Open And Closed Die Forging

Based on the type of mold, or dies are used, forging operations are usually grouped into Open Die Forging and Closed Die Forging.

1. Open Die Forging, Forging Mold Open With, or without Prints

Open die forging forging is done by placing the workpiece on the die that is flat, or flat die or a simple form. This process is used for large-sized products with low productivity.

Open die forging is usually used to provide the initial shape of the workpiece to be followed by a closed die forging who use, or closed die forgings.

Some examples of open-die forgings are: upsetting, edging, fullering, drawing, swagging, piercing and punching.

Factory Establishment With Hot Forging Technology, Open Die Hot Forging Machine

2. Closed Die Forging, Forging With Closed Mold

Closed die forging is a forging operation that uses a pair of blocks that are precision die forming the desired workpiece. Die block was made by machining or casting. Die forging using this block will result in a product which has a more precise size tolerances. Die block consists of two parts, the upper die, and die bottom. Closed die forgings generally applied to relatively small-sized workpieces.

Closed die forgings applied gradually begins to process fullering and edging on the raw material to provide initial shape of the workpiece. Then do the rough with the rough forging die block. At this stage there is a change form relatively large. Final forging stage is done by finishing die to obtain a workpiece in accordance with the shape and size of the final product design.

In the forging process, the volume of the workpiece should be enough to be able to fill the entire cavity of the mold perfectly. The difficulty of determining the exact volume, the volume of the workpiece is often used relatively larger.

The advantages of this volume will cause the material flow that extends laterally outward from the die cavity and forming a thin metal ribbon commonly referred to as a fin or flash. To prevent excessive flash, or flash is too wide, the die block is provided cavity reservoir called flash gutter. After the last stage of forging, flash cut using a trimming die.

Flash serves as a safety valve cover or excess metal in the mold cavity is closed and in addition it serves as a barrier to the flow of the metal, causing a high pressure to make sure the metal will fill the mold cavity is empty.