In the process of mechanical processing, the common methods of plate cutting are manual cutting, semi-automatic cutting machine cutting and CNC cutting machine cutting. Manual cutting is flexible and convenient, but manual cutting has poor quality, large dimensional error, large material waste, and large amount of subsequent processing work. At the same time, poor labor conditions and low production efficiency. The profile cutting machine in the semi-automatic cutting machine has better quality for cutting workpieces. Because it uses cutting dies, it is not suitable for single piece, small batch and large workpiece cutting. Although other types of semi-automatic cutting machines reduce the labor intensity of workers, their functions are simple and only suitable for cutting some more regular shaped parts. Compared with manual and semi-automatic cutting methods, CNC cutting can effectively improve the cutting efficiency and cutting quality of sheet metal, and reduce the labor intensity of the operator. In China, the use of manual and semi-automatic cutting methods is even more common in some small and medium-sized enterprises.
The amount of steel used in China's machinery industry has reached more than 300 million tons, and the amount of steel cut is very large. With the development of modern machinery industry, the requirements for work efficiency and product quality of sheet cutting have also increased. Therefore, the market potential of CNC cutting machines is still very large, and the market prospect is relatively optimistic. [2]
status quo
1. After decades of development, CNC cutting machines have made great progress in both cutting energy and CNC control systems. Cutting energy has developed from a single flame energy cutting to multiple energy sources (flame, plasma, laser, high-pressure water (Jet) cutting method; CNC cutting machine control system has developed from the original simple functions, complex programming and input methods, and low automation to full-featured, intelligent, graphical, networked control methods; the drive system Step drive, analog servo drive to today's all-digital servo drive;
The main varieties of CNC cutting machines include the following:
CNC high pressure water jet cutting machine
Other special special cutting equipment (such as CNC pipe cutting machine, CNC profile cutting machine, other non-metal special cutting equipment, etc.)
2. Characteristics and application of various types of CNC cutting machines
CNC flame cutting machine, cutting with large thickness carbon steel cutting ability, lower cutting cost, but there are large cutting deformation, cutting accuracy is not high, and cutting speed is low, cutting preheating time, piercing time is long, it is difficult to adapt to full automation Operational needs. Its application is mainly limited to cutting of carbon steel and large thickness plates, and it will gradually be replaced by plasma cutting in cutting of medium and thin carbon steel plates.
CNC plasma cutting machine, plasma cutting has a wide cutting area, can cut all metal plates, fast cutting speed, high efficiency, cutting speed can reach more than 10m / min. Plasma cutting under water can eliminate the noise generated during cutting, pollution by dust, harmful gas and arc light, and effectively improve the working environment. The use of fine plasma cutting has brought the cutting quality close to the level of laser cutting. With the maturity of high-power plasma cutting technology, the cutting thickness has exceeded 100mm, which has broadened the cutting range of CNC plasma cutting machines.
CNC laser cutting machine has the characteristics of fast cutting speed and high precision. The laser cutting machine is expensive and the cutting cost is high. It is only suitable for the cutting of thin plates with high precision requirements.
NC high-pressure water jet cutting machine, suitable for cutting any material (metal, non-metal, composite material), high cutting accuracy, no thermal deformation, environmentally friendly cutting method. Its disadvantages are slow cutting speed, low efficiency and high cutting cost.