JPS59226123A - Immersion cooling pipe for wire rod and steel bar - Google Patents

Abstract

PURPOSE:To provide a titled cooling pipe which prevents the rise of the average cooling water temp. in a cylindrical body and improves cooling power by the constitution in which respectively draining ports for discharging cooling water are provided on the top and bottom side surfaces of the cylindrical body of the cooling pipe to improve the displacement rate of the cooling water in the cylindrical body. CONSTITUTION:A cooling pipe 1 ejects cooling water toward the inside of a horizontally disposed cylindrical body 2 from annular nozzles 9 provided at both ends of the body 2 concentrically with the axial center of the body 2, discharges simultaneously said water from guide parts 5, 6 at both ends of the body 2, draining pipes 7, 8 provided on the top and bottom side surfaces, etc. to fill the cooling water in the body 2 and cools a wire rod body 10 such as a wire rod, steel bar or the like, traveling in said cooling water along the axial central part of the body 2. Said ports 7, 8 are provided by >=1 piece to such cooling pipe and the relation between the total sectional areas A1 and A2 of the ports 8 and 7 is set at A2>A1. The effective displacement rate of the cooling water is thus maintained high and the cooling power is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to immersion cooling pipes for wire rods and steel bars.As is well known, wire rods such as wire rods and steel bars manufactured by hot rolling are installed after the finishing E rolling mill row. In the cooling zone, the steel is cold-pressed from the high temperature immediately after hot rolling to a predetermined temperature in order to control mechanical properties and suppress scale formation. In such cooling zones, water is usually used as the cooling medium. During this water cooling, the wire material should be cooled uniformly around the circumference, longitudinal direction, and cross-sectional direction.

It is also important to achieve high cooling capacity. Improving the cooling capacity has the advantage that the flow rate of cooling water required to obtain a predetermined temperature drop can be reduced, so that the pump power can be reduced.

In continuous hot rolling, in the cooling zone between stands, such as between intermediate rolling mill rows and finishing rolling mill rows.

After cooling water is supplied to the rolled material, controlled ratio rolling is performed again by the finishing mill row. This controlled rolling is
It is a hot rolling method that is carried out by controlling heating temperature, rolling temperature, rolling reduction rate, etc. The purpose is to make the crystal grains fine and uniform in the wire material and improve the mechanical properties. It is possible to produce a filament material having the same structure and mechanical properties as the conditioned material. In order to achieve this controlled rolling temperature pattern, the inter-stand cooling zone must have as high a cooling capacity (heat transfer coefficient as possible) and a wide control range.

In the cooling zone in the various rolling processes mentioned above.

Conventionally, various types of cooling pipes have been used.

For example, the rolled material running along the axis of the inner tube is cooled in the advancing direction of the rolled material through nozzles (slits) placed near both ends of the inner tube at regular intervals in the circumferential direction of the inner tube. There is a spray type that sprays water in the form of a spray.

This one-spray type has the disadvantage that the cooling capacity is high in the areas where the high-pressure water is directly in contact with the rolled material, but low in other areas, and it is less effective than the length of the cooling zone, the flow rate of the cooling water, and the pump power. Therefore, the cooling efficiency is low.

Therefore, in Utility Model Publication No. 57-14965, the applicant of the patent application provided an immersion type cooling pipe with excellent cooling performance.

According to this method, cooling water is jetted out in opposite directions from annular nozzles provided at both ends of the cooling pipe to form a water film that covers the opening of the cooling pipe, and cooling water is directed into the pipe from the longitudinal center of the cooling pipe. The pipe was supplied with cooling water to fill the inside of the pipe. According to this immersion type cooling pipe, the high-temperature wire material running along the axis of the cooling pipe is immersed in the cooling water filling the pipe, and the contact time with the cooling water becomes longer.
Moreover, the cooling is uniformly performed, and extremely high cooling performance can be obtained.

However, with this conventional immersion type cooling pipe, if the length of the cooling pipe is short, there is no problem because the cooling water supplied from the center is quickly drained from both ends. If the length is longer than the diameter, there is a risk that some of the cooling water will partially accumulate within the cooling pipe. When a part of the cooling water remains in the cooling pipe for a long time, the average water temperature in the cooling pipe increases due to the accumulation of cooling water, and the cooling capacity for the stationary part of the rolled material becomes lower than the cooling capacity for the tip part of the rolled material. . That is, a difference occurs in the temperature of the cooling water between the tip end portion and the steady portion of the rolled material, resulting in non-uniform cooling in the longitudinal direction.

Therefore, the invention of the tree supplies cooling water from both ends of the cooling pipe, drains it from the midway in the longitudinal direction of the cooling pipe, and makes the cross-sectional area of the drain port appropriate, thereby making the cooling water effective. The purpose of the present invention is to provide an immersion cooling pipe for wire rods and steel bars that can increase the replacement rate (the ratio of the amount of water discharged from the drain port to the amount of cooling water supplied), thereby increasing the cooling capacity.

Therefore, the feature is that the cooling water is spouted inward from the annular nozzles provided at both ends of the cylinder having a horizontal axis and concentrically with the axis. In a cooling pipe for immersion cooling a wire rod or steel bar that is filled with water and runs through the axial center of the cylinder, two or more drainage ports are provided along the longitudinal direction on the upper and lower surfaces of the cylinder. The other feature is that the relationship between the total cross-sectional areas A1 and A of the upper and lower drain ports is A, ) A.

Hereinafter, embodiments of the wooden invention will be described in detail based on the drawings.

The immersion type cooling pipe +11 according to the wooden invention shown in FIG.
A cylindrical body (2) with openings at both ends arranged horizontally;
)' +31 VC-connected cooling water supply pipe (
4) And.

It consists of an inlet guide part (5) and an outlet guide part (6) extending concentrically on both end faces of the cylinder (2). The inner surface of the entrance guide portion (5) is formed into a tapered surface.

A drain port (7) is provided on the lower surface of the axially central portion of the cylinder (2).
) has been established. Similarly, on the top surface, there are five drainage holes (8) in the shape K, extending from the center to the left and right along the longitudinal direction. If the total cross-sectional area of the upper drainage ports (8) is A, and the cross-sectional area of the lower drainage ports (7) is A, then the relationship is A1>A1.

The parts located inside the jacket (3) at both ends of the cylindrical body (2), the entry side guide part (5) and the exit side 7 guide part (6) are respectively located inside the jacket (3). and cylinder (2
) constitutes an annular nozzle (9) that communicates with the inside. This nozzle (9) opens inward of the cylinder (2) and is concentric with the axis of the cylinder.

According to the cooling pipe +1) according to the great invention, cooling water at a predetermined pressure is supplied into the jacket (3) through the supply pipe (4), and the cooling water is supplied from the annular nozzle (9) to the cylindrical body (2). ) is ejected inward. The ejected flow from this nozzle (9) flows toward the center of the cylinder (2), collides at the center, and tends to fill the cylinder (2). At this time, a part of the cooling water is discharged from the drain port (7), but the remaining part of the supplied cooling water is discharged from the openings at both ends of the cylinder (2), and the water flows through these openings. Fulfill.

As a result, the inside of the cylindrical body (2) is quickly filled with cooling water and reaches an immersed state after the start of water supply. While this immersion state is reached, the air inside the cylinder (2) is drained from the upper drain port (8).
), there are no air bubbles inside the cylinder (2) in the immersed state.

Therefore, in the immersed state, the entrance guide part (5)
The wire material (101), which is a twisted wire rod or a steel bar, passes through the axial center of the cylinder (2) and travels, so that the wire material +10 is cooled while being immersed in cooling water.

In the cooling pipe (1), drain ports [8] +71 are provided on the upper and lower surfaces of the middle part of the cylinder body (2), and the total cross-sectional area A1 of the upper drain port (8) and the lower drain port ( 7) Total cross-sectional area A, and.

Since the relationship is A, ) A, the effective replacement rate of cooling water in the cooling pipe flj (discharge amount QeO of cooling water discharged from the water outlet +71 +81 relative to the amount of supplied cooling water Q8) +
/Q8). This substitution rate (,Q
By improving '//Q8'), the cooling water is quickly discharged while maintaining the immersion state, and the temperature of the cooling water does not rise partially in the cooling pipe +1i.

As a result, the average cooling water temperature inside the pipes is prevented from rising,
This not only improves the cooling capacity but also ensures uniform cooling in the longitudinal direction of the rolled material.

Here, if we have the relationship A, )A, why is the effective substitution rate (
Q0/8. ) will be improved.

This relationship between A and )A was determined through experiments. The results of this experiment are shown in FIG.

The one shown in Figure 2 has an inner diameter of 90+m and a total diameter of 1000m.
Total area A+ of the drain ports (8) provided in the longitudinal direction of the upper side of the bait cooling pipe cylinder body (2) = 2375 tea, total area A of the drain ports (7) on the lower side = 100- Effective replacement rate (Qe) of cooling water for each cooling water supply amount (Qs)
/, B), and.

Total area A1 of the upper drain port (8) = 100 yl, total cross-sectional area A of the lower drain port (7), = 2375 - Effective replacement rate of cooling water when closed (Q0/, 8) - In the example be.

As is clear from Fig. 2, in the case of <s A+> AH.

The effective replacement rate (Q0/, ll) of cooling water depends on the amount of cooling water supplied (Qs), and the replacement rate increases as the amount of cooling water increases, but in the case of A, )A, the effective replacement The rate is almost independent of the amount of cooling water, and the effective replacement rate is larger than in the case of A, >A, for any cooling water supply jfr(Qs).

Table 1 shown below is a tabulation of the experimental results,
A1) This figure shows the increase in the effective substitution rate in the case of A, and in the case of A,)A.

[Next leaf]

Table 1 Cooling water supply amount (Qs) and effective replacement rate (QV) of immersion type cooling pipe From the above Figure 2 and Table 1, cylinder body (2)
By providing a drain port t7) (8) that becomes A,)A, effective replacement of cooling water during immersion cooling is further promoted.

A high effective replacement rate can be obtained even in a low cooling water flow rate range.

Therefore, in a wider cooling water flow range after the immersion condition has been reached (i.e., above Q m).

In particular, the uniformity of cooling in the longitudinal direction of the rolled material (lO) is improved.

However, the value of AI is set so that the immersion cooling state can be realized (
If At is too large, water will not accumulate in the cooling pipe (1))
In addition, the values of A + A need to be determined so as to ensure a large effective replacement of cooling water (if As 1 A is too small, the effective replacement rate of cooling water will decrease).

Incidentally, the great invention is not limited to the above embodiments,
The number of drain ports +7+, +8) may be set as appropriate.

According to the great invention, even if the length of the cooling pipe becomes long, the effective replacement rate of cooling water can be improved, the cooling capacity can be improved, and the wire material can be cooled uniformly in the longitudinal direction. .

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a cooling pipe showing an embodiment of the great invention, and FIG. 2 is a graph showing the relationship between the supply flow rate (Qa) and A, , A, which is less than the effective replacement rate. (1)...Cooling pipe, (2)...Cylinder, (7)...
Lower drain port, (8)...Upper drain port, (9)...Annular nozzle. Procedural amendment (spontaneous) August 31, 1980 l Case indication 1981 Patent application □100033. 2. Name of the invention: Immersion cooling pipe for wire rods and rod assemblies 3, and the case of the person making the amendment. Related 'MF issue 1 [i person (119) Legal company Kobe Seikansho 5 Date of notification of reasons for refusal I + 1 (Date of amendment order E 1) 7, Contents of amendment + 11 In the detailed answer, page 3, line 7 ``(Heat transfer coefficient)'' should be corrected as ``(Heat transfer coefficient).'''' is corrected to read ``A2 > AI for the case r A, >A.''.

Claims (1)

[Claims] Top: Cooling water is jetted inward from annular nozzles provided at both ends of a cylinder having a horizontal axis, concentrically with the axis, to fill the inside of the cylinder with cooling water. In the cooling pipe for immersion cooling the wire rod or steel bar that runs through the axial center of the cylinder, one or more drainage ports are provided along the longitudinal direction on the upper and lower surfaces of the cylinder. A wire rod characterized by
Immersion cooling pipe for steel bars. λ Cooling water is jetted toward the inside of the cylinder from annular nozzles provided at both ends of the cylinder having a horizontal axis concentrically with the axis to fill the inside of the cylinder with cooling water. In a cooling pipe that immerses and cools a wire rod or steel bar that runs through the core, there are
Or an immersion cooling pipe for wire rods and steel bars, characterized in that two or more drainage ports are provided, and the relationship between the total cross-sectional areas A1 and 51 of the upper and lower drainage ports is A, )AX.