JPS6257707A - Guiding device for hot rolling material - Google Patents

Abstract

PURPOSE:To prevent the defective rolling by the clogging of a rolling material by providing roller guides to the inlet and outlet of a side looper 5 between rolling mills to restrain the rolling material so that the rolling material progresses correctly. CONSTITUTION:The roller guides 10, 11 consisting of guide rollers and friction guides are provided to the inlet and outlet of the side looper 5 between the rolling rolls 1 and 1' of a continuous hot rolling device for a wire or steel bar. The rolling material 8 which is emitted from the rolls 1 and is guided by a delivery guide 3 and a guide cylinder 4 is thereby restrained to progress correctly so that the rolling material is guided without being twisted in the course up to the next stage of the rolling rolls 1'. The defective rolling by the clogging of the material 8 is thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application This invention relates to a guiding device for rolled steel in a series continuous hot rolling mill.

BACKGROUND OF THE INVENTION As a hot rolling apparatus for steel wire rods and steel bars, an apparatus is used in which a large number of rolling mills with the axes of the rolling rolls made perpendicular to each other are arranged in series to roll the steel material in multiple stages. Generally, a steel material is rolled into a round (or square) and an oval cross section alternately to reduce the cross section and become a steel bar or steel wire, as shown in FIG.

A part of this type of hot rolling equipment is shown in FIG. That is, as shown in FIG. 2, a rolled material (8) (in the middle of rolling) having a round cross section is guided into the caliber (groove) of the roll (1) by a roller entry guide (2) and rolled into an oval cross section. The rolled material with an oval cross section is delivered by the delivery guide (3),
Through the guide tube (4) it enters the guide tube (45) and is rolled into a round by a rolling roll (1') with an axis perpendicular to the previous roll (1) guided by a roller entry guide (2) of the same construction. In this case, the long axis of the oval cross section must be guided and held exactly at right angles to the axis of the rolling roll (1').

Roller entry guides (2) and (2') guide the rolled material by sandwiching the steel material between two opposing grooved guide rollers, and roll the steel material smoothly and accurately without damaging the steel material or with less friction. It is something that can be induced. That is, as shown in the front sectional view in FIG. 4 and in the A-A sectional view in FIG.
Insert the friction guide (-) into the box (A) to which the support (-) that supports the roller entry guide is attached, and attach the roller entry guide to the main surface f2]) with bolts. It is fixed by (c). According to this roller entry guide, the rolled material passes through the hole-shaped passage formed by the friction guides (A), -, in the direction of the arrow in the drawing, and then passes through the guide rollers (C),
- is guided by the grooves and guided accurately to the caliper of the rolling roll. This kind of roller entry guide is
For example, it is a well-known product sold and used by "MORGARD SHMMAR" and others.

A side looper (5) is provided between both rolling rolls, and when the tip of the steel material runs linearly and is bitten by the next rolling roll (1'), the kicker roller (6) moves to the position indicated by the dotted line in the drawing. (in the direction of the arrow) to push the rolled material in that direction, and the rolled material runs in the side looper (5) between the fulcrum rollers (7) forming an arc-shaped loop as shown by the dotted line. Inside the side looper (5) is HM PD (
9) (Hot Metal Po5ition De
tecter ) is provided to detect the height and size of the loop (arc) and control the rolling speed of the rolling rolls (1), σ) so that the height of the loop is constant. By forming the loop in this manner, continuous rolling without tension is performed. Further, in order to form a loop, the distance between the rolling rolls (1) and (1') is usually 3772 mm or more.

8. Problems to be Solved by the Invention However, in the conventional rolled material guiding device described above, when rolling operations are repeated, the bottom plates of the guiding tube (4) and side looper (5) wear out, and the tip of the rolled material with an oval cross section becomes twisted. It is not guided correctly to the next stage roller entry guide (2'),
If the steel material becomes clogged, it will not only result in poor rolling of the steel material, but in that case, the next rolling operation will not be possible unless the rolled material is removed, which has the disadvantage of seriously impairing the efficiency of the rolling operation. This drawback increases as the distance between the rolling rolls increases due to the provision of side loopers, or in the case of thin rolled materials such as wire rods.

20 Means for Solving the Problems This invention provides a rolling machine as described above.
) is characterized by a roller guide αO provided at the tip of the roll, which restrains the rolled material that has come out of the roll and exited the delivery guide (3) and guide tube (4), so that it can be accurately rolled. The above-mentioned drawbacks of this type of rolling mill are solved by guiding the rolling mill to the guide tube (4) of the rolling roll. In this case, the guide tube (45
It is even more effective to provide a roller guide before the rolling material (8) to guide the rolled material (8).

The guide roll used for the roller guide (also the roller entry guide) may be made of carbon steel, but if the rolling speed increases, it is better to use a sintered body of WC-Co alloy (cemented carbide) or SiN.

The present invention will be explained below with reference to the drawings.

FIG. 1 shows an embodiment of the invention.

The rolled material (8) is guided by the roller entry guide (2) and rolled into an oval cross section by the rolling rolls (1). The rolled material (8) with an oval cross section is delivered by the delivery guide (
3), exits the guide tube (4), passes straight through the side looper (5) guided by the roller guide (10) provided at the exit of the guide tube (4), and passes through the roller guide α provided there. It is guided by the guide cylinder (4'), guided by the roller entry guide (2') of the next rolling mill, bitten by the rolling roll (f), and rolled.

A side looper (5) is provided between both rolling rolls (1) and σ), and when the tip of the rolled material (8) is bitten by the rolling roll (1), it is kicked by the hard roller (6) and follows the dotted line in the drawing. Create a loop between the fulcrum rollers (7) as shown, and adjust the height of the loop to HMP D inside the side looper.
(9) to detect and control the speed of the rolling roll,
As is conventional, tensionless rolling is thereby performed.

When this guidance device is used, the rolled material with an oval cross section (especially the tip) rolled by the first stage rolling rolls is moved into the guidance tube (4).
At the exit of the roller guide αQ, it is restrained by the roller guide αQ and moves forward while maintaining the correct position, so it exits the side loop parlor and enters the next roller guide 0]), guide cylinder (4) and roller entry guide (2') without being twisted. It is guided correctly and the rolled material does not get clogged.

In this case, the effect of the roller guide αO is particularly large, and the roller guide αυ has the effect of increasing this effect and guiding the rolled material to the second rolling roll (1') more accurately.

E. Example The following table shows the trends in the rolling defect rate when a continuous wire rod rolling mill with a serial side-route zf- using a conventional induction device was used and after it was modified to the induction device of the present invention. there were. Here, the rolling defect rate is the ratio of the number of steel pieces of the wire rod that has been rolled to the number of steel pieces fed into the rolling machine, which is subtracted from 1.

From the results above, it can be seen that the rolling defect rate is significantly reduced when the induction device of the present invention is used. Reducing the defective rate due to wire rod clogging during rolling not only reduces the number of defects, but also greatly improves the operating rate of the rolling equipment and significantly reduces rolling costs.

Effects of the Invention As explained in detail above, the present invention provides continuous hot rolling equipment for wire rods or steel bars in which a large number of rolling mills with their axes at right angles to each other are successively arranged in series. This is a rolling material guiding device characterized by a roller guide provided at the entrance of the looper, and the roller guide properly restrains the rolled material coming out of the previous rolling roll and prevents it from twisting on the way to the next rolling roll. Therefore, rolling defects due to clogging of the rolled material are prevented.

Furthermore, if a roller guide is provided at the exit of the side looper, the effect will be greater.

That is, when used for rolling mild steel wire rods, hard steel wire rods, steel bars, etc., for example, it is effective in reducing the rolling failure rate of serial continuous rolling equipment having side louvers and improving the operating rate of the equipment.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a plan view of a conventional apparatus, and FIG. 3 is a drawing showing a series of cross sections (calibers) during rolling of steel materials. FIG. 4 is a front sectional view of the roller guide, and FIG. 5 is a sectional view taken along line A-A. (1), (1)...Rolling roll, (2), <i>, -roller entry guide, (3)...Delivery guide, (4), (4
')...Induction tube, (5)...Side louver, (
6)...Kitsuka roller, (7)...Fully point roller, (8)...Rolled material, (9)-HM P D (
Hot Metel Po5ition Detect
er), 0*, 0υ...Roller guide, Qυ...Main surface, (A)...Box,
(C) Support body, (C) Roller shaft, (A), j... Guide roller, (1), i... Friction guide, slope... Bolt. Agent Patent Attorney 1) Rio NakaFigure 1Figure 2Figure 3Figure 5

Claims (1)

[Scope of Claims] 1. In a device for guiding the rolled material of continuous wire or bar rolling equipment arranged in series with a side looper in the middle, a roller guide is provided at the entrance of the side looper to restrain the rolled material. The hot rolled material guiding device 2 is characterized in that the hot rolled material is made to progress correctly by rolling the material, and the hot rolled material according to claim 1 is characterized in that a roller guide is provided at the exit of the side looper. The guidance device 3 for hot-rolled material according to claim 1 or 2, characterized in that the guidance device 3 is used in rolling equipment in which the distance between rolling rolls is 3 m or more.