Complete the text:Forging is the process by which metal is heated and shaped by a compressive force using a hammer or a press. It is used to produce large quantities of identical parts, such as пустоmachine parts in the automobile industry. Cold forging is done at a low temperature using пустоsoft metals and plastic. Hot forging is done at a high temperature and makes metal easier to shape without breaking. In the past, forging was done by a blacksmith using a hammer. Nowadays industrial forging is done with пустоpresses powered by a machine.