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Perforated Screen Plate: Clear- or Buhr-Punched Steel Plate (Richards, Ore Dressing, 1903)
The punched steel screens of ore mills: round holes or slots punched through steel plate, either 'clear punched' with a sharp square-edged tool that cuts out a wad, or 'buhr punched' with a thicker tool that tears the metal over a socket in the die.
Clear punching suits holes of 0.03 inch and up; buhr punching suits fine holes of 0.02 inch and less, because a thicker plate can be used. Holes in rows at 60° give 1.154 times the open area of rows at 90°.
Unknown: the plate thickness and hole spacing for a given screen.
Source: R. H. Richards, Ore Dressing vol. I (1903), pp. 167-168. Picture: p. 167 with Figs. 117 and 118.
Kati
Unknown
Maagizo
1
1
Choose the holes
Choose the holes
For coarse work use round holes of 0.04 inch (1 mm) and up; for medium work about 0.03 inch (0.75 mm), clear punched. For fine work, 0.02 inch (0.5 mm) and less, buhr punch, so a thicker plate can be used. The smallest practical clear-punched hole is about 0.014 inch (0.35 mm) wide: a hole much narrower than the plate is thick breaks the punch (the extreme Richards found was a slot 54 per cent of the thickness).
Vifaa kwa hatua hii:
Bati la chuma1 steel plate
Vipimo visivyojulikana1 kipandeZana zinazohitajika:
Mkandamizo wa kutoboa2
2
Lay out the holes
Lay out the holes
Set round holes in rows at 60° or 90°; with the same hole and spacing, 60° rows give 1.154 times the open area. Punch slots vertical, diagonal or horizontal, in line or staggered; staggering spreads the punching strain.
Zana zinazohitajika:
Mkandamizo wa kutoboa3
3
Punch the plate
Punch the plate
Clear punching: a tool with a square, sharp edge cuts out a wad exactly the size and shape of the hole. Buhr punching: a thicker tool presses the plate, lying on a socket in the die, just deep enough to tear the metal apart.
Zana zinazohitajika:
Mkandamizo wa kutoboaVifaa
2- 1 steel plateKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
Mchoro huu unatengeneza
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.