JPS6261702A - Method an apparatus for rolling round part of h-beam or the like - Google Patents

Abstract

PURPOSE:To form both upper and lower round parts of an H-beam, etc. as desired and to improve the strength and toughness of said parts by discretely rolling both round parts with round rolling rolls while the flange parts of the H-beam or the like are held restrained by vertical rolls. CONSTITUTION:This device has a pair of the vertical rolls 15 which contact with the outside surfaces of the flange parts 1 and rolling rolls 8... which roll down the upper and lower round parts 3 by contacting therewith. The rolls 8... are freely movable upward and downward and can be attached to and detached from each other. The outside surfaces of the flanges are restrained by the right and left vertical rolls 15 and the rolls 15 housed in chocks 16 maintain the flange parts at the prescribed web height as screw shafts 10e are rotated by motors 9e n the stage rolling down the round parts 3. The rolls 15 are rotationally driven by motors if to advance the H-beam A which is the rolling material. The round parts meeting the sectional size of the product are thus formed and the fracture transition temp. of the impact characteristic is improved.

Description

[Detailed Description of the Invention] <Object of the Invention> Industrial Field of Application The present invention relates to a method for rolling the rounded part of H-beam steel, etc., and an apparatus therefor, and more particularly, it relates to a method for rolling the rounded part of H-beam steel, etc., and an apparatus therefor. The present invention relates to a method and an apparatus for rolling a rounded portion of a joint between a web portion and a web portion as desired.

In addition, although the case in which H-shaped steel is rolled with a variable width horizontal roll whose roll width can be adjusted will be explained below, the present invention is applicable to a horizontal roll whose width does not change except when rolled with this type of horizontal roll. It can be applied to general steels other than H-shaped steels, such as those that have rounded portions or fillet portions.

Conventional technology Universal rolling mills are generally used when rolling H-section steel, etc., but with the aim of improving dimensional accuracy, reducing roll consumption, and improving production efficiency, we have developed a final universal rolling mill. Horizontal roll with adjustable roll width, i.e.
Variable width horizontal rolls have been used.

By using this variable width horizontal roll, any roll width can be set online without having to rearrange the horizontal rolls, and H-beams etc. with different inner web widths can be manufactured. When this width-variable horizontal roll is used, for example, H
Shape wA (web height H, web inner width W, flange width 8,
Although it is possible to manufacture an H-section steel having an arbitrary web height (■) and a 7-lunge width (B) with a web thickness tl and a flange thickness h), since the same horizontal rolls are used, the web part 2 and flange part 1 are The radiused portion 3 of the joint has a constant dimension. However, the dimensions of this rounded portion 3 are the cross-sectional dimensions of the product (
(shown as the product of web height H x flange width B) needs to be increased, and if it is not increased, the strength and toughness of the rounded portion 3 will be lower than that of the web portion and the flange portion, which is undesirable. Therefore, even if the same width-variable horizontal roll is used, the rounded portion 3
It is necessary to mold the dimensions of the

That is, the variable width horizontal roll shown in Japanese Patent Application Laid-open No. 82209/1999 consists of a pair of sleeve rolls, and is configured so that the distance between the sleeve rolls can be adjusted by fluid pressure or the like.

Although the roll width of this horizontal roll can be adjusted according to the desired web height H and flange width B, the radiused portion 3 cannot be adjusted according to the cross-sectional dimensions of the product.

Problems to be Solved by the Invention The purpose of the present invention is to solve the problem that the conventional variable width horizontal roll cannot adjust the rounded part of the joint between the web part and the flange part by rolling down according to the cross-sectional dimensions of the product. shall be.

<Structure of the Invention> Means for solving the problem and its operation, that is, the method of the present invention is to fix the web part of the H-section steel, etc. from the outer surface of the flange part with vertical rolls. It is characterized in that both the upper and lower rounded portions of the joint with the flange portion are rolled with rounded portion rolling rolls.

In addition, the equipment for carrying out this method includes a pair of vertical rolls that come into contact with the outer surface of H-shaped steel, etc., and a rounded part of both the upper and lower joints between the web part and flange part of Z(r)N-shaped steel, etc. comprising upper and lower round roll rolls that abut and roll down, and configured such that the upper round rolls are movable up and down and move toward or away from each other;
It is characterized in that the rolling rolls in the lower radius portion can be moved up and down and moved toward or away from each other.

The structure and operation of these means will now be explained in more detail with reference to the drawings.

In addition, FIG. 1 is a front view showing in cross section a part of an example of a rounded part rolling down device for implementing the method of the present invention, and FIG. 2 is an explanatory view of a rounded part rolled down state by the method of the present invention,
FIG. 3 is a perspective view of an example of a rounded rolling roll.

First, in Fig. 1, the symbol A indicates H-section steel, and this
The rounded portion 3 of the shaped steel A is rolled by each rounded portion rolling roll 8 and formed into a predetermined radius dimension. Each of these rounded rolling rolls 8 is configured to be able to move by a desired amount in the vertical and lateral directions, for example, by driving a motor or the like, as described below.

That is, the lateral movement mechanism includes the screw shafts TOa and 10b having opposite left and right threads, and each screw shaft 10a.
, 10b, and motors 9a and 9b,
When the screw shafts 10a, 10b are rotated by the motors 9a, 9b, the rounded rolling rolls 8 slide in the lateral direction, and in particular, the screw shafts 10a, 10b are formed with reverse threads on the left and right with the center as a boundary. As a result, the left and right rounded rolling rolls 8 slide toward or away from each other.

Each vertical movement amount is obtained from the position detection devices 11a and 11b, and the roll width (
l: the outer dimension of the left and right radius rolling rolls 8) can be set, and this roll width (Ii) is made to match the hot value W of the inner width of the product web (see FIG. 4).

In addition, in order to move the upper and lower radius rolling rolls 8.8 up and down, a beam 13a513b, screw shafts 10c and 10d, and a motor 9C (however,
The lower motor is not shown). Therefore, each beam 13a, 13b moves up and down along the housing 14,
The screw shafts 10c and 10d are moved up and down by rotating both motors 9C. Moreover, if the upper and lower beams 13a and 13b are individually operated by motors, the pass line and the upper and lower rounded rolling roll gaps can be changed individually.

The amount of elevation at this time is obtained from each position detection device 11C (however, the lower one is not shown), and similarly to the lateral movement mechanism described above, it is set to an arbitrary value by the control device, and the vertical The roll gap between rolling rolls 8.8 is
Match the hot value of the product web thickness [see Figure 1 and Figure 2].

Next, when rolling down the rounded portion as described above, the outer surface of the flange is restrained by the left and right vertical rolls 15 (however, the right vertical roll is not shown). Each vertical roll 15
is stored in the chock 16, and the screw shaft 10e
is rotated by the motor 9e, the chock 1G is activated, and set to an arbitrary value, and the pair of vertical rolls 15 maintains the web at a predetermined height. Further, each vertical roll 15 is rotationally driven by nine motors, and this rotation advances the H-shaped steel A as a rolled material. When rolled by the vertical rolls 15 and the rounded portion rolling down rolls 8 in this manner, the rounded portion is rolled down in the same plane in the longitudinal direction while being constrained by the outer surface of the flange.

Note that the upper beam 13 and the chock 16 are preferably brought into close contact with the screw shaft 10C110e, and for this purpose, a balancing force can be applied by a separate device (not shown).

Further, the dimensions of the radius portion vary depending on the product size, and it is necessary to select a roll 8 with an appropriate radius dimension. From this point of view, as shown in FIG. 3, it is also possible to arrange several types of round rolls with different radius dimensions around the outer ring 17 and select the round roll roll 8 with the radius dimension according to the product size. It is. outer ring 17
is configured to be rotatable by contacting the inner ring 17a via a ball bearing, and moves any rounded roll to a predetermined location. Also, during rolling, the outer ring 1
7 rotates, the inner ring 17a is rotated by the stopper 19.
Fixed to.

Example Next, examples will be explained.

First, as shown in Fig. 2, H-section steel A is
The rounded part 3 of was rolled down. At this time, the radius dimension R' of the horizontal roll of the final universal rolling mill using variable width horizontal rolls was set larger than the radius dimension R of the product, and only the curved portion 3 was rolled down and formed. The radius dimension of each of the upper and lower radius rolling rolls 8 was made to match the product radius dimension R.

When rolling down only the rounded part, the unrolled part is highly constrained, so the H-shaped steel of the rolled material does not extend in the longitudinal direction.
Web height and flange width increased.

The metal 20 whose area is reduced in the rounded part 3 flows to the web part and flange part, and the web height and flange width increase It(ΔH
1ΔB) was determined using the following equations (1) and (2).

π △H=4α・(1−−)・(R” −R2Vt*−・−
...(1) π ΔB=2(1-α)・(1−−−1・(R' ” −8
2)/lr...(2) (where tv: web thickness, tf: flange thickness, α: metal flow rate to the web of radius area reduction amount) Therefore, the final universal rolling mill The exit side dimension was the value obtained by subtracting the above increase amount.

Table 1 shows the mechanical properties of a 5S41 rounded section of H-section steel rolled by the method of the present invention, size 300x300x10x15. From Table 1, it can be seen that the fracture surface transition temperature of the impact properties ' has been significantly improved.

Similar results were obtained when the rounded portion of the channel steel was rolled down using a variable width horizontal roll in the same manner as in Table 1.

<Effects of the Invention> As explained in detail above, the method of the present invention is to individually roll the rounded portion of the H-beam steel, etc. after rolling with the horizontal O-roll of the final universal rolling mill while restraining the outer surface of the H-shaped steel. Since it is rolled by rolling, the radiused portion can be formed as desired, and the strength and toughness of the radiused portion can be greatly increased.

In addition, even if H-beams etc. with various roll widths are rolled using variable width horizontal rolls in the final universal rolling mill,
It can be formed into a radius that corresponds to the cross section of the product, greatly expanding the range of applications for variable width horizontal rolls.

[Brief explanation of drawings]

Fig. 1 is a front view of the radius rolling device used in carrying out the method of the present invention, Fig. 2 is an explanatory diagram of an example of rolling the radius by the method of the present invention, and Fig. 3 is a rolling roll for the radius part. FIG. 4 is a perspective view of an example, and FIG. 4 is a sectional view of an example of H-section steel. Code A...H-shaped steel 1...Flange part 2...Web part 3...
Round part 8...Round part rolling rolls 9a, 9b, 9c, 9e, 9f---Motor 10a, 10b, 10c, 10d, 10e---
・Screw shafts 11a, 11b, 10...
Position detection devices 13a, 13b...Beam 14...Housing 15...Vertical roll 1G...Chock 17.17a.
...Ring 18...Ball bearing 19...Stock flange

Claims (1)

[Scope of Claims] 1) While restraining the flange portion of the H-section steel etc. from the outer surface with vertical rolls, both the upper and lower rounded portions of the joint between the web portion and the flange portion of the H-section steel etc. are rounded. A method for rolling a rounded section of H-beam steel, etc., characterized by rolling with a section rolling roll. 2) A pair of vertical rolls that come into contact with the outer surface of the H-beam, etc., and the upper and lower rounded portions that come into contact with and roll down the rounded portions of both the upper and lower joints of the web and flange of the H-beam, etc. The rolling rolls in the upper radius are configured to be able to move up and down and move toward or away from each other, and the rolling rolls in the lower radius are configured to be able to move up and down and move toward or away from each other. A round section rolling device for H-beam steel, etc., characterized by the following.