Nke a na-ejikarị emeputa ihe bụ ike nke usoro ntinye akwụkwọ, dị ka Brinell hardness, Rockwell hardness, Vickers hardness na micro hardness.Uru ike siri ike enwetara na-anọchi anya nguzogide elu igwe na nrụrụ plastik kpatara ntinye nke ihe mba ọzọ.
Ihe na-esonụ bụ mmalite dị mkpirikpi nke nkeji hardness dị iche iche:
1. Brinell hardness (HB)
Pịa bọọlụ nchara siri ike nke otu nha (na-abụkarị 10mm na dayameta) n'ime elu nke ihe na ibu ụfọdụ (n'ozuzu 3000kg) ma debe ya ruo oge ụfọdụ.Mgbe ewepụrụ ibu ahụ, oke ibu ahụ na mpaghara ntinye bụ uru Brinell hardness (HB), na kilogram ike / mm2 (N/mm2).
2. Rockwell hardness (HR)
Mgbe HB> 450 ma ọ bụ ihe nlele ahụ pere mpe, enweghị ike iji nnwale siri ike nke Brinell wee were nha Rockwell hardness kama.Ọ na-eji cone diamond nwere akụkụ vertex nke 120 ° ma ọ bụ bọọlụ nchara nke nwere dayameta nke 1.59mm na 3.18mm iji tinye n'elu ihe a ga-anwale n'okpuru ụfọdụ ibu, na ike nke ihe na-enweta site na. omimi nke indentation.Dị ka ihe siri ike nke ihe nlele ahụ si dị, enwere ike igosipụta ya na nha atọ dị iche iche:
HRA: Ọ bụ ike nke enwetara site n'iji ibu 60kg na diamond cone indenter, a na-ejikwa ya maka ihe ndị nwere oke siri ike (dị ka carbide cimented, wdg).
HRB: Ọ bụ ike nke enwetara site na iji ibu 100kg na bọọlụ ígwè siri ike nke nwere dayameta nke 1.58mm.A na-eji ya eme ihe ndị nwere ike dị ala (dị ka ígwè annealed, nkedo ígwè, wdg).
HRC: Ọ bụ ike nke enwetara site na iji 150kg ibu na diamond cone indenter, a na-ejikwa ya maka ihe ndị nwere isi ike dị elu (dị ka ígwè siri ike, wdg).
3 Vickers hardness (HV)
Jiri diamond square cone indenter na ibu nke na-erughị 120kg na a vertex n'akuku nke 136 ° ka pịa n'ime ihe n'elu ihe, na kewaa n'elu ebe nke ihe ntinye olulu site na ibu uru, nke bụ Vickers hardness HV uru ( kgf/mm2).
E jiri ya tụnyere Brinell na Rockwell ule siri ike, Vickers hardness test nwere ọtụtụ uru.Ọ dịghị enwe ihe mgbochi nke kpọmkwem ọnọdụ nke ibu P na indenter dayameta D dị ka Brinell, na nsogbu nke deformation nke indenter;ọ nweghịkwa nsogbu na uru siri ike nke Rockwell enweghị ike ijikọ ọnụ.Ọ nwekwara ike nwalee ihe ọ bụla dị nro na nke siri ike dị ka Rockwell, ọ nwekwara ike ịnwale ike nke akụkụ dị oke mkpa (ma ọ bụ nke dị gịrịgịrị) karịa Rockwell, nke nwere ike ime naanị Rockwell elu hardness.Mana ọbụlagodi n'ọnọdụ ndị dị otú ahụ, enwere ike iji ya tụnyere n'ime oke Rockwell, enweghịkwa ike ijikọ ya na ọkwa isi ike ndị ọzọ.Na mgbakwunye, n'ihi na Rockwell na-eji omimi indentation dị ka nha nha, na omimi ntinye na-adịkarị obere karịa obosara ntinye, ya mere njehie ikwu ya dịkwa ukwuu.Ya mere, Rockwell hardness data adịghị eguzosi ike dị ka Brinell na Vickers, na n'ezie ọ bụghị dị ka kwụsiri ike dị ka Vickers kpọmkwem.
Enwere ụfọdụ mmekọrịta ntughari n'etiti Brinell, Rockwell na Vickers, ma enwere tebụl mmekọrịta mgbanwe nke enwere ike ịjụ.
Oge nzipu: Mar-16-2023
