• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A thermochemical scarfing process and apparatus capable of reducing the amount of smoke discharged to the atmosphere and/or of preventing the formation of "secondary" fins when spot scarfing, comprising: (a) scarfing oxygen is directed against a reaction zone of molten metal on the surface of the workpiece to produce a scarfing reaction, and (b) relative movement is provided between the oxygen stream and the workpiece, said reaction forming a molten puddle in front of the reaction zone that grows larger as the cut progresses, wherein the improvement comprises: (c) directing at least one stream of non-reactive fluid to form a fluid, sheet-like curtain that provides a cover over the reaction zone and at least the rear portion of the molten puddle in such manner that said curtain forms a pocket with the surface of the workpiece.
    公开号:SU824883A3
    申请号:SU772546152
    申请日:1977-10-31
    公开日:1981-04-23
    发明作者:Огаст Энджел Стефан
    申请人:Юнион Карбид Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    cutting oxygen is carried out by the relative movement of the product and the cutting stream, and a sheet-like stream of non-reactive substance is inclined to the treated surface by a stream of cutting oxygen.
    Sheet-like flow is fed in the same direction as the jet of cutting oxygen.
    In addition, a sheet-like stream is fed perpendicular to the jet of cutting oxygen.
    The method also uses a water-gas mixture and steam as a non-reactive substance.
    The proposed method is carried out using a device containing a driving gas-cutting head with channels for supplying a jet of cutting oxygen and combustible gas, in which an additional nozzle for supplying a stream of non-reactive fluid is fixed above the holes for supplying cutting oxygen.
    In this case, the flow ports in this nozzle are located either along the longitudinal axis of the gas cutting head or perpendicular to this axis.
    FIG. 1 shows a cutting area on which a bath of molten metal and scale is formed, side view; in fig. 2 - a metal plate on which a section with fins, created using known methods, is cut from above; in fig. 3 is the same section; in fig. 4 - metal plate on which; a plot is cut down using a method and device that prevents primary burrs, but unable to prevent secondary burrs along the cut edges, top view; in fig. 5 - the same section; in fig. b - a metal plate on which a plot in accordance with the invention is cut, top view; in fig. 7 - the same, resolution; in fig. 8 - the proposed device, axonometrics; in Fig. 9, the relative orientation of the water jet and the oxygen jet, side view; in fig. 10 - leaf-like protecting flow, which reduces the amount of smoke released into the atmosphere, but does not prevent secondary burrs, side view; in fig. And the flow that prevents the formation of secondary burrs, but does not reduce the amount of smoke released into the atmosphere, side view; in fig. 12 - a device with a liquid curtain, directed from the side of the workpiece, perpendicular to the oxygen jet, which reduces the amount of smoke emitted into the atmosphere, but does not prevent secondary burrs, top view; on
    FIG. 13 is a cavity-based device for reducing smoke by directing a sheet-like flow in the direction of an oxygen jet, so as to intersect with water jets to remove scale, side view; Fig. 14 shows a device with a cavity for reducing smoke by feeding a sheet-like stream perpendicular to the oxygen jet, so as to intersect with water jets to remove scale, side view.
    The nozzle 1 for cutting the area creates a slice in the direction shown by arrow A of the depth D on the workpiece 2. The primary reaction zone 3 is created between the cutting oxygen stream and the workpiece 2. The byproducts of the hole-cutting reaction are separated from the reaction zone 3, and also from the back of the bath 4.
    A certain amount of molten material from the bath 4 is blown from the reaction zone 3 to the edges of the cut-off area. If the nozzle 1 is of an ordinary round or rectangular shape, the melted drops, thrown aside, subsequently harden again, stick to the workpiece 2 (Figures 2 and 3) along the cut edge 5 of the cut-out 6, and form burrs 7. In addition to formed from metal, the burrs 8 are called secondary.
    FIG. 4 and 5, it is shown how secondary burrs 8 are formed on the surface of the workpiece 2, when a nozzle of a special shape is used, is capable of preventing only the formation of primary burrs. The product is moved in the direction of arrow A. The cut-off of cut-out 9 and 10 at distance d is obtained without burrs, while the rest of the cut is characterized by secondary burrs 8 along the edges of cut 11. However, when the size of the bath in front of the moving forward reaction zone becomes excessively large, parts trays are discarded at the sides of the cut, forming secondary burrs.
    FIG. b and 7 shows a cut 12 with an even outline of the border 13 without burrs, created by cutting down 2 sections on the workpiece to be processed using a special nozzle.
    权利要求:
    Claims (9)
    [1]
    When the device operates, additional water to the nozzle 14, located above the gas cutting head 15, directs a high-pressure water jet onto the product, which is sprayed to obtain a water curtain 16 (Fig. 8). The front part 17 of the bath is cooled, granulated with a water stream 16, and the granulated scale 18 is washed forward. In order to reduce the amount of smoke that enters the atmosphere, the water stream 16 must be wide. at least equal to the width of the reaction zone. Inclined water flow 16 forms a cavity with the workpiece 2 being processed, which captures the rising smoke, absorbing it. In order to prevent secondary burrs, the flow of water 16 must at least have the width W of the molten metal molded to ensure that the front of the tank 17 is granulated across its entire width and washed forward with the high pressure water flow 16. The rest of the bath part 19 is kept small enough to move the oxygen stream forward, but it is large enough to nevertheless provide the necessary preheating of the workpiece 2. Many such nozzles or a type of nozzle with a large number of channels can be used at the site of the nozzle 14 (Fig. 2). An oxygen burner for cutting in the form of a single nozzle 1 (FIG. 9) can be used with the gas cutting head 15. The nozzle 1 directs a stream of oxygen for cutting down in the direction of the axis of the nozzle 1, to the workpiece 2 to form the zone 3 of the reaction of cutting Water onto the curtain, emitted by the additional water nozzle 20, falls to the bath at a distance b before the reaction zone 3 at an angle with respect to the workpiece being prepared .2. The water on the curtain does not fall and should not fall on the reaction zone 3, since this would prevent the punching reaction and could stop it completely. Reducing smoke and preventing secondary burrs can be accomplished using the devices shown in FIG. 8 and 9 by using the following modes of operation; the speed of movement of the cold billet is approximately 9 m / min; depth D is approximately 4.76 mm. In this case, the distance b should be about 35 cm, and the angle oL formed by the water jet and the surface of the workpiece must be between 30 ° and 45®. The manometric pressure of a fluid should be from 8 kg / cm to 11 kg / cm. Water is preferred liquid. The size . bath 4 is not allowed to be longer than the length b. Undoubtedly, because the water on the curtain not only prevents the formation of secondary burrs, but by covering the area above the reaction zone, it also acts as a smoke absorbing curtain. The water jet is supplied so that it intersects with the workpiece 2 in front of the bath 4 (Fig. 10). Here, the water on the curtain reduces the amount of smoke emitted into the atmosphere, but does not prevent the formation of secondary burrs, since the jet of the water curtain does not fall on the bath. However, as long as the water on the curtain passes over the reaction zone with a width at least equal to the width of the reaction zone, the amount of smoke emitted into the atmosphere is significantly reduced. The angle can vary from 0 ° to 60 and still be effective for removing smoke, with an angle of 30 ° being preferred. Airborne mixtures can be used at low pressures, since air tends to spray water, creating a smoother water mist over the reaction zone. Steam or inert gas mixtures such as nitrogen or argon with water also effectively capture smoke. To prevent secondary burrs without significantly reducing the amount of smoke emitted into the atmosphere, the water in the nozzle 20 is positioned in such a way that the liquid stream does not pass over the reaction zone. Effective smoke removal does not occur (Fig. 11). However, since the water on the jet falls on the bath 4 along its entire width, secondary burrs are prevented. To prevent secondary burrs, the angle can vary from 20 ° to 80 °, with an angle of 45 ° being preferred. The preferred fluid pressure is 8 kg / cm. An embodiment of the device that significantly reduces the amount of smoke emitted into the atmosphere (Fig. 12) does not make it possible to prevent secondary burrs. FIG. Figure 13 shows how a dp of smoke trapping can be formed by combining a sheet-like liquid curtain 21 with water jets 22 to remove scale. The liquid curtain can be formed by a plurality of jets supplied by the nozzles on the side of the workpiece 2, perpendicular to the direction of the oxygen jet 23 by means of the nozzles 24 (Fig. 14). Claim 1. A method of thermochemical cleaning, in which a stream of cutting oxygen is supplied to the workpiece and the movement of the product and the cutting stream is carried out with the aim of preventing the formation of burrs, and at the same time, preventing knowledge of the atmosphere by products of stripping; a sheet-like stream of non-reactive substance is inclined to the treated surface above the stream of cutting oxygen.
    [2]
    2. The method according to claim 1, is also distinguished by the fact that the sheet-like stream is fed in the same direction as the jet of cutting oxygen.
    [3]
    h A method according to claim 1, wherein the sheet-like flow is supplied perpendicularly to the stream of cutting oxygen.
    [4]
    4. A method of pop 1, characterized in that water is used as a non-reactive substance.
    [5]
    5. A method according to claim 1, characterized in that a gaseous mixture is used as a non-reactive substance.
    [6]
    6. The method according to claim 1, characterized by a and -s, in that steam is used as a non-reactive substance.
    [7]
    7. A device for carrying out the method according to claims 1-6, comprising a gas-cutting head with channels for supplying cutting oxygen and combustible gas, characterized in that an additional nozzle for supplying a stream of non-reactive substance is mounted on the gas-cutting head above the holes for supplying cutting oxygen.
    [8]
    8. The device according to claim 7, wherein the holes are that the openings of the additional nozzle for supplying a stream of non-reactive substance
    located along the longitudinal axis of the gas cutting head.
    [9]
    9. The device according to claim 7, wherein the axis of the additional nozzle is arranged perpendicular to the longitudinal axis of the gas cutting head.
    Sources of information taken into account in the examination
    1. US patent number 4013486, cl. 148-9.5, 05.22.77.
    2. US patent f 2873224, cl. 148-9.5, 10.02.59.
    3. US patent number 3354002, cl. 148-9.5, 11/21/67.
    4. US patent number 3163559, cl. 134-34, 29.12.64 (prototype).
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    同族专利:
    公开号 | 公开日
    LU78418A1|1978-07-14|
    ZA776208B|1978-06-28|
    SE433577B|1984-06-04|
    AU3019977A|1979-06-28|
    DE2748789A1|1979-03-01|
    CA1103568A|1981-06-23|
    MX147766A|1983-01-11|
    GB1591746A|1981-06-24|
    NO773725L|1979-02-27|
    NL7711959A|1979-02-28|
    BR7707262A|1979-05-29|
    JPS5653461B2|1981-12-18|
    DE2748789B2|1979-08-30|
    FR2400985B1|1982-07-30|
    ATA777477A|1985-04-15|
    HU176172B|1980-12-28|
    SE7712259L|1979-02-27|
    IN147788B|1980-06-28|
    AR214217A1|1979-05-15|
    JPS5435849A|1979-03-16|
    AT379098B|1985-11-11|
    CS205094B2|1981-04-30|
    ES468879A1|1978-11-16|
    ES463752A1|1978-12-16|
    YU260177A|1983-01-21|
    AU511539B2|1980-08-21|
    NO152158B|1985-05-06|
    PL201834A1|1979-07-02|
    DE2748789C3|1982-02-18|
    NO152158C|1985-08-14|
    IT1090241B|1985-06-26|
    TR19979A|1980-06-02|
    BE860373A|1978-05-02|
    YU205282A|1984-02-29|
    PH16020A|1983-05-30|
    YU39827B|1985-04-30|
    FR2400985A1|1979-03-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2218141A|1939-08-23|1940-10-15|Nat Tube Co|Apparatus for removing fumes and solids in metal skinning equipment|
    US2286591A|1940-03-30|1942-06-16|William Van Triest|Method of scarfing|
    US2538074A|1946-05-23|1951-01-16|Air Reduction|Scarfing apparatus|
    DE1287421B|1966-01-15|1969-01-16|Messer Griesheim Gmbh|Device for smoothing the edges of flame-cuttable materials by flaking|
    US3354002A|1966-03-10|1967-11-21|Union Carbide Corp|Thermochemical scarfing method|
    YU159370A|1969-06-25|1977-06-30|Union Carbide Corp|Device for preheating and melting the surface layer of metal blocks|
    DE2356282C2|1973-11-10|1975-01-30|Messer Griesheim Gmbh, 6000 Frankfurt|Device for removing flue gases, slag and the like|
    JPS52149132U|1976-05-11|1977-11-11|JPS55156667A|1979-05-25|1980-12-05|Nippon Steel Corp|Low dust production scarfing blowpipe|
    JPS6139566U|1984-08-13|1986-03-12|
    JPS6239753U|1985-08-30|1987-03-10|
    JPS62200356U|1986-06-12|1987-12-21|
    FR2669568B1|1990-11-26|1995-02-17|Lorraine Laminage|METHOD AND DEVICE FOR MACHINING WITH A TORCH FLAME FOR OXYCOUPTING ELIMINATES OF CRACKS IN SLABS IN A STEEL PLANT.|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/828,204|US4120703A|1975-08-29|1977-08-26|Method and apparatus for reducing smoke and preventing secondary fins during scarfing|
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