Method of laser cutting of metals or alloys

FIELD: process engineering.

SUBSTANCE: invention relates to metal or alloy laser cutting and may be used in various branches of machine building, medicine, etc. Plotted is calibration curve of metal or alloy fraction sprayed by laser radiation at definite power level trapped by fluid, in fact, translucent for laser beam and dependent upon depth of engraved metal or alloy surface in fluid. Then metal to be cut is dipped in fluid to depth defined by said calibration curve. Metal or alloy is penetrated in line of cutting by laser beam. Said laser beam is translated and, at a tone, rotated with radius R. Said radius and angular rotation speed ω are defined from relationship R=d/2-r, mcm and ω>V/2r, kHz, where: D is width of laser beam cutting width, mcm; r is laser beam radius, mcm; V is translation speed, m/s.

EFFECT: higher quality, no harmful effects to environments.

8 cl, 3 dwg

 

The invention relates to methods of processing, namely, the cutting of metal products by the action of the laser radiation. This method may find application in various industries, including engineering, as well as in jewelry and medical fields.

Cutting of metal products by the action of the laser radiation is performed by moving the beam of laser radiation relative to the surface of the product. Performed incision metal products consists of a set of lines of different lengths. The depth of the data lines, which can be obtained per unit of time determines the speed of cutting of metal products and, in practice, is determined by the parameters of laser marking system, laser beam radiation, the movement of the beam relative to the surface of the product. In order to ensure the most rapid incision on this laser marking complex, usually choose the appropriate beam parameters of the laser radiation and the program move the beam of laser radiation relative to the surface of the product. The parameters of the beam of laser radiation, typically, are determined by the technical characteristics of the marking complex, and the program will move the beam relative to the surface of the product may vary by operator practice is Eski arbitrarily. When cutting metal or alloy using a beam of laser radiation, a portion of the material being cut products inevitably evaporates into the atmosphere, worsening the overall environment and threatening the health of the operator of the complex.

The known method of laser cutting a metal plate (see patent US 6060687, IPC B23K 26/00; B23K 26/12 published 09.05.2000), which together with the beam of laser radiation in the region of the cut serves a mixture of at least one inert gas and hydrogen to prevent the formation of burrs and grooves.

For the implementation of this method requires complex technological equipment. Removed by laser radiation the material being cut products partially picked up by the gas in the surrounding atmosphere, which limits the scope of the above areas with forced ventilation.

The known method of laser cutting a metal plate (see application EP 1920873, IPC B23K 26/38; B23K 26/00, published 14.05.2008), namely, that the cutting line repeatedly pass a beam of laser radiation, while in each iteration, increase the depth of the cut slit.

Multiple passage of a beam of laser radiation line of cut, carried out in a known way, significantly reduces the rate of cutting. Removed by laser radiation the material being cut products cha is partially evaporates into the surrounding atmosphere, what worsens the overall ecology and creates a health hazard to the operator of the complex.

The known method of laser cutting metal or alloy (see application DE 102008047761, IPC B23K 26/073; B23K 26/38 published 15.04.2010), which includes a preview build of the calibration curve according to the cutting depth of the sample of a given metal or alloy on the parameters of the incident surface of the laser radiation and penetration of the metal in the cut line of the translational movement of the beam of laser radiation. The diameter of the beam is chosen such that the molten material is removed from the cut without using gas.

The disadvantage of this method is not sufficiently high cutting speed and low productivity of the process. In addition, the material to be cut partially evaporates into the surrounding atmosphere.

The closest to the essential features of the claimed technical solution is the way gas-laser cutting of composite materials (patent RU 2382693, IPC B23K 26/38, B23K 26/14, published 27.02.2010). The method includes applying a laser beam on the workpiece surface, the flow coaxially with the laser beam process gas, callmerobbie laser beam, embedding it in a workpiece, and moving according to a given program. Cutting is produced in a liquid medium. The product is placed in a tub of water on to osobennyh the pins with excess of water level above the surface of the product, equal to 10-15 mm Cutting produce ytterbium laser with the depth of the laser beam in the workpiece by 0.2-0.4 thickness. Moving the laser beam is carried out with a speed of 1.2-1.8 m/min resulting In the expansion of technological capabilities and improving the environment in the processing of composite materials, and also provides a high quality cutting tool products.

The disadvantages of this method are a number of technological limitations. The exclusive use of ytterbium laser is not possible to apply this method on the plants of the previous generation on the basis of neatimage laser (for example, type "Betmarket") or on the basis of carbon-dioxide lasers. Offer in the way of excess water level above the surface of the product is equal to 10-15 mm, limits the application of the method on a laser installations moderate power (for example, 10-20 watts), especially in the CW mode. The method does not allow processing of metal products. Defined in the way the moving speed of the laser beam of 1.2-1.8 m/min is too high to perform heavy-duty cutting of composite materials and/or too low for a fusible. Submission coaxially with the laser beam, the process gas including at pressures up to 1 MPa, its interaction with the composite material may Pref is the relevance to the formation of dangerous to human health or explosive gases, that will lead to environmental degradation and security processing.

The task of the invention was to provide such a method of cutting metal or alloy, which would ensure more rapid incision of the processed material, i.e. most effectively used energy beam of laser radiation and avoid environmental pollution sprayed laser engraving material.

The task is solved by the method of laser cutting metal or alloy includes a preliminary determination of the power density of the laser radiation, which is produced through the cut sample of a given metal or alloy. Then build a calibration curve according to the proportion of the metal or alloy powder by laser radiation with a certain power level, the detainee liquid medium, is virtually transparent to laser radiation, from the depth of immersion in a liquid environment, the surface of the cut metal or alloy. This increases the depth of the minimum value defined by the formation of a film of a liquid medium, completely covering the cut surface, to the depth at which the laser radiation is absorbed in a liquid medium. Then immerse the cut metal or alloy in a liquid environment to a depth defined what about the calibration curve, and proplast metal or its alloy in the cut line beam of laser radiation. While moving the beam of laser radiation translational speed V and simultaneously rotate it with radius R with angular velocity ω and radius R, µ, and the angular velocity of rotation ω, kHz, the laser beam satisfy the relations:

where d is the width of the cutting beam of the laser radiation, mcm;

r is the radius of the beam of laser radiation microns;

V is the velocity of the translational movement of the beam of laser radiation, m/S.

As the liquid medium may be used any substance that, firstly, under the conditions engraving (for example, normal or room) is in a liquid phase state. Secondly, the absorption coefficient of laser radiation that substance is that when a selected thickness of a liquid medium above the surface of the engraving products, the total absorption of the laser radiation does not cause boiling substances, i.e. transition in gas phase state. For example, as a liquid environment, you can use water or hydrocarbon liquid, in particular, mineral oil or alcohol.

Through the cut, you can perform a continuous laser or a pulsed laser with a pulse width of 1 NS to 100 μs.

Through the ez can be accomplished by gradual displacement of the beam of laser radiation with a speed of 0.1 to 100000 mm/S.

The inventive method allows cutting of metal products faster compared to, for example, with traditional progressive movement, which may indicate a higher efficiency of radiation of the laser system when implementing the proposed method, as well as to reduce environmental pollution by keeping a spray of laser radiation of the material being cut products.

A secondary, but no less important was effective cutting of materials with a low coefficient of absorption (primarily gold). It appears that the total for all of the effects cause is re-entering beam of laser radiation on the already irradiated surface as it rotates. The rotation of the beam of laser radiation, thus, can be regarded as a kind of mechanical modulator laser radiation.

The inventive method of laser cutting metal or alloy is illustrated in the drawing, where:

figure 1 is a given schematic illustration of cutting a rotating beam of laser radiation;

figure 2 shows in enlarged scale the area I shown in figure 1;

figure 3 shows the product of dural received harshly by the claimed method.

Figure 1 is displayed: 1 - machined metal or alloy, 2 - line cutting, 3 - trajectory distance of the laser beam irradiation is Oia, 4 - position of the beam of laser radiation at different points in time, r is the radius of the beam of laser radiation, R is the radius of rotation of the beam, d is the width of a cut.

The inventive method is as follows. Using a computer carry out the generation of the program move the beam of laser radiation in accordance with the topology of the performed cut and the desired predetermined thickness d. For effective power consumption of the laser radiation, and also due to the fact that the physical properties of various metals and alloys, the geometrical characteristics of the processed product can vary considerably, pre-determine the dependence of the depth of the cut sample of a given metal or alloy on the parameters of the incident on the surface of laser radiation under monotonic increase of the power density of the laser radiation. To do this, the technological scope of this laser system varies the parameters of the impinging laser radiation. However, in order for all the necessary space inside the cutting line thickness d is exposed to a beam of laser radiation, the parameters V and ω is chosen, taking into account the criteria (1) and (2). Then build a calibration curve according to the proportion of the metal or alloy powder by laser radiation with a certain power level, the detainee liquid medium, is virtually transparent to l is Zernovo radiation, from the depth of immersion in a liquid environment, the surface of the cut metal or alloy. This increases the depth of the minimum value defined by the formation of a film of a liquid medium, completely covering the cut surface, to the depth at which the laser radiation is absorbed in a liquid medium. Immerse the cut metal or alloy in the liquid so that the surface of the metal or alloy were at a depth determined by the calibration curve. Then they cut metal or its alloy 1 (see figure 1, figure 2), propleurae metal or its alloy 1 in the cut line beam of laser radiation, moving the beam of laser radiation translational speed V and simultaneously rotating it with radius R with angular speed ω, the magnitude of which satisfy the relations (1) and (2).

Example. Was made by cutting a plate of 20×50 mm with a thickness of 100 μm, the material - dural. Cutting the outline of the letters "LASER CENTER Saint-Petersburg" (figure 3). Cutting was performed on a universal installation precision laser marking and engraving on the basis of the fiber laser "Minimarket 2" produced by LLC "Laser Center. Moving the laser beam relative to the surface of the product was carried out using a two-axis scanner-based actuators VM2500+. The duration of monopulse laser radiation was 35 which, modulation frequency of 100 kHz, the energy monopulse measured with a pyroelectric sensor Ophir RE 25, of 0.7 MJ, the diameter of the radiation beam on the surface of the product 100 μm. Was previously determined value of the power density of the laser radiation, which is produced through the cut sample of a given alloy. Previously, using a sample of material was constructed calibration curve according to the proportion of the powdered metal or its alloy, detained liquid medium, is virtually transparent to laser radiation, from the depth of immersion in a liquid environment, the cut surface of the alloy. Were selected the following parameters; the speed of the translational movement of the laser beam V=0.2 m/s, the speed of rotation of the laser beam ω=50 kHz. Based on the topology of the engraving image, the radius of rotation was chosen as R=100 µm. Cutting plates medals were carried out in mineral oil at a depth of 7 mm

The time taken to perform this contour cutting, including time on and off the laser beam to move to the next line, amounted to 30 seconds. Thus, the addition of rotation of the laser beam is allowed to perform the desired contour cut more than 8 times faster.

1. The method of laser cutting metal or alloy, including a preliminary determination of the power density of laserdog the radiation, when which is done through the cut sample of a given metal or alloy, the construction of the calibration curve according to the proportion of the metal or alloy powder by laser radiation with a certain power level, the detainee liquid medium, is virtually transparent to laser radiation, from the depth of immersion in a liquid environment, the surface of the cut metal or alloy by increasing the depth of immersion from the minimum value defined by the formation of a film of a liquid medium, completely covering the cut surface, to the depth at which the laser radiation is absorbed in a liquid medium, immersing the cut metal or alloy in the above-mentioned liquid medium to a depth defined by the calibration curve, and the penetration metal or its alloy in the cut line beam of laser radiation, the beam of laser radiation progressive move with velocity V and simultaneously rotate it with radius R with angular speed ω, and the radius R and the angular velocity of rotation ω of the laser beam is determined proceeding from the following equation:
R=d/2-r, µm;
ω>V/2r, kHz;
where d is the width of the cutting beam of the laser radiation, microns;
r is the radius of the beam of laser radiation microns;
V is the velocity of the translational movement of the beam of laser radiation, m/S.

2. The method according to claim 1, characterized in that the quality is the firmness of the liquid environment of the use of water.

3. The method according to claim 1, characterized in that as a liquid environment using hydrocarbon liquid.

4. The method according to claim 3, characterized in that as the liquid medium used is a mineral oil.

5. The method according to claim 3, characterized in that as the liquid environment of the use of alcohol.

6. The method according to claim 1, characterized in that the through-rez perform continuous laser radiation.

7. The method according to claim 1, characterized in that the through-rez perform pulsed laser radiation with a pulse duration of 1 NS to 100 μs.

8. The method according to claim 1, characterized in that the through-cut is carried out by gradual displacement of the beam of laser radiation with a speed of 0.1 to 100000 mm/s



 

Same patents:

FIELD: physics.

SUBSTANCE: method involves making holes in a substrate by moving the focal spot of focused laser radiation and plating said holes. The laser radiation is in form of a cone with a focal spot at its vertex. The focal spot is moved vertically downwards from the upper surface of the board to the lower surface of the board, under which, before piercing, a substrate of electroconductive material which reflects laser radiation is placed. Reflected laser radiation is used when piercing. The holes are then plated via electric gas discharge by applying voltage with one pole to the substrate and another pole to a ring which encircles the laser radiation and which is placed over the printed-circuit board.

EFFECT: simple and faster process of plating laser-pierced holes in a printed-circuit board.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to gas laser cutting of composite materials. Proposed method comprises feeding laser beam to machined surface and process gas, aligned therewith, collimating laser beam, embedding it in machined article and displacing by preset program in the presence of process fluid. Fluid jet is fed as swirled coaxially with laser beam into cutting thermal effect zone. Proposed device comprises laser cutter case wit focusing lens, union to feed process gas, nozzle, and cylindrical vessel with annular channel to feed process fluid. Said annular channel incorporates hollow tapered adapter with inner surface representing helical grooves to swirl fluid flow.

EFFECT: higher quality of cutting.

4 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: this invention relates to cutting of metals by laser. Its use allows expanding operating performances by application of independent operation of two or more laser heads at one machine tool. Laser cutting machine tool comprises: bed 1, at least, one longitudinal guide 2, at least, two transverse guides 3, at least, two laser heads 4 and computer. Every transverse guide 2 is mounted on longitudinal guide 2 for independent displacement while every laser head 4 is mounted on transverse guide 3 for independent horizontal and vertical displacement. Drives of transverse guides and laser heads are connected to computer for independent program control thereof.

EFFECT: six-axis control over laser heads.

1 dwg

FIELD: metallurgy.

SUBSTANCE: laser beam of short-wave laser 1 is directed to reflecting rotary mirror 13, reflecting mirror 14 and, therefrom, into lens 10 on focusing lens 15, and, via central conical nozzle 5, in pulse mode with amplitude equal to thickness of material being cut, into cutting zone 17. Laser annular beam of long-wave laser 2 is directed to reflecting mirror 13 and, therefrom, to focusing lens 10, wherein beam is reflected by annular mirrors 11, 12 and, besides, directed via central conical nozzle 5 into cutting zone 17. Simultaneously, process gas is fed from gas feed system 8 into annular converging-diverging supersonic nozzle 6 with skewed edge 7 at outlet to effuse therefrom onto material being cut.

EFFECT: required cutting depth and high surface quality.

3 cl, 2 dwg

FIELD: metallurgy.

SUBSTANCE: preliminary construction of calibration curve of dependence of cutting depth of specimen of the specified metal or its alloy on parameters of incident laser radiation to surface is performed at monotonic increase in specific power of laser radiation from value of 0.1 J/cm2·s to the value at which through cutting occurs. Then, metal or its alloy is molten-through along cutting line with laser beam by moving the laser beam progressively at speed V, and at the same time its rotation with radius R is performed. Radius R and angular rotation speed of laser beam ω is chosen considering the cut width and radius of laser beam.

EFFECT: high cutting speed at effective use of laser beam energy.

4 cl, 3 dwg, 1 ex

FIELD: process engineering.

SUBSTANCE: invention relates to separation of semiconductor chip surface layer. In compliance with first version, focused laser beam is directed onto chip so that its focus is located at layer separation plane perpendicular to beam axis and displaced to scan layer separation plane in direction of chip exposed side surface and deep down to make continuous cutout. In compliance with second version, focused laser beam is directed onto chip so that focus is located in layer separation plane perpendicular to beam axis and displaced in said plane to produce non-overlapping local regions with disturbed chip structure topology and weakened atomic bonds. Said local regions are distributed over entire said plane. External effects are applied to layer being separated to destruct said weakened atomic bonds.

EFFECT: separation of lateral surface layers from semiconductor crystals.

9 cl, 14 dwg, 12 ex

FIELD: process engineering.

SUBSTANCE: proposed method may be used in nuclear power engineering and other branches of machine building. Proposed method comprises focusing laser beam at material and feeding protective inert gas into cutting zone. Inert gas is fed via nozzle at its outlet pressure of, at least, 3.5·10-5 MPa. Note here that laser beam with wavelength of 1.06-1.07 mcm is used and directed via said nozzle coaxially with its lengthwise axis.

EFFECT: higher efficiency and quality, ruled out metal corrosion.

2 cl, 1 dwg, 2 ex

FIELD: process engineering.

SUBSTANCE: method of moulding cells for vessels or bottles for bottle washing machines. Proposed method comprises the following stages: moulding cell blank 3a from synthetic material and machining it. Said machining includes material removal or dissection to produce structures required for functioning and/or hardening cell 3, and/or for reducing weight of said cell.

EFFECT: higher strength and quality of complex cells.

9 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metal machining by laser beam. Proposed method comprises stages described below First step comprises making first bore with initial diameter and bore axis. Second step comprises displacing laser beam and rotating it about bore axis to produce intermediate bore aligned with initial bore but with larger diameter. Third step comprises displacing laser beam focus along bore axis and finishing said bore by pulsed laser beam.

EFFECT: boring in composite material with ceramic substrate, for example in gas turbine engine combustion chamber or vane.

11 cl, 6 dwg

FIELD: metallurgy.

SUBSTANCE: plate (7) is positioned parallel to first plate (5) and at close distance from it so, that outline of orifice (73a) is located opposite to outline of cut-out orifice (53a). Protective device (10) in form of plate of specific thickness with the third orifice (10a) and with outline set off inside relative to outline of second orifice (73a) is placed between two plates (5 and 7). Further, the first orifice is cut out.

EFFECT: prevention of melt metal hitting second orifice, of deviation of laser beam at cutting and of losses of density of laser beam power output.

7 cl, 4 dwg

FIELD: testing engineering.

SUBSTANCE: device comprises optical quantum generator, system for focusing the laser beam with the unmovable lens, and movable base for securing the object to be cut. The movable base is made of rotating platform mounted on the driving shaft of the mechanism for discrete control of the speed of rotation. The mechanism is made of an assembly of driven and driving pulleys connected by means of the driving belt. The rotating platform is provided with the model of the object to be cut. The driving belt that connects the driven and driving pulleys is made of a vibration insulation material. The driven shaft of the rotating platform is set in bearings, is provided with a mechanism for control of tension of the driving belt, and is mounted on the traverse gear.

EFFECT: decreased time and reduced power consumption of testing.

1 cl, 2 dwg

FIELD: method and apparatus for forming weakening lines in member of automobile lining covering devices with safety cushions in order to create one or more hinged flaps of window for spreading out pneumatic safety cushion when the last is pumped.

SUBSTANCE: method comprises steps of making notch in surface of lining member by means of cutting beam directed from source 12 onto said surface at moving lining member relative to source 12 according to predetermined pattern of notch; tracking cutting result by means of measuring beams irradiated by first pickup 26 and second outer pickup respectively placed in opposite sides relative to lining member 16; combining measuring beam of pickup 26 with cutting beam in such a way that to provide collinear combined segments on surface of lining member and to direct them constantly to the same points of notch pattern; controlling quantity of material removed by means of cutting beam in each point along pattern due to controlling notch cutting process with use of feedback signals generated by first 26 and second 20 pickups. Apparatus for performing the method includes source of cutting beam for making notch on surface of one side of lining member at directing cutting beam to said surface; drive unit imparting mutual relative motion of cutting beam source and lining member according to predetermined pattern; sensor unit for tracking thickness of remained material of lining member; device for combining beams; control unit for tracking process of cutting notch in each point along predetermined pattern and regulating cutting intensity of cutting beam for providing predetermined thickness of material of lining member. Sensor unit includes first inner pickup 26 and second outer pickup 20 arranged at mutually opposite sides of lining member 16 and directed towards each point of lining member to be notched. Inner pickup and cutting beam source are arranged at the same side relative to lining member.

EFFECT: possibility for making weakening lines during one pass at accurate reproducibility regardless of variation of cutting depth, cutting angle, patterns of notch, non-uniformity and color of material, texture of material surface and so on.

41 cl, 8 dwg

FIELD: different branches of machine engineering and metallurgy, possibly working products for modifying or preparing topography of article surface or raw materials.

SUBSTANCE: method comprises steps of relatively moving article and powerful beam in crossing direction in order to act upon several positions on article by means of said beam; at each position moving beam relative to article according to predetermined way; melting material of article and moving it by action of powerful beam for forming recesses or openings; joining article having prepared surface with target part. Product formed by such process has predetermined surface roughness.

EFFECT: possibility for producing article with predetermined surface roughness.

46 cl, 11 dwg, 1 tbl

FIELD: laser working, namely laser cutting, possibly in machine engineering for effective and high-accuracy manufacture of complex-contour parts from sheet blank.

SUBSTANCE: method comprises steps of measuring mean statistic value of limit bending of blank 7; then fastening and tensioning blank at providing tension stresses determined by relation: σtχ ≤ σe GV, where σt - tension stresses created in blank, MPa; χ - thermal conductivity of blank material, mm2/s; σe - elastic limit of blank material, MPa; G - mean statistic value of limit bending of blank, mm; V - cutting speed, mm/s. Focused laser irradiation 1 with preset focal length and gas flow 6 are fed onto sheet blank 7 through nozzle of cutter 5 for moving blank along predetermined contour. Apparatus includes source of laser irradiation 1, mirror 3, cutter 5, platform 8 with clamp 9 for blank 7. Platform 8 is mounted on coordinate table 11 and it includes threaded guides 10 for tensioning blank; said guides are in the form of screw gages with left- and right-hand threads. Coordinate table is number program controlled by system 12 connected with laser irradiation source 1 and with information-computing system 13 through program module 14 correcting contour of cutting in proportion to deformations created in material.

EFFECT: enhanced accuracy of laser cutting due to stable position (on the whole surface of sheet blank) of plane of focusing lens of cutter at cutting process, practically constant gap value between nozzle of cutter and blank surface.

2 cl, 1 dwg, 1 ex, 1 tbl

FIELD: processes and equipment for gas-laser cutting of titanium and its alloys, possibly in different branches of power engineering and machine engineering.

SUBSTANCE: method is realized due to using technological gas being mixture of argon and oxygen and containing 15 -25% of oxygen. In order to cut metal of predetermined thickness, oxygen content in technological gas is determined depending upon cutting speed and quality of metal surface according to technological demands for cutting quality at maximally admissible cutting speed.

EFFECT: improved quality of cutting as oxygen content of technological gas in preset range completely prevents occurring of type-metal or makes it rare and small.

1 dwg, 1 ex

FIELD: physics; lasers.

SUBSTANCE: present invention pertains to laser technology, particularly to the method of cutting pyrographite using laser, and can be used in instrument making, and mainly in electronics. Laser radiation with central mode TEM00 is focused on the material. The focus of the beam is directed on the surface of the material, while keeping the density of the incident power within the 106-107 W/cm2 range. The work piece is moved at speed ranging from 1 to 3 mm/s. The cutting process parameters are determined by the expression , where K is the coupling factor of parameters, chosen from the condition 7·10-5≤K≤12·10-5; f is the repetition frequency of the laser radiation, τ is the pulse duration of the laser radiation, d is the diameter of the spot of focused laser radiation, and h is the thickness of the work piece. A laser with yttrium aluminium garnet active element, with controlled distribution of power in the section of the beam is used.

EFFECT: high quality of cutting material with a smaller heat affected zone during optimum process modes.

2 cl, 1 ex

FIELD: technological processes.

SUBSTANCE: cutting of sheet materials is realised with the help of cut sheet surface exposure to oxygen jet that flows from supersonic nozzle and laser radiation. Laser radiation is focused so that axis of beam coincides with the nozzle axis, beam focus is located inside the nozzle, and beam diameter on surface of cut plate exceeds output diameter of nozzle. Beam heats the metal to the temperature that is higher than burning temperature but is lower than melt temperature. Thickness of cut sheets is set by condition H/Da≤(0.8-1.2)P/P+5, where H is thickness of cut sheet, mm, Da is output diameter of nozzle, mm. Certain selection of cutting parameters, namely value of pressure in nozzle chamber and gap size between output section of nozzle and cut sheet, makes it possible to increase quality of cutting surface. Selection is done based on the following conditions: P/P=6.15/(D0/Da-A)-7.7 and δ/Da=1-2, where P is excess gas pressure in chamber, MPa; P is pressure of environment, MPa; A=0.2-0.3; D0 is critical diameter of gas nozzle, mm; Da is output diameter of gas nozzle, mm; δ is gap size between output section of nozzle and sheet surface, mm.

EFFECT: higher quality of cutting surface.

1 ex, 3 dwg

FIELD: agriculture.

SUBSTANCE: device includes bearing structures interconnected with gear-driven means for processing element relocation and program control system. Bearing structures are made as a support and means for processing element relocation is made as a rotary lever system including at least two levers being interconnected by one end with each other by means of hinge joint. The second end of the first lever is connected by means of hinge joint with support and the second end of the second lever has processing element mounted thereon. Another version includes bearing structures interconnected with gear-driven means for processing element relocation and program control system. To achieve the same technical result bearing structures are made as a support capable to move along guide ways, means for processing element relocation is made as a rotary lever system including at least two levers being interconnected by one end with each other by means of hinge joint. The second end of the first lever is fixed rigidly to the support and the second end of the second lever has processing element mounted thereon.

EFFECT: extension of manufacturing capability and increase of positioning accuracy.

10 cl, 4 dwg

Gas-laser cutter // 2368479

FIELD: process engineering.

SUBSTANCE: proposed device comprises focusing lens (1), casing (2), branch pipe (3) for laser beam to pass there through at preset aperture angle and nozzle (5) arranged around aforesaid branch pipe and inclined to the lens optical axis to form gas supersonic jets. Branch pipe (3) has annular grooves (4) to make chamber for gas to be distributed between the nozzles. Axes of nozzles (5) intersect the lens axis at the point which makes that of intersection between processed surface and focusing lens axis to exploit entire kinetic power of supersonic jets onto processed surface.

EFFECT: higher efficiency of processing due to increased efficiency of gas mix effects.

1 dwg

FIELD: technological processes.

SUBSTANCE: invention is related to method and device for automatic control of laser cutting or hole drilling process. Method includes measurement of radiation reflected from zone of processing. Minimum value of reflected radiation amplitude is defined, compared to specified amplitude, and control of laser radiation capacity and/or cutting speed are controlled. Device comprises laser with power supply unit, rotary mirror, focusing lens, 2-coordinate table for fixation of processed part, unit of 2-coordinate table control, photodetector of secondary radiation and transformer of secondary radiation signal from photodetector, connected to unit of laser power supply and unit of 2-coordinate table control.

EFFECT: improved quality and capacity of through laser processing of materials.

2 cl, 1 dwg

Up!