BRAZING WIRE, FORMING METHOD OF BRAZING WIRE AND FORMING MOLD OF BRAZING WIRE

Abstract

A brazing wire includes a brazing tube having an inner cavity and a flux filled in the inner cavity. A trench is provided on an outer peripheral surface of the brazing tube, and the trench extends along an axis of the brazing tube or spirally extends around the axis. A forming mold of the brazing wire includes a mold body having a molding cavity therein. An inner wall of the molding cavity is provided with a protrusion. When the brazing wire passes through the forming mold, the protrusion is used to form the trench. The forming method of the brazing wire includes the following steps. The brazing tube passes through the forming mold, and the trench is formed on the outer peripheral surface of the brazing tube by the protrusion. The trench extends along the axis of the brazing tube or spirally extends around the axis.

Claims

1. A brazing wire, comprising: a brazing tube, having an inner cavity; and a flux, filled in the inner cavity of the brazing tube; wherein the brazing tube is provided with a trench on an outer peripheral surface, and the trench extends along an axis of the brazing tube or spirally extends around the axis of the brazing tube.

2. The brazing wire according to claim 1, wherein a cross section of the trench is V-shaped.

3. The brazing wire according to claim 2, wherein a depth of the trench is ¼ to ⅗ of a wall thickness of the brazing tube.

4. The brazing wire according to claim 1, wherein a number of the trench is three or more.

5. The brazing wire according to claim 4, wherein the trenches are uniformly distributed along a circumferential direction.

6. A forming mold of a brazing wire, the forming mold comprising a mold body, wherein a molding cavity is provided in the mold body; wherein an inner wall of the molding cavity is provided with a protrusion, when the brazing wire passes through the forming mold, the protrusion is adapted to form a trench on an outer peripheral surface of a brazing tube.

7. The forming mold of the brazing wire according to claim 6, wherein a cross-sectional shape of the protrusion is V-shaped, and a tip portion of the protrusion faces a center of the forming mold.

8. The forming mold of the brazing wire according to claim 6, wherein a number of the protrusion is three or more.

9. A forming method of a brazing wire, the forming method comprising the following steps: enabling a brazing tube to pass through a forming mold, and forming a trench on an outer peripheral surface of the brazing tube by a protrusion provided on an inner wall of a molding cavity of the forming mold, wherein the trench extends along an axis of the brazing tube or spirally extends around the axis of the brazing tube.

10. The forming method of the brazing wire according to claim 9, further comprising the following steps: after the trench is formed on the brazing tube, enabling the brazing tube to pass through the forming mold with a circular cross-section, and to narrow an opening of the trench on the outer peripheral surface of the brazing tube, wherein the forming mold with the circular cross-section is a forming mold having a molding cavity that has the circular cross-section.

11. The brazing wire according to claim 2, wherein a number of the trench is three or more.

12. The brazing wire according to claim 3, wherein a number of the trench is three or more.

13. The brazing wire according to claim 11, wherein the trenches are uniformly distributed along a circumferential direction.

14. The brazing wire according to claim 12, wherein the trenches are uniformly distributed along a circumferential direction.

15. The forming mold of the brazing wire according to claim 7, wherein a number of the protrusion is three or more.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG. 1 is a schematic cross-sectional view of a first embodiment of a brazing wire in the disclosure.

[0038] FIG. 2 is a schematic cross-sectional view of a second embodiment of a brazing wire in the disclosure.

[0039] FIG. 3 is a schematic cross-sectional view of a first embodiment of a forming mold of a brazing wire in the disclosure.

[0040] FIG. 4 is a schematic view of a molding process of a first embodiment of a forming method of a brazing wire of the disclosure.

[0041] FIG. 5 is a comparison diagram of a moisturizing effect of brazing wire without a trench and with a trench.

[0042] The names of the components corresponding to the corresponding reference signs in the figures are: 11, brazing tube; 12, flux; 13, trench; 21, mold body; 22, molding cavity; 23, protrusion.

DESCRIPTION OF EMBODIMENTS

[0043] In order to make the purpose, technical solutions, and advantages of the disclosure more clear, the following further describes the disclosure in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the disclosure and not to limit the disclosure, that is, the described embodiments are only a part of the embodiments of the disclosure, rather than all the embodiments. The elements of the embodiments of the disclosure generally described and illustrated in the drawings herein may be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely represents selected embodiments of the disclosure. Based on the embodiments of the disclosure, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope to be protected by the disclosure.

[0045] It should be noted that the terms “first” and “second” and other relational terms that may appear in the specific embodiments of the disclosure are only used to distinguish one object or operation from another object or operation. It is not necessarily required or implied that there is any such actual relationship or order between these objects or operations. Moreover, the possible terms “include”, “comprise” or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements which are not explicitly listed, or further include elements inherent to this process, method, article, or equipment. If there are no further restrictions, the possible occurrence of the sentence “includes one . . . ” does not exclude the existence of other identical elements in the process, method, article, or equipment that includes the element.

[0046] In the description of the disclosure, unless otherwise clearly specified and limited, the terms “arranged”, “linked”, and “connected” that may appear should be interpreted in a broad sense. For example, they may be fixed or detachable connections, or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the two components. For those skilled in the art, the specific meaning of the above terms in the disclosure should be comprehensible through specific circumstances.

[0047] In the description of the disclosure, unless otherwise clearly stipulated and limited, the term “provided with” that may appear should be interpreted in a broad sense. For example, the “provided” object can be a part of the subject, or it can be separated arranged from the subject and connected to the subject. The connection can be detachable or non-detachable. For those skilled in the art, the specific meaning of the above terms in the disclosure should be comprehensible through specific circumstances.

[0048] The disclosure will be further described in detail below in conjunction with embodiments.

[0049] The first embodiment of brazing wire in the disclosure.

[0050] As shown in FIG. 1, the brazing wire is used for the brazing of glasses, and the brazing wire includes a brazing tube 11 and a flux 12. The brazing tube 11 is a seamless tube with an inner cavity, and the flux 12 is filled in the inner cavity of the brazing tube 11. The manufacturing method of the brazing tube 11 and the filling method of the flux 12 belong to existing technology, and will not be further described in detail in the disclosure. In order to prevent the flux 12 from absorbing moisture and therefore affecting the activity of the flux 12, both ends of the brazing tube 11 are closed.

[0051] The brazing wire in the disclosure is unique in that, a plurality of trenches 13 are provided on an outer peripheral surface of the brazing tube 11, and the trench 13 has a V-shaped cross section and extends along an axis of the brazing tube 11. In this embodiment, there are eight trenches 13, which are uniformly distributed along the circumferential direction. The depth of the trench 13 is ½ of the wall thickness of the brazing tube 11, the width of opening is 0.08 h, and h is the depth of the trench. Through such configuration, it is possible to balance the thermal conductivity and structural strength of the brazing tube 11, and make the cross section of the brazing wire to be similar to a circle. As a preferred embodiment, the depth of the trench 13 is ¼ to ⅗ of the wall thickness of the brazing tube 11, and the width of the trench 13 after narrowing is 0.01 h to 0.12 h.

[0052] As shown in FIG. 4, a forming method of the above-mentioned brazing wire is as follows, and this method is also the first embodiment of the forming method of the brazing wire of the disclosure.

[0053] Step 1: The flux 12 is filled into the seamless brazing tube 11.

[0054] Step 2: Passing the brazing tube 11 filled with flux 12 through a wire drawing die shown in FIG. 3 to form continuous trenches 13 on the brazing tube 11. The cross section of the trenches 13 is V-shaped, which is convenient for processing and facilitates subsequent diameter reduction. Using a wire drawing die to shape the wire belongs to an existing technology. The unique feature of the disclosure is that, the protrusions 23 are provided on the inner wall of the molding cavity 22 of the wire drawing die. When the brazing wire passes through the wire drawing die, the protrusions 23 allow the trenches 13 to be formed on the outer peripheral surface of the brazing tube 11 of the brazing wire, and the trenches 13 extend along the axis of the brazing tube 11.

[0055] Step 3: After the trenches 13 are formed on the brazing wire, the diameter of the brazing tube 11 of the brazing wire is reduced through a forming mold with a circular cross-section, so that the openings of the trenches 13 on the outer peripheral surface of the brazing tube 11 are narrowed. The forming mold with the circular cross-section is a common wire drawing die, and the cross-section of the molding cavity 22 is circular.

[0056] The principle of conventional brazing process is that, the flux first melts and removes the oxide film of the base material, and then the brazing filler metal melts and moisturizes the base material. The melting temperature of flux is generally lower than the melting temperature of brazing filler metal by about 30° C. The activity of flux directly affects the flow and spread of brazing filler metal, which in turn affects the brazing effect. In the brazing process, there are three heat transfer methods for brazing wire, which are thermal conduction, convection, and radiation. No matter which heating method is used, the heat energy needs to be transferred to the flux through the brazing filler metal on the surface. When the melting temperature of brazing filler metal and flux differs by about 30° C., it is possible that brazing filler metal will melt first, or brazing filler metal and flux will melt at the same time. Under the circumstances, the flux is not able to remove the oxide film on the base material in time, which will affect the flow and spread of brazing filler metal, please see (a) of FIG. 5. Regarding the glass brazing wire with trench of the disclosure, the brazing filler metal has a trench on the surface of the brazing filler metal, and the brazing filler metal skin at the trench is thinned. When heating is performed in the brazing process, the heat energy can be quickly transferred to the flux, so that the flux melts faster than the brazing filler metal, and the flux removes the oxide film of the base material quickly. The brazing filler metal has a better flow-laying effect after melting, as shown in (b) of FIG. 5. Moisturizing conditions in FIG. 5: brazing wire is Ag40Cu19Zn21Cd, weight is 0.2 g, temperature is 700° C., and time is 5 min.

[0057] In addition to facilitating automatic brazing of glasses, the above brazing wire can also achieve brazing connection with the least flux, so that the amount of flux can be accurately controlled to achieve the purpose of protecting the environment.

[0058] The second embodiment of brazing wire in the disclosure.

[0059] The difference of the brazing wire between the first embodiment and the second embodiment is that, as shown in FIG. 2, in the embodiment, the width of the trench 13 on the outer peripheral surface of the brazing tube 11 is relatively large, and is not subjected to the diameter reduction process in the above step 3.

[0060] The first embodiment of the forming mold of the brazing wire in the disclosure.

[0061] As shown in FIG. 3, the forming mold of the brazing wire is provided with the protrusions 23 on the inner wall of the molding cavity 22. When the brazing wire passes through the forming mold, the protrusions 23 are used to respectively form the trenches 13 on the outer peripheral surface of the brazing tube 11.

[0062] The second embodiment of the forming method of the brazing wire in the disclosure.

[0063] The difference between the first embodiment and the second embodiment is that, the forming method of the second embodiment only includes step 1 and step 2 in the first embodiment, and does not include the diameter reduction process of step 3.

[0064] The third embodiment of the forming method of the brazing wire in the disclosure.

[0065] This embodiment is different from the first or the second embodiment in that, this embodiment first separately performs the processing in step 1 and step 2 on the brazing tube 11, and finally fills the flux 12.

[0066] In the above embodiment of the brazing wire, the cross section of each trench 13 is V-shaped. In other embodiments of the brazing wire, the cross section of the trench 13 may also be other shapes, such as U-shaped, arc-shaped, trapezoidal, and so on. Correspondingly, in other embodiments of the forming mold of the brazing wire, each protrusion 23 on the inner wall of the molding cavity 22 may also have other shapes, such as U-shaped, arc-shaped, trapezoidal, and so on.

[0067] In other embodiments of brazing wire, the number of trenches 13 can also be increased or decreased, for example, 3, 4, 5, 6, 7, 9, or 10 trenches, etc. may be provided, or only 1 or 2 trenches may be provided. Correspondingly, in other embodiments of the forming mold of the brazing wire, the protrusions 23 on the inner wall of the molding cavity 22 can also be provided in quantity of 3, 4, 5, 6, 7, 9, or 10, etc.; alternatively, only 1 or 2 protrusions may be provided.

[0068] The above are only the preferred embodiments of this disclosure and are not intended to limit this disclosure. The scope to be protected by the disclosure is subject to the claims. Any equivalent structural changes made using the content of the description and drawings of this disclosure are not intended to limit this disclosure, and should be included in the scope to be protected by the disclosure as well.