JPH105914A - Production of net body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently braze each other crossed parts only of slender bar bodies of a net assembled so as to cross slender bar bodies. SOLUTION: A binder solution 11 is sprayed to assembled slender bodies 3 and a solution pool part 12a is formed at its crossed part, by drying/ evaporating the binder solution 11 at other parts and leaving the solution pool part 12 at the crossed part, subsequently, by spraying a brazing filler metal powder on the solution pool part so as to be absorbed/caught to the solution pool part, the brazing filler metal powder is held in the gap at the crossed part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a net-like body in which elongated strips such as wires, strips, bars, pipes, and shapes are combined so as to intersect each other. More particularly, the present invention relates to a method for efficiently producing a braided braid at the intersection of elongated strips.

[0002]

2. Description of the Related Art Hitherto, nets such as wire nets and lattices, that is, structures in which elongated strips such as wires, bars, pipes, and shapes are crossed and combined with each other have been used for various purposes. As such a net-like body, there is one in which elongated strips combined like a wire mesh are held together at their intersections by their elastic force to maintain a predetermined shape. . Also, like a grid,
There is also a structure in which the intersections of the elongated strips are welded to each other by spot welding, resistance welding, or the like, independently of maintaining the fitting by the elastic force of these elongated strips.

[0003] By the way, the conventional mesh body as described above,
There was a problem that the mutual connection of the elongated strips was weak and the strength as a whole was small. That is, like a wire mesh,
In the case where wires are combined so as to be fitted with each other by their elastic force, the bonding between these wires is weak, and misalignment of these wires is likely to occur. Further, even when the bars are welded at their intersections, such as a lattice, the intersections of these bars are in principle point contact, so the welding area at these intersections is small and sufficient. The strength cannot be obtained.

[0004] For this reason, in a net used for a special purpose requiring a large strength, it is preferable to braze the intersections of the elongated strips such as wires with each other. Since this brazing does not melt the elongated strip as a base material, the strength of the brazing portion at the intersection does not decrease. Further, since this brazing material is filled in the gaps at the intersections, a large joining area is obtained and the strength is high.

[0005] Further, for example, there is a type using a fine mesh wire mesh as a carrier of a catalyst for purifying exhaust gas or a heat storage body of a Stirling engine. In this case, by brazing the intersecting portion of the wire material of the wire mesh as described above, the strength is increased, the gap at the intersecting portion is filled with the brazing material, and the surface shape of the brazing material is smooth. As a result, the rectifying action at the intersection can be performed, and the gas flow resistance can be reduced. Further, by brazing the intersections in this manner, heat transfer between the wires at the intersections is increased, and there is an effect that the temperatures of the wires become uniform.

[0006] However, in the above-mentioned reticulated body, brazing all the intersections of the elongated strips requires a great deal of labor, and the production thereof is extremely inefficient. In order to efficiently braze the intersecting portion of such a mesh, there is a so-called dob dipping method in which the entire mesh is dipped in a molten brazing material. However, in such a method, not only the intersection but also the entire elongated strip constituting the net-like body is covered with the brazing material, so that the brazing material is wasted and the appearance is deteriorated. Also,
In the case of a fine mesh network, there is also a problem that the brazing material is filled in the eyes, causing so-called crushing.

[0007]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above-mentioned circumstances, and the intersections of the elongated strips of the net-like body are mainly brazed with a brazing material so that waste of the brazing material and appearance of the brazing material are reduced. It is an object of the present invention to provide a method for producing a mesh body capable of preventing the lowering and efficiently performing such brazing.

[0008]

According to the present invention, a plurality of elongated strips are combined with each other so as to intersect with each other, and a binder liquid having wettability to the surfaces of the elongated strips is provided. Adhere to the surface of these elongated strips,
A step of forming a liquid pool portion of the binder liquid by the surface tension in the gap between the intersections of these elongated strips, and most of the binder liquid attached to the elongated strips is evaporated,
A step of evaporating and drying the binder liquid adhering to the other parts, leaving the binder liquid in the above-mentioned liquid pool part held at the intersection of these elongated strips, and The brazing material powder is sprayed on the liquid pool portion of the binder liquid, and the powder of the brazing material is adsorbed and mixed with the binder liquid in the liquid pool portion, and the brazing material paste obtained by mixing the brazing material and the binder liquid at the intersection of these elongated strips. And a step of heating the elongated strips and brazing the intersections of the elongated strips to each other.

Therefore, the powder of the brazing material sprayed is
It hardly adheres to the part other than the liquid pool remaining at the intersection, and is adsorbed and mixed with the binder liquid remaining at this intersection, and a large amount of brazing material paste adheres only to this intersection. Therefore, this intersection can be brazed in a focused manner. Therefore, the brazing material is not wasted, the appearance is improved, and no trouble such as crushing by the brazing material occurs. Furthermore, in this method, the binder liquid is sprayed on the entire reticulated body, or the whole is immersed in the binder liquid, and then the drying time is appropriately set. Most of the binder liquid adhering to the substrate can be dried, and a liquid pool portion of the binder liquid can be left at the intersection, so that the process is simple and extremely efficient.

According to a second aspect of the present invention, there is provided a step of applying a brazing material paste obtained by mixing a brazing material powder and a binder liquid to at least a part of the surface of the elongated strip; Arranging the strips so as to cross each other, and moving the crossed strips relatively so that the crossing portions slide, and displacing the brazing material paste on the surface by the relative sliding. And a step of heating these elongated strips and brazing the intersections of these elongated strips to each other.

Therefore, by the above relative sliding,
Brazing only the intersection because the brazing material paste on the surface of the elongated strip is scraped off and accumulated in the gaps at the intersections, and the brazing paste at the other parts is removed. The brazing material is not wasted, the appearance is improved, and the brazing material is not crushed. In addition, this method is simple and extremely efficient because the brazing material is only applied to a part of the elongated strip and then the elongated strip is combined and moved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 6 show a first embodiment of the present invention. This is a method of manufacturing a net-like body in which wires as elongated strips are combined in a plain weave shape, and only the intersections of these wires are brazed. In addition, this method may use a strip, a bar, a tube, a mold, or another elongated strip as the elongated strip, or a combination of these strips is not limited to a plain woven shape, and the same applies to other combinations. Can be implemented.

FIG. 1 shows the structure of the mesh body 1 to be manufactured. In the drawing, reference numeral 2 denotes a frame, in which a plurality of wires 3 and 4 as elongated strips are arranged so as to be orthogonal to each other. These wires 3 and 4 cross each other at right angles,
In addition, they are arranged in a so-called plain weave shape in which the crossing state is alternately reversed. The ends of these wires 3 and 4 are superimposed on the front surface or the back surface of the frame material, or inserted into holes formed in the frame material 2. In this embodiment, in the above-mentioned wires 3, 4, the fitting of each intersection is maintained by the elastic force in the combined state.

As shown in FIG. 2, these wires 3 and 4 are brazed to each other at their intersections by a brazing material 5. Since the cross-sectional shapes of these wires 3 and 4 are circular and intersect at right angles, the wires 3 and 4 are in point contact with each other at these intersections. However, in the gap between the surfaces of the wires 3 and 4 at the intersection, the molten brazing material at the time of brazing is held by surface tension, and the brazing material 5 is formed on the surface of the wires 3 and 4 at the intersection. Joined over a relatively wide range of
It has sufficient strength. Further, the brazing material 5 fills the gap at the intersection and smoothes the outer shape of the intersection. The ends of these wires 3 and 4 and the above-mentioned frame 2 are joined by brazing similar to the above or other joining.

Next, an embodiment of a method for manufacturing the above-described reticulated body 1 will be described. First, a net is formed by combining the above wires 3 and 4. In this case, the above frame 2
May be attached from the beginning or later.

Next, as shown in FIG.
The binder liquid 11 is applied to the entire surface of the substrate. The binder liquid 11 is based on, for example, water, to which a component for adjusting the wettability and surface tension of the wire, the evaporation rate, the viscosity, etc., or a component for brazing is added. Preferably, the components of the binder liquid 11 completely evaporate and do not leave a film or the like on the surface of the wire after drying. Further, the application of the binder liquid 11 is performed by, for example, spraying the binder liquid on the entire reticulated body or immersing the reticulated body in the binder liquid.

The binder liquid 11 adhered to the surfaces of the wires 3 and 4 as described above adheres to the surfaces of the wires 3 and 4 in the form of a thin film. Inside, a certain amount is held by the surface tension, and a liquid pool portion 12a is formed. Note that the amount of the binder liquid in the liquid pool portion 12a held at the intersection can be adjusted and controlled by the composition of the binder liquid 11 and the like as described above.

Next, the binder liquid adhering to the surfaces of the wires 3 and 4 is evaporated by natural drying, heating drying, vacuum drying or the like. In this case, the wires 3, 4
The binder liquid 11 in the form of a thin film on the surface is evaporated and dried in a short time, but only a part of the binder liquid in the liquid pool portion 12a evaporates. Therefore, even after the binder liquid 11 in the form of a thin film is almost, that is, substantially evaporated and dried, the liquid pool portion 12b of the binder liquid remains as shown in FIG.

Then, the drying is stopped in this state, and the brazing material powder is sprayed on the entire net. The sprayed brazing powder does not substantially adhere to the dried portions of the surfaces of the wires 3 and 4. On the other hand, the brazing material powder is adsorbed and captured on the liquid surface of the liquid pool portion 12b at the intersection, and is suspended in the binder liquid of the liquid pool portion 12b to form a brazing material paste 12c. Material paste 1
2c is held in the liquid pool portion 12b, that is, in the gap at the intersection. The method of attaching the powder of the brazing material is not limited to the application of the powder of the brazing material as described above. For example, the mesh may be taken out after being buried in the powder of the brazing material. Any method may be used as long as the powder of the brazing material comes into contact with the liquid pool portion.

Next, if necessary, the brazing material paste 1
After drying 2c, the entire reticulated body is carried into a heating furnace, and the wires 3 and 4 are heated to melt the brazing material.
As shown in FIG. 7, the intersections of these wires 3 and 4 are joined by a brazing material 5.

The wires 3 and 4 and the frame 2
When brazing is performed by brazing, the ends of these wires 4 and 5 may be overlapped and held on the frame 2 before performing the above-described process, or may be inserted into gaps and holes formed in the frame 2. By inserting the ends of the wires 3 and 4 and performing the above-described steps, the brazing of the intersections of the wires 3 and 4 and the brazing of the wires 3 and 5 and the frame 2 are performed simultaneously. Can be attached.

According to such a method, only necessary portions of the intersections of the wires 3 and 4 can be brazed, and other unnecessary portions are not covered with the brazing material. Therefore, this brazing material is not wasted and the appearance is improved. Further, since these wires 3 and 4 are brazed to each other at the intersections, they are structurally strong, and the gaps at the intersections are filled with the brazing material, and the outer shape of the brazing material is Since the shape is such that the portions are smoothly connected, the resistance of the fluid passing through the mesh body is reduced, and the appearance is improved. In addition, this wire 3, 4
Since the intersections are joined by the brazing material 5, the heat transfer of this part becomes large, and when this mesh is used as a thermal element such as a catalyst carrier or a heat storage, heat transfer is promoted. The temperature distribution can be made uniform.

In this method, the binder liquid is applied to the entire reticulated body, then dried, and the brazing powder is sprayed, so that the process is simple and very efficient. In this case, by adjusting the composition of the binder liquid and the drying time, the amount of the liquid remaining in the liquid reservoir 12b as shown in FIG. 4 can be controlled. Since the amount of the remaining liquid in the liquid reservoir 12b corresponds to the amount of the powder of the brazing material adsorbed thereon, the amount of the brazing material to be brazed at each intersection can be very accurately controlled.
Therefore, the amount of brazing material joining this intersection can be precisely controlled to the minimum necessary, and since the brazing material does not adhere to other portions, even if it is a fine mesh of eyes, it may cause blinding. And precise brazing can be performed.

FIGS. 7 to 12 show a second embodiment of the present invention. First, the configuration of the mesh body to be manufactured by this method will be described with reference to FIGS. In this net-like body, a plurality of relatively large-diameter rods 23 are arranged parallel to each other as elongated strips, and a plurality of small-diameter wires 24 and 25 are orthogonal to the rods 23 as another elongated strip. It is arranged to be. And these wires 24,
As shown in FIG. 8, reference numeral 25 denotes a waveform having a semicircular fitting portion 26, and these fitting portions 26
3 and is in line contact over substantially the half circumference of the bar 23. Note that these wires 24 and 25 are
The rods 23 are fitted alternately from the front side and the back side. Then, the intersection between the bar 23 and the wires 24 and 25, that is, the fitting portion 26 of the wires 24 and 25 and the bar 2
The fitting portion corresponding to the half-peripheral portion of the joint 3 is brazed by a brazing material 27.

Next, a method of manufacturing such a net will be described. First, as shown in FIG. 9, the above-mentioned bar members 23 are held at a predetermined interval with an appropriate jig or the like, and these bar members 23
A thin brazing material paste 32a in which a binder solution and a brazing material powder are mixed is applied to the surface of the substrate. The brazing material paste 32a can be applied by a method such as spraying or dipping in the paste solution.

Next, as shown in FIG.
4 and 25 are held at a predetermined interval by an appropriate jig or the like,
Next, as shown in FIG. 11, the fitting portions 26 of these wires 24 and 25 are fitted to the bar 23.

The rod 23 and the wires 24, 2
5 are relatively moved in the axial direction of these bar members 23. By such a movement, the fitting portion 2 of these wires 24, 25
Numeral 6 slides in the axial direction with the peripheral surface of the bar 23.
Then, by the sliding of the fitting portions 26 of the wires 24 and 25, the brazing material paste 3
As shown in FIG. 12, the scraped brazing material paste 32b is applied to the fitting portions 2 of the wires 24 and 25.
6 and the bar 23 are accumulated at the intersection. In addition, if the above-mentioned axial movement is reciprocal movement as required, the wire 2
The brazing material paste 32b can be accumulated on both sides of the 4, 25 fitting portions 26. Then, the net is carried into a heating furnace or the like, and the rods 23 and the wires 24 and 25 are moved.
Is heated and the brazing material is melted and brazed.

The effect of the above-described method is the same as that of the first method described above.
This is the same as the method of the embodiment. In the method of the second embodiment, since the brazing material paste is raked and accumulated, a large amount of brazing material paste can be accumulated in the gap at the intersection of the bar and the wire. Therefore, even in the case of a large reticulated body, a large amount of brazing material can be held in the gap at the intersection of the elongated strips.

The present invention is not limited to the above embodiment. For example, the reticulated body produced by this method is not necessarily limited to the above-described wire mesh or lattice-shaped reticulated body, and is a reticulated body that is a structure in which elongated strips intersected for various uses. And the above method can be applied even if the structure is different.

Further, the above-mentioned elongated strip is not limited to the above-mentioned wires and rods, but may be a pipe, a flat plate, a mold,
As described above, an elongated strip having any other shape may be used.

[0031]

As described above, according to the present invention, the paste of the brazing material adheres only to the intersections of the elongated strips, and only the intersections can be brazed. Therefore, the brazing material is not wasted, the appearance is improved,
Problems such as crushing by the brazing material do not occur. Further, the present invention has a great effect, for example, the process is simple and a net-like body brazed only at the intersection as described above can be efficiently produced.

[Brief description of the drawings]

FIG. 1 is a plan view of a mesh body according to a first embodiment.

FIG. 2 is a sectional view taken along line 2-2 in FIG. 1;

FIG. 3 is a cross-sectional view illustrating a process of the first embodiment.

FIG. 4 is a cross-sectional view illustrating a process of the first embodiment.

FIG. 5 is a cross-sectional view illustrating a process of the first embodiment.

FIG. 6 is a cross-sectional view illustrating a process of the first embodiment.

FIG. 7 is a plan view of a mesh body according to the second embodiment.

FIG. 8 is a sectional view taken along line 8-8 in FIG. 7;

FIG. 9 is a sectional view illustrating a step of the second embodiment.

FIG. 10 is a sectional view illustrating a step of the second embodiment.

FIG. 11 is a sectional view illustrating a process of the second embodiment.

FIG. 12 is a cross-sectional view illustrating a process of the second embodiment.

[Explanation of symbols]

 3, 4 Wire rod (strip) 5 Brazing material 11 Binder liquid 12a, 12b Liquid pool portion 12c Brazing paste 23 Bar (strip) 24, 25 Wire (strip) 27 Brazing material 32a, 32b Brazing material paste

Claims (2)

[Claims] 1. A method of manufacturing a net-like body comprising a plurality of elongated bodies combined so as to intersect with each other, and brazing the intersections of these elongated bodies to each other. Crossing each other and combining them; adhering a binder liquid having wettability to the surface of the above-mentioned elongated strip to the surface of these elongated strips; A step of forming a liquid pool portion, and evaporating the binder liquid adhered to the elongated strip, leaving only the binder liquid in the liquid pool portion held at the intersection of these elongated strips, Evaporating and drying the binder liquid adhering to the other part; and bringing the brazing filler metal powder into contact with at least the above-mentioned binder liquid reservoir, and bringing the brazing filler metal powder into the above-mentioned liquid reservoir part. A step of adsorbing and mixing with the binder liquid and adhering the brazing material paste mixed with the brazing material and the binder liquid to the intersections of these elongated strips, and heating the elongated strips to form the intersections of these elongated strips. And a step of brazing to each other. 2. A method for producing a mesh body comprising a plurality of elongated bodies combined so as to intersect with each other, and brazing the intersections of these elongated strips to each other, wherein at least a part of the above-mentioned mesh body is provided. A step of applying a brazing material paste obtained by mixing a brazing powder and a binder liquid on the surface of the elongated strip; a step of arranging the elongated strips so as to intersect with each other; Moving the portions relative to each other so as to slide, and accumulating the brazing material paste on the surface in the gaps at the intersections of the elongated strips by the relative sliding; and Heating and brazing the intersecting portions of these elongated strips to each other.