• 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:
    The present invention relates to the thermochemical scarfing of metal workpieces. The present invention seeks to provide a method for scarfing the surface of a metal workpiece that provides acceptably short preheat times for scarfing relative cold workpieces without being subject to flashback and without requiring adjuvant material. In accordance with the present invention post-mixed scarfing pre- heating flame is produced by discharging fuel and oxygen from separate ports to impinge forming acute included angle. The flame is stabilized with a low-intensity stream of oxygen, directed in same general direction as the flame, close to but not passing through the point of impingement. <IMAGE>
    公开号:SU988178A3
    申请号:SU782671649
    申请日:1978-09-25
    公开日:1983-01-07
    发明作者:Элмер Фурхоп Рональд
    申请人:Юнион Карбид Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to a thermal and chemical removal of the surface layer of a metal billet, called fire treatment. More precisely, this invention includes a method and a device for preheating the surface of a metalworking billet for firing treatment, which can be used in stripping billets in a metallurgical industry. Full cycle of fire treatment. Usually consists of three stages: 1) installation of the workpiece in the fire treatment unit, 2) preheating the workpiece to form a bath of molten metal, and 3) performing fire treatment with an oxygen jet during relative movement of the workpiece and the fire treatment unit or nodes. This invention relates to the axle preheating stage. Methods are known for preheating. In these methods, preheating is carried out by a torch, which is formed by mixing oxygen and gas: the gas in the burner and igniting it at the exit of the burner. The problem of mixing oxygen and combustible gas. The burner, referred to as pre-mixing, is that an explosive mixture causes a reverse ignition, i.e., ignition inside the burner, which can destroy the burner and is dangerous. Advanced pre-mixing is carried out in a method in which oxygen and a combustible gas are mixed immediately before exiting Nozzle 2, Despite this improvement, in devices all can be ignited again. If the outer part of the nozzle is closed, for example, with spattered metal, while oxygen and the fuel holes have an outlet to the inside of the assembly, an explosive mixture is created that can cause a reverse clamping, the preheating device is used with the subsequent mixing ulovitelstrui oxygen in order to reduce the firing time obrabotkiGz. However, this device does not allow the processing of cold billets. In the method of instantaneous start of fire treatment, the time required for the preliminary heating of the workpiece is practically reduced to zero. The method is effective, however, it requires a bar feeder and a high intensity of the jet of oxygen that is not required for the present. Therefore, the present invention has the advantage in the case that it does not require an instantaneous onset of fire treatment. cold metal processing is desirable. There is also known a method in which the preheating of the surface of the workpiece is performed to a temperature equal to the ignition temperature of the oxidizing gas by a heating torch formed by jets of combustible and oxidizing gas supplied through the holes in the head at an acute angle to one another, then carried out relative displacement between the stream of oxidizing gas and the surface of the workpiece and the treatment of the workpiece with a stream of oxidizing gas, also supplied through an opening in the head 3. It is also known a device containing RDCCH the outer and inner preheat blocks in which are made holes disposed at an angle to the hearth chi fuel and the oxidizing gas before preliminarily heating and openings for supplying the oxidizing gas to be processed, as well as the reference shoe. However, this method and device does not allow for sufficiently high performance. The present invention allows for rapid preheating of a part of the surface of a relatively cold metal billet to the temperature required for firing, using a torch, without danger of re-ignition, without using rods, a high-intensity burner, etc. The purpose of the invention is to increase productivity by reducing time preheating the surface of the part. This goal is achieved by the fact that, according to the method of thermomechanical processing of metal blanks wherein preheating of the preform surface is performed to a temperature equal to the ignition temperature of the oxidizing gas by a heating torch formed by jets of combustible and oxidizing gases delivered through the openings in the head at an acute angle to each other, and then carry out a relative movement between a jet of oxidizing gas, and the surface of the workpiece and the treatment of the workpiece with a jet of oxidizing gas, also fed through the holes in the head, the flame of the preheating is stabilized by a jet of oxidizing gas that is lower than the oxidizing gas flow rate used to process the blanks, while the stabilizing jet is fed in the direction coinciding with the direction of the preheating plume or making an angle of 10-90 with the resulting vector of combustible and oxidizing gas jets and through the point intersections of the fuel and oxidizing gas jets forming the heating plume, or near this point. A jet of oxidizing preheating gas is supplied at an angle of 5-50 ° to the jet of combustible gas. The consumption of combustible gas. Preheating is 1-3.5 m} h, the oxidizing gas is 1-6 m / h, and the stabilizing gas is 3-10. Oxygen is used as the oxidizing gas to form the heat plume. An oxidizing stabilizing gas and an oxidizing gas for processing workpieces are supplied from the same head hole. These drawbacks are also eliminated in the device comprising a head with external and internal preheating blocks, in which angled apertures for supplying combustible and oxidizing preheating gases, and an opening for supplying an oxidizing gas for treatment are provided. These drawbacks are eliminated due to the fact that the device is equipped with a node for supplying a stabilizing oxidizing gas jet, mounted on the head and containing an opening for supplying said jet with an axis passing through the point of intersection of the axes of the preliminary fuel supply and oxidizing gases. heating or near this point. The axis of the opening for supplying jets of stabilizing oxidizing gas is placed at an angle of 10-90 ° to the resulting vector between the axes of the holes for supplying jets of combustible and oxidizing gases. The angle between the axes of the fuel supply and the oxidizing gas preheating is 5-50 °. The opening of the day the supply of stabilizing oxidizing gas is made in the external preheating unit and is placed between the opening. for the supply of combustible preheating gas and an opening for supplying the oxidizing gas for processing the workpiece, while the axes of the opening for supplying the stabilizing and oxidizing gas for the processing of Parallel. Fig. 1 shows a firing device, side view; in figure 2.- section. Aa on figl; FIG. 3 shows a device, a large scale; in fig. 4 — placement of the bath of molten metal relative to the oxygen stream of firing treatment at the processing site on the flat part of the working surface; in fig. 5- edge of the surface, the initial processing phase; FIG. 6 shows comparative graphs of the preheating time of the working surface 6 for the proposed and known methods / FIG. 7, where the preheating jets are discharged from the bottom of the unit, in FIG. 8, the device having a separate opening of stabilizing oxygen and oxygen for processing is a side view of FIG. 9 is a section bB of FIG. 3 in FIG. 10 shows the device shown in FIG. eight ,. front view; in fig. 11. A device having separate channels for stabilizing oxygen treatment, in which the stabilizing and warming jets are connected in one place, side view; Fig. 12 shows the device shown in Fig. 3, in which the flows of the stabilizing and warming streams are connected in the same place, side view; in fig. 13 - a device in which the stabilizing jet is directed approximately to the impact of the warming jets, but not in the direction of the torch, side view; in Fig. 14, the device shown in Fig. 13, in which the stabilizing flow passes through the collision point of the warming flows, side view. Figures 1, 2 and 3 illustrate the preferred construction of the invention for carrying out the processing method. The fire treatment unit includes an outdoor preheating unit 1, an indoor unit 2, a head 3 and a shoe 4. Blocks 1 and 2 are called pre-heating units, as the heating torch is produced in the usual device of these blocks. However, Figures 1, 2 and 3 illustrate a device in which only flares ejected from an outdoor preheater unit are used for preheating. The rear hole 5, from which the oxygen jet for fire treatment is discharged as a flat jet, is formed by the bottom surface 6 of the outdoor preheating unit 1 and the top surface 7 of the lower preheating unit 2. The internal preheating unit 2 has a series of gas passage openings for which gas 8. Oxygen and combustible gas flows to the head 3 through tubes (not shown and then to the corresponding gas passages. The shoe 4 moves along the surface of the workpiece W during firing treatment in order to maintain the firing hole at a constant distance. Z (FIG. 3) from the working surface. The firing treatment is carried out as a result of striking the molten metal with a flat flow of oxygen from the firing treatment released from the hole. 5 at an acute angle to the working surface, while the fire treatment unit moves relative to the workpiece. The external preheating unit has a number of holes 9 for combustible gas and a number of holes 10 for preheating oxygen, a passage to each of the said holes (not shown for supplying gas and oxygen, respectively. Oxygen orifices are located above the combustible gas holes, and the reverse arrangement of these holes is possible, although this is less preferable. In general, it is preferable to arrange the oxygen heating holes between the combustible gas holes and below the stabilizing oxygen hole. The method is carried out as follows ... The preheating oxygen jets 11, emerging from the opening 10, and the preheating gas jets 12 combustible 9, leaving the opening 9, collide to form a combustible mixture. Clash pr-. ISOTING at point 13 (FIG. 3K. As a result of ignition, a flare 14 is formed, having a low intensity and a high intensity zone 16. The high intensity zone 16 can be stretched so that its tip 17 is above the surface of the workpiece, thereby creating even more efficient a torch, and stabilization of the pre-heating torch was achieved by the arrival of a low-intensity oxygen jet that passes almost to the collision point 13 and in the same direction as the torch 14. The passage of the low-intensity jet 18 to almost Incarnation means that the jet must pass close to point 13, but not through it. It should be borne in mind that the term “collision point” is more accurate than the collision point, since there is an intersection of st therefore there are many collision points and Since the jet has a thickness, a certain area, and not just a point, is obtained in cross section. Thus, the brief term collision site used in the description essentially means a certain area of collision of the flow of fuel and oxidizing gas. The source of the stabilizing oxygen jet iS is hole 5. To obtain a jet of low intensity (lower than the flame treatment oxygen jet), it is used. A conventional valve is not shown). The jet 18 should be directed to a point in the same direction as the torch and, if the jet were placed 18 times on the components parallel and perpendicular to the torch direction, a vector parallel to the torch would be directed in the same direction as the torch . Combustible gas and acid jets should collide at an acute angle, i.e. more than 0 but less than 90. The preferred angle interval is 5-15 °, and the most preferable angle is 15 °. The strut 18 of stabilizing oxygen from the opening 5 should have a low intensity, i.e. have a lower speed than the preheating oxygen and the combustible gas from the holes 10 and 9. Preferably, the stabilizing flow rate should be about 0% of the speed of the preheating jets. If the heating torch were not stabilized as described, the zone-high intensity (from point 13 to tip 17) would be so short that the heating phase could not be completed in an acceptable short time without decreasing the distance 7 Reducing the distance Z for transferring the tip of the high-intensity zone of an unstabilized flame causes damage to the flame treatment unit from splashing metal and slag. . The flares of combustible gas from the lower orifices 8, mixed with oxygen from the orifice 5, are used to support the fire treatment process. These torches are not needed during heating, but combustible gas flows out of the holes 8 during heating to prevent their blockage. After the molten metal bath is created, the valve controls the intensity of OXYGEN from the hole 5, and the relative movement of the workpiece and the processing unit begins. This is how the processing is carried out. During the fire treatment, the heat plumes formed by the jets 11 and 12 are switched to a lower intensity than during the heating time to support the fire treatment process. The screen 19, located above the preheating holes 9 and 10, is used to prevent the low-intensity flare from blowing up during the firing treatment. An example (parameters of the method), Gf is the angle between the direction of oxygen supply of the firing treatment and the surface of the bogging -35 °; X - hole width 5 - 5.6 m; 2 - the distance from the hole 5 to the surface being treated is 25 mm; V is the width of the fire treatment unit (Figures 2 - 270 mm; Type of combustible gas — natural gas; Type of oxidizing gas — oxygen. FIGS. 7-14 illustrate embodiments of the invention. FIG. 7 is a side view of the fire treatment unit, which is similar to that shown in FIGS. 1, 2 and 3, except that the openings 10 and 9 of the preheating of oxygen and combustible gas are located respectively in the internal preheating unit 2. The device works in the same way as the device in FIG. and 3, FIGS. 8 and 9 provide a structure in which stabilizing This oxygen is supplied separately from inlet 5. Thus, the preheating oxygen 11 from the orifice 10 blows into the jet 12 of the preheat combustible gas from the orifice 9 to form a flare 14. Then the torch is stabilized by a low intensity oxygen jet 20 from the nozzle orifice 21 directed near the collision point 13 and in the direction of the flare. Holes 9,10 and 21 are located in the external preheating block 1. They can also be located in the internal block. After the preheating is performed, the jet of oxygen from the flame treatment from the hole 5 starts the processing of the workpiece, as described above, the combustible gas leaving the hole 8, supports the flame treatment process. Fig. 10 repeats the structure shown in Fig. 9, except that the stabilizing oxygen is discharged from the longitudinal slit-shaped nozzle 22. Oxygen and combustible preheating gas can also be supplied from the longitudinal slit-like nozzles, although this design is not preferred. .
    FIG.1L. is a side view of a device having stabilizing oxygen apertures 21 separate from apertures 5, like FIG. 8. However, the stabilizing oxygen jet 20 passes through the stand of the 13 of the jet 11 of the preheat oxygen 11 and the jet 12 of the combustible preheating gas. Screens 19 and 23 do not necessarily need to increase the limit, the cBboite of which the flow of heated and stabilized jets can be changed, thus a stabilized torch is obtained. If the hole of combustible gas is not located between the holes of the preheating and stabilizing its oxygen, the screen located close to the hole of the central gas is especially useful.
    Fig. 12 is a side view of a device in which stabilizing oxygen and treatment oxygen is expelled from aperture 5, as in the device shown in Fig. 3. However, in FIG. 12, stabilization oxygen passes through the table above the warming jets. This device, although not preferred, is also capable of creating a stabilized heating torch, while the collision point 13 is located above the workpiece (not shown).
    Fig. 13 is a side view of the device in which the direction of the stabilizing oxygen jet 20 does not coincide with the direction of the torch. Thus, the preheating oxygen jet 11 and the combustible preheating gas jet 12 collide at point 13, as described, to form a torch 14.
    Fig. 14 is a side view of a device similar to the device shown in Fig. 13, except that the stabilizing oxygen jet 20 passes through the collision site of the heated jets. This design is also operable.
    The device works as follows.
    From the holes 9 and 10 serves, respectively, a stream of oxygen and combustible preheating gas. The jets collide with a combustible mixture. The collision occurs at point 13. Then from the hole 5 (Fig.Z) or 21 (Fig. 8), 11-14, or the slit 22 (Fig.10) serves a stream of stabilizing oxygen of low intensity. After the preheating is completed, a stream of oxygen is supplied from the opening 5 and the processing of the workpiece is started. .
    Table 1 presents the ranges and. preferred parameter values for devices with technical
    parameters presented in example 1.
    The preferred shape of the holes 9 and 10 is a circle, but other configurations are possible. For example, the holes may be square or rectangular. A single oxygen nozzle and a single combustible gas nozzle may be used, but this is undesirable. The invention works best if you use a lot of oxygen holes and holes for combustible gas "located in rows opposite each other (Figures 2 and 101
    The Kazkdou oxygen port 10 is located directly opposite the orifice of the gas 9.
    The angle of the torch 14, i.e.
    the angle formed by the axis of the flare 14 and the plane of the workpiece X / must have a value in the range of 40-55 and a coordinate of 2. equal to 25 mm. If the angle exceeds 55 ° the flare tends to be food
    put a notch in the workpiece. if the angle is less than 40, the tip 47 of the high-intensity zone 16 is too far from the working surface to provide heating in a short
    time The angle of the torch is determined by the value of the parameters listed in Table 1 and Example 1.
    Fire processing begins on the upper surface of the workpiece (Fig. 4) on the device, which has the parameters
    the data in the example and the preferred parameters from table.1. The results of the studies are graphically shown by the curve X in Fig. 6, in which the initial temperature (T C) of the workpiece is plotted on one axis, and the required time in seconds of heating (i. °) on the other.
    .-
    For comparison, the curve characterizes the results obtained on the device. The Sz A Curve .2 characterizes the results obtained on the deviceSetS.
    As follows from FIG. 6, for a cold billet, the present invention has significant advantages of ng1D with existing devices, since the preheating time is shorter than twice at a billet temperature above 200 C. At a billet temperature below 200 ° C, the device of the invention requires significantly less time (less than twice). The graph shows that the capture of oxygen by method 3 does not allow to obtain a preheating time less than 20 s for preparation having a temperature lower, whereas the method of the present invention requires a mea than 20 s for heating the preparation having a temperature. Example 2 (according to FIG. IL. A stabilized torch followed by mixing is obtained by mixing two jets of preheating and a stabilizing jet in one place. Table 2 shows the working interval and the preferred value of the parameters used. As in Table 1, the parameters are interrelated. Deviation from the preferred value of one parameter can change the working interval and the preferred values of the two parameters. The preferred values of the parameters not listed in table 2 are similar to those in table 1. Example u. 13) Table 3 are the working yn interval and preferred values for the device according to Figure 13. As in the previous case, the values of the parameters are interdependent. Changing one of the parameters may change the interval of others. The preferred values of parameres are not listed in Table 3 are similar to those in Table 1. The reduction in preheating time is carried out as follows. It has been observed that an unstable torch followed by mixing, formed by the collision of combustible gas and preheating oxygen, tends to a relatively large zone of low intensity and a very small zone of high intensity. In some cases, a zone of high intensity cannot be distinguished. In addition, an unstabilized torch followed by mixing tends to unstable oscillations. If the intensity of the unstabilized flame is increased by increasing the flow rate of the gas and oxygen of the preheating, the oscillation becomes more pronounced. Eventually, the unstabilized torch is blown away from the preheating holes by the increased gas flow and goes out. Screens have been found to help hold a torch and allow higher gas flow rates. When the torch with subsequent mixing is stabilized in accordance with the invention of a low-intensity oxygen jet, stabilized, the torch very quickly increases in length, the zone of high intensity increases and the oscillation stops. The torch remains stable, even if the consumption of combustible gas and preheating oxygen is increased more than in the case of an unstabilized torch. The beneficial effect of the stabilizing jet, especially when it is directed, as shown in FIG. 3, is explained by the following factors. Since the stream of stabilizing oxygen has a low intensity, it does not interfere with the external mixing of the streams of oxygen and the preheating gas. However, it adds oxygen, which helps sustain combustion and nourishes the high intensity flame zone with oxygen. This oxygen atmosphere creates the best environment for the flame to move the ignition of unburned gas back to the outlets. The stabilizing oxygen jet is also from air, which is significantly worse than oxygen and causes flame instability. Table 1
    The diameter of the hole 9 combustible gas heating, mm
    Discharge of combustible gas through
    oh gag
    The interval between the openings of the combustible gas (value Y in Fig. 2), mm.
    The diameter of the oxygen hole 10 mm
    Oxygen consumption through one hole, Much
    0.7-1.7 1-3.5
    3-16 1-2.3 1.5-6
    The interval between the holes of oxygen (the value of Y in figure 2), mm
    (. The angle between the axes of the holes of the state gas and oxygen (angle D in FIG. 3
    Distance 24 between surface 6 and holes of combustible gas, mm
    ANGLE between the axis of the heating oxygen orifice and the workpiece (angle H in FIG. 3), gra
    Distance 25 and 26 from collision point 13 to heating hole, mm
    Distance 27 between d} dami holes 9 and 10, mm
    Consumption of stabilizing oxygen from the hole 5 during the firing process, Parameter I Prev Angle C (11), hail Hole stabilizing oxygen 14 diameter 5, mm flow, m / h Parameters I
    Distance from collision site 13 to. openings of stabilizing oxygen, mm.,
    Hole stabilizer oxygen 5
    diameter, mm flow, m / h Angle A, hail
    Continued table. one
    I
    3-16
    5-50
    3-15
    40-75
    3-22
    1.5-6
    3-10 I I
    3-22
    1-66 1-4 10-90 j Table 2 respectful I Working value I interval 255-90 21-6 1,31-4 Table 3 Preferred I Working value interval
    权利要求:
    Claims (9)
    [1]
    1. A method of thermochemical flame treatment of metal workpieces, according to which the surface of the workpiece is preheated to a temperature equal to the ignition temperature of the oxidizing gas by a heating torch formed by jets of combustible and oxidizing gases supplied through the holes in the head at an acute angle to one other and then relative movement between the stream of oxidizing gas and the surface of the gas
    and treating the workpiece with a jet of oxidizing gas, also supplied through a hole in the head, about aphid and so that, in order to increase productivity by reducing the preheating time of the surface of the part, the heat torch is stabilized with a jet of oxidizing gas, the flow rate lower than that the oxidizing gas used to process the workpieces, with 3TOi-i a stabilizing jet is fed in the direction coinciding with the direction of the preheating plume or constituting an angle of 10-90 with the resulting vector jets of combustible and oxidizing gases, and through the point of intersection of the jets of combustible and oxidizing gases forming the heating plume, or near this point.
    [2]
    2. The method according to claim 1, 1, and that the jet of oxidizing preheating gas is fed at an angle to the jet of combustible gas.
    [3]
    3. Method according to PP.1 and 2, about t l and. This means that the consumption of combustible preheating gas is 1-3.5, the oxidizing preheating gas is 1-6, and the stabilizing gas is i 3-10.
    [4]
    4. A method according to claims 1 to 3, characterized in that oxygen is used as an oxidizing gas to form a heat plume.
    [5]
    5. The method according to claims 1-4, of which there is an example that the oxidizing stabilizing gas and the oxidizing gas for processing the workpiece are supplied from
    The same hole in the head.
    [6]
    6. A device for thermochemical flame treatment of metal workpieces, comprising a head with an external and internal preheating blocks, in which angled holes for supplying fuel and oxidizing gases of preheating are made, and an opening for supplying oxidizing gas for treatment, differing from that the device is equipped with a unit for supplying a stabilizing oxidizing gas jet, mounted on the head and containing an opening for supplying a stabilizing oxidizing gas jet with an axis passing through the point of intersection of the axes of the holes for supplying fuel and oxidizing gases of the preheating or near this point.
    0
    [7]
    7. The device according to p. 6,0 t l ich and This is due to the fact that the axis of the hole for supplying a stabilizing oxidizing gas is located at an angle of 1090 ° to the resulting vector between
    5 axes of openings for supplying jets of combustible and oxidizing gases.
    [8]
    8. A device according to Claims 6 and 7, differing in that the angle between the axes of the openings for supplying thrusters and oxidizing preheating gases is 5-50 °
    [9]
    9. The device according to paragraphs. 6-8, in which the opening for supplying a stabilizing oxidizing gas is made in the outdoor preheating unit and placed between the openings for supplying a combustible preheating gas and the opening for supplying the oxidizing gas for processing the workpiece, with the axis stabilizing gas supply and oxidizing gas treatment openings are paralleled.
    Priority on paragraphs 26.09.77 on PP.2-5 and 7-9. Clauses 1 and 6 of the formula have a dual priority basis.
    09.26.77p. On supply of a jet of stabilizing, oxidizing gas
    through the intersection point of the jets 1: heating and oxidizing gases of preheating.
    03.06.78po Clause 1 - when a stream of stabilizing oxidizing gas is supplied
    near the point of intersection of the jet of fuel and oxidizing preheating gases.
    09.26.77 fto p.6 at the intersection
    the axes of the opening for supplying a stabilizing oxidizing gas to the point of intersection of the axes of the openings for supplying fuel and oxidizing gases to preheating.
    . 03.06.78 according to claim 6, when placing the axis of the opening for supplying a stabilizing oxidizing gas near the point of intersection of the axes of the openings for supplying fuel and oxidizing gases to preheating.
    Sources of information taken into account in the examination
    1: US Patent No. 2,267,405, Cl. 148-9. 12/23/41. 2. The patent of the USA 2356197, kl.266-23,22 .08,44. 3. The patent of the USA 3752460, cl. At 23 K 7/00, 08/14/73. 4. Patent of the USA About 3966503, cl. At 23 K 7/08, 06/29/76. 5. US patent N-3231431, cl.148-9,5, 25.01.66 (prototype).
    D1D 7 FIG. 2
    J
    k.
    W
    oooooosk 9 oh oh oh oh oh
    -22 О О О О О О ОО ОФи8 .10
    类似技术:
    公开号 | 公开日 | 专利标题
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    US4243436A|1981-01-06|Instantaneous scarfing by means of a pilot puddle
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    US3895906A|1975-07-22|Heating process and apparatus using oxygen
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    同族专利:
    公开号 | 公开日
    ES473632A1|1979-04-16|
    SE453575B|1988-02-15|
    SE437947B|1985-03-25|
    IT7851232D0|1978-09-25|
    HU176173B|1980-12-28|
    FR2403860B1|1984-04-27|
    YU172682A|1985-06-30|
    NO147904C|1983-07-06|
    RO77452A|1981-11-04|
    TR20332A|1981-02-16|
    JPS5811305B2|1983-03-02|
    BR7806291A|1979-04-17|
    NO147904B|1983-03-28|
    DE2841704B2|1980-10-09|
    NL7809695A|1979-03-28|
    AR217710A1|1980-04-15|
    AU518655B2|1981-10-15|
    DE2841704A1|1979-03-29|
    ES476037A1|1979-06-16|
    CS220322B2|1983-03-25|
    JPS5457447A|1979-05-09|
    SE7810027L|1979-03-27|
    AU4008478A|1980-03-27|
    IT1106093B|1985-11-11|
    BG42353A3|1987-11-14|
    LU80280A1|1979-06-01|
    MX156486A|1988-08-29|
    CA1079181A|1980-06-10|
    GB2004490A|1979-04-04|
    SE8303748D0|1983-06-30|
    FR2403860A1|1979-04-20|
    YU41839B|1988-02-29|
    EG13617A|1983-09-30|
    DE2841704C3|1981-12-03|
    SE8303748L|1983-06-30|
    YU225878A|1984-04-30|
    GB2004490B|1982-11-17|
    NO783240L|1979-03-27|
    PL209800A1|1979-05-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    YU159370A|1969-06-25|1977-06-30|Union Carbide Corp|Device for preheating and melting the surface layer of metal blocks|
    JPS535082Y2|1973-09-19|1978-02-08|DE3235647A1|1981-09-28|1983-04-14|Sumitomo Metal Industries, Ltd., Osaka|METHOD FOR THE CASTING AND MACHINING OF A RING-SHAPED BODY AND DEVICE FOR ITS IMPLEMENTATION|
    JPS6387790U|1986-11-27|1988-06-08|
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    DE202009018474U1|2009-11-10|2011-12-05|Elena Nikitina|Device for the arc treatment of the surface of metal products|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/836,512|US4115154A|1977-09-26|1977-09-26|Method and apparatus for producing a post-mixed, stabilized scarfing pre-heating flame|
    US05/921,810|US4161413A|1977-09-26|1978-07-03|Method and apparatus for producing a post-mixed, stabilized scarfing pre-heating flame|
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