JPH02280901A - Method for rolling shape steel - Google Patents

Abstract

PURPOSE:To prevent the deterioration in size by misregistration and to obtain the high-accuracy shape steel by disposing penetration guides which come into contact with the flange width ends of a rolling stock between the inlet side and outlet side of a universal mill at the time of rolling down the rolling stock having a web and flanges by the universal mill to produce the shape steel. CONSTITUTION:The penetration guides of an integral type which come into contact with the flange width ends of the shape material h are disposed between the inlet side and outlet side of the universal mill combined with horizontal rolls 1 for pinching the web ha of the shape material h above and below and vertical rolls 2 for rolling down the flanges hb of the shape material h in the height direction of the web ha. The stock can be integrally guided and introduced from the inlet side to the outside side of the mill by this disposition and, therefore, the deterioration in the size by the misregistration at the time of the rolling is averted and the shape steel having the high accuracy is obtd.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention avoids deterioration in dimensional accuracy that is inevitable when manufacturing H-shaped, groove-shaped, or ■-shaped steel sections by rolling, and This paper proposes a rolling method that allows the web height of a rolled material to be freely adjusted within a rolling window and that allows the production of a shaped steel product that always has a constant web height. The following will explain the case of rolling an H-section steel as an example.

(Prior art) Conventionally, when H-beam steel is manufactured by rolling, there have been techniques such as providing guides on the entry and exit sides of the rolling mill, as shown in Japanese Utility Model Application No. 53-29736, for example. Since such guides have a split structure, they cannot guide the center part of the rolling rolls, that is, the rolling part of the rolled material, and during rolling, misalignment of the guide and the rolled material is unavoidable, resulting in unsatisfactory shaped steel products. We have not yet reached the point where we can obtain . In addition, when manufacturing H-beam steel by rolling (hereinafter referred to as roll H), rolls of the same width are used at the same rolling chance, so the internal width of the H-beam can be kept constant, but cross-sectional dimensions such as flange thickness When changes are made, or when the wear on the roll end face of the rolling roll becomes large, the web height changes accordingly, so there are many cases where the nominal dimensions and web height do not match even though they are in the same series. Ta. When manufacturing H-shaped steel by welding (build-up H), thick plates of a predetermined size are used, so even if the cross-sectional dimensions change in the same series, the web height remains constant. However, in the roll H as described above, it was necessary to frequently reassemble the rolling rolls and guides corresponding to the cross-sectional dimensions of the H-section steel to be obtained.

For example, Japanese Patent Application Laid-Open No. 1983-1989 is a document related to rolling of H-beam steel.
Japanese Patent No. 178101 discloses a rolling method in which the web portion of a profile is partially rolled and the web height can be freely adjusted without replacing rolling rolls or the like.

(Problem to be solved by the invention) By the way, the above publication (Japanese Patent Application Laid-open No. 178101/1983)
In the technology disclosed in , the roll surface pressure during partial rolling is extremely large, resulting in local wear of the rolls;
Further, there is a problem in that the amount of width expansion is limited by the amount of protrusion of the web, and it is difficult to widen the width in areas where the web is thick.

Regarding this point, if the web of the section is rolled down in the height direction, a section steel with a constant web height can be manufactured without causing the above-mentioned problems. However, when such a rolling method is adopted, there is a concern that the flange moves up and down when the web height is reduced, causing the web center position to become unstable and resulting in shape defects. At present, it has not been established.

This invention aims to further improve product dimensional accuracy by preventing shape defects, that is, deviation of the web from the flange width, which occurs when manufacturing section steel by rolling. It is an object of the present invention to propose a new rolling method which does not suffer from the above-mentioned disadvantages, which are especially present in rolling methods with directional reduction.

(Means for Solving the Problems) This invention provides a method for producing shaped steel by rolling a rolled material having webs and flanges using a universal mill consisting of a combination of horizontal rolls and vertical rolls. A method for rolling a section steel, characterized in that a through guide is provided in contact with the flange width end of the material between the side and the exit side, and the rolled material is rolled under guidance by the through guide. It is. Further, the present invention provides a rolled material having a web and a flange, which is equipped with split rolls whose width can be changed and which sandwich the web of the rolled material between the upper and lower sides, and vertical rolls which roll down the web of the rolled material along with the flange in the height direction thereof. When manufacturing a section steel with a desired web height by passing it through a universal mill, a through guide is provided that contacts the width end of the flange of the rolled material between the input side and the exit side of the universal mill. This method of rolling a section steel is characterized in that rolling is performed to reduce the web height of the rolled material under the guidance of the through guide.

Now, FIGS. 1(a) and 1(b) are schematic diagrams of a universal mill suitable for use in carrying out the present invention, in which 1 is a horizontal roll that vertically sandwiches a web h of the profiled material, and 2 is a horizontal roll of the profiled material web h. a vertical roll that rolls down the flange hb in the height direction of the web h1;
Reference numeral 3 designates an integral through-hole guide which is disposed between the inlet side and the outlet side of the mill and comes into contact with the flange width end. Further, FIG. 2 shows another example suitable for carrying out the present invention, in which 1' is a divided roll whose roll width A' can be changed between upper and lower sides of a shaped web h. , 2' is a vertical roll that rolls down the flanges ht of the profile in the height direction of the web h, and 3' is fixedly held by the roll chocks of the vertical roll 2' and rolls down at least the width ends of both flanges of the profile. On the one hand, there are integral through-hole guides that are in contact with each other, and this through-hole guide 3' is also arranged between the inlet side and the outlet side of the universal mill.

(Function) When manufacturing sections from materials such as slabs, the third
As shown in the figure, the product is roughly formed into a predetermined shape in a breakdown mill 4, and then rolled through a rough universal mill 5, an edger mill 6, and a finishing universal mill 7 to a predetermined size. When a conventional type guide is installed in the finishing universal mill 7, it is not possible to guide the center of the roll of the universal mill during rolling, that is, the rolling part of the rolled material, and the web is not aligned with the flange width of the rolled material. Because of the uneven position, it was difficult to obtain shaped steel products with high dimensional accuracy. In this invention, the integrally constructed penetrating guide consistently guides and guides the rolled material from the entrance side to the exit side of the mill.
By guiding the web, the above-mentioned misalignment between the flange and the web can be avoided, and therefore there is no possibility of deterioration in dimensional accuracy.

In addition, in a rolling method in which the web height of the section steel is adjusted by changing the roll width of the rolling rolls, especially when rolling down the section web in the height direction as described above, the However, it is difficult to balance the rolling of the web and the flange, such as the center of the web being biased, resulting in web waves and non-uniform flange width, and there are concerns that the shaped material tends to meander during rolling.

However, in this invention, as shown in FIGS. 2(a) and (b) above,
As shown in FIG. 3, since the rolling material is guided and guided by the through guide 3' from the entrance side to the exit side of the mill, the above-mentioned problem does not occur at all. Therefore, in such a rolling method, rolling is performed only by appropriately adjusting the roll width of the split rolls 1' and the roll interval of the vertical rolls 2', which may require frequent replacement of the rolling rolls or place an excessive load on the rolling mill. It is possible to finish a shaped steel with a constant web height or a shaped steel with different types of web heights without applying any additional heat.

It should be noted that the above-mentioned penetration guide 3 is of course arranged so that the width edges of the flange of the profile are always in contact with each other, but its structure is such that a roller type guide is used to prevent the occurrence of surface scratches at the width edges. It is preferable that

FIGS. 5(a) and 5(b) show an example in which a groove U is provided in the reduction roll 2' of a universal mill, and a part of the through guide 3' is inserted into the groove U and fixedly held.

When using a penetrating guide having such a structure, the penetrating guide 3' is fixedly held via an extensible means S such as a spring, so that the penetrating guide 3' is divided when changing the amount of reduction adjustment of the web height. Even if it were to come into contact with the side surface of the roll 1', unnecessary force applied to the penetration guide can be advantageously avoided.

In the process of reducing the web height, in consideration of the widening of the flange, it is preferable to set the highest point P of the penetration guide slightly on the entry side of the roll center of the mill, as shown in FIG. Also, in order to keep the flange width end of the rolled material always in contact with the penetration guide, this can be achieved by changing the roll inclination angle of the vertical roll 2 or by changing the vertical setting position of the horizontal roll l. Penetration guides may be provided at both ends of the flange width, but in this case there is a risk of danger due to variations in flange width, so one of the upper and lower ends may be of a swing type as shown in Figure 7. It is necessary to devise ways to

(Example) On the line shown in Figure 3 above, H-4IIInm x 198 mm x 8.2 mm was subjected to rough universal rolling.
The rolled material to be XI4.8IIIn was rolled to H-40 using universal mills having the structure shown in Figures 1 and 2 under the following conditions.
0mm x 200nm x 8. Oms+X 14. O
An H-beam steel with a diameter of mm was manufactured.

As a result, it was confirmed that during the finish rolling process, the rolled material did not move up and down at all, and the web could be stably rolled with an offset of 2 cm or less relative to the flange width.

Rolling conditions (a) When using the universal mill shown in Figure 1A
=374.6 mm (integral roll) B =402.0
mm The penetration guide was designed to guide only the lower side of the rolled material.

(b) When the universal mill shown in Fig. 2 is used to perform finish rolling that also serves as web height reduction adjustment A" = 377.5 am (variable width roll) no-load setting B" = 402. The Otrm penetration guide was designed to guide only the lower side of the rolled material.

(Effects of the invention) - According to this invention, the material can be guided and guided consistently from the entrance side to the exit side of the mill, thereby avoiding dimensional deterioration due to positional deviation during rolling and achieving higher accuracy. Shaped steel can be obtained. Further, according to the present invention, it is possible to stably manufacture a section steel with a constant web height, similar to Buildup H,
In particular, for sizes with small differences in web height, rolling rolls can be shared, which eliminates roll chances, shortens delivery times by increasing roll chances, and reduces costs by reducing roll unit consumption and roll assembly work. can.

[Brief explanation of drawings]

Figure 1 (a), (b), Figure 2 (a), (b) are
FIG. 3 is a schematic diagram of a universal mill suitable for carrying out the present invention; FIG. 3 is a diagram showing the layout of the H-beam manufacturing equipment; FIG. 4 is an explanatory diagram of the deformation of the rolled material; FIG. (a)
, (b) is a schematic diagram of a universal mill suitable for carrying out the present invention, and FIGS. 6 and 7 are explanatory diagrams of how to attach the penetration guide. l...Horizontal roll 1'...Split roll 2.2
'... Vertical roll 3.3'... Penetration guide 4... Breakdown mill 5... Rough universal mill 6... Edger mill 7... Finishing universal mill Figure 1 Figure 2 Figure 5 (a) (b) Figure 6 Figure 7

Claims (1)

[Claims] 1. When manufacturing a section steel by rolling a rolled material having a web and a flange using a universal mill consisting of a combination of horizontal rolls and vertical rolls, from the input side to the output side of the universal mill. 1. A method for rolling a section steel, characterized in that a penetration guide is provided in contact with the flange width end of the material, and the rolling material is rolled under guidance by the penetration guide. 2. A universal mill equipped with a split roll whose roll width can change the width of a rolled material that holds the web of the rolled material between the upper and lower sides of the rolled material having a web and a flange, and a vertical roll that rolls down the web of the rolled material in the height direction along with the flange. In order to manufacture a section steel with a desired web height through the mill, from the input side to the output side of the universal mill,
A method for rolling a section steel, characterized in that a penetration guide is provided in contact with the width end of a flange of a rolled material, and rolling is performed to reduce the web height of the rolled material under the guidance of the penetration guide.