Sam as the main branch of thermal cutting applications of the CNC flame cutting machine, the processing of large thickness, easy to operate, stable cutting quality is one of the biggest advantages, compared with the plasma cutting, flame cutting the biggest advantage is its large range of cutting thickness, generally more than 20 mm above the material cutting by flame cutting. But if the slot after make a big quantity, easy to make slag blocking cut at the bottom of the mouth cutting difficult. Large and thick plate after cutting the amount of drag, can cut sewn from observed and measured. After cutting process, the amount of drag is inevitable. After tow hours, slot width uniformity, smooth surface, no big comb teeth protrude and horizontal trough.

Oxygen to the entire system, including the pressure reducer, all kinds of joints and valves, torch intake pipe, nozzle aperture to satisfy the corresponding aerobic capacity, avoid to produce throttling phenomena. According to the thickness of steel plate and the cutting length, prepare enough air supply, so as to avoid midway was interrupted by the oxygen exhausted cutting (big thickness steel cut is very difficult to back up).

In order to make the CNC cutting machine flame cutting process smoothly, often make the torch in the cut at a point of view, after the flame through the workpiece, cutting torch while moving gradually returned to the vertical position cutting torch.

Big thickness cutting prone to procrastinate, after cutting will end because after drag, the artifacts have cut opaque phenomenon, at the bottom of the parts cannot be separated. In order to solve this problem, can be in cutting end, torch will move when the work piece, the cutting torch backward of about 10 ° or so, and cutting speed slow, this reduces drag.

CNC plasma cutting machine cutting thickness 300 mm above the large thickness of workpiece, should choose a large number of cutting torch and the nozzle, and to supply enough oxygen gas cutting. Started cutting, preheating flames, first by the edge of the artifacts edges start preheating, the workpiece preheating to cutting temperature, gradually open the big cutting oxygen and poured after the mouth; DaiGong all cut through a edge, the more cut oxygen flow, and the tongue is perpendicular to the workpiece, the cutting nozzle along the secant move forward at the same time. Is bigger when the thickness of the steel plate cutting speed is more slow, cutting nozzle to make lateral drifts.

Moment of the flame cutting height and cutting speed are significantly affects the quality of the slot, will affect the quality of the CNC flame cutting factors will cause the cutting size error analysis is as follows:

1, if the panel flatness condition is bad, after cutting easy to cause the size change;

2, for larger width strip line parts, using public cutting, first cut an edge, steel cut short head again after cooling method.

3, due to the slow flame cutting speed, preheat time is long, the steel plate to absorb too much heat can produce thermal deformation, according to the part shape and experience in CNC cutting program measures to solve them.

4, in cutting engineering, material internal stress as material removal, partial stress release and redistribution, will lead to displacement and deformation of steel plate, cutting size out-of-tolerance.

For more than 20-250 - mm below the plate, because the cutting is not going to happen when the variant and perforation operation easy to plug nozzle spray slag, so this kind of situation usually won't cut from the edge of steel plate, plate in the numerical control automatic gas cutting tend to have the quality problem of the cut surface vertical degree is not enough, at this time of the main is to ensure that the leveling and cutting plate is flat and level.

Flame cutting machine based on the different thickness of the plank should use different cutting speed, cutting gas pressure with different models, the torch of thickness of 6 to 20 mm sheet being heated variability, so are generally adopt the method of perforation cutting make the steel plate edge is closed, on the edge of the slot and the steel plate must keep distance, best can help to prevent problems caused by thermal denaturation of parts size deviation.

While many people know that the flame cutting machine has the ability of cutting big thickness, but in practice requires the operator to have a familiar and skilled process, a lot of customers of different thickness of the sheet cutting it is concluded that the cutting quality is very confused. In the aspects of cutting speed and cutting gas pressure regulation will need a process. Above several cutting techniques are effectively improve flame cutting machine in cutting all kinds of different dimensional precision and cutting efficiency of the thickness of the plate, of course with the technician of operation skills have a close relationship.

Generally 5 ~ 20 mm cutting thickness, oxygen pressure 0.25 MPa, acetylene pressure 0.02 MPa, the cutting speed in 500 ~ 600 mm/min, we can give each nozzle diameter, Sam automation sheet thickness, the relationship between the oxygen pressure form (but is experience value is for reference only) :

Nozzle diameter of 1 mm

Sheet thickness 4 mm        cutting oxygen pressure 0.2           cutting speed is 450 ~ 500 mm/min

Sheet thickness 5 mm        cutting oxygen pressure 0.3           cutting speed is 400 ~ 800 mm/min

Sheet thickness 10 mm      cutting oxygen pressure 0.35          cutting speed is 400 ~ 800 mm/min

Sheet thickness 15 mm      cutting oxygen pressure 0.375        cutting speed is 300 ~ 375 mm/min

Sheet thickness 20 mm      cutting oxygen pressure 0.4            cutting speed is 260 ~ 350 mm/min

In short with cutting oxygen pressure maximum cutting thickness, flame cutting are basic check is not much, plasma cutting speed is faster.