Mechanical Testing Method for Cast Iron Brake Shoes Ssed in Rolling Stock (Khetho ea Brake Shoe ea Hardness Tester)

Khetho ea lisebelisoa tsa tlhahlobo ea mochini bakeng sa lieta tsa brake ea tšepe e tla lumellana le maemo a: ICS 45.060.20. Tekanyetso ena e bolela hore tlhahlobo ea thepa ea mochini e arotsoe likarolo tse peli:

Teko ea 1.Tensile

E tla etsoa ho latela lipehelo tsa ISO 6892-1:2019. Litekanyo le boleng ba ts'ebetso ea lisampole tsa tensile li tla fihlela litlhoko tsa ISO 185:2005.

2.Hardness Testing Method

E tla kenngoa ts'ebetsong ho latela ISO 6506-1:2014. Mehlala e thata e tla khaoloa ho tloha halofong e ka tlase ea bareng ea tlhahlobo e arohaneng; haeba ho se na teko ea teko, seeta se le seng sa brake se tla nkoa, 6mm - 10mm e tla aroloa ho tloha ka lehlakoreng la eona, 'me boima bo tla lekanyetsoa lintlheng tsa liteko tsa 4, ka karolelano ea bohlokoa e le sephetho sa teko.

Motheo oa Mokhoa oa ho Leka Bothata

Tekanyetso ea ISO 6506-1: 2014 "Lisebelisoa tsa Metallic - Teko ea Boima ba Brinell - Karolo ea 1: Mokhoa oa Teko" e totobatsa molao-motheo, matšoao le litlhaloso, lisebelisoa tsa tlhahlobo, mehlala, mekhoa ea liteko, ho se kholisehe ha sephetho le tlaleho ea liteko bakeng sa teko ea ho thatafala ha Brinell ea lisebelisoa tsa tšepe.

2.1 Khetho ea Lisebelisoa tsa Teko: Brinell Hardness Tester (E khothalelitsoe Pele)

Melemo: Sebaka sa indentation se seholo, se ka bonts'ang boima ba kakaretso ba lisebelisoa tsa tšepe tse entsoeng ka tšepe (tšepe e entsoeng ka tšepe e ka 'na ea e-ba le sebopeho se sa lekaneng),' me liphello li emela haholoanyane.

E loketse bakeng sa tšepe e entsoeng ka thata e mahareng le e tlaase (HB 80 - 450), e koahelang ka ho feletseng mefuta e thata ea lieta tsa brake tsa tšepe.

Ts'ebetso e batla e le bonolo, 'me tlhokahalo ea ho qeta bokaholimo ba mohlala e batla e le tlaase (ka kakaretso Ra 1.6 - 6.3μm e lekane).

2.2 Molao-motheo oa Teko ea Bothata ba Brinell

Molao-motheo o ka akaretsoa ka tsela e latelang: Bolo ea alloy e thata (kapa bolo ea tšepe e tingoeng) e bophara ba 10mm e hatelloa ka holim'a setšoantšo tlas'a matla a itseng a teko (joaloka 3000kgf). Kamora ho lekanya bophara ba indentation, boleng ba hardness (HBW) bo baloa ho bonts'a bokhoni ba thepa ea ho hanyetsa deformation ea polasetiki. Monyetla oa eona oa mantlha o teng ka boemeli bo matla ba liphetho, tse ka bonts'ang litšobotsi tsa boima ba macroscopic tsa thepa. Ke mokhoa oa khale o sebelisoang haholo tlhahlobong ea ts'ebetso ea lisebelisoa tsa tšepe.

2.3 Matšoao le Litlhaloso tsa Boleng ba Brinell Hardness

Tlhaloso ea mantlha ea boleng ba Brinell hardness (HBW) ke: karo-karolelano ea matla a teko (F) ho sebaka sa ho indentation (A), ka yuniti ea MPa (empa hangata yuniti ha e tšoauoa, 'me ho sebelisoa palo ea linomoro feela). Foromo ea lipalo ke e latelang:HBW=πD(D−D2−d2)2×0.102×F
Moo:

F ke matla a teko (yuniti: N);

D ke bophara ba indenter (yuniti: mm);

d ke bophara bo tloaelehileng ba ho indentation (yuniti: mm);

Coefficient "0.102" ke phetoho e sebelisoang ho fetolela yuniti ea matla a teko ho tloha ho kgf ho ea ho N (haeba e baloa ka kotloloho ho N, foromo e ka nolofalloa).

E ka bonoa ho tsoa ho foromo ea hore tlas'a matla a tšoanang a teko le bophara ba indenter, bophara bo nyane ba indentation, matla a thepa a matla a ho hanyetsa deformation ea polasetiki, 'me a phahame boleng ba boima ba Brinell; ka lehlakoreng le leng, e ka tlaase ho thata boima boleng.

Ho ea ka litšoaneleho tsa thepa ea lieta tsa brake iron brake (grey cast iron), litekanyetso tsa teko ea boima ba Brinell hangata li tjena:

Matla a teko (F): Ka kakaretso, ho sebelisoa 3000kgf (29.42kN), 'me letšoao le lumellanang la bothata ke "HBW 10/3000".

Tlhokomeliso: Haeba mohlala o le mosesaane kapa thepa e le bonolo, matla a teko a ka fetoloa (joaloka 1500kgf kapa 500kgf) ho latela ISO 6506-1:2014, empa sena se tla bontšoa tlalehong ea teko.