Numerical control flame cutting machine is mainly used in carbon steel and large thickness plate cutting, and it is gradually replaced by plasma cutting in the cutting of medium and thin carbon steel plates. Generally speaking, from the current domestic market application classification, the cutting ability of the large thickness carbon steel of the CNC flame cutting machine has been approved by the end users, taking into consideration The cost of flame cutting is low, but it has large cutting deformation, low cutting precision, low cutting speed, long cutting time and long perforation time, which is difficult to meet the needs of full automatic operation. How to improve the NC flame cutting machine's ability to process thickness and make it remain invincible in the competition becomes the focus of the future research and development of CNC flame cutting machine.
First of all, from the point of view of the application technology, the problem of the thick plate cutting of the numerical control flame cutting machine is easy to cause the problem of the cutting delay. The characteristic is that the performance is more obvious for the large thickness carbon rod processing. Leave. In order to solve this problem, when the cutting will end and the cutting torch will be removed from the workpiece, the cutting torch will be about 10 degrees after the cutting, and the cutting speed is slowed down so that the rear drag can be reduced.
When cutting the workpiece with a thickness of more than 300mm, a large number of cutting torch and cutting nozzle should be selected. In the beginning of cutting, the preheating flame should be large. First, the heat is preheated at the edge angle of the workpiece. When the workpiece is preheated to the cutting temperature, the cutting oxygen is gradually opened and the mouth is tilting. When the workpiece is completely cut through the edge, the cutting oxygen flow is increased and the mouth is perpendicular to the workpiece, while cutting the mouth is moving along the secant. When cutting the plate with larger thickness, the advancing speed is slower, and the cutting mouth needs to have a lateral crescent swing.
If the cutting seam produces a large amount of rear drag, it is easy to cause slag to jam the bottom of the cutting mouth and cause difficulty in cutting. The amount of rear haulage can be observed from the slots and can be measured. In the process of cutting, the drag is inevitable. The width of the slots is uniform and the surface is smooth with no large comb teeth and transverse grooves.
So we require the whole oxygen supply system of the numerical control flame cutting machine, including the pressure reducer, various joints and valve parts, the cutting torch intake pipe, the aperture of the cutting nozzle and so on to meet the corresponding oxygen supply ability and avoid the throttle phenomenon. According to the thickness and cutting length of the steel plate, prepare enough gas source to avoid interruption of cutting because of the exhaustion of oxygen.
Secondly, in terms of hardware structure, in order to facilitate the machining of thick plate perforation by numerical control flame cutting machine, we need to be equipped with a special height adjusting device. Due to the full automation of computer operation in the process, problems such as the deformation of the steel plate and the disintegration of the cutting surface can not be made in the first time. There is a serious accident of a torch collision. Especially in the use of numerical control flame cutting, because the cutting speed is relatively fast, the possibility of collision is higher.