Ring rolling (also known as ring expanding, ring rolled) is a plastic manufacturing process that relies on ring rolling machine (also known as ring mill, hot continuous ring rolling, hole expanding machine) to cause continuous plastic deformation of ring, so as to complete wall thickness reduction, diameter expansion, and cross section contour forming.
What is Ring Rolling Forging?
Ring rolling (also known as ring expanding, ring rolled) is a plastic manufacturing process that relies on ring rolling machine (also known as ring mill, hot continuous ring rolling, hole expanding machine) to cause continuous plastic deformation of ring, so as to complete wall thickness reduction, diameter expansion, and cross section contour forming. This technology is applicable to the production of circular mechanical parts of various shapes and sizes, such as rolling bearing rings, gears, flanges, rims, thick wall cylindrical pieces, wind turbine flanges, high neck flanges and other seamless ring forgings.
The usage of Ring Rolling Forging
Ring rolling products are widely used in many industrial production industries such as mechanical equipment, vehicles, trains, ships, petrochemical equipment, airlines, aerospace, nuclear energy, wind turbines, etc. The materials of rings are usually carbon steel, alloy steel, stainless steel, titanium metal, alloy copper, aluminum alloy profile, cobalt alloy, nickel base super alloy, etc.
Ring Forging Process from Raw Material
Step 1: Smelt and pour liquid steel to make steel ingot;
Step 2: Heat steel ingot and blank to produce steel bar;
Step 3: Cut steel bar to get billet by saw cutting machine;
Step 4: Upset by power press/forging hammer to get round cake;
Step 5: Punch and pierce to make blank by forging equipments;
Step 6; Ring rolling by ring rolling machine;
Step 7: Make heat treatment and machining.
Seamless Rolled Ring Forging Advantages
When acquiring metal rings for any application, issues can often be traced to the metal forming process. Cast rings are often plagued with poor strength and integrity. Rolled and welded or cut rings from plate are susceptible to fatigue, and carry excess material and processing costs. Ring Rolling forging by Wuxi Daqiao Ring Rolling Machine, however, allows greater versatility and improved quality while reducing material cost. Other benefits include:
Controlled directional grain flow
Increased strength
Superior structural integrity
Elimination of inclusions and porosity
Minimized waste
Eliminates welding, which reduces part fatigue and breakage risks
Compared to Hot Rolled Burnout Plates
The unidirectional grain flow inherent in hot rolled plate produces exposed grain ends when cutting the ring shape. This renders the material more liable to fatigue and more sensitive to stress corrosion cracking. The forging process shapes the material to the desired ring size so there is no need to remove excess corner stock or center holes. Additionally, material availability and plate size for large burnout plates may be difficult to obtain. Overall, forging allows greater size versatility while minimizing material waste, often reducing costs.
Compared to Castings
Cast rings typically do not have a desired grain structure. This greatly impacts the impact toughness, ductility and fatigue strength of the ring and can lead to a potential crack or fracture. Forging provides controlled directional grain flow or increased strength and offers superior structural integrity, eliminating inclusions and porosity commonly found in castings.
Compared to Rolled and Welded Rings
Fabricated rings are susceptible to porosity and inclusions in the material. Extensive welding on a rolled and welded ring reduces part integrity, jeopardizes corrosion resistance and may cause distortion of the ring's shape. With the absence of welding through the seamless rolled ring forging process, part integrity, corrosion resistance, and shape can be maintained…ultimately achieving a stronger ring while reducing risk of part fatigue and breakage.
Ring Rolling Machine Manufacturer
Wuxi Daqiao Bearing Machinery Co., Ltd, as a leader in ring rolling line in China, began to produce ring rolling machine in 1983. Daqiao produces both vertical type and horizontal type ring rolling machines. The ring manufacturers can choose manual and automatic as per their requirements. Till now, Daqiao have exported the ring rolling machines to UK, South Korea, Poland, Belgium, Russia, Turkey, Pakistan, Vietnam, India, Pakistan, Argentina Israel etc. more than 20 countries. Sincerely welcome to visit our company and hope to establish good cooperation with friends all over the world!