JP6067441B2 - Brazing apparatus and brazing method - Google Patents

Description

  The present invention relates to a brazing apparatus and a brazing method used for manufacturing various brazed products such as heat exchangers and radiators.

  In the present specification, unless otherwise specified, the term “aluminum” is used to mean not only pure aluminum but also an aluminum alloy.

  Brazing methods used for manufacturing various brazed products are roughly classified into a flux brazing method and a fluxless brazing method. As a fluxless brazing method, a vacuum brazing method is generally known, and a VAW method is also known. Known flux brazing methods include in-furnace brazing and nocolok brazing. JP 2010-17724 A (Patent Document 1) and JP 2011-614 A (Patent Document 2) disclose a method of manufacturing a heat exchanger by a flux brazing method.

  In any of these brazing methods described above, the brazing material of the workpiece is brazed by heating and melting the brazing material interposed in the planned brazing portion (scheduled joining interface) of the workpiece with the heat of a predetermined heat source. Is done.

JP 2010-17724 A JP 2011-614

  Among these brazing methods, in the vacuum brazing method, the heat of the heat source is transmitted to the workpiece by radiant heat transfer, and the brazing material is heated and melted. In the VAW method, the in-furnace brazing method and the Nocolok brazing method, the heat of the heat source is transferred to the workpiece by radiation and convection heat transfer, and the brazing material is heated and melted. However, these brazing methods have room for improvement with respect to the rate of temperature rise of the workpiece.

  The present invention has been made in view of the above-described technical background, and an object thereof is to provide a brazing apparatus and a brazing method which are improved from the conventional brazing apparatus and brazing method.

  The present invention provides the following means.

[1] A sealed body in which a work having a brazing planned portion provided with a brazing material is disposed, and the inside is made an inert gas atmosphere when the brazing material is melted,
A heating element disposed outside the sealing body;
Comprising
The heating element is in contact with the outer surface of the outer peripheral wall portion of the sealing body and the inner surface of the outer peripheral wall portion of the sealing body is in contact with the workpiece, and heat of the heating element is transferred from the heating element to the sealing body. The brazing filler metal is melted by conducting heat transfer to the workpiece through the outer peripheral wall portion of
An absorption portion for absorbing thermal expansion in a direction parallel to the outer surface of the outer peripheral wall portion generated when the brazing material is melted is provided around the contact portion of the outer peripheral wall portion of the sealing body with the heating element. A brazing device characterized by that.

[2] The sealing body includes a sealing body main body and a lid member corresponding to the sealing body main body and forming at least a part of the outer peripheral wall portion,
A sealing member is interposed between the outer sealing portion of the lid member and the sealing body main body,
When the brazing material is melted, the seal portion of the outer peripheral portion of the lid member is relatively pressed in a direction in which the seal portion is in close contact with the seal portion of the sealing body main body via the seal member in a cooled state. Is,
The contact portion with the heating element in the outer peripheral wall portion of the sealing body is located at a substantially central portion of the lid member,
The brazing device according to the preceding item 1, wherein the absorbing portion is provided inside the seal portion of the outer peripheral portion of the lid member and around the contact portion with the heating element.

  [3] The brazing device according to item 1 or 2, wherein the absorbing portion is formed by bending a part of the outer peripheral wall portion into a corrugated cross section.

  [4] The brazing device according to any one of the preceding items 1 to 3, wherein the absorbing portion is provided around the contact portion with the heating element in the outer peripheral wall portion so as to surround the contact portion. .

[5] The heating elements are respectively arranged on both outer sides of the work arrangement position in the sealing body,
The items 1 to 4 above, wherein the heat of each heating element is transferred from each heating element to the workpiece through the outer peripheral wall portion of the sealing body by conductive heat transfer, thereby melting the brazing material. The brazing apparatus according to any one of the above.

  [6] The brazing device according to item 5 above, wherein each of the heating elements is relatively pressed against the workpiece via the outer peripheral wall portion of the sealing body so as to sandwich the workpiece between the two heating elements. .

[7] A workpiece placement step of placing a workpiece having a brazing planned portion provided with a brazing material inside the sealed body;
After the workpiece placement step, the inside of the sealing body is brought to an inert gas atmosphere, and the heating element arranged outside the sealing body is brought into contact with the outer surface of the outer peripheral wall portion of the sealing body, and the sealing body Melting that melts the brazing material by transferring the heat of the heating element from the heating element to the workpiece through the sealing body by conductive heat transfer with the inner surface of the outer peripheral wall in contact with the workpiece. Process,
Including
In the melting step, thermal expansion in the direction parallel to the outer surface of the outer peripheral wall portion generated during the melting step is absorbed around the contact portion of the outer peripheral wall portion of the sealing body with the heating element. A brazing method characterized by absorbing by a part.

[8] The sealing body includes a sealing body main body, and a lid member corresponding to the sealing body main body and forming at least a part of the outer peripheral wall portion,
A sealing member is interposed between the outer sealing portion of the lid member and the sealing body main body,
During the melting step, the seal portion of the outer peripheral portion of the lid member is relatively pressed in a direction in which the seal portion is in close contact with the seal portion of the sealing body main body through the seal member in a cooled state.
The contact portion with the heating element in the outer peripheral wall portion of the sealing body is located at a substantially central portion of the lid member,
The brazing method according to the preceding item 7, wherein the absorbing portion is provided inside the seal portion of the outer peripheral portion of the lid member and around the contact portion with the heating element.

  [9] The brazing method according to item 7 or 8, wherein the absorbing portion is formed by bending a part of the outer peripheral wall portion into a corrugated cross section.

  [10] The brazing method according to any one of items 7 to 9, wherein the absorbing portion is provided around the contact portion with the heating element in the outer peripheral wall portion so as to surround the contact portion. .

[11] The heating elements are respectively arranged on both outer sides of the work arrangement position in the sealing body,
In the melting step, the heat of each heating element is transferred from each heating element to the workpiece through the outer peripheral wall portion of the sealing body by conductive heat transfer, thereby melting the brazing material according to the preceding items 7 to 10 The brazing method according to any one of the above.

  [12] The brazing method according to item 11, wherein, in the melting step, the heating elements are relatively pressed against the workpiece via the outer peripheral wall portion of the sealing body so as to sandwich the workpiece between the heating elements. .

  The present invention has the following effects.

  In the brazing device in [1] above, the heat of the heating element as a heat source is transmitted to the work by conduction heat transfer, so that the heat of the work is increased compared to the case of transferring the heat of the heat source to the work by radiant heat transfer or convection heat transfer. The speed of temperature can be increased, and as a result, the time required for brazing (that is, brazing time) can be shortened, and the amount of heat required for brazing can be further reduced. . Further, since the workpiece is arranged inside the sealing body, the inside of the sealing body can be made an inert gas atmosphere when the brazing material is melted, and thus the brazed portion of the workpiece is brazed well. be able to.

  Furthermore, when the brazing material is melted, the inside of the sealed body is made an inert gas atmosphere, so the inert gas pressure inside the sealed body (inner pressure of the sealed body) is changed to the pressure outside the sealed body (atmospheric pressure). Can be balanced. Therefore, the thickness of the outer peripheral wall portion of the sealing body can be set thin. As a result, the workpiece heating rate can be further increased. As a result, the time required for brazing can be further shortened, and the amount of heat required for brazing can be further reduced. Can be achieved.

  In addition, when the brazing material is melted, the outer peripheral wall portion of the sealing body is heated by the heat of the heating element and thermally expands in a direction parallel to the outer surface of the outer peripheral wall portion. It is absorbed by the absorption part provided in the circumference | surroundings of the contact part with the heat generating body in a wall part. Thereby, the deformation | transformation by the thermal expansion of the outer peripheral wall part of a sealing body can be prevented. Therefore, when the brazing material is melted, the contact state between the heating element and the outer surface of the outer peripheral wall part and the contact state between the inner surface of the outer peripheral wall part and the workpiece can be maintained well, and the sealing body is used repeatedly. can do.

  In the preceding item [2], since the sealing body includes the sealing body main body and the lid member, the sealing member is opened by opening the lid member when the workpiece is put into the sealing body or when the workpiece is taken out from the sealing body. The work can be easily taken in and out of the body, and the sealed body can be used repeatedly with certainty. Furthermore, since the seal member is interposed between the mutual seal portions of the outer peripheral portion of the lid member and the seal body, the inside of the seal body can be reliably maintained in an inert gas atmosphere.

  In addition, the sealing portion of the outer peripheral portion of the lid member is in a cooled state when the brazing material is melted, thereby preventing thermal deterioration of the sealing member. It can be maintained well. Furthermore, since the seal part of the outer peripheral part of the lid member is in a cooled state as described above and is fixed by being relatively pressed in a direction in close contact with the seal part of the sealed body, the lid member A large thermal expansion occurs in the lid member due to a large temperature difference between the temperature of the outer peripheral portion of the lid and the temperature of the contact portion of the lid member with the heating element. However, since the absorption part is provided inside the seal part on the outer peripheral part of the lid member and around the contact part with the heating element, even the large thermal expansion is reliably absorbed by the absorption part. can do.

  In the preceding item [3], since the absorbing portion is formed by bending a part of the outer peripheral wall portion into a corrugated cross section, the thermal expansion can be reliably absorbed and the absorbing portion is easily formed. be able to.

  In the preceding item [4], the thermal expansion can be more reliably absorbed by the absorption portion being provided around the contact portion with the heating element in the outer peripheral wall portion so as to surround the contact portion.

  In the preceding item [5], since the heating elements are respectively arranged on both outer sides of the work arrangement position on the sealing body, only one of the outer sides of the heating element on both sides of the work arrangement position on the sealing body is arranged. Compared with the case where it is arrange | positioned, the further increase in the temperature increase rate of a workpiece | work can be attained, As a result, the time required for brazing can further be shortened.

  In the previous item [6], each heating element is relatively pressed against the work through the outer peripheral wall portion of the sealing body so that the work is sandwiched between the two heating elements. A brazing load can be applied to the part to be brazed of the work, whereby the part to be brazed of the work can be brazed better.

  The brazing method of the previous items [7] to [12] has the same effects as the effects of the brazing apparatus of [1] to [6].

FIG. 1 is a schematic plan view of a brazing apparatus according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line XX in FIG. FIG. 3 is an exploded view centering on the mutual seal portion between the sealed container body (sealed body body) and each lid member in the sealed container (sealed body) of the brazing apparatus. FIG. 4 is a schematic plan view of a brazing device according to a second embodiment of the present invention.

  Next, several embodiments of the present invention will be described below with reference to the drawings.

  1-3 is a figure explaining the brazing apparatus 1 and the brazing method which concern on 1st Embodiment of this invention.

  As shown in FIG. 2, the brazing apparatus 1 according to the first embodiment is used as a brazing product, for example, for manufacturing a heat exchanger by an inert gas atmosphere brazing method, and as a sealed body. The sealed container 2, the two pressing members 10, 10, the two heating elements 20, 20 are provided.

  A work 30 is accommodated in the inside 2 a of the sealed container 2. The workpiece 30 has a brazing planned portion 31. In the first embodiment, the workpiece 30 is composed of a plurality of brazed members 33a, 33a, and 33b that are brazed and integrated with each other. These brazed members 33a, 33a, and 33b are all made of metal, and are made of aluminum in the first embodiment. The number of members to be brazed is, for example, three. Of these brazed members 33a, 33a, 33b, the two members 33a, 33a have a substantially flat plate shape and are spaced apart from each other in parallel. The size of each flat member 33a is, for example, width 100 × length 100 × thickness 10 mm. The remaining one member 33b has a corrugated fin shape, and is disposed between the two plate-like members 33a and 33a. The size of the corrugated fin-shaped member 33b is, for example, width 100 × length 100 × height 80 × thickness 1.0 mm. The corrugated fin-like member 33b is formed of a brazing sheet, and brazing material layers 32 and 32 as brazing materials are clad on both surfaces of the core material 33c (8% clad on both sides). Therefore, between the mutual contact portions (that is, the planned joining interface) between the upper flat plate member 33a and the corrugated fin shaped member 33b, and between the lower flat plate member 33a and the corrugated fin shaped member 33b (ie, planned joining). The brazing material layer 32 (brazing material) of the corrugated fin-like member 33b is interposed between the interfaces. Then, the brazing material layer 32 interposed between the mutual contact portions is melted, so that the three brazed members 33a, 33a, 33b are brazed and integrated. That is, this work 30 has such a mutual contact portion as a brazing scheduled portion 31.

  The main brazing component of the brazing material of the brazing material layer 32 is an Al—Si alloy, an Al—Si—Mg (Bi) alloy, or the like. The kind of brazing material is determined according to the brazing method (brazing condition) to be applied, and is not limited. More specifically, for example, when applying the Nocolok brazing method (Nocolok brazing condition) as the brazing method (brazing condition), a brazing material surface with a flux attached thereto is used. For example, when the VAW method (VAW brazing condition) is applied as (brazing condition), a flux-less brazing material is used. In the first embodiment, the material of the core material 33c of the corrugated fin-like member 33b is, for example, A3003, and the material of the brazing material layer 32 (that is, the brazing material) is, for example, A4045 of an Al—Si alloy.

  The whole of the sealed container 2 is formed by an outer peripheral wall 6 serving as a partition wall that partitions the inside 2 a of the sealed container 2 from the outside (outside) of the sealed container 2. That is, the inside 2 a of the sealed container 2 is enclosed and surrounded by the outer peripheral wall 6 from the outside (outside) of the sealed container 2.

The inside 2a of the sealed container 2 is an inert gas atmosphere when the brazing material (the brazing material layer 32) is melted. Here, in the first embodiment, it is assumed that the inert gas is, for example, N ₂ gas (that is, nitrogen gas). When melting the brazing filler metal, the N ₂ gas pressure inside the sealed container 2 (that is, the internal pressure of the sealed container 2) is set to a pressure that is balanced with the pressure outside the sealed container 2 (ie, atmospheric pressure). Specifically, it is set to about 1 atmosphere. The sealed container 2 is horizontally disposed and held at a predetermined height position by a holding member (not shown).

  Next, the configuration of the sealed container 2 will be described in detail below.

  The size of the sealed container 2 is set according to the size of the workpiece 30 and the like, and is not limited. For example, the width of the sealed container 2 is set to 300 to 1000 mm, the length is set to 300 to 1000 mm, and the height (thickness) is set to 50 to 200 mm.

  The sealed container 2 includes a sealed container body 3 as a sealed body, two plate-like lid members 5 and 5 that can be opened and closed with respect to the sealed container body 3, and the like. The sealed container body 3 and the lid members 5 and 5 are both made of metal that can withstand the heat generated when the brazing material is melted, and is made of stainless steel such as SUS304.

  The sealed container body 3 includes an outer wall portion 4 having a substantially rectangular frame shape in plan view, and the upper surface and the lower surface of the outer wall portion 4 are opened.

  One lid member 5 of the two lid members 5, 5 closes the upper opening of the sealed container body 3 (more specifically, the upper opening of the outer wall 4 of the sealed container body 3) so as to be freely opened and closed. It is. This lid member 5 is particularly referred to as an “upper lid member”. The other lid member 5 closes an opening on the lower side of the sealed container body 3 (more specifically, an opening on the lower side of the outer wall portion 4 of the sealed container body 3) so as to be freely opened and closed. This lid member 5 is particularly referred to as a “lower lid member”. The lower lid member 5 constitutes a plate-like bottom wall portion of the sealed container 2 when closed with respect to the sealed container body 3.

  Each of the upper and lower openings of the sealed container body 3 has a shape in a plan view. The upper lid member 5 and the lower lid member 5 have shapes corresponding to the upper and lower openings of the sealed container main body 3, respectively, that is, have a shape in plan view (see FIG. 1).

  In the first embodiment, the outer peripheral wall 6 of the sealed container 2 is configured (formed) by the sealed container main body 3 (more specifically, the outer wall 4 of the sealed container main body 3) and the lid members 5 and 5. Yes.

  In the sealed container 2, as shown in FIG. 3, the seal part 3 z with the outer peripheral part 5 x of each lid member 5 in the sealed container body 3 is composed of upper and lower end surfaces of the outer wall part 4 of the sealed container body 3. The seal portion 5z with the sealed container body 3 in the outer peripheral portion 5x of each lid member 5 is formed from the inner surface of the outer peripheral portion 5x of each lid member 5.

  A groove is formed in the seal portion 3z of the sealed container body 3 (that is, the outer wall portion 4), and the seal member 8 is disposed in the groove. In the state where each lid member 5 is closed with respect to the sealed container body 3, the seal member 8 includes a mutual seal portion 3 z between the sealed container body 3 and the outer peripheral portion 5 x of each lid member 5, as shown in FIG. It is interposed between 5z.

  The seal member 8 is an annular rubber gasket (including packing) having a substantially rectangular shape in plan view. Further, the seal member 8 has a circular cross section.

  One pressing member 10 of the two pressing members 10, 10 closely contacts the seal portion 5 z of the outer peripheral portion 5 x of the upper lid member 5 to the upper seal portion 3 z of the sealed container body 3 via the upper seal member 8. In order to press in the direction, the outer surface of the outer peripheral portion 5x of the upper lid member 5 is pressed. This pressing member 10 is particularly referred to as an “upper pressing member”. The other pressing member 10 is arranged to press the seal portion 5z of the outer peripheral portion 5x of the lower lid member 5 in a direction in which the seal portion 5z is in close contact with the lower seal portion 3z of the sealed container body 3 via the lower seal member 8. The outer surface of the outer peripheral portion 5x of the lid member 5 is pressed. This pressing member 10 is particularly referred to as a “lower pressing member”.

  As shown in FIG. 1, the pressing member 10 has a rectangular frame shape in plan view, and is disposed outside the outer peripheral portion 5 x of the corresponding lid member 5. The holding member 10 is made of a metal that can withstand the heat generated when the brazing material is melted, and is made of stainless steel such as SUS304. The detailed configuration of the pressing member 10 will be described later.

  Two heating elements 20 are arranged one by one on both the upper and lower sides across the work arrangement position in the sealed container 2. When the brazing material is melted, the heat of each heating element 20 is such that each heating element 20 contacts the outer surface of the outer peripheral wall portion 6 of the sealed container 2 and the inner surface of the outer peripheral wall portion 6 of the sealed container 2 is the workpiece. The brazing material is heated and melted simultaneously by conduction heat transfer from each heating element 20 to the work 30 through the outer peripheral wall 6 of the sealed container 2 while being in contact with the heat generating member 20. The heating element 20 is composed of, for example, a heating head of an electric heater, and is configured so that the temperature of the heating element 20 can be controlled by increasing or decreasing the amount of current supplied to the heating element 20. Conductive heat transfer is also called heat conduction.

  Here, for convenience of explanation, the heating element 20 arranged on the upper and outer sides of the outer sides of the sealed container 2 across the work arrangement position is referred to as “upper heating element”, and the heating element 20 arranged on the lower outer side is referred to as “lower heating element”. "

  In the first embodiment, the heating surface (heating surface) 20 a of the upper heating element 20 is in surface contact with the outer surface 5 b at the center of the upper lid member 5 forming a part of the outer peripheral wall 6 of the sealed container 2. For example, it is formed in a flat shape. Further, the heating surface 20a is formed in a size that can cover the upper surface of the workpiece 30 (see FIG. 1), and is set to, for example, width 100 × length 100 mm. Similarly, the heating surface (heating surface) 20a of the lower heating element 20 can come into surface contact with the outer surface 5b at the center of the lower lid member 5 forming a part of the outer peripheral wall 6 of the sealed container 2. Specifically, it is formed in a flat shape, for example. Further, the heating surface 20a is formed to have a size capable of covering the lower surface of the work 30, and is set to, for example, width 100 × length 100 mm.

  Therefore, in the first embodiment, the contact portion 5c of the outer peripheral wall portion 6 of the sealed container 2 with the upper heating element 20 is located at the center of the upper lid member 5, and the lower portion of the outer peripheral wall portion 6 of the sealed container 2 is lower. The contact portion 5 c with the heating element 20 is located at the center of the lower lid member 5.

  Further, the brazing device 1 includes a driver 25 for pressing at least one of the upper and lower heating elements 20, 20 against the workpiece 30 through the outer peripheral wall 6 of the sealed container 2. In the first embodiment, the brazing device 1 includes an upper driver 25 and a lower driver as two drivers for pressing both the heating elements 20, 20 against the workpiece 30 through the outer peripheral wall 6 of the sealed container 2. A driver 25 is provided. The upper driver 25 presses the upper heating element 20 against the workpiece 30 from above via the upper lid member 5 of the sealed container 2. The lower driver 25 presses the lower heating element 20 against the workpiece 30 from below through the lower lid member 5 of the sealed container 2. The two heating elements 20 and 20 are simultaneously driven by the driving force of each of the drivers 25 and 25 so that the workpiece 30 is sandwiched between the heating elements 20 and 20 between the two heating elements 20 and 20 via the corresponding lid member 5. It is configured to be pressed. Each driver 25 can control driving operations such as a driving speed, a driving amount, and a driving force. As each driver 25, a fluid pressure (for example, oil pressure, gas pressure) type drive cylinder, an electric drive motor, or the like is used.

The thickness of the outer wall 4 of the sealed container body 3 is not limited, and is set to 3 to 50 mm, for example. Although the thickness of each lid member 5 is not limited, the amount of heat transmitted from each heating element 20 to the work 30 decreases as the thickness increases, so that the thickness is preferably as thin as possible. Specifically, it is particularly desirable to set to 0.1 to 3 mm. By doing so, it is possible to surely increase the rate of temperature increase of the workpiece 30, and it is possible to reliably maintain the inside 2a of the sealed container 2 in the N ₂ gas atmosphere when the brazing material is melted.

  In addition, as shown in FIG. 2, in a state where the work 30 is disposed in the inside 2 a of the sealed container 2, a substantially rectangular shape in a plan view between the mutual seal portions 3 z and 5 z in the inside 2 a of the sealed container 2 and the work 30. A hollow 13 is formed over the entire inner circumference of the mutual seal portions 3z and 5z (that is, over the entire outer circumference of the workpiece 30). Therefore, the workpiece 30 is in contact only with the inner surface 5 a of each lid member 5 and is not in contact with the outer wall portion 4.

Further, the sealed container 2 includes a gas supply pipe 4a for supplying N ₂ gas 9a to the inside 2a of the sealed container 2, and an inside 2a of the sealed container 2 as means for bringing the inside of the sealed container 2 into an N ₂ gas atmosphere. Are connected to a gas discharge pipe 4b for discharging a gas (eg, air, exhaust N ₂ gas) 9b. The gas supply pipe 4a and the discharge pipe 4b are respectively disposed through the outer wall portion 4 so as to communicate the outside and the inside of the sealed container 2 with each other. An N ₂ gas supply source (eg, N ₂ gas cylinder) is connected to the upstream end of the gas supply pipe 4a, and the outlet on the downstream side of the gas supply pipe 4a faces the inside 2a of the sealed container 2. Has been. The gas supply pipe 4a and the discharge pipe 4b are each provided with a flow rate adjusting valve (not shown).

  Further, the sealed container 2 is provided with a seal portion 5z of the outer peripheral portion 5x of each lid member 5 and a cooling portion 11 for cooling each seal member 8. Specifically, the cooling unit 11 is provided in each pressing member 10. That is, the pressing member 10 is formed from a hollow material having a square cross section, and a coolant flow path 11 a extending in the circumferential direction of the pressing member 10 is formed therein. And the cooling liquid (example: cooling water) 11z distribute | circulates to this cooling fluid flow path 11a, and the sealing part 5z and the sealing member 8 of the outer peripheral part 5x of the corresponding cover member 5 are cooled. Further, the holding member 10 includes a cooling liquid supply pipe 11b that supplies the cooling liquid 11z to the cooling liquid flow path 11a from the outside, and a cooling liquid discharge pipe 11c that discharges the cooling liquid 11z from the cooling liquid flow path 11a to the outside. Each is connected. The coolant supply pipe 11b and the discharge pipe 11c are each provided with a flow rate adjusting valve (not shown).

  Furthermore, in this sealed container 2, as shown in FIGS. 1 and 2, the inner side of the outer peripheral portion 5x of each lid member 5 (that is, the central portion side of the lid member 5) and each heating element 20 An absorbing portion 7 is provided around the contact portion (that is, the central portion of the lid member 5) 5c. The absorption part 7 is a part for absorbing thermal expansion in a direction parallel to the outer surface 5b of the lid member 5 generated when the brazing material is melted, and the contact part 5c of the lid member 5 with the heating element 20 The peripheral portion is formed by bending locally into a plurality of cross-sectional corrugations by pressing. Further, as shown in FIG. 1, the absorbing portion 7 is provided so as to surround the contact portion 5c of the lid member 5 with the heating element 20 in a substantially quadrangular annular shape and extend in the circumferential direction around the contact portion 5c. More specifically, it is provided so as to continuously extend over the entire circumference in the circumferential direction centering on the contact portion 5c.

  In the first embodiment, the absorbing portion 7 has a bellows shape, that is, the absorbing portion 7 can be deformed to expand and contract in a bellows shape. The bending shape of the cross section of the absorbing portion 7 will be described in detail as a substantially sinusoidal shape. In more detail, the outer half portion and the inner half portion of each wave portion of the absorbing portion 7 are each formed in a substantially semicircular arc shape, for example. The radius of curvature is set to about 1.5 mm, for example. However, in the present invention, the bent shape of the cross section of the absorbing portion 7 is not limited to a substantially sine wave shape, and may be, for example, a substantially triangular wave shape (including a sawtooth wave shape).

  Next, a brazing method using the brazing apparatus 1 of the first embodiment will be described below.

  First, a workpiece 30 formed from a plurality of brazed members 33a, 33a, and 33b assembled in advance in a predetermined shape is prepared. The work 30 is pretreated for brazing (for example, degreasing, alkali cleaning treatment, oxide film removal treatment) in accordance with a conventional method. Further, a flux is supplied in advance to the brazing material of the work 30 as necessary. In other words, when the brazing scheduled portion 31 of the workpiece 30 is brazed according to, for example, Noclock brazing conditions, the flux is supplied in advance to the brazing material and the brazing planned portion 31 of the workpiece 30 by coating, spraying, or the like. On the other hand, when brazing planned part 31 of work 30 is brazed according to, for example, VAW brazing conditions, flux is not supplied to the brazing material of work 30.

  Next, for example, the upper lid member 5 is opened with respect to the sealed container body 3 as at least one of the lid members 5 and 5. And the workpiece | work 30 is arrange | positioned on the approximate center part of the inner surface 5a of the lower cover member 5 in the inside 2a of the sealed container 2 (placement). Thereby, the inner surface 5a of the lower lid member 5 and the lower surface of the workpiece 30 are brought into contact with each other in a surface contact state. Next, the upper lid member 5 is disposed in a closed state with respect to the sealed container main body 3, whereby the work 30 is accommodated and disposed in the inside 2 a of the sealed container 2. Then, the outer surface 5b of the outer peripheral portion 5x of the upper lid member 5 is pressed by the upper pressing member 10, and the seal portion 5z of the outer peripheral portion 5x of the upper lid member 5 is attached to the upper seal portion 3z of the sealed container main body 3. Press in the direction of contact. Thereby, the seal portion 5z of the outer peripheral portion 5x of the upper lid member 5 is brought into tight contact with the upper seal portion 3z of the sealed container body 3 through the upper seal member 8, and the inner surface 5a of the upper lid member 5 is fixed to the workpiece. 30 is in surface contact. Similarly, the outer surface 5 b of the outer peripheral portion 5 x of the lower lid member 5 is pressed by the lower pressing member 10, and the seal portion 5 z of the outer peripheral portion 5 x of the lower lid member 5 is changed to the lower seal portion 3 z of the sealed container body 3. Press in the direction of close contact through the lower seal member 8. Thereby, the seal portion 5z of the outer peripheral portion 5x of the lower lid member 5 is brought into tight contact with the lower seal portion 3z of the sealed container body 3 via the lower seal member 8, and the lower lid member 5 The inner surface 5a contacts the workpiece 30 in a surface contact state. As a result, the inside 2a of the sealed container 2 is sealed. This process is called “work placement process”.

Next, the inside 2 a of the sealed container 2 is made an N ₂ gas atmosphere. As the method, for example, the flow rate control valves of the gas supply pipe 4a and the discharge pipe 4b are opened, and the N ₂ gas 9a is supplied from the gas supply pipe 4a to the inside 2a of the sealed container 2. Thus, the inside 2a of the sealed container 2 is replaced with an N ₂ gas atmosphere, that is, an N ₂ gas atmosphere having a pressure equal to the atmospheric pressure is set.

  Further, the cooling liquid 11z adjusted to room temperature or the like is supplied to the cooling liquid flow path 11a of each pressing member 10 from the cooling liquid supply pipe 11b and circulated, thereby the seal portion of the outer peripheral portion 5x of each lid member 5 5z and each sealing member 8 are cooled. It is particularly desirable that the cooling temperature is 100 ° C. or lower in that the thermal deterioration of the seal member 8 can be reliably prevented and the sealing state of the mutual seal portions 3z and 5z can be reliably maintained well. Further, the temperature of each heating element 20 is adjusted to a predetermined brazing temperature. This brazing temperature is particularly preferably about 580 to 610 ° C.

  In this state, each heating element 20 is simultaneously moved by the driving force of each driver 25 so that the workpiece 30 is sandwiched between the heating elements 20 and 20 via the lid members 5 of the sealed container 2. Press. Then, the upper heating element 20 (more specifically, the heating surface 20a of the upper heating element 20) and the outer surface 5b of the upper lid member 5 are in close contact with each other, and the inner surface 5a of the upper lid member 5 and the upper surface of the work 30 are in surface contact. At the same time, the lower heating element 20 (more specifically, the heating surface 20a of the lower heating element 20) and the outer surface 5b of the lower lid member 5 are in close contact with each other and the inner surface 5a of the lower lid member 5 and the workpiece 30 are in close contact with each other. The lower surface of the contact is in close contact with the surface contact state. In this state, the heat of each heating element 20 is simultaneously transmitted from each heating element 20 to each workpiece 30 via each lid member 5 by conduction heat transfer, and the brazing scheduled portion 31 of the workpiece 30 is pressed in the contact direction. Is done. As a result, the temperature of the workpiece 30 rises from room temperature to a predetermined brazing temperature, and the brazing material (brazing material layer 32) is heated and melted. This process is called “melting process”.

  If the temperature of the work 30 is maintained at a predetermined brazing temperature for a predetermined time (for example, 0 to 10 minutes), then the temperature of each heating element 20 is decreased. Thereby, the heating of the brazing material is stopped. The heating of the brazing material may be stopped by moving each heating element 20 in the separating direction with respect to each lid member 5 by the driving force of each driver 25.

  When the temperature of the work 30 is lowered to a predetermined temperature (for example, 550 ° C.) or less and the brazing scheduled portion 31 of the work 30 is brazed with the brazing material, the heating elements 20 are moved away from the lid members 5 in the separating direction. While moving, for example, the upper pressing member 10 is moved in the separating direction with respect to the upper lid member 5 as at least one pressing member of the pressing members 10 and 10. Next, for example, the upper lid member 5 is opened with respect to the sealed container body 3 as at least one of the lid members 5 and 5. And the workpiece | work 30 is taken out from the inside 2a of the sealed container 2 (detailed sealed container main body 3). Thereby, the heat exchanger as a desired brazing product is obtained.

  The brazing device 1 and the brazing method of the first embodiment have the following advantages.

Since the heat of each heating element 20 as a heat source is transmitted to the work 30 by conductive heat transfer, the temperature of the work 30 is brazed more quickly than when heat from the heat source is transferred to the work 30 by radiant heat transfer or convective heat transfer. Rises to temperature. Therefore, it is possible to increase the heating rate of the workpiece 30. As a result, it is possible to shorten the time required for brazing (that is, brazing time), and further reduce the amount of heat required for brazing. Can be achieved. Furthermore, since the work 30 is disposed in the inside 2a of the sealed container 2, the inside 2a of the sealed container 2 can be made into an N ₂ gas atmosphere when the brazing material is melted (that is, during the melting step). The planned brazing portion 31 of the workpiece 30 can be satisfactorily brazed.

Further, since the inside 2a of the sealed container 2 is in an N ₂ gas atmosphere, the N ₂ gas pressure inside the sealed container 2 (internal pressure of the sealed container 2) is balanced with the pressure outside the sealed container 2 (atmospheric pressure). Can be made. Therefore, the thickness of each lid member 5 as the outer peripheral wall portion 6 of the sealed container 2 can be set thin. Thereby, the temperature increase rate of the workpiece 30 can be further increased. As a result, the time required for brazing can be further shortened, and the amount of heat required for brazing can be further increased. Reduction can be achieved.

  In addition, when the brazing material is melted (that is, in the melting step), each lid member 5 of the sealed container 2 is heated by the heat of each heating element 20 to thermally expand in a direction parallel to the outer surface 5b of each lid member 5. However, this thermal expansion is absorbed when the absorbing portion 7 of each lid member 5 contracts and deforms in a direction parallel to the outer surface 5 b of each lid member 5. Thereby, the deformation | transformation by the thermal expansion of each cover member 5 can be prevented. Therefore, when the brazing material is melted, the contact state between each heating element 20 and the outer surface 5b of each lid member 5 and the contact state between the inner surface 5a of each lid member 5 and the workpiece 30 can be satisfactorily maintained. On the other hand, when the melting step is completed and the temperature of each lid member 5 is lowered from the brazing temperature, each lid member 5 is thermally contracted in the direction parallel to the outer surface 5b. This thermal contraction is absorbed by each lid member 5. The portion 7 is absorbed (relaxed) by extending and deforming in a direction parallel to the outer surface 5 b of each lid member 5. As a result, the absorbing portion 7 of each lid member 5 returns to its original shape, and the overall shape and dimensions of each lid member 5 do not change before and after melting the brazing material. Therefore, the sealed container 2 (particularly each lid member 5) can be used repeatedly.

Further, since the sealed container 2 includes the sealed container main body 3 and each lid member 5, at least one of the work 30 is inserted into the inside 2 a of the sealed container 2 and the work 30 is taken out from the inside 2 a of the sealed container 2. By opening the lid member 5, the work 30 can be easily put in and out of the sealed container 2, and the sealed container 2 can be reliably and repeatedly used. Further, since the seal member 8 is interposed between the mutual seal portions 3z and 5z between the outer peripheral portion 5x of each lid member 5 and the sealed container body 3, the inside 2a of the sealed container 2 is reliably maintained in the N ₂ gas atmosphere. can do.

  In addition, since the seal portion 5z of the outer peripheral portion 5x of each lid member 5 is in a cooled state when the brazing material is melted, thermal deterioration of the seal member 8 can be prevented, and thus the mutual seal portion 3z. The seal state of 5z can be maintained well. Furthermore, since the seal part 5z of the outer peripheral part 5x of each lid member 5 is in a cooled state as described above, it is fixed by being pressed in a direction in close contact with the seal part 3z of the sealed container body 3. A large thermal expansion occurs in each lid member 5 due to a large temperature difference between the temperature of the outer peripheral portion 5x of each lid member 5 and the temperature of the contact portion 5c of each lid member 5 with the heating element 20. However, since the absorption part 7 is provided inside the seal part 5z of the outer peripheral part 5x of the lid member 5 and around the contact part 5c with the heating element 20, even with such a large thermal expansion, Absorption can be ensured by the absorber 7.

  Furthermore, since the absorption part 7 is formed by bending a part of the lid member 5 into a corrugated cross section, the thermal expansion can be reliably absorbed, and the absorption part 7 is formed by, for example, pressing. Thus, the absorption portion 7 can be easily formed.

  Furthermore, since the absorption part 7 is provided in the aspect surrounding the contact part 5c in the circumference | surroundings of the contact part 5c with the heat generating body 20 in the cover member 5, it can absorb a thermal expansion still more reliably.

  Furthermore, since the number of heating elements 20 is two and the heat of each heating element 20 is transmitted from each heating element 20 to the work 30 via each lid member 5, the number of heating elements 20 is one. Compared to the case where the workpiece placement position in the sealed container 2 is sandwiched between either one of the two outer sides, the temperature increase rate of the workpiece 30 can be further increased. The time required for attaching can be further shortened.

  Furthermore, since each heating element 20 is pressed against the work 30 via each lid member 5 of the sealed container 2 so as to sandwich the work 30 between the both heating elements 20, 20, when the brazing material is melted ( During the melting step), a brazing load can be applied to the planned brazing portion 31 of the work 30, whereby the brazing planned portion 31 of the work 30 can be brazed better.

  Furthermore, in the work placement step, the work 30 is placed in the inside 2a of the sealed container 2 so that the cavity 13 is formed between the mutual seal portions 3z, 5z in the inside 2a of the sealed container 2 and the work 30. The heat of the work 30 is not easily transmitted to the seal member 8, whereby the thermal deterioration of the seal member 8 can be further reliably prevented.

  Furthermore, in the brazing device 1 according to the first embodiment, the corrugated cross-section absorbing portion 7 is formed around the contact portion 5c of each lid member 5 of the sealed container 2 with each heating element 20, so that the workpiece Even when there is a gap between the inner surface 5a of each lid member 5 of the sealed container 2 and the work 30 in a state in which 30 is disposed in the inside 2a of the sealed container 2, each heating element 20 is interposed via each lid member 5. By pressing against the workpiece 30, the absorbing portion 7 of each lid member 5 is expanded and deformed, and the inner surface 5 a of each lid member 5 can be brought into close contact with the workpiece 30. Thereby, the heat of each heating element 20 can be reliably transmitted to the work 30. In addition, it is not necessary to use the sealed container 2 having an internal space that strictly corresponds to the size (thickness) of the workpiece 30, so that the application range of the sealed container 2 can be increased.

  Although the first embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

  For example, in the sealed container 2 of the first embodiment, as shown in FIG. 1, the absorbing section 7 having a corrugated cross section is configured so as to surround the contact portion 5 c with the heating element 20 in the lid member 5 and center the contact portion 5 c. In the present invention, the absorbing portion 7 does not necessarily extend continuously over the entire circumference in the circumferential direction centered on the contact portion 5c. It does not need to be provided. For example, in the present invention, as in the sealed container 2 of the second embodiment shown in FIG. 4, the absorbing portion 7 does not extend in the circumferential direction around the contact portion 5 c with the heating element 20 in the lid member 5. However, it may be partially divided, that is, there may be a portion 7 a where the absorbing portion 7 is not provided around the contact portion 5 c of the lid member 5 with the heating element 20.

  Furthermore, although not illustrated in the present invention, the absorbing portion 7 may be provided so as to surround the contact portion 5c of the lid member 5 with the heating element 20 in a substantially annular shape or a substantially spiral shape. .

  In the above embodiment, the brazing device 1 includes the upper heating element 20 and the lower heating element 20, but the brazing device 1 is not limited to this in the present invention. Only one of the heating elements 20 and 20 may be provided. If the brazing device 1 includes only the upper heating element 20, the work 30 is placed at the position where the lower heating element 20 is disposed instead of the lower heating element 20 via the lower lid member 5 of the sealed container 2. It is desirable that a receiving member for receiving from is disposed. In this way, when the brazing material is melted (that is, during the melting step), the upper heating element 20 is interposed via the upper lid member 5 of the sealed container 2 so that the workpiece 30 is sandwiched between the upper heating element 20 and the receiving member. Can be pressed against the workpiece 30. If the brazing device 1 includes only the lower heating element 20, a receiving member that receives the workpiece 30 from the upper side via the upper lid member 5 is arranged at the arrangement position of the upper heating element 20 instead of the upper heating element 20. It is desirable to be done. By doing so, the lower heating element 20 can be pressed against the workpiece 30 via the lower lid member 5 so that the workpiece 30 is sandwiched between the lower heating element 20 and the receiving member when the brazing material is melted. In any case, the receiving member is preferably made of ceramic (eg, alumina) or made of metal that can withstand the heat generated when the brazing material is melted, and particularly preferably has heat insulation. By doing so, the amount of heat loss flowing out from the receiving member when the brazing material is melted can be reduced.

  In the above embodiment, each heating element 20 is pressed against the workpiece 30 via each lid member 5 by the driving force of each driver 25. A configuration in which the one heating element 20 is pressed against the work 30 via the lid member 5 by moving toward one of them may be adopted.

  In the above embodiment, the temperature of the heating element 20 is adjusted in advance to a predetermined brazing temperature before the heating element 20 is pressed against the workpiece 30 via the lid member 5. After pressing to the work 30 through the lid member 5, the temperature of the heating element 20 may be adjusted to a predetermined brazing temperature.

  In the above embodiment, the sealed container 2 is used as the sealed body. However, the shape of the sealed body is not limited in the present invention. For example, the sealed container 2 may be a container shape as in the above embodiment. Alternatively, it may be a bag shape (that is, a sealed bag), and may be a square shape as in this embodiment, or a round shape or an oval shape.

  In the above embodiment, the number of lid members 5 is two. However, the present invention is not limited to this. For example, only one upper lid member 5 may be used. In this case, it is particularly desirable to configure the sealed container 2 so that the lower lid member 5 is integrally fixed to the sealed container body 3 (outer wall part 4) and functions as a thin plate-like bottom wall part of the sealed container 2.

  The present invention can be suitably used particularly as an inert gas atmosphere brazing apparatus and an inert gas atmosphere brazing method as a brazing apparatus and a brazing method.

1: Brazing device 2: Sealed container (sealed body)
3: Sealed container body 4: Outer wall (outer peripheral wall of the sealed container)
5: Lid member (outer peripheral wall of sealed container)
6: Outer peripheral wall portion 7 of the sealed container 7: Absorbing portion 8: Sealing member 10: Holding member 11: Cooling portion 20: Heating element 25: Driver 30: Workpiece 31: Planned brazing portion 32: Brazing material layer (brazing material)

Claims (12)

A workpiece having a brazing planned portion provided with a brazing material is disposed inside, and a sealed body in which the inside is brought to an inert gas atmosphere when the brazing material is melted,
A heating element disposed outside the sealing body;
Comprising
The heating element is in contact with the outer surface of the outer peripheral wall portion of the sealing body and the inner surface of the outer peripheral wall portion of the sealing body is in contact with the workpiece, and heat of the heating element is transferred from the heating element to the sealing body. The brazing filler metal is melted by conducting heat transfer to the workpiece through the outer peripheral wall portion of
An absorption portion for absorbing thermal expansion in a direction parallel to the outer surface of the outer peripheral wall portion generated when the brazing material is melted is provided around the contact portion of the outer peripheral wall portion of the sealing body with the heating element. An inert gas atmosphere brazing device characterized in that The sealing body includes a sealing body main body and a lid member corresponding to the sealing body main body and forming at least a part of the outer peripheral wall portion,
A sealing member is interposed between the outer sealing portion of the lid member and the sealing body main body,
When the brazing material is melted, the seal portion of the outer peripheral portion of the lid member is relatively pressed in a direction in which the seal portion is in close contact with the seal portion of the sealing body main body via the seal member in a cooled state. Is,
The contact portion with the heating element in the outer peripheral wall portion of the sealing body is located at a substantially central portion of the lid member,
The brazing device according to claim 1, wherein the absorbing portion is provided on the inner side of the seal portion of the outer peripheral portion of the lid member and around the contact portion with the heating element.   The brazing device according to claim 1 or 2, wherein the absorbing portion is formed by bending a part of the outer peripheral wall portion into a corrugated cross section.   The brazing device according to any one of claims 1 to 3, wherein the absorption portion is provided in a form surrounding the contact portion around the contact portion with the heating element in the outer peripheral wall portion. The heating elements are respectively arranged on both outer sides of the work arrangement position in the sealing body,
The heat of each said heat generating body shall be what fuse | melts the said brazing material by being transmitted to the said workpiece | work through the said outer peripheral wall part of the said sealing body from each said heat generating body. 4. The brazing apparatus according to any one of 4 above.   The brazing device according to claim 5, wherein each of the heating elements is relatively pressed against the workpiece via the outer peripheral wall portion of the sealing body so as to sandwich the workpiece between the two heating elements. A workpiece placement step of placing a workpiece having a brazing planned portion provided with a brazing material inside the sealed body;
After the workpiece placement step, the inside of the sealing body is brought to an inert gas atmosphere, and the heating element arranged outside the sealing body is brought into contact with the outer surface of the outer peripheral wall portion of the sealing body, and the sealing body Melting that melts the brazing material by transferring the heat of the heating element from the heating element to the workpiece through the sealing body by conductive heat transfer with the inner surface of the outer peripheral wall in contact with the workpiece. Process,
Including
In the melting step, thermal expansion in the direction parallel to the outer surface of the outer peripheral wall portion generated during the melting step is absorbed around the contact portion of the outer peripheral wall portion of the sealing body with the heating element. A brazing method characterized by absorbing by a part. The sealing body includes a sealing body main body and a lid member corresponding to the sealing body main body and forming at least a part of the outer peripheral wall portion,
A sealing member is interposed between the outer sealing portion of the lid member and the sealing body main body,
During the melting step, the seal portion of the outer peripheral portion of the lid member is relatively pressed in a direction in which the seal portion is in close contact with the seal portion of the sealing body main body through the seal member in a cooled state.
The contact portion with the heating element in the outer peripheral wall portion of the sealing body is located at a substantially central portion of the lid member,
The brazing method according to claim 7, wherein the absorbing portion is provided inside the seal portion on the outer peripheral portion of the lid member and around the contact portion with the heating element.   The brazing method according to claim 7 or 8, wherein the absorbing portion is formed by bending a part of the outer peripheral wall portion into a corrugated cross section.   The brazing method according to any one of claims 7 to 9, wherein the absorbing portion is provided around the contact portion with the heating element in the outer peripheral wall portion so as to surround the contact portion. The heating elements are respectively arranged on both outer sides of the work arrangement position in the sealing body,
The said melting process WHEREIN: The said brazing | wax material is fuse | melted by transferring the heat | fever of each said heat generating body to the said workpiece | work through the said outer peripheral wall part of the said sealing body from each said heat generating body. The brazing method according to any one of the above.   The brazing method according to claim 11, wherein in the melting step, the heating elements are relatively pressed against the work via the outer peripheral wall portion of the sealing body so as to sandwich the work between the two heating elements.

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