JPS60162502A - Rolling method of unequal leg angle of unequal thickness - Google Patents

Abstract

PURPOSE:To roll an unequal leg angle whose flange and web are different in thickness by rolling a slab by using a break-down mill, a roughing universal-mill, an edging mill, and a finishing universal-mill. CONSTITUTION:A steel slab is first rolled into a rough section 6 by a break- down mill. After revesingly rolling the section 6 through several or several tens of passages; the section 6 is rolled, while providing uniform elongations to its web and flange till it attains a final-pass cross section 9, by the upper and lower horizontal rolls 7 and 8 of a roughing universal-mill. The reforming rolling of an edge part 13 is successively performed by an edging mill of two-high mill type constituted of an upper roll 10 and a lower roll 11. Finally, a rolling reduction in the vertical direction is performed in combination with that in the axial direction by the upper and lower horizontal rolls 14 and 15 of a finishing universal-mill, to manufacture an unequal leg angle whose web and flange are different in thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing scalene angle steel angle shapes by rolling, and more specifically, the present invention relates to a method for manufacturing scalene angle steel angle shapes by rolling. ``Two horizontal rolls with holes with horizontal mills arranged as required.
A mill line consisting of a heavy roll rolling mill, an 8-roll rolling mill, a universal rolling mill, or a rolling mill row consisting of a combination of these mills is used to roll webs and rolls using the same rolls without the need for roll changes. The present invention relates to a method for rolling scalene angle shape steel having various flange thicknesses (including similar shapes such as scalene shape steel, equal thickness angle shape steel, equal thickness angle shape steel, and equal thickness angle shape steel).

Here, regarding the scalene thickness angle shape steel shown in FIG. The manufacturing method is a groove rolling method as shown in Fig. 1, and as shown in Fig. 2, first a rough universal mill 1 edge mill is used, then a finishing groove rolling method is used to completely manufacture the J:9 channel steel. There are two manufacturing methods: the Uni-no-Kuichisaru-groove rolling method, in which the web is cut in half and processed into scalene angle shape steel. In the former method of rolling using the grooves shown in Figure 1, each groove shown in Figure 2 (d
) As shown in Figure 8, the scalene angle shape steel is placed on the rolls of a double to eight-height rolling mill to roll the scalene angle shape steel 1. The sizes shown in Table 1 are manufactured by rolling, but in the shipbuilding industry, which is the main use of scalene angle shape steel, the aim is to design lighter hulls for companion ships with the aim of reducing labor and lugging ships. 0 No. 1 Scalene angle thick angle steel is used as a longitudinal material for longitudinal frames, longitudinal beams, horizontal stiffeners, etc. of ship hulls, but in order to design a lightweight ship hull, 1. It is necessary to adopt scalene angle steel angle shape steel sizes according to the bending moment. This design bending moment changes continuously depending on the part where the longitudinal material is used (for example, on the ship's side longitudinal frame, etc.). Section modulus 2 is continuous (610X
A product size system of scalene (equal thickness angle shape steel) is required with a section modulus of approximately 50 crn with a 15 mm plate.

However, as shown in Table 1, the product size of the current scalene thickness angle shape steel has a section modulus of 2 (610X
with 15 mm plate] is 150 to 500 between product sizes.
The large spacing between the two makes it impossible to design an economical hull to reduce the weight of the hull. When attempting to roll a unequal thickness angle section steel with a pitch of about 506n, which is required by . -8 pi, -0 product sizes are required, so the total number of product sizes is 4 to 5 times larger than in Table 1. In this case, it becomes necessary to change the rolls for each product size, which significantly increases the number of roll changes, greatly reducing the productivity of the rolling mill, and also significantly increases the number of required rolls, which increases manufacturing costs. In addition, in the case of the method of manufacturing from universally rolled channel copper shown in Figure 2, products of various thicknesses can be rolled by adjusting the openings of the horizontal and vertical image rolls in the rough universal mill and the etching mill. Although it is not impossible, finish rolling is not possible as shown in Fig. 2 (d
) As shown in Figure 2, the groove rolling method described above (
As in the case of FIG. 1), it is necessary to change the rolls for each product size, and the same problems as in the groove rolling method occur.

As a rolling method for scalene angle shape steel using groove rolling, a groove rolling method that does not require the cutting step shown in FIG. 2(e) is known from JP-A-50-62860. However, measures have been taken to prevent elastic deformation of the mill housing due to thrust loads caused by rolling asymmetrical cross-sections, but it is important to ensure that each rolling mill achieves the purpose of rolling the flanges and webs to their respective target thicknesses. However, in the production of scalene angle shape steel by continuous rolling, rolls of different sizes are required for each rolling mill and for each product size. The problem remains unresolved.

The present invention eliminates the drawbacks of such conventional methods and efficiently produces scalene angle steel with the thickness of the glaze using the same roll.
In addition, the present invention provides an original rolling method that enables economical production.

In order to achieve this objective, the present inventors have worked hard to develop a method for completely rolling scalene angle shape steel with various webs and flange thicknesses using the same roll without using the conventional groove rolling method. As a result of our research, we realized that we need a rolling mill that can optimally balance stretching for various different web and flange thicknesses during rolling. By providing a mating function that can apply axial pressure in addition to vertical pressure, we have demonstrated what is possible, and at the same time, we are further developing means to realize this new complex function. The rolling line was completed by stacking them, and this is where the present invention was made.In other words, the gist of the present invention is a double roll rolling mill equipped with horizontal rolls having grooves, and an 8-roll rolling mill. machine,
Or, when rolling scalene angle steel with uneven thickness by a mill line consisting of a universal rolling mill and a rolling mill row consisting of a combination thereof, the horizontal rolls are equipped with an axial rolling device in addition to the normal vertical rolling function. The scalene roll is characterized by having an axial rolling function by combining vertical rolling and axial rolling to perform rolling while optimally moving and adjusting the vertical and axial positions of the horizontal rolls. EMBODIMENT OF THE INVENTION The present invention will be described in detail below.

An example of the rolling equipment row (line) used to carry out the method of rolling a scalene angle steel angle shape according to the present invention is shown in FIG.
In the figure, 2 is a breakdown mill, 8 is a rough universal mill, 4 is an etching mill, and 5 is a finishing universal mill.Blooms, beam blanks, or slabs are used as rolling materials, and the breakdown mill 2 is used as shown in Figure 5. The material is rolled into a rough shaped material 6 having the shape shown in FIG.

This rough profile 6 is sent to the next rough universal mill for rolling by a universal mill, and will be described in detail below.

In general, scalene angle steel with uneven thickness is rated at 1 in terms of cross-sectional performance.
As shown in Fig. 8, the flange thickness t2) is thicker than the web thickness t0]. The rough profile after milling has the same ratio as the finished product, and the flange thickness is thicker than the web.D Figure 6 shows the flow from one pass of a scalene angle profile in a rough universal mill to the final bath. Although the rolling state is shown, in order to simplify the explanation, the position of the lower horizontal roll 8 is fixed, and the upper horizontal roll 7 is shown at the normal vertical rolling P.
In addition to 8U, axial reduction "AU" is possible. ◇In the same figure, the rough profile 6 is reverse rolled for several to 10 passes until it reaches the final helical cross section 9 in the rough universal mill.
A situation is shown in which the web and flange are rolled while being stretched evenly, but such rolling is possible because the upper horizontal roll J is in addition to the normal vertical reduction P8U (reduction amount SU). , axial reduction” AU function (reduction amount AU)
This is because it has

This axial reduction PAU is performed by an axial reduction device,
There are two ways to do this, such as installing a new dedicated horizontal roll axial rolling device and using a vertical roll rolling mechanism, but from the viewpoint of effective use and simplicity of the universal mill, the vertical roll rolling mechanism is considered to be effective. It is convenient to use the vertical roll 9 on the side receiving the thrust load of the horizontal roll 7 (designed thrust direction Rs). In this figure, a part of the side surface of the horizontal roll 7 is brought into contact with a part of the side surface of the vertical roll 9, and a normal rolling mechanism (not shown) of the vertical roll 9 is used to perform the axial rolling "AU". The horizontal roll 7 is moved in the axial direction and the axial reduction amount AU is adjusted between the 11th pass and the final pass.Of course, along with the axial reduction, the vertical reduction amount SUd by the vertical reduction device is also adjusted. From 1 bus top roll position Hu0 to final bus top roll position IfHuf
As shown in Fig. 6, when rolling a scalene angle bar with scalene thickness by the upper and lower horizontal rolls 7.8, a large axial thrust ( thrust load) is applied. Can it firmly support this thrust load and roll vertically and horizontally? , 8 so that they do not move in the axial direction R8 due to the rolling reaction force is important from the point of view of improving product dimensional accuracy. Should I try to do a horizontal roll? , 8 are restrained in the axial direction, thereby enabling rolling with higher precision. Of course, the horizontal roll position control (vertical and axial directions) in rolling, which may be fixed by the roll axial direction fixing device of the conventional rolling mill, takes into account the longitudinal and lateral rigidities of the universal mill. , it can be done by computer so that the target thickness can be obtained for the predicted rolling load and the predicted thrust load.

The above rolling method makes it possible to roll scalene angle shape steel having various thicknesses and thickness ratios between the web and the flange using the same roll (that is, without changing the rolls).

Next, rolling of the scalene angle shape steel in the edging mill 4 is carried out by the method shown in FIG. 7. This mill is a double rolling mill consisting of an upper roll 10 and a lower roll 11 The main purpose of rolling is to shape the edge portion 18 of the scalene angle iron end, and not the rolling of the web and flange. For this reason, partly because the capacity of the mill drive motor is small, a relief 12 is provided to prevent the upper and lower rolls 10 and 11 from being excessively reduced in order to prevent the web flange from being excessively reduced.
The surfaces corresponding to the web flanges of the upper and lower rolls, which are provided with the upper and lower rolls, only need to play the role of holding the rolled material necessary for the edge portion 18 to be sufficiently etched and the role of a pinch roll for conveying the rolled material. The roll relief 12 can have various shapes as long as this purpose is achieved.

One pass in this etching mill (upper roll position HE
, ) to the final pass (upper roll position HEf) is performed by a method almost similar to that of the rough universal mill shown in FIG. 6, i.e., as shown in FIG.
The lower roll 11 is fixed, and the upper roll 10 is provided with the functions of vertical rotation P8FJ (reduction amount SE) and axial reduction PAE (reduction amount A, ). This is done by a rolling down device. In addition, when the universal mill is used as an etching mill, it is also possible to use a vertical roll reduction mechanism as described above.
The thrust loads in an edging mill are 90% lower than in a rough universal mill and can be supported by an axial locking device.

In addition, for the purpose of shaping the edges of scalene angle steel angle shapes, the edging mill has a web width (long side) of 1 flange width (
If the product dimensions (short side) are changed, it is inevitable that the rolls will need to be rearranged. However, it is clear that this does not in any way reduce the effectiveness of the present invention.

Next, FIG. 8 shows the rolling of a scalene angle bar with uneven thickness using a finishing universal mill, but the principle is the same as that of rolling using a rough universal mill. Flange thickness changes and adjustments (ltf) and web thickness changes and adjustments (Δt
[Yu] performs the upper horizontal row by a combination of 14: vertical reduction and axial reduction. The thrust load support method of the horizontal rolls 14 and 15, the axial reduction method of the horizontal rolls, and the position control method are the same as those of the coarse universal mill. However, it goes without saying that it is also applicable to the rolling of similar shaped steel sections such as scalene equal thickness angle shape steel, equal width equal thickness angle shape steel, equal width equal thickness angle shape steel, etc. According to the rolling method of the present invention, the thickness of the web flange is various,
In addition, it is possible to efficiently and economically produce scalene angle shape steel of various product sizes with different thickness ratios and arbitrary pitches of section modulus 2 using the same roll, and the effect is as follows. Extremely noticeable 0

[Brief explanation of drawings]

Figures 1 and 2 are diagrams explaining the manufacturing process of scalene uneven thickness angle shape steel by the conventional method, and Figures 1 (a) to (g)
Figure 2 (a) to (e) show the case of the universal groove rolling method, and Figures 8 (a) and (b) show the case of the groove rolling method. Figure 4 shows an example of the rolling equipment row (line) used to carry out the rolling method of the present invention, and Figure 5 shows the rough shape after rolling by the breakdown mill of the line in Figure 4. Diagrams showing the shape of the material, FIGS. 6 to 8 are diagrams showing the rolling situation in each process of the line shown in FIG. 4,
FIG. 6 shows the case using a rough universal mill, FIG. 7 shows the case using an etching mill, and FIG. 8 shows the case using a finisher universal mill. l... Scalene side uneven thickness angle shape steel 2... Breakdown mill 8... Rough universal mill 4... Etching mill 5... Finishing universal mill 6... Rough shape material? , 10.14... Upper horizontal roll 8, 11. IJ...Lower horizontal roll 9...Vertical roll 16...Web 17...Flange. Patent applicant: Kawasaki Steel Corporation

Claims (1)

[Scope of Claims] 1. When rolling a scalene angle steel angle shape using a mill line equipped with a rolling mill equipped with horizontal rolls having a groove shape, the horizontal rolls have a normal vertical rolling function. A scalene roll that is provided with an axial rolling function using an axial rolling device, and is rolled while optimally moving and adjusting the vertical and axial positions of the horizontal roll by combining vertical rolling and axial rolling. Method for rolling unequal thickness angle shape steel 0 & rolling according to claim 1, wherein the axial rolling function of the horizontal roll is imparted by a rolling mechanism of a vertical roll that is in contact with a part of the side surface of the horizontal roll. 3. The method according to claim 1, wherein the axial load generated on the intermediate horizontal roll is supported by the vertical roll.