JP6118637B2 - Heat transfer brazing method - Google Patents

Description

  The present invention relates to a heat transfer brazing method and a related technique in which a heated mold is brought into contact with a member to be joined having a brazing material interposed at a bonding interface to heat a bonded portion.

  Various methods of brazing aluminum are classified according to the presence / absence of use of a flux, a heating method, a heating atmosphere, and the like (see Patent Document 1).

  Further, as a method for brazing a lap joint, a heat transfer brazing method is known in which a brazing material is interposed between members to be joined, and a heated mold is brought into contact with the brazed material to heat the joint. The heat transfer brazing method is a heating method that uses heat conduction by contact, so it has the advantage that the joint is heated rapidly and can be brazed in a short time, such as resistance spot welding, torch brazing, high frequency brazing. It attracts attention as a brazing method replacing the law (see Patent Document 2).

Hiroshi Kawase, brazing of aluminum, light metal, August 1986, pages 514-524 Japanese Patent Laid-Open No. 7-9124

  However, the temporary assembly (1) of the heat exchanger as shown in FIGS. 1 to 3 has a height between the joint portion of the fin (31) and the peripheral joint portion (13) (26) in the refrigerant chamber (2). Therefore, when heat transfer brazing is performed by placing molds on the top and bottom of the temporary assembly (1), one mold comes into contact with the ceiling plate (25) of the refrigerant chamber (2) that expands. The joint of the fin (31) is heated rapidly and reaches the brazing temperature in a short time, but the joint part (26) where the mold does not come into contact is heat conduction through the side wall (24). It takes time until the brazing temperature is reached with a delay in temperature rise. In this way, the member to be joined having a difference in height in the joining portion and the outer surface shape cannot sufficiently take advantage of the heat transfer brazing method that can be brazed in a short time. Also, in terms of brazing, it is not preferable that the temperature rise time differs between the joint part where the mold is in direct contact and the joint part where the mold is not in contact.

  The above problem can be solved by making a mold that matches the outer shape of the member to be joined and making the mold come into direct contact with all joints, but a dedicated mold is required for each brazed product. Therefore, it becomes a heat transfer brazing device with poor versatility.

  In view of the above-mentioned technical background, the present invention is a heat transfer brazing method with high versatility that can equally quickly heat a member to be joined that has a difference in height at the joint, and that can cope with various shapes, and related matters. Provide technology.

  That is, this invention has the structure as described in following [1]-[10].

[1] A pair of heat transfer portions that heat the joint by heat conduction by contact are arranged facing two opposing surfaces of the temporary assembly assembled by interposing a brazing material at the joint interface of the members to be joined,
A heat transfer surface of a main mold of the pair of heat transfer units, and a partial mold that is detachably attached to a heat transfer surface of a main mold of at least one heat transfer unit in a manner protruding from the heat transfer surface; A heat transfer brazing method characterized in that the joints of different heights are heated by bringing the joint into contact with the temporary assembly.

  [2] The heat transfer brazing method according to item 1 above, wherein the main mold on which the partial mold is mounted is disposed on the lower side, and the temporary assembly is sandwiched between the pair of heat transfer portions in the vertical direction.

  [3] The heat transfer brazing method according to item 1 or 2, wherein a spacer corresponding to a height after brazing of the temporary assembly is disposed between the heat transfer surfaces of the main mold of the pair of heat transfer units. .

[4] A pair of heat transfer portions that heat the joint by heat conduction by contact are arranged facing two opposing surfaces of the temporary assembly assembled by interposing a brazing material at the joint interface of the members to be joined,
A heat transfer surface of a main mold of the pair of heat transfer units, and a partial mold that is detachably attached to a heat transfer surface of a main mold of at least one heat transfer unit in a manner protruding from the heat transfer surface; A method of manufacturing a brazed product, comprising: heating a joint portion having a different height by bringing a joint into contact with the temporary assembly.

[5] In the brazed article temporary assembly, at least one of the lower plate and the upper plate has a bulging portion in the central portion, and a refrigerant chamber is formed in the central portion by overlapping these lower and upper plates. A heat exchanger in which the periphery of the refrigerant chamber is formed as a joint portion and fins are joined to the refrigerant chamber;
A pair of heat transfer portions are arranged facing the lower plate and the outer surface of the temporary assembly, and on the side where the refrigerant chamber swells, the heat transfer surface of the main mold is brought into contact with the outer surface of the refrigerant chamber, and the partial mold 5. The method for producing a brazed product according to item 4, wherein the abutment is brought into contact with the joint portion.

[6] A pair of heat transfer portions arranged to face two opposing surfaces of the temporary assembly assembled by interposing a brazing material at the bonding interface of the members to be bonded, and heating the bonding portion by heat conduction by contact,
Each of the pair of heat transfer portions has a main mold that comes into contact with the temporary assembly at a heat transfer surface facing the temporary assembly,
Further, at least one of the heat transfer portions is detachably attached to the heat transfer surface of the main mold so as to protrude from the heat transfer surface, and protrudes from the heat transfer surface to contact the temporary assembly. A heat transfer brazing device characterized by having a mold.

  [7] The transmission according to item 6 above, wherein the main mold on which the partial mold is mounted is disposed on the lower side of the temporary assembly, and the pair of heat transfer portions are disposed in such a manner as to sandwich the temporary assembly in the vertical direction. Thermal brazing device.

  [8] The heat transfer brazing device according to item 6 or 7, wherein a central part of the heat transfer surface of the main mold is in contact with the temporary assembly, and a partial mold is mounted around the central part.

  [9] The heat transfer brazing according to any one of items 6 to 9, wherein a spacer corresponding to the height of the temporary assembly after brazing is detachably attached to the heat transfer surface of the main mold. Attached equipment.

  [10] The heat transfer brazing device according to item 9, wherein the partial mold and the spacer are integrated.

  According to the invention described in [1], the joint portion located at a high position on the surface facing the heat transfer portion of the temporary assembly is in contact with the heat transfer surface of the main mold, and the joint portion located at the low position is a partial mold. Therefore, any of the joint portions having different heights can be quickly heated by heat conduction due to contact and brazed in a short time. Further, the partial mold is detachable from the main mold, and can be applied to temporary assemblies having various shapes by mounting the partial mold corresponding to the shape of the temporary assembly at a predetermined position of the main mold. .

  According to the invention described in [2], when the temporary assembly is set in the lower main mold, the temporary assembly is stored in a predetermined position if the partial mold and the joint portion at a low position are combined. It can be easily positioned.

  According to the invention described in [3], since the amount of brazing material remaining at the joint interface is kept constant and the height of the brazed product becomes the height of the spacer, high dimensional accuracy can be obtained.

  According to the invention described in [4], the joint located at a high position on the surface facing the heat transfer portion of the temporary assembly is in contact with the heat transfer surface of the main mold, and the joint located at the low position is a partial mold. Therefore, any of the joints having different heights can be quickly heated by heat conduction due to contact, and brazed in a short time to produce a brazed product. Further, the partial mold is detachable from the main mold, and can be applied to temporary assemblies having various shapes by mounting the partial mold corresponding to the shape of the temporary assembly at a predetermined position of the main mold. .

  According to the invention described in [5], at least one of the lower plate and the upper plate has a bulging portion in the central portion, and a refrigerant chamber is formed in the central portion by overlapping these lower and upper plates. In addition, in the manufacture of a heat exchanger in which the periphery of the refrigerant chamber is a joint portion, and the fin is joined to the refrigerant chamber, the joint portion, the refrigerant chamber inner surface, the upper portion of the fin, and the refrigerant are located at different heights. Each joint part on the interior surface and the lower part of the fin is quickly heated and brazed in a short time.

  According to the invention described in [6], the joining portion located at a high position on the surface facing the heat-receiving portion of the temporary assembly is in contact with the heat-receiving surface of the main mold, and the joining portion located at the low position is a partial mold. Therefore, any of the joint portions having different heights can be quickly heated by heat conduction due to contact and brazed in a short time. Further, the partial mold is detachable from the main mold, and can be applied to temporary assemblies having various shapes by mounting the partial mold corresponding to the shape of the temporary assembly at a predetermined position of the main mold. .

  According to the invention described in [7], when the temporary assembly is set in the lower main mold, if the partial mold and the joint portion at a low position are combined, the temporary assembly is stored in a predetermined position. It can be easily positioned.

  According to the invention described in [8], when the temporary assembly is set in the lower main mold, the temporary assembly of the recess formed on the main mold is dropped by mounting the partial mold. It can be easily positioned.

  According to the invention described in [9], since the amount of brazing material remaining at the joining interface is kept constant and the height of the brazing product becomes the height of the spacer, a brazing product with high dimensional accuracy can be produced.

  According to the invention described in [10], since the partial mold and the spacer are integrated, they can be attached and detached simultaneously, and the attachment / detachment work is simple.

It is a perspective view which shows an example of the temporary assembly of the heat exchanger brazed by the heat-transfer brazing apparatus of this invention. It is a disassembled perspective view of the temporary assembly of FIG. It is the XX sectional view taken on the line of FIG. It is a perspective view which shows one Embodiment of the heat-transfer brazing apparatus of this invention. It is sectional drawing which shows the brazing method of the temporary assembly using the heat-transfer brazing apparatus of FIG. FIG. 6 is an enlarged sectional view taken along line YY in FIG. 5. It is sectional drawing which shows the brazing method of the temporary assembly using the other heat-transfer brazing apparatus.

  FIG. 1 is an example of a temporary assembly (1) of a heat exchanger brazed by the heat transfer brazing device of the present invention, FIG. 2 is an exploded state of the temporary assembly (1), and FIG. 3 is a temporary assembly ( A cross-sectional view of 1) is shown.

  The temporary assembly (1) includes a lower plate (10), an upper plate (20), a fin (31), an inlet joint (32), and an outlet joint (33). The temporary assembly (1) is brazed to the three members of the lower plate (10), the upper plate (20), and the fin (31) at once using a heat transfer brazing device described later. The inlet joint (32) and the outlet joint (33) are assembled together with the lower plate (10), the upper plate (20) and the fins (31), and the joining is performed by welding after brazing.

  The lower plate (10) is a rectangular flat plate, the central part forms the bottom plate (14) of the refrigerant chamber (2), and the peripheral part forms the joint (13) for brazing with the upper plate (20) To do. In FIG. 2, the imaginary line on the upper surface of the lower plate (10) indicates the boundary between the joint portion (13) and the bottom plate (14).

  The upper plate (20) has the same planar dimensions as the lower plate (10), and has a bulging portion (23) having a rectangular shape in plan view for forming the refrigerant chamber (2) in the center portion. The part (23) constitutes the side wall (24) and the ceiling plate (25) of the refrigerant chamber (2). The peripheral edge of the bulging portion (23) on the opening side is bent outward from the side wall (24) to form a joint portion (26) for brazing to the lower plate (10). Since the height of the side wall (24) is constant in the circumferential direction, the bottom plate (14) and the ceiling plate (25) are parallel, and the outer surface of the bottom plate (14) and the outer surface of the ceiling plate (25) are flat surfaces. is there. In addition, two circular holes (27) and (28) are formed in one side wall (24) of the bulging portion (23). The lower plate (10) and the upper plate (20) are each constituted by a brazing sheet in which a brazing material (12) (22) is clad on a core material (11) (21).

  The fin (31) is formed by corrugating a bare material.

  The inlet joint (32) and the outlet joint (33) are round pipes corresponding to the circular holes (27) and (28) of the upper plate (20).

  In the temporary assembly (1), the fin (31) is inserted into the bulging portion (23) of the upper plate (20), and the lower plate (10) and the upper plate (20) are connected to the respective brazing materials ( 12) (22) faced inward, and assembled by overlapping the joints (13) and (26), and the bulging part (23) is closed by the lower plate (10) to form a circular hole ( 27) A semi-enclosed refrigerant chamber (2) is formed in which only (28) is open. In addition, an inlet joint (32) and an outlet joint (33) are inserted into the circular holes (27) and (28).

  In the temporary assembly (1), joints by heat transfer brazing are joint portions (13) and (26) around the refrigerant chamber (2), the inner surface of the ceiling plate (25) of the refrigerant chamber (2) and fins ( 31), the inner surface of the bottom plate (14) of the refrigerant chamber (2) and the fins (31). Since the fin (31) is wavy, as shown in FIG. 3, there are two surfaces having different heights, that is, the inner surface of the ceiling plate (25) and the inner surface of the bottom plate (14) of the refrigerant chamber (2). The line-shaped joint portion is provided. In the following description, the joint portion of the joint portions (13) and (25) around the refrigerant chamber (2) is abbreviated as the peripheral joint portion (A), and the inner surface of the ceiling plate (25) of the refrigerant chamber (2) and the fin A plurality of brazing portions with (31) are collectively abbreviated as a ceiling-side fin joint (B), and a plurality of brazing portions between the inner surface of the bottom plate (14) of the refrigerant chamber (2) and the fin (31). These parts are collectively referred to as a bottom plate side fin joint (C). The inlet joint (32) and the outlet joint (33) are incorporated into the temporary assembly (3) to secure an opening through the circular holes (26) and (27), and the brazing sheet brazing material (22) However, since reliable joining with the side wall (24) of the bulging part (23) is performed by welding after brazing, it does not correspond to the joint part by brazing.

  In the height direction of the temporary assembly (1), the peripheral joint portion (A) and the bottom plate side fin joint portion (C) are at the same height, and these and the ceiling side fin joint portion (B) have a height. Because of the difference, the temporary assembly (3) has joints on two surfaces having different heights.

[Heat transfer brazing device]
FIG. 4 shows an embodiment of the heat transfer brazing apparatus of the present invention, and FIGS. 5 and 6 show a method of brazing the temporary assembly (1) using the heat transfer brazing apparatus of FIG.

  The heat transfer brazing device (3) is provided with a pair of upper and lower heat transfer portions (40) and (50), and these heat transfer portions (40) and (50) run vertically on the two opposing surfaces of the temporary assembly (1). It arrange | positions in the aspect pinched | interposed into. In the brazing method of the illustrated example, the brazed posture of the temporary assembly (1) is such that the lower plate (10) is on the upper side and the upper plate (20) is on the lower side, and upside down with respect to FIGS. It is posture. In the brazing posture, the peripheral edge joint portion (A) and the bottom plate side fin joint portion (C) are located on the upper side, and the ceiling side fin joint portion (B) is located on the lower side.

  Each of the pair of heat transfer portions (40) and (50) has a main mold (41) (51) that is heated by being thermally coupled to a heater (not shown), and a temporary assembly ( The heat transfer surfaces (42) and (52) facing 1) are formed as flat surfaces that are slightly larger than the planar dimensions of the temporary assembly (1).

  The lower heat transfer portion (50) of the pair of heat transfer portions (40) and (50) is formed on the heat transfer surface (52) of the main mold (51) with a material having good thermal conductivity, for example, main heat transfer portion (50). A rectangular annular additional mold (60) composed of the same or equivalent material as the mold (51) is detachably mounted by screwing, and the additional mold (60) protrudes from the heat transfer surface (50). ing. A step having a lower inner peripheral portion and a higher outer peripheral portion is formed on the tip surface of the additional mold (60). The lower part on the inner peripheral side of the step has a height (H1) corresponding to the height of the side wall (24) of the refrigerant chamber (2) (bulging part (23)) and a width of the joint part (25). It is a partial mold (61) corresponding to the width. On the other hand, the high portion on the outer peripheral side is a spacer (62) whose height (H2) corresponds to the height of the brazed product after brazing is completed. The additional mold (60) is an integrated product of the partial mold (61) and the spacer (62). The additional mold (60) is not a complete annular body, but is opened at two locations in the circumferential direction to avoid the inlet joint (32) and the outlet joint (33) protruding from the side wall (24). It is divided into two members, large and small.

  The method of attaching and detaching the additional mold (60) is not limited, but the method using screws as shown in the drawing is simple and can be recommended. Further, the partial mold (61) and the spacer (62) may be individually detached without being integrated. The temporary assembly (1) in the illustrated example has a peripheral edge of the refrigerant chamber (1) in which the joint (26) with which the partial mold (61) abuts the heat transfer surface (52) of the main mold (51) Since it exists in the part, the partial mold (61) and the spacer (62) are integrated. When the partial mold (61) and the spacer (62) are integrated, the detachment can be performed at the same time, so that the detachment work is simplified.

  As shown in FIG. 6, the material of the lower plate (10) and the upper plate (20) of the temporary assembly (1) is a brazing sheet, and the thickness of the peripheral joint (A) in the temporary assembly (1) is This is the total thickness of the joint portions (13) and (26), in other words, the total thickness of the core material (11) (21) and the brazing material (12) (22). When this temporary assembly (1) is pressurized and heated, the brazing filler metal (12) (22) at the joint interface of the joints (13) (26) melts and part of it flows into the refrigerant chamber (2). . The total thickness of the joint portions (13) and (26) after brazing is reduced by the amount of the brazing material that has flowed, and is the sum of the thickness of the core material (11) and (21) and the thickness of the brazing material remaining at the joining interface. In this way, the height of the brazed product is lower than the height of the temporary assembly (1) before brazing. The difference in thickness of the brazing material before and after brazing varies depending on the amount of brazing material and the pressing force received from the heat transfer section (40) (50), but the spacer (62) between the upper and lower main molds (41) (51) ) Can be regulated so that the thickness of the brazing material remaining at the joint interface does not become below a certain level, and as a result, the height of the brazed product can be kept constant and high dimensional accuracy can be obtained. The height (H2) of the spacer (62) is such that when the temporary assembly (1) is sandwiched between the pair of heat transfer portions (40) and (50), the heat transfer surface (42) facing the spacer (62). It is preferable to set so that the gap (S) generated between the two is 30 to 70% of the total thickness of the brazing materials (12) and (22) before brazing.

  The temporary assembly (1) is brazed by the heat transfer brazing device (3) described above in the following procedure.

  The additional mold (60) is mounted on the heat transfer surface (52) of the lower main mold (51), and the upper plate (20) is placed on the main mold (51) with the temporary assembly ( Place 1). At this time, the temporary assembly (1) is dropped inside the partial mold (61) which is one step lower on the inner peripheral side of the additional mold (60), and the outer surface of the joint part (26) is the partial mold. By being in contact with (61), it is positioned at a predetermined position. Since the height (H1) of the partial mold (61) is set to the height of the side wall (24), the heat transfer surface (52) of the main mold (51) is the refrigerant in this positioned state. It is in contact with the outer surface of the ceiling plate (25) of the chamber (2). Further, since the height (H2) of the spacer (62) of the additional mold (60) is set to be lower than the temporary assembly (1), the outer surface of the lower plate (10) Is higher than the front end surface of the spacer (62).

  As described above, when setting the temporary assembly (1) on the lower main mold (51), the temporary assembly (1) can be obtained by aligning the joint (26) with the partial mold (61). In the predetermined position, the partial mold (61) also functions as a member for positioning the main mold (50) and the temporary assembly (1). The positioning function by the partial mold can be obtained regardless of the brazing posture of the temporary assembly, but if the main mold with the partial mold is placed on the lower side, the temporary assembly is placed on the main mold. Positioning is particularly easy because it can be placed. In addition, as in the illustrated heat exchanger, positioning is particularly easy when the heat transfer surface of the main mold is brought into contact with the center of the temporary assembly and the peripheral mold is brought into contact with the partial mold. What is necessary is just to insert the temporary assembly of the recessed part formed on a main metal mold | die by mounting | wearing with a metal mold | die.

  Next, the upper main mold (41) is placed on the lower plate (10) to apply a predetermined pressing force. As described above, since the outer surface of the lower plate (10) is slightly higher than the tip surface of the spacer (62), the heat transfer surface (42) of the main mold (41) is on the outer surface of the lower plate (10). There is a gap (S) between the heat transfer surface (42) and the front end surface of the spacer (62).

  The heaters of the pair of heat transfer units (40) and (50) are operated to heat the main molds (41) and (51). The heat of the upper main mold (41) is directly transferred to the bottom plate side fin joint (B) and the peripheral joint (A) through the lower plate (10) in contact with the heat transfer surface (42). . The heat of the lower main mold (51) is directly transmitted to the ceiling fin joint (B) through the upper plate (20) in contact with the heat transfer surface (52), and the peripheral joint (A ) Is transmitted from the heat transfer surface (52) through the partial mold (61). Since any heated molds (41), (51), and (61) are in contact with all the joints (A), (B), and (C), the joints are heated to the brazing temperature in a short time. However, the brazing material melts quickly. In this brazing process, the molten brazing material (12) (22) between the joints (13) and (26) flows to the refrigerant chamber (2) side at the peripheral joint (A), and the thickness of the brazing material is reduced. The upper main die (41) is lowered as much as it becomes thinner, but when the heat transfer surface (42) comes into contact with the tip surface of the spacer (62), the brazing material does not flow any further. The amount of brazing filler metal remaining at the joining interface is kept constant, and the height (H2) of the spacer (62) becomes the height of the brazed product.

  The heat transfer brazing apparatus of the present invention attaches a partial mold corresponding to the outer surface shape of the temporary assembly to the heat transfer surface of the main mold with respect to the temporary assembly having joints at different heights. Accordingly, the heated mold can be brought into contact with any joint portion, and the temperature can be raised in a short time. In addition, since the partial mold is detachable from the main mold, it can be applied to temporary assemblies having various shapes by mounting the partial mold corresponding to the shape of the temporary assembly at a predetermined position. Since the main mold is common to the temporary assemblies of various shapes, the versatility is high and the mold cost can be suppressed.

  The heat transfer brazing apparatus of the present invention is not limited to that of the above embodiment, and various modifications are possible.

  The partial mold is a member to be attached to the main mold in accordance with the position of the joint part of the temporary assembly and the outer surface shape, and one surface is a flat surface like the temporary assembly (1) shown in FIG. If there is, it is sufficient to attach the partial mold to only one main mold. Moreover, if it is a temporary assembly which has the junction part from which height differs on both surfaces, a partial metal mold | die will be mounted | worn with both main molds.

  The temporary assembly (4) in FIG. 7 uses two upper plates (20) having the bulging portion (23) shown in FIG. 1 and the like, and these are opposed to each other and are twice the side wall (24). A refrigerant chamber having a height is formed, and fins (35) are arranged in the refrigerant chamber. The temporary assembly (4) has upper and lower joint portions (26) and inner surfaces (ceiling and bottom of the refrigerant chamber) of the upper and lower bulge portions (23) and fins (35), and has a height on both upper and lower surfaces. Have joints at different positions. The temporary assembly (4) is mounted with a partial mold (65) corresponding to the height of the side wall (24) on the heat transfer surface (42) (52) of the upper and lower main molds (41) (51). The upper and lower main molds (41) and (51) with the heat transfer surfaces (42) and (52) in contact with the bulging part (23) and the upper and lower partial molds (65) with the joint part (26). I will let you. When using spacers to regulate the height of brazed parts, either the upper or lower partial mold (65) and the spacer may be integrated, or separate from the partial mold (65). The member may be mounted on either the upper or lower main mold. Alternatively, a spacer having a halved required height may be mounted on the upper and lower main molds, and the upper and lower spacers may be brought into contact with each other by brazing.

  Also, since the partial mold is a member selected according to the height and shape of the joint part of the temporary assembly, the number, shape, height of the partial mold, the mounting position in the main mold, etc. It is not limited by conditions other than the shape. Therefore, depending on the shape of the temporary assembly, there may be one or more partial molds. A plurality of partial molds having different heights and planar shapes may be attached. In addition, since the tip surface of the partial mold has a shape that follows the contact portion of the temporary assembly, it may be a surface that is inclined with respect to the heat transfer surface of the main mold, a curved surface, or an uneven surface.

  The partial mold preferably has a shape that makes contact with the entire area of the joint at a low position, and the temperature can be raised as quickly as possible by making contact with the entire area. However, when the partial mold and a part of the member to be joined interfere with each other, it is allowed to provide a notch in the partial mold to avoid interference. In the brazing of the temporary assembly (1) shown in FIGS. 4 and 5, interference with the joints (32) and (33) assembled on the upper plate (20) by cutting out a part of the additional mold (60) It is avoiding. Therefore, the joint part (26) of the upper plate (20) has a portion where the partial mold (61) does not come into contact, but the area of the non-contact portion is small and the entire surface of the lower plate (10) Since the heat transfer surface (52) of the upper main mold (51) is in contact, and the side surface of the partial mold (61) is in contact with the side wall (24), the connection to the joint (13) (26) The amount of heat transfer is satisfactory. In this way, when the amount of heat transfer to the joint portion at a low position is sufficient, the joint portion is rapidly heated even if there is a non-contact portion of the partial mold. In the present invention, it is not essential that the partial mold is in contact with the entire area of the joint at the low position, and the partial mold that is in contact with the joint at the low position is detachably attached to the main mold. Is an essential requirement.

  Further, the heat transfer surface of the main mold is not limited to a flat surface. If there are joints with different heights in the common parts of various types of temporary assemblies, a mold with a heat transfer surface with a different height is used as a common main mold, and other low joints are connected to this main mold. Combine the partial molds to abut. Even in such a case, a heat transfer brazing apparatus having versatility can be obtained.

  Moreover, the brazing attitude | position of a temporary assembly is not limited to the aspect which pinches | interposes a temporary assembly with an up-down direction with a pair of heat exchangers. What is necessary is just to select the brazing attitude | position stable according to the shape of the to-be-joined member, the position of a junction part, etc. suitably.

  The environment in which the heat transfer brazing is performed is not limited. However, in order to achieve better brazing, it is preferable to braze the heat transfer portion and the temporary assembly in an inert atmosphere.

  The product to be brazed by the heat transfer brazing apparatus of the present invention is not limited, but is suitable for brazing products having a wide range of joints and having joints at a high position in the central part and a low position in the peripheral part. Yes. The heat exchanger in the illustrated example has a central portion that is raised and a peripheral portion that is lowered to form a refrigerant chamber, and fins inserted into the refrigerant chamber are brazed to the ceiling and the bottom. This product is suitable for brazing using a heat brazing device.

  The temporary assembly (1) of the heat exchanger shown in FIGS. 1 to 3 was brazed using a heat transfer brazing device (3) shown in FIGS.

  As the material of the lower plate (10) and the upper plate (20) constituting the temporary assembly (1), the brazing material (12) (22) made of JIS 4045 is added to the core material (11) (21) made of JIS 3003. A clad brazing sheet having a thickness of 1 mm and a clad rate of 5% was used. The lower plate (10) is obtained by cutting the brazing sheet into a square having a width of 100 mm and a length of 100 mm. The upper plate (20) is formed by pressing the brazing sheet to raise a side wall (24) having a height of 10 mm to form a bulging portion (23), and a joint portion ( 26) is cut into a width of 100 mm and a length of 100 mm, leaving a flat plate portion. The total height of the upper plate (20) is 11 mm including the joint portion (26). The fin (31) is formed by corrugating a 0.5 mm thick bare material made of JIS 3003, and has a width of 85 mm × a length of 85 mm × a height of 10 mm. The joints (32) and (33) are circular pipes made of JIS 3003, and have an outer diameter of 8 mm, a thickness of 0.6 mm, and a length of 30 mm.

A fluoride flux of 10 g / m ² is attached to the surfaces of the brazing materials (12) and (22) of the lower plate (10) and the upper plate (20), and as shown in FIGS. The temporary assembly (1) of the heat exchanger was assembled together with 31) and the joints (32) and (33), and the lower plate (10) and the upper plate (20) were temporarily fixed by spot welding. The height of the temporary assembly (1) is a total of 12 mm including a thickness of 10 mm of the lower plate (10) and a total height of 11 mm of the upper plate (20). The height of the temporary assembly (1) of 12 mm includes 100 μm, which is the total thickness of the brazing materials (12) and (22) of the lower plate (10) and the upper plate (20).

(Example)
The heat transfer brazing device (3) has a rectangular annular additional mold (60) in the main mold (51) of the lower heat transfer section (50) of the pair of upper and lower heat transfer sections (40) (50). The upper heat transfer part (40) used only the main mold (41). The additional mold (60) is formed by integrating a partial mold (61) on the inner peripheral side and a spacer (62) on the outer peripheral side. The height (H1) of the partial mold (61) is 10 mm corresponding to the thickness of the side wall (24), and the height (H2) of the spacer (62) is the height of the temporary assembly (1). 11.95 mm obtained by subtracting 0.05 mm corresponding to 50% of the total thickness of 0.1 mm from 12 mm.

  As shown in FIG. 5, the temporary assembly (1) is placed on the main mold (51) on which the additional mold (60) is mounted, and the upper main mold (41) is further placed with a weight of 10 kg. Pressurized. In this state before brazing, the heat transfer surface (52) of the main mold (51) is in contact with the outer surface of the ceiling plate (25) of the refrigerant chamber (2), and the tip surface of the partial mold (61) is the joint. The heat transfer surface (42) of the upper main mold (41) is in contact with the entire surface of the lower plate (10). Further, a gap (S) of 0.05 mm is generated between the tip surface of the spacer (62) and the upper heat transfer surface (42).

  The assembly of the heat transfer parts (40) (50) and the temporary assembly (1) described above is performed in a nitrogen atmosphere having an oxygen concentration of 5 ppm and a dew point of −65 ° C., and then the upper and lower main molds ( 41) (51) was heated to 610 ° C with a heater (not shown), and the temporary assembly (1) was heated by heat conduction from the main mold (41) (51) and partial mold (61). It was successfully brazed in 120 seconds from the start of the temperature.

(Comparative example)
For comparison with the above-described embodiment, the same temporary assembly (1) was brazed using only the main molds (41) and (51) without mounting the partial mold (61). That is, the lower heat transfer section (50) contacts only the ceiling plate (25) of the refrigerant chamber (2) and does not contact the joint section (26).

  As in the example, the upper and lower main molds (41) and (51) were heated to 610 ° C. with a heater (not shown) in a nitrogen atmosphere, and temporarily assembled by heat conduction from the main molds (41) and (51). When the body (1) was heated, 300 seconds were required from the start of the temperature rise until satisfactory brazing was achieved.

  INDUSTRIAL APPLICATION This invention is suitable for manufacture of the brazing article which has a junction part in a wide range and has a junction part in the high position of a center part, and the low position of a peripheral part, and can be used suitably especially for brazing of a heat exchanger.

1, 4 ... Temporary assembly
2 ... Refrigerant chamber
3… Heat transfer brazing device
10 ... Lower plate (joined member)
20… Upper plate (member to be joined)
31, 35 ... Fins (members to be joined)
40, 50 ... Heat transfer part
41, 51 ... Main mold
42, 52 ... Heating surface
60 ... Additional mold
61, 65 ... Partial mold
62 ... Spacer H1 ... Partial mold height H2 ... Spacer height S ... Gap A ... Peripheral joint B ... Ceiling side fin joint C ... Bottom plate side fin joint

Claims (10)

A pair of heat transfer portions that heat the joint by heat conduction by contact are arranged facing two opposing surfaces of the temporary assembly assembled by interposing a brazing material at the joint interface of the members to be joined,
A heat transfer surface of a main mold of the pair of heat transfer units, and a partial mold that is detachably attached to a heat transfer surface of a main mold of at least one heat transfer unit in a manner protruding from the heat transfer surface; A heat transfer brazing method characterized in that the joints of different heights are heated by bringing the joint into contact with the temporary assembly.   The heat transfer brazing method according to claim 1, wherein a main mold on which the partial mold is mounted is arranged on the lower side, and the temporary assembly is sandwiched vertically between a pair of heat transfer portions.   The heat transfer brazing method according to claim 1 or 2, wherein a spacer corresponding to a height after brazing of the temporary assembly is disposed between the heat transfer surfaces of the main mold of the pair of heat transfer units. A pair of heat transfer portions that heat the joint by heat conduction by contact are arranged facing two opposing surfaces of the temporary assembly assembled by interposing a brazing material at the joint interface of the members to be joined,
A heat transfer surface of a main mold of the pair of heat transfer units, and a partial mold that is detachably attached to a heat transfer surface of a main mold of at least one heat transfer unit in a manner protruding from the heat transfer surface; A method of manufacturing a brazed product, comprising: heating a joint portion having a different height by bringing a joint into contact with the temporary assembly. In the brazed article temporary assembly, at least one of the lower plate and the upper plate has a bulging portion in the central portion, and a refrigerant chamber is formed in the central portion by overlapping these lower and upper plates. And a heat exchanger in which the periphery of the refrigerant chamber serves as a joint portion, and fins are further joined to the refrigerant chamber,
A pair of heat transfer portions are arranged facing the lower plate and the outer surface of the temporary assembly, and on the side where the refrigerant chamber swells, the heat transfer surface of the main mold is brought into contact with the outer surface of the refrigerant chamber, and the partial mold The method for manufacturing a brazed product according to claim 4, wherein the contact portion is brought into contact with the joint portion. It is arranged facing two opposing surfaces of the temporary assembly assembled by interposing a brazing filler metal at the joining interface of the members to be joined, and includes a pair of heat transfer portions that heat the joint by heat conduction by contact,
Each of the pair of heat transfer portions has a main mold that comes into contact with the temporary assembly at a heat transfer surface facing the temporary assembly,
Further, at least one of the heat transfer portions is detachably attached to the heat transfer surface of the main mold so as to protrude from the heat transfer surface, and protrudes from the heat transfer surface to contact the temporary assembly. A heat transfer brazing device characterized by having a mold.   The heat transfer brazing according to claim 6, wherein the main mold on which the partial mold is mounted is disposed on the lower side of the temporary assembly, and the pair of heat transfer portions are disposed so as to sandwich the temporary assembly in the vertical direction. Attached equipment.   The heat transfer brazing device according to claim 6 or 7, wherein a central part of the heat transfer surface of the main mold is in contact with the temporary assembly, and a partial mold is mounted around the central part. The heat transfer brazing device according to any one of claims 6 to 8 , wherein a spacer corresponding to the height of the temporary assembly after brazing is detachably attached to the heat transfer surface of the main mold. . The heat transfer brazing device according to claim 9, wherein the partial mold and the spacer are integrated.

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