US3870571A - Method for surface treatment of intermediate products which are being flame scarfed - Google Patents

Method for surface treatment of intermediate products which are being flame scarfed Download PDF

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Publication number
US3870571A
US3870571A US411225A US41122573A US3870571A US 3870571 A US3870571 A US 3870571A US 411225 A US411225 A US 411225A US 41122573 A US41122573 A US 41122573A US 3870571 A US3870571 A US 3870571A
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United States
Prior art keywords
product
flame
wetting
scarfed
air jet
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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
US411225A
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English (en)
Inventor
Karl Monreal
Rudolf Schwitzgobel
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
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    • 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
    • B23K7/00—Cutting, scarfing, or desurfacing by applying flames
    • B23K7/06—Machines, apparatus or equipment specially designed for scarfing or desurfacing

Definitions

  • ABSTRACT Steel products are flame scarfed at low temperatures followed by wetting and immediate force drying by air jets blowing wetness and scale off the surface of the product.
  • Product or jet producing nozzles move during this descaling whereby particularly the air jet has a component towards the, relatively speaking, oncoming product.
  • Descaling can be carried out in the same run as flaming or immediately thereafter following, for example, reversal of movement of the product.
  • Rolled or continuous casts products are, for example,
  • Flaming machines as they are used today have a flame producing-burner nozzle, and pressurized water removes the scale as produced ahead of the burner by washing the scale away, transversely to the direction of flaming, whereby the scale is granulated.
  • a new layer of scale is produced just behind the burner nozzle, and this layer usually has thickness of about 0.5 mm.
  • the heat content of the product after flaming causes some of this water to evaporate and already loosened scale may adhere again upon too rapidly occurring, local evaporation. Evaporated residual water leads to rust and leaves calcium and other deposits on the flamed surfaces which again impedes quality inspection of the product.
  • the water and air nozzles must be inclined towards the product with respect to relative movement of the treated product.
  • the product and these nozzles move relative to each other, and nozzles spray and blow in direction opposite the direction of movement of the product relative to the nozzles.
  • the air flow must be dimensioned that indeed no water remains on the surface of the product.
  • Air and water jets run preferably parallel to each other and/or the air is directed towards the product as well as transverse to the direction of movement thereof. In either case, the flamed surface is being completely satisfactorily dried and cleaned in that manner.
  • water spraying one could dip the product shortly into a water filled tank followed by air blowing for removing scale and water. In either case, it was found that the surface of the product is scale free and clear and can be inspected without difficulties.
  • equipment which is known in parts is used, such as a gas-oxygen burner with a spray nozzle disposed close to the burner and applying water to a surface portion of the product to be flame scarfed just before that portion is subjected to the flame of the burner.
  • Additional spray water or water spraying nozzles as well as the air nozzles are disposed at a distance from the burner to affect that surface portion somewhat later.
  • These latter nozzles should be directed towards the product surface with a component of jet flow in direction of movement of the product, assuming that the product moves during the treatment.
  • spray water and air blowing nozzles could be mounted on a movable unit, and moves past the, relatively speaking, stationary product. Still alternatively, the nozzles may direct the spray water and drying air from a direction laterally against the surface of the product.
  • the method and equipment in accordance with the present invention permits descaling of the intermediate product, following the flame treatment, either directly immediately or somewhat delayed but still immediately thereafter, depending on the physical separation as well as on the operational sequence of flaming on one hand and wetting and air blowing on the other hand.
  • FIG. 1 is a schematic sideview of a flaming apparatus with scale removal equipment operating in the same run
  • FIGS. 2 and 3 are schematic sideviews of a flaming apparatus with scale removal equipment following a reversal of movement of the workpiece.
  • FIG. 1 shows the product lvas being moved through the machine by means of a roller track 8.
  • FIGS. 2 and 3 show a carriage 2 for that purpose.
  • the arrow on product 1 indicates in each case the direction of movement of the product as it passes through the flaming machine, and other equipment.
  • the roller track 8 passes product I under a flue hood 5, under which here is provided, first in direction of advance of the product, a nozzle or set of nozzles 4 for apjust ahead of application of heat by a burner 3 of the gas-oxygen variety.
  • the product is flame scarfed this way, and the scale is granulated immediately.
  • the product 1 continues to be moved under hood for a certain distance, and just outside thereof, i.e. spaced-apart from the flaming equipment, there are provided spray water nozzles 6, and pressurized air nozzles 7 are located just behind nozzles 6. As shown somewhat schematically, the nozzles 6 and 7 are oriented so that they eject the respective jets parallel to each other and in an inclined direction with respect to the direction of advance, i.e. at less than 90 to the surface normal of the product to blow and spray with a component directed towards the oncoming product.
  • FIG. 1 practices the method of the invention as part of one continuous operation as far as flaming is concerned.
  • the product 1 is flame scarfed and descaled in one continuous run, because burner 3 as well as nozzles 4, 6 and 7, are simultaneously in operation.
  • FIGS. 2 and 3 refers to alternating operations of flame treatment and descaling of the surface of product 1 as per the inventive improvement.
  • FIG. 2 shows the equipment during-the flaming step. Only a burner 3' as well as water nozzle 4 operate presently to obtain flame scarflng as well as granulation of the resulting scale. The carriage 2 moves the intermediate product I, to the right in the drawing during a run for flame scarfing the product.
  • FIGS. 2 and 3 show that particularly the inventive descaling could be carried out through inversion of movement.
  • the product 1 could remain stationary while water spray nozzles 6 and air blowing nozzles 7 move over the surface of the product, whereby the direction of blowing has also a component towards the, relatively speaking, oncoming product.
  • This mode of operation for example, when nozzles 6 and 7 are disposed on a carriage that moves in laterally displaced relation along the product whether held on a carriage 2 as in FIGS. 2 and 3 or on a roller track as in FIG. 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Nozzles (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US411225A 1973-01-31 1973-10-31 Method for surface treatment of intermediate products which are being flame scarfed Expired - Lifetime US3870571A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2305285A DE2305285C2 (de) 1973-01-31 1973-01-31 Verfahren und Vorrichtung zur Oberflächenbehandlung maschinengeflämmten Vormaterials

Publications (1)

Publication Number Publication Date
US3870571A true US3870571A (en) 1975-03-11

Family

ID=5870815

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Application Number Title Priority Date Filing Date
US411225A Expired - Lifetime US3870571A (en) 1973-01-31 1973-10-31 Method for surface treatment of intermediate products which are being flame scarfed

Country Status (8)

Country Link
US (1) US3870571A (de)
JP (1) JPS5713368B2 (de)
AT (1) AT365500B (de)
CA (1) CA1001056A (de)
DE (1) DE2305285C2 (de)
FR (1) FR2216354B1 (de)
IT (1) IT993634B (de)
ZA (1) ZA738003B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4115153A (en) * 1976-07-19 1978-09-19 Centro-Maskin Goteborg Ab Method at gas planing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2478494A1 (fr) * 1980-03-20 1981-09-25 Delattre Levivier Machine de decriquage de brames au chalumeau
JP4907505B2 (ja) * 2007-11-28 2012-03-28 新日本製鐵株式会社 ホットスカーファー設備へのノロ付着防止方法及びホットスカーファー設備

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2218141A (en) * 1939-08-23 1940-10-15 Nat Tube Co Apparatus for removing fumes and solids in metal skinning equipment
US3354002A (en) * 1966-03-10 1967-11-21 Union Carbide Corp Thermochemical scarfing method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2218141A (en) * 1939-08-23 1940-10-15 Nat Tube Co Apparatus for removing fumes and solids in metal skinning equipment
US3354002A (en) * 1966-03-10 1967-11-21 Union Carbide Corp Thermochemical scarfing method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4115153A (en) * 1976-07-19 1978-09-19 Centro-Maskin Goteborg Ab Method at gas planing

Also Published As

Publication number Publication date
DE2305285C2 (de) 1974-03-07
FR2216354B1 (de) 1976-06-18
ATA673173A (de) 1981-06-15
IT993634B (it) 1975-09-30
AT365500B (de) 1982-01-25
CA1001056A (en) 1976-12-07
ZA738003B (en) 1974-09-25
DE2305285B1 (de) 1973-08-09
FR2216354A1 (de) 1974-08-30
JPS49106459A (de) 1974-10-09
JPS5713368B2 (de) 1982-03-17

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