Ukukhiqizwa kwe-Die kudinga ukuthembela ku-punch (cindezela) ukuhlinzeka ngamandla, usayizi ohlukile wokufa, uhlobo lwesakhiwo kudingeka lukhethe i-punch ehlukile ukuze ifane. Ukukhetha okunengqondo kwe-punch kunganciphisa izindleko futhi konge izinsizakusebenza.
Izinga eliyinhloko le-punch yokukhetha ukufa lilinganiswa nge-tonnage, evame ukutholakala ngenani lamandla angenalutho, amandla okwenza amandla, amandla okucindezela namandla okuphungula. Okuyinhloko ngamandla angenalutho.
Amandla we-blanking awalungiswa, futhi ushintsho lwawo enqubweni yokugxivizwa lumi ngale ndlela elandelayo: lapho isibhakela siqala ukuxhumana nomkhiqizo wokugxiviza, amandla okuvala isikhala ahlala esesimweni esandayo. Lapho i-punch ingena cishe ku-1/3 wobukhulu bezinto ezibonakalayo, amandla we-blanking afinyelela inani eliphakeme. Ngemuva kwalokho, ngenxa yokubonakala kwendawo yokwephuka kwempahla, amandla azoncipha kancane kancane. Ngakho-ke, ukubalwa kwamandla we-blanking ukubala amandla amakhulu wokuvala.

Ukubalwa kwamandla angenalutho
Ifomula yokubala yamandla ajwayelekile okuvala: P = L * t * KS kg
Qaphela: P ngamandla adingekayo ukuze kungabi nalutho, ngo-kg
L ingqikithi yomjikelezo wentaba womkhiqizo ovalekayo, ngo-mm
T ubukhulu bezinto, ngo-mm
I-KS amandla okushefa kwento, ngo-kg / mm 2
Ngokuvamile, lapho umkhiqizo ongenalutho wenziwe ngensimbi emnene, inani elithile lamandla entambo yokugunda limi ngokulandelayo: KS = 35kg / mm2
Isibonelo:
Ake sithi ubukhulu bezinto u-t = 1.2, impahla iyipuleti lensimbi elithambile, futhi umkhiqizo udinga ukushaya ipuleti elingunxande elinokuma okungu-500mmx700mm. Uyini amandla wokuvala?
Impendulo: ngokwendlela yokubala: P = l × t × KS
L = (500 + 700) × 2 = 2400
t = 1.2, Ks = 35Kg / mm²
Ngakho-ke, P = 2400 × 1.2 × 35 = 100800kg = 100t
Lapho ukhetha i-tonnage, i-30% kufanele ingezwe ngaphambi kwesikhathi. Ngakho-ke, i-tonnage icishe ibe ngamathani ayi-130.