Both hot forming and cold forming molds metal into another, final shape, but not every metal can be formed by either process. Here, we’ll dive deeper into the difference between hot forming and cold forming.
During cold forming, metal parts are shaped at room temperature. It may be heated by a few degrees, but in general, the metal can only be mildly heated. There are two ways that cold forming can be performed: a stamping method, and hydroforming method. In the stamping method, a sheet of metal is placed between a “male” and “female” die tool, and stamped into shape. With the hydroforming method, a wear pad and rubber diaphragm are pressed against the die inside of the forming chamber, saving time and money by reducing metal to metal contact.
During hot forming, metal heated in an environment similar to an oven, with a die inside. The furnace is heated up to 2,000 degrees in a process that can take up to an hour. The material is then placed in-between the male and female portions of the die, and the metal is pressed into its new shape. This method is ideal for small parts that cannot be cold-formed.
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