<ins id="7hrhd"></ins>
<cite id="7hrhd"></cite>
<var id="7hrhd"><strike id="7hrhd"></strike></var>
<var id="7hrhd"></var><var id="7hrhd"></var>
<var id="7hrhd"></var>
<progress id="7hrhd"></progress>
<var id="7hrhd"></var>
<var id="7hrhd"><strike id="7hrhd"><listing id="7hrhd"></listing></strike></var>
<var id="7hrhd"><strike id="7hrhd"></strike></var>
<var id="7hrhd"></var>
<var id="7hrhd"></var>
<var id="7hrhd"></var><menuitem id="7hrhd"></menuitem>
<var id="7hrhd"><video id="7hrhd"><thead id="7hrhd"></thead></video></var>
Industry News

Tel: 86-312-5912312        


Mob: 86-15630832212    


E-mail: info@risingsuncasting.com


Industry News
CNC plasma cutting machine flame cutting the fire problem and skills summary!
作者:  來源: http://www.7jj33.com/hydt/n621.html   發布時間:2014-12-20

Before know flame cutting adjustable fire skills, we need to understand first under different gas proportion of three kinds of cutting torch. In general, when using flame cutting way, by adjusting the ratio of oxygen and acetylene can get three cutting flame: neutral flame (i.e., normal flame), oxidizing flame, reducing flame. Normal flame characteristics in the reduction zone without freedom of oxygen and carbon, there are three obvious area, flame core has a distinct outline (close to the cylindrical). Flame core ingredients are acetylene and oxygen, the homogeneously round and light at the end of the shell. The shell is composed of overheated carbon particle. The temperature of the flame core is 1000 ℃. Reduction zone in the flame core, and the brightness of the flame core is the obvious difference between it darker. Acetylene reduction zone by the product of incomplete combustion, oxidation of carbon and hydrogen, reducing the temperature can reach 3000 ℃ or so. Outer flame combustion zone, located in the reduction zone, it is composed of carbon dioxide and water vapour, nitrogen, changes in its temperature is between 1200 ~ 2500 ℃.

Here what we call the neutral flame is normal cutting state, but in practice, the fire is the final result of success, actually appears oxidizing flame and the possibility of reducing flame is still relatively high, so what is the characteristics of oxidizing flame and reducing flame? As well as the problems of oxidizing flame reducing flame in there?

Oxidizing flame was produced under the condition of the excess oxygen, the flame core is conical, significantly shorten the length, shape also not clear, the brightness is dim; Also, reduction zone and outer flame is shortened, the flame is purple blue, burning with a noise, the noise size associated with the pressure of oxygen, oxidizing flame temperature is higher than normal flame. If using oxidizing flame cutting, will worsen cutting quality obviously.

Reducing flame was produced under the condition of acetylene in surplus, the outline of the flame core is not obvious, at the end of the flame core with a green edge, according to the edge of the green to judge the excess of acetylene; Reduction zone abnormal bright, almost and flame core is mixed as a whole; Outer flame yellow. When too much acetylene excess, began to smoke, this is because in acetylene flame combustion due to the lack of necessary oxygen.

The energy of the preheat flame size quite close relationship with cutting speed, quality of incision. With the increase of cut workpiece thickness and cutting speed is accelerated, the energy of the flame should also increases, but not too strong, especially in thick plate cutting, metal increases the burning heat of reaction, strengthened the ability of cutting point front preheating, then more preheating flames would make serious melt incision on the edge collapse edge; Preheat flame is too weak, and can make the steel plate can not get enough energy, to reduce the cutting speed, and even led to the suspension of cutting process. So the strength of the preheating flames and the relationship between cutting speed are mutually restricted.