JP5597370B2 - Wire mesh joining method - Google Patents

Description

The present invention relates to a wire mesh joining method. More particularly, the present invention relates to an improved joining method of a joined structure between a wire mesh and a metal mesh, and a joined structure between a wire mesh and a metal plate, which is processed into a target object while being shaped like a strip or from a large area joined product .

  Conventionally, as a technique for joining metal meshes or between a metal mesh and a metal plate, a lap resistance welding (seam welding) method and a sintering method have been put into practical use. The lap resistance welding method is a welding technique in which two types of thin metal bodies to be joined are sandwiched between a pair of opposing electrode rolls, and the electrodes are energized while being pressed together to continuously join them. When joining by this method, if the pressurizing force between the electrode rolls is increased in order to improve the strength of the joining portion, problems such as collapse of the wire mesh, deformation of the wire mesh, and fusing of the wire are likely to occur. In addition, according to the lap resistance welding method, the surfaces of the joined ones are burned, the appearance is deteriorated, and post-treatment such as acid cleaning may be necessary.

  The sintering method is a technique in which two kinds of metal bodies to be joined are brought into contact with each other at a temperature equal to or lower than the melting temperature of the material metal and joined by utilizing the mutual diffusion action of atoms. When joining by this method, it is only necessary to heat the surface of the two types of metal bodies to a temperature at which the surfaces of the two types of metal bodies melt, and pressurize to such an extent that the two types of metal bodies can be joined. There is no inconvenience. However, for example, when joining a long metal body having a length of 10 m, a uniform load cannot be applied to the interface to be sintered. When trying to obtain a long one by this sintering method, first, prepare a plurality of long ones cut into a strip of the same width and then sintered, and then a sintered strip The operation | work of welding the length direction edge part of this and making it a long thing was required, and it was complicated.

JP 2002-103264 A

Under such circumstances, the present inventor has intensively studied to provide a joining technique that eliminates various disadvantages existing in the prior art, and as a result, has completed the present invention. That is, the object of the present invention is as follows.
1. To provide a joining method in which a wire mesh is not easily crushed by pressure applied between electrode rolls of a lap resistance welder, and problems such as wire mesh deformation, wire melting, and wire fusing are unlikely to occur.
2. To provide a method for joining two types of long metal bodies without any inconvenience.

In order to solve the above problems, the present invention, a wire mesh between the diameter 0.02~2.0mm cross section a circular shape, or a sheet metal of the wire mesh and thickness 0.05~1.00mm piled In joining, the two types of metal bodies to be joined are combined with each other having a melting temperature difference within 300 ° C. First, the first step of joining the two to some extent by the lap resistance welding method, and then the sintering method by viewing contains a second step to complete the bonding of both the lap resistance welding method of the first step, current 1KA～50KA, pressure 0.5~10KN by the pair of rolls, the feed rate 1 to 10 m / min The sintering in the second step is performed for 0.5 to 5.0 hours at a temperature up to 70% of the melting temperature of the metal on the low melting side of the metal body constituting the metal mesh or metal sheet, By lap resistance welding in the first process Peel strength after cooling to room temperature after the contact is adjusted to exert more than 0.1% of the intensity of the peel strength at room temperature of the bonding material obtained after completion of the second step, characterized in that Provide a wire mesh joining method.

The present invention is as described in detail below, has the following effects, and its industrial utility value is extremely large.
1. According to the joining method according to the present invention, it is not necessary to apply a high pressure to the two kinds of metal bodies in order to improve the strength, so that the two kinds of metal bodies are hardly deformed or cut.
2. According to the joining method according to the present invention, even if the surface of the material joined in the first step is burned, it can be removed by adjusting the atmosphere in the second step. It is unnecessary.
3. According to the joining method according to the present invention, since a long thing can be joined without cutting a wide thing into a strip shape with the same dimensional width and welding to make it long as before, it is extremely efficient. Is.

FIG. 1 is a schematic side view of an example illustrating a first step of a joining method according to the present invention. It is a partial expanded sectional view of an example of the joined body of the metal plate and wire mesh obtained by the joining method concerning the present invention. It is a partial expanded sectional view of the joined object joined by the conventional method.

  Hereinafter, the present invention will be described in detail. The joining method according to the present invention is applied when two kinds of metal bodies such as metal meshes or metal meshes and a metal thin plate are overlapped and joined. Although the metal which comprises a metal-mesh and a thin plate may be the same kind, combining different things is preferable since the characteristics of two kinds of metal bodies can be utilized. Examples of the metal type of the metal wire for wire mesh preparation include iron, cast iron, mild steel, stainless steel, nickel alloy, titanium alloy, copper alloy, and aluminum alloy. The cross-sectional shape of the metal wire includes a circular shape, an elliptical shape, a rectangle, a square, etc., which are cut at right angles to the length direction. Difficult to prepare a metal wire, difficult to prepare a metal mesh from a metal wire, and finally Depending on the use of the joined body obtained, the one having a perfect circular cross section is preferable.

  When the cross section of the metal wire constituting the metal mesh is a perfect circle, the diameter is preferably selected in the range of 0.02 to 2.00 mm. When the diameter is less than 0.02 mm, it is difficult to adjust the metal wire, and when the diameter exceeds 2.0 mm, it is difficult to prepare the wire mesh, which is not preferable. The range of 0.1 to 1.0 mm is particularly preferable in the above range.

  The method for weaving the wire mesh with the metal wire is not particularly limited, and may be plain weave, twill weave, twill weave, twill weave or the like, and can be selected according to the use of the finally obtained joined body. If the mesh of the metal mesh is too fine, the mesh of the mesh will be collapsed when joining by the lap resistance welding method, and if the mesh of the mesh is too coarse, the mesh will be joined by the lap resistance welding method. In this case, the metal wire cannot be joined unless the applied pressure is increased and the metal wire is crushed, so that it can be appropriately selected according to (in proportion to) the diameter of the metal wire. There is no restriction | limiting in particular in the length of a metal-mesh, Since it can wind in roll shape in the case of a long length, it can be made the length of the range which can be joined. Since the width of the wire mesh is joined by the lap resistance welding method in the first step, the width of the wire mesh is limited by the apparatus employed in this method. The model currently in practical use is limited to a width of 100 mm, but is not limited to this width.

  The type of metal constituting the metal thin plate is preferably the same type or the same type of alloy as the metal constituting the metal wire for preparing the wire mesh. The thickness of the metal thin plate can be selected in the range of 0.05 to 1.00 mm depending on the use of the finally obtained joined body. If the thickness of the metal thin plate is too small, irregularities are likely to occur when joining by the lap resistance welding method, and if the thickness of the metal thin plate is too large, it is not suitable for joining by the lap resistance welding method. Preferably, a thin metal plate is combined with a metal wire having a small diameter, and a thick metal plate is combined with a metal wire having a large diameter. A range of 0.1 to 0.50 mm is particularly preferable in the above range. The length and width of the metal thin plate are preferably the same as those of the above-described wire mesh.

  As for the combination of the two kinds of metal materials to be joined, those having a melting temperature difference of 300 ° C. or less are preferably combined. The reason why the difference in melting temperature between the two kinds of metal materials is preferably within 300 ° C. is as follows. Generally, the temperature when sintering two kinds of metal materials is about 80% of the melting temperature of the metal materials. For example, in the case of iron, the melting temperature is 1538 ° C., and the temperature difference when sintering in combination with a metal material having a higher melting temperature than iron is limited to 1538 ° C. × 0.2 (%) = 308 ° C. Therefore, it is preferable that the temperature difference is within 300 ° C., and the temperature is up to 70% of the melting temperature of the metal material having a low melting temperature among the two types of metal materials. If the temperature difference when sintering two kinds of metal materials exceeds 300 ° C, the metal mesh or metal plate of the metal material having a low melting temperature is significantly deformed when joining by the sintering method in the second step. The quality of the later product is not excellent. Furthermore, even when a metal mesh or a metal plate made of a metal material having a low melting temperature is melted and deformed significantly, the metal material having a high melting temperature may not be melted and cannot be preferably joined. The bonding temperature is up to 70% of the metal material with a low melting temperature, the heating time is the type and form of the two types of metal bodies, and the setting of the sintering furnace when sintering in the second step Although it depends on temperature and the like, it can be selected in the range of 0.5 to 5.0 hours.

  When the bonding method according to the present invention is used, the finally obtained bonded body is manufactured in two steps. By joining in two steps, it is possible to eliminate the problems existing in the prior art. In the lap resistance welding (seam welding) method in the first process, two types of materials that are joined between a pair of rolls that can be approached and separated and energized from one side are sandwiched between the rolls. It is the welding method to join. The lap resistance welding (seam welding) machine to be used is preferably equipped with a pair of rolls prepared with copper, beryllium copper alloy, etc. within a diameter range of 100 mm to 2000 mm, and equipped with a safety cover on this roll part. . As a mechanism for moving the pair of rolls closer to and away from each other and applying pressure to the material sandwiched between the rolls, a spring mechanism, a screw mechanism, or the like may be provided on one or both of the pair of rolls.

  Joining conditions by the lap resistance welding (seam welding) machine in the first process are as follows: metal types of two types of materials to be joined between rolls, two types of combinations to be joined (metal meshes or metal mesh and metal sheet) ), Depending on the diameter of the metal wire constituting the wire mesh, the degree of density of the mesh (mesh) of the wire mesh, the thickness of the metal plate, etc., but can be appropriately selected from the following conditions. The strength of the current that can be applied between the pair of rolls is in the range of 1 KA to 50 KA, the pressure that can be applied between the pair of rolls is in the range of 0.05 to 10 KN, and the feed rate of the material between the rolls is in the range of 1 to 10 m / min. Etc.

  In the first step, the metal meshes or the metal mesh and the metal thin plate are joined to some extent by the lap resistance welding (seam welding) method. Here, “joining to some extent” means at least the degree to which the joining portion does not peel during the sintering process after the transition to the second sintering process and after the transition to the sintering process. The determination (determination) of the degree of joining can be performed by confirming the optimum condition in a prior experiment and setting the optimum condition. The temperature of the weld zone in this first step, which can be adjusted by selecting the applied current, applied voltage, feed rate, pressure applied by the roll, etc. to the material, is preferably 1400 ° C. or lower. A safety cover may be attached to a portion to be welded by a pair of rolls, and an inert gas may be present in the atmosphere in the cover. The peel strength after cooling the one welded by the lap resistance welding in the first process to room temperature, exhibits a strength of 0.1% or more of the peel strength at room temperature for the joined product obtained after the end of the second process Is preferable.

  In the second step, the untransferred joint transferred from the first step is completed mainly by batch-type sintering. Here, “to complete the joining” means that the two kinds of materials to be joined are joined so as to exhibit a joining strength higher than the joining strength only in the first step, without deforming, cutting, or damaging them. . Whether or not the joining of the two types of materials has been completed is confirmed by visual observation of the appearance (whether the wire mesh is deformed, whether it is cut, whether the surface is burned, etc.) through prior experiments with different sintering conditions. Since the bonding strength can be measured and confirmed, it is easy to select the optimum conditions. Sintering in the second step can be performed in a sintering furnace. The sintering temperature varies depending on the diameter of the metal wire constituting the wire mesh, the degree of density of the mesh of the wire mesh (mesh), the thickness of the metal plate, the sintering time, the degree of bonding in the first step, etc., but the melting temperature Is selected in a temperature range where the lowest temperature is about 70% of a low-temperature metal material and the highest temperature is 1400 ° C. The sintering time mainly depends on the sintering temperature, but is selected in the range of 1 to 4 hours. In order to manufacture the intended joined body (final product), it is only necessary to set the optimum conditions confirmed by a prior experiment.

Embodiment examples of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view illustrating an example of the first step of the bonding method according to the present invention. In FIG. 1, 1 is a metal thin plate wound in a roll shape, and 2 is a wire mesh made in a roll shape. 3 and 4 are guide rolls, 5 and 6 are electrode rolls, and 8 is a joined body obtained in the first step. The rolled metal plate 1 and the metal mesh 2 are rewound and transferred to a lap resistance welding (seam welding) machine constituted by the electrode rolls 5 and 6 while being tensioned by the guide rolls 3 and 4. In the lap resistance welding machine, one or both of the electrode rolls 5 and 6 are provided with a mechanism (not shown) for applying pressure to the materials to be joined, and both of the electrode rolls 5 and 6 are covered with a cover 7. As described above, it can be covered. The obtained bonded body 8 is stacked in a roll shape or a predetermined length as shown in FIG.

  The joined body 8 obtained in the first step is transferred to a sintering furnace for performing the second step, and sintered in a batch system to complete the joining. FIG. 2 is a partially enlarged cross-sectional view of an example of a joined body of a metal plate and a wire net obtained by the joining method according to the present invention. In FIG. 2, 21 is a metal plate, and 22 is a wire constituting a wire mesh. FIG. 3 is a partially enlarged cross-sectional view of an undesirable joined body in which a wire mesh is crushed by overheating and / or high pressure during lap resistance welding (seam welding) in the first step. In FIG. 3, 31 is a metal plate, and 32 is a wire constituting a wire mesh.

  EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to the following description examples, unless the summary is exceeded.

[Example 1]
<Example of joining a wire mesh and a thin metal plate>
The wire mesh used in this example is made of sus316, plain weave with a wire having a diameter of 0.1 mm, a mesh of 100 mesh, a width of 8.1 mm, and a length of 50 mm. The thin metal plate used is made of sus316, has a thickness of 0.3 mm, a width of 8.1 mm, and a length of 50 m.

<Joint conditions for the first step>
The lap resistance welding (seam welding) machine used is a prototype equipped with a roll made of chromium copper alloy and having a roll diameter of 250 mm and a roll length of 20 mm. 6V × 4KA between the rolls with a roll pressure of 1.3KN, a feed rate of 3m / min, and a pulse rate of 50 times / second, with the wire mesh and metal plate overlapped between a pair of rolls. Bonding was performed according to the conditions for applying the electric power.

<Measurement of bonding strength>
Ten joints that have been joined in the first step and cooled to room temperature are forcibly removed at the end in the length direction, the peeled end is held with a clamp, and a strength measuring instrument in accordance with JIS Z2241 ( The peel strength was measured at normal temperature by Orientec Co., Ltd. (model: RTC-1250A). The peel strength was a minimum value of 0.07 kg / cm, a maximum value of 0.4 kg / cm, and the average value of 10 joined bodies was 0.25 kg / cm.

<Bonding conditions for the second step>
Using a prototype sintering apparatus (250 mm height, 250 mm width, depth 750 mm inside the vacuum furnace), with a vacuum degree of 10 ⁻³ torr, a heating temperature of 1200 ° C., and a heating time of 2.5 hours, Joining was completed.

<Measurement of bonding strength>
For the joined body that has been joined in the second step and cooled to room temperature, it is forcibly peeled off at the end in the length direction in the same manner as the joined body obtained in the first step, and peeled in the same manner as described above. The strength was measured. Even when all 10 bonded bodies were pulled with a force of 12 kg / cm or more, the bonded portion did not peel off, and the unbonded wire mesh was cut.

[Example 2]
<Example of joining wire mesh and wire mesh>
The two wire meshes used in this example are made of pure titanium, with a wire having a diameter of 0.1 mm, a plain weave of 100 mesh, a width of 8.1 mm, and a length of 10 mm It is.

<Joint conditions for the first step>
Using the same lap resistance welding machine (prototype) as used in Example 1 with two metal meshes stacked, the roll pressure was 0.11 KN, the feed rate was 4 m / min, and the pulse was 50 Bonding was performed under the condition of applying a power of 6 V × 4 KA between the rolls at an interval of times / second, and 10 bonded bodies were similarly bonded.

<Measurement of bonding strength>
The peel strength was measured by the same method as described above for 10 joined bodies that were completely joined in the first step and cooled to room temperature. The peel strength was a minimum value of 0.07 kg / cm, a maximum value of 0.3 kg / cm, and the average value of 10 bonded bodies was 0.20 kg / cm.

<Bonding conditions for the second step>
The same sintering apparatus as used in Example 1 was used, and the joining was completed under the conditions that the degree of vacuum was 7.5 × 10 ⁻⁶ torr, the heating temperature was 1200 ° C., and the heating time was 3 hours.

<Measurement of bonding strength>
The peel strength was measured for the joined body that had been joined in the second step and cooled to room temperature in the same manner as described above. Even when all 10 bonded bodies were pulled with a force of 16 kg / cm or more, the bonded portions were not peeled off, and the unbonded portions were cut.

  Applications of the product obtained by the joining method according to the present invention include, for example, the following equipment and structures, that is, distillation tower, reactor, reaction tower, reaction tank, agitation tank, separator, press punching molding It can be used as a hoop material or various filter members.

1, 21, 31, 41: metal thin plates 2, 22, 32, 42: wire mesh 3, 4: guide roll 5, 6: electrode roll 7: cover 8: joined body

Claims (1)

When joining the metal nets having a perfect circular cross section and having a diameter of 0.02 to 2.0 mm , or this metal net and a metal thin plate having a thickness of 0.05 to 1.00 mm , A combination of metal bodies having a melting temperature difference of 300 ° C. or less, first a first step of joining the members to some extent by a lap resistance welding method, and then a second step of completing the joining of both by a sintering method only including, a lap resistance welding method of the first step, current 1KA～50KA, pressure 0.5~10KN by the pair of rolls, done in the conditions of feed rate 1 to 10 m / min, the sintering in the second step After the metal mesh constituting the metal mesh or metal sheet is welded by lap resistance welding in the first step for 0.5 to 5.0 hours at a temperature of up to 70% of the melting temperature of the metal on the lower side. Peel strength after cooling to room temperature Method of bonding wire mesh characterized by adjusting to it to exert more than 0.1% of the intensity of the peel strength at room temperature for the second step after the end of the resulting assembly.

Images