Brief introduction of die forging process and equi

Introduction to extrusion die casting die forging process and equipment technology and application

1 Extrusion die casting die forging process principle

extrusion die casting die forging is also called liquid die forging die casting or die casting die forging). This technology reflects the process of ordinary die casting (casting) mold filling + forging feeding. The extrusion die casting die forging equipment is essentially a continuous casting and continuous forging equipment, which is a continuous casting and continuous forging forming process equipment. In short, the filling step can be completed by the injection filling device of the existing die casting machine (low pressure casting machine), and the forging feeding step is completed by the power of the master cylinder (forging cylinder). Through the power of the master cylinder (forging cylinder), the forging pressure is applied to the full projection surface or the main projection surface of the part for solidification and feeding, so as to meet the feeding process requirements of thick and large parts

2. Characteristics of extrusion die casting die forging process

forging specific pressure (or forging feeding specific pressure) is a unique leading process parameter of extrusion die casting die forging. It refers to that the external force directly makes 10 in the solidification stage after the billet is filled The inner diameter of the burner is Φ 0.17mm is used for the absolute pressure of the slab, which is maintained until the slab solidifies. Forging specific pressure refers to the direct pressure acting on the solidification process (injection specific pressure refers to the pressure in the process of injection molding, which is an indirect pressure of liquid, and will fail to zero after the completion of molding)

extrusion die casting die forging must have die forming surface to participate in forging feeding

the extrusion die casting die forging process is finally characterized by forging, which can completely eliminate the shrinkage and surface defects caused by casting, such as aluminum alloy, and the surface finish can be as high as grade (ra1..8). The inside of the slab is broken grain and forged structure

the limit of forging feeding is forging, and the equipment must have the main device (forging head), main parameters and main functions of forging

3. Application scope of extrusion die casting die forging technology

the invention of extrusion die casting die forging technology has greatly expanded the application scope of traditional casting technology and equipment. On the one hand, as long as the metal can be melted, all regular fe18.93 metal materials (such as ZL203, ZL301, LY12, 6061, 6063, stainless steel, ferrous metal, etc.) can be produced by extrusion die casting die forging technology; On the other hand, including the traditional sand casting process with sand core filling, low pressure (differential pressure) casting can be applied to the generalized die casting process, which greatly improves labor productivity and process reliability

an extrusion die casting die forging machine is designed to be compatible with ordinary die casting, low pressure (differential pressure) casting, liquid die forging, continuous casting and continuous forging and semi-solid processing processes

if the equipment is filled with a low pressure of 1.4 MPa by the differential pressure casting process, the projected area of the parts produced is times that of the original, that is, how large the mold can be installed on the workbench of the existing equipment, and how large the parts can be filled; An extrusion die casting die forging machine with 8000kN mold locking force and 8000kN forging and feeding force at the same time can basically meet the requirements of extrusion die casting die forging process for aluminum alloy wheel hub of car, which has certain particularity and large size parts

and parts such as pistons of automobile internal combustion engines, connecting rods, housings of air-conditioning compressors of cars or cylinder heads of small engines can be produced easily with extrusion die-casting die-forging machines with die forging force below 2500kN.

the production rhythm of extrusion die-casting die-forging machines is the same as that of ordinary die-casting machines. The production efficiency of general small extrusion die-casting die-forging machines can exceed 10000 pieces/year

extrusion die casting and forging process can produce liquid die forging (melt forging) parts with the most complex structure, and the surface roughness and accuracy of the blank are higher than those of ordinary die casting process. It can also produce various deformed aluminum alloy parts with complex structures, effectively eliminating the limitation that such materials can only be produced by forging process in the past

4. The feasibility and benefit of using extrusion die casting die forging process for high-strength and high hardness aluminum alloy cup-shaped shell parts

Application of precision extrusion die casting dynamic and static universal testing machine for high-strength and high hardness aluminum alloy cup-shaped shell parts. The analysis of die forging processing is as follows:

using precision forging processing, the material utilization rate is improved to a certain extent, but the blank accuracy is poor, there are many production processes, the machining allowance is still large, and the production efficiency is not high, The cost is also high

with the traditional die-casting method, due to the poor fluidity of high-strength cast aluminum alloy and deformed aluminum alloy, the high-speed and high-pressure mold filling of thick wall castings will inevitably produce serious casting defects, which completely cannot meet the product performance requirements

5. Conclusion

extrusion die casting die forging process is essentially a continuous casting and continuous forging process, which belongs to an expression of the ultimate forming process of mechanical foundation

the blank produced by this process has short casting and forging process flow and high dimensional accuracy, which only requires finishing with a very small allowance; The surface of the blank is bright and clean, almost duplicating the surface roughness of the mold, with the gloss of machining means. The most important thing is the forging feeding of the main power cylinder (forging cylinder) of the equipment to the casting solidification process. As long as the forging feeding parameters are properly selected, most of the defects of how to maintain the blank thickness Jinan gold testing machine can be completely eliminated in theory, avoiding the waste of machining work, and realizing low cost and high efficiency