JPS5841641A - Manufacture of expanded metal type rolling material - Google Patents

Abstract

PURPOSE:To manufacture an expanded metal type rolling material having a good quality at a low cost, by rolling a steel plate by tandem rolling mill consisting of a rolling stand of a roll having a projecting part, and a flat roll, and a rolling stand by a flat roll. CONSTITUTION:A steel plate 6 is rolled by the first stand consisting of an upper roll 7 provided with a lot of projecting parts 9, and a lower roll 8 of a flat roll, and a rolling material 11 having a recessed part 10 formed by a projecting part 7, on the surface of the steel plate 6 is obtained. Subsequently, it is rolled by the second stand of upper and lower rolls 12, 12 consisting of a flat roll, is rolled to a rolling material 4 whose recessed part 10 has become a through-hole 10, and finally, is rolled by the third stand of upper and lower rolls 15, 15 consisting of a flat roll, and a rolling plate 17 of an expanded type product, having a through-hole 16 of an elliptical shape, which has expanded the diameter of a through-hole 13 is manufactured. Since there is no conventional cut-rolling process, a rejected product due to such a defect as insufficient notching, etc. is not generated, and an expanded metal type rolling material having an excellent quality can be manufactured with high yield.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for tandem rolling a steel plate to obtain an expanded metal-shaped rolled material at low cost and with good quality.

Extended metal sheets, which are widely used as building materials such as metal lath materials and steel plates for scaffolding, are usually produced by cold-cutting steel plates. After moving the cutter (2) up and down and drilling the steel plate (1) (with a large number of slits 7) (3) at appropriate intervals (and with an appropriate pinch), as shown in the perspective view of Fig. 2, this steel plate Apply tension (a> (1)) to the steel plate (1) from both ends in opposite directions, and expand the slit fa) to form a net shape (4).
form.

There is a problem in that the expander produced by the above-mentioned cold-rolling method is produced, and the cost is high because the cold-rolling process requires a lot of effort, making it difficult to obtain a low price.

The object of the present invention is to overcome the above-mentioned drawbacks and provide a method for manufacturing expanded metal products from steel plates at low cost (and without causing cuts or the like).

That is, in tandem rolling, the present invention performs indentation rolling to form a large number of recesses of a desired shape in the rolled material by rolling a roll provided with a large number of convex portions on a stand in the previous stage, and then performing flat-hole rolling on the subsequent stand. The gist of the present invention is a method for producing an expanded metal-shaped rolled material in which a concave portion (through hole) is formed in the rolled material and the through hole is enlarged by subsequent flat roll rolling of the stand.

According to the conventional cold cutting method, as mentioned above, the steel plate is pulled in opposite directions from both ends to widen the slits and form expanded metal into a net shape. Exceeding the allowable tensile strength limit may cause breakage and result in an unsuitable product. However, according to the method of the present invention, since the mesh of each expanded metal rolled material is formed based on the indentation rolling of the convex portions provided on the rolling roll, a uniform shape can be obtained (
Since no tensile concentrated stress is applied to the mesh, breakage of the strands is completely prevented.However, in the method of the present invention, the mesh is formed as the steel plate is rolled down during the tandem rolling process. The present invention (hereinafter referred to as the present invention) enables cost reduction because the separate process of cutting as in the conventional method can be omitted.
I'll explain it in more detail.

Figures 3(a) and 3(c) are vertical cross-sectional views showing an example of the cross-sectional shape of the rolled material for each pass of the tandem rolling method of the present invention; is the upper roll (7),
It is rolled by the lower roll (8) and then rolled by the upper roll (7).
) The upper surface of the rolled material (11) is shown in which the concave part (10) is formed by pushing in the convex part (9) provided in (
B) flat roll (warm)
10) shows the formation of the rolled material (14) with through holes (fields), and (c) shows the flat roll (15) (+5
) + Expand the diameter of the through hole (13) in (b) to make the through hole (1
6) and 7) are shown being formed. Figure 4 also shows the upper roll (
7) A perspective view showing an example of the shape of the convex portion (9) provided in G and the shape of the concave portion formed in the rolled material (11). ) formed in the through hole (13
), and FIG. 6 is a perspective view showing the shape of the through hole (16) of the rolled material (+7) shown in FIG. 3(C).

The method of the present invention will be explained in detail based on FIGS. 3(a), 4(b), and 6.

First, a cylindrical convex portion of a predetermined diameter and height is formed on the surface of, for example, the upper roll (7) of the upper and lower rolls 7++81 of the tandem rolling mill front stage stand (as shown in the perspective view of FIG. 4). (9) in the width direction of the roll (this is the specified interval (l)
), and similar convex portions (9) are arranged in multiple rows in the circumferential direction at a predetermined pitch (1) from the rows over the entire surface of the roll.

After that, the distance between the upper roll (7) and the lower roll (8) is set to a predetermined value, and the steel plate (6) is inserted into the upper and lower rolls (7) +81 in the direction of arrow C as shown in FIG. Sakuk
) is rolled into a rolled material (11), and this rolled material (1
1) On the upper surface of the upper roll (7), a recess (lO) with approximately the same dimensions (diameter, depth) as the projection (9) is created by pressing the projection (9) of the upper roll (7). spacing similar to the arrangement (11);
Formed with a pinch (1).

Note that the above protrusion (9) is installed on the lower roll (8) when the upper roll (
7) Make a flat roll and place four parts (1
0) may be provided.

Next, the rolled material (11) is passed through the flat roll (+21) of the stand next to the stand (see FIG. 3(b)).
When the material shown in FIG. The bottom of the hole is removed, and an elliptical through hole (13) is formed as shown in FIG.
) is formed. In addition, in the above rolling number, the rolled material (1
1) The concave part (10) & the hole for forming the through hole are
It is preferable that the elongation rate is 25% or more, and the steel plate (6)
The depth of the fourth part (10) to be formed is the same as the depth of the rolled material (
The depth is preferably 40% or more of the plate thickness in 11).

Next, the rolled material is further rolled on a stand in the latter stage (with rolls (+5) (+5+ makes the thickness 77f) and the through-hole (13) is further enlarged in diameter in the longitudinal direction to form a second roll. As shown in Figure 6, the major axis (p) and the minor axis (q
) An expanded metal-shaped rolled material having the desired dimensions of an ellipse and notches (r) is manufactured.

Next, examples of the present invention will be described.

The surface of the upper roll (7) of the first stage stand of the tandem rolling mill (as shown in the perspective view of Fig. 4, the cylindrical convex part (9) with a diameter of 5πm and a height of 1) is A large number of rolls were arranged on the entire surface of the roll at intervals of 6.5πm in the circumferential direction.

The upper roll of the first stage stand of 3.2mm thick steel plate (
7) A rolled material (11) was obtained in which a concave portion 1F1 was formed between the lower rolls (8) by rolling the material in two series to a thickness of 2.0 am.

Next, the flat roll (+2) (12+) on the second stand
The rolled sheet (11) was rolled down at an elongation rate of 30% to a plate thickness of 1.4 mm. The recess (10) has a major axis of 7.5a.
, it became a through hole (13) with a minor axis of 5πm.

Next, the rolled material is further rolled down in a later stage stand, and the long diameter of the through holes (13) is expanded to form a large number of through holes (13) with a long axis of 22 mm, a short axis of 5 πm, and an increment width of 4.4 am (as shown in FIG. 6). 16) An expanded metal-shaped rolled material having a net shape was manufactured.

According to the above-mentioned method of the present invention, the expanded band-shaped rolled material is formed with uniform perforations in regular increments, and when the mesh is formed, the mesh is cut in two, etc. There were no products with defects or defects in shape.

As explained above, the present invention involves rolling a steel plate to a predetermined thickness by tandem rolling, forming a net shape of a desired shape on the rolled material, and producing a methiex band metal-shaped rolled material. This eliminates the need for a separate process for cold-cutting steel sheets, which is required in the past.This simplifies the manufacturing process, reduces manufacturing costs, and allows for smooth cutting with no cuts or cuts. This method has many benefits, such as being able to mass-produce expanded material of high quality.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views schematically showing an example of manufacturing expanded metal by the conventional method, and Figures 3 (a), (b), and (c) show the method of the present invention, which uses tandem rolling. FIG. 4 is a vertical side view showing an example of the cross-sectional shape of the rolled material for each pass, and FIG. Fig. 6 is a perspective view showing through holes formed in the rolled material. 1.6: Steel plate, 2: Cutter, 3 Nislit. 4: Net, 5: Strand, 7: Upper roll. 8: Lower roll. , 9: Convex portion, 10: Concave portion. 11 , 14 , 17 ; Rolled material; 12 , 15 :
Instep roll. 13, 16: Through hole applicant Sumitomo Metals - E Industry Co., Ltd. 11゜Figure 1F2Figure 3Figure 3Figure 3

Claims (1)

[Claims] m In tandem rolling, a roll G provided with a large number of convex portions is used to perform push rolling to form a large number of recesses in a desired shape in the rolled material, and then flat roll rolling on the stand is performed to form four portions of the rolled material. A method for producing an expanded metal-shaped rolled material, which comprises forming a through hole and enlarging the through hole by subsequent flat roll rolling of a stand.