US3921542A - Oxygen supplied thermal lance - Google Patents

Oxygen supplied thermal lance Download PDF

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Publication number
US3921542A
US3921542A US541276A US54127675A US3921542A US 3921542 A US3921542 A US 3921542A US 541276 A US541276 A US 541276A US 54127675 A US54127675 A US 54127675A US 3921542 A US3921542 A US 3921542A
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US
United States
Prior art keywords
jacket tube
core wires
lance
lance according
cross
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US541276A
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English (en)
Inventor
Ernst Brandenberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KUBATEC KUNSTSTOFF
KUBATEC KUNSTSTOFF- und BAUTECHNIK AG
Original Assignee
KUBATEC KUNSTSTOFF
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Publication of US3921542A publication Critical patent/US3921542A/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/14—Drilling by use of heat, e.g. flame drilling
    • E21B7/146—Thermal lances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0211—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in cutting
    • B23K35/0216—Rods, electrodes, wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/22—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising
    • B28D1/221—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising by thermic methods

Definitions

  • the relative dimensions of the elements of the lance are selected as follows:
  • the outer diameter of the jacket tube is between 3 mm and 10 mm; 8 to 16 core wires are used; the ratio of the diameter of the space to form a duct for oxygen to the overall diameter of material is between 1 4 to 1 10; the ratio of core wire diameter to the wall thickness of the jacket tube is between 1 0.7 to 1 2; and, to hold the wires in place, the jacket tube is formed with a bulge or undulation adjacent the end formed with a connection for the supply of oxygen, the bulge or deformation being so formed that, essentially, there is no reduction in cross section.
  • the present invention relates to a thermal lance to be supplied with oxygen, and more particularly to a thermal lance in which a plurality of consumable core wires are located within a jacket tube, oxygen being supplied to the interior of the jacket tube to generate extreme heat at the end of the lance upon ignition of the oxygen, and especially to such lances which have a smaller di ameter than those heretofore made.
  • Thermal lances for example of the type described in my prior patent U.S. Pat. No. 3,738,288 use an outer jacket tube which has a clear or inner diameter of about one-fourth inch to three-eig hths inch, and is formed at the end with a standard thread adapted for connection to standard plumming lines. The outer diameter of such tubes then corresponds to l3.5 mm and 17.2 mm, respectively.
  • Such thermal lances are capable of burning holes of from 4-8 cm diameter, approximately, or to make longitudinal cuts of a width of from 4-8 cm in such substances as concrete, rock aggregate, rocks and stones, and the like, and other hard material, when oxygen is supplied to the interior of the jacket tube.
  • a smaller lance can be constructed when observing a number of limiting conditions.
  • Such lances have, as heretofore, a plurality of core wires in a jacket tube.
  • the core wires are held in the jacket tube by a deformation or bulge, which may be an undulation which, in accordance with the invention, is so formed that essentially there is no reduction is cross-sectional area in the region of the bulge, or deformation.
  • the limiting dimensions for small-size lances, in accordance with the present invention have an outer diameter of between 3 and mm, in which 8 to 16 core wires are inserted.
  • the ratio of cross-sectional area of free space, left for conduction of oxygen, to the cross-sectional area of total material is between I 5 to l l0, and the ratio of core wire diameter to the wall thickness of the jacket tube is between 1 0.7 to l 2.
  • Lances of this type permit substantially extending the utility thereof, and to use such lances in locations and under conditions in which, previously, other and more complicated and difficult methods and processes of working materials were required.
  • the lance in accordance with the present invention can, for example, cut through heavily reinforced concrete walls. Holes made through such walls with customary drills are difficult to maintain in a straight line, since the drills are deflected by the reinforcing elements. Holes made in accordance with the present lances can be cut in surprisingly short time, for example for subsequent installation of water or gas pipes, electrical conduit, or the like.
  • FIG. 1 is a schematic fragmentary side view of a thermal lance
  • FIG. 2 is a schematic cross-sectional view through the lance along line lI-II of FIG. 1.
  • Lance l is used to cut holes, grooves, or slits in concrete, rock, building walls, metal plates, or the like, by combustion of the material. Such openings are generated by introducing oxygen into a jacket tube filled with metal wires, which are ignited at the far end. At the ignition end of the lance, extreme heat will be generated which is so high that concrete, rock, steel plates, and the like, will melt; combustible material will burn. The lance, itself, is also consumed and must be renewed from time to time.
  • the lance l is usually about 2 meters long. It has a jacket tube 2, about 2 meters long, made of steel. Usually, the jacket tube 2 has circular cross section. Core wires 3, which preferably are all alike, and likewise of steel which may have a higher carbon content than that of the jacket steel, are introduced into the jacket tube. The number of the core wires 3 is so selected that they ,fill the clear space of the round jacket tube 2 without, however, causing difficulties in introducing the core wires, and leaving some free space.
  • One end ofjacket tube 2 is formed with a stud thread 4, so that the jacket tube can be connected to a supply hose which, in turn, can be connected to an oxygen supply, such as a pressurized oxygen bottle, by means of a pressure hose.
  • the thread is merely exemplary of any suitable connection arrangement; rather than using a thread, a quick-release snap-on. plug and-socket connection may likewise be used.
  • Oxygen is supplied under a pressure which, preferably, is in the order of from 820bar, most desirably about 10 bar. The pressure to be used depends on the requirement of the specific use. High pressure results in small diameter of the hole being cut, with short operating periods; low pressure results in greater diameter of the resulting hole, or cut, but requires longer operating time.
  • the ratio of overall cross-sectional area of the ducts 5, through which oxygen passes, to the overall cross-sectional area of material should be preferably about 1 6, although a range of l 4 to l 10 will provide good results.
  • the wires should preferably be so arranged that the ducts 5 are distributed over the entire cross-sectional area of the jacket tube and as uniformly as possible, so that combustion at the ignition end of the lance is uniform. Such lances operate practically smoke-less, and with only little sparking, so that they can also be used in enclosed spaces.
  • the various core wires 3 should be retained in position in the lance. 'Vibration and shock arise during combustion.
  • the jacket tube 2, therefore, and the core wires 3 are locked together, for example by bulging the jacket tube into a bulged, or bowed shape 6. This bulge,
  • the cross section, and the shape of the cross section of this bulge or bow should preferably interfere little with oxygen ducts, and should leave the cross-sectional aspect of the lance as undisturbed as possible, and without necking or regions of reduced diameter.
  • the ducts 5, in the region'of the bow or bulge, should not have reduced diameter so that oxygen can pass without constriction, and so that lamina flow of gases is retained throughout the length of the lance.
  • the deflection height h preferably corresponds approximately to half the outer diameter of the jacket tube.
  • the bulge 5, as shown in FIG. 1, may be followed by a further, directly joined bulge 5 in the same, or in opposite direction (with respect to the major axis of the lance) so that a flat undulation results.
  • Each one of the bulges then need not deflect as much as the height h from the major axis of the lance, and the total deflection of two opposed bulges may, each, be about onehalf h.
  • the small, shallow bulge 6 prevents gluing of core wires 3, even if they are subjected to vibration, disturbances, or shock during combustion.
  • the core wires 3 will have the same bulged shape as the surrounding jacket tube 2, and will be securely retained therein.
  • the material of the jacket tube 2 is a steel which,.
  • the steel ofjacket tube 2 preferably has a higher silicon content than the material of the core wires 3.
  • the steel ofjacket tube 2 preferably has a lower carbon content than that of the core wires.
  • the interior, that is the core of the lance will have a particularly high temperature arise thereat which facilitates melting of the material to be removed on the one hand and, on the other, effectively prevents formation of a weld, or adhesion of the jacket tube on the edge of the wall, or slit of the material being cut.
  • the tendency of the jacket tube to weld to the material is effectively inhibited.
  • the relative low carbon content of the jacket tube additionally assists in ignition of the lance at the initiation of cutting.
  • the lances are made by first introducing as many core wires 3 into a jacket tube 2 with circular cross section as desired; the number of core wires is so selected that the cross-sectional space is well filled. Ten to eleven core wires are suitable. Thereafter, the jacket tube 2 with the core wires inserted therein, is deformed in a press to obtain the bulge 6. The deformation should be carefully carried out, so that the inner cross-sectional aspect of the jacket tube 2 is changed as little as possible so that passage of oxygen is not impeded.
  • Cross-Sectional Area Cross-sectional Area all wires 8.58 mm total cross-sect, area. core 3 and tube 2 24.3 mm cross-sect. area. oxygen ducts 5 4 mm oxygen pressure approximately l0 bar
  • Table 3 Composition of Materials Material Jacket Tube 2 Core Wires 3 carbon (C) 0.04 0.10 '7! 0.08 0.12 silicon (Si) 0.03 0.l5 71 none manganese 0.20 0.45 71 0.25 0.35 (Mn) phosphorus (P) 0.04 71 0.050 sulphur (S) 0.04 0.045
  • Thermal, consumable lance comprising a jacket tube (2) and a plurality of core wires inserted in the jacket tube, the core wires having an overall cross-sectional area which is less than the cross-sectional area within the jacket tube to leave space for passage of oxygen between the core wires and the jacket tube, the lance and core wires being relatively formed to retain the core wires within the jacket tube,
  • the improvement comprises the jacket tube has an outer diameter of about 3 to 10 eight to sixteen core wires (3) are located within the jacket tube (2);
  • the cross-sectional area of the space forming oxygen ducts (5) has a ratio to the total cross-sectional area of jacket tube (2) material and core wire (3) material of between about 1 4 to l l0; and the ratio of diameter of core wire (3) to the wall thickness of the jacket tube (2) is between about 1 0.7 to l 2.
  • the lance is essentially straight and is formed with a bulge-like deformation adjacent one of the ends, said one end being adapted for connection to a supply of oxygen, the extent of deformation having a height (h) of approximately half the outer diameter of the jacket tube (2).
  • the jacket tube (2) has a wall thickness in the order of l to L3 mm; the core wires, each, have a diameter in the order of about 1 mm;
  • the jacket tube (2) and the core wires (3) each comprise steels of different metallurgical composition, and wherein the carbon content of the steel of the jacket tube (2) is less than the carbon content of the material of the core wires (3).

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Gas Burners (AREA)
  • Furnace Charging Or Discharging (AREA)
US541276A 1974-01-23 1975-01-15 Oxygen supplied thermal lance Expired - Lifetime US3921542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH89774A CH586874A5 (fr) 1974-01-23 1974-01-23

Publications (1)

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US3921542A true US3921542A (en) 1975-11-25

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Country Status (11)

Country Link
US (1) US3921542A (fr)
JP (1) JPS50123552A (fr)
AT (1) AT339693B (fr)
BE (1) BE824660A (fr)
CA (1) CA1029650A (fr)
CH (1) CH586874A5 (fr)
DE (1) DE2501473C2 (fr)
FR (1) FR2258591B1 (fr)
GB (1) GB1460411A (fr)
SE (1) SE412433B (fr)
ZA (1) ZA75228B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401040A (en) * 1981-10-21 1983-08-30 Volcano Corporation Thermal torch
US5000426A (en) * 1989-08-15 1991-03-19 Edna Corporation Exothermic cutting torch
US5622672A (en) * 1995-03-24 1997-04-22 Alloy Surfaces Co. Ignition of thermal lance and means and method for use therewith and therefor
US20080265472A1 (en) * 2007-04-27 2008-10-30 P.C. Campana, Inc. Exothermic cutting torch
WO2018152651A1 (fr) * 2017-02-21 2018-08-30 Trefimet S.A. Lance thermique comprenant au moins un profilé tubulaire creux en aluminium et/ou magnésium, entre autres matériaux, permettant une utilisation dans des processus nécessitant une grande quantité d'énergie pour couper, perforer et/ou faire fondre des matériaux à haute demande thermique
EP3515655A4 (fr) * 2016-09-19 2020-10-14 Special Projects Operations, Inc. Système et configuration de distribution d'oxygène et de flambage à entrée silencieuse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2531918C3 (de) * 1975-07-17 1979-03-01 Rudolf 5882 Meinerzhagen Kallenbach Verfahren und Vorrichtung zum thermochemischen Bohren und Trennen von Gestein oder dergleichen, Schmelzmittel und Einrichtung zum Mischen der Schmelzmittelanteite
US4654496A (en) * 1984-04-11 1987-03-31 Peter L. DeMarsh Underwater oxy-arc cutting system using a non-thermic cutting rod

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3460223A (en) * 1967-08-02 1969-08-12 Zsolt Gyorgy Berczes Device for fixing holes by method of smelting,especially into building walls made of concrete,granite,sandstone or limestone,and method of producing the device
US3500774A (en) * 1968-11-04 1970-03-17 Robert Meier Means for cutting hard construction materials
US3570419A (en) * 1968-01-03 1971-03-16 Ernst Brandenberger Thermic lance
US3738288A (en) * 1971-02-05 1973-06-12 Kubatec Kunststoff U Bautechni Thermic lance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3460223A (en) * 1967-08-02 1969-08-12 Zsolt Gyorgy Berczes Device for fixing holes by method of smelting,especially into building walls made of concrete,granite,sandstone or limestone,and method of producing the device
US3570419A (en) * 1968-01-03 1971-03-16 Ernst Brandenberger Thermic lance
US3500774A (en) * 1968-11-04 1970-03-17 Robert Meier Means for cutting hard construction materials
US3738288A (en) * 1971-02-05 1973-06-12 Kubatec Kunststoff U Bautechni Thermic lance

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401040A (en) * 1981-10-21 1983-08-30 Volcano Corporation Thermal torch
US5000426A (en) * 1989-08-15 1991-03-19 Edna Corporation Exothermic cutting torch
US5622672A (en) * 1995-03-24 1997-04-22 Alloy Surfaces Co. Ignition of thermal lance and means and method for use therewith and therefor
US20080265472A1 (en) * 2007-04-27 2008-10-30 P.C. Campana, Inc. Exothermic cutting torch
US7749427B2 (en) 2007-04-27 2010-07-06 P.C. Campana, Inc. Exothermic cutting torch
EP3515655A4 (fr) * 2016-09-19 2020-10-14 Special Projects Operations, Inc. Système et configuration de distribution d'oxygène et de flambage à entrée silencieuse
WO2018152651A1 (fr) * 2017-02-21 2018-08-30 Trefimet S.A. Lance thermique comprenant au moins un profilé tubulaire creux en aluminium et/ou magnésium, entre autres matériaux, permettant une utilisation dans des processus nécessitant une grande quantité d'énergie pour couper, perforer et/ou faire fondre des matériaux à haute demande thermique
CN110352109A (zh) * 2017-02-21 2019-10-18 特雷菲梅特股份有限公司 包括由铝和/或镁以及其它材料制成的至少一个中空管状型材的热喷枪，该热喷枪能够被用于需要大量的能量来对具有高热需求的材料进行切割、穿孔和/或熔化的工艺中
EP3587019A4 (fr) * 2017-02-21 2020-12-23 Trefimet S.A. Lance thermique comprenant au moins un profilé tubulaire creux en aluminium et/ou magnésium, entre autres matériaux, permettant une utilisation dans des processus nécessitant une grande quantité d'énergie pour couper, perforer et/ou faire fondre des matériaux à haute demande thermique

Also Published As

Publication number Publication date
ATA20775A (de) 1977-02-15
DE2501473C2 (de) 1984-03-01
SE7500611L (fr) 1975-07-24
GB1460411A (en) 1977-01-06
JPS50123552A (fr) 1975-09-29
CH586874A5 (fr) 1977-04-15
FR2258591B1 (fr) 1981-02-06
ZA75228B (en) 1976-01-28
DE2501473A1 (de) 1975-07-24
FR2258591A1 (fr) 1975-08-18
CA1029650A (fr) 1978-04-18
BE824660A (fr) 1975-05-15
AT339693B (de) 1977-11-10
SE412433B (sv) 1980-03-03

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