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Hacksaw: Bent and Flattened Frame, Bi-Metal Blade
A hacksaw is a C-shaped frame holding a narrow blade under tension from a screw. In a 1936 patented frame, each upright is made from a piece of wire rod, bent to shape and then pressed, rolled or hammered flat, with its end flattened at right angles to carry the blade, and the uprights are held in a channel-section top member. Bi-metal blades, patented in 1976, start as a metal block with a central strip of cutting tool steel; it is rolled flat into a sheet, the sheet is divided into two blades whose edges are the tool steel, the teeth are cut in that edge, and the blades are hardened by heating, quenching and tempering. The teeth are given a wavy set.
Abantado
Factory process
Mga Tagubilin
1
1
Bend and flatten the uprights
Bend and flatten the uprights
Bend a piece of wire rod to the upright's shape, then press, roll or hammer its horizontal part and most of its upright part flat; flatten the end at right angles to take the blade.
Mga materyales para sa hakbang na ito:
Rolyo ng wire rod na asero1 as requiredMga kailangang kasangkapan:
Bumabagsak na martilyo na may forging die2
2
Assemble the frame
Assemble the frame
Fit the uprights into the channel-section top member and fit the tensioning screw.
Mga materyales para sa hakbang na ito:
Tirang asero na hugis-channel1 piraso
Turnilyong panghigpit na may wing nut1 piraso3
3
Make the blade stock
Make the blade stock
Roll a block with a central strip of tool steel flat into a sheet, and divide it into two blades with the tool steel along one edge.
Mga materyales para sa hakbang na ito:
Bilog na barang high-speed steel1 as required
Tirang carbon steel1 as requiredMga kailangang kasangkapan:
Makinang panipis ng metal4
4
Cut and harden the teeth
Cut and harden the teeth
Cut the teeth in the tool-steel edge, set them in a wave, and harden the blades by heating, quenching and tempering.
Mga kailangang kasangkapan:
Makinang panggupit ng ngipin ng lagari
Pugon sa pagpapatigas at pag-temple ng tiraMga Materyales
5- 1 as requiredPlaceholder
- 1 pirasoPlaceholder
- Placeholder
- 1 as requiredPlaceholder
- 1 as requiredPlaceholder
Mga Kinakailangang Kasangkapan
4- Placeholder
- Placeholder
- Placeholder
- Placeholder
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