How much do you know about the characteristics of Zhangqiu forgings?
Zhangqiu forging has a wide range of weight, ranging from a few grams to hundreds of tons, its quality is higher than that of castings, its mechanical properties are better than castings, and it can withstand greater impact force and other heavy loads.
Therefore, it can be used for some important and stressed parts.
For high carbide steel, the quality of Zhangqiu forging is better than that of rolled steel.
For example, high-speed steel, this kind of rolled material, can meet the requirements only after forging.
In particular, the high-speed steel milling cutter must be modified.
The lightest.
Under the premise of ensuring the design strength, Zhangqiu forgings are lighter than castings, which reduces the weight of the machine itself, and is of great significance to vehicles, aircraft, vehicles and aerospace equipment.
Save raw materials.
Precision forgings can not only save more raw materials, but also save more processing time.
High productivity.
Because of the flexibility of free forging, forging method is widely used in some repair factories to produce all kinds of accessories.
According to the defect analysis of Zhangqiu forgings, the phenomenon that the oxidized metal billet reacts with the oxidizing gas in the furnace to form oxide is called oxidation.
The production of oxide scale will not only cause metal burnout, but also reduce the surface quality and dimensional accuracy of forgings.
When the depth of the oxide scale into the forgings exceeds the machining allowance, the forgings will be scrapped.
Decarburization, the phenomenon that the carbon on the surface of the metal billet reacts with oxygen and other media in the heating process, resulting in the reduction of carbon on the surface is called decarburization.
Decarburization will reduce the hardness and wear resistance of the surface layer.
If the thickness of the decarburized layer is less than the machining allowance, it will not cause harm to the forgings; otherwise, it will affect the quality of Zhangqiu forgings.
Rapid heating, coating protective coating on the surface of billet and heating in neutral or reducing medium can slow down decarburization.
Overheating, because the heating temperature is too high or the holding time at high temperature is too long, the phenomenon of coarse grain size of metal billet is called overheating.
Overheating will reduce the plasticity of billets and the mechanical properties of Zhangqiu forgings.
Therefore, the heating temperature should be strictly controlled to shorten the holding time in the high temperature stage as much as possible to prevent overheating.
Overheating, when the heating temperature of the metal billet exceeds the initial forging temperature too much, causes the grain boundary oxidation and melting, which is called overheating.
After overfiring, the strength of the material is seriously reduced and the plasticity is very poor.
Once forged, it will be broken into scrap and cannot be preserved.
Therefore, the correct operating specifications must be strictly implemented.
Cracks.
When heating large Zhangqiu forgings, if the loading temperature is too high or the heating speed is too fast, the temperature difference between the forging core and the surface will be too large, resulting in excessive internal stress, resulting in cracks.
Therefore, when heating large forgings, heat protection measures should be taken to prevent the loading temperature from being too high and the heating speed too fast.
The main axis is placed on the die chamber to form Zhangqiu forgings with similar two-dimensional dimensions in the horizontal direction.
Upsetting steps are usually used in die forging of this kind of forgings.
It is subdivided into groups according to the difference of forming difficulty.
Forgings formed by upsetting and slightly indentation, such as gears with little change in height between hub and flange.
Forgings formed by extrusion and slightly upsetting and by both extrusion, indentation and upsetting, such as universal joint fork, cross shaft, etc.
Forgings formed by compound extrusion, such as hub shafts, etc.
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