Hot Forming with Induction Heating
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Heating stainless steel rod for hot forming
Preheating Stainless Steel "J" Tape
Hot forming is a process in the manufacture of industrial fasteners such as bolts, screws and rivets. Heat is used to soften the metal which is usually a sheet, bar, tube or wire and then pressure is used to alter the shape of the metal by performing any of the following operations:
| Heading | Forming a head on a bolt, screw or rivet |
| Blanking | Cutting a whole piece from sheet metal |
| Punching | Cutting a hole |
| Slotting | Cutting of elongated holes |
| Perforating | Cutting of a group of holes |
| Trimming | Cutting away excess metal |
| Shearing | Cutting in straight line completely across piece |
| Bending | Producing single, double, straight flange, edge hem, curl or double hem bends |
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Variable
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Cold Form
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Warm Form
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Hot Form
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Temperature
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ambient
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400-900° F
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1300-2000° F
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Die Pressure
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high
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lower
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lowest
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Stress
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residual
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medium
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minimal
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Grain Flow
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good
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better
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best
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Scaling
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none
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less
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more
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Advantages
- springback effect is eliminated
- ductility is improved
- low pressure & minimal residual part stress
- better grain flow & microstructure
- improved mechanical properties
- reduced need for post production tempering & heat treating
- improved production rates with minimal defects
