A brazing fixture

Abstract

The utility model relates to processing frock technical field, concretely relates to a brazing frock, including the positioning ring for containing and positioning work piece, bottom plate, set up in the below of positioning ring, top plate, set up in the above of positioning ring, first mica sheet, be pressed in between positioning ring and bottom plate, second mica sheet, be pressed in between positioning ring and top plate, wherein, the bottom plate and positioning ring, top plate and positioning ring all pass through fastener detachably connected and mutually press tightly, the utility model discloses through the direct contact surface between frock and work piece and adds mica sheet, utilizes mica excellent high temperature resistance and does not soak the nature, fundamentally blocked the contact of brazing filler metal and frock metal body. Even if brazing filler metal overflow, also can not lead to work piece and frock adhesion, work piece cooling down can easily take down, avoided because of forcibly separating leads to work piece deformation or surface damage, greatly improved product pass rate.

Description

Technical Field

[0001] This utility model relates to the field of machining tooling technology, specifically to a brazing tooling. Background Technology

[0002] Brazing is a common metal joining process that joins base materials by melting filler metal (brazing filler metal). During brazing, tooling is typically used to position and clamp the workpiece. However, when the heating temperature reaches the melting point of the brazing filler metal, the molten filler metal easily overflows from the weld gap and flows onto the contact surface between the tooling and the workpiece. Existing brazing tooling often uses metal materials (such as stainless steel or heat-resistant steel) directly in contact with the workpiece. The overflowing filler metal adheres to the tooling surface, and after cooling, it is difficult to separate the workpiece from the tooling. Forced disassembly can easily cause workpiece deformation or scratches. The adhered filler metal hardens and firmly adheres to the tooling surface, making cleaning extremely difficult. Furthermore, the filler metal residue on the tooling can affect the positioning accuracy of the workpiece during subsequent clamping, and may even damage the workpiece surface, affecting the quality of subsequent products. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a brazing fixture that can effectively prevent the workpiece from sticking to the fixture during the brazing process, thereby improving product quality and reducing fixture maintenance costs.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A brazing fixture, comprising:

[0006] A locating ring is used to hold and position a workpiece.

[0007] The base plate is located below the positioning ring;

[0008] A top plate is positioned above the positioning ring;

[0009] The first mica sheet is pressed between the positioning ring and the base plate;

[0010] The second mica sheet is pressed between the positioning ring and the top plate;

[0011] The base plate and the positioning ring, as well as the top plate and the positioning ring, are detachably connected and pressed together by fasteners.

[0012] Furthermore, annular positioning grooves are formed on the inner sides of both the lower and upper surfaces of the positioning ring; annular grooves are formed on the upper surface of the base plate and the lower surface of the top plate respectively.

[0013] The lower end face of the first mica sheet is embedded in the annular groove of the base plate, and the upper end face is embedded in the annular positioning groove on the lower surface of the positioning ring.

[0014] The upper end face of the second mica sheet is embedded in the annular groove of the top plate, and the lower end face is embedded in the annular positioning groove on the upper surface of the positioning ring.

[0015] Furthermore, the projection of the inner edge of the annular groove onto the horizontal plane lies within the projection of the inner edge of the annular positioning groove onto the horizontal plane.

[0016] Furthermore, at least one annular overflow groove is formed on the upper surface of the base plate and the lower surface of the top plate, and the depth of the annular overflow groove is less than the depth of the annular groove.

[0017] Furthermore, the annular overflow groove includes two coaxially arranged annular grooves, which are respectively located adjacent to the inner and outer edges of the annular groove.

[0018] Furthermore, the fastener used to connect the base plate and the positioning ring is a first bolt. The first bolt is fixedly connected to the base plate and extends upward through the first countersunk hole opened in the positioning ring, and is tightened by threaded connection with a matching nut.

[0019] Furthermore, the fastener used to connect the top plate and the positioning ring is a second bolt. The second bolt is fixedly connected to the positioning ring and extends upward through the second countersunk hole opened in the top plate, and is tightened by threaded connection with a matching nut.

[0020] Furthermore, it also includes an auxiliary guiding structure, the auxiliary guiding structure comprising:

[0021] At least one guide post fixed to the lower surface of the top plate; and

[0022] At least one guide hole is formed on the upper surface of the positioning ring;

[0023] The guide post and the guide hole are coaxially aligned and interlock during mold closing.

[0024] Furthermore, the upper surface of the base plate and the lower surface of the top plate are both fixedly connected with positioning protrusions, which are used to mate with positioning holes pre-drilled on the surface of the workpiece.

[0025] This utility model provides a brazing fixture. It has the following advantages:

[0026] 1. By adding a mica sheet between the direct contact surfaces of the tooling and the workpiece, the excellent high-temperature resistance and non-wetting properties of mica fundamentally prevent the solder from contacting the metal body of the tooling. Even if the solder overflows, it will not cause the workpiece to stick to the tooling. The workpiece can be easily removed after cooling, avoiding workpiece deformation or surface damage caused by forced separation, and greatly improving the product qualification rate.

[0027] 2. The interlocking structure of the annular groove and the annular positioning groove accurately positions the mica sheet. The sealing structure, with the inner edge of the annular groove located within the inner edge of the annular positioning groove, effectively prevents the solder from penetrating into critical areas inside the workpiece. The annular overflow groove can accommodate and collect any accidentally spilled solder, preventing it from flowing everywhere. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of the explosive decomposition structure;

[0030] Figure 3 This is a structural schematic diagram of the top slab;

[0031] Figure 4 This is a schematic diagram of the structure of this utility model cut in half.

[0032] Figure 5 for Figure 4 A magnified view of part A in the middle;

[0033] In the diagram: 1. Positioning ring; 101. Annular positioning groove; 102. First countersunk hole; 2. Base plate; 3. Top plate; 301. Second countersunk hole; 4. First mica sheet; 5. Second mica sheet; 6. Annular groove; 7. Annular overflow groove; 8. First bolt; 9. Second bolt; 10. Auxiliary guide structure; 1001. Guide post; 1002. Guide hole; 11. Positioning protrusion. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] Please see Figures 1 to 5This utility model provides a brazing fixture, mainly comprising a positioning ring 1, a base plate 2, a top plate 3, a first mica sheet 4, and a second mica sheet 5. The positioning ring 1 is used to accommodate and position the workpiece. The base plate 2 is positioned below the positioning ring 1, and the top plate 3 is positioned above the positioning ring 1. The first mica sheet 4 is pressed between the positioning ring 1 and the base plate 2, and the second mica sheet 5 is pressed between the positioning ring 1 and the top plate 3. The use of mica sheets effectively prevents the workpiece from sticking to the fixture after the brazing filler metal melts and overflows, thus improving workpiece quality and fixture lifespan.

[0036] The positioning ring 1 has a ring structure with annular positioning grooves 101 on the inner sides of both its lower and upper surfaces for precise positioning of the mica sheets. Correspondingly, annular grooves 6 are formed on the upper surface of the base plate 2 and the lower surface of the top plate 3. The lower end face of the first mica sheet 4 is embedded in the annular groove 6 of the base plate 2, and its upper end face is embedded in the annular positioning groove 101 on the lower surface of the positioning ring 1; the upper end face of the second mica sheet 5 is embedded in the annular groove 6 of the top plate 3, and its lower end face is embedded in the annular positioning groove 101 on the upper surface of the positioning ring 1. This groove design ensures that the mica sheets will not shift during assembly and clamping, while also ensuring a tight fit between the mica sheets and the tooling contact surfaces.

[0037] To further optimize the sealing and spill prevention effect, the projection of the inner edge of the annular groove 6 on the horizontal plane is located within the projection of the inner edge of the annular positioning groove 101 on the horizontal plane, thereby effectively preventing the brazing filler metal from penetrating inward.

[0038] The base plate 2 and the positioning ring 1, as well as the top plate 3 and the positioning ring 1, are detachably connected by fasteners. Specifically, the fastener used to connect the base plate 2 and the positioning ring 1 is a first bolt 8. The first bolt 8 is fixedly connected to the base plate 2 and extends upward through the first countersunk hole 102 opened in the positioning ring 1, and is tightened by threaded connection with a mating nut. The fastener used to connect the top plate 3 and the positioning ring 1 is a second bolt 9. The second bolt 9 is fixedly connected to the positioning ring 1 and extends upward through the second countersunk hole 301 opened in the top plate 3, and is tightened by threaded connection with a mating nut. The countersunk hole design ensures that the bolt head does not protrude from the tooling surface, guaranteeing the flatness of the tooling.

[0039] At least one annular overflow groove 7 is also formed on the upper surface of the base plate 2 and the lower surface of the top plate 3. The depth of the annular overflow groove 7 is less than the depth of the annular groove 6, and it is used to collect a small amount of overflowing solder to prevent it from spreading to other parts of the tooling. In this embodiment, the annular overflow groove 7 includes two coaxially arranged annular grooves. The two annular overflow grooves 7 are respectively located adjacent to the inner edge and the outer edge of the annular groove 6, which enhances the anti-overflow capability and ensures that the solder is confined to a specific area.

[0040] To improve assembly accuracy, this utility model also includes an auxiliary guide structure 10. The auxiliary guide structure 10 includes at least one guide post 1001 fixed to the lower surface of the top plate 3, and at least one guide hole 1002 opened on the upper surface of the positioning ring 1. The guide post 1001 and the guide hole 1002 are coaxially corresponding and interlock during mold closing to ensure that the top plate 3 and the positioning ring 1 are aligned, thus preventing damage to the mica sheet due to misalignment.

[0041] In addition, positioning protrusions 11 are fixedly connected to the upper surface of the base plate 2 and the lower surface of the top plate 3. The positioning protrusions 11 are used to mate with positioning holes pre-drilled on the surface of the workpiece to achieve precise positioning of the workpiece and prevent the workpiece from moving during the brazing process.

[0042] Working principle:

[0043] During assembly, the first mica sheet 4 is first embedded into the annular groove 6 of the base plate 2. Then, the positioning ring 1 is placed on the base plate 2, so that the upper end face of the first mica sheet 4 is embedded into the annular positioning groove 101 on the lower surface of the positioning ring 1. Subsequently, the workpiece is placed in the positioning ring 1 and positioned by the positioning protrusion 11. Next, the second mica sheet 5 is embedded into the annular positioning groove 101 on the upper surface of the positioning ring 1, and then the top plate 3 is covered, so that the upper end face of the second mica sheet 5 is embedded into the annular groove 6 of the top plate 3. After the guide post 1001 of the auxiliary guide structure 10 is aligned with the guide hole 1002, the first bolt 8 and the second bolt 9 are used in conjunction with the nut to press and fix the base plate 2, the positioning ring 1, and the top plate 3.

[0044] During brazing, mica sheets, acting as insulation and high-temperature resistant materials, effectively prevent direct contact between the workpiece and the tooling. Even if the brazing filler metal melts and overflows, the mica sheets prevent it from sticking to the tooling, while the annular overflow groove 7 collects excess filler metal. When disassembling the tooling, the components can be easily separated by loosening the fasteners. The mica sheets are replaceable, making maintenance convenient.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A brazing fixture, characterized in that, include: A locating ring is used to hold and position a workpiece. The base plate is located below the positioning ring; A top plate is positioned above the positioning ring; The first mica sheet is pressed between the positioning ring and the base plate; The second mica sheet is pressed between the positioning ring and the top plate; The base plate and the positioning ring, as well as the top plate and the positioning ring, are detachably connected and pressed together by fasteners.

2. The brazing fixture as described in claim 1, characterized in that: The lower surface and the inner side of the upper surface of the positioning ring are both provided with annular positioning grooves; the upper surface of the bottom plate and the lower surface of the top plate are respectively provided with annular grooves. The lower end face of the first mica sheet is embedded in the annular groove of the base plate, and the upper end face is embedded in the annular positioning groove on the lower surface of the positioning ring. The upper end face of the second mica sheet is embedded in the annular groove of the top plate, and the lower end face is embedded in the annular positioning groove on the upper surface of the positioning ring.

3. The brazing fixture as described in claim 2, characterized in that: The projection of the inner edge of the annular groove onto the horizontal plane lies within the projection of the inner edge of the annular positioning groove onto the horizontal plane.

4. The brazing fixture as described in claim 2, characterized in that: At least one annular overflow groove is provided on the upper surface of the base plate and the lower surface of the top plate, and the depth of the annular overflow groove is less than the depth of the annular groove.

5. The brazing fixture as described in claim 4, characterized in that: The annular overflow groove includes two coaxially arranged annular grooves, which are respectively located adjacent to the inner and outer edges of the annular groove.

6. The brazing fixture as described in claim 1, characterized in that: The fastener used to connect the base plate and the positioning ring is a first bolt. The first bolt is fixedly connected to the base plate and extends upward through the first countersunk hole opened in the positioning ring. It is tightened by threaded connection with a matching nut.

7. The brazing fixture as described in claim 1, characterized in that: The fastener used to connect the top plate and the positioning ring is a second bolt. The second bolt is fixedly connected to the positioning ring and extends upward through the second countersunk hole opened in the top plate. It is tightened by threaded connection with a matching nut.

8. The brazing fixture as described in claim 1, characterized in that: It also includes an auxiliary guiding structure, which includes: At least one guide post fixed to the lower surface of the top plate; and At least one guide hole is formed on the upper surface of the positioning ring; The guide post and the guide hole are coaxially aligned and interlock during mold closing.

9. The brazing fixture as described in claim 1, characterized in that, The upper surface of the base plate and the lower surface of the top plate are both fixedly connected with positioning protrusions, which are used to mate with positioning holes pre-drilled on the surface of the workpiece.

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