JPH04121591U - Shape memory alloy joint with tilting function - Google Patents

Abstract

(57) [Summary] [Purpose] To realize a joint suitable for connecting dissimilar parts. [Structure] Both end portions 11 and 12 are formed of shape memory alloys having different compositions, and a diffusion bonded portion 10 having a gradient function is formed between them.
Members 13 and 14 made of different materials can be connected under construction conditions that match each other, and a joint capable of appropriately connecting dissimilar members is realized.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a shape memory alloy joint with a tilting function.

0002

[Conventional technology]

The steel ingots used in conventional shape memory alloy joints, apart from some component segregation, Manufactured from a single steel ingot, the steel ingot has the same composition in every part, and the material Generally, the characteristics were also uniform.

0003 However, for example, in structural materials such as dissimilar metal joints for various plant piping, In order to expand the construction area and improve construction efficiency, we are responding to the material strength of each member made of different materials. Shape-memory alloy manufacturing is required as well as joint tightening force after pipe expansion. Material joint products may require graded functional properties with partially different material properties. be.

0004 However, all current shape memory alloy joint products are manufactured from a single steel ingot. The material properties are uniform, and it is not possible to add functionally graded properties. This method is suitable for structural parts that are made of different materials and have significantly different material strengths, such as those mentioned above. There were limits to its application to dissimilar material joint products.

[0005]

[Problem that the idea aims to solve]

In conventional shape memory alloy joints, a single steel ingot is used as mentioned above. The components are the same and the material properties are uniform, such as the above-mentioned Regarding the application of shape memory alloys with functionally graded properties to material joint products, the current situation is It was impossible to manufacture using manufacturing technology.

[0006] The above-mentioned problems occur because shape memory alloys are manufactured from a single steel ingot. Instead, two or more different composite steel ingots with different compositions with different material properties are used. If used, it would also be possible to produce shape memory alloys with functionally graded properties.

[0007] In order to solve the above problems, this invention is manufactured using two or more different types of composite steel ingots. The aim is to provide a shape memory alloy joint with a tilting function.

[0008]

[Means to solve the problem]

The shape memory alloy joint with tilting function of this invention is made of shape memory alloy. The other end is made of a shape memory alloy that has a different composition from the same end. and a diffusion bond with a slope function formed between the same end part and the above-mentioned one end part. It is characterized by being made up of parts.

[0009]

[Effect]

In the above, the method for manufacturing the joint of the present invention involves forming one shape and the other shape having different component compositions. A steel ingot of shape memory alloy is joined and used as a consumable electrode in the electroslag remelting method. After further remelting to obtain a composite steel ingot with the desired different compositions, this is machined. A joint made of a shape memory alloy and having a gradient function is obtained.

0010 When connecting members made of different materials using the joint of the present invention, one of the joints and the other Match the shape memory alloy on one side to the material of the two parts to be connected. By making each component have the same characteristics as the Appropriate construction conditions can be applied, and dissimilar members can be connected appropriately.

[0011] The above allows members of different materials to be connected under construction conditions that match each other. To realize a joint that allows for proper connection of dissimilar members.

0012

【Example】

A joint according to an embodiment of the present invention is shown in FIG. The joint of this example shown in Fig. 1 has a shape notation. One end portion 11 formed from a memory alloy steel ingot and exhibiting shape recovery with a large tightening force, the same end A shape that is formed from a shape memory alloy steel ingot with a different composition from that of part 11 and has a small tightening force. The other end portion 12 exhibiting shape recovery, and the shape between the other end portion 12 and the one end portion 11. The diffusion bonding portion 10 is made of a shape memory alloy having a gradient function.

[0013] The method for manufacturing the joint of this example will be explained with reference to FIGS. 2 and 3. First, figure As shown in Figure 2, the steel ingot materials are shape memory alloy material 1 and material with different components, respectively. 2 is made in advance of forged or cast steel, and the connection 3 is electroslag welded or or by any other suitable method.

[0014] Next, as shown in FIG. 3, remelting is performed using the electroslag remelting method. sand That is, the steel ingot material produced by the above-mentioned electroslag welding etc. is used as a consumable electrode, It is melted through a molten slag 5 in a water-cooled mold 4 made of copper or cast iron, and solidified from the bottom. Close. The steel ingot material is heated directly by the slag 5 from the bottom of the material 2 due to the resistance heat of the molten slag 5. It is melted while creating a pool 6 at the bottom, and after the material 2 is consumed, the connection part 3 is connected to the material 1. The composite steel ingot 7 is melted and gradually solidified from the bottom in the mold 4 to produce an integrated composite steel ingot 7. Ru. Note that 8 represents a power source and 9 represents cooling water.

[0015] The lower part of the composite steel ingot 7 thus obtained has substantially the same composition as the second part of the material, The upper part has substantially the same composition as the material 1 part, and contains materials 1 and 2 corresponding to the connection part 3. At the boundary between the two parts, the components are diffused to some extent due to redissolution, and the components unique to both parts are mutually exclusive. A desired composite steel ingot 7 can be obtained.

[0016] As mentioned above, each part of the steel ingot material used in this example is either forged steel or cast steel. It is also possible to combine two or more different components. How to join Electroslag welding is the best choice, but it is important that the joint does not come apart during remelting and If the conditions such as that the electrical resistance of the joint and the electrical resistance of the joint do not change significantly are satisfied, other Welding methods or other joining methods may also be used.

[0017] The composite steel ingot 7 thus obtained is then subjected to forging, heat treatment, machining and tray processing. Through the coating process, a predetermined functionally graded shape memory alloy, which is the material for the joint shown in Figure 1, is formed. Manufactured, each part exhibits predetermined material properties and slopes under different construction conditions. Used as a functional shape memory alloy joint.

[0018] The joint of this example obtained by the above manufacturing method has a function that is more basic than that of material 1 in the middle. Diffusion bonded part made of a shape memory alloy with a graded function that transitions to the function of material 2 10, which is a joint provided with a member 13 (for example, made of iron and tensile (high strength) and member 14 (for example, made of AL alloy and low tensile strength) When connecting, use a fastener made of material 1 for member 13 during piping work at high temperatures. One end portion 11 showing shape recovery with a large attachment force is tightened, while the other end portion 11 is tightened against the member 14. In this case, the other end portion 12, which shows shape recovery with a small tightening force made of the material 2, is tightened. Therefore, the joint is tightened according to the strength level of each member 13 and member 14. This completes the joint piping work for members 13 and 14.

[0019] As a result of the above, the strength of the joint can be ensured and the joint can be This makes it possible to prevent leakage at the joint, and ensure that the characteristics required for dissimilar material joints are obtained.

[0020] In addition, regarding this implementation, the ingredients shown in Table 1 (Part 1) and Materials (Part 2) ) have been used to produce joints with good results.

[0021]

[Table 1]

[0022] To manufacture the above joint, first the material (Part 1) and the material (Part 2) are vacuum melted. It is melted into a 50Kg steel ingot in a cracking furnace. This is forged and rolled into a predetermined shape, and then The material (Part 1) and the material (Part 2) are joined by electroslag welding. Next Next, the joined composite steel ingot was remelted with electroslag with the material (Part 2) facing down. The composite steel ingot was made into a composite steel ingot, and the joint was manufactured by machining it.

[0023]

[Effect of the idea]

The shape-memory alloy joint with the tilting function of this invention has both ends with different compositions. are made of different shape memory alloys, and the gap between them is a diffusion bonded part with a gradient function. By forming parts with different materials, construction conditions that match each member To realize a joint that can be connected at the same time and that can appropriately connect dissimilar members.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a shape memory alloy joint with a tilting function according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the steel ingot material according to the above embodiment.

FIG. 3 is an explanatory diagram showing a situation in which the steel ingot material according to the above embodiment is being remelted.

[Explanation of symbols] 1,2 Shape memory alloy material 3 Connection part 4 Mold 5 Molten slag 6 Yutama 7 Composite steel ingot 8 Power supply 9 Cooling water 10 Diffusion bonding part 11 One end part showing shape recovery with large tightening force 12 Other end portion showing shape recovery with small tightening force 13,14 Components

Claims (1)

[Scope of utility model registration request] 1. One end portion formed of a shape memory alloy, the other end portion formed of a shape memory alloy having a different composition from the same end portion, and a slope function formed between the other end portion and the one end portion. A shape memory alloy joint with a tilting function, characterized by comprising a diffusion bonded part with a slanting function.