Hot forming
  • Hot forming

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Hot forming

Hot forming

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


 
Cold Form
Warm Form
Hot Form
Temperature
Ambient
400-900 °F
1300-2000 °F
Die Pressure
High
Lower
Lowest
Stress
Residual
Medium
Minimal
Grain Flow
Good
Better
Best
Scaling
None
Less
More


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.
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Hot forming

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


 
Cold Form
Warm Form
Hot Form
Temperature
Ambient
400-900 °F
1300-2000 °F
Die Pressure
High
Lower
Lowest
Stress
Residual
Medium
Minimal
Grain Flow
Good
Better
Best
Scaling
None
Less
More


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.
Less
Read more