JPS58925B2 - Manufacturing equipment for H-shaped steel with lip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing lipped H-section steel.

A known method for manufacturing this type of H-section steel is to bend the end of a flange plate and then weld the flange plate and web plate together using high-frequency resistance. Since a lip is formed on the flange plate material, various considerations are required during welding, and it is difficult to manufacture a small size.

Therefore, there is a method of roll forming the lip after welding.

This consists of multiple stages of stands each having an inner roll and an outer roll that come into contact with the inner and outer surfaces of the flange, and these stands gradually bend the tip of the H-beam flange to form a lip. As shown in the figure, the inner roll 50 and the outer roll 51 are formed with inclined parts 50a and 51a having shapes corresponding to the inner and outer surfaces of the inclined lips.

The inclined portions 50a and 51a are shaped like 5 so as to abut the entire inner and outer surfaces of the lip.

However, when forming the lip using such a roll, the bending force by the outer roll 51 is concentrated at the tip of the lip, resulting in a large bending curvature, and in order to bend sharply (for example, the bending curvature is twice the flange thickness), roll reduction is required. Since the blade must be strong, the support strength and life of the inner roll 50 become a problem.

This invention has been proposed in view of the above-mentioned problems, and an object of the present invention is to provide an apparatus for manufacturing a lipped H-section steel that can withstand a relatively large rolling blade and can obtain a sharp bending curvature. With the goal.

The manufacturing apparatus according to the present invention includes three sets of inner rolls: a center inner roll located at the center of the stand at the outer roll rolling point, a front inner roll and a rear inner roll located before and after the center inner roll, and loads applied to the inner rolls. It was designed to share the following.

The present invention will be described below based on an illustrated embodiment.

As shown in Fig. 2, the H-beam H that has been welded or rolled is passed through the first stand 1, the second to fifth stands 5, and the final stand 6 in order to form the H-beam H with a predetermined lip.
1.

The second stand 1 is an introduction stand that also serves as a straightening machine.
It consists of a flat outer roll OR1 and an inner roll IR, and no lip forming is performed.

In the second stand 2 to the fifth stand 5, the tips of the flanges are sequentially inclined at angles of 20° and 40°, for example.

Bend at 60° and 80° to form a lip.

The outer rolls OR2 to OR5 of these stands 2 to 5 are composed of a cylindrical portion that contacts the outer surface of the flange and a lip suppressing portion corresponding to the above-mentioned inclination angle.

As shown in FIG. 4, the lip pressing portion 7 is not shaped to press the entire outer surface of the lip 8, but is shaped to press the vicinity of the root position r.

That is, the pressing surface of the lip pressing portion 1 extends from the root position r to a predetermined distance l, and this distance l is suitably about 2t to 4t (t is the flange plate thickness).

With such a pressing part 7, the forming load is concentrated near the root position r, and the curvature of the root becomes small.

Here, if the distance l is smaller than 2t, a large molding load is required, and if it is larger than 4t, the curvature of the root becomes a dog.

Further, the shape of the pressing surface of the lip pressing portion 7 may be formed of a curved surface with a certain curvature, as shown in FIG. 6, so that the pressing surface escapes outward.

The inner rolls of stands 2 to 5 are the inner rolls of stand 1.
The roller has the same shape as the roller with no slope and a contact surface with a lip up to the root position r.

As shown in FIG. 1, the inner rolls IR are arranged in a pair vertically, and the upper roll and the lower roll are supported in a cantilevered manner while abutting on their contact surfaces.

Furthermore, as shown in FIG. 8, the pair of upper and lower inner rolls is comprised of an inner roll IRc located at the center of the stand, that is, at the rolling point of the outer roll OR, an inner roll IRf located before and after this inner roll, and an inner roll IRf located before and after this inner roll. I
There are three sets of Rr, and the load applied to the upper and lower pair of inner rolls is shared and reduced.

Further, since this alone causes a large load on the central inner roll IRc, the diameters of the front and rear inner rolls IRf and IRr are made slightly larger than the diameter of the central inner roll IRc.

In this way, the effect of sharing among the three sets of inner rolls will be further increased, and the load will be applied more evenly.

For example, flange width 100mm, web height 100mm,
In the case of H-beam steel with a flange plate thickness of 3.2 mm, the diameter of the central inner roll IRc is 46.3 mm, and the diameter of the front and rear inner rolls IRf is 46.3 mm.
.

It is appropriate that the diameter of IRr be 46.8 mm.

Further, in this case, it is appropriate that the center distance between the three sets of inner rolls is about 50 mm.

Next, the support type of the inner roll IR will be described in detail.

As shown in FIGS. 9 and 10, a total of six inner rolls are attached to a support member 9 that is cantilevered to the stand frame.

The support member 9 includes a support plate portion 9B that is integrally formed with the base 9A with a gap that can accommodate the six inner rolls.
An inner roll is rotatably and removably supported in the gap by a pin 10.

That is, the head of the pin 100 is provided with a male screw 10a, which is screwed onto the support plate portion 9B, and which connects the inner roll and the pin 10.
Needle bearing 11 between, inner roll and support plate part 9B
A thrust needle bearing 12 is arranged between them.

Further, the tip of the pin 10 is half-notched in order to avoid the lip 8 which is bent while being fitted into the base 9A.

The final stand 6 is 40-ru, with upper and lower flat horizontal rolls 13, 13 and left and right flat vertical rolls 14.
, 14 to bend the lip 8 at right angles.

With such a diameter of 40 degrees, the bending accuracy is improved because the vertical rolls 14°14 directly roll down from the lateral direction.

In addition, although the apparatus for performing lip forming in five passes of stands 2 to 6 has been described above, the number of stands will be increased or decreased as appropriate depending on the flange plate thickness, flange width, web height, etc.

As mentioned above, the manufacturing apparatus according to the present invention has three sets of inner rolls: the center inner roll, the front inner roll, and the rear inner roll, so that the load applied to the inner rolls can be shared, and it can withstand a relatively large rolling blade. It is possible to manufacture lipped H-section steel with sharp bending curvature.

This is particularly effective when the inner roll cannot have sufficient strength when manufacturing small H-beams with lips.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a conventional manufacturing apparatus, FIG. 2 is a front view showing a manufacturing apparatus according to the present invention, FIGS. 3 to 5 are cross-sectional views of FIG. 2, and FIG. 1st stand, 4th stand
The figure shows the intermediate stand, Figure 5 shows the final stand, Figure 6 is a cross-sectional view showing a modified example of the roll shape, Figures 7 and 8 are cross-sectional views and side views showing the structure of the intermediate stand. figure,
9 and 10 are plan views showing the support structure of the inner roll,
FIG. 1...First stand, 2...Second stand, 3...
- Third stand, 4... Fourth stand, 5... Fifth stand, 6... Arithmetic stand, 7... Lip pressing portion, 8... Lip, 9... Support member, 9A...Base, 9B...Support plate part, 10...Pin, 10a...
・Male thread, 11... Needle bearing, 12...
Thrust needle bearing, 13...horizontal roll,
14...Vertical roll, IR. IRc, IRf, IRr...inner roll, OR, OR,
. OR2, OR3, OR4, OR5...outer roll, H.
...H section steel, Hl...H section steel with lip.

Claims (1)

[Claims] 1. A lip that is equipped with a plurality of stands each having an inner roll that contacts the inner surface of the flange and an outer roll that contacts the outer surface of the flange, and that these stands gradually bend the tip of the flange of the H-section steel to form a lip. This is a manufacturing device for attached H-section steel, in which the inner rolls are arranged in three sets: a central inner roll located at the center of the stand at the rolling point of the outer roll, and front stage inner rolls and rear stage inner rolls located before and after this central inner roll. A production device for H-shaped steel with a lip, which is characterized by: 2. The apparatus for manufacturing a lipped H-section steel according to claim 1, wherein the roll diameters of the front inner roll and the rear inner roll are slightly larger than the roll diameter of the central inner roll.