The ignition temperature of the material must be lower than its melting temperature. Everyone who uses CNC flame and plasma cutting machine knows that preheating is very important in flame cutting. The cutting process of oxygen cutting of CNC cutting machines is by spraying pure oxygen on the surface of the workpiece ( At least 99.5%) to start with. The heating flame starts the process by heating the starting point of the workpiece to be cut to ignition temperature. Combustion begins by delivering cutting oxygen.  Due to the increase in heat, combustion continues rapidly in adjacent workpieces.  The moving cutting torch cuts a section, and the molten secondary melt is blown away by the kinetic energy of the cutting oxygen jet. The following conditions must be met when cutting.

Maintain the ignition temperature continuously at the cutting point.Heat losses are compensated by the heating flame.After preheating, it can cut non-alloy steel with a carbon content below 0.3% and low-alloy steel with a carbon content above 0.4%. In order to eliminate the metal oxides formed, the melting temperature of the oxides must be lower than the melting point of the material.

CNC flame and plasma cutting machines have large thickness carbon steel cutting capabilities and low cutting costs, but they have the disadvantages of large cutting deformation, low cutting accuracy, low cutting speed, long cutting preheating time and long piercing time, making it difficult to adapt to all situations. Automatic operation. Its application is mainly limited to the cutting of carbon steel and large-thickness steel plates. The cutting of thin carbon steel plates will gradually be replaced by plasma cutting.Overall, CNC cutting machines have become extremely popular. Different cutting methods will result in different cutting quality and processing efficiency. However, overall, CNC cutting has greatly improved the processing efficiency of downstream industries.

Preheating requirements for CNC flame and plasma cutting machines The preheating setting of CNC cutting machines is a means of adjusting the temperature of the flame body.In actual operation, the length of preheating time of the CNC cutting machine needs to be considered according to the thickness of the cutting, but does this indicate the flame temperature? The higher the cutting effect, the better the effect?

As the proportion of metal elements increases, the cutting process becomes increasingly difficult.  Therefore, materials such as chromium steel, nickel or silicon metal, cast steel, etc. are not suitable for oxygen cutting.  These materials should be processed by other methods than thermal cutting.  Other equipment such as gantry CNC plasma cutting machines will come in handy.