JPH0573806B2 - - Google Patents

Abstract

1. Apparatus for cooling beams, comprising horizontal roller guides (2) on which lean the flanges of the beam (1), vertical roller guides, as well as cooling boxes (3, 4, 5) provided with orifices dispensing a cooling liquid, the boxes (5) which are used for cooling the outer surfaces of the flanges having a total height being at least equal to the height of the flanges and the boxes (3, 4) which are used for cooling the inner surfaces of the flanges having side walls which extend nearly over the whole inner surface of the flanges, characterized - in that the said boxes (3, 4, 5) are provided with equally spaced orifices dispensing water through the walls facing the beam (1) ; - in that the boxes (3, 4) used for cooling the inner sufaces of the flanges as well as the web account together for at least 70 % of the web surface ; - in that the boxes (4) for cooling the inner surfaces of the flanges as well as the upper surface of the web are mounted below arms (10) which can pivot in the direction of the transport of the beams (1) and - in that a damming element, comprising at least one metallic box (32), which is connected to a pressure fluid source and which is provided with openings (33) opposite to the surfaces of the beam, is located at the outlet of the cooling device, this damming element having a cross section which is such that it can be fitted into the upper chamber of the beam (1).

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a method and apparatus for cooling rolled metal materials, in particular sections, on-line in a rolling mill.

BACKGROUND OF THE INVENTION It is known to impart specific mechanical properties to rolled materials by carrying out special heat treatments during and/or after rolling. Such a heat treatment method is disclosed, for example, in Belgian Patent No. 824100. In this patent, after the final pass of rolling, the moving rolled material is surface hardened and then self-tempered. This quenching/self-tempering method has been adopted for rolling reinforcing bars for concrete, but attempts to apply this method to other rolled materials such as sections are still in the experimental stage, and it is difficult to meet the specifications of these rolled materials. requires the development of a special method that takes into account the geometry of the rolled material to be treated and the processing conditions.

One such method is described in Belgian patent application no. 6/47803, filed March 31, 1983.
In the method described in this Belgian patent, the distance between the rolled material and the cooling device is controlled in time in such a way that this distance is equal to a predetermined value, or at least as close as possible. A variant embodiment of the method of this Belgian patent provides continuous control of the distance. In this method, a laminar water jet is injected from a predetermined number of cooling boxes arranged around the rolling material onto the outer peripheral surface of the moving rolled material at the exit side of the final rolling stand of the rolled material, such as a section steel. This forms a film of agitated water. In order to accurately and effectively implement this cooling method, it is necessary to
The shape of the cooling box must be matched to the shape of the section steel surface so that a water film with a thickness of . Therefore, extremely complex equipment is required to carry out the method of this Belgian patent. Furthermore, in the case of the apparatus disclosed in the Belgian patent, it is difficult to carry out different treatments in rolling equipment for rolled materials having widely different cross-sectional shapes.

Problems to be Solved by the Invention It is an object of the present invention to provide a simple and effective method that does not have the above-mentioned drawbacks of the conventional method and can perform the same hardening treatment on rolled materials of the same type.

Means for Solving the Problems The present invention provides a method for rolling a section steel that is fed longitudinally with an open groove formed by two vertical sections and a horizontal section connecting these vertical sections facing upward. In the on-line cooling method, a laminar water jet is injected into the vertical section of the section, and a laminar water jet is injected into the horizontal section, at the same time forming a layer of water on the horizontal section. It has characteristics.

Although the cross-sectional shape of a section steel often changes during rolling, by using the cooling box of the method of the present invention, a water film of constant thickness can be maintained at all times.

The invention further provides a plurality of horizontal guide rolls supporting the ends of the two vertical sections of the section and a plurality of vertical guide rolls supporting the outside of each vertical section of the section, coupled to a water supply source. rolling a section steel that is fed vertically with the open groove formed by two vertical parts and a horizontal part connecting these vertical parts facing upward, and having a cooling box with a square cross section. In on-line cooling equipment, each cooling box has equally spaced orifices on the surface facing the section, and the height of the cooling box cooling the outer surface of the vertical section of the section is at least horizontal. The cooling box, which is equal to the height of the vertical section and cools the horizontal section and the inner surface of the vertical section, is characterized in that it covers substantially the entire surface of the vertical section and partially covers the horizontal section. .

The upper cooling box is preferably suspended in such a way that even if the section of the section steel should be deformed, it can pass through the cooling box without being damaged.

The present invention will now be described with reference to the accompanying drawings.

EXAMPLES The present invention will now be described by way of examples with reference to the accompanying drawings.

As shown in Figures 1 and 2, the section steel 1 has a cooling box 3,
4 and 5, it is fed over the roll group 2 in the direction of arrow F. Approximately cylindrical orifices are formed at equal intervals on the surfaces of the cooling boxes 3, 4, and 5 facing the shaped steel 1. These orifices are slightly inclined with respect to the rolling axis so that the entire circumference of the rolled section is regularly cooled. The outer cooling box 5 is attached to an outlet guide 6 which is movable in a direction perpendicular to the direction of movement of the section steel. The height of this outer cooling box 5 is 1
must be beyond the upper edge of the The water overflows into the upper groove of the section steel 1 inside the vertical section, which is cooled by the upper cooling housing 4. The distance between the two upper cooling boxes 4 can be adjusted with nuts 7. In addition, in order to be able to change the interval between the upper cooling boxes 4 when the cross section of the section steel 1 changes,
A predetermined elastic force is applied to the cooling box 4 by a spring 8.

The height of the upper cooling box 4 can be adjusted by the arm 10 suspending it. That is, the adjustment screw 11 driven by the motor 12 comes into contact with the stopper 14 that is integral with the arm 10, so that the position of the arm 10 can be adjusted accurately. The suspension arm 10 is rotatable in the direction of movement of the section 1, and this configuration provides flexibility in the longitudinal direction and eliminates defects in the horizontal (web) and vertical sections (flange) of the section, e.g. Damage to the upper cooling case 4 due to "meandering" or "bulging" of the steel is prevented. Incidentally, by operating the piston 9, the upper cooling case 4 can also be moved to a completely retracted position.

The lower cooling case 3 is pre-assembled off-line. The distance between the two lower cooling boxes 3 is determined by a spacer 13 selected according to the height of the section steel to be rolled.
filled in by. Since the lower cooling box 3 has the shape and function as a guide, it has the robustness and strength to withstand shocks caused by collisions with the rolled material. The lower cooling box 3 is installed when the cross-sectional shape of the rolled material changes and the rolls are changed.

Positioning of the section steel on the roller table is performed by three positioning rolls placed at the entrance, center, and exit of the cooling line. The length of one cooling line is 8 m to prevent the rolled material from moving laterally between these three positioning rolls.
It is preferable to limit it to the following. Longer cooling lines are required to achieve the desired cooling effect for rolled materials with large cross-sections, in which case multiple configurations shown in Figures 1 and 2 may be provided to form one cooling line. You may. In the case of a rolled material with a small cross section, the moving speed may be increased. For a cooling device with a cooling zone length of 6 m, the length of the horizontal part is 200 ~
H within the standard dimension range of US section steel, which is 1000 mm.
The moving speed of the section steel can be 0.5 to 4 m/sec.

The upper cooling box 4 is placed 10 to 20 mm apart from the vertical and horizontal parts of the section steel 1. During operation of the apparatus of the present invention, the upper groove defined by the two vertical sections and the horizontal section of the section steel 1 is filled with cooling water up to approximately half the height of the vertical section of the section steel 1. In order to prevent water from accumulating in this upper groove, the space between the two upper cooling cases 4 may be filled with a spacer similar to the spacer 13 above over the entire length of the upper cooling cases 4. However, the results of experiments conducted by the present inventor show that even if no spacer is used between the upper cold boxes 4, the uniformity of cooling is not affected by the water stored in the upper grooves of the section steel 1. I understand.

In addition, as long as the entire thickness of the spacer 13 inserted into the interval between the lower cooling box 3 is 30% or less of the length of the horizontal portion of the section steel 1, the lower cooling box 3 and the upper cooling box It has also been confirmed that the absence of a laminar water jet on the upper and lower surfaces of the horizontal section of the section 1 between the steel section 1 and the body 4 does not affect the mechanical properties obtained by the heat treatment.

In order to be able to use the same two lower cooling boxes 3 over a wide area of the section steel 1 with different horizontal portion lengths, the mutually opposing sides of the lower cooling boxes 3 should be As shown in the figure, if the shape steel is made uneven (nested type) and the length of the horizontal part is short, 2
The concave and convex portions of the two lower cooling boxes 3 are fitted into each other, and in the case of a section steel 1 having a long horizontal portion, the two lower cooling boxes 3 are separated from each other. In the latter case, section steel 1
The spray density in the middle of the horizontal part is reduced but still sufficient.

When the shaped steel 1 leaves the above-mentioned cooling device and enters the self-tempering process, a dam is installed to prevent the water contained in the upper groove of the shaped steel 1 from coming out together with the shaped steel 1. elements are provided. In other words, if water is allowed to accumulate in the upper groove of the section steel 1, the upper half of the section steel 1 will be kept cool even past the point where the self-tempering process should begin, allowing accurate heat treatment. become unable to do so.

As shown in FIG. 3, the dam element consists of a metal sealed box 34 and a flat box 32 attached to this sealed box 34 and having a number of holes 33.
3, high-pressure air is injected onto the section steel 1 at an angle in the direction opposite to the movement of the section steel 1. In addition, in FIG. 3, a suspension device for the compact flat box 34 and an air conduit to the box 32 are not shown. The dam element serves as a gas seal and prevents cooling water from entraining into the section 1. It is clear that this dam element must be replaced every time the type of section 1 changes. Note that other inexpensive fluids can be used instead of air. Furthermore, instead of the box 32 with holes, it is also possible to use a large number of injection nozzles that spray jets of various shapes.

[Brief explanation of the drawing]

FIG. 1 is a side view of the cooling device of the present invention. FIG. 2 is a sectional view taken along line - of the device of FIG. 1; FIG. 3 is a perspective view of the dam element of the present invention. Figure 4 shows part 1 of the present invention.
The top view of the cooling case of a modification. (Main reference numbers), 1...Shaped steel, 2...Guide roll, 3...Lower cooling box, 4...Upper cooling box, 5...Outer cooling box, 6...Rolling mill Exit guide, 13...Spacer, 32-34...Dam element.

Claims (1)

[Claims] 1. Cooling a section steel on-line in a rolling facility that is fed in the vertical direction with the upper groove defined by two vertical sections and a horizontal section connecting these vertical sections open upwards. A method characterized in that a laminar water jet is injected into the vertical part of the section 1, and a laminar water jet is injected into the horizontal part, and a layer of water is maintained. 2. The method according to claim 1, wherein at least 70% of the horizontal portion of the section 1 is injected with a laminar water jet. 3. The method according to claim 1 or 2, wherein the depth of the water layer formed above the horizontal portion is maintained at 10 to 20 mm. 4. A patent claim for injecting a gas jet obliquely to the inner surface of the section steel 1 in a direction opposite to the traveling direction of the section steel 1 in order to prevent water from being entrained on the upper surface of the horizontal portion of the section steel 1. The method according to any one of the ranges 1 to 3. 5 A plurality of horizontal guide rolls 2 that guide the ends of the two vertical sections of the section steel 1, a plurality of vertical guide rolls that guide the outer part of each vertical section of the section steel 1, and a connection to a water supply source. The cooling boxes 3, 4, and 5 are square in cross section, and the upper groove, which is defined by two vertical parts and a horizontal part connecting these vertical parts, is opened upward and extends vertically. In a device that cools the section steel 1 to be sent online in a rolling facility, each cooling box 3, 4, 5 has orifices formed at equal intervals on the surface facing the section steel 1. The height of the cooling box 5 that cools the outer surface of the vertical section is at least equal to the height of the horizontal section of the section steel 1, and the cooling box 3 that cools the inner surface of the vertical section and the horizontal section of the section steel 1; 4 covers substantially the entire vertical part and partially covers the horizontal part. 6. Claim 5, wherein the horizontal side surfaces of the cooling boxes 3 and 4 that cool the inner surface of the vertical portion and the horizontal portion of the section steel 1 cover at least 70% of the surface of the horizontal portion of the section steel 1. The device described in. 7 Consists of a pair of cooling boxes 3 and 4 that cool the inner surface of the vertical part and the horizontal part of the section steel 1, which are arranged nested inside each other, and the horizontal sides of these cooling boxes are 7. The device according to claim 5, wherein the orifices are formed at equal intervals. 8. Outer cooling boxes 5 that cool the outer surface of the vertical portion of the section steel 1 are attached to the exit guide 6 of the rolling mill, and the height of these outer cooling boxes 5 is equal to that of the section steel 1.
8. A device according to any one of claims 5 to 7, which is higher than the upper edge of the device. 9. Claims 5 to 9, wherein the upper cooling box 4 that cools the inner surface of the vertical portion and the upper surface of the horizontal portion of the section steel 1 is attached to an arm 10 that is rotatable in the direction of movement of the section steel 1. 8. The device according to any one of 8. 10. The device according to claim 9, wherein the arm 10 is rotated by a jack 9. 11. The device according to any one of claims 5 to 10, wherein the inclination of the arm 10 is adjusted by a stop 14 integral with the arm 10 and a screw 11 abutting it. 12. Claims 5 to 5, wherein the distance between the pair of upper cooling boxes 4 that cool the inner surface of the horizontal portion of the section steel 1 is adjusted by a nut 8 and a spring 8.
12. The device according to any one of 11. 13. The device according to any one of claims 5 to 12, wherein a spacer 13 is inserted between lower cooling boxes 3 that cool the inner surface of the vertical portion of the section steel 1. 14 A dam element consisting of at least one metal box 32 connected to a source of pressurized gas and having holes inclined towards the surface of the section steel 1 in the direction opposite to the direction of movement of the section steel 1 is placed on the exit side of the cooling zone. 14. The device according to any one of the ranges 5 to 13, wherein the dam element is arranged and has a cross-sectional area that can be accommodated in the upper groove between the two vertical sections of the section 1.