Ungayikhetha njani inqindi elifanelekileyo lokunyathela iindawo

Imveliso yokufa kufuneka ixhomekeke kwipunch (cinezela) ukubonelela ngamandla, ubukhulu bokufa obahlukeneyo, uhlobo lwesakhiwo kufuneka lukhethe i-punch eyahlukileyo ukuze itshatise. Ukukhetha okufanelekileyo kwepunch kunokunciphisa iindleko kunye nokugcina izixhobo.
Owona mgangatho uphambili wokukhethwa kwenqindi lokufa ulinganiswa ngetoni, edla ngokufunyanwa sisixa sokungabikho kwamandla, ukwenza amandla, amandla okucinezela kunye nokuhlutha amandla. Eyona iphambili kukungasebenzi kwamandla.
Amandla angenanto awalungisekanga, kwaye utshintsho lwayo kwinkqubo yokunyathela ngolu hlobo lulandelayo: xa inqindi liqala ukunxibelelana nemveliso yokunyathela, amandla angenanto ahlala ekwimeko eyandayo. Xa i-punch ingena malunga ne-1/3 ubukhulu bezinto eziphathekayo, amandla angenanto afikelela kwixabiso eliphezulu. Ke, ngenxa yokubonakala kwendawo yokwaphuka kwezinto, amandla aya kuncipha ngokuthe ngcembe. Ke ngoko, ukubalwa kwamandla okungabinanto kukubala ubuninzi beyona nto ingabalulekanga.

Ukubalwa kwamandla angenanto
Ifomula yokubala yamandla aqhelekileyo angenanto: P = L * t * KS kg
Qaphela: P ngamandla afunekayo ukuze kungabikho nto, kwi-kg
L yindawo ejikeleze umjikelo wento engenanto kwimveliso, mm
T ubukhulu bezinto, kwi-mm
I-KS kukuqina kwe-shear kwezinto, kwi-kg / mm 2
Ngokubanzi, xa imveliso engenanto yenziwe ngentsimbi ethambileyo, ixabiso elithile lezinto zokucheba kwezi zinto zilandelayo: KS = 35kg / mm2
Umzekelo:
Masithi ubukhulu bezinto t = 1.2, imathiriyeli yipleyiti yentsimbi ethambileyo, kwaye imveliso ifuna ukubetha inqwanqwa lesitya elixande kunye nemilo ye-500mmx700mm. Yintoni amandla angenanto?
Impendulo: ngokwefomula yokubala: P = l × t × KS
L = (500 + 700) × 2 = 2400
t = 1.2, Ks = 35Kg / mm²
Ke ngoko, P = 2400 × 1.2 × 35 = 100800kg = 100t
Xa ukhetha iitoni, ama-30% kufuneka ongezwe kwangaphambili. Ngoko ke, iitoni zimalunga neetoni ezili-130.


Ixesha Post: Jan-18-2021