What are the processing technologies for automobile stamping die processing?

There are many kinds of automobile stamping die processing technologies, and different technologies are suitable for different die parts and processing requirements, mainly including the following:

Cutting process

Turning: It is used to process revolving parts of molds, such as round mold seats, cores and ejector pins. Through the rotary motion of the lathe and the feed motion of the cutter, the blank material is processed into the required shape and size, which can ensure high dimensional accuracy and surface smoothness.

Milling: The plane, curved surface and cavity of the mold can be machined. Using the cutter rotation of the milling machine and the movement of the workbench, the cutting of mold materials is realized. Ordinary milling can process a plane with general accuracy and a cavity with simple shape, while NC milling can accurately control the tool path through programming to process a complex curved surface shape, such as the die surface of an automobile panel.

Drilling: it is mainly used to process various holes on the die, such as installation holes, cooling holes and ejection holes. The drill bit rotates and cuts on the mold material to form the required hole. The key to drilling is to ensure the position accuracy and verticality of holes. For some high-precision holes, reaming or boring is needed to further improve the accuracy.

Grinding: used for precision machining of the surface of the mold to obtain high dimensional accuracy and surface smoothness. Plane grinding can process the upper and lower planes of the die to achieve higher parallelism and flatness; Cylindrical grinding is used to process the circular surface of the mold, such as core and guide post; Internal grinding is used to process the inner hole surface of the mold.

EDM technology

EDM: Using the high temperature generated by pulse discharge, the shape of die electrode is copied to the workpiece, which is suitable for machining cavities and holes with various complex shapes, especially for some parts that are difficult to be completed by traditional cutting, such as narrow slits, deep grooves and special-shaped holes. By reasonably selecting electrode materials and processing parameters, high processing accuracy and surface quality can be achieved.

WEDM: The required shape and size are cut by pulse discharge between the electrode wire and the workpiece. It is often used to process the punch, die, fixed plate and other parts of the mold, and can process various straight and curved shapes with high machining accuracy and good surface roughness. It can cut materials with high hardness, and some quenched die parts can be directly processed without annealing treatment, thus avoiding deformation caused by heat treatment.

Forming process

Forging: by applying pressure to the metal blank, it will produce plastic deformation, thus obtaining the required die shape and performance. Forging can improve the internal structure of metal and improve the strength and toughness of die. For some large automobile stamping dies, such as the die holder of the body panel die, forging process is often used to manufacture the blank to ensure its quality and performance.

Casting: A method of pouring liquid metal into a mold cavity, and obtaining mold parts after cooling and solidification. It is suitable for manufacturing mold parts with complex shapes, such as some die-casting molds and injection molds with complex inner cavity structures. Different casting processes, such as sand casting and precision casting, can be used, and the choice can be made according to the precision and surface quality requirements of the mold.

Special processing technology

Laser processing: using high energy density laser beam to process mold materials. It can be used for cutting, punching, welding and surface treatment of molds. Laser cutting has the advantages of fast cutting speed, high precision and narrow incision, and is suitable for processing various mold parts. Laser drilling can process tiny holes on the die, and the quality of the holes is good; Laser welding can be used for mold repair and local strengthening.

Electrolytic machining: Based on the principle of electrolysis, die materials are machined by anodic dissolution in electrolyte. It is suitable for processing conductive materials with high hardness and strength, and can process cavities and surfaces with complex shapes, and there is no cutting force in the processing process, which will not cause mold deformation. However, the cost of electrochemical machining equipment is high, and the machining accuracy and surface quality are greatly affected by factors such as electrolyte.