JPS6330102A - Rolling method for shape having flange - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for rolling flanged, ie H-shaped, channel-shaped and similar fully curved or non-metallic profiles.

(Prior Art) The shapes currently manufactured have a wide variety of types, cross-sectional shapes, and dimensions, and there are only a large number of them in one type and size. In conventional rolling methods, it is necessary to prepare a wide variety of rolling rolls and guides attached thereto in order to handle the wide variety of products, types, and sizes. As a result, product costs are high due to the production of large quantities of rolls and frequent recombination of rolls, and there are problems in that it is not easy to meet customer needs such as diversification of product dimensions and expansion of manufacturing range. .

Therefore, the applicant of the present invention proposed a method and apparatus for rolling a shaped material having a flange, which makes it possible to produce a wide variety of shaped materials using diagonal rolls (Japanese Patent Application No. 511
77:191 and Japanese Patent Application No. 1983-11099).

According to this rolling method, the intermediate rolling process and the finishing rolling process are carried out using oblique rolls that are in contact with the inside of the flange of the material and whose roll axes are tilted at a predetermined angle with respect to a direction perpendicular to the rolling direction. Placed at any step between. and,
The skew roll spreads the web in the width direction by engaging the flange with the web.

(Problems to be Solved by the Invention) However, in the above rolling method, pairs of diagonal rolls that form an upper and lower pair must be arranged with intervals left and right, that is, the rolling mill has four diagonal rolls. I need. In addition, it is necessary to adjust the inclination angle of the single roll roll, the amount of web reduction, and the roll opening degree according to the shape and dimensions of the section to be rolled, and these adjustment ma4Ii must be provided. A rolling mill equipped with a skew roll, its rotation drive device, and the above-mentioned adjustment mechanism has a large and complicated structure.

Therefore, the present invention aims to improve the above-mentioned conventional rolling method, to simplify the structure of the rolling mill, and to provide a rolling method that can be miniaturized and usable.

(Means for Solving the Problems) The method of rolling a section having a flange according to the present invention is such that the horizontal plane projection line of the roll axis is inclined at a predetermined roll cross angle with respect to a plane perpendicular to the rolling direction, and A pair of diagonal rolls facing each other and below are arranged with a predetermined roll opening degree on the left and right, and the upper and lower diagonal rolls pinch the part of the web of material near the flange, and the outer surface of each diagonal roll. The web is rolled by pressing the inner side of the flange of the material outward to expand the web in the width direction. Then, one of the upper and lower skew roll pairs is rotationally driven, and the other skew roll is not driven to roll the shape material.

The material to be subjected to this rolling has been previously rolled into a shape having a web S and a flange, for example, through a rough rolling process and an intermediate rolling process. The material of the rolled material is a non-ferrous metal such as an aluminum alloy, steel, or a non-metallic material such as plastic.

The 31 joints of the roll cross angle are set, for example, by rotating the housing that rotatably supports the nailing roll around a vertical axis using a rack and pinion mechanism, and the roll opening degree is adjusted by rotating the housing rotatably around the vertical axis using a screw mechanism or the like. This is done by moving in and out of the rolling pass line. Further, the web reduction amount is adjusted using a screw type or hydraulic type reduction mechanism as in the normal reduction amount section 7A. The roll cross angle, roll opening degree, web reduction amount, etc. may be changed continuously or intermittently during rolling, or may be kept at a constant value. The width of the web is widened by compressing the web with the circumferential surface of the row roll, and the width of the web is also widened by pressing the inner surface of the flange with the outer surface of the row roll. These two web widening machine runs can increase the web width either individually or in combination. The web widening function changes according to the roll cross angle of the skew rolls, the roll opening degree, and the web reduction amount. Therefore, it is possible to obtain a profile with a number of shapes and dimensions depending on the amount of adjustment of these roll cross angles. Since only one of the pair of upper and lower oblique rolls is rotationally driven, the driven oblique roll bears most of the rolling torque, and the peripheral speeds of the subordinate oblique rolls are different from each other. As a result, as explained by the well-known rolling theory shown in FIG. 8, the direction of frictional force acting on the roll surface becomes asymmetric between the upper and lower rolls, resulting in a lower friction hill. That is, the pressure acting on the roll surface is reduced, and the rolling load is reduced. However, the rolling torque can also be small.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a plan view showing a state in which an H-section steel whose web width changes continuously is being rolled by diagonal rolls, and FIG. 2 is a front view of FIG. 1.

As shown in these drawings, pairs of upper and lower lid skew rolls 11 and 12 are arranged at intervals laterally.

As shown in FIG. 1, each oblique roll 11, 12 is directed toward the upstream side of the rolling bath at a roll cross angle α with respect to the horizontal plane projection line of the roll axis S or a plane perpendicular to the traveling direction of the material 1. The roll cross angle α can be changed arbitrarily. In addition, as shown in the front view of No. 2 f, N, the vertical plane projection line of the roll axis S is inclined toward the opposite side to the rolling bath at a roll inclination angle β with respect to the horizontal plane, and the roll inclination angle β can be changed to f.

As mentioned above, oblique roll I! , 12 have a structure in which the axial direction of the rolls can be freely changed three-dimensionally. For this purpose, for example, the entire housing containing the diagonal roll chock is rotated 6T IQ on a vertical axis on a support, and a cotter with the required taper is inserted between the housing and the chock. Further, these oblique rolls are rotated by an electric motor via a telescopic spindle, a speed reducer, and the like.

Next, rolling by the skew rolls 11 and 12 will be explained using the plan view of FIG. 1.

The center line of the H-shaped inlet material 1 in the advancing direction is the X axis, and the direction perpendicular to this is the y axis. Circumferential surface 1 of oblique roll 11°12
3 rolls down the web 4 of the input rolled material 1 having an H-shaped cross section from above and below, a driving force F8 in a direction forming an angle α with the X axis is applied to the web 4. As a result, the component force FL of the propulsive force FR or the rolled material l is pulled in the traveling direction, and the propulsive force FI
The component force FC of I stretches the web 4 in the width direction. Also,
The outer surface 15 of the skew rolls II, 12 comes into contact with the inner surface of the flange 5 of the input rolled material I, and acts as a force to spread the inner surface of the flange in the web width direction. Due to the synergistic effect of these two web widening actions, the web 4 is easily and efficiently stretched in the width direction y.

The above web widening amount is determined by the roll cross angle α of the skew rolls 11 and 12, the distance L between the left and right skew roll pairs (point O on the outer surface of the 4th row roll from the intersection Z of the skew roll axis S shown in FIG.
It can be adjusted by three factors: the distance to
1).

In addition, as shown in the front view of FIG. 2, the oblique roll axis S can be made parallel to the horizontal plane, and can also be changed to an arbitrary roll inclination angle β. By appropriately combining the roll cross angle α and the roll inclination angle β, it is possible to control the pattern of the contact surface between the outer surface 15 of the oblique rolls 11, 12 and the inner surface of the flange of the rolled material l.

for example.

In the case of H-beam steel with a wide flange, the difference in the amount of displacement in the flange width direction, that is, the difference in the amount of displacement in the part near the web 4 and the tip of the flange 5, becomes large with only the widening effect of the roll cross angle α. If the shape of the rolled material l is easily distorted, a proper shape can be obtained by setting the roll inclination angle β.

The web widening I5 is ensured by the material of the web section close to the flange that has been rolled down and the material that has been stretched across the entire web in the width y direction.

Of these, the material of the former portion rolled down by the rolls (hereinafter referred to as surplus material) is formed in advance in a previous step of the main rolling device and is supplied to the main rolling device. A typical example of the shape of the extra thickness is shown in FIG.

A taper T is attached to the rolled material IA at a portion of the web 4 near the flange S, and this occupies most of the excess thickness. The boundary with the flange 5 is basically configured with a radius r determined on the premise that there is only the minimum necessary contact with the roll.

The rolled material IB is composed of the excess thickness or the rounded R part at the boundary between the web 4 and the flange 5, and the rolled material 1G is composed of the excess thickness or the taper T and the radiused part attached near the flange 5 of the web 4. This is a case where it is configured by both R.

Is it possible to widen the web using any of these three types of excess thickness shapes? Strictly speaking, the shape of the boundary between the web 4 and the flange 5 in the longitudinal direction of the product cross section after widening differs depending on the amount of width widening. Then, the desired H-beam steel can be manufactured by using different types of steel depending on the required quality when used in structures.

No. 4 [A] shows an example of a row of rolling equipment in which the method of the present invention is implemented.

As shown in the drawing, the rolling equipment row consists of a breakdown 6, an intermediate universal rolling mill 7, an edger 8, a skew roll rolling mill 9, and a universal finishing mill filO arranged in sequence. The material to be rolled is pre-rolled by a breakdown 6, an intermediate universal rolling mill 7 and an edger 8 into a shape having a web and flanges. Then, the material to be rolled is bitten into the skew roll rolling mill 9 by the inertial energy given when it is sent out from the edger 8 on the upstream side. The universal finishing mill 10 rolls the material rolled as described above by the rolling roll mill 9,
Finish to the required dimensions and shape.

Here, in the rolling mill shown in FIGS. 5 to 7, the rotational drive of the oblique rolls and the adjustment of the roll cross angle α, the amount of web reduction, etc. will be described in detail.

Rotational Drive of Diagonal Rolls In this embodiment, as shown in FIG. 5, only the lower skew roll 12 is rotationally driven, and the upper skew roll 11 is not driven.

As shown in FIG. 6, from the main motor 60 to the reducer 61
The rolling power is transmitted to a power transmission shaft 63 from this shaft to a pinion (not shown).

It is transmitted to gear 64 and from gear 54 to universal spindle 65, roll shaft 27, and skew roll 12.

In this device, the power transmission shaft 63 and the pinion are structured to be slidable in the roll axis direction. Since such a structure is commonly used, it is not particularly illustrated. Note that the power transmission 4ib6] is installed on the ground or on the sole plate 55, and is fixed. A distribution gear device incorporating a pinion and an i-wheel 64 is attached to the shift frame 40, and moves along with the stand 19 on the sole plate 55 in the roll axis direction according to the skew roll width.

For the stand 19 loaded on the shift frame 40,
The positional relationship with respect to the gearing device changes depending on the roll cross angle α and roll inclination angle β of the oblique rolls. Eccentricity and deviation due to this are absorbed by the universal joint 65, and power is transmitted smoothly. Note that a constant velocity ball joint may be used instead of the universal joint 65 depending on the magnitudes of the angles α and β.

A stand 19 supporting the adjusting oblique rolls 11 and 12 with a roll cross angle α is mounted on the shift frame 40. The roll cross angle α is set by rotating the ohm wheel 41 attached to the stand I9 via the roll cross angle setting motor 43 (see figure 546) attached to the shift frame 40 via the ohm 42 (see figure 7!!). At this time, the wedge-shaped clamp device 53 is loosened between the stand 19 and the shift frame 40 in order to rotate it.This wedge-shaped clamp device 53 is used to hold the stand 19 and the shift frame 40flfI when not adjusting the roll cross angle α. This is to ensure a strong connection.

The lowering motor 21 is driven with the roll inclination angle β adjustment clutch 26 disengaged. As a result, the ohm 22, the ohm wheel 23, the reduction screw 24, and the ohm wheel 23 on the side that is bent from the skew rolls 11 and 12 are moved. Through the nut 25, the diagonal rolls 11, +2
The chock 29 on the more distant side is moved downward and the incision is made by the roll inclination angle β. At this time, the chocks 28 and 29 smoothly slide against the reduction screw 24 via the spherical seats and move toward the furnace. Note that the axial force applied to the oblique rolls 11 and 12 is supported by the stand 19 via a chock 29.

Adjustment of roll opening degree The shift frame 40 is loaded on a sole plate 55 installed on the ground so as to be movable in the direction of the axis of the oblique roll and fixedly held vertically and horizontally. Also,
A hydraulic cylinder type clamp device 53 attached to the shift frame 40 fixes the shift frame 40 to the sole plate 55.

This clamp device 53 is used to adjust the roll opening degree to JA.
is released, and the screw shaft 5o is rotated by the width setting motor and reduction gear 52 shown in FIG. Square-shaped nuts 1 to 51 shown in FIG. 7 are attached to this screw shaft 5o, and this nut 51 is mounted on the stand frame 40 so as not to rotate. Therefore, by rotating the screw shaft 50, the stand frame 4o moves on the sole plate 55 in the direction of the roll axis force.

Adjustment of the amount of web reduction To adjust the amount of web reduction (roll gap of the skewed rolls 11, 12), the clutch 26 is operated by iI! The machine is kept in a closed state, and the rolling down motor 21 is driven according to the thickness of the finished product.

The ohm wheel 23 and the reduction screw 24 that carry this driving force
, Natsu 25, Chock 28.29. It is transmitted to the roll shaft 27 through the , and the roll shaft 27 is moved up and down while remaining parallel.

Although the above description has been made regarding H-shaped steel, the present invention can be similarly applied to other shapes having flanges, such as channel steel, ■-shaped steel, and steel sheet piles, which are rolled to widen the inner width of the web. Of course, the present invention can also be applied to materials other than hot-worked steel, such as aluminum or plastic.

(Effects of the Invention) According to the present invention, one of the upper and lower oblique rolls is rotationally driven and the other oblique roll is not driven to roll the profile material, so a cam waltz is not required. becomes. Further, due to the different speed rolling, the roll driving force can be small. Due to these factors, the drive system, and therefore the entire rolling mill, has a simple and compact structure.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the state in which an H-beam steel whose web width changes continuously is being rolled by diagonal rolls, and Fig.
3 is a cross section IN showing an example of the material to be subjected to the above-mentioned rolling, FIG. 4 is a schematic view showing an example of a row of rolling equipment in which the method of the present invention is carried out, and FIG. 5 is the above-mentioned FIG. 6 is a partial cross-sectional front view of a rolling mill for rolling H-section steel, FIG. 6 is an overall plan view of the rolling mill shown in FIG. 5, and FIG. 7 is a partial cross-sectional side view of the base of the rolling mill shown in FIG. 5. and FIG. 8 are drawings for explaining the reduction in rolling torque in the present invention. 1... Rolled material, 2... Profile, 4... Web, 5
・-Fran'), II, 12...Diagonal roll, 13
・−・Surrounding surface of the skewed roll, 15 ・・−Outer surface of the skewed roll,
α...Roll cross angle, β-...Roll inclination angle, L.
...Roll spacing, S...Roll axis center.

Claims (1)

[Claims] The horizontal plane projection line of the roll axis is inclined at a predetermined roll cross angle with respect to the plane perpendicular to the rolling direction, and pairs of oblique rolls facing each other vertically are arranged with a predetermined roll opening degree left and right. Rolling is carried out by pinching at least the part of the web of material near the flange with a pair of diagonal rolls, and by pressing the inside of the flange of the material outward with the outer surface of each diagonal roll to spread the web in the width direction. In the method,
A method for rolling a profiled material having a flange, characterized in that the profile is rolled by driving one of the upper and lower skewed rolls to rotate and leaving the other skewed roll non-driven.