JPS63255021A - Production of metal vacuum double container - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a metal container body in which a space is provided between an outer cylinder and an inner container, and an opening through which the space communicates with the outside of the container body. A metal vacuum double container, in which the container body and a metal lid, which is applied via a brazing material to close the opening, are hermetically joined by a brazing material after the space is evacuated in a vacuum heating furnace. This invention relates to an improvement in the manufacturing method of.

(Prior art) Conventionally, as shown in FIG.
(see Publication No. 6), a plurality of solid brazing materials 7 are arranged between the container body A and the lid 6, and a large gap is formed between the container body A and the lid 6 by the interposition of the brazing materials 7. C, the space 4 is evacuated, and as the brazing material 7 is melted, the lid body 6 is
is lowered by its own weight so that the molten brazing material 7 is immersed around the entire circumference of the opening 3.

(Problem to be solved by the invention) However, in the conventional case, the brazing material 7 is
Since the lid body 6 must be placed around the lid body 6, the preparation work is complicated and has to be done manually, leading to an increase in costs. Furthermore, the placement of the brazing material 7 may vary, and the brazing material 7 may be partially insufficient or excessively protruding, making it difficult to ensure a predetermined quality and resulting in poor yield.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a vacuum double container made of metal that does not have the above-mentioned problems by improving the handling of brazing material.

(Means for Solving the Problems) In order to achieve the above-mentioned objects, the present invention provides a space 4 in a metal container body A in which a space 4 is provided between an outer cylinder 1 and an inner container 2.
An opening 3 is formed through which the opening 3 communicates with the outside of the container body A, and the metal lid 6 is placed in a vacuum heating furnace 5 to close the opening 3 with a brazing material 7 interposed therebetween. , after the space 4 is evacuated, the brazing material 7 is used to airtightly connect the space 4 with the brazing material 7, in which the paste-like brazing material 7 is applied to at least one of the joining surfaces of the lid body 6 and the container body A with a screen or It is characterized in that it is printed by a transfer method or the like, and after the evacuation, it is once heated and melted, and then cooled and solidified to perform the airtight bonding.

(Function) Paste brazing material 7 is attached to at least one of the joint surfaces between the metal container body A and the metal lid 6 that closes the opening 3 by printing using a screen or transfer method, etc. The required predetermined amount can be accurately deposited on the main body A and the lid 6 at the positions and ranges necessary for their airtight connection. Moreover, since the brazing material 7 is in a paste form, its unadhered state does not change even when the container body A or the lid 6 is handled, and there is no problem in handling it mechanically, so automation is possible.

The printed brazing material 7 forms a bulge on the printed surfaces of the container body A and the lid 6, and the joint surfaces of the container body A and the lid 6 are separated, so that the space 4 through the opening 3 in the vacuum heating furnace 5 is It becomes possible to exhaust the air.

After the space 4 is evacuated, the printed brazing material 7 between the container body A and the lid 6 is heated and melted in the vacuum heating furnace 5, and the insertion due to the weight of the lid 6 is done by force. The space 4 of the container body A and the container body A are continuously filled in an annular shape between the joint surfaces of the container body A and the lid body 6 while expanding somewhat around the circumference.
The communication with the outside through the opening 3 is completely blocked.

In this state, the brazing material 7 is solidified by cooling, and the container main body A and the lid 6 are joined while maintaining the above-mentioned shut-off state, and thereafter the space 4 can be kept in a vacuum state due to the above-mentioned exhaust.

(Example) As shown in Fig. 2, the peripheral wall 1a of the outer cylinder 1 and the inner container 2 are hermetically welded at the mouth W1, and the peripheral wall 1a of the outer cylinder 1 and the bottom wall 1b with the opening 3 are connected at the bottom W2. A metal container body A having a space 4 formed between an outer cylinder 1 and an inner container 2 by airtight welding is manufactured.

Note that the outer surface of the inner container 2 is previously subjected to surface treatment such as copper plating.

Next, a paste brazing material 7 is applied to at least one of the joint surfaces a and 68 between the container body A and the metal lid 6 that closes the opening 3, in this embodiment, the joint surface 6a of the lid 6. An annular putter with divided parts at multiple locations is attached as shown in FIG. 3 by printing using a screen or transfer method. The paste brazing material 7 is accurately deposited in a predetermined amount at a predetermined position and range on the bonding surface 6a according to a printing pattern such as a screen or transfer, and rises up almost uniformly as shown in the figure.

After such pretreatment, as shown in FIG. 1, the container body A is placed in the vacuum heating furnace 5 in an inverted position, and the lid body 6 is placed so that the surface on which the brazing material 7 is printed faces downward. Place it on the opening 3 of the container body A. As a result, the joint surfaces a and 6a of the container body A and the lid 6 are opposed to each other with the brazing material 7 interposed therebetween. In this state, a gap is formed between the joint surfaces a and 68 due to the divided portion of the brazing material 7, forming a positive passage P for the space 4 to communicate with the outside of the container body A through the opening 3.

However, even without such an active path P, the surface of the screen-printed brazing material 7 will still have texture-like unevenness, and even if it is smoothed by other printing methods, it will not be possible to form an airtight contact. Therefore, the space 4 is not prevented from communicating with the outside of the container body A.

On the other hand, when the lid 6 is placed as described above, a gator material for removing gas (H2, Co, CO□, etc.) in the space 4 is placed on the inner surface of the lid 6 and the bottom wall 1b. , are placed in space 4.

Next, after sealing the vacuum heating furnace 5, while discharging the air inside it with the vacuum pump PU, the temperature inside the vacuum heating furnace 5 is raised by the heater H, and the gas in the space 4 is removed from the opening 3, the passage P, etc. Vent the air thoroughly through the

Thereafter, the temperature in the furnace is once raised by the heater H to melt the brazing material 7, and then the temperature in the furnace is lowered to cool and solidify the melted brazing material 7. As a result, the space 4 is sealed in a high vacuum state by hermetically sealing the container body A and the lid 6 together by brazing.

This sealing is performed by the brazing material 7 attached in a predetermined amount at a predetermined position and range of the joint surface, so there is no excess or deficiency of brazing material 7 or unevenness at each joint part.
Protrusion of the brazing material 7 and poor bonding do not occur even partially.

The printing pattern of the brazing material 7 can be selected as appropriate, and other examples will be described below.

In the second embodiment shown in FIGS. 4 and 5, the brazing material 7 is screen-printed uniformly over the entire circumference of the lid 6 and at an appropriate distance from the opening 3 and the outer periphery. This prevents the brazing material 7 from flowing down into the space 4 or flowing out around the outside of the lid 6 or the container body A when melted.

This embodiment is an example in which a positive passage P is not provided as in the previous embodiment, and since no dividing part is provided in the printed pattern on the brazing material 7, the soldering material 7 is joined around the entire circumference of the airtight joint part. The condition can be made more uniform.

The third embodiment shown in FIGS. 6 and 7 is similar to the second embodiment, in which the soldering material 7 is printed in a continuous annular shape, but built-up portions 7a are formed at several locations on the circumference. are doing. This built-up part 7a can be obtained by screen-printing the built-up part 7a again on the screen-printed annular brazing material 7, and the annular brazing material 7 is attached to one side of the container body A and the lid 6. The same condition can be obtained by printing and matching the built-up portion 7a on the other side.

Due to the presence of the built-up portion 7a, when the lid 6 is placed against the opening to the container body, a positive force similar to that in the first embodiment is formed between the joint surface a and 68 between the container body A and the lid 6. A passage P can be formed.

As a result, the features of the second embodiment can be followed, and the exhaust can be carried out even more smoothly.

In the fourth embodiment shown in FIGS. 8 and 9, the brazing material 7 is printed on the lid 6 in an annular shape with a dividing portion at one location on the circumference. A positive passage P is formed at the section, which is more advantageous for exhaust than the second embodiment, and the joining is more uniform in the circumferential direction since there are fewer divided sections than in the first embodiment. The state is obtained.

In the fifth embodiment shown in FIGS. 10 and 11, irregularities 7b in the circumferential direction are formed on the surface of the brazing material 7 printed in an annular shape on the lid 6, and the concave portions form positive passages P. will be formed. Therefore, similar effects to those of the third embodiment are exhibited.

The unevenness 7b may be formed by molding the surface of the printed brazing material 7, or the same method as in the third embodiment may be used.

In the sixth embodiment shown in FIGS. 12 and 13, the brazing material 7 is printed on the lid body 6 in an annular shape having a divided part as in the fourth embodiment, and one of the divided ends of the brazing material 7 is printed. A surrounding portion 7c is also formed extending from the top so as to surround the divided portion.

This surrounding portion 7c allows the brazing material 7 to connect at the divided portions when the surrounding portion 7c is melted without affecting the existence of the positive passage P, thereby making it difficult to cause bonding defects.

In addition, in any of the embodiments, since the brazing material is printed, it can be done automatically in the manufacturing process or processing process, regardless of whether the printing target is the lid 6 or the container body A.
Moreover, there is no need to stain the printing target with wax material during the process.

(Effects of the Invention) According to the present invention, a paste brazing material is printed on at least one of the joint surfaces of the lid and the container body,
After being evacuated in a vacuum heating furnace, it is heated and melted, and then cooled and solidified to achieve the above-mentioned airtight joining. Since the necessary predetermined amount can be deposited accurately in the position and range, there is no excess or shortage of brazing material or protrusion at each part of the joint, making it easier to obtain the desired quality and improving yield.

In addition, printing of the brazing material can be done automatically, and since the brazing material is in paste form, the state once attached will not change even if the container body A and the lid 6 are handled. Since there is no problem in handling the lid body 6 mechanically.
The work of assembling and vacuum sealing the container main body A can also be easily automated.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a vacuum heating furnace showing the working status of vacuum sealing a double vacuum container made of metal, Figure 2 is a sectional view of the main body of the metal container, and Figure 3 is a sectional view of the container body and the roller that closes its opening. 4, 5, 6, 7, 8, 9, 10, 11. Figures 12 and 13 are numbers 2 to 6, respectively.
FIG. 14 is a plan view showing how the brazing material is printed on the lid of each embodiment, a partial sectional view showing the combination with the container body, and FIG. 14 is a partial sectional view showing the conventional example.

Claims (1)

[Claims] (1) A metal container body (A) with a space (4) between the outer cylinder (1) and the inner container (2);
An opening (3) communicating with the outside is formed, and the metal container main body (A) and a metal lid body (6) are fitted through brazing material (7) so as to close the opening (3). , vacuum heating furnace (5
), the space (4) is evacuated and then the space (4) is airtightly joined with a brazing material (7), the paste-like brazing material (7) being applied to the lid (6) and the container body ( A) A method for manufacturing a double vacuum container made of metal, comprising printing on at least one of the surfaces to be joined with A), heating and melting the printed material after the evacuation, and then cooling and solidifying the printed material to form the airtight joint. .