How to Make Steel Bolts - Cold Forming
2025/9/8 view:
Cold forming, or cold heading, is a method of producing steel bolts without the use of heat. It is accomplished by striking or pressing the steel in a die to push it into the shape required, which can take multiple strikes.
Size & Shape
Cold forming has limitations in the size of bolts that it can manufacture. As bolt diameters increase, more pressure is needed to shape the material, which makes the equipment at larger scales unpractical. Further, while technology has enhanced the accomplishments of cold forming, some complex shapes are still challenging or impossible to achieve without heating or machining.
Waste
One of the principal advantages of cold forming is that it is material efficient. It shapes the material without heat or removal, reducing material and energy losses by a significant amount.
Strength
Cold forming increases the strength of bolts through a process called work hardening. The grain structure of the steel is not annihilated, and the grains flow around the contours of the part, which strengthens the part.
Material
Different metals and alloys respond differently to cold forming. For instance, alloy steel is adequately ductile for effective cold forming, and low carbon steel benefits from the strength addition provided by the process. However, certain materials like stainless steel may not be suitable for cold forming because the work hardening may inhibit material flow, and it may be impossible to achieve the desired shape.
Size & Shape
Cold forming has limitations in the size of bolts that it can manufacture. As bolt diameters increase, more pressure is needed to shape the material, which makes the equipment at larger scales unpractical. Further, while technology has enhanced the accomplishments of cold forming, some complex shapes are still challenging or impossible to achieve without heating or machining.
Waste
One of the principal advantages of cold forming is that it is material efficient. It shapes the material without heat or removal, reducing material and energy losses by a significant amount.
Strength
Cold forming increases the strength of bolts through a process called work hardening. The grain structure of the steel is not annihilated, and the grains flow around the contours of the part, which strengthens the part.
Material
Different metals and alloys respond differently to cold forming. For instance, alloy steel is adequately ductile for effective cold forming, and low carbon steel benefits from the strength addition provided by the process. However, certain materials like stainless steel may not be suitable for cold forming because the work hardening may inhibit material flow, and it may be impossible to achieve the desired shape.
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