Abstract:
The invention relates to a method for heat-treating plate- or web-like sheet metal, wherein the metal sheet (6) is heated and subsequently continuously transported by transport means through a quenching device in passage direction (D) and cooled by a fluid cooling medium, wherein at least a first cooling medium jet in the form of a flat jet is generated by a nozzle body (1) having at least one slit-shaped nozzle opening (4), which is connected to a connection (2) for introducing the fluid cooling medium, wherein the first cooling medium jet extends transversely to passage direction (D), and is directed, at a first angle (α), towards both the upper side (5) and the underside (7) of the metal sheet (6). According to the invention, at least a second cooling medium jet in the form of a flat jet is generated by means of a slit-shaped second nozzle opening (11, 17). The second cooling medium jet is directed over the width of the metal sheet, parallel to the first cooling medium jet, at a second angle (β), towards both the upper side (5) and the underside (7) of the metal sheet (6). In addition, the first cooling medium jet and the second cooling medium jet are directed in opposite directions in passage direction (D), and have a predetermined spacing (A) between each other in passage direction (D). Formed on the upper side and the underside, between the first and the second cooling medium jets, is a cooling area upon which cooling medium acts and in which the metal sheet is intensively cooled.
Abstract:
Zur Schroffabkühlung von erwärmten Bändern oder Platten aus Metall, ist es bekannt, ihre Oberfläche über sich über ihre Breite erstreckende Flachstrahldüsen direkt mit Wasser zu beaufschlagen. Dies kann wegen der inhomogenen Wassermenge zwischen und innerhalb der Auftrefflächen zu einer ungleichmässigen Abkühlung führen. Der ebenfalls bekannte Einsatz einer Vielzahl von Kühlmittelstrahlen geringen Durchmessers, wobei das Kühlmittel vollständig verdampft, erfordert einen hohen Filteraufwand des zurückgeführten Kühlmittel. Bei beiden Verfahren beim Abkühlen von Bändern besteht die Gefahr von Verzug. Es soll ein Verfahren und eine Vorrichtung entwickelt werden, die diese Probleme lösen. Erfindungsgemäss wird überwiegend die untere Oberfläche der Bänder oder Platten durch Wasserstrahlen beaufschlagt, wobei die Wasserstrahlen aus in mindestens einer Düsenreihe angeordneten Vollstrahldüsen mit einem Durchmesser von 0,5 bis 5 mm austreten. Abkühlung von Bändern oder Platten aus Metall.
Abstract:
본 발명은 연속 소둔라인의 급냉대에서 스트립의 온도를 균일하게 제어하는 방법 및 장치에 관한 것으로, 스트립의 온도 제어를 위해 냉각 노즐블록들을 스트립 앞 뒤면에 각각 상하로 다수 설치하되, 길이방향 유량제어 노즐블록과 폭 방향 유량제어 노즐블록으로 구획하여 다수 세트 설치하고, 상기 급냉대의 입출측에 스트립 센터 온도 측정기와 폭방향 온도 측정기를 설치하며, 상기 스트립 센터 온도 측정기와 폭방향 온도 측정기로부터 얻어진 온도 검출값을 이용하여 상기 길이방향 유량제어 노즐블록과 폭 방향 유량제어 노즐블록의 미스트 분사 유량을 각각 제어함으로써 스트립의 온도를 균일하게 제어하고, 스트립의 평탄도 변화를 최소화하도록 제어하는 연속 소둔라인 급냉대의 스트립 온도제어 방법 및 장치를 제공한다. 본 발명에 의하면, 연속소둔라인 급냉대 입력단과 출력단의 폭방향 온도계를 이용하여 온도를 검출하고, 피드백, 피드포워드 제어 기법을 이용하여 급냉대의 폭방향 미스트(mist) 분사 유량 제어를 통해 스트립의 폭방향 온도를 균일하게 제어할 수 있음으로써 스트립의 평탄도 변화를 최소화할 수 있는 우수한 효과가 얻어진다.
Abstract:
The present invention discloses a coolant header for hot rolled strip cooling devices, which cools a hot rolled strip fed from a finish rolling mill. The header includes a body provided with a plurality of discharging holes formed through the lower surface of the body such that the discharging holes are arranged along the width of the hot rolled strip and at least three rows of discharging holes are arranged along the length of the hot rolled strip; a coolant pipe provided in the coolant header, with an outlet hole formed on a side surface of the coolant pipe to discharge coolant; an inclined plate placed in front of the outlet hole of the coolant pipe such that the plate is inclined downwards, thus evenly distributing the coolant discharged from the outlet hole over the entire surface of the coolant header; a perforated plate placed above the discharging holes and causing the coolant to flow uniformly; and a flow stabilizing filter placed between the discharging holes and the perforated plate and causing the coolant to flow in a stabilized laminar manner. The present invention discharges a great amount of stabilized flow coolant onto the hot rolled strip, thus maximizing the strip cooling efficiency.
Abstract:
The present invention relates to a method of obtaining plain and ribbed wire rod with multi-phase structure, consisting in pre-heating billets made of different grades of steel, particularly with 0.07 - 0.40%C content, in a walking-beam furnace to a temperature of 1 170-1 195°C and then rolling them to final diameters within the range from 5.5 mm to 9 mm, where the process is characterised in that the wire rod passes through water boxes downstream Morgan mill at the speed not lower than V=30m/s. At least one water box, pinch-roll unit and head for laying coils on the controlled cooling conveyor system are installed downstream Morgan mill, and each water box is equipped with an inlet, at least one cooler, at least one stripper, dryer and outlet what allows to obtain temperature (TUZ) - during laying of wire rod coils on the controlled cooling conveyor system - at the level between T= 760°C (AC3) and T = 800°C (AC1 ); then the wire rod in the form of coils is transferred onto the controlled cooling conveyor system comprising at least 10 sections, each having separate speed adjustment between 0.08-2.50m/s, where at least one fan intended for fast cooling of wire rod to the temperature T2=350-500°C is installed below at least two sections; moreover, above at least six sections cased with side walls, there are covers which, when lowered, create a tunnel allowing for heating wire rod at T2 temperature within a specified time (t2) not less than 60 s; after the heating process, the wire rod is cooled under atmospheric conditions down to the ambient temperature on not less than two sections of the conveyor.