JPS6320159A - Joining method for metallic member - Google Patents

Abstract

PURPOSE:To temporarily assemble a joining member without using a jig and welding, etc., and to prevent the shift of a joint position by piercing plural vertical holes in the opposed position of each joint surface of a metallic member to be joined by brazing, etc., and inserting and attaching a common pin to its vertical hole. CONSTITUTION:In case of the surface junction of a metallic member by brazing, a diffused junction, etc., for instance, in case of a liquid phase diffused junction of a stationary blade of a gas turbine, the side face of three pieces of buttress parts of a stationary blade single substance 1 is used as a joint surface 2 and on its joint surface 2, a vertical hole 3 is pierced. Subsequently, a pin is inserted into this vertical hole 3, and also, by interposing an insert material (50mum thick), a junction is executed. In such way, the joint position is fixed by the inserted pin, and the pin is left as it is in the member after the junction. Such a junction is applied to brazing for many joint parts, a liquid phase diffused junction, and a solid phase diffused junction, and a precise junction assembly can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to surface bonding (interfacial bonding) of metal members by brazing, liquid phase diffusion bonding, solid phase diffusion bonding, etc.

[Conventional technology]

For surface joining of metal materials and ceramics, brazing,
Liquid phase diffusion bonding and solid phase diffusion bonding are applied, but temporary attachment using jigs and welding is used to position and control the gap between the bonded pairs.

[Problem that the invention seeks to solve]

The above-mentioned joining generally has strict requirements for the dimensional accuracy of the joined assembly, and so-called precision joining is often required, but positioning using a joining jig is difficult to avoid due to thermal distortion of the jig or heat between the jig material and the joining member. Due to differences in expansion coefficients, distortions often occur during heating of the bond. 1. In the case of brazing or liquid phase diffusion bonding, it is necessary to maintain the gap between the bonding surfaces substantially constant within a required range, but this is often difficult with conventional methods.

[Means for solving problems]

In the present invention, when joining metal members face-to-face by brazing, diffusion bonding, etc., a plurality of vertical holes are bored at opposing positions on each joining surface of the metal members, and a common pin is inserted into the opposing vertical holes. This is a joining method for metal members characterized by fixing and joining the joining surfaces facing each other, and also, when joining metal members face-to-face by brazing, diffusion bonding, etc., each joining surface of the metal members is By drilling multiple vertical holes at the positions where the joints are to be connected and inserting a common pin with a washer through the opposing vertical holes, the washer is inserted between the joint surfaces to maintain a constant gap between the joint surfaces. This is a method for joining metal members, characterized in that the joining surfaces are fixed facing each other and joined.

The joining position can be fixed by making a hole on the joining surface of the joining member and inserting a pin into the hole.

If the pin remains in the member after joining, then K.

In addition, the gap can be kept constant by having the pin pass through a washer with a thickness corresponding to the required gap and interposing it between the joint surfaces.

The materials for the pins and washers mentioned above are preferably of the same type as the joining member.

[Effect]

As a result of the above, it is possible to prevent the joint position from shifting, to maintain a constant joint gap, and to temporarily assemble the joint members without using a jig or spotting by welding.

〔Example〕

As an embodiment of the present invention, liquid phase diffusion bonding of stator vanes of a gas turbine will be explained with reference to FIGS. 1.2 and 3.

As shown in FIG. 1, a stator blade segment as shown in FIG. 2 was manufactured using the side surface of the buttress (BUTTRIC88) of 103 single stator blades of a gas turbine as the joint surface 2. In this case, as shown in FIG.
The pin 4 shown in the figure was inserted, and an insert material (thickness: 50 μm) was interposed between the bonding surfaces to perform bonding.

The material of the stationary blade is N1-based heat-resistant alloy (N1-15%Or-
6% AI! -4%Mo -2%Wb -0.7%Ti)
However, the material of the pin is N1-based heat-resistant alloy (
Ni -22X Or -18,5%Fe -9X M
o -1,5X Co -0,6X W).

The diameter of the hole #i is 5.05m, and the diameter of the pin is S.
, OW. N1-15%0 as insert material
An amorphous metal foil of r-4% B was used.

The joint was fixed by inserting the pin as described above, and the temporary assembly with the insert material inserted between the joint surfaces was heated at 1200C in a vacuum.
, and bonded by heating for 7 hours.

As another embodiment of the present invention, an example of brazing a combustion chamber of a liquid rocket engine will be explained with reference to FIG. 5 and FIG. 6, which is an enlarged view of part A thereof.

A combustion chamber 5 as shown in FIG. 5 is assembled by stacking oxygen-free copper segments 6 having cooling grooves 7 as shown in FIG. 6 and brazing the segments 6 together.

In this case, as shown in FIG. 6, a hole is made in the joint surface, a pin 9 is inserted through a washer 8 to maintain a constant joint gap, and a foil 10 of brazing material is inserted between the joint surfaces. I did some brazing. The pins 9 were inserted at three locations on the circumference of each joint surface between the segments 6.

The material of pin 9 was 5U8504 stainless steel. The diameter of the hole was 5.111, and the diameter of the pin was 5.0.

The material of the washer is 8U8504 stainless steel, and the size is φ15.
．． OXφ5. IXtO, 05wm.

The brazing filler metal is Big-8 (nominal chemical composition 72%Ag-28
%au) foil (thickness o, o811II) was used. Brazing was carried out by heating the temporary assembly to which the pin, washer, and wax wave foil were applied as described above at 800°C for 15 minutes in a hydrogen atmosphere.

〔Effect of the invention〕

As described above, according to the present invention, precision bonding assembly using brazing, liquid phase diffusion bonding, or solid phase diffusion bonding with many bonding points becomes possible.

Furthermore, during brazing or liquid phase diffusion bonding, high quality and high strength bonding can be obtained by keeping the gap between the bonding surfaces constant.

4. Brief description of aspects FIG. 1 is a schematic diagram of a gas turbine stator vane unit as an embodiment of the present invention, and FIG. 2 is a schematic diagram of the stator vane unit of FIG. 1 bonded by diffusion bonding. FIG. 3 shows a hole drilled in the joint surface, and FIG. 4 shows a pin. FIG. 5 is a schematic view of a liquid rocket engine combustion chamber as another embodiment, and FIG. 6 is an enlarged view of FIG.

Among the sub-agents: 1) Akira Sub-agent Ryo Hagi Hara - Sub-agent Atsuo Annishi Guan ( Figure 3 Figure 5

Claims (2)

[Claims] (1) When joining metal members face-to-face by brazing, diffusion bonding, etc., a plurality of vertical holes are bored at opposing positions on each joint surface of the metal members, and a common pin is inserted into the opposing vertical holes. A method for joining metal members, characterized in that the joining surfaces are fixed facing each other and joined. (2) When joining metal members face-to-face by brazing, diffusion bonding, etc., a plurality of vertical holes are bored at opposing positions on each joint surface of the metal members, and a common pin is inserted with a washer through the opposing vertical holes. By inserting a washer between the joint surfaces, the gap between the joint surfaces is kept constant and the joint surfaces are fixed facing each other.
A method for joining metal members, characterized by joining.