JP6062211B2 - Brazing method and brazing apparatus - Google Patents

Description

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

  Brazing methods used for manufacturing various products are roughly classified into flux brazing methods and fluxless brazing methods. A vacuum brazing method is generally known as a fluxless brazing method. 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 transferred to the workpiece by radiant heat transfer, and the brazing material is heated and melted. In the in-furnace brazing method and the Nocolok brazing method, the heat of the heat source is transferred to the work 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 of the present invention is to provide a brazing method improved from the conventional brazing method and a brazing apparatus suitably used for the brazing method.

  The present invention provides the following means.

[1] A work having a brazing planned portion provided with a brazing material is placed in a sealed body,
A brazing method comprising melting the brazing material by transferring heat of a heating element disposed outside the sealing body from the heating element to the workpiece through the sealing body by conductive heat transfer.

  [2] The brazing method according to item 1, wherein the brazing material is melted in a state where the inside of the sealing body is in a predetermined brazing atmosphere.

  [3] The heating element is brought into contact with the outer surface of the sealing body and the inner surface of the sealing body is brought into contact with the workpiece, and heat of the heating element is transferred from the heating element to the workpiece through the sealing body. 3. The brazing method according to 1 or 2 above, wherein the brazing method is conducted by conducting heat transfer.

  [4] The preceding items 1 to 3 wherein heat of the heating element is transmitted from the heating element to the work through the sealing body by conductive heat transfer by pressing the heating element relatively to the work through the sealing body. 4. The brazing method according to any one of 3 above.

  [5] The brazing method according to item 4 above, wherein the heating element is pressed relatively against the work through the sealing body so that the planned brazing portion of the work is pressurized.

[6] The heating elements are respectively arranged on both outer sides across the work arrangement position in the sealing body,
The brazing method according to any one of the preceding items 1 to 5, wherein the heat of each heating element is transferred from each heating element to the work through the sealing body by conductive heat transfer.

  [7] The heat of each heating element is sealed from the heating elements by pressing the heating elements relative to the work via the sealing body so as to sandwich the work between the heating elements. The brazing method according to the preceding item 6, wherein the work is simultaneously transmitted to the workpiece through a body by conductive heat transfer.

[8] The sealing body includes a sealing body main body and a lid member corresponding to the sealing body main body,
The brazing method according to any one of the preceding items 1 to 7, wherein a sealing member is interposed between the mutual sealing portions of the sealing body main body and the lid member.

  [9] The brazing method according to item 8, wherein the brazing material is melted in a state where at least one of the mutual seal portions is cooled.

  [10] The brazing method according to item 8 or 9, wherein the work is disposed in the sealed body so that a cavity is formed between the mutual seal portion and the work in the sealed body.

  [11] The brazing according to the above item 8 or 9, wherein a spacer for maintaining a distance between the mutual seal portion and the workpiece is disposed between the mutual seal portion and the workpiece in the sealed body so as to be removable. Method.

  [12] The brazing method according to item 11, wherein the spacer further maintains a shape of a contact portion with the spacer in the sealing body.

  [13] In the above items 8 to 12, the brazing material is melted in a state where the pressing member disposed outside the lid member is pressed against the outer surface of the lid member so that the mutual seal portions are in close contact with each other. The brazing method according to any one of the above.

  [14] The brazing method according to item 13, wherein the pressing member is relatively pressed against a corresponding portion of the seal portion on an outer surface of the lid member so that the mutual seal portions are in close contact with each other.

  [15] The brazing method according to item 13 or 14, wherein the pressing member is cooled.

[16] A sealing body in which a work having a brazing planned portion provided with a brazing material is disposed,
A heating element disposed outside the sealing body;
With
The brazing device is configured to melt the brazing material by transferring heat of the heating element from the heating element to the workpiece through the sealing body by conductive heat transfer.

  [17] The brazing device according to item 16 above, wherein the inside of the sealing body has a predetermined brazing atmosphere.

  [18] The heating element is in contact with the outer surface of the sealing body and the inner surface of the sealing body is in contact with the workpiece, and the heat of the heating element is transferred from the heating element to the workpiece through the sealing body. 18. The brazing device according to item 16 or 17 transmitted by conductive heat transfer.

  [19] The brazing device according to any one of [16] to [18], wherein the heating element is relatively pressed against the workpiece through the sealing body.

  [20] The brazing device according to item 19, wherein the heating element is pressed against the work through the sealing body so as to pressurize the part to be brazed of the work.

[21] The heating elements are respectively arranged on both outer sides of the work arrangement position in the sealing body,
21. The brazing device according to any one of the preceding items 16 to 20, wherein heat of each heating element is transmitted from each heating element to the workpiece through the sealing body by conductive heat transfer.

  [22] The brazing device according to item 21 above, wherein each of the heating elements is relatively pressed against the work via the sealing body so as to sandwich the work between the two heating elements.

[23] The sealing body includes a sealing body main body and a lid member corresponding to the sealing body main body,
23. The brazing device according to any one of the preceding items 16 to 22, wherein a seal member is interposed between the mutual seal portions of the sealing body main body and the lid member.

  [24] The brazing device according to item 23, wherein a cooling unit that cools at least one of the mutual seal units is provided.

  [25] The brazing device according to item 23 or 24, wherein a cavity is formed between the mutual seal portion and the workpiece in the sealed body.

[26] In addition, it further comprises a spacer disposed so as to be removable between the mutual seal portion and the workpiece in the sealed body,
25. The brazing device according to item 23 or 24, wherein the spacer maintains an interval between the mutual seal portion and the workpiece.

  [27] The brazing device according to [26], wherein the spacer further maintains a shape of a contact portion with the spacer in the sealing body.

[28] Furthermore, a pressing member disposed outside the lid member is provided,
The brazing device according to any one of the preceding items 23 to 27, wherein the pressing member is pressed against the outer surface of the lid member so that the mutual seal portions are in close contact with each other.

  [29] The brazing device according to item 28, wherein the pressing member is relatively pressed against a corresponding portion of the seal portion on an outer surface of the lid member so that the mutual seal portions are in close contact with each other.

  [30] The brazing device according to item 28 or 29, wherein a cooling unit for cooling the pressing member is provided.

  The present invention has the following effects.

  In the brazing method described in [1] above, the heat of the heating element as a heat source is transferred to the work by conduction heat transfer, so that the heat of the work is raised compared to the case where the heat of the heat source is transferred to the work by radiant heat transfer or convection heat transfer. The speed of the temperature can be increased, and as a result, the time required for brazing can be shortened, and further, the amount of heat required for brazing can be reduced. Furthermore, since the workpiece is disposed in the sealed body, the inside of the sealed body can be brought into a predetermined brazing atmosphere (eg, inert gas atmosphere, vacuum) during brazing, thereby brazing the workpiece. The planned portion can be brazed well.

  In the preceding item [2], since the brazing material is melted in a state where the inside of the sealing body is in a predetermined brazing atmosphere, the planned brazing portion of the workpiece can be brazed reliably and reliably.

  In the previous item [3], the heat of the heating element can be reliably transferred to the work by conduction heat transfer by bringing the heating element into contact with the outer surface of the sealing body and the inner surface of the sealing body in contact with the work. .

  In the previous item [4], the heating element is pressed against the workpiece through the sealing body, so that the heating element and the outer surface of the sealing body are in close contact with each other, and the inner surface of the sealing body and the workpiece are in close contact with each other. Heat can be more reliably transferred to the workpiece by conductive heat transfer.

  In the preceding item [5], a brazing load is applied to the planned brazing portion of the workpiece by pressing the heating element relative to the workpiece via the sealing body so that the planned brazing portion of the workpiece is pressurized. Thus, it is possible to satisfactorily braze the part to be brazed of the workpiece.

  In the preceding item [6], the heating elements are respectively disposed on both outer sides of the work arrangement position in the sealing body, and the heat of each heating element is transmitted from each heating element to the work through the sealing body, thereby generating the heating element. Compared to the case where the workpiece is placed only on one of the two outer sides across the workpiece placement position, the workpiece heating rate can be further increased. As a result, the brazing time can be reduced. Further shortening can be achieved.

  In the previous item [7], a brazing load can be applied to the part to be brazed by pressing each heating element relative to the work through the sealing body so that the work is sandwiched between the two heating elements. Thereby, it is possible to satisfactorily braze the part to be brazed of the workpiece.

  In the previous item [8], since the sealing body includes the sealing body main body and the lid member, the work piece to the sealing body is opened by opening the lid member when the work is put into the sealed body or when the work is taken out from the sealed body. Can be easily carried out and the sealing body can be used repeatedly. Furthermore, since the seal member is interposed between the mutual seal portions of the seal body body and the lid member, the inside of the seal body can be reliably maintained in a predetermined brazing atmosphere.

  In the above [9], it is possible to prevent thermal deterioration of the sealing member by melting the brazing material in a state where at least one of the mutual sealing portions is cooled, and as a result, the sealing state of the mutual sealing portions is good. Can be maintained.

  In the previous item [10], since a cavity is formed between the mutual seal portion and the workpiece in the sealed body, it becomes difficult for the heat of the workpiece to be transmitted to the seal member, thereby reliably preventing thermal deterioration of the seal member. it can.

  In the previous item [11], since a spacer is disposed between the mutual seal portion and the workpiece in the sealed body so as to maintain a distance between the mutual seal portion and the workpiece, the workpieces heated during brazing are mutually attached. Access to the seal portion can be prevented by the spacer. Therefore, it is possible to reliably prevent thermal degradation of the seal member. Furthermore, by positioning the spacer in the sealed body, the workpiece can be positioned in the sealed body.

  In the preceding item [12], the spacer further maintains the shape of the contact portion with the spacer in the sealing body, so that at least the sealing body even when the inside of the sealing body is evacuated during brazing. The shape of the contact portion with the spacer can be held by the spacer. Therefore, accidental deformation of the sealing body can be prevented during brazing.

  In the preceding item [13], the sealing state of the mutual seal portion is maintained well by melting the brazing material in a state where the pressing member is relatively pressed against the outer surface of the lid member so that the mutual seal portions are in close contact with each other. be able to.

  In the preceding item [14], the seal state of the mutual seal portion can be reliably maintained well.

  In the preceding item [15], since the pressing member is cooled, thermal deformation of the pressing member during brazing can be prevented, and the sealing member can be cooled by the pressing member.

  The brazing apparatus of the preceding items [16] to [30] can be suitably used for the brazing method of the preceding items [1] to [15], respectively.

FIG. 1 is a plan view showing a brazing apparatus according to a first embodiment of the present invention in a state when a planned brazing portion of a workpiece is brazed. FIG. 2 is a cross-sectional view taken along line XX in FIG. 3 is a cross-sectional view taken along line YY in FIG. FIG. 4 is a perspective view of a cross section taken along line XX in FIG. FIG. 5 is a perspective view of a cross section taken along line YY in FIG. FIG. 6 is an exploded cross-sectional view of the brazing apparatus taken along line XX in FIG. FIG. 7 is an exploded cross-sectional view of the brazing device taken along line YY in FIG. FIG. 8 is an exploded cross-sectional view centering on the mutual seal portion between the sealed container body and the lid member in the sealed container (sealed body) of the brazing apparatus. FIG. 9 is a plan view showing the brazing apparatus according to the second embodiment of the present invention in a state where the part to be brazed of the workpiece is brazed. 10 is a cross-sectional view taken along line XX in FIG. 11 is a cross-sectional view taken along line YY in FIG.

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

  FIGS. 1-8 is a figure explaining the brazing apparatus and brazing method which concern on 1st Embodiment of this invention.

  As shown in FIGS. 1 to 5, the brazing device 1 of the first embodiment includes a sealed container 2 as a sealed body, a pressing member 10, and two heating elements 20 </ b> A and 20 </ b> B. .

  A workpiece 30 is accommodated in 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 33 and 33 that are brazed and integrated with each other. The brazed member 33 is made of, for example, a plate-like metal, and is made of aluminum (including an alloy thereof, the same applies hereinafter) in the first embodiment. The number of brazed members 33 is two, for example. And both the brazing members 33 and 33 are mutually assembled | attached, for example in the shape of superposition | polymerization up and down. Further, a brazing material (indicated by dot hatching) 32 is interposed between the superposed interfaces (that is, the planned joining interfaces) of the brazed members 33 and 33 as the planned brazing portions 31. The brazing material 32 is, for example, in the form of a sheet, and the main brazing component is an Al—Si based alloy, an Al—Si—Mg based alloy, or the like. The brazing material 32 may be clad in advance on at least one of the brazed members 33, that is, at least one of the brazed members 33 and 33 may be formed of a brazing sheet. Further, the type of the brazing material 32 is not limited. For example, the brazing material 32 may be flux-containing or flux-less.

The sealed container 2 is to keep the inside in a predetermined brazing atmosphere. Specifically, the inside of the sealed container 2 is, for example, an inert gas atmosphere or a vacuum as a predetermined brazing atmosphere. As the inert gas, N ₂ gas or the like is used. When the inside of the sealed container 2 is evacuated, the degree of vacuum is set, for example, to 1 × 10 ⁻³ to 1 × 10 ⁻⁴ Pa. Further, the sealed container 2 is held at a predetermined height position by a holding member (not shown).

  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 100 to 500 mm, the length is set to 300 to 1000 mm, and the height (thickness) is set to 10 to 150 mm.

  As shown in FIGS. 6 and 7, the sealed container 2 includes a sealed container body 3 as a sealed body and a plate-like lid member 7 that can be opened and closed with respect to the sealed container body 3. Both the sealed container body 3 and the lid member 7 are made of metal that can withstand the heat during brazing, and are made of, for example, stainless steel such as SUS304.

  The sealed container body 3 includes a bottom wall portion 4 and a side wall portion 5 and has an upper surface opened. The shape of the bottom wall portion 4 is a plate shape having a substantially rectangular shape in a plan view, and more specifically, a plate shape having a rectangular shape or a square shape in a plan view. The side wall portion 5 has a substantially rectangular frame shape in plan view, and is airtightly joined to the outer peripheral edge portion of the inner surface 4a of the bottom wall portion 4 by welding or the like. Further, the side wall portion 5 is formed of a hollow material having a square cross section, and a coolant flow path 6 a extending in the circumferential direction of the side wall portion 5 is formed therein. Details of this configuration will be described later.

  The lid member 7 closes the opening of the upper surface of the sealed container body 3 so as to be openable and closable, and is arranged to face the bottom wall portion 4. The shape of the lid member 7 is a substantially rectangular plate shape in plan view as in the shape of the bottom wall portion 4. More specifically, the lid member 7 has a rectangular shape or square plate shape in plan view.

  In the sealed container 2, as shown in FIG. 8, the seal portion 3 z with the lid member 7 of the sealed container body 3 is formed from the upper surface of the side wall portion 5 of the sealed container body 3. The sealing part 7 z of the lid member 7 with the sealed container body 3 is composed of the outer peripheral edge part of the inner surface 7 a of the lid member 7.

  A groove 5a is formed in the seal portion 3z with the lid member 7 of the sealed container body 3, and the seal member 8 is disposed in the groove 5a. When the lid member 7 is closed with respect to the sealed container body 3, the seal member 8 is interposed between the mutual seal portions 3z and 7z of the sealed container body 3 and the lid member 7 as shown in FIGS. Is done.

  In the first embodiment, the seal member 8 is an annular rubber gasket (including packing) having a substantially square shape in plan view as shown in FIG. Further, the seal member 8 has a circular cross section as shown in FIG. In the present invention, the seal member 8 is not limited to a rubber member, but may be a metal member (eg, metal gasket).

  The pressing member 10 has a substantially rectangular frame shape in plan view, and is disposed outside the lid member 7. The pressing member 10 is made of a metal that can withstand heat during brazing, and is made of stainless steel such as SUS304. Further, the pressing member 10 is pressed against the corresponding portion 7c of the seal portion 7z on the outer surface 7b of the lid member 7 so that the mutual seal portions 3z and 7z of the sealed container body 3 and the lid member 7 are in close contact with each other ( (See FIG. 8). Further, the pressing member 10 is formed of 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. Details of this configuration will be described later.

  The two heating elements 20A and 20B are arranged one by one on both the upper and lower sides across the work arrangement position in the sealed container 2. When brazing, the heat of each heating element 20A, 20B is such that each heating element 20A, 20B is in contact with the outer surface of the sealed container 2 and the inner surface of the sealed container 2 is in contact with the workpiece 30. The brazing material 32 is heated and melted simultaneously by conduction heat transfer from the heating elements 20A and 20B to the work 30 through the sealed container 2. Each heating element 20A, 20B is composed of a heating head of an electric heater, for example. Conductive heat transfer is also called heat conduction.

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

  The heating surface (heating surface) 20Aa of the upper heating element 20A is formed in a shape that can come into contact with the outer surface 7b of the lid member 7 in a surface contact state, specifically, for example, in a flat shape. Further, the heating surface 20Aa is formed in a size that can cover the upper surface of the workpiece 30 (see FIG. 1). Similarly, the heating surface (heating surface) 20Ba of the lower heating element 20B is formed in a shape that can contact the outer surface 4b of the bottom wall portion 4 in a surface contact state, and specifically, for example, is formed in a flat shape. Yes. Further, the heating surface 20Ba is formed in a size that can cover the lower surface of the workpiece 30.

  Further, the brazing device 1 includes a driver that presses at least one of the upper and lower heating elements 20 </ b> A and 20 </ b> B against the workpiece 30 through the sealed container 2. In the first embodiment, the brazing device 1 includes an upper driver 25 </ b> A and a lower driver 25 </ b> B as two drivers that press both the heating elements 20 </ b> A and 20 </ b> B against the workpiece 30 via the sealed container 2. . The upper driver 25 </ b> A presses the upper heating element 20 </ b> A against the workpiece 30 from above via the lid member 7 of the sealed container 2. The lower driver 25 </ b> B presses the lower heating element 20 </ b> B against the work 30 from the lower side through the bottom wall portion 4 of the sealed container 2. Then, both the heating elements 20A and 20B are moved between the heating elements 20A and 20B on the work 30 via the sealed container 2 (in detail, the lid member 7 or the bottom wall portion 4) by the driving force of the drivers 25A and 25B. Thus, the workpiece 30 is configured to be pressed at the same time so as to be sandwiched from both the upper and lower sides. Each of the drivers 25A and 25B can control a driving operation such as a driving speed, a driving amount, and a driving force. As each driver 25A, 25B, a fluid pressure (example: oil pressure, gas pressure) type drive cylinder, an electric drive motor, or the like is used.

  In the sealed container 2, the thickness of the side wall part 5 is not limited, and is set to 3 to 10 mm, for example. Furthermore, the thickness of the peripheral wall surrounding the coolant flow path 6a in the side wall portion 5 is not limited, but is preferably set to 3 to 8 mm.

  In the first embodiment, the bottom wall portion 4 and the lid member 7 correspond to a contact portion with the workpiece 30 in the sealed container 2. Although the thickness of the bottom wall part 4 and the cover member 7 is not limited, It is desirable to set according to the brazing atmosphere inside the sealed container 2. Specifically, the desirable thicknesses of the bottom wall portion 4 and the lid member 7 are as follows.

  When the inside of the sealed container 2 is evacuated during brazing, the bottom wall 4 and the lid member 7 are made strong enough to maintain the inside of the sealed container 2 in a vacuum state. The thickness of the lid member 7 is preferably set to 3 mm or more. On the other hand, as the thickness of the bottom wall portion 4 and the lid member 7 increases, the amount of heat transferred from each of the heating elements 20A and 20B to the workpiece 30 decreases, so that the thickness of the bottom wall portion 4 and the lid member 7 is as much as possible. The thinner one is desirable, and it is particularly desirable to set it to 5 mm or less. Therefore, it is particularly desirable that the thickness of the bottom wall portion 4 and the lid member 7 as the contact portion with the workpiece 30 in the sealed container 2 is set in the range of 3 to 5 mm.

  When the inside of the sealed container 2 is changed to a brazing atmosphere gas (eg, inert gas) during brazing, it is not necessary to set the thickness of the bottom wall portion 4 and the lid member 7 to be thick, that is, thin. It can be set, and is particularly preferably set to 0.1 to 3 mm.

  As shown in FIGS. 2 to 5, in a state where the work 30 is disposed in the sealed container 2, a substantially rectangular shape in a plan view is formed between the mutual seal portions 3 z and 7 z and the work 30 in the sealed container 2. A cavity 9 is formed over the entire inner circumference of the mutual seal portions 3z and 7z.

  Further, as shown in FIGS. 1, 2 and 4, the sealed container 2 has a supply pipe for supplying a brazing atmosphere gas into the sealed container 2 as means for bringing the inside of the sealed container 2 into a predetermined brazing atmosphere. At least one of 5b and a suction pipe 5c that sucks the gas in the sealed container 2 in order to make the inside of the sealed container 2 vacuum is connected. As shown in FIG. 2, the supply pipe 5 b and the suction pipe 5 c penetrate the side wall 5 from the outside of the sealed container 2, and their tip ends (that is, the supply port of the supply pipe 5 b and the suction port of the suction pipe 5 c). It is arranged in the sealed container 2.

Further, the sealed container 2 is provided with a seal portion 3z with the lid member 7 of the sealed container body 3 as a cooling portion for cooling at least one of the mutual seal portions 3z and 7z between the sealed container body 3 and the lid member 7. A first cooling unit 6 for cooling is provided. The first cooling section 6 has the cooling liquid flow path 6a formed inside the side wall section 5 and a cooling liquid (for example, cooling water) flows through the cooling liquid flow path 6a so that the sealed container body. The sealing portion 3z with the three lid members 7 is cooled. Further, as shown in FIG. 1, the side wall 5 of the sealed container body 3 has a supply pipe 6b for supplying the coolant to the coolant channel 6a from the outside, and the coolant is discharged from the coolant channel 6a to the outside. Are connected to the discharge pipe 6c.

  The pressing member 10 is provided with a second cooling unit 11 that cools the pressing member 10. The second cooling unit 11 has the cooling liquid channel 11a formed inside the pressing member 10, and the cooling member (for example, cooling liquid) flows through the cooling liquid channel 11a so that the pressing member 10 is circulated. It is supposed to cool. Furthermore, as shown in FIG. 1, the holding member 10 includes a supply pipe 11b for supplying a cooling liquid to the cooling liquid flow path 11a from the outside, and a discharge pipe 11c for discharging the cooling liquid from the cooling liquid flow path 11a to the outside. Are connected to each other.

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

  As shown in FIGS. 6 and 7, first, a work 30 composed of a plurality of brazed members 33, 33 assembled in advance in a predetermined shape is prepared. As described above, in the first embodiment, the material of the brazed member 33 is, for example, aluminum, and the number thereof is, for example, two. The two brazed members 33, 33 are assembled with each other in a superposed manner, for example. Further, a brazing material 32 is interposed between the brazing planned portions 31 (scheduled joining interface) for brazing and integrating the brazed members 33 and 33 together. Further, the work 30 is pre-treated for brazing (for example, degreasing and alkali cleaning treatment) in advance according to a conventional method.

  Next, the lid member 7 is opened with respect to the sealed container body 3. And the workpiece | work 30 is arrange | positioned on the substantially center part of the inner surface 4a of the bottom wall part 4 in the sealed container main body 3 (it puts in detail). Thereby, the inner surface 4a of the bottom wall part 4 and the lower surface of the workpiece | work 30 contact a surface contact state. Next, the lid member 7 is disposed in a closed state with respect to the sealed container body 3, and the pressing member 10 is pressed against the corresponding portion 7c of the seal portion 7z on the outer surface 7b of the lid member 7 (see FIG. 8). Thereby, the mutual seal portions 3z and 7z of the sealed container body 3 and the lid member 7 are brought into close contact with each other. As a result, the seal member 8 is interposed between the mutual seal portions 3z and 7z, and the substantially central portion of the inner surface 7a of the lid member 7 and the upper surface of the work 30 are in contact with each other. Further, a hollow 9 having a substantially rectangular shape in plan view is formed between the mutual seal portions 3z and 7z and the work 30 in the sealed container 2 over the entire inner circumference of the mutual seal portions 3z and 7z.

Then, the inside of the sealed container 2 is set to a predetermined brazing atmosphere. For example, when the brazing material 32 is a non-corrosive fluoride-based flux-cored brazing material and an N ₂ gas atmosphere is applied as a brazing atmosphere, that is, when Nocolok brazing conditions are applied, the sealed container 2 is filled with the brazing material 32. N ₂ gas is supplied from the N ₂ gas supply source (eg, N ₂ gas cylinder) through the supply pipe 5b, and thereby the inside of the sealed container 2 is made an N ₂ gas atmosphere. When the brazing material 32 is a fluxless brazing material and a vacuum is applied as a brazing atmosphere, that is, when vacuum brazing conditions are applied, a gas such as air in the sealed container 2 is vacuum pumped (not shown). Is sucked through the suction tube 5c, and the inside of the sealed container 2 is evacuated.

  Further, a coolant adjusted to room temperature or the like is circulated through the coolant flow path 6a of the side wall portion 5 of the sealed container 2, thereby cooling the seal portion 3z with the lid member 7 of the sealed container body 3. Further, a coolant adjusted to room temperature or the like is circulated through the coolant flow path 11a of the pressing member 10, thereby cooling the pressing member 10 and at the same time the sealing member with the sealed container body 3 of the lid member 7 by the pressing member 10. Cool 7z. Further, the temperature of the upper and lower heating elements 20A and 20B is adjusted to a predetermined brazing temperature (for example, about 580 to 610 ° C.).

  In this state, the heating elements 20A and 20B are simultaneously pressed against the work 30 via the sealed container 2 so that the work 30 is sandwiched between the heating elements 20A and 20B by the driving force of the respective drivers 25A and 25B. . As a result, the heating surface 20Aa of the upper heating element 20A and the outer surface 7b of the lid member 7 of the sealed container 2 are in close contact with each other, and the inner surface 7a of the lid member 7 and the upper surface of the work 30 are in close contact with each other. The heating surface 20Ba of the lower heating element 20B and the outer surface 4b of the bottom wall 4 of the sealed container 2 are in close contact with each other, and the inner surface 4a of the bottom wall 4 and the lower surface of the work 30 are in close contact with each other. . In this state, the heat of each heating element 20A, 20B is simultaneously transferred from each heating element 20A, 20B to the work 30 via the sealed container 2 (more specifically, the lid member 7 and the bottom wall 4) by conduction heat transfer. At the same time, the planned brazing portion 31 of the work 30 is pressed in the contact direction. As a result, the temperature of the workpiece 30 rises from room temperature to a predetermined brazing temperature, and the brazing material 32 is heated and melted.

  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 temperatures of the heating elements 20A and 20B are lowered. Thereby, the heating of the brazing material 32 is stopped. The heating of the brazing material 32 may be stopped by moving the heating elements 20A and 20B in the separating direction with respect to the sealed container 2 by the driving force of the respective drivers 25A and 25B.

  When the temperature of the work 30 is lowered to a predetermined temperature (for example, 550 ° C.) or less and the brazing planned portion 31 of the work 30 is brazed with the brazing material 32, the lid member 7 is then opened with respect to the sealed container body 3. . Next, the workpiece 30 is taken out from the sealed container 2 (more specifically, the sealed container body 3). This gives the desired brazed product. In addition, when the inside of the sealed container 2 is a vacuum, before opening the cover member 7, a predetermined gas is supplied into the sealed container 2 to return the inside of the sealed container 2 to atmospheric pressure.

  The brazing method of the first embodiment has the following advantages.

Since the heat of each heating element 20A, 20B is transferred to the work 30 by conductive heat transfer, the temperature of the work 30 is rapidly increased compared to the case where the heat of the heat source is transferred to the work 30 by radiant heat transfer or convective heat transfer. To rise. Therefore, it is possible to increase the speed of Atsushi Nobori rate of the workpiece 30, the result of that, to be able to shorten the brazing time, further, it is possible to reduce the amount of heat required for brazing. Furthermore, since the work 30 is disposed in the sealed container 2, the inside of the sealed container 2 can be brought into a predetermined brazing atmosphere during brazing, and thus the brazing planned portion 31 of the work 30 is excellent. Can be brazed.

  Furthermore, since the brazing material 32 is melted in a state where the inside of the sealed container 2 is in a predetermined brazing atmosphere, the planned brazing portion 31 of the work 30 can be brazed reliably and reliably.

  Furthermore, the heating elements 20A and 20B are brought into contact with the outer surface of the sealed container 2 and the inner surface of the sealed container 2 is brought into contact with the workpiece 30, whereby the heat of the heating elements 20A and 20b is transferred to the workpiece by conduction heat transfer. 30 can be surely communicated.

  Furthermore, since the number of heating elements is two and the heat of each heating element 20A, 20B is transferred from each heating element 20A, 20B to the work 30 through the sealed container 2, the number of heating elements is one. Compared to the case where the workpiece 30 is arranged only on one side of both sides of the sealed container 2 with the workpiece placement position interposed therebetween, the heating rate of the workpiece 30 can be further increased. As a result, the brazing time can be further shortened.

  Further, the heating elements 20A and 20B are pressed against the work 30 via the sealed container 2 so that the work 30 is sandwiched between the heating elements 20A and 20B, thereby applying a brazing load to the brazing scheduled portion 31 of the work 30. As a result, the planned brazing portion 31 of the workpiece 30 can be brazed well.

  Furthermore, since the sealed container 2 includes the sealed container body 3 and the lid member 7, the lid member 7 is opened when the work 30 is put into the sealed container 2 or when the work 30 is taken out from the sealed container 2. Thus, the work 30 can be easily put in and out of the sealed container 2, and the sealed container 2 can be used repeatedly. Further, since the seal member 8 is interposed between the mutual seal portions 3z and 7z of the sealed container body 3 and the lid member 7, the inside of the sealed container 2 can be reliably maintained in a predetermined brazing atmosphere.

  Furthermore, since the brazing filler metal 32 is melted in a state where the seal portion 3z with the lid member 7 of the sealed container body 3 is cooled by the first cooling portion 6, thermal deterioration of the seal member 8 can be prevented. As a result, the sealing state of the mutual seal portions 3z and 7z can be favorably maintained.

  Furthermore, since the work 30 is disposed in the sealed container 2 so that the cavity 9 is formed between the mutual seal portions 3z and 7z and the work 30 in the sealed container 2, the heat of the work 30 is applied to the seal member 8. As a result, the heat deterioration of the seal member 8 can be reliably prevented.

  Furthermore, by pressing the pressing member 10 against the corresponding portion 7c of the seal portion 7z on the outer surface 7b of the lid member 7 so that the mutual seal portions 3z and 7z are in close contact with each other, the sealing state of the mutual seal portions 3z and 7z is surely good. Can be maintained.

  Furthermore, since the pressing member 10 is cooled by the second cooling unit 11, thermal deformation of the pressing member 10 during brazing can be prevented, and further, the sealing member 8 can be cooled by the pressing member 10. Therefore, the thermal deterioration of the seal member 8 can be further reliably prevented, and as a result, the sealed state of the mutual seal portions 3z and 7z can be more reliably maintained better.

  Further, in the first embodiment, at least the contact portion of the sealed container 2 (detailed lid member 7) with the upper heating element 20A and its vicinity, and at least the lower portion of the sealed container 2 (detailed bottom wall portion 4). It is desirable that at least one of the contact portion with the heating element 20 </ b> B and its vicinity can be deformed following the pressing operation of the heating element to the work 30. As a method of configuring the sealed container 2 in this way, the thickness of the lid member 7 and the bottom wall portion 4 of the sealed container 2 is set to be thin, or the shape of the lid member 7 and the bottom wall portion 4 is changed to the work 30 of the heating element. For example, the shape may be set to be elastically or plastically deformable following the pressing operation. By doing so, the workpiece 30 is disposed between the inner surface of the sealed container 2 (more specifically, the inner surface 4a of the bottom wall portion 4 and the inner surface 7a of the lid member 7) and the workpiece 30 in a state where the workpiece 30 is disposed in the sealed container 2. Even when there is a gap, the work 30 is brought into close contact with the inner surface (the inner surface 4a of the bottom wall 4 or the inner surface 7a of the lid member 7) of the sealed container 30 by pressing the heating element against the work 30 via the sealed container 2. Can do. Furthermore, even when the size of the work 30 changes slightly during brazing, the close contact state between the inner surface of the sealed container 2 and the work 30 can be maintained. Thereby, the heat of the heating element can be reliably transmitted to the workpiece 30. In addition, it is not necessary to use the sealed container 2 having an internal space corresponding to the size of the workpiece 30, and therefore the application range of the sealed container 2 can be increased.

  FIGS. 9-11 is a figure explaining the brazing apparatus and brazing method which concern on 2nd Embodiment of this invention. In these drawings, the same reference numerals are given to components that are the same as or correspond to those of the brazing device of the first embodiment. The brazing apparatus and brazing method of the second embodiment will be described below with a focus on differences from the first embodiment.

  The brazing apparatus 1 of the second embodiment further includes a spacer 15 in addition to the brazing apparatus of the first embodiment. The spacer 15 has a substantially rectangular frame shape in plan view, and is made of ceramic (eg, alumina) or metal that can withstand heat during brazing. As shown in FIGS. 10 and 11, the spacer 15 has a mutual seal portion 3 z between the sealed container body 3 and the lid member 7 in the sealed container 2 before or after the work 30 is arranged in the sealed container 2. By being arranged between 7z and the workpiece 30, the distance between the mutual seal portions 3z, 7z and the workpiece 30 is maintained. Furthermore, in the state in which the spacer 15 is arranged in this way, the spacer 15 is in contact with the inner surface 4a of the bottom wall portion 4 of the sealed container 2 and the inner surface 7a of the lid member 7 in a surface contact state. The spacer 15 holds the shape of the contact portion with the spacer 15 in the sealed container 2. Further, the spacer 15 is disposed in the sealed container 2 so as to be removable from the sealed container 2.

  The brazing method using the brazing apparatus 1 of the second embodiment is performed in the same manner as in the first embodiment.

  According to the brazing method of the second embodiment, the spacer 15 that keeps the distance between the mutual seal portions 3z, 7z and the workpiece 30 between the mutual seal portions 3z, 7z and the workpiece 30 in the sealed container 2. Therefore, the spacer 15 can prevent the workpiece 30 heated during brazing from approaching the mutual seal portions 3z and 7z. Therefore, the thermal deterioration of the seal member 8 can be more reliably prevented. Furthermore, by positioning the spacer 15 in the sealed container 2, the workpiece 30 can be positioned in the sealed container 2.

  Furthermore, since the spacer 15 maintains the shape of the contact portion with the spacer 15 in the sealed container 2, at least the contact portion with the spacer 15 in the sealed container 2 even when the inside of the sealed container 2 is evacuated. Can be held by the spacer 15. Therefore, inadvertent deformation of the sealed container 2 can be prevented during brazing.

  In the second embodiment, the spacer 15 is solid. However, in the present invention, the spacer 15 is not limited to this, and may be hollow, for example.

  Furthermore, in the second embodiment, the shape of the spacer 15 is a substantially rectangular frame shape in plan view, but in the present invention, the shape of the spacer 15 is not limited to this, and the shape of the work 30 and the shape of the sealed container 2 are not limited thereto. Various changes are made depending on the shape and the like.

  As mentioned above, although some embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not change the summary of this invention, it can change variously.

In the above embodiment, the brazing device 1 includes the upper heating element 20A and the lower heating element 20B. However, the brazing device 1 is not limited to this in the present invention. 20B may be provided with only one or have deviated out of. If the brazing device 1 includes only the upper heating element 20A, a receiving member for receiving the workpiece 30 from the lower side via the sealed container 2 at the position where the lower heating element 20B is disposed instead of the lower heating element 20B. It is desirable to be placed. By doing so, the upper heating element 20A can be pressed against the workpiece 30 via the sealed container 2 so that the workpiece 30 is sandwiched between the upper heating element 20A and the receiving member during brazing. If the brazing device 1 includes only the lower heating element 20B, a receiving member that receives the workpiece 30 from the upper side via the sealed container 2 is arranged at the arrangement position of the upper heating element 20A instead of the upper heating element 20A. It is desirable to be done. By doing so, the lower heating element 20B can be pressed against the workpiece 30 via the sealed container 2 so that the workpiece 30 is sandwiched between the lower heating element 20B and the receiving member during brazing. In any case, the receiving member is preferably made of ceramic (eg, alumina) and made of metal capable of withstanding heat during brazing, and particularly preferably has heat insulation properties. As a result, the amount of heat loss flowing out from the receiving member during brazing can be reduced.

  In the above embodiment, the heating elements 20A, 20B are pressed against the work 30 via the sealed container 2 by the driving force of the drivers 25A, 25B. However, the present invention is not limited to the sealed container 2 of the both heating elements 20A, 20B. You may employ | adopt the structure by which a heat generating body is pressed against the workpiece | work 30 via the sealed container 2 by moving toward either one.

  In the above embodiment, the temperature of the heating element is adjusted to a predetermined brazing temperature in advance before the heating element is pressed against the workpiece 30 via the sealed container 2. Then, the temperature of the heating element may be adjusted to a predetermined brazing temperature after being pressed against the workpiece 30.

  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, or 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.

  Moreover, in the said embodiment, although the sealing part 3z with the lid member 7 of the sealed container main body 3 is cooled by the 1st cooling part 6 among the mutual seal parts 3z and 7z of the sealed container main body 3 and the lid member 7, In the present invention, the sealing portion 7z of the lid member 7 with the sealed container body 3 may be cooled, or both the mutual sealing portions 3z and 7z may be cooled. good.

  The present invention is applicable to a brazing method and a brazing apparatus.

1: Brazing device 2: Sealed container (sealed body)
3: Sealed container body (sealed body body)
3z: Sealing part of the sealed container body with the lid member 4: Bottom wall part 5: Side wall part 6: First cooling part 6a: Coolant flow path 7: Lid member 7z: Sealing part 8 of the lid member with the sealed container body : Seal member 9: Cavity 10: Pressing member 11: Second cooling part 11 a: Coolant flow path 15: Spacer 20 A: Upper heating element 20 B: Lower heating element 25 A: Upper driver 25 B: Lower driver 30: Work 31: Brazing scheduled part 32: brazing material 33: brazed member

Claims (28)

A work having a brazing planned part provided with a brazing material is placed in a sealed body,
A heating element as a heat source disposed outside the sealing body is brought into contact with an outer surface of the sealing body and an inner surface of the sealing body is brought into contact with the workpiece, and heat of the heating element is transferred from the heating element. by transferring by conduction heat transfer to the workpiece through the seal, brazing how to melt the brazing material. By pressing relatively the work of the heating element through the seal, wax of claim 1, wherein transferring heat of the heating element by conduction heat transfer to the workpiece through the seal from the heating element Attaching method. The brazing method according to claim 2 , wherein the heating element is pressed relatively to the work through the sealing body so that the portion to be brazed of the work is pressurized. The heating elements are respectively arranged on both outer sides of the work arrangement position in the sealing body,
The brazing method according to any one of claims 1 to 3 , wherein the heat of each heating element is transferred from each heating element to the workpiece through the sealing body by conductive heat transfer. By relatively pressing each heating element against the work via the sealing body so as to sandwich the work between the two heating elements, the heat of each heating element is transferred from each heating element via the sealing body. The brazing method according to claim 4, wherein the workpiece is simultaneously transmitted to the workpiece by conductive heat transfer. The sealing body includes a sealing body main body and a lid member corresponding to the sealing body main body,
The brazing method according to any one of claims 1 to 5 , wherein a seal member is interposed between mutual seal portions of the sealing body main body and the lid member. The brazing method according to claim 6 , wherein the brazing material is melted in a state where at least one of the mutual seal portions is cooled. The brazing method according to claim 6 or 7 , wherein the work is disposed in the sealed body so that a cavity is formed between the mutual seal portion and the work in the sealed body. The brazing method according to claim 6 or 7 , wherein a spacer for maintaining a distance between the mutual seal portion and the workpiece is disposed between the mutual seal portion and the workpiece in the sealed body so as to be removable. The brazing method according to claim 9 , wherein the spacer further maintains a shape of a contact portion with the spacer in the sealing body. In a state in which the placed pressing member outside of the cover member the cross seal portions pressed relatively to the outer surface of the lid member so as to contact any of claims 6-10 for melting the brazing material The brazing method described in 1. The brazing method according to claim 11, wherein the pressing member is relatively pressed against a corresponding portion of the seal portion on an outer surface of the lid member so that the mutual seal portions are in close contact with each other. The brazing method according to claim 11 or 12, wherein the pressing member is cooled. The brazing method according to any one of claims 1 to 13 , wherein the brazing material is melted in a state where the inside of the sealing body is in a predetermined brazing atmosphere. A sealed body in which a workpiece having a brazing planned portion provided with a brazing material is disposed;
A heating element as a heat source disposed outside the sealing body;
With
The heating element is in contact with the outer surface of the sealing body and the inner surface of the sealing body is in contact with the workpiece, and the heat of the heating element is transferred from the heating element to the workpiece through the sealing body. brazing apparatus by reportedly that have been made as to melt the brazing material by. The brazing device according to claim 15 , wherein the heating element is relatively pressed against the workpiece through the sealing body. The brazing device according to claim 16 , wherein the heating element is pressed against the workpiece through the sealing body so as to pressurize the portion to be brazed of the workpiece. The heating elements are respectively arranged on both outer sides of the work arrangement position in the sealing body,
The brazing device according to any one of claims 15 to 17 , wherein heat of each heating element is transmitted from each heating element to the workpiece through the sealing body by conductive heat transfer. The brazing device according to claim 18 , wherein each of the heating elements is relatively pressed against the work via the sealing body so as to sandwich the work between the two heating elements. The sealing body includes a sealing body main body and a lid member corresponding to the sealing body main body,
The brazing apparatus according to any one of claims 15 to 19 , wherein a sealing member is interposed between the mutual sealing portions of the sealing body main body and the lid member. 21. The brazing device according to claim 20, further comprising a cooling portion that cools at least one of the mutual seal portions. The brazing apparatus according to claim 20 or 21 , wherein a cavity is formed between the mutual seal portion and the workpiece in the sealed body. Furthermore, it is provided with a spacer disposed so as to be removable between the mutual seal part and the workpiece in the sealed body,
The brazing device according to claim 20 or 21 , wherein the spacer maintains an interval between the mutual seal portion and the workpiece. The brazing device according to claim 23 , wherein the spacer further maintains a shape of a contact portion with the spacer in the sealing body. Furthermore, a holding member disposed outside the lid member is provided,
The brazing device according to any one of claims 20 to 24 , wherein the pressing member is relatively pressed against an outer surface of the lid member so that the mutual seal portions are in close contact with each other. 26. The brazing device according to claim 25 , wherein the pressing member is relatively pressed against a corresponding portion of the seal portion on an outer surface of the lid member so that the mutual seal portions are in close contact with each other. 27. The brazing device according to claim 25 or 26, further comprising a cooling unit for cooling the pressing member. The brazing device according to any one of claims 15 to 27, wherein the inside of the sealing body has a predetermined brazing atmosphere.

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