JPH025515B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a joining structure for members using brazing material.

[Prior Art] Conventionally, a member made of metal or ceramic and a member made of metal or ceramic are provided with a mounting hole in one member and an insertion portion in the other member, and the mounting hole and the insertion portion are fitted. If it is necessary to join with
The joint was made using brazing material or the like.

However, the joining methods of shrink fit, cold fit, and press fit are not sufficiently effective unless the dimensions of the insertion portion and the mounting hole are precisely machined. Further, when joining members made of ceramic, methods such as shrink fitting, cold fitting, and press fitting cannot be used because ceramic has a low coefficient of thermal expansion and does not have very high toughness.

On the other hand, in the joining method using brazing, which fills brazing material between the outer surface of the insertion part and the inner surface of the mounting hole,
The dimensions of the insert and mounting holes do not need to be very precise. Furthermore, it is possible to join ceramics together if the outer surface of the insertion part and the inner surface of the mounting hole are coated with metal, so-called metallization treatment, or if a brazing material with good wettability to ceramics is used.

The joining method by brazing involves fitting the insertion part into the mounting hole and then injecting brazing material through the opening of the mounting hole.

A method in which brazing material is applied to the outer surface of the insertion part and then fitted into the mounting hole.

A method of placing brazing material inside the mounting hole, softening the brazing material by heating, and then pushing the insertion part.

However, since the brazing material is injected from the opening of the mounting hole after insertion, the shapes of the mounting hole and the insertion portion are limited. In addition, it is difficult to fill it uniformly. It is difficult to adjust the amount of brazing material applied to the outer surface of the insertion part, and the operation is complicated. According to , joining can be done with a relatively simple operation, and if the thermal expansion of the component with the mounting hole is relatively large, the mounting hole will contract after cooling, and the insertion part will be tightened through the brazing material, making it stronger. It is possible to perform various types of joints.

[Problems to be solved by the invention] However, there are reasons such as the wettability of the brazing material and the component and the difficulty of keeping the gap between the outer surface of the insertion part and the inner surface of the mounting hole constant over the entire circumference when pushing. Therefore, it has never been easy to uniformly fill all the gaps between the outer surface of the insertion portion and the inner surface of the attachment hole with brazing material.

Even if the brazing material is made easier to fluidize, and even if the outer surface of the insertion portion and the inner surface of the mounting hole are surface-treated, it is still difficult to uniformly fill the brazing material.

As a result, some parts of the brazing material were incomplete or not brazed at all, making it impossible to stably manufacture products of good quality.

[Means for Solving the Problems] The present invention employs the following technical means as a configuration of the invention in order to solve the above problems.

That is, the joining structure of the members of the present invention is such that the member A has a mounting hole made of ceramic or metal.
, a member B made of ceramic or metal and having an insertion portion corresponding to the mounting hole; and a member B which is placed inside the mounting hole of the member A and is pressed by the insertion portion of the member B in a molten state to form an outer surface of the insertion portion. and a brazing material that fills and joins the space between the inner surface of the mounting hole and the inner surface of the mounting hole, and a flow resistance part that provides flow resistance to the brazing material that is pressed by the insertion part of the member B and flows, It is characterized in that it is provided on the inner surface of the mounting hole of the member A near the opening of the mounting hole and/or on the outer surface of the insertion portion of the member B facing the inner surface of the mounting hole.

The brazing material used in the present invention is one normally used for brazing, for example, JIS A-
Al low like 4047 and Ag like JIS BAg-8
It is low.

Members A and B may each be made of metal or ceramic, and when members A and B are combined, they may be made of metal or ceramic, or one of the members may be metal and the other ceramic.

[Operation] When the insertion part is pushed into the mounting hole in which the heated, melted and softened brazing material is placed, the flowing brazing material moves up the gap between the inner surface of the mounting hole and the outer surface of the insertion part. Even if it begins to rise unevenly depending on the location, the inner surface of the mounting hole near the opening of the mounting hole and/or
Or, at a flow resistance part provided on the outer surface of the insertion part facing the inner surface of the mounting hole near the opening of the mounting hole,
The brazing material in the part that rose quickly is subjected to flow resistance,
The flow will turn to the side where the flow resistance is low and the brazing material will not rise sufficiently. Therefore, before the rapidly rising portion leaks out from the opening of the attachment hole, all the portions with less flow resistance below the flow resistance portion are uniformly filled with brazing material.

[Example] An embodiment of the present invention will be described.

FIG. 1A is an end view of this embodiment, and the scale is partially different for the sake of explanation.

In this example, member A1 has an outer diameter of 10 mmφ and a length of
This is a 50mm bar with a mounting hole 3 with a diameter of 8mmφ and a depth of 30mm, and the material is stainless steel (SUS304).
Made in Japan. Member B5 is a bar with an outer diameter of 7.98 mm and a length of 50 mm, with an outer diameter of 7.95 mm at 20 mm from one end, and the side with the smaller diameter becomes the insertion portion 7. The material is ceramic (alumina sintered body). Raw material 9
As the material, Al low (JIS A-4047) was used.

In this embodiment, the step portion on the outer surface of member B becomes the flow resistance portion 11.

In this example, first, a brazing material is placed on the bottom of the member A1.
Place 0.2g and insert member B5 from above. Next, a weight of about 50 g was placed on the top of member B5, and a total of 5 similar samples were made, and heated at 620° C. in a vacuum (10 ^-4 Torr) furnace.
After heating at ℃ for 10 minutes, it was cooled.

The filling state of the brazing filler metal 9 is shown in FIG. This figure represents a front view of member B5 with D-material attached, after member A1 has been removed by cutting.

Also, as a comparative example, member B5 has an outer diameter of 7.95mmφ and a length of
Five pieces were made that were the same as in this example except that the material was replaced with a 50 mm member B13. Figures 2A and 2B show typical filling conditions of brazing filler metal in a comparative example. FIG. 2A is an end view thereof, and FIG. 2B is a front view of member B13 from which member A1 has been removed by cutting in order to see in detail the filling state of brazing material 15.

In the example, all five bodies were uniformly filled with brazing material 9 as shown in FIG. 1A and 1B. However, in the comparative example, only one case was filled to the same extent as in the example, and the other four cases were filled as shown in FIG. 2 (a) and (b).

In the comparative example, the reliability of the joint becomes very low because the filling is not uniform. On the other hand, in the examples, all the samples were uniformly filled with brazing material, and the reliability of the bonding was very high. Further, member B5 of this example was made of non-metalized ceramic, but had sufficient strength. Furthermore, it is preferable to use a ceramic material with a metalized surface as the member B, since it provides not only mechanical bonding but also chemical bonding, thereby improving bonding strength.

In this example, the flow resistance part was a step due to the difference in the outer diameter of the member B5, but the insertion part was shaped to become narrower toward the tip as shown in Figure 3, and the flow resistance part was formed in the mounting hole as shown in Figure 4. metal ring 4
0 is press-fitted, as shown in Fig. 5, the inner diameter of the upper part of the inner surface of the mounting hole becomes smaller toward the opening, as shown in Fig. 6, the inner diameter of the upper part of the inner surface of the mounting hole is smaller than that of the lower part. Flow resistance can be generated by using a material such as one with unevenness on the upper inner surface of the mounting hole as shown in the figure, or one with unevenness on the part of the insertion part facing the upper inner surface of the mounting hole as shown in Fig. 8. Good too.

In addition, in FIGS. 3 to 8, 311 to 316 are members A, 321 to 326 are members B, and 331 to 33
6 is a flow resistance part, and 341 to 346 are brazing materials. Further, for the sake of explanation, all of the embodiments are described with respect to the joining of rod-shaped members, but it is clear that members of other shapes, such as plate-like members, can be joined in the same manner if mounting holes and insertion portions are provided.

[Effects of the Invention] The member joining structure of the present invention provides a flow resistance portion at the joint consisting of the mounting hole of the member and the insertion portion of the member, so that the brazing material can be inserted between the inner surface of the mounting hole and the outer surface of the insertion portion. This is to uniformly fill the entire area.

By using the present invention, the entire joint can be filled with the brazing material very easily and uniformly, the reliability of the joint of members can be increased, and the quality can be stabilized.

[Brief explanation of drawings]

FIG. 1A is an end view of an embodiment of the present invention, FIG. 3 to 8 are end views showing other embodiments. 1,311-316... Member A, 3... Mounting hole, 5, 13, 321-326... Member B, 7...
...insertion part, 9,15,341-346...brazing material, 11,331-336...flow resistance part.

Claims (1)

[Scope of Claims] 1. A member A having a mounting hole made of ceramic or metal; a member B having an insertion portion corresponding to the mounting hole made of ceramic or metal; a brazing material that is pressed by the insertion portion of the member B in a state to fill and join between the outer surface of the insertion portion and the inner surface of the attachment hole; A flow resistance portion that provides flow resistance to the flowing brazing material is placed on the inner surface of the mounting hole in the vicinity of the opening of the mounting hole of the member A and/or on the outer surface of the insertion portion of the member B facing the inner surface of the mounting hole. A joining structure of members characterized by providing: