TWI889641B - Method for manufacturing electromagnetic tube - Google Patents

Abstract

A method for manufacturing an electromagnetic tube, the electromagnetic tube comprises two magnetic tube bodies, a non-magnetic ring and two fusion ring layers. The magnetic tube bodies are arranged at intervals along an axis. The non-magnetic ring is arranged between the magnetic tube bodies. Each fusion ring layer is arranged between the corresponding magnetic tube body and the non-magnetic ring. By having the melting point of the welding ring layers lower than the melting points of the magnetic tube bodies and the non-magnetic ring and each welding ring layer being disposed between the corresponding magnetic tube body and the non-magnetic ring, when the electromagnetic tube is heated, the welding ring layers can be melted and the magnetic tube bodies and the non-magnetic ring can be softened, and then the electromagnetic tube is pressurized along the axis direction, thereby improving the bonding degree and structural strength between the components.

Description

Method for manufacturing electromagnetic tube

The present invention relates to an electromagnetic valve assembly, and more particularly to a method for manufacturing an electromagnetic tube.

Referring to FIG. 1 and FIG. 2 , a conventional electromagnetic tube 1 disclosed in U.S. Patent No. US8253063B2 includes a steel tube body 11, a non-magnetic portion 12 and a drill hole 13. The manufacturing method of the electromagnetic tube 1 is as follows: firstly, an annular groove 111 of the steel tube body 11 is heated by laser, then the non-magnetic portion 12 is arranged in the heated annular groove 111 to melt the non-magnetic portion 12, and then the drill hole 13 is processed after the non-magnetic portion 12 is cooled, so that the non-magnetic portion 12 forms a ring shape and divides the steel tube body 11 into two sections.

Since the non-magnetic part 12 is only melted indirectly by the heated annular groove 111, the bonding between the components is poor. In addition, the non-magnetic part 12 and the steel pipe body 11 are simply stacked, and pores are easily generated at the connection, the structural strength is low, and it is easy to break when under pressure, which needs to be improved.

Therefore, an object of the present invention is to provide a method for manufacturing an electromagnetic tube with improved bonding between components and structural strength.

The manufacturing method of the electromagnetic tube of the present invention comprises the following steps: (A) connecting two magnetically conductive tube bodies, a non-magnetic conductive ring and two fusion ring layers along an axis. The non-magnetic conductive ring is located between the magnetically conductive tube bodies. Each fusion ring layer is located between the corresponding magnetically conductive tube body and the non-magnetic conductive ring. Parts of the magnetically conductive tube bodies extend into the non-magnetic conductive ring. The melting point of the fusion ring layers is lower than the melting point of the magnetically conductive tube bodies and the non-magnetic conductive ring. (B) heating to melt the fusion ring layers and soften the magnetically conductive tube bodies and the non-magnetic conductive ring. (C) After the magnetically conductive tubes, the non-magnetic conductive rings and the welded ring layers are cooled, the magnetically conductive tubes, the non-magnetic conductive rings and the welded ring layers are pressurized along the axis. (D) A channel is machined that extends along the axis and is surrounded and defined by the magnetically conductive tubes and the non-magnetic conductive rings.

The effect of the present invention is that: by virtue of the melting point of the welding ring layers being lower than the melting points of the magnetic tube bodies and the non-magnetic ring and each welding ring layer being disposed between the corresponding magnetic tube body and the non-magnetic ring, when the electromagnetic tube is heated, the welding ring layers can be melted and the magnetic tube bodies and the non-magnetic ring can be softened, and then the electromagnetic tube is pressurized along the axis direction, so that the bonding degree between the components and the structural strength can be improved.

3 , 4 , 5 and 6 , an embodiment of the electromagnetic tube of the present invention includes two magnetically conductive tube bodies 2 , a non-magnetically conductive ring 3 and two welded ring layers 5 .

The magnetically conductive tube bodies 2 are arranged at intervals along an axis L. Each of the magnetically conductive tube bodies 2 includes an inner tube surface 21 and an outer tube surface 22 disposed in opposite directions in the radial direction, and a connecting annular surface 23 connected between the inner tube surface 21 and the outer tube surface 22. The inner tube surface 21 surrounds the axis L. The connecting annular surface 23 extends outwardly from one side connected to the inner tube surface 21 toward the other side connected to the outer tube surface 22. The connecting annular surfaces 23 of the magnetically conductive tube bodies 2 face each other.

In this embodiment, each of the magnetically conductive tubes 2 is made of iron.

The non-magnetic ring 3 is disposed between the magnetically conductive tube bodies 2 and includes an inner ring surface 31 and an outer ring surface 32 disposed in opposite directions in the radial direction, and two side ring surfaces 33 disposed in opposite directions on the axis L and connected between the inner ring surface 31 and the outer ring surface 32. The inner ring surface 31 surrounds the axis L. Each of the side ring surfaces 33 extends inwardly from a side connected to the outer ring surface 32 toward a side connected to the inner ring surface 31.

In this embodiment, the non-magnetic ring 3 is made of copper, but in other variations, the non-magnetic ring 3 can also be made of copper alloy, stainless steel, aluminum or other non-magnetic materials.

The inner tube surfaces 21 of the magnetically conductive tube bodies 2 and the inner ring surface 31 of the non-magnetic conductive ring 3 together define a channel 4 extending along the axis L.

Each of the welding annular layers 5 is disposed between the corresponding connecting annular surface 23 and the side annular surface 33 .

In this embodiment, the melting points of the welding ring layers 5 are lower than the melting points of the magnetically conductive tubes 2 and the non-magnetically conductive ring 3, and the welding ring layers 5 are welding sheets containing silver.

When the electromagnetic tube is heated, the welding ring layers 5 will melt and the magnetic tube bodies 2 and the non-magnetic ring 3 will soften. When the electromagnetic tube is compressed along the axis L, the welding ring layers 5 can be used to join the magnetic tube bodies 2 and the non-magnetic ring 3.

Referring to FIG. 3 and FIG. 7 to FIG. 9 , an embodiment of a method for manufacturing an electromagnetic tube of the present invention comprises the following steps:

Step S1: As shown in FIG. 7 and FIG. 8 , two magnetically conductive tubes 2, a non-magnetically conductive ring 3 and two fusion ring layers 5 are connected along an axis L. The non-magnetically conductive ring 3 is located between the magnetically conductive tubes 2. Each fusion ring layer 5 is located between the corresponding magnetically conductive tubes 2 and the non-magnetically conductive ring 3. Parts of the magnetically conductive tubes 2 extend into the non-magnetically conductive ring 3.

Step S2: As shown in FIG. 9 , the magnetically conductive tubes 2 , the non-magnetically conductive rings 3 and the welded ring layers 5 are placed in a vacuum chamber 9 , and are heated by far infrared rays to melt the welded ring layers 5 and soften the magnetically conductive tubes 2 and the non-magnetically conductive rings 3 .

In this embodiment, the vacuum degree in the vacuum chamber 9 is -0.1~0 bar, the heating temperature is 800~1050°C, and the softening degrees of the magnetically conductive tube 2 and the non-magnetically conductive ring 3 are 40% and 60~70% respectively.

Step S3: As shown in FIG. 10 , in the vacuum chamber 9, the magnetic tube bodies 2, the non-magnetic rings 3 and the welded ring layers 5 are pressurized along the axis L so that the atoms of the magnetic tube bodies 2 and the non-magnetic rings 3 diffuse on the surface, and the atoms of each welded ring layer 5 on two opposite sides of the axis L diffuse to improve the bonding degree between the components. In this embodiment, the magnetic tube bodies 2 are pressurized in two directions along the axis L, and the pressurization pressure is 4-5 bar, but in other variations, any of the magnetic tube bodies 2 can also be pressurized along the axis L. During the pressurization process, the heating temperature is maintained at about 1000°C.

In this embodiment, the welding ring layers 5 melt after being heated, and the magnetic tube bodies 2 and the non-magnetic ring 3 soften after being heated, which is convenient for pressurization. In addition, when the magnetic tube bodies 2, the non-magnetic ring 3 and the welding ring layers 5 are pressurized along the direction of the axis L, the magnetic tube bodies 2, the non-magnetic ring 3 and the welding ring layers 5 can be closely attached to avoid the generation of bubbles between the components, which can improve the bonding degree and structural strength between the components, and can be applied in a high-pressure environment.

Step S4: As shown in FIG. 5 , after the magnetically conductive tubes 2, the non-magnetically conductive rings 3 and the welded ring layers 5 are cooled, a channel 4 extending along the axis L and surrounded and defined by the magnetically conductive tubes 2 and the non-magnetically conductive rings 3 is processed, and the outer tube surface 22 of the magnetically conductive tubes 2 is processed into a desired shape.

In this embodiment, one of the magnetically conductive tube bodies 2 is a solid tube. The other magnetically conductive tube body 2 is a hollow tube and includes a tube hole 24 extending along the direction of the axis L and for a portion of one of the magnetically conductive tube bodies 2 to extend into. The tube hole 24 has a large-diameter section 241 adjacent to one of the magnetically conductive tube bodies 2, a small-diameter section 242 extending outward from the large-diameter section 241 and having a smaller diameter than the large-diameter section 241, and a shoulder 243 connected to the large-diameter section 241 and the small-diameter section 242. A portion of one of the magnetically conductive tube bodies 2 extends into the tube hole 24 and pushes against the shoulder 243. In this way, the magnetically conductive tube bodies 2 can be prevented from slipping off each other in subsequent processing. However, in other variations, as shown in FIG. 10 to FIG. 12 , the magnetically conductive tubes 2 are all solid tubes and partially extend into the non-magnetically conductive ring 3 , and the channel 4 is processed after the above-mentioned heating and pressurizing processing steps.

The present invention has a melting point of the welding ring layers 5 lower than that of the magnetic tube bodies 2 and the non-magnetic ring 3 and each welding ring layer 5 is disposed between the corresponding magnetic tube body 2 and the non-magnetic ring 3. When the electromagnetic tube is heated, the welding ring layers 5 can be melted and the magnetic tube bodies 2 and the non-magnetic ring 3 can be softened. Then, the electromagnetic tube is pressurized along the direction of the axis L, which can improve the bonding degree and structural strength between the components. Therefore, the purpose of the present invention can be achieved.

However, the above is only an example of the implementation of the present invention, and it should not be used to limit the scope of the implementation of the present invention. All simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still within the scope of the patent of the present invention.

2: Magnetic tube body 21: Inner tube surface 22: Outer tube surface 23: Connecting ring surface 24: Tube hole 241: Large diameter section 242: Small diameter section 243: Shoulder 3: Non-magnetic ring 31: Inner ring surface 32: Outer ring surface 33: Side ring surface 4: Channel 5: Welding ring layer 9: Vacuum chamber L: Axis S1~S4: Steps

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is a schematic diagram illustrating a processing process of an existing electromagnetic tube disclosed in U.S. Patent No. US8253063B2; FIG. 2 is a cross-sectional view of the existing electromagnetic tube; FIG. 3 is a flow chart illustrating an embodiment of the method for manufacturing the electromagnetic tube of the present invention; FIG. 4 is a side view illustrating an electromagnetic tube manufactured by the embodiment; FIG. 5 is a cross-sectional view of FIG. 4; FIG. 6 is a partial enlarged view of FIG. 5; FIG. 7 to FIG. 9 are schematic diagrams illustrating the manufacturing process of the embodiment; and FIG. 10 to FIG. 12 are schematic diagrams illustrating a variation of the embodiment.

S1~S4: Steps

Claims (3)

A method for manufacturing an electromagnetic tube comprises the following steps: (A) connecting two magnetic tube bodies, a non-magnetic ring and two welding ring layers along an axis, wherein the non-magnetic ring is located between the magnetic tube bodies, each welding ring layer is located between the corresponding magnetic tube body and the non-magnetic ring, and portions of the magnetic tube bodies extend into the non-magnetic ring, and the melting points of the welding ring layers are lower than the melting points of the magnetic tube bodies and the non-magnetic ring; (B) The magnetic tube bodies, the non-magnetic rings and the welded ring layers are placed in a vacuum chamber and heated with far infrared rays to melt the welded ring layers and soften the magnetic tube bodies and the non-magnetic rings. The vacuum degree in the vacuum chamber is -0.1~0 bar and the heating temperature is 800~1050°C; (C) The magnetic tube bodies, the non-magnetic rings and the welded ring layers are pressurized along the axis; and (D) After the magnetic tube bodies, the non-magnetic rings and the welded ring layers are cooled, a channel extending along the axis and surrounded and defined by the magnetic tube bodies and the non-magnetic rings is processed. A method for manufacturing an electromagnetic tube as described in claim 1, wherein in step (A), one of the magnetically conductive tube bodies is a solid tube, and the other magnetically conductive tube body is a hollow tube and includes a tube hole extending along the direction of the axis and for a portion of one of the magnetically conductive tube bodies to extend into, the tube hole has a large aperture section adjacent to one of the magnetically conductive tube bodies, a small aperture section extending outward from the large aperture section and having an aperture smaller than the aperture of the large aperture section, and a shoulder connected to the large aperture section and the small aperture section, wherein a portion of one of the magnetically conductive tube bodies extends into the tube hole and pushes against the shoulder. A method for manufacturing an electromagnetic tube comprises the following steps: (A) connecting two magnetic tube bodies, a non-magnetic ring and two welding ring layers along an axis, wherein the non-magnetic ring is located between the magnetic tube bodies, each welding ring layer is located between the corresponding magnetic tube body and the non-magnetic ring, and portions of the magnetic tube bodies extend into the non-magnetic ring, and the melting points of the welding ring layers are lower than the melting points of the magnetic tube bodies and the non-magnetic ring; (B) placing the magnetic tube bodies, the non-magnetic ring and the welding ring layers in a vacuum chamber and heating them with far infrared rays to melt the welding ring layers and soften the magnetic tube bodies and the non-magnetic ring; (C) Pressurizing the magnetic tubes, the non-magnetic rings and the welded ring layers in the vacuum chamber at a pressure of 4 to 5 bar; and (D) After the magnetic tubes, the non-magnetic rings and the welded ring layers are cooled, a channel extending along the axis and surrounded and defined by the magnetic tubes and the non-magnetic rings is processed.

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