Pressure sensor usually consists of a pressure sensor and a signal processing unit for measuring the pressure of liquids and gases. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors. According to the working principle, it can be divided into Ceramic Pressure Sensor, diffusion silicon pressure sensor, piezoresistive pressure sensor, sapphire pressure sensor and so on. Pressure Sensor,Miniature Pressure Transducer,Pressure Transducer,Hydraulic Pressure Transducer,pressure transmitter Xi'an Gavin Electronic Technology Co., Ltd , https://www.gamicos-meas.com
1. The laser cutting has a narrow slit and the workpiece has small deformation.
The laser beam is focused into a small spot that achieves a high power density at the focus. At this time, the heat input by the beam far exceeds the portion that is reflected, conducted or diffused by the material, and the material is quickly heated to a degree of vaporization to evaporate to form a hole. As the beam moves relatively linearly with the material, the holes are continuously formed into slits of narrow width. The trimming is minimally affected by heat and there is essentially no deformation of the workpiece.
An auxiliary vapor body suitable for the material to be cut is also added during the cutting process. The steel is cut with oxygen as the auxiliary vapor and the molten metal to generate an exothermic chemical reaction to oxidize the material, while helping to blow away the slag in the slit. A type of plastic for cutting polypropylene uses compressed air, and flammable materials such as cotton and paper are cut to use an inert gas. The auxiliary vapor entering the nozzle also cools the focusing lens, preventing smoke from entering the lens holder and contaminating the lens and causing the lens to overheat.
Most organic and inorganic materials can be laser cut. In the metal processing industry where industrial manufacturing systems are heavily weighted, many metal materials, regardless of their hardness, can be cut without distortion. Of course, for high reflectivity materials such as gold, silver, copper and aluminum alloys, they are also good heat transfer conductors, so laser cutting is difficult or even impossible.
Laser cutting without burrs, wrinkles, high precision, better than plasma cutting. For many electromechanical manufacturing industries, modern laser cutting systems controlled by microcomputer programs can easily cut workpieces of different shapes and sizes, which are often preferred over die cutting and molding processes; although they are slower than die punching, However, it has no mold consumption, no need to repair the mold, and saves time for mold replacement, thereby saving processing costs and reducing production costs, so it is more cost-effective to consider.
2. Laser cutting is a kind of non-contact processing with high energy and good controllability.
The laser beam is focused to form a very small point of action with very strong energy, and its application to cutting has many features. First, the laser light energy is converted into amazing thermal energy that is kept in a very small area, providing (1) narrow straight edge slits; (2) minimal adjacent heat affected zone of the trimming; (3) minimal local Deformation. Secondly, the laser beam does not exert any force on the workpiece. It is a contactless cutting tool, which means (1) the workpiece has no mechanical deformation; (2) no tool wear, and no problem with the conversion of the tool; (3) cutting The material does not have to be considered for its hardness, that is, the laser cutting ability is not affected by the hardness of the material to be cut, and any hardness material can be cut. Thirdly, the laser beam is highly controllable and has high adaptability and flexibility. Therefore, (1) it is convenient to combine with the automation equipment, and it is easy to automate the cutting process. (2) Since there is no limitation on the cutting workpiece, the laser beam It has unlimited contour cutting ability; (3) combined with computer, it can discharge the whole board and save materials.
3, laser cutting has a wide range of adaptability and flexibility.
Laser cutting has greater flexibility than other conventional processing methods.
First, as with other thermal cutting methods, as a thermal cutting process, other methods cannot act as a laser beam on a very small area, resulting in a wide slit, a large heat affected zone, and significant workpiece deformation. Lasers can cut non-metals, while other thermal cutting methods do not.
Second, the main process of laser cutting
1. Vaporization cutting.
Under the heating of the high power density laser beam, the surface temperature of the material rises to the boiling point temperature so fast that it avoids the melting caused by heat conduction, so that some of the material vaporizes into vapor and some of the material is ejected from the bottom of the slit. The auxiliary gas stream is blown away.
2. Melt cutting.
When the power density of the incident laser beam exceeds a certain value, the inside of the material at the beam irradiation point evaporates to form a hole. Once such a small hole is formed, it will absorb all of the incident beam energy as a black body. The aperture is surrounded by the molten metal wall and then an auxiliary gas stream coaxial with the beam carries away the molten material around the hole. As the workpiece moves, the small holes are simultaneously traversed in the cutting direction to form a slit. The laser beam continues to illuminate along the leading edge of the slit, and the molten material is blown away from the slit continuously or pulsatingly.
3. Oxidation melting cutting.
Melting and cutting generally uses an inert gas. If it is replaced by oxygen or other reactive gas, the material is ignited under the irradiation of a laser beam, and a strong chemical reaction with oxygen produces another heat source called oxidative melting cutting.
4. Control fracture cutting.
For brittle materials that are easily damaged by heat, high-speed, controlled cutting by laser beam heating is called controlled fracture cutting. The main content of this cutting process is that the laser beam heats the small area of ​​the brittle material, causing a large thermal gradient and severe mechanical deformation in the area, resulting in the formation of cracks in the material. As long as a balanced heating gradient is maintained, the laser beam can direct the crack to occur in any desired direction.
Main features and main process introduction of laser cutting
First, the main characteristics of laser cutting