JPH07115165B2 - Vacuum brazing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a vacuum brazing apparatus,
Particularly, it relates to a vacuum brazing apparatus provided with an Mg trap mechanism.

[0002]

2. Description of the Related Art For example, as shown in FIG. 7, in a conventional Mg brazing mechanism of a vacuum brazing apparatus 40, an exhaust port 46 provided on the lower surface of a vacuum chamber 41 and a main valve 47 are provided. Is provided with a trap area 44,
The Mg trap 45 was arranged near the main valve 47.

When the inside of the vacuum chamber 41 of the vacuum brazing apparatus 40 having this structure is heated by the heaters 42a and 42b to perform the brazing operation, Mg released from the brazing material during brazing drives the vacuum pump 48. As a result, the Mg trap 45 flies to the trap region 44 together with the gas flow a exhausted from the exhaust port 46 and is captured by the Mg trap 45. However, the Mg trap 45 is provided at a position apart from the vacuum chamber 41. Therefore, Mg adheres to the inner wall surface of the vacuum chamber 41 and other components, and the trapping efficiency cannot be sufficiently improved. By the way, a vacuum brazing apparatus in which an Mg trap and a heater are provided close to each other has also been invented (Japanese Patent Publication No. 57-17630), but the vacuum brazing apparatus 50 shown in FIG. A trap region 52 is formed by extending 51 in the forward direction b of the arrow and connecting to the front end thereof, and a plurality of Mg traps 57 having a reflector structure are provided on the inner wall of the trap region 52 with a pair of left and right pins 58. It has a structure in which it is hung on a wall and is detachably arranged. With this configuration, when the carrier 55 having the objects to be brazed loaded in the heating chamber 51 is carried along the transport path 56, the heater 53 is heated to perform the brazing operation. The Mg evaporated at this time is a plurality of Mg traps 57.
Captured by. However, since the Mg trap is of a cooling type in this configuration, the desired surface temperature for capturing Mg may not be obtained due to the difference in the operating time of the device or the set temperature, and Mg may not adhere much. .

On the other hand, according to the experimental data, 4 in the vacuum chamber
Mg does not adhere to the inner wall surface and other components above 00 ° C,
If it is less than this, Mg adhesion and growth are observed in each part in the vacuum chamber. If the amount of Mg in the vacuum chamber is small, no problem will occur, but if it grows, the following problems will occur. For example, if Mg adheres to the electrode part, it causes insulation deterioration and discharge trouble occurs, and if it adheres to the transfer system, the brazed object cannot be transferred normally,
If it is a continuous furnace, it adheres to the partition valve that partitions the chamber, causing defective opening and closing operations and defective vacuum sealing. For this reason, it is necessary to carry out the removal work while the amount of Mg adhering in the vacuum tank is small, which leads to a decrease in the operating rate of the vacuum brazing device and an increase in the number of maintenances, which leads to a reduction in the running cost. It was an obstacle.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a vacuum brazing apparatus in which Mg is efficiently captured by the Mg trap mechanism and almost no Mg adheres to other components. The purpose is to provide.

[0006]

Further objects Means for Solving the problems] is wax
The brazed object with the material attached is heated in an evacuated heating chamber.
In a vacuum brazing apparatus adapted to braze the brazing material by heating, transfer the brazing material to the heating chamber.
Heat reflector means provided so as not to interfere with movement
The heating chamber is provided with a heater area and at least both ends thereof.
Part of the trap area and
M having a cooling surface cooled to 400 ° C. or less with a cooling medium
This is achieved by a vacuum brazing device characterized by having a g-trap mechanism.

[0007]

[ Function ] The heating chamber is heated by the heat reflector means.
The trap area is divided into the data area and the trap area.
Mg trap having a cooling surface cooled in a region by a cooling medium
Since a mechanism is provided, the cooling surface of the trap area should be 400 ° C or more.
It can be cooled down, and Mg evaporated from the brazing material during brazing is efficiently captured by this Mg trap mechanism without adhering to other parts. Therefore, it is possible to greatly reduce the maintenance cost as compared with the related art.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A vacuum brazing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment and shows a main part of a vacuum brazing apparatus in a continuous furnace having a heating chamber A, a preheating chamber B and an extraction chamber C. The heating chamber A includes a heater region 1 and trap regions 2a and 2b, and the preheating chamber B and the take-out chamber C are airtightly closed by open / close sluice valves 4a and 4b. Heaters 3a, 3a ', 3b, 3b', 3c, 3c 'are provided separately on the side wall of the heater region 1 in the front-rear direction. Heater 3
a, 3a ', 3b, 3b', 3c, 3c 'allow the temperature to be adjusted separately (this is, for example, the earlier application of one of the applicants, Japanese Patent Application No. 1-246085.
Controlled by the method disclosed in No. Further, the reflectors 11a, 11a ', 11b, 11b', 11 are provided behind the heaters 3a, 3a ', 3b, 3b', 3c, 3c ', that is, between the side walls of the heater region 1.
c, 11c 'are provided and heaters 3a, 3a', 3b, 3
The heat of b ', 3c, 3c' is reflected on the brazed object 7.

A trap area 2a located on the side of the take-out chamber C
The cooling medium circulation pipe 10a for cooling water circulation,
That is, the Mg trap mechanism 5a is supplied and drained.
Is provided and the surface temperature thereof is set to a desired temperature of 400 ° C. or lower (this is achieved by attaching a temperature sensor to the Mg trap mechanism, not shown, and adjusting the circulation speed of the cooling water. it can). An annular end reflector 6a is provided on the inner wall of the boundary between the trap region 2a and the heater region 1 so as not to hinder the movement of the carrier frame 8, while the trap region 2b located on the preheating chamber B side is provided. Similarly, a Mg trap mechanism 5b for circulating, that is, supplying and draining the cooling water by the cooling medium circulation pipe 10b is arranged in the same manner, and an annular end reflector is similarly provided on the inner wall at the boundary with the heater region 1. 6b is provided.

Although not shown in FIG. 1, the transport path 13 shown in FIG. 2 is provided in the vacuum brazing apparatus along the longitudinal direction, and the carrier frame 8 is hung on this transport path 13. It can be moved inside the device. In-carrier reflectors 9a and 9b are provided at the front and rear ends of the carrier frame 8, and the brazed objects 7 are loaded in the carrier frame 8. In addition,
Although not shown in the drawing, an opening to which a vacuum pump is connected is formed on the bottom surface or side portion of the heating chamber A so that the gas in the chamber is exhausted. Further, the cooling medium circulation pipes 10a, 10b are arranged so as to be airtightly inserted into the inner walls of the trap regions 2a, 2b.

The vacuum brazing apparatus according to the first embodiment of the present invention is constructed as described above. Next, its function and effect will be described.

When the preheating work of the brazed objects 7 is completed in the preheating chamber B, the sluice valve 4 b is opened and the carrier frame 8 having the brazed objects 7 loaded along the transport path 13 moves to the heater region 1. Be transferred. As a result, the object 7 to be brazed is transferred to the heater region 1, so that the sluice valves 4a and 4b are closed and the heating chamber A is made airtight. Next, when the heating chamber A is depressurized to a predetermined depressurization value by driving a vacuum device (not shown), the heaters 3a, 3a ', 3b, 3b', 3
c, 3c 'are energized to heat the heater region 1 . At this time, the cooling water is circulated through the Mg trap mechanisms 5a and 5b having the cooling surfaces in the trap regions 2a and 2b through the cooling medium circulation pipes 10a and 10b, that is, supplied and drained. As a result, the cooling surfaces of the Mg trap mechanisms 5a and 5b have a desired temperature of 400 ° C. or lower.

In the heating heater area 1 , the heaters 3 a, 3
Since a ', 3b, 3b', 3c, and 3c 'allow the temperature to be adjusted separately by the control device, the heater temperatures of the central heaters 3b and 3b' and the heaters 3a at both ends,
By adjusting the heater temperature of 3a ', 3c, 3c', all the brazed objects 7 are heated uniformly. Further, since the in-carrier reflectors 9a and 9b are provided at both ends of the carrier frame 8, the brazed objects 7 arranged at the ends of the carrier frame 8 are also reflected so that the heat is evenly distributed. To improve heat retention and eliminate uneven temperature,
All brazed objects 7 can be worked in a state suitable for brazing. On the other hand, although Mg trap mechanisms 5a and 5b are provided adjacent to the heaters 3a, 3a ', 3c and 3c' at both ends of the heating chamber A, if the end reflectors 6a and 6b are not provided, the Mg traps are not provided. Mechanism 5a, 5
Heat is also radiated to b and the cooling surface is heated, so that the Mg trapping efficiency deteriorates. However, according to the invention, the annular end
Since the partial reflectors 6a, 6b and the in-carrier reflectors 9a, 9b are provided, the Mg trap mechanisms 5a, 5
Almost no heat is radiated to b, and the influence of heat from the heater region 1 is reduced. In other words, the flow rate of the circulating cooling water does not have to be increased so much.

Generally, when the object to be brazed 7 is heated in a desired state of about 600 ° C. in vacuum, brazing is performed,
In brazing of aluminum, Mg for promoting brazing is vaporized just before the brazing material melts. Although the evaporated Mg flies around in the heating chamber A, the Mg trap mechanism 5
Since cooling water is supplied to and drained from the cooling medium circulation pipes 10a and 10b to a and 5b, the surfaces thereof have a desired temperature of 400 ° C. or less (for example, 3 ° C.) so that Mg can be captured.
Since it is cooled to 80 ° C. and is provided in the vicinity of the heater region 1 in which Mg is generated, Mg is dramatically and efficiently captured.

As described above, the heater region 1 and the Mg
Even if the trap mechanisms 5a and 5b are adjacent to each other, the temperature unevenness does not occur in the heater region 1, and the braze object 7 is brazed in a state suitable for brazing. When the work in the heating chamber A is completed, the sluice valve 4a on the unloading chamber c side is opened, the carrier frame 8 loaded with the sluice valve 4a is transferred to the unloading chamber c by the transfer means, and the brazed object 7 is removed from the unloading chamber c After being replaced with air, it is transported to the outside.

According to the present embodiment, since only the Mg trap mechanisms 5a and 5b are kept at 400 ° C. or lower in the heating chamber A, Mg does not adhere to each constituent in the heating chamber A and the Mg is removed. Since the work may be performed only on the Mg trap mechanisms 5a and 5b, the removal work can be greatly shortened.
In addition, it is possible to eliminate the discharge accident and the seal failure accident described above in the related art.

3 to 5 show a second embodiment of the present invention, the same parts as those in the first embodiment are designated by the same reference numerals,
Also, detailed description thereof is omitted.

As shown in FIG. 3, the Mg trap mechanism 1 is provided on the side walls of the trap regions 2 a and 2 b of the vacuum brazing apparatus.
9 and 20 are provided. Mg trap mechanism 19, 2
Since 0 has the same configuration, the Mg trap mechanism 20 on the side of the preheating chamber B will be described. As shown in FIG. 4, in the Mg trap mechanism 20, the cooling flat plate 60 of this embodiment is composed of a plurality of flat plate panels 61. A meandering cooling medium circulating pipe 21 is attached to the back surface of the cooling medium circulating pipe 21 from the cooling water supplying portion 21a in the cooling medium circulating pipe 21 along the arrangement route 22 of the cooling medium circulating pipe 21. It flows to the discharge part 21b and cools the cooling flat plate 60. Thereby, the cooling flat plate 60 can be set to a desired temperature of 400 ° C. or lower. As shown in FIG. 5, the cooling medium circulation pipe 21
Is arranged in the cooling water supply portion 21a so as to be bent backward of the surface of the flat panel 61, passes through the inside of the port 26 for supplying the cooling water from the outside of the furnace chamber, and penetrates into the seal port 27. It is detachable at the connection part 30. In the seal port 27, the O-ring 28 and the seal mechanism 29 are brought into close contact with each other to be airtight by tightening the cap 33 having the thread groove, and the joint between the port 26 and the seal port 27 is tightened with the bolt 32 of the flange portion 31a. As a result, since the seal member 31 is used for sealing, the inside of the heating chamber A is hermetically sealed from the atmosphere. On the other hand, although not described, the cooling water discharge part 21b has the same configuration as the supply part 21a . The upper end portion 61a and the lower end portion 61b of each flat panel 61 are L-shaped, and the upper end portion 61a is adapted to be hung on the hook 23 attached to the inner side wall 25 of the trap area 2b, and the lower end thereof. Part 61b
The gasket 24 is detachably attachable to the upper end portion 61a of the lower flat panel 61.

The second embodiment of the present invention is configured as described above, but in the present embodiment, the upper end portion 61a of each flat panel 61 of the Mg trap mechanism 20 is hung on the hook 23 and the lower end portion 61b thereof. Since the gasket 24 is only detachably sandwiched, the cooling medium circulation pipe 21 is removed at the water connection portion 30, and the bolt 32 and the cap 33 are removed, so that the seal port 27 becomes the cooling medium circulation pipe 21.
It is possible to pull out from the cooling flat plates 60 a cooling medium循
It can be taken out easily in the furnace together with the ring pipe 21 , and particularly when the indoor Mg removal work involves ignitability, the removal work can be performed outdoors, which is a great improvement in safety. In addition, since the gasket 24 is present, Mg
It is also possible to prevent Mg from flowing around to the back surface of the trap mechanism 20. Of course, the same effect as in the first embodiment can be obtained with respect to the capture of Mg.

FIG. 6 shows a third embodiment of the present invention. In this embodiment, a flat panel is hung on the side wall of the trap region as in the second embodiment, but only the parts different from the second embodiment will be described.

As shown in FIG. 6, a hook 38 for hanging a flat panel 39 and a cooling medium circulation pipe 36 are provided on the side wall 35 of the trap area 2b, and the cooling medium circulation pipe 36 has its surface. Is partially embedded in the side wall 35 so as to uniformly project into the trap region 2b.
The flat panel 39 is provided with a notch 34 so as to come into contact with the entire protruding surface of the cooling medium circulation pipe 36 when it is hung on the hook 38, and its upper end 39a is processed into an L shape. Since it is present, it can be easily hung on the hook 38, and its lower end portion 39a is attached by sandwiching a removable gasket 37. The cooling medium circulation pipe 36 is provided on the side wall 35 as in the second embodiment.
It is assumed that cooling water is circulated, that is, supplied and drained from the outside through the side wall 35. The side wall 35 is made of brick or the like so that the cooling medium circulation pipe 36 can effectively cool the flat panel 39 to a desired temperature of 400 ° C. or less. Insulation is used.

The third embodiment of the present invention is constructed as described above, but since the contact portion between the cooling medium circulating pipe 36 and the flat panel 39 is large in this embodiment, the cooling efficiency of the flat panel 39 is also improved. Well, since the cooling medium circulation pipe 36 is not attached to the flat panel 39, and the flat panel 39 is hung on the hook 38, the gasket 37 is used.
Can be easily removed from the side wall 35 by removing
Since the work of removing g is performed only by the flat panel 39, the work time is greatly shortened. The trapping efficiency of Mg has the same effect as that of the first embodiment.

Although the respective embodiments of the present invention have been described above, needless to say, the present invention is not limited to these and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the Mg trap mechanism was provided at two locations on both ends of the heating chamber, but it is limited to two locations.
You don't have to. Further, it may be applied to a batch type brazing furnace, and the end reflectors 6a and 6b may have a discontinuous annular shape, or each of the end reflectors and the in-carrier reflectors may be provided. 1
One may be omitted. Further, the cooling medium may not be water, and the Mg trap may be a jacket-type water-cooled magnet trap.

[0026]

According to the vacuum brazing apparatus of the present invention, since the Mg trap mechanism is provided adjacent to the heater region and the heat reflector means is interposed, the evaporated M
It is possible to capture g remarkably and efficiently by limiting g, and it is possible to eliminate the trouble caused by Mg adhering to the inner wall surface and components in the vacuum chamber. Further, since the number of maintenance and inspections can be reduced, it is possible to further improve the operation rate of the apparatus and to significantly reduce the running cost.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a main part of a vacuum brazing apparatus in a continuous furnace according to a first embodiment of the present invention.

FIG. 2 is a detailed sectional view taken along line [2]-[2] in FIG.

FIG. 3 is a schematic vertical sectional view of a main part of a vacuum brazing device in a continuous furnace according to a second embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of the vicinity of a trap region located on the preheating chamber side of the vacuum brazing device in FIG.

5 is an enlarged cross-sectional view taken along the line [5]-[5] in FIG.

FIG. 6 is a partial side view of a main part of a trap region in a vacuum brazing apparatus according to a third embodiment of the present invention.

FIG. 7 is a schematic vertical sectional view of a conventional vacuum brazing apparatus.

FIG. 8 is a schematic vertical sectional view of a vacuum brazing apparatus according to another conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 heating heater area 2a trap area 2b trap area 3a heater 3a ' heater 3b heater 3b' heater 3c heater 3c ' heater 5a Mg trap mechanism 5b Mg trap mechanism 6a end reflector 6b end reflector 9a carrier inside reflector 9b carrier inside reflector 10a Cooling medium circulation pipe 10b Cooling medium circulation pipe 19 Mg trap mechanism 20 Mg trap mechanism 21 Cooling medium circulation pipe 23 Hook 36 Cooling medium circulation pipe 38 Hook

Front page continued (72) Inventor Yoshishi Mizugaki, 1-1, Showa-cho, Kariya city, Aichi Prefecture, Nihon Denso Co., Ltd. (72) Inventor Takeo Kato, 2500 Hagien, Chigasaki-shi, Kanagawa Nihon Vacuum Technology Co., Ltd. (72 ) Inventor Atsushi Nakatsuka 2500 Hagizono, Chigasaki, Kanagawa Japan Vacuum Technology Co., Ltd. (72) Inventor Yasuo Yasawa 2500, Hagien, Chigasaki City, Kanagawa Japan Vacuum Technology Co., Ltd. (56) Reference JP 61-199071 ( JP, A) JP 55-33881 (JP, A) Actually opened 62-118671 (JP, U) Actually opened 63-127766 (JP, U)

Claims (4)

[Claims] 1. A vacuum exhaustion of a brazed object to which a brazing material is attached.
The device with vacuum brazing which is adapted to brazing the該被brazing material by heating in a gas the heating chamber, the heating
Heat provided in the room so as not to hinder the movement of the brazed objects
The heating chamber as a heater region by the reflector means of
If it is divided into at least the trap areas at both ends,
The cooling of the 400 ° C. or less at a cooling medium to the trap area
An apparatus for vacuum brazing, characterized in that a Mg trap mechanism having a cooling surface is provided. 2. The heat reflector means comprises means for heating the
Among the heating chamber between the heater region and before Symbol trap region
The vacuum brazing apparatus according to claim 1 , comprising an annular end reflector provided on a wall and an in- carrier reflector provided at an end of a carrier frame for carrying the object to be brazed. 3. A Mg trap mechanism having the cooling surface
Cooling flat plate and cooling medium provided close to the flat plate
A pipe for circulation according to claim 1 or 2.
Vacuum brazing device . 4. The cooling flat plate is composed of a plurality of flat plate members.
Detachable from the hooks on the inner wall of the heating chamber
The vacuum brazing apparatus according to claim 3 , wherein