WO2016067682A1 - Brazing furnace and brazing method for aluminum material - Google Patents
Brazing furnace and brazing method for aluminum material Download PDFInfo
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- WO2016067682A1 WO2016067682A1 PCT/JP2015/070550 JP2015070550W WO2016067682A1 WO 2016067682 A1 WO2016067682 A1 WO 2016067682A1 JP 2015070550 W JP2015070550 W JP 2015070550W WO 2016067682 A1 WO2016067682 A1 WO 2016067682A1
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- brazing
- chamber
- preheating
- treated
- inert gas
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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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/04—Heating appliances
-
- 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
- B23K1/19—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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- 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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- 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 furnace and an aluminum material brazing method for brazing an aluminum material.
- a CAB Controlled Atmosphere Brazing
- flux is applied to a material to be treated and the material to be treated is brazed in an inert gas atmosphere such as nitrogen.
- the fluoride-based flux used in the CAB method has a problem that its function as a flux decreases when it is oxidized by heating during brazing.
- a sufficient amount of flux is usually applied, and brazing is performed by controlling the oxygen concentration in the atmosphere to 100 ppm or less, more preferably 20 ppm or less.
- Fluoride-based flux is non-corrosive to aluminum, so from the viewpoint of corrosiveness after brazing, it is not necessary to clean the aluminum material after brazing and remove the flux residue.
- the presence of flux or flux residue may cause the following problems.
- problems such as deterioration of surface treatment property due to a flux residue may occur during the production.
- clogging due to flux or the like may occur in the refrigerant passage, or there may be a problem that the flux or the like adversely affects electronic components that contact the heat exchanger. is there.
- Patent Document 1 proposes a method of brazing using argon or helium as an inert gas. These gases can reduce the oxygen concentration and dew point in the atmosphere as compared with nitrogen that is generally used.
- Patent Document 2 discloses a method in which a front chamber of a brazing additional heat zone is made an independent structure partitioned by a door, the chamber is evacuated in a state where a material to be processed is accommodated in the front chamber, and then the chamber is decompressed with an inert gas.
- a front chamber of a brazing additional heat zone is made an independent structure partitioned by a door, the chamber is evacuated in a state where a material to be processed is accommodated in the front chamber, and then the chamber is decompressed with an inert gas.
- the oxygen concentration and dew point of the heating zone can be reduced as compared with the conventional case.
- the oxygen concentration can be reduced to about 50 ppm relatively easily.
- Patent Document 3 proposes a method using a brazing material containing a small amount of Bi (bismuth) or Be (beryllium) as a so-called fluxless brazing method in which brazing is performed without using a flux. . It is possible to braze without using flux by etching a brazing material containing Bi or the like or a clad material thereof with an acid or alkali, and heating using a brazing furnace in which oxygen concentration and dew point are strictly controlled. .
- JP2013-091066A Japanese Patent Laid-Open No. 10-277730 Japanese Patent Laid-Open No. 11-285817
- Patent Document 1 since the technique of Patent Document 1 needs to use argon or helium that is more expensive than nitrogen, it is difficult to apply it to mass production facilities.
- Patent Document 2 can reduce the oxygen concentration and dew point in the brazing additional heat zone when nitrogen is used as an inert gas.
- the technique of Patent Document 2 is applied to reduce the amount of oxygen and moisture brought into the brazing additional heat zone, the occurrence of poor bonding cannot be completely suppressed.
- Deterioration of brazeability and occurrence of poor bonding are likely to occur, for example, in a season when the dew point in the atmosphere is continuously high or when the structure of the material to be processed is complicated. As this cause, the water
- the conventional technique has a problem that it is difficult to stabilize the quality of brazing joint in brazing with a reduced amount of flux applied or brazing without using flux.
- the inventors focused on the fact that the following three points can be factors that deteriorate brazing. (1) Oil adhering to the material to be processed by molding (2) Moisture and oil adsorbed on the jig used for brazing (3) Foreign matter adhering to the jig used for brazing
- the present invention has been made in view of such a background, and a brazing furnace capable of easily stabilizing the quality of brazing joint in brazing with a reduced amount of flux applied or brazing without using a flux, and It is intended to provide a brazing method.
- One aspect of the present invention is a brazing furnace used for brazing a material to be treated made of an aluminum material, A preheating chamber and a brazing chamber;
- the preheating chamber includes a vacuum pump for depressurizing the chamber in a state in which the material to be treated is accommodated, a preheating device for preheating the material to be treated in a decompressed atmosphere, and a pressure relief chamber after the preheating.
- a return pressure gas introduction device for introducing the inert gas of The brazing chamber is a brazing furnace having a gas replacement device for introducing an inert gas into the chamber and a main heating device for heating the material to be treated to a brazing temperature.
- a material to be treated made of an aluminum material is preheated under a reduced pressure atmosphere of 100 Pa or less, Next, by supplying an inert gas, the periphery of the material to be treated is made an inert gas atmosphere, Then, it is in the brazing method of the aluminum material which brazes by heating the said to-be-processed material in the state which maintained the said inert gas atmosphere.
- the brazing furnace has the preheating chamber provided with the vacuum pump, the preheating device, and the return pressure gas introduction device. Therefore, the brazing furnace can perform pressure reduction in the room and preheating of the material to be treated while the material to be treated is accommodated in the preheating chamber. Then, by preheating the material to be treated in a reduced-pressure atmosphere, evaporation or thermal decomposition of moisture adsorbed on the material to be treated and the jig can be promoted. As a result, the amount of moisture and the like brought into the brazing chamber can be reduced as compared with the case where preheating is not performed.
- the brazing furnace can be reinstated by introducing an inert gas into the preheating chamber after the preheating is completed.
- an inert gas By performing return pressure of the preheating chamber using an inert gas, it is possible to avoid exposure of the workpiece and jig after the preheating to the atmosphere, and as a result, re-adsorption of moisture and the like to them. Can be avoided.
- the oxygen concentration and dew point in the brazing chamber can be kept at a low level as compared with a conventional brazing furnace using an inert gas.
- graphite having a sacrificial oxidation capability for the muffle of the brazing chamber an effect of reducing the manufacturing cost of the brazing furnace can be expected.
- the brazing furnace can surely reduce the amount of moisture and the like brought into the brazing chamber as compared with the conventional brazing furnace. Therefore, by using the above brazing furnace when brazing with a reduced flux application amount or without using flux, the storage environment and usage status of the materials to be processed, jigs and brazing materials, the outside of the furnace It is possible to suppress the influence of environmental fluctuations on brazing. As a result, the brazing furnace can easily stabilize the quality of the brazing joint, and can suppress the deterioration of the brazing property and the occurrence of poor bonding.
- the brazing furnace can be suitably used in, for example, high-temperature and high-humidity areas and seasons because the influence of the storage condition of the material to be treated on the brazing property can be suppressed.
- the brazing furnace can achieve good brazing even in a working environment where strict management such as storage environment of the material to be processed and jigs is difficult.
- the brazing method of the above aspect performs preheating in a reduced pressure atmosphere, return pressure by supplying an inert gas, and brazing in an inert gas atmosphere. Therefore, as described above, when brazing with a reduced amount of flux applied or brazing without using a flux, the storage environment and usage status of the material to be treated, the jig and the brazing material, the environment outside the furnace, It is possible to suppress the influence of fluctuation or the like on the brazing property. As a result, the quality of the brazing joint can be easily stabilized.
- FIG. 1 The side view of the brazing furnace in Example 1.
- FIG. 2 The side view of the brazing furnace provided with the some subunit in Example 2 and the cooling chamber.
- FIG. The top view of the to-be-processed material which simulated the parallel flow type heat exchanger in Experimental example 2.
- an inert gas can be used as the inert gas.
- nitrogen gas is usually used from the viewpoint of cost.
- the preheating chamber is preferably configured so that the pressure in the chamber can be 100 Pa or less.
- the pressure in the preheating chamber can be 100 Pa or less.
- the removal of moisture and the like in the preheating can be further promoted.
- the time required for preheating can be further shortened.
- the pressure in the preheating chamber exceeds 100 Pa, the time required for removing moisture and the like becomes longer, and there is a possibility that the productivity is lowered. In some cases, moisture and the like are not sufficiently removed, and the quality of brazing joining may be deteriorated.
- the preheating device is configured so that the temperature of the material to be processed can exceed 200 ° C.
- the preheating by elevating the temperature of the material to be processed to 150 ° C. or higher, evaporation of moisture adsorbed on the jig or the like can be promoted. Further, by heating the material to be processed to a temperature exceeding 200 ° C., removal of oil in addition to moisture can be promoted.
- the heating apparatus may include a plurality of subunits whose temperatures can be individually adjusted, and the plurality of subunits may be arranged along the conveyance direction of the material to be processed.
- the temperature of the material to be processed can be finely controlled. Therefore, for example, the temperature of the material to be processed can be changed stepwise according to the position in the brazing chamber, and high-quality brazing joining can be realized.
- a partition door may be provided between the adjacent subunits so as to be openable and closable.
- the material to be processed disposed between the adjacent partition doors can be heated uniformly using the individual subunits. .
- the brazing furnace has a cooling chamber communicating with the brazing chamber, and the cooling chamber may have a cooling gas introduction device for introducing an inert gas into the chamber.
- the cooling chamber may have a cooling gas introduction device for introducing an inert gas into the chamber.
- the brazing furnace includes brazing of a treated material to which a fluoride-based flux has been applied in advance (flux brazing) and brazing of a treated material to which a fluoride-based flux has not been previously applied (fluxless brazing). ).
- the preheating is more preferably performed by heating the material to be treated to a temperature of 200 ° C. to 400 ° C. or less.
- Zn (zinc) and Mg (magnesium) contained in the aluminum material and the flux may evaporate.
- Zn diffuses by heating during brazing and forms a concentration gradient in the material.
- a sacrificial anode effect can be provided to a to-be-processed material, and the corrosion resistance after brazing can be improved.
- Mg has an effect of improving the brazing property by destroying the natural oxide film on the surface of the aluminum material at the time of brazing. Therefore, if Zn or Mg evaporates, the corrosion resistance after brazing and the brazing property of the material to be treated may be deteriorated.
- the heating temperature in the preheating is 200 ° C. or more and 400 ° C. or less.
- heating temperature exceeds 400 degreeC, evaporation of Zn or Mg can be suppressed by returning to pressure quickly.
- a flux diluted with water can be used. It is preferable that the material to be treated coated with such a flux is fed into the preheating chamber after moisture is dried in advance by a separately prepared drying apparatus. In this case, the drying device and the preheating chamber may be directly connected. Further, it is possible to dry the moisture of the flux in the preheating chamber by installing a water cooling trap or the like in the exhaust line of the preheating chamber.
- the preheating and the brazing are preferably performed in a state where the material to be treated is accommodated in a shielding box made of metal or graphite and having a vent hole.
- the inert gas flows into the shielding box from the vent hole by returning the pressure in the brazing chamber. Since the pressure difference between the inside and outside of the shielding box is almost zero after the return pressure operation, the inert gas atmosphere inside the shielding box is easily maintained.
- a sacrificial oxidant that consumes oxygen in the box is accommodated in the shielding box.
- the oxygen concentration in the shielding box can be further reduced by the action of the sacrificial oxidizing material. Therefore, the quality of the brazing joint can be more easily stabilized.
- the sacrificial oxide material for example, a metal or an alloy thereof having lower free energy than that of the material to be processed can be used. Specific examples thereof include Mg and Mg alloy. Further, Al (aluminum) or Al alloy having the same quality as the material to be treated can be used as the sacrificial oxidation material.
- the form of the sacrificial oxidation material is not particularly limited, and various forms such as a powder form and a plate form can be used.
- the brazing furnace 1 is used for brazing a material to be processed 100 made of an aluminum material.
- the brazing furnace 1 has a preheating chamber 2 and a brazing chamber 3.
- the preheating chamber 2 includes a vacuum pump 21 for depressurizing the interior of the processing material 100 in a state in which the processing target material 100 is accommodated, a preheating device 22 for preheating the processing target material 100 in a reduced pressure atmosphere, and restoring the chamber after preheating.
- a return pressure gas introduction device 23 for introducing an inert gas for pressurization.
- the brazing chamber 3 includes a gas replacement device 31 that introduces an inert gas into the chamber, and a main heating device 32 that heats the workpiece 100 to a brazing temperature.
- the brazing furnace 1 of this example is an external heating furnace in which the preheating device 22 and the main heating device 32 are arranged outside the stainless muffles 24 and 33.
- An intermediate door 25 is provided between the preheating device 22 and the main heating device 32 so as to be openable and closable, and the preheating chamber 2 and the brazing chamber 3 are separated by the intermediate door 25.
- the soaking area dimensions of the preheating chamber 2 and the brazing chamber 3 are a length of 300 mm, a width of 200 mm, and a height of 200 mm, respectively.
- Each of the preheating chamber 2 and the brazing chamber 3 is provided with an endless belt type transport device 11 for transporting the material to be processed 100.
- transfer apparatuses 11 are provided so as to be completely accommodated in the brazing furnace 1 in a state where a front door 261 described later is closed, and a transfer apparatus (illustrated) provided outside the brazing furnace 1 is illustrated. Is omitted. Therefore, it is possible to prevent moisture, oil, and the like from being brought into the furnace by the transfer device provided outside the brazing furnace 1.
- the preheating chamber 2 has an entrance / exit 26 through which the material to be processed 100 is sent and delivered, and a front door 261 is provided at the entrance / exit 26 so as to be opened and closed.
- the preheating chamber 2 is configured so that the pressure in the chamber can be reduced to 0.4 Pa or less by operating the vacuum pump 21 with the front door 261 and the intermediate door 25 closed.
- the indoor pressure can be measured with a Pirani gauge (not shown).
- the vacuum pump 21 is disposed outside the brazing furnace 1, and an exhaust line 211 extending from the vacuum pump 21 communicates with the preheating chamber 2.
- the exhaust line 211 is provided with an exhaust valve 212 that shuts off the vacuum pump 21 and the preheating chamber 2.
- the vacuum pump 21 of this example is an oil rotary pump.
- the recompressed gas introduction device 23 is disposed on a gas supply source 231 disposed outside the brazing furnace 1, a recompressed gas line 232 extending from the gas supply source 231 into the preheating chamber 2, and a recompressed gas line 232.
- the return pressure valve 233 is provided.
- the return pressure gas introduction device 23 is configured to supply nitrogen gas into the preheating chamber 2.
- a gas replacement device 31 for introducing an inert gas into the brazing chamber 3 extends from the gas supply source 231 and the gas supply source 231 disposed outside the brazing furnace 1 and enters the brazing chamber 3. 311 and a replacement valve 312 disposed on the replacement gas line 311.
- the gas replacement device 31 is configured to be able to replace the interior of the chamber with nitrogen gas by always introducing 5 m 3 / h of nitrogen gas into the brazing chamber 3. After the brazing chamber 3 is filled with nitrogen gas, excess nitrogen gas is discharged from a gas escape port (not shown) provided near the intermediate door 25.
- the gas supply source 231 is shared between the return pressure gas introduction device 23 and the gas replacement device 31.
- Brazing furnace 1 can be used as follows, for example. First, the front door 261 is opened and the material to be processed 100 made of an aluminum material is fed into the preheating chamber 2. Next, the front door 261 and the intermediate door 25 are closed. In this state, the vacuum pump 21 is operated to make the inside of the room a reduced pressure atmosphere, and the preheating device 22 is operated to preheat the material to be processed 100.
- the timing for starting the exhaust and the timing for starting the preheating of the workpiece 100 may be the same, or one of them may be the first. From the viewpoint of avoiding unnecessary oxidation of the material to be treated 100, it is preferable to start the exhaust before the start of the preheating.
- the preheating chamber 2 When the pressure in the preheating chamber 2 reaches 100 Pa or less and the temperature of the material to be processed 100 reaches a temperature exceeding 200 ° C., the preheating is completed, the exhaust valve 212 is closed, and then the vacuum pump 21 And the preheating apparatus 22 is stopped. Thereafter, the return pressure valve 233 is opened, and the inside of the preheating chamber 2 is returned to atmospheric pressure with nitrogen gas. Thereby, the circumference
- the return pressure valve 233 is closed, and then the intermediate door 25 is opened. Thereafter, the workpiece 100 is conveyed into the brazing chamber 3 and the intermediate door 25 is closed. Since the brazing chamber 3 is always an inert gas atmosphere, an inert gas atmosphere is maintained around the material to be treated 100 during the conveyance of the material 100 to be treated.
- brazing is performed by heating the material to be treated 100 arranged in the brazing chamber 3 by the heating device 32.
- the intermediate door 25 is opened and the workpiece 100 is conveyed to the preheating chamber 2.
- An inert gas atmosphere is maintained in the preheating chamber 2.
- the material 100 is sent out from the entrance 26. As described above, the workpiece 100 can be brazed.
- the brazing furnace 1 of this example is configured to be able to perform preheating in a reduced pressure atmosphere, return pressure by supplying an inert gas, and brazing in an inert gas atmosphere. Therefore, as described above, when brazing with a reduced amount of flux applied or brazing without using a flux, the storage environment and usage status of the workpiece 100, the jig and the brazing material, the environment outside the furnace, It is possible to suppress the influence of fluctuation or the like on the brazing property. As a result, the quality of the brazing joint can be easily stabilized.
- the brazing furnace 1 can suppress the influence of the storage status of the material 100 to be treated on the brazing property, so that it can be suitably used, for example, in high-temperature and humid areas and seasons. Further, the brazing furnace 1 can realize good brazing even in a working environment where strict management is difficult, such as a storage environment of the workpiece 100 and the jig.
- Example 2 This example is an example of a brazing furnace 1 b including three subunits 32 a, 32 b, 32 c and a cooling chamber 4.
- the main heating device 32 in the brazing furnace 1b of the present example has three subunits 32a to 32c whose temperatures can be individually adjusted.
- the subunits 32a to 32c are arranged along the conveyance direction of the workpiece 100.
- a partition door 35 is provided between the adjacent subunits 32a to 32c so as to be opened and closed.
- the soaking zone dimensions of the three heating zones 36 (36a, 36b, 36c) separated by the partition door 35 are all 300 mm in length, 200 mm in width, and 200 mm in height.
- the replacement gas line 311 of the gas replacement device 31 enters each of the heating zones 36a to 36c.
- the brazing furnace 1 b of this example has a cooling chamber 4 communicating with the brazing chamber 3.
- the brazing furnace 1b feeds the material to be treated 100 from an inlet 27 provided in the preheating chamber 2, and sequentially passes through the preheating chamber 2, the heating zones 36a to 36c, and the cooling chamber 4, and is provided in the cooling chamber 4. Is sent out from the outlet 43. And it is comprised so that the preheating of the to-be-processed material 100, a return pressure, brazing, and cooling can be performed sequentially by letting each chamber pass in said order.
- the cooling chamber 4 has a cooling gas introduction device 41 for introducing an inert gas into the room.
- the brazing chamber 3 and the cooling chamber 4 are separated by a rear door 42 so as to be opened and closed.
- an outlet door 431 is provided at the outlet 43 provided in the cooling chamber 4 so as to be openable and closable in order to prevent air from entering from the outside of the brazing furnace 1.
- a metal curtain or the like may be installed instead of the exit door 431.
- the cooling chamber 4 may be further comprised so that indoor exhaust_gas
- air can be reliably prevented from being mixed into the cooling chamber 4 by exhausting the interior of the cooling chamber 4 and then restoring the pressure with an inert gas.
- a configuration capable of realizing such a function for example, a configuration in which an exhaust line of a vacuum pump enters the room as in the preheating chamber 2 can be considered.
- the cooling gas introduction device 41 is disposed on the cooling gas line 411 and the cooling gas line 411 extending from the gas supply source 231 and the gas supply source 231 disposed outside the brazing furnace 1b and entering the room from the outlet 43 side.
- the cooling valve 412 is provided.
- the cooling gas introduction device 41 is configured to replace the inside of the cooling chamber 4 with nitrogen gas by introducing nitrogen gas from the outlet 43 side of the cooling chamber 4. After the inside of the cooling chamber 4 is filled with nitrogen gas, excess nitrogen gas is discharged from a gas escape port (not shown) provided in the vicinity of the rear door 42.
- the gas supply source 231 is shared among the decompression gas introduction device 23, the gas replacement device 31, and the cooling gas introduction device 41. Others are the same as in the first embodiment.
- the same reference numerals as those used in the first embodiment represent the same components as in the first embodiment unless otherwise specified.
- the main heating device 32 in the brazing furnace 1b of this example has a plurality of subunits 32a to 32c whose temperatures can be individually adjusted, and the plurality of subunits 32a to 32c are arranged in the conveying direction of the workpiece 100. Are arranged along.
- a partition door 35 is provided between the adjacent subunits 32a to 32c so as to be opened and closed. Therefore, the heating temperature of the material to be processed 100 can be changed stepwise for each of the heating zones 36a to 36c separated by the partition door 35. Further, by heating the partition door 35 in a closed state, the workpiece 100 can be heated uniformly in the individual heating zones 36a to 36c. As a result, the brazing quality can be further improved.
- Example 1 In this example, a brazing test was performed using the brazing furnace 1 of the first embodiment.
- production conditions were variously changed, and 12 types of honeycomb panels (test bodies E1 to E6 and test bodies C1 to C6) were produced.
- the configuration of the workpiece 101 and the experimental method will be described below.
- the material to be treated 101 of this example includes a rectangular frame portion 51 composed of four hollow extruded shapes 511, a honeycomb core 52 disposed inside the frame portion 51, and It has a face plate (not shown) that sandwiches the frame portion 51 and the honeycomb core 52 from above and below. After assembling these into a predetermined shape (see FIG. 4), a honeycomb panel can be manufactured by brazing.
- the outer dimension in the long side direction (length direction) of the frame 51 is 260 mm, and the outer dimension in the short side (width direction) is 180 mm.
- the hollow extruded shape member 511 constituting the frame portion 51 is made of JIS A 6063 aluminum alloy, and the outer dimension of the cross section perpendicular to the longitudinal direction is 30 mm ⁇ 30 mm.
- the pair of hollow extruded shapes 511 a constituting the short sides of the frame portion 51 have a vent hole 512 having a diameter of 3 mm at the center thereof, and the vent holes 512. It is comprised so that the exhaust_gas
- the honeycomb core 52 is configured by arranging a plurality of core members 521, and as shown in FIG. 3, hexagonal columnar cells 522 are formed by adjacent core members 521.
- the core member 521 is manufactured by corrugating a bare plate made of JIS A 6951 aluminum alloy.
- the height of the honeycomb core 52 is 30 mm, and the size of the cell 522 is 30 mm.
- Each cell 522 has two through holes (not shown) having a diameter of 1 mm, and is configured such that each cell 522 can be evacuated and decompressed through the through holes.
- the honeycomb core 52 of the test bodies E1 to E6 and C1 to C5 was provided with a core member 521 that had not been degreased.
- the honeycomb core 52 of the test body C6 was provided with a core member 521 that had been previously degreased using acetone.
- the face plate is composed of a core material and a brazing material clad with a cladding rate of 10% on one side of the core material, and has a thickness of 1 mm.
- the core of the face plate is made of JIS A 6951 aluminum alloy, and the brazing material is made of aluminum alloy having a chemical component of Al-10% Si-0.02% Bi.
- the jig of this example is an isotropic graphite plate 53 having a thickness of 10 mm.
- 30 cc of water was sprayed on the entire surface of the isotropic graphite plate 53 using a mist spray and left at room temperature for 18 hours.
- the material to be treated 101 was sandwiched between a pair of isotropic graphite plates 53 that had been subjected to the above-described treatment in advance as shown in FIG.
- preheating and brazing were performed using the brazing furnace 1 of Example 1.
- the room exhaust and preheating were started immediately.
- Control of the indoor pressure and the heating temperature of the material to be processed 101 was performed as follows. After the pressure in the preheating chamber 2 reaches the value shown in Table 1, the indoor pressure is adjusted so that the exhaust valve 212 is manually operated to adjust the degree of opening and closing so that the pressure is substantially constant until the preheating is completed. Controlled.
- the temperature of the furnace wall of the preheating chamber 2 and the material to be processed 101 stay in the room. Controlled by time. Specifically, the preheating device 22 was controlled to set the temperature of the furnace wall of the preheating chamber 2 to the value shown in Table 1, and in this state, the workpiece 101 was allowed to stay in the room for 20 minutes. Note that it is confirmed in advance that the temperature of the workpiece 101 rises to a range of ⁇ 5 to 0 ° C. based on the temperature of the furnace wall of the preheating chamber 2 by performing the preheating in this way.
- thermocouple was inserted from the ceiling portion of the brazing chamber 3 to be brought into contact with the material to be processed 101, and the material to be processed 101 was heated by the main heating device 32 while measuring its temperature. When the temperature of the workpiece 101 reached 600 ° C., the heating was finished.
- the thermocouple for temperature measurement is inserted from the ceiling portion of the brazing chamber 3, but it is also possible to insert the thermocouple from the side surface of the brazing chamber 3.
- the material to be treated 101 was transported to the preheating chamber 2 and cooled in a nitrogen atmosphere, and then taken out from the entrance / exit 26 to the outside of the furnace.
- the brazing was completed as described above to obtain a honeycomb panel.
- the joining state of the honeycomb core 52 and a face plate and the joining state of the frame part 51 and a face plate were evaluated by ultrasonic inspection.
- the center of the test body was cut and the joined state of the core members 521 constituting the honeycomb core 52 was visually evaluated.
- test bodies E1 to E6 As is known from Table 1, all of the test bodies E1 to E6 that were preheated in a reduced pressure atmosphere, supplied with an inert gas, and brazed in an inert gas atmosphere had a good bonding state. It was. Among the test bodies E1 to E6, the test bodies E1 and E4 in which the pressure in the preheating chamber 2 was lowered were particularly good in the joined state between the frame portion 51 and the face plate. Since the test bodies E2, E3, E5, and E6 have a higher pressure in the preheating chamber 2 than the test bodies E1 and E4, there is a small unjoined portion in the vicinity of the outer periphery of the joint portion between the frame portion 51 and the face plate. Been formed. These minute unjoined portions were not problematic in practical use, and the joined state was good.
- the joined state between the core members 521 was particularly good.
- the test bodies E4 to E6 since the set temperature of the preheating chamber 2 was lower than that of the test bodies E1 to E3, a portion having a non-uniform fillet shape was observed.
- the fillet shapes of the test specimens E4 to E6 are not practically problematic, and the bonding state is good.
- the test body C1 in which the pressure in the preheating chamber 2 was set to 180 Pa had a poor joined state between the frame portion 51 and the face plate, and an unjoined portion was formed. In addition, a lot of fillet breakage occurred at the joints between the core members 521, resulting in poor joints. This bonding failure is considered to be caused by an increase in the oxygen concentration and dew point in the chamber due mainly to the influence of moisture release from the jig in the brazing chamber 3.
- the test body C2 in which the temperature of the preheating chamber 2 was 140 ° C. had a poor bonding state between the frame portion 51 and the face plate, and an unbonded portion was formed. Moreover, the fillet was hardly formed about the junction part of core members 521. Since the temperature of the material 101 to be processed when the temperature of the preheating chamber 2 is 140 ° C. is estimated to reach about 135 to 140 ° C., these poor joints are caused by the oil content of the core member 521 due to insufficient preheating. This is considered to be caused by the fact that it was not completely removed and as a result, the wettability of the wax was lowered.
- test body C3 in which both the pressure and the temperature of the preheating chamber 2 were in adverse conditions was worse in the joining state than the test body C2.
- the fillet was hardly formed in the specimen C4 that was not preheated and the specimen C5 that was not preheated and depressurized.
- the joined state between the honeycomb core 52 and the face plate and the joined state between the core members 521 were relatively good, but the joined state between the frame portion 51 and the face plate was It was bad and the bonding was poor. From this, in the brazing of the test body C6, it can be understood that the joining state of the core members 521 is improved by removing the oil content of the core member 521. On the other hand, it is presumed that the joining state between the frame portion 51 and the face plate was not improved because the moisture from the jig could not be removed because the temperature of the preheating chamber 2 was set to 140 ° C.
- Example 2 In this example, a brazing test of a mini-core simulating a parallel flow heat exchanger is performed.
- production conditions were variously changed as shown in Table 2 to produce 12 types of minicores (test bodies E11 to E16 and test bodies C11 to C16). The configuration of the workpiece 102 and the experiment method will be described below.
- the material 102 to be processed in this example includes a pair of headers 61, five extruded tubes 62 inserted through the header 61 in a state of being arranged in parallel with each other, and adjacent extruded tubes 62. And corrugated outer fins 63 disposed on the surface.
- a mini-core can be produced by brazing.
- the obtained mini-core has a dimension in the longitudinal direction (length direction) of the extruded tube 62 of 260 mm and a dimension in the arrangement direction (width direction) of 180 mm.
- the extruded tube 62 is composed of JIS A 1000 series aluminum, and is a multi-hole tube in which the inside of the tube is partitioned into a plurality of flow paths by partition walls.
- the test bodies E11 to E16 and C11 to C15 were provided with extruded tubes 62 that had not been degreased.
- the test body C16 was provided with an extruded tube 62 that had been degreased with acetone in advance.
- the header 61 is made of a core material and a brazing material clad with a cladding rate of 5% on each side of the core material, and has a thickness of 1.2 mm.
- the core material of the header 61 is made of JIS A 3003 aluminum alloy, and the brazing material is made of JIS A 4343 aluminum alloy.
- the header 61 has a through hole (not shown) for inserting the extruded tube 62.
- the outer fin 63 is composed of a core material and a brazing material clad with a cladding rate of 10% on both surfaces of the core material, and has a thickness of 0.1 mm.
- the core material of the outer fin 63 is made of JIS A 3003 aluminum alloy, and the brazing material is made of JIS A 4045 aluminum alloy.
- the header 61 and the outer fin 63 were subjected to a degreasing process using acetone, and then subjected to the assembly of the workpiece 102 in a state where the amount of flux shown in Table 2 was applied in advance.
- the flux application amount was calculated by subtracting the mass of the header 61 and the outer fin 63 measured in advance before the flux application from the mass of the header 61 and the outer fin 63 after the flux application and drying.
- preheating and brazing were performed using the brazing furnace 1 of Example 1.
- the procedure of brazing is the same as that of Experimental Example 1 except that the pressure in the preheating chamber 2 is changed to the conditions shown in Table 2.
- tube 62 and the outer fin 63 were evaluated visually. The results are shown in Table 2.
- the specimens E14 to E16 have a lower temperature in the preheating chamber 2 than the specimens E11 to E13.
- the outer fin 63 of 2 g / m 2 there is a practical problem. It was possible to realize a joined state without any.
- the test body C12 in which the same amount of flux as that of the test bodies E14 to E16 is applied and the temperature of the preheating chamber 2 is 140 ° C., is a joint between the header 61 and the extruded tube 62 and between the extruded tube 62 and the outer fin 63. Fillet breakage occurred at both joints, resulting in poor joints. It is estimated that the temperature of the material 102 to be processed when the temperature of the preheating chamber 2 is 140 ° C. has reached about 135 to 140 ° C. Therefore, the above-mentioned poor bonding is considered to be caused by the fact that the oil content in the extruded tube 62 could not be completely removed in addition to the increase in indoor oxygen concentration and dew point.
- test body C15 aimed at 5 g / m 2 which is larger than the standard amount of flux application, but the joint between the header 61 and the extruded tube 62 and the joint between the extruded tube 62 and the outer fin 63. There were frequent fillet cuts in both departments.
- the joined state between the extruded tube 62 and the outer fin 63 was relatively good, but the joined state between the header 61 and the extruded tube 62 was poor. From this, in the brazing of the test body C16, it can be understood that the joining state of the extruded tube 62 and the outer fin 63 is improved by removing the oil content of the extruded tube 62. On the other hand, since the oxygen concentration and dew point in the brazing chamber 3 are high, it is presumed that the joining state of the header 61 and the extruded tube 62 has deteriorated.
- Example 3 In this example, a mini-core brazing test simulating a hollow heat exchanger was performed. In this example, as shown in Table 3, production conditions were variously changed to produce 20 types of minicores (test bodies E21 to E32 and test bodies C21 to C28). The configuration of the material to be processed 103 and the experimental method will be described below.
- the material 103 to be processed includes a pair of cup portions 71 formed in a square cup shape and corrugated inner fins 72.
- a flange portion 711 is provided on the outer peripheral edge of the cup portion 71, and the pair of cup portions 71 are arranged so that the flange portions 711 come into contact with each other.
- the inner fin 72 is disposed in an internal space formed between the pair of cup portions 71.
- a mini-core After assembling the pair of cup parts 71 and the inner fins 72 into a predetermined shape (see FIG. 6), a mini-core can be manufactured by brazing.
- the resulting minicore has outer dimensions of length 50 mm, width 50 mm and thickness 10 mm.
- the cup portion 71 is composed of a core material and a brazing material clad at a cladding rate of 10% on both surfaces of the core material, and has a thickness of 0.6 mm.
- the core material of the cup portion 71 is made of JIS A 6951 aluminum alloy, and the brazing material is made of an aluminum alloy having a chemical composition of Al-10% Si-0.03% Bi.
- the inner fin 72 is made of JIS A 3003 aluminum alloy and has a thickness of 0.1 mm.
- the cup part 71 and the inner fin 72 were subjected to a degreasing process using acetone in advance and then subjected to assembly.
- ⁇ Experiment method> After assembling the material to be processed 103 into a predetermined shape, these were fixed using a jig.
- the jig of this example is a stainless plate 73 having a thickness of 3 mm.
- the material to be processed 103 was sandwiched between a pair of stainless steel plates 73, and these were clamped with a stainless steel wire (not shown) to fix the material to be processed 103.
- the material 103 to be processed fixed to the stainless steel plate 73 was accommodated in the shielding box 8 (see FIG. 7).
- the shielding box 8 is made of stainless steel (SUS304), aluminum alloy (A5052), or isotropic graphite, and has four ventilation holes 81 having a diameter of 3 mm.
- a sacrificial oxide material 82 was further accommodated inside the shielding box 8. As shown in Table 3, in the brazing of the test body E30, 0.5 g of cutting waste sacrificial oxide material 82 made of pure Mg was placed inside the shielding box 8. In the brazing of the test body E31, 0.5 g of a cutting waste sacrificial oxide material 82 made of an Al-35% Mg alloy was placed inside the shielding box 8. In the brazing of the test body E32, two sacrificial oxidation materials 82 made of JIS A 5052 aluminum alloy plate were installed inside the shielding box 8. The aluminum alloy plate had a length of 40 mm, a width of 10 mm and a thickness of 1 mm, and the mass per sheet was 1 g.
- preheating and brazing were performed using the brazing furnace 1 of Example 1.
- the procedure of brazing is the same as that of Experimental Example 1 except that the pressure in the preheating chamber 2 is changed to the conditions shown in Table 3.
- the center of each specimen after brazing is cut, the fillet formation state on the outer side (see FIG. 6, 712) of the flange portion 711, the fillet formation state on the inner side (see FIG. 6, 713), and the cup portion 71.
- the formation state of the fillet between the inner fin 72 and the inner fin 72 was visually evaluated. The results are shown in Table 3.
- test bodies E21 to E32 that had been preheated in a reduced-pressure atmosphere, supplied with an inert gas, and brazed in an inert gas atmosphere had a good bonding state. It was.
- the specimens E27 to E32 that were preheated and brazed while the workpiece 103 was accommodated in the shielding box 8 were compared to the specimens E21 to E26 that were brazed without using the shielding box 8.
- the fillet formation state on the outer side of the flange portion 711 was better.
- the test bodies E21 to E26 were joined with no problem in practical use, although the fillet formation state on the outside of the flange portion 711 was slightly inferior to the test bodies E27 to E32.
- the specimens E30 to E32 that have been brazed while the sacrificial oxide material 82 is housed in the shielding box 8 have a flange portion compared to the specimens E27 to E29 that have been brazed without using the sacrificial oxide material 82.
- the fillet formed on the outside of 711 became larger. From this, it can be understood that the oxygen concentration in the shielding box 8 can be reduced by the action of the sacrificial oxidant 82, and as a result, the wettability of the wax outside the flange portion 711 is improved.
- test body C23 in which both the pressure and temperature of the preheating chamber 2 are in bad conditions and the test body C24 in which the preheating is not performed have worse fillet formation in both the inside and outside of the minicore than the test body C22. .
- the formation state of the fillet was improved as compared with the test body C24 in which only the pressure reduction of the preheating chamber 2 was performed.
- fillet breakage occurred on the outer side of the flange portion 711, resulting in poor bonding, so that it did not reach a level where there was no practical problem.
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Abstract
Description
(1)成形加工により被処理材に付着した油分
(2)ろう付に用いる治具に吸着している水分及び油分
(3)ろう付に用いる治具に付着している異物 As described above, the conventional technique has a problem that it is difficult to stabilize the quality of brazing joint in brazing with a reduced amount of flux applied or brazing without using flux. As a result of further investigations based on the above background, the inventors focused on the fact that the following three points can be factors that deteriorate brazing.
(1) Oil adhering to the material to be processed by molding (2) Moisture and oil adsorbed on the jig used for brazing (3) Foreign matter adhering to the jig used for brazing
予備加熱室とろう付室とを有し、
上記予備加熱室は、上記被処理材を収容した状態で室内を減圧するための真空ポンプと、減圧雰囲気下において上記被処理材を予備加熱する予備加熱装置と、予備加熱後に室内を復圧するための不活性ガスを導入する復圧ガス導入装置とを有し、
上記ろう付室は、室内に不活性ガスを導入するガス置換装置と、上記被処理材をろう付温度に加熱する本加熱装置とを有している、ろう付炉にある。 One aspect of the present invention is a brazing furnace used for brazing a material to be treated made of an aluminum material,
A preheating chamber and a brazing chamber;
The preheating chamber includes a vacuum pump for depressurizing the chamber in a state in which the material to be treated is accommodated, a preheating device for preheating the material to be treated in a decompressed atmosphere, and a pressure relief chamber after the preheating. A return pressure gas introduction device for introducing the inert gas of
The brazing chamber is a brazing furnace having a gas replacement device for introducing an inert gas into the chamber and a main heating device for heating the material to be treated to a brazing temperature.
次いで、不活性ガスを供給することにより上記被処理材の周囲を不活性ガス雰囲気にし、
その後、上記不活性ガス雰囲気を維持した状態で上記被処理材を加熱してろう付を行う、アルミニウム材のろう付方法にある。 In another aspect of the present invention, a material to be treated made of an aluminum material is preheated under a reduced pressure atmosphere of 100 Pa or less,
Next, by supplying an inert gas, the periphery of the material to be treated is made an inert gas atmosphere,
Then, it is in the brazing method of the aluminum material which brazes by heating the said to-be-processed material in the state which maintained the said inert gas atmosphere.
上記ろう付炉及びろう付方法の実施例について、図を用いて説明する。図1に示すように、ろう付炉1は、アルミニウム材よりなる被処理材100のろう付に用いられる。ろう付炉1は予備加熱室2とろう付室3とを有している。予備加熱室2は、被処理材100を収容した状態で室内を減圧するための真空ポンプ21と、減圧雰囲気下において被処理材100を予備加熱する予備加熱装置22と、予備加熱後に室内を復圧するための不活性ガスを導入する復圧ガス導入装置23とを有している。ろう付室3は、室内に不活性ガスを導入するガス置換装置31と、被処理材100をろう付温度に加熱する本加熱装置32とを有している。 (Example 1)
Examples of the brazing furnace and the brazing method will be described with reference to the drawings. As shown in FIG. 1, the
本例は、3つのサブユニット32a、32b、32c及び冷却室4を備えたろう付炉1bの例である。図2に示すように、本例のろう付炉1bにおける本加熱装置32は、個別に温度を調整可能な3つのサブユニット32a~32cを有している。サブユニット32a~32cは、被処理材100の搬送方向に沿って配置されている。また、隣り合うサブユニット32a~32cの間には、仕切り扉35が開閉可能に設けられている。本例において、仕切り扉35により隔てられた3つの加熱ゾーン36(36a、36b、36c)の均熱域寸法は、いずれも長さ300mm、幅200mm及び高さ200mmである。また、個々の加熱ゾーン36a~36cには、ガス置換装置31の置換ガスライン311が進入している。 (Example 2)
This example is an example of a
本例は、実施例1のろう付炉1を用いてろう付試験を行った例である。本例においては、表1に示すように製造条件を種々変更し、12種類のハニカムパネル(試験体E1~E6及び試験体C1~C6)を作製した。被処理材101の構成及び実験方法を以下に説明する。 (Experimental example 1)
In this example, a brazing test was performed using the
本例の被処理材101は、図3に示すように、4本の中空押出形材511から構成された長方形状の枠部51と、枠部51の内側に配置されるハニカムコア52と、枠部51及びハニカムコア52を上下両面から挟む面板(不図示)とを有している。これらを所定の形状(図4参照)に組み立てた後、ろう付を行うことによりハニカムパネルを作製することができる。 <Material to be treated 101>
As shown in FIG. 3, the material to be treated 101 of this example includes a
上記の被処理材101を所定の形状に組み立てた後、治具を用いてこれらを固定した。本例の治具は、厚さ10mmの等方性黒鉛板53である。治具を高湿環境下で保管した状態を模擬するために、等方性黒鉛板53の全面に霧吹きを用いて30ccの水を吹きかけ、室温で18時間放置した。予め上記の処理を行った一対の等方性黒鉛板53の間に、図4に示すように被処理材101を挟み込み、これらをステンレス線54で締め付けることにより、被処理材101を固定した。 <Experiment method>
After assembling the material to be processed 101 into a predetermined shape, these were fixed using a jig. The jig of this example is an
・ハニカムコア52と面板との接合状態
A+:極めて良好
A:一部にフィレット形状が不均一な部分があるが、良好
B:フィレットが形成されていない部分が存在する
C:フィレットが形成されていない部分が比較的多く存在する
D:フィレットが形成されていない部分が多い In addition, the meaning of the symbol described in the column of the evaluation result in Table 1 is as follows.
-Joined state of the
A+:極めて良好
A:微小な未接合部分が存在するが、良好
B:未接合部分が存在する
C:未接合部分が多い
D:ほとんど全面が接合されていない -Joining state of the
A+:極めて良好
A:一部にフィレット形状が不均一な部分があるが、良好
B:フィレットが形成されていない部分が存在する
C:フィレットがほとんど形成されていない -Joining state between the core members 521 A +: Extremely good A: There are portions where the fillet shape is non-uniform, but good B: There are portions where no fillets are formed C: Little fillets are formed
本例は、パラレルフロー型熱交換器を模擬したミニコアのろう付試験を行った例である。本例においては、表2に示すように製造条件を種々変更し、12種類のミニコア(試験体E11~E16及び試験体C11~C16)を作製した。被処理材102の構成及び実験方法を以下に説明する。 (Experimental example 2)
In this example, a brazing test of a mini-core simulating a parallel flow heat exchanger is performed. In this example, production conditions were variously changed as shown in Table 2 to produce 12 types of minicores (test bodies E11 to E16 and test bodies C11 to C16). The configuration of the
本例の被処理材102は、図5に示すように、一対のヘッダ61と、互いに平行に並んだ状態でヘッダ61に挿通される5本の押出管62と、隣り合う押出管62の間に配置されるコルゲート形状のアウターフィン63とを有している。これらを所定の形状に組み立てた後、ろう付を行うことによりミニコアを作製することができる。得られるミニコアは、押出管62の長手方向(長さ方向)における寸法が260mmであり、並び方向(幅方向)における寸法が180mmである。 <
As shown in FIG. 5, the
上記の被処理材102を所定の形状に組み立てた後、図5に示すように、ステンレス線64を用いて押出管62及びアウターフィン63を幅方向に締め付けることにより、被処理材102を固定した。 <Experiment method>
After assembling the
A+:極めて良好
A:一部にフィレット形状が不均一な部分があるが、良好
B:フィレットが形成されていない部分が存在する
C:フィレットが形成されていない部分が多く存在する In addition, the meaning of the symbol described in the column of the evaluation result in Table 2 is as follows.
A +: Extremely good A: There are portions where the fillet shape is not uniform, but good B: There are portions where the fillet is not formed C: There are many portions where the fillet is not formed
本例は、中空型熱交換器を模擬したミニコアのろう付試験を行った例である。本例においては、表3に示すように製造条件を種々変更し、20種類のミニコア(試験体E21~E32及び試験体C21~C28)を作製した。被処理材103の構成及び実験方法を以下に説明する。 (Experimental example 3)
In this example, a mini-core brazing test simulating a hollow heat exchanger was performed. In this example, as shown in Table 3, production conditions were variously changed to produce 20 types of minicores (test bodies E21 to E32 and test bodies C21 to C28). The configuration of the material to be processed 103 and the experimental method will be described below.
本例の被処理材103は、図6及び図7に示すように、角型カップ状に成形された一対のカップ部71と、コルゲート形状のインナーフィン72とを有している。カップ部71の外周端縁にはフランジ部711が設けられており、一対のカップ部71は、フランジ部711が互いに当接するように配置される。また、インナーフィン72は、一対のカップ部71の間に形成される内部空間に配置される。 <
As shown in FIGS. 6 and 7, the
上記の被処理材103を所定の形状に組み立てた後、治具を用いてこれらを固定した。本例の治具は、厚さ3mmのステンレス板73である。図6に示すように、一対のステンレス板73の間に被処理材103を挟み込み、これらをステンレス線(不図示)で締め付けることにより、被処理材103を固定した。 <Experiment method>
After assembling the material to be processed 103 into a predetermined shape, these were fixed using a jig. The jig of this example is a
A+:極めて良好
A:一部にフィレット形状が不均一な部分があるが、良好
B:フィレットが形成されていない部分が存在する
C:フィレットが形成されていない部分が多く存在する
D:フィレットが全く形成されていない In addition, the meaning of the symbol described in the column of the evaluation result in Table 3 is as follows.
A +: Extremely good A: There is a portion where the fillet shape is not uniform, but it is good B: There are portions where the fillet is not formed C: Many portions where the fillet is not formed D: Fillet Not formed at all
Claims (13)
- アルミニウム材よりなる被処理材のろう付に用いられるろう付炉であって、
予備加熱室とろう付室とを有し、
上記予備加熱室は、上記被処理材を収容した状態で室内を減圧するための真空ポンプと、減圧雰囲気下において上記被処理材を予備加熱する予備加熱装置と、予備加熱後に室内を復圧するための不活性ガスを導入する復圧ガス導入装置とを有し、
上記ろう付室は、室内に不活性ガスを導入するガス置換装置と、上記被処理材をろう付温度に加熱する本加熱装置とを有している、ろう付炉。 A brazing furnace used for brazing a material to be treated made of an aluminum material,
A preheating chamber and a brazing chamber;
The preheating chamber includes a vacuum pump for depressurizing the chamber in a state in which the material to be treated is accommodated, a preheating device for preheating the material to be treated in a decompressed atmosphere, and a pressure relief chamber after the preheating. A return pressure gas introduction device for introducing the inert gas of
The brazing chamber is a brazing furnace having a gas displacement device for introducing an inert gas into the chamber and a main heating device for heating the material to be treated to a brazing temperature. - 上記予備加熱室は、室内の圧力を100Pa以下にすることができるように構成されている、請求項1に記載のろう付炉。 The brazing furnace according to claim 1, wherein the preheating chamber is configured so that the pressure in the chamber can be 100 Pa or less.
- 上記予備加熱装置は、上記被処理材の温度を200℃超にすることができるように構成されている、請求項1または2に記載のろう付炉。 The brazing furnace according to claim 1 or 2, wherein the preheating device is configured so that the temperature of the material to be processed can be increased to more than 200 ° C.
- 上記本加熱装置は、個別に温度を調整可能な複数のサブユニットを有しており、該複数のサブユニットが上記被処理材の搬送方向に沿って配置されている、請求項1~3のいずれか1項に記載のろう付炉。 The heating apparatus according to any one of claims 1 to 3, further comprising a plurality of subunits whose temperatures can be individually adjusted, wherein the plurality of subunits are arranged along a conveying direction of the material to be processed. The brazing furnace according to any one of the above.
- 上記ろう付炉は、上記ろう付室に連通する冷却室を有しており、該冷却室は、室内に不活性ガスを導入する冷却ガス導入装置を有している、請求項1~4のいずれか1項に記載のろう付炉。 The brazing furnace has a cooling chamber communicating with the brazing chamber, and the cooling chamber has a cooling gas introducing device for introducing an inert gas into the chamber. The brazing furnace according to any one of the above.
- 上記ろう付炉は、上記被処理材を入口から出口まで搬送する搬送装置を有している、請求項1~5のいずれか1項に記載のろう付炉。 The brazing furnace according to any one of claims 1 to 5, wherein the brazing furnace has a conveying device for conveying the material to be treated from an inlet to an outlet.
- アルミニウム材よりなる被処理材を100Pa以下の減圧雰囲気下において予備加熱し、
次いで、不活性ガスを供給することにより上記被処理材の周囲を不活性ガス雰囲気にし、
その後、上記不活性ガス雰囲気を維持した状態で上記被処理材を加熱してろう付を行う、アルミニウム材のろう付方法。 Preheating the material to be treated made of an aluminum material under a reduced pressure atmosphere of 100 Pa or less,
Next, by supplying an inert gas, the periphery of the material to be treated is made an inert gas atmosphere,
Then, the brazing method of the aluminum material which brazes by heating the said to-be-processed material in the state which maintained the said inert gas atmosphere. - 上記予備加熱は、上記被処理材を200℃超え400℃以下の温度に加熱して行う、請求項7に記載のアルミニウム材のろう付方法。 The aluminum material brazing method according to claim 7, wherein the preheating is performed by heating the material to be treated to a temperature of 200 ° C to 400 ° C.
- 上記被処理材は、ろう付を行う部分に予めフッ化物系フラックスが塗布されている、請求項7または8に記載のアルミニウム材のろう付方法。 The aluminum material brazing method according to claim 7 or 8, wherein the material to be treated is preliminarily coated with a fluoride-based flux on a portion to be brazed.
- 上記被処理材は、ろう付を行う部分に予めフッ化物系フラックスが塗布されていない、請求項7または8に記載のアルミニウム材のろう付方法。 The aluminum material brazing method according to claim 7 or 8, wherein the material to be treated is not preliminarily coated with a fluoride-based flux on a portion to be brazed.
- 上記予備加熱及び上記ろう付は、金属または黒鉛よりなり通気孔を有する遮蔽箱に上記被処理材を収容した状態で行われる、請求項10に記載のアルミニウム材のろう付方法。 The method for brazing an aluminum material according to claim 10, wherein the preheating and the brazing are performed in a state where the material to be treated is accommodated in a shielding box made of metal or graphite and having a vent hole.
- 上記遮蔽箱には、さらに、箱内の酸素を消費する犠牲酸化材が収容されている、請求項11に記載のアルミニウム材のろう付方法。 12. The aluminum material brazing method according to claim 11, wherein the shielding box further contains a sacrificial oxidizing material that consumes oxygen in the box.
- 請求項1~6のいずれか1項に記載のろう付炉を用いてろう付を行う、請求項7~12のいずれか1項に記載のアルミニウム材のろう付方法。 The method for brazing an aluminum material according to any one of claims 7 to 12, wherein brazing is performed using the brazing furnace according to any one of claims 1 to 6.
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CN109732169B (en) * | 2019-02-22 | 2021-04-06 | 常州爱克普换热器有限公司 | Vacuum brazing equipment of plate-fin heat exchanger |
CN111375857B (en) * | 2020-04-10 | 2021-12-17 | 柳州市易昇热导技术有限公司 | Brazing method of double-layer composite water tank |
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