- By lasernzh
- On 27/11/2018
Recently, the city of Minsk, Belarus, has experienced heavy fog and a large number of flights have been cancelled or delayed. The crew of a Belarusian airline flight, with almost zero visibility, chose to risk the autopilot landing system, so that the aircraft eventually landed safely. At that time, from the perspective of the pilot's cockpit, there was only a white curtain outside the window. The crew risked to believe in the automatic driving landing system. First, the situation was urgent. Second, the aircraft itself believed that the aircraft itself had good safety performance. In order to improve the quality of aircraft, modern scientists have been committed to introducing advanced manufacturing processes into aircraft manufacturing.
Laser cutting technology is one of them, waterproof laser pointer cutting technology has the characteristics of high efficiency, low energy consumption, short process, good performance, digitization and intelligence in the aerospace field. Laser cutting materials in the aerospace industry are titanium alloys, nickel alloys, chromium alloys, aluminum alloys, tantalum oxide, stainless steel, molybdenum titanate, plastics and composites. Laser cutting can be used to process aircraft skins, honeycomb structures, frames, wing bins, tail siding, helicopter main rotors, engine casings and flame tubes. Laser cutting generally uses continuous output laser YAG and CO2 lasers, as well as high-repetition CO2 pulsed lasers.
The distance between the cutting head and the workpiece and the perpendicularity of the nozzle to the surface of the workpiece during the cutting process are two extremely important factors. Directly affect the quality of the processing, so in order to improve the quality of cutting and reduce the production of waste, special sensors need to be installed on the cutting head to ensure stable and consistent cutting quality and increase process safety.
When the usb laser pointer cutting head changes the shape of the workpiece and the surface is uneven, the sensor automatically detects the change and automatically adjusts the height according to the change, so that the distance from the surface of the workpiece is always consistent, the material can be processed faster without continuously monitoring the present. The displacement sensor adopted at home and abroad is basically a capacitive type, and its structure and shape are adapted to the processing head, and is equipped with a detection signal processing unit.
Displacement measurement is one of the most basic measurement tasks. According to whether the sensor is in contact with the workpiece to be tested, the displacement sensor can be divided into contact type and non-contact type. Compared with the contact sensor, the non-contact sensor guarantees high resolution. At the same time, it has a fast dynamic response, low hysteresis error, and even zero.
Non-contact sensors, sometimes called proximity sensors, the earliest application is a proximity switch, that is, when the detected object approaches a sensitive distance to a sensitive probe, a switching signal is given. The current proximity sensor has been developed to detect not only objects. With or without, it gives the distance of the object from the sensitive probe and provides information about the shape and spatial position of the workpiece.
Because military laser pointer can be used to measure the displacement of moving objects, this kind of sensor is also called non-contact displacement sensor. Commonly used displacement sensors include hysteresis telescopic displacement sensor, eddy current displacement sensor, capacitive displacement sensor, inductor displacement sensor and so on.
According to the principle of various sensors, the capacitance sensor has high sensitivity and has the following characteristics: good dynamic response, because the electrostatic attraction between the plates is small, the required energy is very small, and the movable part can be made very small and thin. Therefore, its natural frequency is very high, its dynamic response time is short, and it can work at frequencies of several megahertz, which is especially suitable for dynamic measurement.
The utility model has the advantages of simple structure, strong adaptability, easy manufacture, easy to ensure high precision, and can be made into a small-sized sensor to realize special measurement, and can work in a harsh environment such as high and low temperature, strong radiation and strong magnetic field, and can withstand high pressure and high. Shock, overload, etc. The 488nm laser pointer is small and the temperature coefficient is small. Since the capacitance value of the capacitance sensor is independent of the electrode material, a material with a low temperature coefficient can be selected, and a good stability can be ensured when the external temperature is stable. The larger relative change is limited only by the linear region, and its value can reach 100% or more, which can guarantee the resolution and measurement range of the sensor.
- By lasernzh
- On 19/02/2018
Laser cutting machine industry has developed quite rapidly in recent years. From the initial YAG equipment and CO2 equipment to the current fiber, from low-power fiber to the current 10,000-watt fiber, which shows that our blue laser pointer technology continues to improve, and now the price of laser cutting equipment compared with previous years To be much cheaper, this is a very delightful thing for friends who want to buy equipment, no matter what the industry can afford the laser, afford to use the laser.
For the majority of customers, the purchase of equipment will shop around, so the competition among peers is bound to be ultimately! Nothing more than the concern of people who buy equipment, in addition to configuration, is the price and after-sales service, which is also the competition of major manufacturers. Price competition, the most common peer competition. When you consult the same piece of power equipment, there may be tens of thousands or even hundreds of thousands of price difference between the price. When it comes to configuration and technology, many people might say that the lasers are all for others, and for those of you who are just assembling them together, you do not need any technology at all. Yes, in appearance, this is indeed the case. So many people think that the green laser pointer cutting machine industry threshold low, high profits, just a few people can pull a few. However, how much is done and how much is sold.
Grasp the rules of laser cutting machine processing factors on the processing of surface quality, you can find ways to improve the surface quality of the process measures to improve the quality of the processing surface. When the laser is cutting the sheet at high temperature, the traces of the molten material do not appear in the notch below the vertical laser beam, and instead, it is ejected at the rear of the laser beam. As a result, the curved lines are formed at the cutting edge and the lines closely follow the moving laser beam. In order to correct this problem, the feed rate is reduced at the end of the cutting process and the formation of lines can be substantially eliminated.
The cutting width generally does not affect the quality of the cut. The cutting width has an important influence only when a particularly precise profile is formed inside the part because the cutting width determines the minimum internal dimensions of the profile. As the thickness of the plate increases, the cutting width also varies with Increase. So you want to ensure that the same high precision, regardless of the width of the incision, the workpiece in the high power laser cutting machine processing area should be constant; when the material thickness of more than 18mm, the cutting edge of the verticality is very important; away from the focus, the laser The beam becomes divergent, depending on the position of the focus, the cut becomes wider toward the top or bottom. Cutting edge deviation from the vertical line a few millimeters, the more vertical edge, the higher the cutting quality.
The heat-affected zone refers to the laser cut where the area along the incision is heated. At the same time, the structure of the material itself changes. For example, some materials can harden. Heat affected zone refers to the regional structure of the internal structure changes due to high temperature; and depression and corrosion of the cutting edge of the surface has an adverse effect on the appearance of laser cutting machine. They appear in the general should avoid the cutting error; Finally, if the cutting makes the part heated rapidly, it will be deformed. This is especially important in fine workmanship, where the contours and tabs are usually only a few tenths of a millimeter wide. Controlling laser power and using short 500mw laser pointer pulses can reduce the risk of heat build-up and avoid distortion.
As said above, there are many manufacturers, the equipment sold out is very cheap, of course, with spare parts and machine tools are poor. Such manufacturers generally do not have a long-term strategic plan of sustainable development, there is no core technology. What they do is some low-end things, simple assembly is also OK, if they let them study some high-tech stuff, there is no professional talent, to give him the same configuration of components, they also create good equipment. In addition to a laser device, the machine tool is also important, the same laser, different manufacturers to make the device, and some can use for years without any major problems, but some day-to-day problems.
- By lasernzh
- On 14/09/2017
Maozhi cold-rolled sheet is an important raw material for automobile, household appliances, electronics and light industry production demand. There are many ways to process the surface of the roll. As the laser wool technology has more advantages in processing methods, improved molding performance, post-coating brightness and production cost than other methods of hair, laser wool technology Has been highly valued by iron and steel enterprises.
The principle of laser hair is the use of specially modulated high-energy density of high repetition frequency of the pulsed blue laser pointer beam after the incident into the roll surface after the implementation of preheating and strengthening, at the gathering point to form a tiny pool, while the side blowing device The micro-bath is designed to set the auxiliary gas in the direction of pressure, flow and direction so that the melt in the bath can be deposited as far as possible to the edge of the molten pool to form a circular-shaped projection. The preheating zone, The roll is rapidly cooled under the action of thermal conductivity to form a hardening zone, and then, during the rolling or flattening of the sheet, the bumps on the roll surface form a number of deformed hardened particles on the plate surface to form a laser burr plate.
Laser wool technology not only can improve the surface quality and molding performance of steel, but also strengthen the roll, improve the wear resistance of the roll. In the process of tensile deformation, the hardened points of the discrete distribution play the role of homogenization, stable deformation and delayed deformation, so that the elongation of the steel plate The rate was significantly higher than that of the same material. At the same time, the surface roughness of the surface of the laser pointer wool can enhance the adhesion of galvanized, tinned and other coatings, and improve the brightness of the surface coating.
The method of laser rolling the surface of the roll is that the roll rotates about its own central axis, and the laser processing head moves axially along the bus of the roll, and the pulsed laser or continuous laser is mechanically transformed into a pulsed laser Or through the acousto-optic switch into a pulsed laser, through the optical path transmission and focusing, acting on the surface of the roll, the laser action of the point to form a high-density spiral. As the spiral angle is very small, people generally see it as a circular line. Since the size of each pulse laser is uniform, the energy of each pulse astronomy laser pointer acting on the roll surface is also consistent, so the size of each point is also consistent. Thus, the effect of the roll surface being burnt is an evenly arranged lattice in an ordered arrangement.
CNC system can store massive wool processing program, according to the roll of different roughness and spindle speed requirements, set the different axial linear density, the choice of circumferential frequency section, the laser power to establish laser hair process database. The operator only need to call out the corresponding application according to the roughness requirements, set the starting and ending parameters, the laser power transferred to the corresponding parameters, click the start button, the device automatically detects the roll diameter, automatic hair processing, processing after the end, the hair head automatically returns zero. Can be called a key operation.
At present, the research of laser wool technology mainly focuses on the morphology and distribution control of Maohua pit, the long processing technology, the reasonable utilization of red laser energy and so on. Among them, the distribution control of laser pit is the difficulty of laser hair The development of technology is essential. As the third generation of roll wool technology, laser wool technology is being studied more widely.
- By lasernzh
- On 16/08/2016
At the same time, the United States is still developing ground-based burning laser weapons for anti satellite test. 1997, the U.S. military hit a laser beam successfully for the first time with the mid infrared advanced chemical laser which emitted by the United States Air Force Meteorological satellite. Since then, the United States has repeatedly conducted a similar test. On March 7, 2007, Russia tower season Maria satellite suddenly stop working, Russian space experts doubt, it is damaged by the US at the time of the laser test .
Laser weapon to protect small target
In addition to the heavyweight strategic objectives, the United States has developed a variety of relatively small high energy 30000mw Laser weapons for air defense, base defense and even anti roadside bombs. In air defense and base defense operations, in order to shoot down the aircraft, missiles and shells, the defense side often have to use a more expensive missiles to intercept. And the energy as a "ammunition" of the laser weapon is no such problem. Raytheon developed the solid laser in 2006 and had shoot down incoming 60 mm shells successfully, the United States and Israel jointly developed the mobile theater high energy laser weapon repeatedly in the trial shot down "card Katyusha rocket. In addition, the U.S. Navy worried that terrorists use small vessels to launch attacks on warships. To this end, the company also specializes the ship borne laser weapon, and demonstrates how to use it to attack small vessels.
In recent years, the American war, repeatedly condemned because of harming civilians. The Pentagon believes that the high accuracy of the 200mw Green Laser weapon is expected to allow the United States to get rid of this dilemma. America experts Jeremy Singh said that the NATO air strikes on television Belgrade in 1999, the missile explosion caused 16 people died, but if used laser weapons, it would destroy precise antenna and transmitting equipment to make television paralysis without causing any casualties. Even against tanks so heavily armored targets, tactical laser weapons can also destroy its antennas and other communications and observation system, let the tank becomes "deaf" or "blind". In 2009, Boeing took advantage of a C-130H aircraft carrying high energy chemical lasers to destroy the engine of a ground car to make it break down. Boeing says such an attack would not damage the personnel in the vehicle.
Laser weapons will not be absolutely invincible
Liu Jiangping said that any advanced weapons have their own limitations, although 50mw Laser weapons have a variety of advantages, it will not be absolutely invincible. Because the laser propagation will be affected by the atmospheric disturbance, clouds and other weather conditions, also equipped with laser weapons satellites, aircraft and ship is not perfect, such as aircraft are vulnerable to attack, after these carrying platform are destroyed, laser weapons also cannot play a role. In addition, the existing laser weapons can not work long hours, several times after the launch of a continuous need to re-add energy or cooling, which provides an opportunity for the opponent to attack.
- By lasernzh
- On 04/08/2016
Routh was born
In 2010, the U. S. Navy Surface Warfare Research Center and Cottus company signed a contract worth $11 million, for the development of the solid fiber burning laser weapon system. Cottus company put forward the technical route before various studies funded by the U. S. Navy.
The laser can produce beam source, current laser divided into several major categories of solid state laser device, liquid laser, gas laser, free electron laser. Routh uses the simplest and most inexpensive and reliable fiber laser
There is a strong Russian laser weapon. In view of this laser weapon , the western countries try their best to weaken Russia's nuclear deterrent capability. With the increasing maturity of military space technology, western countries have put the military 100mw Laser Pointer into space. Currently, U.S. spy satellites can detect any corner of the territory of Russia, and with anti missile network construction accelerated,Russia's strategic nuclear missile detection sensitivity and response speed continues to increase, which effectively inhibits the advantage of Russian mobile land-based nuclear power.
Optical fiber laser
In 1988, Shinizi invented the double cladding layer 5000mw Laser laser, this fiber laser has the advantages of small volume, high energy conversion efficiency,(up to 70%) The biggest advantage is that it doesn't need a cooling system.Cottus company using six 5 kW fiber laser, total output power comes to 32 kW, this fiber laser has the advantages of small volume.During 1987 to 1988, the United States Navy conduct a series of shooting test at White Sands test field.They destroyed a supersonic anti-ship missile successfully. At the age of 2000, the United States Navy has developed the "target -1" and "target -2" carrier lasers.
With low energy laser to achieve stable tracking, and then launch high energy laser, about 2 seconds to achieve the time to shoot down.Routh laser short-range defense system has entered the mature stage of developmentThe free electron laser weapon developed by the United States Navy is more complicated, but the prospect is more extensive.
During 1987 to 1988, the United States Navy conduct a series of shooting test at White Sands test field with the world's most powerful laser pointer .They destroyed a supersonic anti-ship missile successfully with a powerful laser weapon . At the age of 2000, the United States Navy has developed the "target -1" and "target -2" carrier lasers.
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