porosity. Cov lus nug tseem ceeb yog: Koj puas HIP ua ntej lossis tom qab kev kho mob? Muaj kev sib cav. Peb tau ua ob txoj kev. HIPping tom qab kev kho cua sov sub-solvus tuaj yeem ua tau zoo, tab sis koj yuav tsum tau ceev faj heev nrog kub kom tsis txhob muaj qoob loo loj hlob. Peb tam sim no feem ntau nyiam HIP nyob rau hauv lub as-cam khwb cia + homogenized mob, ces mus rau tag nrho cov kev kho cua sov ib theem zuj zus. Nws ntxiv tus nqi, tab sis cov ntaub ntawv qhia tau hais tias zoo dua thiab zoo ib yam ntawm kev qaug zog, uas feem ntau yog qhov tseem ceeb spec rau rotating qhov chaw.
Ib qho ntxiv nuance: kev ntxhov siab. Yog tias koj tab tom ua haujlwm tseem ceeb tom qab kev laus (uas koj sim zam, tab sis qee zaum ua tsis tau), koj xav tau kev kub ntxhov siab tom qab ntawd. Koj tsis tuaj yeem mus siab lossis koj yuav dhau hnub nyoog cov khoom siv. Nws yog qhov sib npaug ntawm qhov ruaj khov thiab khaws cia gamma ob-prime precipitates uas muab 718 nws lub zog.
Vuam thiab Kho - Ua nrog ceev faj heev
Qee lub sij hawm ib qho casting muaj qhov tsis xws luag uas koj xav tias koj tuaj yeem kho tau, lossis ib feem ntawm lub tshuab xav tau kev sib tsoo. Nrog 718, qhov no yog kev ua haujlwm siab. Cov hlau yog nquag ua rau lub hnub nyoog tawg nyob rau hauv qhov chaw muaj kev kub ntxhov (HAZ) tom qab vuam, tshwj xeeb tshaj yog tias nws nyob hauv qhov muaj hnub nyoog. Lub vuam thermal voj voog qhia txog kev ntxhov siab, thiab kev kho kev laus tom qab (yog tias siv) tuaj yeem ua rau tawg vim HAZ sim rov ua dua.
Tus txheej txheem kev xyaum yog weld nyob rau hauv lub annealed mob, ces muab tag nrho cov sib dhos los ntawm tag nrho cov hnub nyoog-hardening voj voog. Tab sis txawm li ntawd los, kev vam meej tsis tau lav. Peb tau sim kho lub tsev loj turbine ob peb xyoos dhau los. Ua raws li phau ntawv: pre-weld anneal, siv ERNiFeCr-2 muab tub lim (yeem 718 muaj pes tsawg leeg), tswj kev sib tshuam kub. Nws ntsia zoo meej tom qab vuam. Tom qab lub voj voog kev laus, txawm li cas los xij, dye penetrant tshuaj xyuas tau nthuav tawm lub network ntawm cov kab nrib pleb zoo hauv HAZ. Ib feem yog junk. Qhov kev txiav txim siab yog tias qhov loj ntawm cov casting tsim xws li kev nruj heev uas cov residual stresses los ntawm vuam tsuas yog siab dhau lawm, txawm tias tom qab lub hnub nyoog tag nrho. Tam sim no, peb txoj cai yog kom tsis txhob vuam muaj hnub nyoog 718 thaum twg tib neeg ua tau. Tus nqi ntawm kev ua tsis tiav yog siab dhau. Yog tias tus qauv tsim yuav tsum tau vuam, nws yog qhov zoo dua los siv ntau qhov sib txawv xws li 625 rau qhov tshwj xeeb hauv kev sib dhos.
Sourcing thiab Real-World Supply Chain
Tsis yog tag nrho ib 718 yog tsim sib npaug. Cov ntawv tshwj xeeb los ntawm cov mills sib txawv lossis cov chaw tsim khoom tuaj yeem hais tias lawv ntsib AMS 5662 lossis 5663, tab sis dab ntxwg nyoog nyob rau hauv kev xyaum yaj. VIM-VAR (Nqus Induction Melt ua raws li Nqus Arc Remelt) cov khoom siv yog tus qauv kub rau aerospace rotating qhov chaw vim nws txo qis kev suav nrog thiab muab cov qauv zoo, cov qauv zoo. Rau ntau cov khoom pov tseg zoo li qub, ib qho VIM yaj tuaj yeem txaus, tab sis koj yuav tsum paub txog qhov tseem ceeb ntawm daim ntawv thov.
Qhov no yog qhov uas tus khub tswj cov txheej txheem tseem ceeb. Ntawm QSY, peb tsom rau kev nqis peev casting thiab CNC machining rau cov ntaub ntawv zoo li no txhais tau tias peb tsis yog yuav zeb Tshuag xwb; peb nyob nraum tswj cov chemistry los ntawm cov yaj nyob rau hauv peb tus kheej foundry rau castings, los yog nruj me ntsis certification peb bar stock suppliers. Koj tsim ib qho kev xav uas cov ntawv qhia yaj qhia tias muaj cua sov huv. Koj nrhiav tsis muaj leej faj, tswj qib ntawm magnesium lossis cerium rau sulfide zoo tswj. Nws yog cov ntsiab lus tsis zoo nkauj no uas txiav txim siab seb ib pawg ntawm cov khoom puas yuav dhau los ntawm kev tshuaj xyuas ultrasonic lossis muaj ib qho tsis ua tiav hauv qhov kev sim siab-kawg.
Thaum kawg, muaj qhov tseeb ntawm kev lag luam. 718 yog kim. Cov ntsiab lus niobium pom rau qhov ntawd. Yog li txhua tus qauv siv nws yuav tsum muaj kev ncaj ncees los ntawm qhov xav tau tiag tiag rau nws 650 ° C + lub zog thiab corrosion kuj. Peb feem ntau sab laj nrog cov neeg siv khoom ntawm theem tsim. Qee lub sij hawm, hloov mus rau Alloy 625 kom zoo dua weldability lossis corrosion kuj, lossis txawm tias qib high-qib stainless rau kev siv kub qis, tuaj yeem txuag tau tus nqi tseem ceeb thiab tsim kev mob taub hau yam tsis muaj kev cuam tshuam rau kev ua haujlwm. Lub cim ntawm kev paub tsis yog tsuas yog paub ua haujlwm nrog ib 718; nws paub thaum koj xav tau tiag tiag.
