JP3132633B2 - Expanded metal and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expanded metal having a flat portion at least at a tip portion, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Ordinary expanded metal has a mesh formed entirely from the front end to the rear end in the material feeding direction at the time of cutting, and is manufactured as shown in FIGS. That is, in both figures, 1 is a material such as a steel plate, 2 is an upper blade,
Reference numeral 3 denotes a lower blade, which feeds the material 1 in the direction of arrow a by a mesh strand width W (see FIG. 5), and moves the upper blade 2 for each stroke by half the long dimension LW (also see FIG. 5). Shake to the left and right to form a mesh sequentially. The details of one mesh are as shown in FIG. 5. The portion indicated by 4 is called a strand, and the portion indicated by 5 is called a bond. The size of one mesh is represented by a short dimension SW, a long dimension LW, and a strand width (width of the strand portion 4) W. In addition,
Generally, the strand width W of expanded metal is the same for all meshes.

On the other hand, Japanese Patent Publication No. Sho 62-36106 proposes a method of manufacturing an expanded metal 7 having a flat plate portion 7a at the end and a mesh portion 7b in the middle as shown in FIG. The manufacturing method is a method of using a material in which a hole is made in advance at the boundary between the flat plate portion and the first mesh. The expanded metal 7 shown in JP-B-62-36106 is considered to have a constant strand width W for all the mesh portions 7b, similarly to a normal expanded metal.

[0004]

The above-mentioned manufacturing method for previously drilling a hole in a material requires an extra step of drilling a hole, and the position of the hole must be accurate. Messy and costly. In addition, a special material having a punched hole at a predetermined position is necessary, and it cannot be used arbitrarily during the cutting work. Further, it is practically difficult to use a coil as a material, and the material is almost limited to a cut plate.

When an expanded metal having a flat plate portion at the end as described above is manufactured, as shown in FIGS. 7 and 8, the flat plate portion 7a is simply cut off with the flat plate portion 7a left at the front end portion of the material 1. It is possible to start the operation. That is,
The upper blade 2 and the Setsunobe operation of forming the first round of dents 7c depress the portion indicated by S ₁ as shown in FIG. 9 (b) is a Setsunobe operation, in the second round of Setsunobe operation 9 the Setsunobe operation depressing the portion indicated by S ₂ as shown in (b) to form a mesh to form a first strand portion 7d. In the third round of Setsunobe operation was Setsunobe operation depressing the portion indicated by S ₃ as shown in FIG. 9 (c), to form a mesh to form the next strand portions 7e. Hereinafter, the same cutting operation as in the case of normal expanded metal is performed. However, in this method, the boundary portion during the second round of Setsunobe operation of FIG. 9 (b), the first bonding portion so that the first strand portions 7d is shown in FIG. 10 and (part of S ₂ above) In some cases, and could not be used in actual production. Although the cause of this break is not always clear, FIG.
In the first cutting operation (a), the recess 7 is formed in the flat plate portion 7a.
A very large load is required to form c, and this large load is close to the cut edge of the initial bond portion S ₂ (which is exactly the bond portion at this stage) (the portion indicated by hatching). 9), it is considered that the vicinity of the cut edge 6 is in a state where cracks are easily generated, such as a large residual tensile stress remains. It is estimated that when a tensile force is applied to the first strand portion 7d in the second cutting operation, a crack is easily generated and breaks. Incidentally, the flat plate portion 7a to the first bonding portion S ₂ is considered sufficiently influence of itself articulating.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is intended for producing an expanded metal having a flat plate portion at an end by directly cutting the raw material without performing extra processing such as drilling. An object of the present invention is to provide an expanded metal that can be manufactured so that a strand portion is not broken, and a method for manufacturing the expanded metal.

[0007]

An expanded metal according to the present invention for solving the above-mentioned problems has a flat portion at least at a tip portion and at least a width W ₁ of a first strand portion at a boundary between the mesh portion and the flat portion. Is wider than the width W of the normal strand portion of the mesh portion.

A second aspect of the present invention relates to a method of manufacturing an expanded metal for manufacturing the expanded metal of the first aspect,
The first cutting operation is performed with the flat portion left at the tip of the material, and at least the second cutting operation is performed at the same time.
And performing sending material so that the normal strand width W wider than the strand width W ₁ of the mesh portion of the expanded metal.

[0009]

When manufacturing the expanded metal having the above-described structure, in the first cutting operation (see FIG. 1A), a recess 7c is formed near the boundary between the flat plate portion 7a and the future mesh portion.
Occurs, the first bond portion (S ₂ parts: However, accurate to portion to be the bonding portion at this stage) appears.
Then, the feed material only W _1, the first bonding portion S ₂
When the second cutting operation (see FIG. 1 (b)) is performed in the form of pressing, the first strand portion 7d is formed. Since the width W1 of the _first strand portion 7d is wide, the strand portion 7d is not broken and has a predetermined dimension (1/2 of the short dimension SW).
Will be prolonged. Although the reason that the strand width is less likely to break and wide not necessarily clear, the wide strand portions 7d of this width, in particular in the boundary portion between the bond portions S _2, load when the Setsunobe operation of the first time The cross-sectional area of the part that has not received much adverse influence (for example, the part with no or small residual stress) is wide, and the part that is strongly affected by bad influence (hatched part indicated by reference numeral 6; ), The cross-sectional area is relatively narrow, so if a tensile load is applied to the strand portion 7d during the second cutting operation, the strand portion may be stretched without breaking. It is estimated to be. Further, as a cause of the breaking, the flat plate portion 7 to the first bonding portion S ₂
According to the present invention, even if it is considered that the influence of the concatenation of a is large, the influence of the first strand part 7d is reduced by widening the first strand part 7d.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic plan view showing an expanded metal 7A according to one embodiment of the present invention. As shown in the figure, the expanded metal 7A has a flat plate portion 7a at each of the front end and the rear end in the material feeding direction (arrow direction) at the time of cutting. The middle portion is a mesh portion 7b, and the mesh portion 7
first strand portion 7 at the boundary between b and the flat plate portion 7a
typical strand portions 7e of the width W ₁ of d mesh portion 7b
Is wider than the width W. In this embodiment, since it is preferably symmetrical as a product, the width W ₁ of the last strand portions 7f also widely like the tip side.

A manufacturing method for manufacturing the expanded metal 7A will be described. The cutting operation other than the feed amount of the material 1 is the same as that described with reference to FIGS. That is, the cutting operation is started in a state where the flat plate portion 7a is left at the tip of the material 1. The upper blade 2 in Setsunobe operation of the first to the Setsunobe operation depressing the portion indicated by S ₁ as shown in FIG. 1 (b). In the first cutting operation, a recess 7c is formed in the flat plate portion 7a in the vicinity of a connection portion with a future mesh portion, and the first bond portion S ₂ (however, at this stage, it is a portion which will be a bond portion exactly at this stage) ) Appears. Then, as shown in FIG. 1 (b), of the first bonding portion S ₂
Performs the second round of Setsunobe operation in the form of pressing a, where, when Setsunobe send material 1 only larger dimension W ₁ than the normal strand width W, the first strand portions 7d are formed wider . Since the width W1 of the _first strand portion 7d is wide, the strand portion 7d is stretched to a predetermined size (1/2 of the short dimension SW) without breaking. Although the reason why it is difficult to break when the strand width is wide is not always clear, the flat portion 7a is not used during the first cutting operation shown in FIG.
Require very large load to form a recess 7c in, and since the large load is concentrated on the first cut edge near the bonding portion S ₂ (partial indicated by hatching) 6, the cut edge near 6 It is conceivable that cracks are likely to occur, for example, large residual tensile stress remains. However, the wider the strand width W ₁ strand portions 7d as in the present invention, particularly in the boundary portion between the bond portions S _2, are less adversely affected by the load during the first round of Setsunobe operation portion ( For example, the cross-sectional area of a portion having no or small residual stress is large, and the cross-sectional area of a portion that is strongly affected (a hatched portion indicated by reference numeral 6; for example, a portion where cracks easily occur such as a large residual stress) is large. Because it is relatively narrow,
It is estimated that when a tensile load is applied to the strand portion 7d at the time of the second cutting operation, the strand portion may be elongated without breaking. Further, as a cause of breakage, even when it may be greatly affected by itself flat portion 7a in the first bond portion S ₂ is connected, according to the present invention, the width of the first strand portions 7d is wide It is thought that the effect is reduced.

In the third cutting operation, as shown in FIG. 1C, the material 1 is moved by the strand width W of the normal mesh portion.
The a Setsunobe operation depressing the portion (second bonding portion) indicated by S ₃ after sending. In the third cutting operation, since there is not much difference from the cutting condition in the normal mesh portion, there is little possibility that the strand portion 7e having the normal strand width W is broken. Hereinafter, the cutting operation is performed while feeding the material 1 by the normal strand width W to form a mesh. In this embodiment, even when the Setsunobe operation of the last mesh, the feeding amount of the material 1 as a normal feeding amount W large feeding amount W ₁ from the last of the mesh portion of the strand portions 7f wide strand width W It is assumed to be ₁ .
Note that the last mesh portion may simply end the cutting operation while leaving the flat plate portion 7a at the rear end.

The extent to which the initial strand width W ₁ is increased depends on the size, thickness, material, etc. of the mesh. For example, the material is a hot-rolled steel strip (SPH).
C), short dimension SW = 34 mm, long dimension LW = 13
5.4 mm, a strand width W = 7, if the size of thickness = 4.5 mm, the first strand width W ₁ of about 14 mm (i.e. about 2-fold) are appropriate. However, the present invention is not limited to this, and it is preferable to experimentally determine and set the width at which the first strand portion 7d does not break or crack.

The strand width at the rear end side is arbitrary, since there is no problem of breaking or cracking at the rear end of the material. Further, when a flat plate portion 7a is present at the end of the expanded metal 7, the flat plate portion 7a protrudes from the plane of the entire expanded metal (bounces up,
Alternatively, the plate may be flattened through a leveler, or the flat portion 7a may be bent near the boundary with the mesh portion 7b, if necessary.

In the present invention, the first strand width W ₁
Only the first strand portion 7d may be widened, but not only the first strand portion 7d but also a portion of the strand portion near the flat plate portion 7a, for example, up to the second strand portion or the third strand portion. This does not exclude making the width wider than the width W.

[0016]

According to the present invention, when an expanded metal having a flat plate portion at the end is manufactured, it is possible to manufacture the mesh so that the strand portion of the mesh is not broken. In addition, there is no need for extra steps such as drilling holes, and ordinary plain plate material can be used for the production, so that the production is simple and the production cost is low. Use is also possible.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a step of manufacturing an expanded metal according to one embodiment of the present invention. FIG. 1 (a) is a plan view showing a state where a first cutting operation is completed, and FIG. ) Is the second
Plan view of a state in which round th Setsunobe operation is completed, FIG. (C) is a plan view of a state where the third Setsunobe operation is completed.

FIG. 2 is a schematic plan view showing one embodiment of the expanded metal of the present invention.

FIG. 3 is a perspective view illustrating a procedure for manufacturing a normal expanded metal.

FIG. 4 is an enlarged sectional view taken along line AA in FIG. 3;

FIG. 5 is an enlarged view showing details of a general expanded metal mesh.

FIG. 6 is a plan view showing a conventional example of an expanded metal having a flat plate portion at an end.

FIG. 7 is a perspective view for explaining a situation in which a cutting operation is started simply with a flat plate portion left in order to manufacture an expanded metal having a flat plate portion at an end.

FIG. 8 is an enlarged sectional view taken along line BB in FIG.

FIG. 9 is a view for explaining a step of manufacturing an expanded metal having a flat plate portion at the tip end in the manner of FIGS. 7 and 8, and FIG. 9A shows a state in which the first cutting operation is completed. FIG. 3B is a plan view showing a state where the second cutting operation is completed, and FIG. 3C is a plan view showing a state where the third cutting operation is completed.

FIG. 10 is a diagram illustrating a problem of a conventional manufacturing method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Material 2 Upper blade 3 Lower blade 7A Expanded metal 7a Flat plate part 7b Mesh part 7c Depression 7d First strand part 7e Normal mesh part strand S ₂ First bond part W Normal mesh part strand width W ₁ First part Strand width

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-115268 (JP, A) JP-A-60-238043 (JP, A) JP-A-50-140359 (JP, A) JP-A-2- 249563 (JP, A) JP-A-55-5113 (JP, A) JP-A-57-99041 (JP, U) JP-A-57-123434 (JP, U) (58) Fields investigated (Int. ⁷ , DB name) B21D 31/04 E04C 2/08 E04F 13/04

Claims (2)

(57) [Claims] 1. A which has a flat portion on at least the tip portion, that it has wider than the width W of the conventional strand portions of the width W ₁ of the first strand portions mesh portion at the boundary between at least the mesh part said plate Expanded metal features. 2. A method of manufacturing an expanded metal according to claim 1, wherein a first cutting operation is performed while a flat plate portion is left at an end of the material, and at least a second cutting operation is performed. 's Setsunobe operation method of expanded metal and performing sending material so that the normal strand width W wider than the strand width W ₁ of the mesh portion of the expanded metal.