What does Hot forged mean?
Hot forging can be defined as “a metal shaping process in which a malleable metal part, known as a billet or workpiece, is worked to a predetermined shape by one or more processes such as hammering, upsetting, pressing and so forth where the workpiece is heated up to about 75% of its melting temperature”.
What is gear forging?
Gear forging processes include blank forging, normalizing, turning machining, hobbing on shaper machine, gear shaving, heating treatment, grinding machining. Following shows the detailed introduction of each forging process.
Does hot forging increase strength?
The cold forging manufacturing process increases the strength of a metal through strain hardening at a room temperature. On the contrary the hot forging manufacturing process keeps materials from strain hardening at high temperature, which results in optimum yield strength, low hardness and high ductility.
Which is better cold or hot forging?
Cold forging improves the strength of the metal by hardening it at room temperature. Hot forging results in optimal yield strength, low hardness, and high ductility by hardening the metal at extremely high temperatures.
Is hot forging expensive?
Disadvantages of Hot Forging Hot forging is also often more expensive than cold forging because of the heat treatment necessary to start the forging process, as well as the cooling process that prevents warping.
How does hot forging work?
In hot forging process, forging is carried out at a temperature above the recrystallization temperature of the metal which means at the temperature at which the new grains are formed in the metal. This kind of extreme heat is necessary in avoiding strain hardening of the metal during deformation.
Why are gears forged?
When the gear design has a relatively simple configuration, forging is a viable process. To make forged gears, steel ingots are cast, reduced in size, and forged into the desired shape. The forging process mechanically works the steel, thereby enhancing its fatigue properties.
Are gears forged?
Gears have been forged from low-alloy steel, brass, aluminum alloys, stainless steel, titanium, and some of the heat-resistant alloys. Gears with a DP of 5 to 20 are commonly forged with little or no machining allowance. The die life decreases significantly when forging finer-pitch gears.
What are the main two advantages of hot forging?
Hot forging entails the heating of a workpiece to about 75% of its melting temperature. This allows for the flow stress and energy required to form the metal to lower, effectively increasing the rate of production (or strain rate). Hot forging aids in making the metal easier to shape as well as less likely to fracture.
What is edging in forging?
” Edging” is the process of concentrating material using a concave shaped open-die. The process is called “edging” because it is usually carried out on the ends of the workpiece. ” Fullering” is a similar process that thins out sections of the forging using a convex shaped die.
What is the minimum temperature given before hot forging?
200°C.
Explanation: Hot forging is a method of forging articles at an extremely high temperature. But, before putting the article into the hot forging processes, it has to be heated to certain temperatures. The minimum temperature that has to be given to the article should be 200°C.
Can you forge a gear?
To make forged gears, steel ingots are cast, reduced in size, and forged into the desired shape. The forging process mechanically works the steel, thereby enhancing its fatigue properties. Forging dies are generally required, especially if the entire gear is forged, not just the rim and hub.