JPH084209Y2 - Ceramic palette for brazing furnace - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing furnace ceramic pellet used when a metal fitting assembled for brazing is put into a brazing furnace.

[0002]

2. Description of the Related Art Generally, a metal fitting having a complicated shape, for example, a metal fitting for an automobile fuel hose is manufactured by assembling a plurality of parts and joining them by brazing. An example of such a metal fitting is shown in FIG. This metal fitting 1
Is composed of a ring-shaped head 2 and a pipe 3, and one end of the pipe 3 is fitted into a hole 4 provided in the ring-shaped head 2 to be assembled. A gap (indicated by a shaded area P in the figure) which is a portion to be brazed with the portion 4 is brazed with a braze (alloy mainly composed of copper or the like that melts at high temperature). When assembling and brazing the metal fitting 1, the metal fitting 1 is usually placed on a stainless steel plate-shaped pallet, and the pallet is passed through a brazing furnace by a belt conveyor to braze the metal fitting 1. Done.

[0003]

However, the above-mentioned pallet is rapidly heated to a high temperature of 1200 ° C. as shown by a curve X in FIG. 8 during a short period of about 60 minutes of passing through the brazing furnace. , It is cooled rapidly to near room temperature in a short time. Therefore, if the pallet is made of a stainless material, it has a drawback in that it cannot be used for a long period of time because it partially expands from the state of thermal expansion and does not return to its original shape and is warped or deformed. . Further, if the pallet is warped or deformed as described above, the metal fitting 1 cannot be placed in a positioned state. Therefore, for example, the pipe 3 of the brazed metal fitting 1
When bending, etc., the brazed metal fittings 1 cannot be automatically taken out, and an operator takes out the brazed metal fittings 1 one by one from the pallet and carries the pipes 3 to a bending device for bending. It has a problem that it has to be done manually. Further, when the assembled metal fitting 1 is placed on the pallet and passed through the brazing furnace, there may be an inconvenient situation in which the braze flows to a portion other than the brazing portion of the assembled metal fitting 1.

The present invention has been made in view of the above circumstances, and does not warp or deform even when a high temperature of 1200 ° C. is rapidly changed to room temperature, and the metal fitting is always placed with the metal fitting positioned. It is an object of the present invention to provide a ceramic pellet for a brazing furnace that can be used.

[0005]

In order to achieve the above object, a ceramics pellet for a brazing furnace according to the present invention comprises a plate-shaped pallet body made of porous ceramics, and a pallet body is formed on the surface of the pallet body. , Multiple positioning parts made of porous ceramics are placed in parallel to place and position the metal fittings assembled for brazing, and the mounting surface of each positioning portion receives the brazing planned part of the above metal fittings. It is formed on the inclined surface of the mounting surface which is downwardly inclined, and a hollow is formed in a portion of the pellet main body other than the portion where the positioning portion is formed.

[0006]

In other words, the present inventors constructed a pallet body made of porous ceramics, and when a plurality of positioning portions arranged in parallel on the surface of the pallet body were made of porous ceramics, the temperature reached 1200 ° C. It has been found that even under the temperature, the thermal expansion is small, and even if it is rapidly cooled from its high temperature to near room temperature in a short time, it does not warp or deform. Based on this, the present inventors arranged a plurality of porous ceramic positioning parts for placing and positioning the metal fittings assembled for brazing on the surface of the above-mentioned porous ceramics pallet body. . This allows
The metal fittings assembled for brazing can be positioned and placed on the surface of the pallet body at all times, and the metal fittings can be held even when the pallet passes through the brazing furnace. Therefore, according to the ceramic palette of the present invention, the brazed metal fittings can be individually taken out by a machine. Further, since the mounting surface of each of the positioning portions is formed as an inclined surface that is downwardly inclined toward the portion of the mounting surface that supports the portion to be brazed of the metal fitting, the brazing to the portion to be brazed is performed. The flow of wax will improve, and wax will not flow anywhere other than the part to be brazed. Further, when the hollowed holes are formed in the portion of the pallet body other than the portion where the positioning portion is formed, the heat capacity of the entire pallet is reduced, so that the blackening of the metal fitting, which occurs when the metal fitting is cooled slowly, does not occur. Further, since the pallet does not block the frame curtain at the inlet of the brazing furnace due to the hollowed holes, oxygen does not enter the reducing atmosphere in the brazing furnace. Further, in this invention, when the porous ceramic is porous cordierite,
Even if it is heated to a high temperature of 200 ° C., it will endure the high temperature and will not be deformed.

Next, the present invention will be described in detail based on embodiments.

1 and 2 show an embodiment of a ceramics pellet for a brazing furnace according to the present invention. The ceramic palette 6 contains 53% of SiO ₂ , 37% of Al ₂ O ₃ and 10% of MgO, and is made of porous cordierite having the characteristics shown in Table 1 below.

[0008]

[Table 1]

This pallet 6 is a plate-shaped pallet body 7
At both ends along the longitudinal direction of the surface of the metal plate 1, there are provided stoppers 9 formed by continuously forming curved surfaces 8 along the curved surface of the ring-shaped head 2 of the metal fitting 1 assembled for brazing. Further, when the metal fitting 1 is placed alternately on the surface of the pallet body 7 along the width direction with the ring-shaped head 2 along the curved surface 8 as shown in FIG. A positioning portion 11 for placing and positioning the pipe 3 portion of the metal fitting 1 is provided in parallel. The mounting surface of the positioning unit 11 is shown in FIG.
As shown in FIG. 3, the inclined head 12 is formed on the inclined surface 12 that is downwardly inclined toward the portion of the mounting surface that supports the ring-shaped head 2 and the portion to be brazed (see FIG. 7) of the pipe 3. Numeral 13 is an oval-shaped hollowed hole, which is used to reduce the heat capacity of the pallet 6 and eliminate the blackening of the metal fittings.
Is formed in the part. Reference numeral 14 is a hole for identifying the type of metal fitting when the pallet 6 is automatically conveyed.

When the metal fitting 1 assembled for brazing is placed on the ceramic pallet 6 constructed as described above and is passed through the brazing furnace, as shown in FIGS. 2 and 3, The ring-shaped heads 2 are placed so as to be in contact with the curved surfaces of the left and right hit stop portions 9, respectively, and the end portion of the pipe 3 is placed on the inclined surface 12 of the positioning portion 11. Then, the pallet 6 in this state is placed on the belt conveyor and passed through the brazing furnace to braze the metal fitting 1. In the pallet 6, as shown in FIG.
A long metal fitting can be placed and brazed.

As described above, when the brazing furnace pallet is made of porous ceramics, it does not warp or deform due to thermal expansion even when repeatedly passed through the brazing furnace.
It can be used for a long period of time. Further, the metal fittings 1 assembled for brazing can be mounted on the pallet 6 in an aligned state, and the mounted state can be maintained even when passing through the brazing furnace, so that the brazing is possible. The metal fittings 1 can be individually conveyed by a machine. Further, since the surface on which the pipe 3 portion of the positioning portion 11 is mounted is the inclined surface 12, it is possible to prevent the brazing metal from flowing to the portion to be brazed of the metal fitting 1 and to the portion other than the portion to be brazing. it can. Further, since the heat capacity of the entire pallet 6 is reduced by the hollow hole 13, the metal fitting 1 is cooled more quickly and the metal fitting 1 is not blackened. Further, the hollow hole 13 prevents the pallet 6 from blocking the frame curtain at the inlet of the brazing furnace and prevents oxygen from entering the brazing furnace in a reducing atmosphere, so that the metal fitting 1 is oxidized. Absent.

FIG. 5 shows another ceramic pellet for a brazing furnace according to the present invention. This ceramic pallet 6a is used when brazing the metal fitting 1a as shown in FIG. 6, and is made of porous cordierite as in the above embodiment. The pallet 6a is provided with wall portions 18 at both ends and the central portion along the longitudinal direction of the plate-shaped pallet body 7a. Reference numeral 15 denotes a concave portion, which is formed on the upper end surfaces of the rear wall portion 18 and the central wall portion 18 so that the tip portion of the pipe 3a of the metal fitting 1a assembled for brazing can be placed as shown in FIG. It has become. Further, on the upper surface of the pallet body 7a, there is provided a positioning portion 11a for the metal fitting 1a which is also made of porous cordierite. The positioning portion 11a is detachably attached to the pallet body 7a by engaging an engaging projection 16 formed on the lower surface thereof with a small hole 17 formed in the plate surface of the pallet body 7a. In addition, the positioning unit 1
In the surface of the metal 1a on which the metal fitting 1a is mounted, the portion of the mounting surface that supports the metal fitting 1a is formed on the inclined surface 12a. And
Similar to the above-described embodiment, the hole 13a is formed in the portion of the pallet body 7a other than the positioning portion 11a.
Are formed. The pallet 6a thus configured has the same effects as those of the above-described embodiment, and various metal fittings can be placed by changing the positioning portion 11a to a positioning portion having a different shape. become.

The porous ceramics constituting the pallets 6 and 6a are not particularly limited,
Cordierite is particularly suitable.

[0014]

As described above, the ceramic pellet for brazing furnace according to the present invention is a porous ceramic body having a plate-shaped pallet body and a plurality of positioning portions arranged in parallel on the surface of the pallet body, which have a small thermal expansion. Therefore, even if the pallet is repeatedly passed through the brazing furnace, it does not warp or deform. Therefore, it can be used for a long period of time, and the manufacturing cost can be reduced. Further, a plurality of positioning parts made of porous ceramics are provided in parallel on the surface of the pallet body for mounting and positioning the metal fittings assembled for brazing. Therefore, the metal fittings assembled for brazing can be positioned and placed on the surface of the pallet body, and since the metal fittings can be held even when the pallet passes through the brazing furnace, The brazed metal fittings can be individually taken out by a machine, and the production line can be automated. Further, since the bottom surface of each of the positioning portions is formed as an inclined surface that is downwardly inclined toward the bottom surface portion that supports the brazing planned portion of the metal fitting, the brazing flow to the brazing planned portion is improved. be able to. In addition, if a hollow hole is formed in a portion of the pallet body other than the portion where the positioning portion is formed, the heat capacity of the entire pallet is reduced and the metal fitting is cooled faster. You can Furthermore, due to the above-mentioned hollow hole,
Since the frame curtain at the furnace inlet is not cut off, oxygen does not enter the reducing atmosphere in the brazing furnace, and the metal fitting can be prevented from being oxidized and blackened. Further, in the present invention, when the porous ceramics is porous cordierite, 1200
Even if it is heated to a high temperature of up to ℃, it will endure the high temperature and will not be deformed.

[0015]

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a plan view showing a mode of use of the above embodiment.

FIG. 3 is a longitudinal sectional view showing a use mode of the embodiment.

FIG. 4 is a vertical cross-sectional view showing a mode of use of the above embodiment.

FIG. 5 is a plan view showing another embodiment of the present invention.

FIG. 6 is an explanatory view of a main part showing a mode of use of the above embodiment.

FIG. 7 is a front view of a metal fitting.

FIG. 8 is a curve diagram showing changes in temperature in the brazing furnace.

[Explanation of symbols]

 1,1a Metal fittings 7,7a Pallet body 11,11a Positioning part 12,12a Sloping surface 13,13a Hollow hole

Claims (2)

[Scope of utility model registration request] 1. A plate-shaped pallet body is made of porous ceramics, and a metal fitting assembled for brazing is placed and positioned on the surface of the pallet body.
Positioning parts made of porous ceramics are arranged side by side,
The mounting surface of each positioning portion is formed as an inclined surface that is downwardly inclined toward the portion of the mounting surface that supports the portion to be brazed of the metal fitting, and the pallet body other than the portion where the positioning portion is formed. A ceramic pallet for a brazing furnace characterized in that a hollowed hole is formed in the part. 2. The porous ceramic is a porous cordierite.
A brazing furnace ceramic spa according to claim 1, which is a light.
Lett.