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Cold WorkingIn terms of material processing, Cold Working means a way to transform a material at a relatively low temperature. In other words, it is not a way of cutting or melting a material to pour it into a molding frame with the use of compression press, but a way to make a shape of a material with the uses of printing or other methods. (E.g.: Cans and trays belong to such cold working method)
Hot WorkingIn terms of material processing, Hot Working means a way to transform a shape of a material at a relatively high temperature through the stress of the pushing of force in a proper direction. The method requires relatively less force than the Cold Working method, but moulding machine should endure the high temperature of a material.
ForgingIt is a mechanical method to hit or press a solid metal material with a hammer, and is used to transform the material into a certain shape. The temperature for hitting is sometimes the normal temperature, but materials with a high melting point are often heated. On the basis of the temperature at which a material is in progress of recrystallization, forging at more than the temperature is called hot forging, and forging at lower than the temperature is called cold forging.
Precise molding (Lost Waxing=Investment Molding)Precise molding (Lost Waxing=Investment Molding) A molding way to make materials filled around a wax mold and heat them, and then pour wax in the mold = Investment Molding. The molding cost is expensive, but it is possible to acquire castings with complicated shapes and high measures.