Cold drawn tubes yog tsim los ntawm cov qib qis thiab muaj ntau cov kev ua tau zoo thiab cov yam ntxwv zoo. Cov hlab ntim coj los siv tau rau hauv kev tsim kho ntawm ntau lub tsev. Qhov tseem ceeb tshaj plaws ntawm cov hlab ntaws xim yog tias qhov nyuaj yog qhov loj, qhov nyuaj yog loj, thiab lawv ua si hauv cov hauj lwm ntau. . Txij li cov kev lag luam thiab cov lag luam ntawm cov hlab ntaws xim muaj feem tseem ceeb, kev siv cov hlab nta txias kuj yog ntau dua. Dab tsi yog qhov nyuaj ntawm ib hom khov dej txias?
Ntawm lawv, feem ntau siv cov kev ntsuas txias rau extraneous tube hardness xeem feem ntau A, B, C, uas yog HRA, HRB, HRC. Kev ntsuas tus nqi yog suav nrog cov qauv nram qab no: Thaum kuaj A thiab C nplai, HR = 100-e Thaum kuaj B nplai, HR = 130-e Qhov twg e-qhov qis qis ntawm qhov ntxiv, chav tsev ntawm 0.002mm txhais tau hais tias thaum lub qhov chaw nkag tawm ntawm qhov chaw tawm los ntawm ib chav tsev (0.002mm), nws zoo ib yam li Rockwell hardness. Qhov ntau dua tus nqi ntawm e, qhov txo cov hardness ntawm cov hlau, thiab qhov siab zog qhov nyuaj. Tus tau txais daim ntawv thov ntawm qhov saum toj no peb teev raws li nram no: HRA (diamond conical indenter) 20-88 HRC (diamond conical indenter) 20-70 HRB (diameter 1.588mm steel pob indenter) 20-100 Rockwell hardness test yog tam sim no siv dav Txoj kev, hauv HRC yog siv hauv cov yeeb nkab qauv, tsuas yog tsis zoo rau Brinell hardness HB. Rockwell hardness tuaj yeem siv rau qhov kev txiav txim ntawm ib qho chaw muag khoom nyuaj heev rau cov khoom siv hlau nyuaj, nws ua rau Brookfield txoj kev tsis yog, tshaj li Brookfield txoj kev, nyeem tau cov nqi ntawm qhov nyuaj ntawm lub xov tooj ntawm lub tshuab hardness. Txawm li cas los xij, vim tias nws txoj kev me me, qhov kev ua tsis muaj nuj nqi tsis zoo li Brookfield tus qauv. C. Vickers Hardness (HV) Lub Vickers hardness test kuj yog ib txoj kev ntsuas kev qis hauv ib qho kev sib tw hauv lub hauv paus plaub hau uas muaj qhov sib npaug ntawm sab nraud ntawm 1360 yog raug xa mus rau qhov kev xeem nto nrog xaiv lub hom phiaj (F). Qhov kev quab yuam tau raug tshem tawm tom qab lub sij hawm tuav tswj tuav, thiab qhov ntev ntawm ob lub kab pheeb ces kaum ntawm qhov indentation yog ntsuas. Vickers hardness value yog tus quotient ntawm qhov kev xeem sib zog muab faib los ntawm qhov cheeb tsam ntawm qhov indentation, thiab nws cov nqi xam nrog yog: Qhov twg: HV - Vickers hardness cim, N / mm2 (MPa); F - sim quab yuam, N; d - Qhov nruab nrab nruab nrab ntawm ob lub kab pheeb ces kaum ntawm qhov indentation, hli. Tus Vickers hardness test force F yog 5 (49.03), 10 (98.07), 20 (196.1), 30 (294.2), 50 (490.3), 100 (980.7) Kgf (N), etc. Qhov ntau yog 5 mus rau 1000 HV . Ib qho piv txwv ntawm txoj kev qhia: 640 HV 30/20 txhais tias Vickers hardness value measured nrog 30 Hgf (294.2 N) rau 20 vib nas this (vib nas this) yog 640 N / mm 2 (MPa). Lub Vickers hardness method yuav siv los txiav txim siab heev nyias cov ntaub ntawv thiab txheej txheej hardness. Nws muaj qhov zoo tshaj plaws ntawm Brinell thiab Rockwell, thiab ua rau lawv cov lus tsis txaus, tab sis nws tsis yoojyim li Rockwell txoj kev. Vickers tsis tshua siv nyob hauv cov yeeb nkab qauv. HB yog kev siv qee qhov quab yuam rau lub taub (2.5,5,10) pob nias tiv thaiv lub npoo ntawm cov khoom yuav tsum tau ntsuas, thiab tom qab ntawd ntsuas cov kab uas hla ntawm qhov hlau pob nto los txiav txim qhov nyuaj ntawm khoom. Qhov tseem ceeb ntawm cov khoom siv thiab kev ntiv taw, ua rau lub cev ntim qis los yog kub hnyiab ntawm lub raj ntim txias yog feem ntau siv HB. HR muaj peb hom A, B thiab C3
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