In the forging process, die forgings mainly refer to forgings with dies. In the process of operation, dies are used to forge complex forgings with high precision requirements. The characteristics of die forgings should be free forgings. Free forgings basically have no dies, and can only forge extremely simple things such as shafts and rings. Die forging can forge many structural products, control the dimensional tolerance of products and reduce the processing capacity of vehicles.

Forging is a kind of forging, and the influence of forging process on the fiber direction of forging; Location of mechanical performance test bar; Marking, steel grade position, etc. Qualified forgings must also meet the following requirements: according to the forging process specification, all dimensions should meet the requirements of the forging drawing, and must meet the technical requirements of heat treatment hardness, dislocation size, burr size, bending degree, wall thickness difference, surface defects, etc., and the requirements of scale removal and mechanical properties.

Three special factors of die forgings

1. The forging compressor has a ejector pin device, which can be used to forge forgings with long rods (that is, the axis of the rod is consistent with the moving direction of the slider), so as to reduce the peripheral boundary of the forgings on the parting surface and reduce the consumption of raw metal.

2. The average allowance of die forgings on the forging press is 30~50% smaller than that on the hammer, and the specific figures can be determined by consulting relevant manuals;

3. If the forging is taken out of the die groove, the inclination of the die forging is the same as that of the forging on the hammer. When the forgings are ejected by ejector pins, the inclination of the die forgings can be significantly reduced, but it can't completely disappear, otherwise the ejector pin load is too large.

The die used in die forging is called die forging. From the beginning of metal deformation to the final formation, the corresponding die of forging die is adopted. The forging die is divided into an upper forging die and a lower forging die, which are respectively installed on the hammer head and the chopping block. With the help of dovetail and keyway, the forging die is prevented from falling off, loosening and moving laterally from left to right. The key block and wedge iron are fastened in the dovetail groove of the hammer head and the dovetail groove of the chopping block to prevent the forging die from moving longitudinally back and forth. The deflection direction of the upper and lower dies of the hammer wedge is different. The small head of the key block is located in the keyway of the forged dovetail, and the big head is located in the dovetail groove of the hammer head or die holder.

What are the types of aluminum alloy forging processing?

Forging generally belongs to volume forming, through the transfer and distribution of metal volume, the blank of machine parts or parts close to size is obtained. Forged products are called forging. Forging is mainly carried out under heating. Metal materials can be forged to obtain the required shape and size, its internal structure can be significantly improved, and its service performance can be improved. Therefore, all kinds of parts or components with heavy load and complex load are generally produced by forging method.

Forging is usually divided into free forging and die forging.

Free forging is generally used in free forging equipment, which uses simple tools to forge metal ingots or blocks into specific shapes and sizes. Free forging is mainly used for single piece and small batch production. With the increase of batch demand, the tools used are gradually complicated, resulting in tire die forging. The forging workshops of various mechanical repair shops mainly adopt the methods of free forging and tire die forging. Large forgings (such as large steam turbine rotors, turbines, giant wheels, engine crankshafts, etc.) also need to be forged freely on large hydraulic presses.

Die forging is a forging method suitable for mass production of forgings. In die forging, a special cavity (die) with the same or similar forging shape is opened, a forging die is installed on the forging machine, a metal blank is placed in the forging die, and the blank is plastically deformed by forging, and the deformation flow is controlled by the die space. Die forging often introduces various volume forming methods to produce forgings, such as extrusion, roll forging, cross rolling, etc., which can be included in the category of die forging.

In addition to high productivity, die forging has the advantages of accurate forging shape and size, high material utilization rate, reasonable streamline distribution, long service life of parts and simple production operation.

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