JPH0386308A - Method for measuring mill constant of edge rolling mill for shape steel - Google Patents

Abstract

PURPOSE:To easily measure the mill constant of an edge rolling mill by pushing a gage block whose section is of an H shape and whose flange tip is in a tapered shape into an edge rolling mill at its tip part by a universal rolling mill. CONSTITUTION:A gage block 7 is in an H shape at its section and the length L is taken about double the interval of an edge rolling mill 3 and a universal rolling mill 5 at least. For the measurement of a mill constant the gage block 7 is inserted to the universal rolling mill 5 from the opposite side of the edge rolling mill 3, the web equivalent part thereof 7b is held by upper and lower horizontal rolls 4 and fed into an arrow mark lower direction while rotating a motor 8. Then, a tapered part 7c spreads the roll gap of the drum shaped roll 2A of the edge rolling mill 3. The value of the roll gap is calculated from the push-in quantity of this time and the elongation of the edge rolling mill 3 is found. On the other hand, the load is measured by a load detector 9 and the mill constant is calculated from the relation with the elongation quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for measuring mill constants of edger rolling mills for section steel.

<Prior art> Conventionally, as shown in Fig. 3, a method for measuring the mill constant K of a 20-mill rolling mill involves rolling a rolled material l by a pair of upper and lower rolling rolls 2 to obtain a plate thickness h. It is generally expressed by the following (+) formula from the rolling load P and the actual roll opening S6 during rolling, and the roll opening S6 before rolling (for example, JP-A-63-140720 (see official bulletin)
.

S-(P/K)+s,...-(1) Where, K: Mill constant By the way, for example, the Edger rolling mill used in the H-beam rolling equipment disclosed in Japanese Patent Application Laid-Open No. 60-68104 In this case, as shown in FIGS. 4(a) and 4(b), there is a pair of upper and lower drum-shaped rolls 2A that roll down the end face of the flange 1r of the H-section steel IA, and a pair of upper and lower horizontal rolls 4a. A universal rolling mill having a pair of left and right vertical rolls 4b [
However, it has not been possible to measure the mill constant of this edger rolling mill 3 for the following reasons.

■ The buckets of the upper and lower pair of rolls 2A of Etsujia rolling Ia3 are not flat but drum-shaped, and there is a W between the rolls 2A.
Since the through guide 6 is provided, it is not possible to bring the rolls into direct contact with each other and apply a load.

(2) Therefore, it is conceivable to apply rolling down by sandwiching a gauge plate between the rolls 2A, but since the capacity of the roll rolling down device is low, it is not possible to apply a large load.

<Problems to be Solved by the Invention> The present invention has been made to solve the above-mentioned problems, and provides a method for easily measuring the mill constant of an edger rolling mill having an hourglass-shaped roll. The purpose is to

<Means for Solving the Problems> The present invention provides a rolling mill that penetrates between a pair of upper and lower drum-shaped rolls that are installed close to a universal rolling mill that has a pair of upper and lower horizontal rolls and a pair of left and right vertical rolls that roll a section steel. A method for measuring mill constants of an edge rolling mill having a guide, in which a gauge block having a cross section of 1 shape and a tapered tip of the flange width is rolled by a horizontal roll of the universal rolling mill. is pushed into the hourglass-shaped roll, and the pushing amount of the gauge block at that time and the load applied to the edger rolling mill are simultaneously measured, and a mill constant is determined from these measured values. This is a method for measuring Mill's constant.

<Function> According to the present invention, a gauge block having an H-shaped cross section and a tapered tip is installed between the hourglass-shaped rolls of the edger rolling mill, which is installed close to the universal rolling mill. Since horizontal rolls are used for pushing, the mill constant can be calculated from the pushing amount of the gauge block and the measured value of the load applied to the edger rolling mill.

As a result, there is no need to increase the capacity of the rolling device as in conventional methods, and it is possible to accurately measure the mill constant without being handicapped by the roll shape of the drum-shaped roll or hindered by the penetration guide. It is.

<Examples> Examples of the present invention will be described in detail below with reference to the drawings.

FIGS. 1(a), 1(b), and 1(C) show the structure of a gauge block according to the present invention.

As shown in the figure, the gauge block 7 has an H-shaped cross section, and its length L is at least 813
It is said that the distance is approximately twice that of the universal rolling distance of 1!15.

The height h of the flange equivalent portion 7a is set to be higher than the minimum flange width of the rolled material, and the thickness d may be a value that does not buckle under the maximum rolling load. Further, the width W of the web equivalent portion 7b is set to a value that is slightly larger than the width of the left and right penetration guides 6, and the thickness e thereof does not need to be particularly limited.

The height g of the tapered portion 7c of the flange-equivalent portion 7a is determined by the following [
2) It can be determined by the formula.

K" Here, Km is the predicted value of Mill's constant. Also, the length l from the tip of the tapered part 7C is as shown in (3) below.
The value is determined by the formula.

1-'A (h g ) xlOO-=----
(3) Furthermore, the angle θ of the tapered portion 7C is θ=jan −' (1/100) −
−−−−−=−(4).

Further, in the width direction of the thickness d of the tapered portion 7c, an inclined surface having the same angle φ as the surface of the drum-shaped roll 2A of the edge rolling H3A is provided.

A procedure for measuring the mill constant of edge rolling R3 using the gauge block 7 configured as described above will be described.

■ First, as shown in Fig. 2, the gauge block 7 is pushed into the universal rolling mill 5 from the opposite side of the edge rolling mill 3, its web equivalent portion 7b is sandwiched between the upper and lower horizontal rolls 4, and the motor 8 is rotated. While doing so, feed it in the direction of arrow F.

(2) The tapered portion 7c of the gauge block 7 is pushed between the two hourglass rolls of the edger rolling mill 3, and gradually expands the roll gap between the hourglass rolls 2A.

(2) Calculate the roll gap value of the hourglass roll 2A from the pushing amount of the gauge block 7 at this time, and determine the elongation amount of the edge rolling la3.

Now, if the pushing amount is L + (ms) and the roll gap value at that time is G (M), the elongation ls is as follows (5)
It is determined by the formula.

5=G=2 Ll tan θ −−−−−−−
-- 45) Calculate K.

Now, assuming that the obtained load value is P (kg), the Mill constant can be determined from the following equation (6) from the relationship with the above-mentioned equation (0).

K-P/S −・・・・・−・・−−
(6) In this way, by using the gauge block 7, the hourglass-shaped roll 2A0)ξ constant K can be easily calculated.

In addition, if this gauge block 7 is used, the edge rolling Ia3 can be preloaded.

That is, the gauge block 7 is pushed between the hourglass-shaped rolls 28 of the edge rolling 813 by a predetermined pushing amount or until a predetermined load is reached.

As a result, since the taper angle θ of the gauge block 7 is known, the preload position can be accurately centered by using the above equation (5).

<Effects of the Invention> As explained above, according to the present invention, the mill constant of an hourglass roll can be easily calculated by using a gauge block. It is possible to roll with high precision, greatly contributing to improving product yield.

[Brief explanation of drawings]

FIG. 1 shows the configuration of a gauge block according to the present invention (
a) Side view, (b) A-A sectional view, (c) B-B sectional view, Fig. 2 is a side view schematically showing the state in which the gauge block is mounted on the edger rolling mill, and Fig. 3 is , a side view showing a method for measuring the mill constant of a 20-mill rolling mill, FIG. 4 is (a) a perspective view showing a conventional example of an edger rolling mill, (b) CC
It is an arrow view. IA... ■1 section steel, 1f... flange,
1w...Web, 2A...Trumpet-shaped roll,
3... Edge rolling m, 4... Horizontal roll,
5... Universal rolling mill, 6... Penetration guide, 7... Gauge block, 8... Motor, °9... Load detector.

Claims (1)

[Claims] A method for measuring mill constants of an edger rolling mill having a penetrating guide between a pair of upper and lower drum-shaped rolls installed close to a universal rolling mill having a pair of upper and lower horizontal rolls and a pair of left and right vertical rolls for rolling section steel. Then, a gauge block having an H-shaped cross section and a tapered tip of its flange width is pushed into the drum-shaped roll by the horizontal roll of the universal rolling mill, and the gauge block at that time is A method for measuring a mill constant of an edger rolling mill for section steel, characterized by simultaneously measuring the indentation amount and the load applied to the edger rolling mill, and determining the mill constant from these measured values.