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SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
Brass Fittings: Sand-Cast on a Core, Then Tapped
Photograph taken by Glenn McKechnie (Wikimedia Commons) · CC BY-SA 2.0
Forge

Imeundwa na

Forge

14. Oktoba 2026NO
19
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Brass Fittings: Sand-Cast on a Core, Then Tapped

Couplings, elbows, tees and nipples for pipes are cast in brass around a sand core that forms the bore, then threaded. Turn a wooden pattern with core prints at the ends, bake oil-bonded sand cores, cast in green sand, and tap or die-cut the threads. The picture: a wooden core box with its sand cores (left), and the pattern with the finished casting (right).
Juu
Two days

Maagizo

1

Turn the patterns

Turn a wooden pattern of each fitting a little oversize for shrinkage and machining, with a stub, the core print, at each open end. Make a split wooden core box for the bore.

Vifaa kwa hatua hii:

Ubao wa Mti MgumuUbao wa Mti Mgumu1 kipande

Zana zinazohitajika:

Kerezo cha mbaoKerezo cha mbao
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
2

Make and bake the cores

Mix sand with a little linseed oil and flour, pack it into the core box, scrape it level and bake the cores in an oven at 200–250 °C until hard.

Vifaa kwa hatua hii:

Mchanga wa kusubuMchanga wa kusubu2 kg
Mafuta ya KitaniMafuta ya Kitani0.1 lita
UngaUnga0.1 kg

Zana zinazohitajika:

OveniOveni
3

Mould and pour

Ram the pattern in green sand in the flask as in the sand casting blueprint. Lift the pattern, set the cores in the prints left by the core prints, close the flask and pour the brass, melted outdoors in a crucible in the charcoal forge.
4

Knock out and fettle

When cool, break out the sand and the cores, saw off runner and riser and file the castings clean.

Vifaa kwa hatua hii:

Kitofali cha shaba nyeupeKitofali cha shaba nyeupe1 kg
MkaaMkaa1 as required

Zana zinazohitajika:

Kasha la kuumbia (juu na chini)Kasha la kuumbia (juu na chini)
Fua ya mhunziFua ya mhunzi
Kaure ya Udongo Mgumu wa MotoKaure ya Udongo Mgumu wa Moto
Koleo la kaure ya kuyeyushiaKoleo la kaure ya kuyeyushia
Msumeno wa chumaMsumeno wa chuma
Tupa ya chumaTupa ya chuma
Aproni ya NgoziAproni ya Ngozi
Glavu za kulehemuGlavu za kulehemu
Miwani ya usalamaMiwani ya usalama
5

Thread them

Hold each fitting in the vise and cut inside threads with the tap, outside threads with the die, using a little oil. Check them on a pipe.

Zana zinazohitajika:

Kibano cha meza ya kaziKibano cha meza ya kazi
Seti ya kukata nyuzi za skrubuSeti ya kukata nyuzi za skrubu
Kipima-unene cha dijitali cha inchi 6Kipima-unene cha dijitali cha inchi 6
6

Metal for a fitting

Inapakia daftari la Jupyter…
7

Limits

Cores and core prints as Wikipedia describes them; the oil-and-flour binder and the sizes are ours. Melt brass outdoors: it gives off white zinc-oxide smoke.

Vifaa

6

Zana Zinazohitajika

14

Mchoro huu unatengeneza

Thumbnail
Kishikilia nafasi

Viungio vya shaba-njano

Free

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Sand Casting

Sand Casting

na ForgeNO

UJANJA

47
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Brass Sheet, Strip and Rod from an Ingot

Brass Sheet, Strip and Rod from an Ingot

na ForgeNO

Uchimbaji chuma

33
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0
0
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CC0 Umma Wote

Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.

Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.

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