WO2014156845A1 - Brazing apparatus, brazing method, and heat exchanger - Google Patents

Brazing apparatus, brazing method, and heat exchanger Download PDF

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Publication number
WO2014156845A1
WO2014156845A1 PCT/JP2014/057362 JP2014057362W WO2014156845A1 WO 2014156845 A1 WO2014156845 A1 WO 2014156845A1 JP 2014057362 W JP2014057362 W JP 2014057362W WO 2014156845 A1 WO2014156845 A1 WO 2014156845A1
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WIPO (PCT)
Prior art keywords
brazing
temperature
workpiece
heating
chamber
Prior art date
Application number
PCT/JP2014/057362
Other languages
French (fr)
Japanese (ja)
Inventor
浩隆 門
石井　裕
祐介 飯野
剛士 大澤
直孝 岩澤
正一 江島
隆 登山
孝之 森野
Original Assignee
サンデン株式会社
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Publication of WO2014156845A1 publication Critical patent/WO2014156845A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0012—Brazing heat exchangers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/005—Soldering by means of radiant energy
    • B23K1/0053—Soldering by means of radiant energy soldering by means of I.R.
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/008—Soldering within a furnace
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/012—Soldering with the use of hot gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/001—Interlayers, transition pieces for metallurgical bonding of workpieces
    • B23K35/002—Interlayers, transition pieces for metallurgical bonding of workpieces at least one of the workpieces being of light metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
    • B23K35/286—Al as the principal constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/14—Heat exchangers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B23K2103/10—Aluminium or alloys thereof

Definitions

  • the present invention relates to a brazing apparatus for brazing an aluminum member constituting a workpiece, a brazing method, and a heat exchanger manufactured thereby.
  • heat exchangers used in, for example, vehicles and cooling devices are composed of aluminum header parts and tube parts, but in this type of heat exchangers in recent years due to demands for energy saving and higher efficiency.
  • the trend of weight reduction and thinning is remarkable.
  • a high-speed brazing method has been developed by forcibly convection of a high-temperature inert gas into a brazing chamber (for example, Patent Documents). 1).
  • FIG. 6 shows the overall configuration of such a conventional brazing furnace 100
  • FIG. 8 shows a front view of a general heat exchanger (workpiece) W brazed by the brazing furnace 100.
  • the heat exchanger W as a work to be brazed is composed of aluminum header parts 1 and 1 at both ends and a tube part 2 formed between them.
  • the tube portion 2 is composed of a plurality of aluminum microtubes 3 brazed in parallel between the header portions 1 and 1, and aluminum fins 4 brazed between the microtubes 3. Yes.
  • the heat exchanger W as a work is generally thinner and lighter than the conventional product, but the header portion 1 is more than the microtubes 3 and fins 4 constituting the tube portion 2. Has a large thickness and a large heat capacity. Therefore, when similarly heated, the temperature of the header part 1 is difficult to rise, the rate of temperature rise is slow, the temperature of the tube part 2 is likely to rise, and the rate of temperature rise is fast.
  • a brazing furnace 100 in FIG. 6 includes a drying furnace 102 in which a drying chamber 101 is configured, a front chamber 103, a heating furnace 106 in which a brazing chamber 104 is configured, and a cooling chamber in the interior.
  • the drying chamber 101 is provided with a heater 105, and processing oil such as isopropylene alcohol (IPA) applied to the heat exchanger W is evaporated by heating of the heater 105.
  • a metal curtain 113 is provided between the drying chamber 101 and the front chamber 103. Nitrogen gas as an inert gas is introduced into the front chamber 103, the brazing chamber 104 and the cooling chamber 107 through a nitrogen gas introduction pipe 114. In the front chamber 103, the atmosphere is replaced with nitrogen gas. However, the metal curtain 113 separates the front chamber 103 and the drying chamber 101, and plays a role of helping to replace the atmosphere in the front chamber 103 with nitrogen gas.
  • IPA isopropylene alcohol
  • An electric heater 116 and an in-furnace fan 117 are provided in the brazing chamber 104 of the heating furnace 106, and nitrogen gas heated to a high temperature by the electric heater 116 is introduced into the brazing chamber 104 by the in-furnace fan 117. It is configured to be forced convection. At this time, the high-temperature nitrogen gas is once blown up by the in-furnace fan 117, goes to the outside, descends the inside of the heating furnace 106, goes to the inside again, rises, and passes through the tray 111. Then, the heat exchanger W is blown from below, and further rises and is sucked into the in-furnace fan 117 again (forced convection indicated by an arrow in FIG. 6).
  • the heat exchanger W placed on the tray 111 is transported by the transport means 112, and the surface IPA and processing oil are evaporated in the drying chamber 101. Thereafter, the heat exchanger W is transferred to the front chamber 103, and in the process of passing through the front chamber 103, the atmosphere around the heat exchanger W is changed to a nitrogen gas atmosphere. It is transferred from the front chamber 103 to the brazing chamber 104 and heated by forced convection of high-temperature nitrogen gas and direct radiant heat from the electric heater 116 as described above. In the brazing chamber 104, diffusion of zinc constituting a corrosion allowance starts on the surface of the heat exchanger W at about + 400 ° C. After that, the heat exchanger W is heated to + 570 ° C.
  • the header portion 1 and the tube portion 2 are brazed. Thereafter, the heat exchanger W is transferred to the cooling chamber 107, and gradually cooled in a nitrogen gas atmosphere in the cooling chamber 107, and finally reaches the rear chamber 109.
  • FIG. 7 shows the temperature transition of each part of the heat exchanger W brazed by the conventional brazing furnace 100.
  • the broken line indicates the ideal temperature transition
  • the alternate long and short dash line indicates the temperature transition of the part where the heating rate is fast (the tube part 2)
  • the solid line shows the temperature transition of the part where the heating rate is slow (the header part 1). Yes.
  • the temperature of the header portion 1 having a large heat capacity is difficult to increase, and the temperature of the tube portion 2 having a small heat capacity is likely to increase. Therefore, when the heat exchanger (workpiece) W in the brazing chamber 104 is heated, as shown in FIG. 7, the heating rate of the header portion 1 is slow (solid line), and from the ideal temperature transition (dashed line). The temperature is lowered, the temperature raising rate of the tube portion 2 is fast (dashed line), and is higher than the ideal temperature transition (dashed line).
  • the tube part 2 having a smaller heat capacity is the first in the method of heating by forced convection of high-temperature nitrogen gas as in the conventional brazing furnace 100.
  • the temperature of the header portion 1 having a large heat capacity is delayed. Therefore, the header part 1 and the tube part 2 cannot be heated uniformly, and deformation or generation of excessive corrosion allowance occurs in the excessively heated place P1 (tube part 2 shown in FIG. 8).
  • the place P2 header portion 1 shown in FIG. 8) where the heating is insufficient, the brazing defect or the insufficient corrosion allowance is generated.
  • brazing involves irradiating the entire workpiece with near infrared rays (see, for example, Patent Document 3 and Patent Document 4).
  • the present invention has been made in order to solve the conventional technical problems, and can achieve uniform temperature rise in each part of the work with a relatively simple configuration and realize high-speed brazing.
  • the brazing apparatus includes a front chamber for replacing the atmosphere with an inert gas and a brazing chamber for heating the workpiece, and brazes an aluminum member constituting the workpiece in the brazing chamber.
  • an auxiliary heating means is provided in the front chamber for heating a portion where the rate of temperature rise of the workpiece is low.
  • the brazing device according to the invention of claim 2 is provided with a drying chamber for evaporating the processing oil applied to the workpiece, a front chamber for replacing the atmosphere with an inert gas, and a brazing chamber for heating the workpiece in order.
  • An aluminum member constituting a workpiece is brazed in a brazing chamber, and is provided with an auxiliary heating means provided in the drying chamber for preferentially heating a portion where the temperature rise rate of the workpiece is slow. .
  • the brazing device according to the invention of claim 3 is characterized in that, in the above invention, the auxiliary heating means heats a portion where the temperature rise rate of the workpiece is slow by irradiating near infrared rays.
  • the temperature of the part where the heating rate of the workpiece is slow is + 420 ° C. or approximately + 420 ° C.
  • the temperature of the part where the heating rate is fast is + 400 ° C. or approximately + 400 ° C.
  • the workpiece is transferred to the brazing chamber at a point in time.
  • the temperature of the workpiece heated in the brazing chamber in the above invention is at least + 450 ° C. or more and less than + 500 ° C.
  • the temperature difference between the portion where the heating rate is slow and the portion where the heating rate is fast is within 10 deg.
  • the brazing device of the invention of claim 6 is characterized in that, in each of the above inventions, the work is a heat exchanger composed of a header portion and a tube portion, and the auxiliary heating means heats the header portion.
  • the pre-process for replacing the atmosphere with an inert gas in the front chamber and the heating process for heating the work are sequentially performed to braze the aluminum member constituting the work.
  • the part where the temperature raising rate of the workpiece is slow is heated.
  • the brazing method of the invention of claim 8 includes a drying step for evaporating the processing oil applied to the work in the drying chamber, a pre-step for replacing the atmosphere with an inert gas in the front chamber, and heating for heating the work.
  • a drying step for evaporating the processing oil applied to the work in the drying chamber
  • a pre-step for replacing the atmosphere with an inert gas in the front chamber
  • heating for heating the work.
  • the brazing method of the invention of claim 9 is characterized in that, in the preceding step of the invention of claim 7 or claim 8, in the preceding step, the portion where the temperature rise rate of the workpiece is slow is heated by irradiating near infrared rays.
  • the brazing method of the invention of claim 10 is the temperature of the part where the temperature rise rate of the work is slow at + 420 ° C. or approximately + 420 ° C. and the temperature rise rate is fast in the preceding process in the invention of claims 7 to 8.
  • the process moves to a heating step.
  • the temperature difference between the portion where the heating rate is slow and the portion where the heating rate is fast is 20 degrees. In the range where the temperature of the workpiece is + 500 ° C. or more, the temperature difference between the part where the temperature rising rate is slow and the part where the temperature rising rate is fast is within 10 deg.
  • the heat exchanger of the invention of claim 12 comprises a header part and a tube part, and the header part is heated in the pre-process of the brazing method of claims 7 to 11 or the header part is prioritized in the drying process. It is characterized by being manufactured by heating.
  • the work is configured by performing a pre-process for replacing the atmosphere with an inert gas in the front chamber, and then performing a heating process for heating the work in the brazing chamber.
  • auxiliary heating means is provided in the front chamber, and the part where the temperature rise rate of the workpiece is slow is heated by the auxiliary heating means in the previous process, so before the workpiece is heated in the brazing chamber.
  • the temperature of the part where the rate of temperature rise is slow in the previous step in the front chamber can be increased in advance.
  • the temperature of the part where the temperature rise rate is slow in the previous process in the front chamber is raised first, and the part where the temperature rise rate is fast is matched with the temperature rise of the part where the temperature rise rate is slow as in the past. Because there is no, it can meet the demand for high speed. In this case, since the temperature rise by the auxiliary heating means in the front chamber is still low, the adverse effect of oxygen can be ignored even in the previous step of replacing the atmosphere with an inert gas, and the structure is relatively simple. Can be realized.
  • the drying process which evaporates the processing oil apply
  • an auxiliary heating means is provided in the drying chamber, and the temperature rise rate of the workpiece is low in the drying process. Is heated preferentially by the auxiliary heating means, so that the temperature of the portion where the temperature rise rate is slow can be raised in advance in the drying step in the drying chamber before the workpiece is heated in the brazing chamber.
  • the part where the temperature rise rate is slow in the drying process in the drying chamber is preferentially heated and the temperature is raised first.
  • the demand for high speed can be satisfied.
  • the temperature rise by the auxiliary heating means in the drying chamber is still low, the adverse effect of oxygen can be ignored even in the drying process in which the atmosphere is replaced with an inert gas, and the structure is relatively simple. Can be realized.
  • the temperature of the part where the heating rate of the workpiece is slow is + 420 ° C or about + 420 ° C
  • the temperature of the part where the heating rate is fast is + 400 ° C or about + 400 ° C.
  • part with a slow temperature increase rate and temperature increase rate are
  • the temperature difference between fast parts is within 20 deg and the workpiece temperature is in the range of + 500 ° C or higher
  • the temperature difference between the part where the heating rate is slow and the part where the heating rate is fast is within 10 deg. It is possible to achieve good brazing by raising the temperature to a low temperature.
  • FIG. 1 shows an overall configuration of a brazing apparatus SB as an embodiment to which the present invention is applied
  • FIG. 2 shows a front view of a heat exchanger W as an embodiment of a workpiece to be brazed.
  • the heat exchanger W as a work to be brazed is used as a radiator or an evaporator in a vehicle, a cooling device or the like, and its structure is the same as that in the case of FIG. That is, the heat exchanger W is composed of aluminum header parts 1 and 1 at both ends and a tube part 2 formed between them, and the tube part 2 is parallel between the header parts 1 and 1.
  • the heat exchanger W as a work of the embodiment is generally thinner and lighter than the conventional product as described above, and the header portion 1 actually flows into the header portion 1.
  • the inlet pipe and the outlet pipe (not shown) that flow out are connected.
  • the header portion 1 has a thickness dimension larger than that of the microtube 3 and the fin 4 constituting the tube portion 2, and has a large heat capacity. Therefore, when similarly heated, the temperature of the header part 1 is difficult to rise, the rate of temperature rise is slow, the temperature of the tube part 2 is likely to rise, and the rate of temperature rise is fast.
  • the brazing apparatus SB of FIG. 1 as an embodiment of the brazing apparatus of the present invention is a so-called high-speed brazing furnace, and includes a drying furnace 12 in which a drying chamber 11 is configured, a front chamber 13, It consists of heating furnaces 17 and 18 in which brazing chambers 14 and 16 are respectively configured, a cooling furnace 21 in which a cooling chamber 19 is configured, and a rear chamber 22, which are successively arranged.
  • the heat exchanger W placed on and held on the air-permeable tray 23 is transferred to the drying chamber 11, the front chamber 13, and the brazing chambers 14 and 16 by an air-permeable conveying means (mesh belt or roller) 24.
  • the cooling chamber 19 and the rear chamber 22 are conveyed in this order.
  • the drying chamber 11 is provided with a heater 10, and the processing oil such as isopropylene alcohol (IPA) applied to the heat exchanger W is evaporated by heating the heater 10.
  • a metal curtain 26 is provided between the drying chamber 11 and the front chamber 13. Nitrogen gas as an inert gas is introduced into the front chamber 13, the brazing chambers 14, 16 and the cooling chamber 19 through a nitrogen gas introduction pipe 27.
  • a near infrared irradiation device 31 as an auxiliary heating means is disposed in the front chamber 13.
  • the near-infrared irradiation device 31 includes a near-infrared lamp that generates near-infrared light and a reflecting mirror that collects the near-infrared light generated by the near-infrared lamp toward an irradiation target.
  • the heat exchanger (Work)
  • the heat capacity of W is large and the header portions 1 and 1 at both ends where the rate of temperature rise is slow are provided so as to irradiate near infrared rays.
  • the position of the near infrared irradiation device 31 and / or the irradiation direction of the near infrared radiation is indicated by a broken line in FIG. 3 according to the size and shape of the work (heat exchanger) and the position of the part where the temperature increase rate is slow. It can be changed as shown.
  • an electric heater 28 as a main heating means and a furnace fan 29 as a forced convection means are respectively provided as shown in FIG. Therefore, the nitrogen gas heated to a high temperature is forcedly convected into the brazing chambers 14 and 16 by the in-furnace fan 29.
  • a hood 32 is provided below the furnace fan 29, and the lower end of the hood 32 is opened above the conveying means 24, and is spaced from the inner wall surfaces of the heating furnaces 17 and 18. The upper end is opened immediately below the in-furnace fan 29 and then narrowed as it gradually goes up.
  • the high-temperature nitrogen gas is once blown up by the furnace fan 29, hits the upper walls of the heating furnaces 17 and 18, goes outward, and falls outside the hood 32 (inside the side walls of the heating furnaces 17 and 18). After hitting the bottom wall and heading inward again, it rises, passes through the conveying means 24 and the tray 23, and is blown onto the heat exchanger W from below. Then, after passing through the heat exchanger W, the inside of the hood 32 is further raised and sucked into the furnace fan 29 again (forced convection indicated by an arrow in FIG. 4).
  • the brazing operation of the heat exchanger W by the brazing apparatus SB of the embodiment having the above configuration will be described.
  • the heat exchanger (work) W is set in a predetermined jig, and the header portions 1 and 1 and the tube portion 2 are arranged in a state as shown in FIG.
  • the heat exchanger (workpiece) W in this state is placed on the tray 23 and the tray 23 is placed on the conveying means 24 together.
  • the heat exchanger (workpiece) W placed on the tray 23 is transported by the transport means 24, and the surface IPA and processing oil are evaporated in the drying chamber 11 (drying process). Thereafter, the heat exchanger W is transferred to the front chamber 13 through the metal curtain 26, and the atmosphere around the heat exchanger W is changed to a nitrogen gas atmosphere in the process of passing therethrough (pre-process).
  • near infrared rays are irradiated from the near infrared irradiation device 31 toward the header portions 1 and 1 of the heat exchanger (work) W as shown in FIG.
  • the heat exchanger (workpiece) W is sequentially transferred from the front chamber 13 to the brazing chamber 14 of the heating furnace 17, and forced convection of high-temperature nitrogen gas by the in-furnace fan 29 as described above and direct radiant heat from the electric heater 28. Heated by.
  • the heat exchanger (work) W is preheated in the brazing chamber 14, it is then transferred to the brazing chamber 16 of the heating furnace 18, and forced convection of high-temperature nitrogen gas by an in-furnace fan 29 and an electric heater. Further heating by direct radiant heat from 28.
  • the header part 1 and the tube part 2 are brazed in the heating process from the preheating in the brazing chamber 14 to the heating in the brazing 16
  • the heat exchanger W is moved to the cooling chamber 19. After being transferred and gradually cooled in the nitrogen gas atmosphere in the cooling chamber 19 (cooling step), the final chamber 22 is reached and brazing is completed.
  • Control of the brazing device SB that is, the conveying speed of the heat exchanger (workpiece) W by the conveying means 24, the irradiation amount of near infrared rays by the near infrared irradiation device 31 in the front chamber 13, the brazing chambers 14, 16
  • the amount of heat generated by the electric heater 28 and the operation of the in-furnace fan 29 are determined by detecting the temperature of the nitrogen gas in each of the chambers 13, 14, 16 and / or the temperature of each part of the heat exchanger (workpiece) W. It is executed by the controller C based on the outputs of the detection devices (thermocouples, etc.) K1 to K3.
  • the controller C is constituted by a microcomputer, and a control program for realizing temperature transition of each part of the heat exchanger (work) W described below is incorporated in advance.
  • the temperature transition of each part of the heat exchanger (workpiece) W brazed by the brazing apparatus SB will be described with reference to the temperature graph shown in the lower side of FIG.
  • the broken line in the graph shown in the lower part of FIG. 1 indicates the temperature of the tube part 2 having a high temperature rising rate in the heat exchanger W
  • the solid line indicates the temperature transition of the header part 1 having a low temperature rising rate.
  • the header portions 1 and 1 of the heat exchanger (work) W are irradiated with near-infrared rays from the near-infrared irradiation device 31.
  • the temperature of 1 (solid line) rises before the temperature of the tube portion 2 (broken line).
  • the temperature of the header portion 1 of the heat exchanger (work) W is + 420 ° C. or approximately + 420 ° C.
  • the temperature of the tube portion 2 is + 400 ° C. or approximately + 400 ° C. Raise.
  • the heat exchanger (workpiece) W is transferred to the brazing chamber 14 and the heating process is started.
  • the heat exchanger (work) W is preheated for a predetermined time by forced circulation of high-temperature nitrogen gas by the in-furnace fan 29 and radiant heat from the electric heater 28 as described above.
  • the temperature rise since the heat capacity of the tube portion 2 is small, the temperature rises steeply (broken line), but since the header portion 1 has a large heat capacity, the temperature rise is more gradual (solid line).
  • the temperature of the header portion 1 since the temperature of the header portion 1 is preliminarily heated by the near infrared rays so that the temperature of the header portion 1 becomes higher than that of the tube portion 2 in the previous step in the front chamber 13, the temperature (dashed line) of the tube portion 2 is the header during the preheating. Although they overtake the temperature of part 1 (solid line), they transition at an approximate temperature.
  • the heat exchanger (workpiece) W is then transferred to the brazing 16.
  • the heat exchanger (work) W is heated for a predetermined time by forced circulation of high-temperature nitrogen gas by the in-furnace fan 29 and radiant heat from the electric heater 28 as described above. And it heats to +570 degreeC or more +600 degrees C or less finally.
  • the temperature of the heat exchanger (workpiece) W is at least + 450 ° C. or more (a temperature in the range of + 440 ° C.
  • the temperature difference between the header portion 1 and the tube portion 2 is kept within 5 deg in the embodiment. In the range of + 500 ° C. or higher, the temperature difference between the header portion 1 and the tube portion 2 is kept within 2.5 deg in the embodiment. In the embodiment, the temperature difference between the header part 1 and the tube part 2 is kept within 5 deg when the temperature of the heat exchanger (workpiece) W is + 450 ° C. or more and less than + 500 ° C., and the temperature difference is kept within + 500 ° C. or more.
  • the temperature difference between the header part 1 and the tube part 2 is kept within 20 deg at least when the temperature of the heat exchanger (workpiece) W is + 440 ° C. or higher and less than + 500 ° C., and + 500 ° C. or higher. In this range, if the temperature difference is kept within 10 deg, it is considered that the amount of zinc diffusion and distortion can be within the allowable range. Thereby, the header part 1 and the tube part 2 (the microtube 3 and the fin 4) are brazed.
  • a pre-process for replacing the atmosphere with nitrogen gas in the front chamber 13 is performed, and then a heating process for preheating and heating the heat exchanger (workpiece) W in the brazing chambers 14 and 16 is performed.
  • the near-infrared irradiation device 31 is provided in the front chamber 13 and heat is applied in the previous step. Since the header portion 1, which is a portion where the temperature rising rate of the exchanger (work) W is slow, is heated by the near infrared irradiation device 31, before the heat exchanger (work) W is heated in the brazing chambers 14, 16.
  • the temperature of the header portion 1 having a slow temperature increase rate can be raised in advance in the previous step in the front chamber 13.
  • the temperature rise of the header portion 1 having a slow temperature rise rate is matched with the temperature rise of the tube portion 2 having a fast temperature rise rate of the heat exchanger (workpiece) W.
  • the entire area where the heat exchanger (workpiece) W needs to be brazed as shown by the broken line X in FIG. 5 is uniform. It becomes possible to raise the temperature. Therefore, it is possible to avoid the occurrence of excessive corrosion allowance and a decrease in corrosion resistance when the heat exchanger W composed of the header portion 1 and the tube portion 2 is brazed.
  • the temperature (solid line) of the header portion 1 having a slow temperature rise rate is raised first in the previous step in the front chamber 13, and the temperature rise rate is increased in the temperature rise of the portion where the temperature rise rate is slow as in the prior art. Because it does not match the fast parts, it can meet the demand for higher speed. In this case, since the temperature rise by the near-infrared irradiation device 31 in the front chamber 13 is still low (+ 400 ° C. to + 420 ° C.), the adverse effect of oxygen should be ignored even in the previous step of replacing the atmosphere with nitrogen gas. Can do.
  • the heating means (implementation) whose heat-resistant temperature is comparatively low as auxiliary heating means It is also possible to employ the example of the near infrared irradiation device 31).
  • the near infrared irradiation device 31 irradiates near infrared rays in the previous process and heats the header portion 1 with the slow temperature rise rate of the heat exchanger (workpiece) W, the temperature of the header portion 1 with the slow temperature rise rate is set. It becomes possible to raise the temperature more accurately than the temperature of the tube portion 2 having a high temperature rising rate.
  • the temperature of the header portion 1 with a slow temperature rise rate of the heat exchanger (work) W is + 420 ° C. or about + 420 ° C.
  • the temperature of the tube portion 2 with a high temperature rise rate is + 400 ° C. or about + 400 ° C.
  • the heat exchanger (workpiece) W was transferred to the brazing chamber 14 and shifted to the heating process, so there was no problem with the influence of oxygen in the previous process in the front chamber 13, and the subsequent soldering In the heating process in the attachment chambers 14 and 16, the temperature of the entire heat exchanger (workpiece) W can be quickly and uniformly increased from + 570 ° C. to 600 ° C.
  • the header portion 1 having a slow temperature increase rate and the temperature increase rate are
  • the temperature difference of the fast tube portion 2 is within 20 deg, preferably within 5 deg
  • the temperature of the heat exchanger (workpiece) W is + 500 ° C. or more
  • the header portion 1 with a slow temperature rise rate and the tube portion with a fast temperature rise rate Since the temperature difference of 2 is within 10 deg, preferably within 2.5 deg, it is possible to raise the temperature of the entire heat exchanger (workpiece) W more uniformly and to achieve good brazing.
  • work) W was heated with the near-infrared irradiation apparatus 31 in the front process of the front chamber 13, Claim 1 and Claim
  • the invention of 6 is not limited thereto, and as an auxiliary heating means, for example, an apparatus that sprays high-temperature inert gas (nitrogen gas) on the header portion 1 in a spot manner is also effective.
  • the header portion 1 can be heated more locally / intensively.
  • the near-infrared irradiation device 31 is provided in the front chamber 13 and the header portion 1 is heated.
  • the present invention is not limited thereto, and the near-infrared irradiation device is provided in the drying chamber 11 or the heater 10 is connected to the near-infrared irradiation device ( Auxiliary heating means), the header portion 1 having a slow temperature rise rate of the heat exchanger (work) W is preferentially heated as compared with the tube portion 2 having a high temperature rise rate, and the brazing chamber 14 is transferred from the front chamber 13 to the brazing chamber 14.
  • the temperature of the header part 1 with a slow heating rate of the heat exchanger (work) W is + 420 ° C. or approximately + 420 ° C.
  • the temperature of the tube part 2 with a fast heating rate is + 400 ° C. or approximately + 400 ° C. It may be made to become.
  • the heat exchanger has been described as a workpiece.
  • the present invention is not limited thereto, and is effective for all aluminum members manufactured by brazing except for the invention of claim 5.

Abstract

Provided is a brazing apparatus that uniformly raises the temperature of workpieces by means of a relatively simple structure, and is capable of high-speed brazing. This brazing apparatus (SB) is sequentially provided with an anterior chamber (13) in which air is substituted with an inert gas, and brazing chambers (14, 16) in which heat exchangers (workpieces) (W) are heated. Aluminum members constituting the heat exchangers (workpieces) (W) are brazed inside the brazing chambers (14, 16). The brazing apparatus (SB) is provided with a near-infrared irradiation device (an auxiliary heating means) (31) that is disposed in the anterior chamber (13), and heats a region (a header section (1)) of each heat exchanger (workpiece) (W) which rises in temperature slowly.

Description

ろう付け装置、ろう付け方法及び熱交換器Brazing apparatus, brazing method and heat exchanger
　本発明は、ワークを構成するアルミニウム部材をろう付けするろう付け装置、ろう付け方法及びそれにより製造された熱交換器に関するものである。 The present invention relates to a brazing apparatus for brazing an aluminum member constituting a workpiece, a brazing method, and a heat exchanger manufactured thereby.
　従来より例えば車両や冷却装置等にて使用される熱交換器は、アルミニウム製のヘッダー部とチューブ部とにより構成されているが、近年の省エネと高効率化の要望からこの種熱交換器においても軽量化と薄肉化の傾向が顕著なものとなっている。また、係る熱交換器（ワーク）をろう付けする場合には、高温とされた不活性ガスをろう付け室内に強制対流させることで、高速ろう付けする方法が開発されている（例えば、特許文献１参照）。 Conventionally, heat exchangers used in, for example, vehicles and cooling devices are composed of aluminum header parts and tube parts, but in this type of heat exchangers in recent years due to demands for energy saving and higher efficiency. However, the trend of weight reduction and thinning is remarkable. In addition, when brazing such a heat exchanger (work), a high-speed brazing method has been developed by forcibly convection of a high-temperature inert gas into a brazing chamber (for example, Patent Documents). 1).
　図６は係る従来のろう付け炉１００の全体構成を示し、図８はこのろう付け炉１００でろう付けされた一般的なこの種熱交換器（ワーク）Ｗの正面図を示している。ろう付けするワークとしての熱交換器Ｗは、両端のアルミニウム製ヘッダー部１、１と、それらの間に構成されたチューブ部２とから成る。チューブ部２はヘッダー部１、１間に渡って並列にろう付けされた複数本のアルミニウム製マイクロチューブ３と、これらマイクロチューブ３の間にろう付けされたアルミニウム製のフィン４とから構成されている。 FIG. 6 shows the overall configuration of such a conventional brazing furnace 100, and FIG. 8 shows a front view of a general heat exchanger (workpiece) W brazed by the brazing furnace 100. The heat exchanger W as a work to be brazed is composed of aluminum header parts 1 and 1 at both ends and a tube part 2 formed between them. The tube portion 2 is composed of a plurality of aluminum microtubes 3 brazed in parallel between the header portions 1 and 1, and aluminum fins 4 brazed between the microtubes 3. Yes.
　図８において、ワークとしての熱交換器Ｗは全体としては従来製品よりも薄肉化と軽量化が図られたものであるが、ヘッダー部１はチューブ部２を構成するマイクロチューブ３やフィン４よりも厚み寸法が大きく、熱容量は大きい。従って、同様に加熱した場合、ヘッダー部１の温度は上がり難く、昇温速度は遅くなり、チューブ部２の温度は上がり易く、昇温速度は速くなる。 In FIG. 8, the heat exchanger W as a work is generally thinner and lighter than the conventional product, but the header portion 1 is more than the microtubes 3 and fins 4 constituting the tube portion 2. Has a large thickness and a large heat capacity. Therefore, when similarly heated, the temperature of the header part 1 is difficult to rise, the rate of temperature rise is slow, the temperature of the tube part 2 is likely to rise, and the rate of temperature rise is fast.
　次に、図６のろう付け炉１００は、内部に乾燥室１０１が構成された乾燥炉１０２と、前室１０３と、内部にろう付け室１０４が構成された加熱炉１０６と、内部に冷却室１０７が構成された冷却炉１０８と、後室１０９とから構成され、それらが順次連続して配置されており、通気性のトレー１１１上に載置された熱交換器Ｗを搬送手段１１２（メッシュベルトやローラ）により、乾燥室１０１、前室１０３、ろう付け室１０４、冷却室１０７、後室１０９の順で搬送する構成とされている。 Next, a brazing furnace 100 in FIG. 6 includes a drying furnace 102 in which a drying chamber 101 is configured, a front chamber 103, a heating furnace 106 in which a brazing chamber 104 is configured, and a cooling chamber in the interior. A cooling furnace 108 configured with 107 and a rear chamber 109, which are sequentially arranged, transfer the heat exchanger W placed on the air-permeable tray 111 to the conveying means 112 (mesh A belt or a roller) conveys the drying chamber 101, the front chamber 103, the brazing chamber 104, the cooling chamber 107, and the rear chamber 109 in this order.
　前記乾燥室１０１にはヒータ１０５が設けられ、このヒータ１０５の加熱により熱交換器Ｗに塗布されたイソプロピレンアルコール（ＩＰＡ）等の加工油を蒸発させる。この乾燥室１０１と前室１０３の間にはメタルカーテン１１３が設けられている。この前室１０３、ろう付け室１０４及び冷却室１０７には窒素ガス導入パイプ１１４により、不活性ガスとしての窒素ガスが導入される。前室１０３内では大気が窒素ガスと置換されるが、メタルカーテン１１３は前室１０３内と乾燥室１０１とを仕切り、前室１０３内における大気を窒素ガスとの置換を助ける役割を果たす。 The drying chamber 101 is provided with a heater 105, and processing oil such as isopropylene alcohol (IPA) applied to the heat exchanger W is evaporated by heating of the heater 105. A metal curtain 113 is provided between the drying chamber 101 and the front chamber 103. Nitrogen gas as an inert gas is introduced into the front chamber 103, the brazing chamber 104 and the cooling chamber 107 through a nitrogen gas introduction pipe 114. In the front chamber 103, the atmosphere is replaced with nitrogen gas. However, the metal curtain 113 separates the front chamber 103 and the drying chamber 101, and plays a role of helping to replace the atmosphere in the front chamber 103 with nitrogen gas.
　加熱炉１０６のろう付け室１０４内には、電気ヒータ１１６と炉内ファン１１７が設けられており、この電気ヒータ１１６で高温に加熱された窒素ガスが炉内ファン１１７によってろう付け室１０４内に強制対流される構成とされている。このとき、高温の窒素ガスは炉内ファン１１７により一旦上に吹き上げられ、外方に向かった後、加熱炉１０６の内側を降下し、再び内方に向かった後上昇し、トレー１１１を通過して熱交換器Ｗに下から吹き付けられ、更に上昇して再び炉内ファン１１７に吸い込まれる（図６に矢印で示す強制対流）。 An electric heater 116 and an in-furnace fan 117 are provided in the brazing chamber 104 of the heating furnace 106, and nitrogen gas heated to a high temperature by the electric heater 116 is introduced into the brazing chamber 104 by the in-furnace fan 117. It is configured to be forced convection. At this time, the high-temperature nitrogen gas is once blown up by the in-furnace fan 117, goes to the outside, descends the inside of the heating furnace 106, goes to the inside again, rises, and passes through the tray 111. Then, the heat exchanger W is blown from below, and further rises and is sucked into the in-furnace fan 117 again (forced convection indicated by an arrow in FIG. 6).
　トレー１１１上に載置された熱交換器Ｗは、搬送手段１１２により搬送され、乾燥室１０１で表面のＩＰＡや加工油が蒸発処理される。その後、前室１０３に移送され、そこを通過する過程で熱交換器Ｗの周囲は窒素ガス雰囲気とされる。前室１０３からはろう付け室１０４に移送され、上述の如き高温窒素ガスの強制対流と電気ヒータ１１６からの直接の輻射熱によって加熱される。ろう付け室１０４内では＋４００℃程で熱交換器Ｗの表面に腐り代を構成する亜鉛の拡散が始まり、その後、熱交換器Ｗは＋５７０℃～６００℃まで加熱され、ヘッダー部１とチューブ部２（マイクロチューブ３とフィン４）とがろう付けされる。熱交換器Ｗはその後、冷却室１０７に移送され、この冷却室１０７内で窒素ガス雰囲気中における徐冷が行われた後、最終的に後室１０９に至る。 The heat exchanger W placed on the tray 111 is transported by the transport means 112, and the surface IPA and processing oil are evaporated in the drying chamber 101. Thereafter, the heat exchanger W is transferred to the front chamber 103, and in the process of passing through the front chamber 103, the atmosphere around the heat exchanger W is changed to a nitrogen gas atmosphere. It is transferred from the front chamber 103 to the brazing chamber 104 and heated by forced convection of high-temperature nitrogen gas and direct radiant heat from the electric heater 116 as described above. In the brazing chamber 104, diffusion of zinc constituting a corrosion allowance starts on the surface of the heat exchanger W at about + 400 ° C. After that, the heat exchanger W is heated to + 570 ° C. to 600 ° C., and the header portion 1 and the tube portion 2 (microtube 3 and fin 4) are brazed. Thereafter, the heat exchanger W is transferred to the cooling chamber 107, and gradually cooled in a nitrogen gas atmosphere in the cooling chamber 107, and finally reaches the rear chamber 109.
　図７は係る従来のろう付け炉１００によってろう付けされる熱交換器Ｗ各部の温度推移を示している。図中破線は理想の温度推移、一点鎖線は昇温速度が速い部位（前記チューブ部２）の温度推移、また、実線は昇温速度が遅い部位（前記ヘッダー部１）の温度推移を示している。 FIG. 7 shows the temperature transition of each part of the heat exchanger W brazed by the conventional brazing furnace 100. In the figure, the broken line indicates the ideal temperature transition, the alternate long and short dash line indicates the temperature transition of the part where the heating rate is fast (the tube part 2), and the solid line shows the temperature transition of the part where the heating rate is slow (the header part 1). Yes.
　前述した如く熱交換器Ｗをろう付けする場合、熱容量の大きいヘッダー部１は温度が上がり難く、熱容量の小さいチューブ部２は温度が上がり易い。そのため、ろう付け室１０４にて係る熱交換器（ワーク）Ｗを加熱した場合には、図７に示すようにヘッダー部１の昇温速度は遅く（実線）、理想の温度推移（破線）より温度が低くなり、チューブ部２の昇温速度は速く（一点鎖線）、理想の温度推移（破線）より高くなる。 When the heat exchanger W is brazed as described above, the temperature of the header portion 1 having a large heat capacity is difficult to increase, and the temperature of the tube portion 2 having a small heat capacity is likely to increase. Therefore, when the heat exchanger (workpiece) W in the brazing chamber 104 is heated, as shown in FIG. 7, the heating rate of the header portion 1 is slow (solid line), and from the ideal temperature transition (dashed line). The temperature is lowered, the temperature raising rate of the tube portion 2 is fast (dashed line), and is higher than the ideal temperature transition (dashed line).
　このように、ヘッダー部１とチューブ部２の昇温速度は異なるため、従来のろう付け炉１００のように高温の窒素ガスを強制対流させて加熱する方式では、熱容量の小さいチューブ部２が先に昇温していき、熱容量の大きいヘッダー部１の昇温は遅れる。そのため、ヘッダー部１とチューブ部２を均一に昇温させることができず、過剰に加熱される箇所Ｐ１（図８に示すチューブ部２）には変形や過剰な腐り代の生成が発生し、逆に加熱が不足する箇所Ｐ２（図８に示すヘッダー部１）にはろう付け不良や腐り代生成不足が発生してしまう。 Thus, since the heating rate of the header part 1 and the tube part 2 is different, the tube part 2 having a smaller heat capacity is the first in the method of heating by forced convection of high-temperature nitrogen gas as in the conventional brazing furnace 100. The temperature of the header portion 1 having a large heat capacity is delayed. Therefore, the header part 1 and the tube part 2 cannot be heated uniformly, and deformation or generation of excessive corrosion allowance occurs in the excessively heated place P1 (tube part 2 shown in FIG. 8). On the contrary, in the place P2 (header portion 1 shown in FIG. 8) where the heating is insufficient, the brazing defect or the insufficient corrosion allowance is generated.
　特に、薄肉化された熱交換器Ｗの場合、チューブ部２の昇温速度が速くなると過剰な腐り代が生成されてしまう。また、それを防止するために加熱温度や時間を制限すると、ヘッダー部１において十分な腐り代の生成が行われなくなり、耐食性が悪化してしまう。そのため、この種熱交換器Ｗのろう付けには、従来よりも高速な加熱と均一な昇温が要求されることになる。 In particular, in the case of the heat exchanger W having a reduced thickness, when the temperature rise rate of the tube portion 2 is increased, an excessive rotting allowance is generated. Further, if the heating temperature and time are limited in order to prevent this, a sufficient amount of corrosion is not generated in the header portion 1 and the corrosion resistance is deteriorated. For this reason, brazing of this kind of heat exchanger W requires higher speed heating and uniform temperature rise than before.
　そこで、チューブ部２の温度が所定値に上昇した時点でそこに覆いを置いて昇温を抑制し、ヘッダー部１の昇温速度に合わせる方法が開発されている（例えば、特許文献２参照）。尚、ろう付けには係る高温ガスの強制対流の他に、近赤外線をワーク全体に照射するものもある（例えば、特許文献３、特許文献４参照）。 Therefore, when the temperature of the tube portion 2 rises to a predetermined value, a method is put in place to suppress the temperature rise and adjust to the temperature rise rate of the header portion 1 (see, for example, Patent Document 2). . In addition to the forced convection of high-temperature gas, brazing involves irradiating the entire workpiece with near infrared rays (see, for example, Patent Document 3 and Patent Document 4).
特許第４５９２６４５号公報Japanese Patent No. 4592645 特開２０１０－１９６９３１号公報JP 2010-196931 A 特開２００４－３５８４８４号公報JP 2004-358484 A 特開２００４－３５８４８３号公報JP 2004-35883 A
　しかしながら、前記特許文献２のように昇温速度が速いチューブ部２の昇温を遅らせて昇温速度が遅いヘッダー部１に温度上昇を合わせる方法は、高速ろう付けに反することになる。また、前記特許文献３、４のように近赤外線で熱交換器（ワーク）Ｗ全体を加熱すれば極めて高速なろう付けが可能となるが、赤外線照射領域は非常に狭いため、ヘッダー部１とチューブ部２の均一な昇温を実現するためには、多数の近赤外線照射装置を高密度で配置しなければならなくなり、コスト的に実現性が乏しくなる。 However, the method of delaying the temperature rise of the tube portion 2 having a high temperature rise rate and adjusting the temperature rise to the header portion 1 having a slow temperature rise rate as in the above-mentioned Patent Document 2 is contrary to high-speed brazing. Further, as in Patent Documents 3 and 4, if the entire heat exchanger (workpiece) W is heated with near infrared rays, brazing at an extremely high speed is possible. However, since the infrared irradiation area is very narrow, In order to achieve a uniform temperature increase of the tube portion 2, a large number of near infrared irradiation devices must be arranged at a high density, resulting in poor cost feasibility.
　本発明は、係る従来の技術的課題を解決するために成されたものであり、比較的簡単な構成でワーク各部の昇温の均一化を図り、且つ、高速ろう付けを実現することができるろう付け装置、ろう付け方法及びそれにより製造された熱交換器を提供するものである。 The present invention has been made in order to solve the conventional technical problems, and can achieve uniform temperature rise in each part of the work with a relatively simple configuration and realize high-speed brazing. A brazing apparatus, a brazing method, and a heat exchanger manufactured thereby.
　請求項１の発明のろう付け装置は、大気を不活性ガスと置換する前室と、ワークを加熱するろう付け室とを順次備え、ろう付け室内にてワークを構成するアルミニウム部材をろう付けするものであって、前室に設けられ、ワークの昇温速度が遅い部位を加熱する補助加熱手段を備えたことを特徴とする。 The brazing apparatus according to the first aspect of the present invention includes a front chamber for replacing the atmosphere with an inert gas and a brazing chamber for heating the workpiece, and brazes an aluminum member constituting the workpiece in the brazing chamber. What is characterized is that an auxiliary heating means is provided in the front chamber for heating a portion where the rate of temperature rise of the workpiece is low.
　請求項２の発明のろう付け装置は、ワークに塗布された加工油を蒸発させる乾燥室と、大気を不活性ガスと置換する前室と、ワークを加熱するろう付け室とを順次備え、ろう付け室内にてワークを構成するアルミニウム部材をろう付けするものであって、乾燥室に設けられ、ワークの昇温速度が遅い部位を優先的に加熱する補助加熱手段を備えたことを特徴とする。 The brazing device according to the invention of claim 2 is provided with a drying chamber for evaporating the processing oil applied to the workpiece, a front chamber for replacing the atmosphere with an inert gas, and a brazing chamber for heating the workpiece in order. An aluminum member constituting a workpiece is brazed in a brazing chamber, and is provided with an auxiliary heating means provided in the drying chamber for preferentially heating a portion where the temperature rise rate of the workpiece is slow. .
　請求項３の発明のろう付け装置は、上記発明において補助加熱手段は、近赤外線を照射することによりワークの昇温速度が遅い部位を加熱することを特徴とする。 The brazing device according to the invention of claim 3 is characterized in that, in the above invention, the auxiliary heating means heats a portion where the temperature rise rate of the workpiece is slow by irradiating near infrared rays.
　請求項４の発明のろう付け装置は、上記各発明においてワークの昇温速度が遅い部位の温度が＋４２０℃又は略＋４２０℃、昇温速度が速い部位の温度が＋４００℃又は略＋４００℃となった時点で当該ワークをろう付け室に移送することを特徴とする。 In the brazing device according to the invention of claim 4, the temperature of the part where the heating rate of the workpiece is slow is + 420 ° C. or approximately + 420 ° C., and the temperature of the part where the heating rate is fast is + 400 ° C. or approximately + 400 ° C. The workpiece is transferred to the brazing chamber at a point in time.
　請求項５の発明のろう付け装置は、上記発明においてろう付け室で加熱されるワークの温度が少なくとも＋４５０℃以上＋５００℃未満の範囲では、昇温速度が遅い部位と昇温速度が速い部位の温度差を２０ｄｅｇ以内とし、ワークの温度が＋５００℃以上の範囲では、昇温速度が遅い部位と昇温速度が速い部位の温度差を１０ｄｅｇ以内とすることを特徴とする。 In the brazing device according to the invention of claim 5, the temperature of the workpiece heated in the brazing chamber in the above invention is at least + 450 ° C. or more and less than + 500 ° C. When the temperature difference is within 20 deg and the temperature of the workpiece is in the range of + 500 ° C. or higher, the temperature difference between the portion where the heating rate is slow and the portion where the heating rate is fast is within 10 deg.
　請求項６の発明のろう付け装置は、上記各発明においてワークは、ヘッダー部とチューブ部とより成る熱交換器であり、補助加熱手段はヘッダー部を加熱することを特徴とする。 The brazing device of the invention of claim 6 is characterized in that, in each of the above inventions, the work is a heat exchanger composed of a header portion and a tube portion, and the auxiliary heating means heats the header portion.
　請求項７の発明のろう付け方法は、前室にて大気を不活性ガスと置換する前工程と、ワークを加熱する加熱工程とを順次実行し、ワークを構成するアルミニウム部材をろう付けする際に、前工程において、ワークの昇温速度が遅い部位を加熱することを特徴とする。 In the brazing method according to the seventh aspect of the invention, the pre-process for replacing the atmosphere with an inert gas in the front chamber and the heating process for heating the work are sequentially performed to braze the aluminum member constituting the work. In addition, in the previous step, the part where the temperature raising rate of the workpiece is slow is heated.
　請求項８の発明のろう付け方法は、乾燥室にてワークに塗布された加工油を蒸発させる乾燥工程と、前室にて大気を不活性ガスと置換する前工程と、ワークを加熱する加熱工程とを順次実行し、ワークを構成するアルミニウム部材をろう付けする際に、乾燥工程において、ワークの昇温速度が遅い部位を優先的に加熱することを特徴とする。 The brazing method of the invention of claim 8 includes a drying step for evaporating the processing oil applied to the work in the drying chamber, a pre-step for replacing the atmosphere with an inert gas in the front chamber, and heating for heating the work. When the aluminum members constituting the workpiece are brazed in sequence, the portion where the workpiece temperature rise rate is low is preferentially heated in the drying step.
　請求項９の発明のろう付け方法は、請求項７又は請求項８の発明において前工程において、近赤外線を照射することによりワークの昇温速度が遅い部位を加熱することを特徴とする。 The brazing method of the invention of claim 9 is characterized in that, in the preceding step of the invention of claim 7 or claim 8, in the preceding step, the portion where the temperature rise rate of the workpiece is slow is heated by irradiating near infrared rays.
　請求項１０の発明のろう付け方法は、請求項７乃至請求項８の発明において前工程においてワークの昇温速度が遅い部位の温度が＋４２０℃又は略＋４２０℃、昇温速度が速い部位の温度が＋４００℃又は略＋４００℃となった時点で加熱工程に移行することを特徴とする。 The brazing method of the invention of claim 10 is the temperature of the part where the temperature rise rate of the work is slow at + 420 ° C. or approximately + 420 ° C. and the temperature rise rate is fast in the preceding process in the invention of claims 7 to 8. When the temperature reaches + 400 ° C. or approximately + 400 ° C., the process moves to a heating step.
　請求項１１の発明のろう付け方法は、上記発明において加熱工程においてワークの温度が少なくとも＋４５０℃以上＋５００℃未満の範囲では、昇温速度が遅い部位と昇温速度が速い部位の温度差を２０ｄｅｇ以内とし、ワークの温度が＋５００℃以上の範囲では、昇温速度が遅い部位と昇温速度が速い部位の温度差を１０ｄｅｇ以内にすることを特徴とする。 In the brazing method of the invention of claim 11, in the heating process of the above invention, when the temperature of the workpiece is at least + 450 ° C. or more and less than + 500 ° C., the temperature difference between the portion where the heating rate is slow and the portion where the heating rate is fast is 20 degrees. In the range where the temperature of the workpiece is + 500 ° C. or more, the temperature difference between the part where the temperature rising rate is slow and the part where the temperature rising rate is fast is within 10 deg.
　請求項１２の発明の熱交換器は、ヘッダー部とチューブ部とより成り、請求項７乃至請求項１１のろう付け方法の前工程でヘッダー部を加熱し、又は、乾燥工程でヘッダー部を優先的に加熱することにより製造されたことを特徴とする。 The heat exchanger of the invention of claim 12 comprises a header part and a tube part, and the header part is heated in the pre-process of the brazing method of claims 7 to 11 or the header part is prioritized in the drying process. It is characterized by being manufactured by heating.
　請求項１及び請求項７の発明によれば、前室にて大気を不活性ガスと置換する前工程を行い、次にろう付け室内でワークを加熱する加熱工程を実行してワークを構成するアルミニウム部材をろう付けする場合に、前室に補助加熱手段を設け、前工程においてワークの昇温速度が遅い部位を補助加熱手段により加熱するようにしたので、ろう付け室でワークを加熱する以前に、前室における前工程で予め昇温速度が遅い部位の温度を上げておくことができる。 According to the first and seventh aspects of the invention, the work is configured by performing a pre-process for replacing the atmosphere with an inert gas in the front chamber, and then performing a heating process for heating the work in the brazing chamber. When brazing aluminum members, auxiliary heating means is provided in the front chamber, and the part where the temperature rise rate of the workpiece is slow is heated by the auxiliary heating means in the previous process, so before the workpiece is heated in the brazing chamber In addition, the temperature of the part where the rate of temperature rise is slow in the previous step in the front chamber can be increased in advance.
　これにより、ろう付け室内における加熱工程中に、ワークの昇温速度が速い部位の昇温に、昇温速度が遅い部位の昇温を合わせ、ろう付け中にワーク全体を均一に昇温させることができるようになり、請求項６や請求項１２の発明の如くヘッダー部とチューブ部とより成る熱交換器をろう付けする際の過剰な腐り代の発生や耐食性の低下を未然に回避することが可能となる。 As a result, during the heating process in the brazing chamber, the temperature of the part where the heating rate of the workpiece is fast is combined with the temperature rising of the part where the heating rate is slow, and the entire workpiece is heated uniformly during brazing. Therefore, it is possible to obviate the occurrence of excessive corrosion allowance and deterioration of corrosion resistance when brazing a heat exchanger composed of a header portion and a tube portion as in the inventions of claims 6 and 12. Is possible.
　特に、前室における前工程にて昇温速度が遅い部位の温度を先に上げておくものであり、従来の如く昇温速度が遅い部位の昇温に昇温速度が速い部位を合わせるものでは無いので、高速化の要望も満たすことができる。この場合、前室内での補助加熱手段による温度上昇は依然低いので、大気を不活性ガスに置換する前工程であっても、酸素による悪影響は無視することができると共に、比較的簡単な構成にて実現することができるものである。 In particular, the temperature of the part where the temperature rise rate is slow in the previous process in the front chamber is raised first, and the part where the temperature rise rate is fast is matched with the temperature rise of the part where the temperature rise rate is slow as in the past. Because there is no, it can meet the demand for high speed. In this case, since the temperature rise by the auxiliary heating means in the front chamber is still low, the adverse effect of oxygen can be ignored even in the previous step of replacing the atmosphere with an inert gas, and the structure is relatively simple. Can be realized.
　請求項２及び請求項８の発明によれば、乾燥室にてワークに塗布された加工油を蒸発させる乾燥工程を行い、次に前室にて大気を不活性ガスと置換する前工程を行い、次にろう付け室内でワークを加熱する加熱工程を実行してワークを構成するアルミニウム部材をろう付けする場合に、乾燥室に補助加熱手段を設け、乾燥工程においてワークの昇温速度が遅い部位を補助加熱手段により優先的に加熱するようにしたので、ろう付け室でワークを加熱する以前に、乾燥室における乾燥工程で予め昇温速度が遅い部位の温度を上げておくことができる。 According to invention of Claim 2 and Claim 8, the drying process which evaporates the processing oil apply | coated to the workpiece | work in the drying chamber is performed, and the pre-process which substitutes air | atmosphere with an inert gas is performed in the front chamber next. Next, when the aluminum member constituting the workpiece is brazed by performing a heating process for heating the workpiece in the brazing chamber, an auxiliary heating means is provided in the drying chamber, and the temperature rise rate of the workpiece is low in the drying process. Is heated preferentially by the auxiliary heating means, so that the temperature of the portion where the temperature rise rate is slow can be raised in advance in the drying step in the drying chamber before the workpiece is heated in the brazing chamber.
　これにより、ろう付け室内における加熱工程中に、ワークの昇温速度が速い部位の昇温に、昇温速度が遅い部位の昇温を合わせ、ろう付け中にワーク全体を均一に昇温させることができるようになり、請求項６や請求項１２の発明の如くヘッダー部とチューブ部とより成る熱交換器をろう付けする際の過剰な腐り代の発生や耐食性の低下を未然に回避することが可能となる。 As a result, during the heating process in the brazing chamber, the temperature of the part where the heating rate of the workpiece is fast is combined with the temperature rising of the part where the heating rate is slow, and the entire workpiece is heated uniformly during brazing. Therefore, it is possible to obviate the occurrence of excessive corrosion allowance and deterioration of corrosion resistance when brazing a heat exchanger composed of a header portion and a tube portion as in the inventions of claims 6 and 12. Is possible.
　特に、乾燥室における乾燥工程にて昇温速度が遅い部位を優先的に加熱してその温度を先に上げておくものであり、従来の如く昇温速度が遅い部位の昇温に昇温速度が速い部位を合わせるものでは無いので、高速化の要望も満たすことができる。この場合、乾燥室内での補助加熱手段による温度上昇は依然低いので、大気を不活性ガスに置換する乾燥工程であっても、酸素による悪影響は無視することができると共に、比較的簡単な構成にて実現することができるものである。 In particular, the part where the temperature rise rate is slow in the drying process in the drying chamber is preferentially heated and the temperature is raised first. However, since it does not match the fast part, the demand for high speed can be satisfied. In this case, since the temperature rise by the auxiliary heating means in the drying chamber is still low, the adverse effect of oxygen can be ignored even in the drying process in which the atmosphere is replaced with an inert gas, and the structure is relatively simple. Can be realized.
　また、請求項３及び請求項９の発明の如く前工程や乾燥工程で補助加熱手段により、近赤外線を照射してワークの昇温速度が遅い部位を加熱するようにすれば、昇温速度が遅い部位の温度を速い部位の温度よりも的確に上げておくことが可能となる。 Further, as in the inventions of claim 3 and claim 9, if the portion where the temperature rise rate of the workpiece is slow is heated by the auxiliary heating means in the previous step or the drying step, the rate of temperature rise is increased. It becomes possible to raise the temperature of the slow part more accurately than the temperature of the fast part.
　特に、請求項４及び請求項１０の発明の如く前工程において、ワークの昇温速度が遅い部位の温度が＋４２０℃又は略＋４２０℃、昇温速度が速い部位の温度が＋４００℃又は略＋４００℃となった時点で当該ワークをろう付け室に移送し、加熱工程に移行するようにすれば、前室での前工程や乾燥室での乾燥工程における酸素の影響も問題無く、また、その後のろう付け室における加熱工程では、ワーク全体の温度を＋５７０℃～６００℃まで迅速且つ均一に昇温させることが可能となる。 In particular, as in the inventions of claims 4 and 10, in the previous step, the temperature of the part where the heating rate of the workpiece is slow is + 420 ° C or about + 420 ° C, and the temperature of the part where the heating rate is fast is + 400 ° C or about + 400 ° C. If the workpiece is transferred to the brazing chamber at this point, and the process proceeds to the heating process, the influence of oxygen in the previous process in the previous chamber and the drying process in the drying chamber is satisfactory, and the subsequent process In the heating process in the brazing chamber, it is possible to quickly and uniformly raise the temperature of the entire workpiece from + 570 ° C. to 600 ° C.
　そして、請求項５及び請求項１１の発明の如くろう付け室での加熱工程で加熱されるワークの温度が少なくとも＋４５０℃以上＋５００℃未満の範囲では、昇温速度が遅い部位と昇温速度が速い部位の温度差を２０ｄｅｇ以内とし、ワークの温度が＋５００℃以上の範囲では、昇温速度が遅い部位と昇温速度が速い部位の温度差を１０ｄｅｇ以内とすることで、ワーク全体を一層均一に昇温させ、良好なろう付けを実現することが可能となるものである。 And as for the temperature of the workpiece | work heated by the heating process in a brazing chamber like invention of Claim 5 and Claim 11 in the range which is at least +450 degreeC or more and less than +500 degreeC, a site | part with a slow temperature increase rate and temperature increase rate are When the temperature difference between fast parts is within 20 deg and the workpiece temperature is in the range of + 500 ° C or higher, the temperature difference between the part where the heating rate is slow and the part where the heating rate is fast is within 10 deg. It is possible to achieve good brazing by raising the temperature to a low temperature.
本発明を適用した実施例のろう付け装置の全体構成と、当該ろう付け装置で熱交換器をろう付けしたときの各部の温度推移を示す図である。It is a figure which shows the temperature transition of each part when the heat exchanger is brazed with the whole structure of the brazing apparatus of the Example to which this invention is applied, and the said brazing apparatus. 図１のろう付け装置でろう付けするワークとしての熱交換器の正面図である。It is a front view of the heat exchanger as a workpiece | work brazed with the brazing apparatus of FIG. 図１のろう付け装置の前室の構成を示す図である。It is a figure which shows the structure of the front chamber of the brazing apparatus of FIG. 図１のろう付け装置のろう付け室の構成を示す図である。It is a figure which shows the structure of the brazing chamber of the brazing apparatus of FIG. 図１のろう付け装置でろう付けされた熱交換器の正面図である。It is a front view of the heat exchanger brazed with the brazing apparatus of FIG. 従来のろう付け炉の全体構成を示す図である。It is a figure which shows the whole structure of the conventional brazing furnace. 図６のろう付け炉で熱交換器をろう付けしたときの各部の温度推移を示す図である。It is a figure which shows the temperature transition of each part when a heat exchanger is brazed with the brazing furnace of FIG. 図６のろう付け炉でろう付けされた熱交換器の正面図である。It is a front view of the heat exchanger brazed with the brazing furnace of FIG.
　以下、本発明の実施の形態について、図１～図５を参照して詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
　図１は本発明を適用した一実施例としてのろう付け装置ＳＢの全体構成を示し、図２はろう付け対象のワークの実施例としての熱交換器Ｗの正面図を示している。ろう付けするワークとしての熱交換器Ｗは、車両や冷却装置等でラジエターやエバポレータとして使用されるものであり、その構造は図８の場合と同様である。即ち、熱交換器Ｗは、両端のアルミニウム製ヘッダー部１、１と、それらの間に構成されたチューブ部２とから構成されており、チューブ部２はヘッダー部１、１間に渡って並列にろう付けされた複数本のアルミニウム製マイクロチューブ３と、これらマイクロチューブ３の間にろう付けされたアルミニウム製のフィン４とから構成されている。 FIG. 1 shows an overall configuration of a brazing apparatus SB as an embodiment to which the present invention is applied, and FIG. 2 shows a front view of a heat exchanger W as an embodiment of a workpiece to be brazed. The heat exchanger W as a work to be brazed is used as a radiator or an evaporator in a vehicle, a cooling device or the like, and its structure is the same as that in the case of FIG. That is, the heat exchanger W is composed of aluminum header parts 1 and 1 at both ends and a tube part 2 formed between them, and the tube part 2 is parallel between the header parts 1 and 1. A plurality of aluminum microtubes 3 brazed to each other, and aluminum fins 4 brazed between the microtubes 3.
　図２において、実施例のワークとしての熱交換器Ｗは前述同様に全体としては従来製品よりも薄肉化と軽量化が図られたものであり、ヘッダー部１には実際には冷媒等が流入、流出する図示しない入口管及び出口管が接続されることになる。また、ヘッダー部１はチューブ部２を構成するマイクロチューブ３やフィン４よりも厚み寸法が大きく、熱容量は大きい。従って、同様に加熱した場合、ヘッダー部１の温度は上がり難く、昇温速度は遅くなり、チューブ部２の温度は上がり易く、昇温速度は速くなることとなる。 In FIG. 2, the heat exchanger W as a work of the embodiment is generally thinner and lighter than the conventional product as described above, and the header portion 1 actually flows into the header portion 1. The inlet pipe and the outlet pipe (not shown) that flow out are connected. Further, the header portion 1 has a thickness dimension larger than that of the microtube 3 and the fin 4 constituting the tube portion 2, and has a large heat capacity. Therefore, when similarly heated, the temperature of the header part 1 is difficult to rise, the rate of temperature rise is slow, the temperature of the tube part 2 is likely to rise, and the rate of temperature rise is fast.
　次に、本発明のろう付け装置の実施例としての図１のろう付け装置ＳＢは、所謂高速ろう付け炉であり、内部に乾燥室１１が構成された乾燥炉１２と、前室１３と、内部にろう付け室１４、１６がそれぞれ構成された加熱炉１７、１８と、内部に冷却室１９が構成された冷却炉２１と、後室２２とから構成され、それらが順次連続して配置されており、通気性のトレー２３上に載置され、保持された熱交換器Ｗを通気性の搬送手段（メッシュベルトやローラ）２４により、乾燥室１１、前室１３、ろう付け室１４、１６、冷却室１９、後室２２の順で搬送する構成とされている。 Next, the brazing apparatus SB of FIG. 1 as an embodiment of the brazing apparatus of the present invention is a so-called high-speed brazing furnace, and includes a drying furnace 12 in which a drying chamber 11 is configured, a front chamber 13, It consists of heating furnaces 17 and 18 in which brazing chambers 14 and 16 are respectively configured, a cooling furnace 21 in which a cooling chamber 19 is configured, and a rear chamber 22, which are successively arranged. The heat exchanger W placed on and held on the air-permeable tray 23 is transferred to the drying chamber 11, the front chamber 13, and the brazing chambers 14 and 16 by an air-permeable conveying means (mesh belt or roller) 24. The cooling chamber 19 and the rear chamber 22 are conveyed in this order.
　前記乾燥室１１にはヒータ１０が設けられており、このヒータ１０の加熱により熱交換器Ｗに塗布されたイソプロピレンアルコール（ＩＰＡ）等の加工油を蒸発させる。この乾燥室１１と前室１３の間にはメタルカーテン２６が設けられている。この前室１３、ろう付け室１４、１６及び冷却室１９には窒素ガス導入パイプ２７により、不活性ガスとしての窒素ガスが導入される。 The drying chamber 11 is provided with a heater 10, and the processing oil such as isopropylene alcohol (IPA) applied to the heat exchanger W is evaporated by heating the heater 10. A metal curtain 26 is provided between the drying chamber 11 and the front chamber 13. Nitrogen gas as an inert gas is introduced into the front chamber 13, the brazing chambers 14, 16 and the cooling chamber 19 through a nitrogen gas introduction pipe 27.
　前室１３内では大気が窒素ガスと置換されるが、メタルカーテン２６は前室１３内と乾燥室１１とを仕切り、前室１３内における大気を窒素ガスとの置換を助ける役割を果たす。また、この前室１３内には図３に示すように補助加熱手段としての近赤外線照射装置３１が配設されている。この近赤外線照射装置３１は、近赤外線を発生する近赤外線ランプとこの近赤外線ランプが発生する近赤外線を照射対象に向けて集光する反射鏡等から構成されており、本発明では熱交換器（ワーク）Ｗの熱容量が大きく、昇温速度が遅くなる両端のヘッダー部１、１に近赤外線を照射するように設けられている。尚、この近赤外線照射装置３１の位置、及び／又は、近赤外線の照射方向は、ワーク（熱交換器）の寸法や形状、昇温速度が遅くなる部位の位置に応じて図３に破線で示すように変更可能とされている。 In the front chamber 13, the atmosphere is replaced with nitrogen gas, but the metal curtain 26 divides the front chamber 13 from the drying chamber 11, and plays a role in helping to replace the atmosphere in the front chamber 13 with nitrogen gas. Further, as shown in FIG. 3, a near infrared irradiation device 31 as an auxiliary heating means is disposed in the front chamber 13. The near-infrared irradiation device 31 includes a near-infrared lamp that generates near-infrared light and a reflecting mirror that collects the near-infrared light generated by the near-infrared lamp toward an irradiation target. In the present invention, the heat exchanger (Work) The heat capacity of W is large and the header portions 1 and 1 at both ends where the rate of temperature rise is slow are provided so as to irradiate near infrared rays. Note that the position of the near infrared irradiation device 31 and / or the irradiation direction of the near infrared radiation is indicated by a broken line in FIG. 3 according to the size and shape of the work (heat exchanger) and the position of the part where the temperature increase rate is slow. It can be changed as shown.
　加熱炉１７、１８のろう付け室１４、１６内には、図４に示す如く主加熱手段としての電気ヒータ２８と強制対流手段としての炉内ファン２９がそれぞれ設けられており、この電気ヒータ２８により高温に加熱された窒素ガスが炉内ファン２９によってろう付け室１４、１６内にそれぞれ強制対流される構成とされている。このとき、炉内ファン２９の下側にはフード３２が設けられ、このフード３２の下端は搬送手段２４の上方にて開口しており、加熱炉１７、１８の内壁面との間に間隔を存して立ち上がり、徐々に上に行くに従って窄まった後、上端が炉内ファン２９の直下にて開口する構造とされている。 In the brazing chambers 14 and 16 of the heating furnaces 17 and 18, an electric heater 28 as a main heating means and a furnace fan 29 as a forced convection means are respectively provided as shown in FIG. Therefore, the nitrogen gas heated to a high temperature is forcedly convected into the brazing chambers 14 and 16 by the in-furnace fan 29. At this time, a hood 32 is provided below the furnace fan 29, and the lower end of the hood 32 is opened above the conveying means 24, and is spaced from the inner wall surfaces of the heating furnaces 17 and 18. The upper end is opened immediately below the in-furnace fan 29 and then narrowed as it gradually goes up.
　これにより、高温の窒素ガスは炉内ファン２９により一旦上に吹き上げられ、加熱炉１７、１８の上壁に当たって外方に向かい、フード３２の外側（加熱炉１７、１８の側壁内側）を降下し、底壁に当たって再び内方に向かった後、上昇して搬送手段２４及びトレー２３を通過し、熱交換器Ｗに下から吹き付けられる。そして、熱交換器Ｗを通過した後、フード３２の内側を更に上昇して再び炉内ファン２９に吸い込まれることになる（図４に矢印で示す強制対流）。 As a result, the high-temperature nitrogen gas is once blown up by the furnace fan 29, hits the upper walls of the heating furnaces 17 and 18, goes outward, and falls outside the hood 32 (inside the side walls of the heating furnaces 17 and 18). After hitting the bottom wall and heading inward again, it rises, passes through the conveying means 24 and the tray 23, and is blown onto the heat exchanger W from below. Then, after passing through the heat exchanger W, the inside of the hood 32 is further raised and sucked into the furnace fan 29 again (forced convection indicated by an arrow in FIG. 4).
　以上の構成で、次に実施例のろう付け装置ＳＢによる熱交換器Ｗのろう付け作業について説明する。先ず、熱交換器(ワーク）Ｗを所定の治具にセットし、ヘッダー部１、１とチューブ部２が図２の如き状態に配置された状態とする。その状態の熱交換器（ワーク）Ｗをトレー２３上に載置し、トレー２３ごと搬送手段２４上に載せる。 Next, the brazing operation of the heat exchanger W by the brazing apparatus SB of the embodiment having the above configuration will be described. First, the heat exchanger (work) W is set in a predetermined jig, and the header portions 1 and 1 and the tube portion 2 are arranged in a state as shown in FIG. The heat exchanger (workpiece) W in this state is placed on the tray 23 and the tray 23 is placed on the conveying means 24 together.
　トレー２３上に載置された熱交換器(ワーク）Ｗは、搬送手段２４により搬送され、乾燥室１１で表面のＩＰＡや加工油が蒸発処理される（乾燥工程）。その後、メタルカーテン２６を介して前室１３に移送され、そこを通過する過程で熱交換器Ｗの周囲は窒素ガス雰囲気とされる（前工程）。 The heat exchanger (workpiece) W placed on the tray 23 is transported by the transport means 24, and the surface IPA and processing oil are evaporated in the drying chamber 11 (drying process). Thereafter, the heat exchanger W is transferred to the front chamber 13 through the metal curtain 26, and the atmosphere around the heat exchanger W is changed to a nitrogen gas atmosphere in the process of passing therethrough (pre-process).
　この前室１３内では、図３に示すように近赤外線照射装置３１から熱交換器（ワーク）Ｗのヘッダー部１、１に向けて近赤外線が照射される。この前室１３から熱交換器(ワーク）Ｗは、加熱炉１７のろう付け室１４に順次移送され、前述の如き炉内ファン２９による高温窒素ガスの強制対流と電気ヒータ２８からの直接の輻射熱によって加熱される。 In this anterior chamber 13, near infrared rays are irradiated from the near infrared irradiation device 31 toward the header portions 1 and 1 of the heat exchanger (work) W as shown in FIG. The heat exchanger (workpiece) W is sequentially transferred from the front chamber 13 to the brazing chamber 14 of the heating furnace 17, and forced convection of high-temperature nitrogen gas by the in-furnace fan 29 as described above and direct radiant heat from the electric heater 28. Heated by.
　このろう付け室１４内で熱交換器（ワーク）Ｗは予熱された後、次に、加熱炉１８のろう付け室１６に移送され、同じく炉内ファン２９による高温窒素ガスの強制対流と電気ヒータ２８からの直接の輻射熱によって更に加熱される。係るろう付け室１４における予熱からろう付け１６における加熱までの加熱工程でヘッダー部１とチューブ部２（マイクロチューブ３とフィン４）とがろう付けされた後、熱交換器Ｗは冷却室１９に移送され、この冷却室１９内で窒素ガス雰囲気中における徐冷が行われた後（冷却工程）、最終的に後室２２に至り、ろう付けが終了する。 After the heat exchanger (work) W is preheated in the brazing chamber 14, it is then transferred to the brazing chamber 16 of the heating furnace 18, and forced convection of high-temperature nitrogen gas by an in-furnace fan 29 and an electric heater. Further heating by direct radiant heat from 28. After the header part 1 and the tube part 2 (the microtube 3 and the fin 4) are brazed in the heating process from the preheating in the brazing chamber 14 to the heating in the brazing 16, the heat exchanger W is moved to the cooling chamber 19. After being transferred and gradually cooled in the nitrogen gas atmosphere in the cooling chamber 19 (cooling step), the final chamber 22 is reached and brazing is completed.
　上記ろう付け装置ＳＢの制御、即ち、搬送手段２４による熱交換器（ワーク）Ｗの搬送速度、前室１３内での近赤外線照射装置３１による近赤外線の照射量、各ろう付け室１４、１６内の電気ヒータ２８の発熱量及び炉内ファン２９の運転等は、各室１３、１４、１６内の窒素ガス温度、及び／又は、熱交換器（ワーク）Ｗ各部の温度をそれぞれ検出する温度検出装置（熱電対等）Ｋ１～Ｋ３の出力に基づき、コントローラＣにより実行される。このコントローラＣはマイクロコンピュータにより構成され、下記に説明する熱交換器（ワーク）Ｗの各部の温度推移を実現するための制御プログラムが予め組み込まれている。 Control of the brazing device SB, that is, the conveying speed of the heat exchanger (workpiece) W by the conveying means 24, the irradiation amount of near infrared rays by the near infrared irradiation device 31 in the front chamber 13, the brazing chambers 14, 16 The amount of heat generated by the electric heater 28 and the operation of the in-furnace fan 29 are determined by detecting the temperature of the nitrogen gas in each of the chambers 13, 14, 16 and / or the temperature of each part of the heat exchanger (workpiece) W. It is executed by the controller C based on the outputs of the detection devices (thermocouples, etc.) K1 to K3. The controller C is constituted by a microcomputer, and a control program for realizing temperature transition of each part of the heat exchanger (work) W described below is incorporated in advance.
　次に、図１の下側に示す温度グラフを参照しながら、ろう付け装置ＳＢでろう付けされる熱交換器（ワーク）Ｗ各部の温度推移を説明する。図１下に示すグラフ中の破線は熱交換器Ｗにおいて昇温速度が速いチューブ部２の温度を、実線は昇温速度が遅いヘッダー部１の温度推移をそれぞれ示している。前述したように本発明では前室１３内での前工程では、熱交換器（ワーク）Ｗのヘッダー部１、１に近赤外線照射装置３１から近赤外線を照射するので、前室１３ではヘッダー部１の温度(実線）がチューブ部２の温度（破線）よりも先に上昇していく。 Next, the temperature transition of each part of the heat exchanger (workpiece) W brazed by the brazing apparatus SB will be described with reference to the temperature graph shown in the lower side of FIG. The broken line in the graph shown in the lower part of FIG. 1 indicates the temperature of the tube part 2 having a high temperature rising rate in the heat exchanger W, and the solid line indicates the temperature transition of the header part 1 having a low temperature rising rate. As described above, in the present invention, in the pre-process in the front chamber 13, the header portions 1 and 1 of the heat exchanger (work) W are irradiated with near-infrared rays from the near-infrared irradiation device 31. The temperature of 1 (solid line) rises before the temperature of the tube portion 2 (broken line).
　そして、この前室１３内における前工程が終了する時点で、熱交換器（ワーク）Ｗのヘッダー部１の温度を＋４２０℃又は略＋４２０℃、チューブ部２の温度を＋４００℃又は略＋４００℃まで上昇させる。このようにヘッダー部１の温度が＋４２０℃付近、チューブ部２の温度が＋４００℃付近となった時点で、熱交換器（ワーク）Ｗをろう付け室１４に移送し、加熱工程に入る。 At the time when the pre-process in the front chamber 13 is completed, the temperature of the header portion 1 of the heat exchanger (work) W is + 420 ° C. or approximately + 420 ° C., and the temperature of the tube portion 2 is + 400 ° C. or approximately + 400 ° C. Raise. Thus, when the temperature of the header portion 1 is around + 420 ° C. and the temperature of the tube portion 2 is around + 400 ° C., the heat exchanger (workpiece) W is transferred to the brazing chamber 14 and the heating process is started.
　このろう付け室１４では前述の如く炉内ファン２９による高温の窒素ガスの強制循環と電気ヒータ２８からの輻射熱によって熱交換器（ワーク）Ｗを所定時間予熱する。このとき、チューブ部２は熱容量が小さいので、温度は急峻に上昇するが（破線）、ヘッダー部１は熱容量が大きいため、温度の上昇はそれよりも緩やかなものとなる（実線）。しかしながら、本発明では前室１３における前工程で予めヘッダー部１の温度がチューブ部２より高くなるように近赤外線により加熱されているので、予熱の途中でチューブ部２の温度（破線）はヘッダー部１の温度（実線）を追い越すものの、それらは近似した温度で推移する。 In the brazing chamber 14, the heat exchanger (work) W is preheated for a predetermined time by forced circulation of high-temperature nitrogen gas by the in-furnace fan 29 and radiant heat from the electric heater 28 as described above. At this time, since the heat capacity of the tube portion 2 is small, the temperature rises steeply (broken line), but since the header portion 1 has a large heat capacity, the temperature rise is more gradual (solid line). However, in the present invention, since the temperature of the header portion 1 is preliminarily heated by the near infrared rays so that the temperature of the header portion 1 becomes higher than that of the tube portion 2 in the previous step in the front chamber 13, the temperature (dashed line) of the tube portion 2 is the header during the preheating. Although they overtake the temperature of part 1 (solid line), they transition at an approximate temperature.
　ろう付け室１４における予熱が終了すると、次に熱交換器（ワーク）Ｗはろう付け１６に移送される。ここで、熱交換器（ワーク）Ｗを前述の如く炉内ファン２９による高温の窒素ガスの強制循環と電気ヒータ２８からの輻射熱によって所定時間加熱する。そして、最終的に＋５７０℃以上＋６００℃以下まで加熱する。更に、係るろう付け室１４、１６における加熱工程中（冷却工程に入るまでの間）、熱交換器（ワーク）Ｗの温度が少なくとも＋４５０℃以上（＋４４０℃～＋４５０℃の範囲の温度以上）＋５００℃未満の範囲では、ヘッダー部１とチューブ部２の温度差を実施例では５ｄｅｇ以内に保つ。また、＋５００℃以上の範囲では、ヘッダー部１とチューブ部２の温度差を実施例では２．５ｄｅｇ以内に保つものとする。尚、実施例では熱交換器（ワーク）Ｗの温度が＋４５０℃以上＋５００℃未満の範囲でヘッダー部１とチューブ部２の温度差を５ｄｅｇ以内に保ち、＋５００℃以上の範囲では該温度差を２．５ｄｅｇ以内に保つようにしたが、少なくとも熱交換器（ワーク）Ｗの温度が＋４４０℃以上＋５００℃未満の範囲でヘッダー部１とチューブ部２の温度差を２０ｄｅｇ以内に保ち、＋５００℃以上の範囲では該温度差を１０ｄｅｇ以内に保てば、亜鉛の拡散量と歪みの発生を許容範囲内とすることができると考えられる。これにより、ヘッダー部１とチューブ部２（マイクロチューブ３とフィン４）とをろう付けする。 When the preheating in the brazing chamber 14 is completed, the heat exchanger (workpiece) W is then transferred to the brazing 16. Here, the heat exchanger (work) W is heated for a predetermined time by forced circulation of high-temperature nitrogen gas by the in-furnace fan 29 and radiant heat from the electric heater 28 as described above. And it heats to +570 degreeC or more +600 degrees C or less finally. Further, during the heating process in the brazing chambers 14 and 16 (until the cooling process starts), the temperature of the heat exchanger (workpiece) W is at least + 450 ° C. or more (a temperature in the range of + 440 ° C. to + 450 ° C.) +500 In the range of less than 0 ° C., the temperature difference between the header portion 1 and the tube portion 2 is kept within 5 deg in the embodiment. In the range of + 500 ° C. or higher, the temperature difference between the header portion 1 and the tube portion 2 is kept within 2.5 deg in the embodiment. In the embodiment, the temperature difference between the header part 1 and the tube part 2 is kept within 5 deg when the temperature of the heat exchanger (workpiece) W is + 450 ° C. or more and less than + 500 ° C., and the temperature difference is kept within + 500 ° C. or more. Although kept within 2.5 deg, the temperature difference between the header part 1 and the tube part 2 is kept within 20 deg at least when the temperature of the heat exchanger (workpiece) W is + 440 ° C. or higher and less than + 500 ° C., and + 500 ° C. or higher. In this range, if the temperature difference is kept within 10 deg, it is considered that the amount of zinc diffusion and distortion can be within the allowable range. Thereby, the header part 1 and the tube part 2 (the microtube 3 and the fin 4) are brazed.
　このように発明によれば、前室１３にて大気を窒素ガスと置換する前工程を行い、次にろう付け室１４、１６内で熱交換器（ワーク）Ｗを予熱及び加熱する加熱工程を実行して熱交換器（ワーク）Ｗを構成するアルミニウム製のヘッダー部１とチューブ部２（アルミニウム部材）をろう付けする場合に、前室１３に近赤外線照射装置３１を設け、前工程において熱交換器（ワーク）Ｗの昇温速度が遅い部位であるヘッダー部１を近赤外線照射装置３１により加熱するようにしたので、ろう付け室１４、１６で熱交換器（ワーク）Ｗを加熱する以前に、前室１３における前工程で予め昇温速度が遅いヘッダー部１の温度を上げておくことができる。 Thus, according to the invention, a pre-process for replacing the atmosphere with nitrogen gas in the front chamber 13 is performed, and then a heating process for preheating and heating the heat exchanger (workpiece) W in the brazing chambers 14 and 16 is performed. When the aluminum header portion 1 and the tube portion 2 (aluminum member) constituting the heat exchanger (work) W are brazed, the near-infrared irradiation device 31 is provided in the front chamber 13 and heat is applied in the previous step. Since the header portion 1, which is a portion where the temperature rising rate of the exchanger (work) W is slow, is heated by the near infrared irradiation device 31, before the heat exchanger (work) W is heated in the brazing chambers 14, 16. In addition, the temperature of the header portion 1 having a slow temperature increase rate can be raised in advance in the previous step in the front chamber 13.
　これにより、ろう付け室１４、１６内における加熱工程中に、熱交換器（ワーク）Ｗの昇温速度が速いチューブ部２の昇温に、昇温速度が遅いヘッダー部１の昇温を合わせ、ろう付け中に図５に破線Ｘで示す熱交換器（ワーク）Ｗのろう付けが必要な全領域（ヘッダー部１とチューブ部２との接合部からチューブ部２全域に渡る範囲）を均一に昇温させることができるようになる。従って、ヘッダー部１とチューブ部２とより成る熱交換器Ｗをろう付けする際の過剰な腐り代の発生や耐食性の低下を未然に回避することが可能となる。 Thereby, during the heating process in the brazing chambers 14 and 16, the temperature rise of the header portion 1 having a slow temperature rise rate is matched with the temperature rise of the tube portion 2 having a fast temperature rise rate of the heat exchanger (workpiece) W. During the brazing, the entire area where the heat exchanger (workpiece) W needs to be brazed as shown by the broken line X in FIG. 5 (the range extending from the joint portion between the header portion 1 and the tube portion 2 to the entire tube portion 2) is uniform. It becomes possible to raise the temperature. Therefore, it is possible to avoid the occurrence of excessive corrosion allowance and a decrease in corrosion resistance when the heat exchanger W composed of the header portion 1 and the tube portion 2 is brazed.
　特に、前室１３における前工程にて昇温速度が遅いヘッダー部１の温度（実線）を先に上げておくものであり、従来の如く昇温速度が遅い部位の昇温に昇温速度が速い部位を合わせるものでは無いので、高速化の要望も満たすことができる。この場合、前室１３内での近赤外線照射装置３１による温度上昇は依然低い（＋４００℃～＋４２０℃）ので、大気を窒素ガスに置換する前工程であっても、酸素による悪影響は無視することができる。また、前室１３に近赤外線照射装置３１を設けるという比較的簡単な構成で実現することができると共に、前室１３における加熱であるため、補助加熱手段として耐熱温度が比較的低い加熱手段（実施例の近赤外線照射装置３１等）を採用することも可能となる。 In particular, the temperature (solid line) of the header portion 1 having a slow temperature rise rate is raised first in the previous step in the front chamber 13, and the temperature rise rate is increased in the temperature rise of the portion where the temperature rise rate is slow as in the prior art. Because it does not match the fast parts, it can meet the demand for higher speed. In this case, since the temperature rise by the near-infrared irradiation device 31 in the front chamber 13 is still low (+ 400 ° C. to + 420 ° C.), the adverse effect of oxygen should be ignored even in the previous step of replacing the atmosphere with nitrogen gas. Can do. Moreover, since it can implement | achieve with the comparatively simple structure of providing the near-infrared irradiation apparatus 31 in the front chamber 13, and since it is the heating in the front chamber 13, the heating means (implementation) whose heat-resistant temperature is comparatively low as auxiliary heating means It is also possible to employ the example of the near infrared irradiation device 31).
　また、前工程で近赤外線照射装置３１により、近赤外線を照射して熱交換器（ワーク）Ｗの昇温速度が遅いヘッダー部１を加熱するので、昇温速度が遅いヘッダー部１の温度を昇温速度が速いチューブ部２の温度よりも的確に上げておくことが可能となる。 Moreover, since the near infrared irradiation device 31 irradiates near infrared rays in the previous process and heats the header portion 1 with the slow temperature rise rate of the heat exchanger (workpiece) W, the temperature of the header portion 1 with the slow temperature rise rate is set. It becomes possible to raise the temperature more accurately than the temperature of the tube portion 2 having a high temperature rising rate.
　特に、前工程において、熱交換器（ワーク）Ｗの昇温速度が遅いヘッダー部１の温度が＋４２０℃又は略＋４２０℃、昇温速度が速いチューブ部２の温度が＋４００℃又は略＋４００℃となった時点で熱交換器（ワーク）Ｗをろう付け室１４に移送し、加熱工程に移行するようにしたので、前室１３での前工程における酸素の影響も問題無く、また、その後のろう付け室１４、１６における加熱工程では、熱交換器（ワーク）Ｗ全体の温度を＋５７０℃～６００℃まで迅速且つ均一に昇温させることが可能となる。 In particular, in the previous step, the temperature of the header portion 1 with a slow temperature rise rate of the heat exchanger (work) W is + 420 ° C. or about + 420 ° C., and the temperature of the tube portion 2 with a high temperature rise rate is + 400 ° C. or about + 400 ° C. At that time, the heat exchanger (workpiece) W was transferred to the brazing chamber 14 and shifted to the heating process, so there was no problem with the influence of oxygen in the previous process in the front chamber 13, and the subsequent soldering In the heating process in the attachment chambers 14 and 16, the temperature of the entire heat exchanger (workpiece) W can be quickly and uniformly increased from + 570 ° C. to 600 ° C.
　そして、ろう付け室１４、１６での加熱工程で加熱される熱交換器（ワーク）Ｗの温度が少なくとも＋４５０℃以上＋５００℃未満の範囲では、昇温速度が遅いヘッダー部１と昇温速度が速いチューブ部２の温度差を２０ｄｅｇ以内、望ましくは５ｄｅｇ以内とし、熱交換器（ワーク）Ｗの温度が＋５００℃以上の範囲では、昇温速度が遅いヘッダー部１と昇温速度が速いチューブ部２の温度差を１０ｄｅｇ以内、望ましくは２．５ｄｅｇ以内とするので、熱交換器（ワーク）Ｗ全体を一層均一に昇温させ、良好なろう付けを実現することが可能となる。 In the range where the temperature of the heat exchanger (work) W heated in the heating process in the brazing chambers 14 and 16 is at least + 450 ° C. or more and less than + 500 ° C., the header portion 1 having a slow temperature increase rate and the temperature increase rate are When the temperature difference of the fast tube portion 2 is within 20 deg, preferably within 5 deg, and the temperature of the heat exchanger (workpiece) W is + 500 ° C. or more, the header portion 1 with a slow temperature rise rate and the tube portion with a fast temperature rise rate Since the temperature difference of 2 is within 10 deg, preferably within 2.5 deg, it is possible to raise the temperature of the entire heat exchanger (workpiece) W more uniformly and to achieve good brazing.
　尚、上記実施例では前室１３の前工程において、近赤外線照射装置３１により熱交換器（ワーク）Ｗの昇温速度が遅いヘッダー部１を加熱するようにしたが、請求項１及び請求項６の発明ではそれに限らず、補助加熱手段としては例えば高温の不活性ガス（窒素ガス）をヘッダー部１にスポット的に吹き付ける装置でも有効である。但し、実施例のように近赤外線を照射するようにすれば、ヘッダー部１をより局所的／集中的に加熱することが可能となる。 In addition, in the said Example, although the header part 1 with a slow temperature increase rate of the heat exchanger (workpiece | work) W was heated with the near-infrared irradiation apparatus 31 in the front process of the front chamber 13, Claim 1 and Claim The invention of 6 is not limited thereto, and as an auxiliary heating means, for example, an apparatus that sprays high-temperature inert gas (nitrogen gas) on the header portion 1 in a spot manner is also effective. However, if near-infrared rays are irradiated as in the embodiment, the header portion 1 can be heated more locally / intensively.
　また、実施例では前室１３に近赤外線照射装置３１を設けてヘッダー部１を加熱したが、それに限らず、乾燥室１１に近赤外線照射装置を設け、或いは、ヒータ１０を近赤外線照射装置（補助加熱手段）とし、熱交換器（ワーク）Ｗの昇温速度が遅いヘッダー部１を昇温速度が速いチューブ部２に比して優先的に加熱し、前室１３からろう付け室１４に移送される時点で、熱交換器（ワーク）Ｗの昇温速度が遅いヘッダー部１の温度が＋４２０℃又は略＋４２０℃、昇温速度が速いチューブ部２の温度が＋４００℃又は略＋４００℃となるようにしてもよい。 In the embodiment, the near-infrared irradiation device 31 is provided in the front chamber 13 and the header portion 1 is heated. However, the present invention is not limited thereto, and the near-infrared irradiation device is provided in the drying chamber 11 or the heater 10 is connected to the near-infrared irradiation device ( Auxiliary heating means), the header portion 1 having a slow temperature rise rate of the heat exchanger (work) W is preferentially heated as compared with the tube portion 2 having a high temperature rise rate, and the brazing chamber 14 is transferred from the front chamber 13 to the brazing chamber 14. At the time of transfer, the temperature of the header part 1 with a slow heating rate of the heat exchanger (work) W is + 420 ° C. or approximately + 420 ° C., and the temperature of the tube part 2 with a fast heating rate is + 400 ° C. or approximately + 400 ° C. It may be made to become.
　更に、実施例では熱交換器をワークとして説明したが、それに限らず、請求項５の発明以外は、ろう付けにて製造されるアルミニウム部材全般に有効である。 Furthermore, in the embodiments, the heat exchanger has been described as a workpiece. However, the present invention is not limited thereto, and is effective for all aluminum members manufactured by brazing except for the invention of claim 5.
　ＳＢ　ろう付け装置
　Ｗ　熱交換器（ワーク）
　１　ヘッダー部（昇温速度が遅い部位）
　２　チューブ部（昇温速度が速い部位）
　３　マイクロチューブ
　４　フィン
　１３　前室
　１４、１６　ろう付け室
　１７、１８　加熱炉
　２３　トレー
　２４　搬送手段
　２８　電気ヒータ
　２９　炉内ファン
　３１　近赤外線照射装置（補助加熱手段） SB Brazing device W Heat exchanger (workpiece)
1 Header (part where temperature rise rate is slow)
2 Tube part (part with high heating rate)
3 Microtube 4 Fin 13 Front chamber 14, 16 Brazing chamber 17, 18 Heating furnace 23 Tray 24 Conveying means 28 Electric heater 29 Furnace fan 31 Near infrared irradiation device (auxiliary heating means)

Claims (12)

  1. 　大気を不活性ガスと置換する前室と、ワークを加熱するろう付け室とを順次備え、前記ろう付け室内にて前記ワークを構成するアルミニウム部材をろう付けするろう付け装置において、
    　前記前室に設けられ、前記ワークの昇温速度が遅い部位を加熱する補助加熱手段を備えたことを特徴とするろう付け装置。     In the brazing apparatus for sequentially brazing the aluminum member constituting the workpiece in the brazing chamber, comprising a front chamber for replacing the atmosphere with an inert gas, and a brazing chamber for heating the workpiece.
    A brazing apparatus comprising auxiliary heating means provided in the front chamber for heating a portion of the workpiece having a slow temperature increase rate.
  2. 　ワークに塗布された加工油を蒸発させる乾燥室と、大気を不活性ガスと置換する前室と、ワークを加熱するろう付け室とを順次備え、前記ろう付け室内にて前記ワークを構成するアルミニウム部材をろう付けするろう付け装置において、
    　前記乾燥室に設けられ、前記ワークの昇温速度が遅い部位を優先的に加熱する補助加熱手段を備えたことを特徴とするろう付け装置。     Aluminum comprising a drying chamber for evaporating the processing oil applied to the workpiece, a front chamber for replacing the atmosphere with an inert gas, and a brazing chamber for heating the workpiece, and constituting the workpiece in the brazing chamber In a brazing device for brazing a member,
    A brazing apparatus comprising an auxiliary heating means provided in the drying chamber for preferentially heating a portion of the workpiece having a slow temperature increase rate.
  3. 　前記補助加熱手段は、近赤外線を照射することにより前記ワークの昇温速度が遅い部位を加熱することを特徴とする請求項１又は請求項２に記載のろう付け装置。 The brazing device according to claim 1 or 2, wherein the auxiliary heating means heats a portion of the workpiece having a low temperature rising rate by irradiating near infrared rays.
  4. 　前記ワークの昇温速度が遅い部位の温度が＋４２０℃又は略＋４２０℃、昇温速度が速い部位の温度が＋４００℃又は略＋４００℃となった時点で当該ワークを前記ろう付け室に移送することを特徴とする請求項１乃至請求項３のうちの何れかに記載のろう付け装置。 When the temperature of the part where the heating rate of the workpiece is slow is + 420 ° C. or about + 420 ° C. and the temperature of the part where the heating rate is fast becomes + 400 ° C. or about + 400 ° C., the workpiece is transferred to the brazing chamber. The brazing apparatus according to any one of claims 1 to 3, wherein
  5. 　前記ろう付け室で加熱される前記ワークの温度が少なくとも＋４５０℃以上＋５００℃未満の範囲では、前記昇温速度が遅い部位と前記昇温速度が速い部位の温度差を２０ｄｅｇ以内とし、前記ワークの温度が＋５００℃以上の範囲では、前記昇温速度が遅い部位と前記昇温速度が速い部位の温度差を１０ｄｅｇ以内とすることを特徴とする請求項４に記載のろう付け装置。 In the range where the temperature of the workpiece heated in the brazing chamber is at least + 450 ° C. or more and less than + 500 ° C., the temperature difference between the portion where the temperature rising rate is slow and the portion where the temperature rising rate is fast is within 20 deg, 5. The brazing apparatus according to claim 4, wherein, in a temperature range of + 500 ° C. or higher, a temperature difference between a portion where the temperature rising rate is low and a portion where the temperature rising rate is high is within 10 deg.
  6. 　前記ワークは、ヘッダー部とチューブ部とより成る熱交換器であり、前記補助加熱手段は前記ヘッダー部を加熱することを特徴とする請求項１乃至請求項５のうちの何れかに記載のろう付け装置。 The said workpiece | work is a heat exchanger which consists of a header part and a tube part, The said auxiliary | assistant heating means heats the said header part, The wax in any one of Claim 1 thru | or 5 characterized by the above-mentioned. Attachment device.
  7. 　前室にて大気を不活性ガスと置換する前工程と、ワークを加熱する加熱工程とを順次実行し、前記ワークを構成するアルミニウム部材をろう付けするろう付け方法において、
    　前記前工程において、前記ワークの昇温速度が遅い部位を加熱することを特徴とするろう付け方法。     In the brazing method for performing brazing of the aluminum member constituting the workpiece by sequentially performing a pre-step of replacing the atmosphere with an inert gas in the front chamber and a heating step of heating the workpiece,
    A brazing method characterized in that, in the preceding step, a part where the temperature rise rate of the workpiece is slow is heated.
  8. 　乾燥室にてワークに塗布された加工油を蒸発させる乾燥工程と、前室にて大気を不活性ガスと置換する前工程と、ワークを加熱する加熱工程とを順次実行し、前記ワークを構成するアルミニウム部材をろう付けするろう付け方法において、
    　前記乾燥工程において、前記ワークの昇温速度が遅い部位を優先的に加熱することを特徴とするろう付け方法。     A drying process for evaporating the processing oil applied to the work in the drying chamber, a pre-process for replacing the atmosphere with an inert gas in the front chamber, and a heating process for heating the work are sequentially performed to configure the work. In a brazing method for brazing an aluminum member to be
    A brazing method characterized in that, in the drying step, a part of the workpiece having a slow temperature increase rate is preferentially heated.
  9. 　前記前工程において、近赤外線を照射することにより前記ワークの昇温速度が遅い部位を加熱することを特徴とする請求項７又は請求項８に記載のろう付け方法。 9. The brazing method according to claim 7, wherein, in the preceding step, a portion where the temperature rise rate of the workpiece is low is heated by irradiating near infrared rays.
  10. 　前記前工程において前記ワークの昇温速度が遅い部位の温度が＋４２０℃又は略＋４２０℃、昇温速度が速い部位の温度が＋４００℃又は略＋４００℃となった時点で前記加熱工程に移行することを特徴とする請求項７乃至請求項９に記載のろう付け方法。 Transition to the heating step when the temperature of the part where the heating rate of the workpiece is slow is + 420 ° C or about + 420 ° C and the temperature of the part where the heating rate is fast is + 400 ° C or about + 400 ° C in the previous step. The brazing method according to claim 7, wherein:
  11. 　前記加熱工程において前記ワークの温度が少なくとも＋４５０℃以上＋５００℃未満の範囲では、前記昇温速度が遅い部位と前記昇温速度が速い部位の温度差を２０ｄｅｇ以内とし、前記ワークの温度が＋５００℃以上の範囲では、前記昇温速度が遅い部位と前記昇温速度が速い部位の温度差を１０ｄｅｇ以内にすることを特徴とする請求項１０に記載のろう付け方法。 In the heating step, in the range where the temperature of the workpiece is at least + 450 ° C. or more and less than + 500 ° C., the temperature difference between the portion where the heating rate is slow and the portion where the heating rate is fast is within 20 degrees, and the temperature of the workpiece is + 500 ° C. 11. The brazing method according to claim 10, wherein a temperature difference between the portion where the temperature rising rate is slow and the portion where the temperature rising rate is fast is within 10 deg within the above range.
  12. 　ヘッダー部とチューブ部とより成り、請求項７乃至請求項１１のうちの何れかに記載のろう付け方法の前記前工程で前記ヘッダー部を加熱し、又は、前記乾燥工程で前記ヘッダー部を優先的に加熱することにより製造されたことを特徴とする熱交換器。 It consists of a header part and a tube part, the said header part is heated in the said previous process of the brazing method in any one of Claims 7 thru | or 11, or the said header part is given priority in the said drying process. A heat exchanger produced by heating the product.
PCT/JP2014/057362 2013-03-26 2014-03-18 Brazing apparatus, brazing method, and heat exchanger WO2014156845A1 (en)

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