Key Benefits of Die Forgings
Die forging as a state-of-the-art metal forming process plays a crucial role within contemporary manufacturing. Firstly, die forgings have excellent mechanical properties. Throughout the process of forging, metal flow lines constantly spread along the part profile, considerably improving the strength, stiffness, and resistance to fatigue of the component. Die forgings have typically 20-30% higher strength and 3-5 times longer fatigue life than castings or machined components. Secondly, near-net shaping by the die forging process means that the material utilization rates are as high as 80-95%, considerably saving the subsequent machining allowances while decreasing production costs and the required energy. Thirdly, die forgings have excellent dimensional accuracy and higher surface quality as a rule, having IT7-IT8 class precision and surface roughness of Ra3.2-6.3μm, saving secondary finishing operations.Fourthly, die forging lends itself well for mass production by short individual piece cycles and high productivity - a set of a die as a rule produces 50,000-500,000 parts, reflecting considerable economy of scales. Last but not least, the process makes possible the production of complexly shaped parts such as crankshafts, connecting rods, and gears that by alternative methods would be produced by composite procedures.
Material Range For Die Forgings
Die forging finds application across a wide range of materials, mainly including the following types:
Carbon steels and alloy steels are the most widespread die forging materials, ranging from low-carbon content grades to high-carbon content grades. Low-carbon steels (e.g., 20#, Q235) have good plasticity and weldability and are widely used as non-bearing components; medium-carbon steels (e.g., 45#, 40Cr) exhibit good integrated mechanical properties after heat treatment and are widely used in automotive and machinery industries; high-carbon steels (e.g., 60#, 65Mn) and high-alloy steels (e.g., 20CrMnTi, 42CrMo) are used for the production of key components with high strength and abrasion resistance requirements.
Stainless steel forgings are used primarily for corrosion and elevated temperature application. Austenitic stainless alloys (304, 316) offer good resistance to corrosion and formability; martensitic stainless alloys (410, 420) achieve good hardness through heat treatment; duplex stainless alloys (2205) possess excellent corrosion resistance along with elevated strength.
aluminum alloy forgings The common types include 2-series (2024), 6-series (6061, 6063), and 7-series (7075) aluminum alloys, commonly used for aerospace and automobiles lightening. The aluminum forgings possess good specific strength, good corrosion resistance, and easy surface treatment.
Titanium alloy forgings are primarily for premium uses. Commercially pure titanium (TA1, TA2) and α+β titanium alloys (TC4) have excellent specific strength, corrosion resistance, and biocompatibility and are thus suitable for aerospace and medical implants but require advanced equipment and technology for forging.
Copper alloy forgings particularly stand out due to good electrical/thermal conductivity and corrosion resistance. Brass (H62, H68), bronze (QSn6.5-0.1), and cupronickel (B10, B30) are certain common forged copper alloys and find broad application within the electronics, marine, and chemical equipment industries. Those include the magnesium alloys (AZ31, AZ91) and the nickel-based super alloys (GH4169), and they are also die forged for meeting harsh service requirements. Material selection requires a careful weighing of part function, service conditions, and cost for optimum technical-economic performance.