CNC Profile Cutter in Relation to Plasma Cutting

CNC profile cutter is used to cut metals for a wide range of purposes. It is a metal plate cutting machine that employs the use of plasma, sometimes it can be combined also with oxy-fuel cutting technology to further intensify its ability to cut through metal.  

Defining Oxy-Fuel Cutting

We are qualifying oxy-fuel cutting as among the most economical material cutting process. It is practically used to cut through the steel of all sizes and shapes.  They are applied on CNC cutting machine to help in cutting and tracing out shapes off a steel plate. But how exactly is this process really carried out? 

Perhaps at one point in time, you came across this term already, describing oxy-fuel cutting as some kind of torch cutting, burning, or some would even refer to it as flame cutting. All these terms that other people are using to describe oxy-fuel cutting have an element of truth in them, because they somehow describe the process, although not in the most precise manner. 

The oxy-fuel torch comes with a flame, and you will “burn” the steel as it cuts through a sheet of this metal. There is a chemical process taking place here which others refer to as the “rapid rusting” of the steel. Regardless if you will see it as rusting or burning, the end result would be one and the same — the sheet of steel is oxidized in a snap by virtue of a chemical reaction that produces heat. 

How Does Oxy-Fuel Cutting in CNC Cutting Machines Work? 

Preheating

You can never cut through steel without heating it up first to its kindling temperature and that is 1800°F. Upon reaching this temperature level, the sheet of steel will readily react to oxygen. 

The required heat will be supplied for by preheat flames originating from the oxy-fuel torch. Inside this is a fuel gas combined with oxygen so that it will produce a very flammable mixture of gases. 

The nozzle comes in multiple holes which are arranged to form a circular pattern so as to direct the flammable mixture of gases into several little jets. The oxygen-filled fuel mixture will be ignited outside of the nozzle. The preheat flames will form right outside of the tip of the nozzle of your CNC profile cutter.   

Piercing

The moment that the plate’s edge or surface finally reached its kindling temperature, a stream of pure, 100% oxygen gas will be turned on and this will commence piercing via the plate. This process is referred to as the “cutting oxygen”. While the cutting jets of oxygen reaches the pre-heated steel, the rapid process of oxidation will start. This is the point in time when the real fun begins. 

The oxidation process involved here is identified exothermic reaction — it releases more heat than it requires to get started. The oxidized steel assumes the molten slag form, and it needed to get out of the way to allow the oxygen jet to “pierce” through the plate. 

With respect to the level of thickness of the plate, the amount of time this can get done with will take anywhere  1 or 2 seconds or so, but will not take more than a minute. At this point, the oxygen steam will push deeper into the plate. 

 As for the molten slag, it will be blown out through the piercing hole. This can lead to a massive molten steel geyser. But if it is carried out the right way, there is going to be a tiny puddle of slag can be found above the plate.