Why Use Blades Worktable Cut Acrylic Not Honeycomb Worktable?
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Laser cutting machine commonly used four kinds of laser cutting processing
by：Transon
2021-01-08
Laser cutting is a kind of high energy and density control good non-contact processing way.
After focusing laser beam with high energy density of light, applied in cutting has many characteristics.
And there are four main laser cutting cutting in different ways, in order to cope with different situations.
melting in laser fusion cutting, cutting workpiece after partial melting with the aid of the molten material ejected. Because the material transfer occurs only in the case of the liquid, so the process is called the laser fusion cutting. Laser fusion cutting, of course, is heated to a certain temperature the material melt, and then through the nozzle with beam coaxial gas injection of oxidation, using the pressure of gas liquid metal, form the incision. Laser fusion cutting energy needed for only 1/10 of the vaporization cutting, don't need to make the metal completely vaporized. Laser fusion cutting for iron and titanium metal can get no oxidation incision. Produce gasification and melting but is less than the laser power density, for steel materials, in the 104 W/cm2 ~ 105 W/cm2.
vaporization cutting laser vaporization cutting process, the use of high energy density of laser beam on the workpiece heated, the temperature rise, and in a very short period of time for the material vaporized into steam, when these steam jet will form a incision on material, thus reach the cutting effect. But general material vaporization heat is very big, so the speed of the material surface temperature to the boiling point temperature is so fast, enough to avoid melting caused by heat conduction, so part of the material vaporized disappear into steam, part of the material as the ejecta from the bottom of the kerf width auxiliary gas flow blown away. This case need to be very high laser power. In order to prevent material to steam condensation slotted walls, the thickness of the material must not be larger than the diameter of the laser beam. The processing and therefore only suitable for application in the case of exclude melting materials must be avoided. Laser vaporization cutting materials used in general have a very thin metal materials and nonmetal materials. Under the condition of the plate thickness must be, maximum cutting speed is the material of the gasification temperature. The big 108 w/cm2, laser power density and depends on the material, cutting depth and the beam focus position. Under the condition of the plate thickness must be, assuming that there is enough of laser power, maximum cutting speed is limited by a gas jet speed.
oxidation melting cutting, Laser flame cutting) Melt cutting generally use inert gases, if replaced with oxygen or other reactive gas, was lit materials under the irradiation of laser beam, and the chemical reaction of oxygen violent and produce another source of heat, make further heating material, called oxidation melting cutting. Due to the effect, for the same thickness of the steel, the method can be used to get the cutting rate is higher than melting cutting. On the other hand, this method is compared with fusion cutting may be poorer quality of incision. In fact, it will generate more wide slot, roughness, obvious increase of heat affected zone and the edge of the worse quality. Laser flame cutting on the machining precision model and Angle is bad ( There is a risk of burning Angle) 。
control fracture cutting for easy to heat damage of brittle materials, high speed, controlled by laser beam heating cutting, called control fracture cutting. The cutting process is the main content: laser beam heating brittle material is small area, causing the area of thermal gradient and severe mechanical deformation, cracks leads to the formation of a material. Laser beam may guide so long as you keep balanced heating gradient cracks in any direction. The cutting generally use the material is brittle materials.
melting in laser fusion cutting, cutting workpiece after partial melting with the aid of the molten material ejected. Because the material transfer occurs only in the case of the liquid, so the process is called the laser fusion cutting. Laser fusion cutting, of course, is heated to a certain temperature the material melt, and then through the nozzle with beam coaxial gas injection of oxidation, using the pressure of gas liquid metal, form the incision. Laser fusion cutting energy needed for only 1/10 of the vaporization cutting, don't need to make the metal completely vaporized. Laser fusion cutting for iron and titanium metal can get no oxidation incision. Produce gasification and melting but is less than the laser power density, for steel materials, in the 104 W/cm2 ~ 105 W/cm2.
vaporization cutting laser vaporization cutting process, the use of high energy density of laser beam on the workpiece heated, the temperature rise, and in a very short period of time for the material vaporized into steam, when these steam jet will form a incision on material, thus reach the cutting effect. But general material vaporization heat is very big, so the speed of the material surface temperature to the boiling point temperature is so fast, enough to avoid melting caused by heat conduction, so part of the material vaporized disappear into steam, part of the material as the ejecta from the bottom of the kerf width auxiliary gas flow blown away. This case need to be very high laser power. In order to prevent material to steam condensation slotted walls, the thickness of the material must not be larger than the diameter of the laser beam. The processing and therefore only suitable for application in the case of exclude melting materials must be avoided. Laser vaporization cutting materials used in general have a very thin metal materials and nonmetal materials. Under the condition of the plate thickness must be, maximum cutting speed is the material of the gasification temperature. The big 108 w/cm2, laser power density and depends on the material, cutting depth and the beam focus position. Under the condition of the plate thickness must be, assuming that there is enough of laser power, maximum cutting speed is limited by a gas jet speed.
oxidation melting cutting, Laser flame cutting) Melt cutting generally use inert gases, if replaced with oxygen or other reactive gas, was lit materials under the irradiation of laser beam, and the chemical reaction of oxygen violent and produce another source of heat, make further heating material, called oxidation melting cutting. Due to the effect, for the same thickness of the steel, the method can be used to get the cutting rate is higher than melting cutting. On the other hand, this method is compared with fusion cutting may be poorer quality of incision. In fact, it will generate more wide slot, roughness, obvious increase of heat affected zone and the edge of the worse quality. Laser flame cutting on the machining precision model and Angle is bad ( There is a risk of burning Angle) 。
control fracture cutting for easy to heat damage of brittle materials, high speed, controlled by laser beam heating cutting, called control fracture cutting. The cutting process is the main content: laser beam heating brittle material is small area, causing the area of thermal gradient and severe mechanical deformation, cracks leads to the formation of a material. Laser beam may guide so long as you keep balanced heating gradient cracks in any direction. The cutting generally use the material is brittle materials.
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