Special induction heating coil for rivet annealing

Abstract

The utility model discloses a special induction heating coil for rivet annealing, and relates to the technical field of rivet heating annealing, the induction heating coil is a loop structure which is formed by winding the same section of metal piece, one end of the loop structure is a coil main body, and the other end of the loop structure is a coil base, at least one induction heating hole for placing rivets is formed in the closed structure; the coil base is connected with an induction heating power supply through a cable. According to the utility model, accurate positioning of a rivet heating area can be realized, and uniform temperature distribution in the heating process is ensured, so that the quality of rivet annealing treatment is effectively ensured, and the qualified rate and the reliability of products are improved; the operation process is simple and easy to understand, and the heating process is stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of rivet heating and annealing technology, and more specifically, it relates to an induction heating coil specifically for rivet annealing. Background Technology

[0002] In specific industries such as high-speed rail, there is a widespread demand for rivets with high strength and hardness for efficient riveting between sheet metal parts. These rivets, typically 100mm in shape, are... Figure 1 As shown. This type of rivet has a unique shape design. Its characteristic is that during the riveting process using a special tool, the end of the rivet 100 can protrude and form an oval bulge, thereby tightly riveting and fixing the sheet metal 200. The deformed shape of the rivet 100 after riveting is as follows... Figure 2 As shown in the diagram, the left side is a schematic diagram of the external structure, and the right side is a sectional view. However, in practical applications, the high strength and hardness of this type of rivet pose a challenge to the riveting operation because the material itself is difficult to deform. To solve this problem, it is usually necessary to anneal a local area of ​​the rivet to reduce the hardness of that area and enhance its deformability, thereby facilitating the riveting operation while maintaining the overall high strength and hardness of the rivet. The area of ​​the rivet that is annealed by heating 100 is shown below. Figure 3 As shown in the figure, point A is the rivet heating and annealing area.

[0003] The key to annealing is precise and uniform heating of the specific annealing area of ​​the rivet to avoid adverse effects on surrounding areas; otherwise, the entire rivet may be scrapped due to improper heat treatment. Traditional heating methods, such as flame heating or oven baking, cannot achieve such precise control and cannot meet the stringent requirements of rivet annealing.

[0004] In view of the aforementioned problems, induction heating technology, as a method capable of achieving precise and uniform heating, has been proposed as an effective solution to the annealing heating problem of rivets. Induction heating technology relies on a dedicated induction heating coil to precisely control the heating area, thereby ensuring that only a designated area of ​​the rivet is annealed without affecting other parts. However, such a dedicated induction heating coil does not currently exist and remains to be invented. Utility Model Content

[0005] To address this problem in practical applications, the purpose of this invention is to provide a special induction heating coil for rivet annealing, which can achieve precise and uniform heating of rivets, ensuring the quality of rivet annealing. The specific solution is as follows:

[0006] An induction heating coil for rivet annealing is disclosed. The induction heating coil is a loop structure formed by winding the same piece of metal, with one end being the coil body and the other end being the coil base. The end of the coil body away from the coil base is a closed structure, and at least one induction heating hole for placing the rivet is provided on the closed structure. The coil base is connected to an induction heating power supply via a cable.

[0007] Furthermore, the end of the coil base away from the coil body is an open structure, and an insulating partition is provided between the gaps in the open structure and along its axial direction.

[0008] Furthermore, the induction heating hole is designed as a round hole that matches the shape of the rivet.

[0009] Furthermore, it also includes a shape-holding device, a support device, and a position-adjusting device, wherein the support device is used to support and fix the induction coil; the shape-holding device is used to prevent deformation of the coil body; and the position-adjusting device is used to adjust the rivet heating height.

[0010] Furthermore, the shape holding device includes a shape holding seat and a shape holding pressure plate, wherein the coil body is embedded in the shape holding seat, the shape holding pressure plate presses on the shape holding seat and the coil body, and the shape holding seat has at least one through hole corresponding to the induction heating hole.

[0011] Furthermore, each of the through holes is provided with a rivet positioning element, which is fixed on the shape retaining seat and used to position the rivet.

[0012] Furthermore, the support device includes a front support member, a rear support member, a base plate, and side plates. The front support member is supported on the bottom of the coil base, the rear support member is supported on the bottom of the shape-retaining pressure plate, the base plate is supported on the bottom of the front and rear support members, and the side plates are fixed to the left and right sides of the device.

[0013] Furthermore, the position adjustment device includes a position adjustment seat, a rivet base, a base cover plate, a guide post, a spring, and an adjustment bolt. The position adjustment seat has a rivet base at its top corresponding to the position of the induction heating hole. The rivet base is fixed by the rivet cover plate. The guide post passes through the base plate and is connected to the bottom of the position adjustment seat. The spring is provided on the guide post. The adjustment bolt is spirally connected to the base plate and passes through the base plate and is connected to the bottom of the position adjustment seat.

[0014] Furthermore, the side plate of the support device is also locked to the position adjustment seat by locking screws.

[0015] Furthermore, the position adjustment device also includes a cooling water pipe and a cooling hole. One end of the cooling water pipe is connected to the cooling hole provided in the position adjustment seat, and the other end is connected to the circulation hole in the induction coil and connected to the cooling machine.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] (1) Through the precise design of the induction heating coil, the heating area of ​​the rivet can be accurately positioned and the temperature distribution during the heating process can be made uniform, thereby effectively ensuring the quality of the rivet annealing process and improving the product qualification rate and reliability.

[0018] (2) The operation process of this special induction heating coil is simple and easy to understand, requiring no complicated operation skills, and the heating process is stable and reliable, reducing errors and risks caused by human operation and further improving production efficiency.

[0019] (3) The application of special induction heating coils has greatly improved the efficiency of rivet annealing, making it possible to mass-produce high-strength and high-hardness rivets and meet the large demand for rivets in industries such as high-speed rail. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a rivet;

[0021] Figure 2 This is a schematic diagram of a structure for riveting plates together.

[0022] Figure 3 To illustrate the structural diagram of the rivet heating and annealing zone;

[0023] Figure 4 This is a top view of the induction heating coil in Embodiment 1 of this utility model;

[0024] Figure 5 This is a side view of the induction heating coil in Embodiment 1 of this utility model;

[0025] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model;

[0026] Figure 7 This is a top view of Embodiment 2 of the present invention;

[0027] Figure 8 This is a side view of Embodiment 2 of the present invention;

[0028] Figure 9 This utility model Figure 8 Sectional view at point BB;

[0029] Figure 10This is a front view of Embodiment 2 of the present invention;

[0030] Figure 11 This utility model Figure 10 Sectional view at point CC.

[0031] Reference numerals: 1. Coil body; 2. Coil base; 3. Induction heating hole; 4. Insulating partition; 5. Shape retaining seat; 6. Shape retaining pressure plate; 7. Rivet positioning component; 8. Front support component; 9. Rear support component; 10. Base plate; 11. Side plate; 12. Position adjustment seat; 13. Rivet base support; 14. Base support cover plate; 15. Guide post; 16. Spring; 17. Adjusting bolt; 18. Locking screw; 19. Cooling water pipe; 20. Cooling hole;

[0032] 100. Rivet; 200. Sheet metal. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0034] Example 1

[0035] like Figure 4-5 As shown, an induction heating coil for rivet annealing is a circuit structure formed by winding a single metal component, with one end being the coil body 1 and the other end being the coil base 2. This metal component can be made of copper. The coil body 1 and the coil base 2 are an integral structure. The end of the coil body 1 furthest from the coil base 2 is a closed structure, with at least one induction heating hole 3 provided on this closed structure, and the rivet 100 is located within the induction heating hole 3. The end of the coil base 2 furthest from the coil body 1 is an open structure, with insulating partitions 4 provided between the gaps in this open structure and along its axial direction. The coil base 2 is connected to an induction heating power supply (not shown in the figure) via a cable. When the coil base 2 is energized, since the coil body 1 and the coil base 2 are a single-circuit structure, the coil body 1 induction heats and anneals the rivet 100 placed within the induction heating hole 3.

[0036] Preferably, the induction heating hole 3 is a round hole that matches the shape of the rivet 100, which ensures that the rivet 100 is heated more evenly and the area of ​​induction heating is controllable.

[0037] In addition, to improve the induction heating efficiency of the rivet 100, in this embodiment, the number of induction heating holes 3 is five. The five induction heating holes 3 are evenly arranged along the axial direction of the coil body 1, and each pair of induction heating holes 3 is interconnected. By simultaneously heating and annealing the five rivets 100, production efficiency is improved.

[0038] Example 2

[0039] The technical feature that distinguishes this embodiment from Embodiment 1 is that, as Figure 6-11 As shown: This embodiment also includes a shape-holding device, a support device, and a position adjustment device. The support device is used to support and fix the induction heating coil; the shape-holding device is used to prevent the coil body 1 from deforming; and the position adjustment device is used to adjust the heating height of the rivet 100.

[0040] Specifically, the shape holding device includes a shape holding seat 5 and a shape holding pressure plate 6. The shape holding seat 5 is arranged on the same plane as the coil body 1. The shape holding seat 5 is provided with a holding hole (not shown in the figure) that matches the shape of the coil body 1. The coil body 1 is embedded in the shape holding seat 5 through the holding hole. The shape holding pressure plate 6 presses on the shape holding seat 5 and the coil body 1. The shape holding seat 5 is provided with five through holes (not shown in the figure) corresponding to the induction heating hole 3 for the rivet 100 to pass through.

[0041] Each through hole is also provided with a rivet positioning element 7, which is fixed on the shape retaining seat 5 and used to position the rivet 100. In one possible embodiment, the rivet positioning element 7 is a cylinder with a convex cross-section. The shape retaining pressure plate 6 is provided with a step (not shown in the figure) that matches the convex structure to fix the rivet positioning element 7. The cylinder has a hole (not shown in the figure) along its longitudinal center position for the rivet 100 to pass through, which is used to position the rivet 100.

[0042] The support device includes a front support member 8, a rear support member 9, a base plate 10, and a side plate 11. The front support member 8 is supported on the bottom of the coil base 2, the rear support member 9 is supported on the bottom of the shape-retaining pressure plate 6, the base plate 10 is supported on the bottom of the front support member 8 and the rear support member 9, and the side plate 11 is fixed to the left and right sides of the base plate 10 by bolts. At the same time, the side plate 11 extends upward to the left and right sides of the shape-retaining pressure plate 6 by bolts.

[0043] The position adjustment device includes a position adjustment seat 12, rivet base supports 13, a base cover plate 14, guide posts 15, springs 16, and adjusting bolts 17. The position adjustment seat 12 is located within the space enclosed by the front support member 8, the rear support member 9, the base plate 10, and the shape-holding seat 5. Five rivet base supports 13 are provided on the top of the position adjustment seat 12. The positions of the rivet base supports 13 correspond one-to-one with the positions of the induction heating holes 3. The rivet base supports 13 are fixed by the base cover plate 14 and are used to support the rivets 100. Preferably, the shape of the rivet base supports 13 matches the shape of the rivet heads. The guide posts 15 pass through the base plate 10 and connect to the bottom of the position adjustment seat 12. Springs 16 are provided on the guide posts 15, which, together with the springs 16, provide guidance during the position adjustment process. The adjusting bolts 17 are spirally connected to the base plate 10 and pass through the base plate 10 to connect to the bottom of the position adjustment seat 12. By turning the adjusting bolt 17, the position adjusting seat 12 and the rivet base 13 can be moved up or down to adjust the position of the rivet 100.

[0044] In addition, the side plate 11 of the support device is provided with locking holes (not shown in the figure), and the locking screws 18 lock the side plate 11 to the position adjustment seat 12 through the locking holes. Preferably, each side plate 11 has two locking screws 18, for a total of four locking screws 18.

[0045] More specifically, the position adjustment device also includes a cooling water pipe 19 and a cooling hole 20. One end of the cooling water pipe 19 is connected to the cooling hole 20 provided inside the position adjustment base 12, and the other end is connected to the circulation hole (not shown in the figure) inside the induction heating coil, and then connected to the cooling machine. After the cooling machine is started, cooling water enters the cooling hole 20 from the cooling water pipe 19 to cool the parts on the position adjustment device, preventing the position adjustment device from affecting the operator's operation due to temperature rise. At the same time, cooling water also flows in the circulation hole of the induction heating coil circuit structure, which can prevent high temperature from damaging the induction heating coil.

[0046] The steps for heat annealing rivets are as follows:

[0047] 1. First, determine the heating position of rivet 100 to ensure that the heating area of ​​rivet 100 is accurate;

[0048] 2. Loosen the four locking screws 18 on both sides of the coil to adjust the position of the rivet 100;

[0049] 3. Tighten the adjusting bolt 17 as needed to move the rivet base 13 up or down, thereby accurately determining the position of the rivet 100 in the coil body 1 to ensure the uniformity and effectiveness of heating.

[0050] 4. After the position is determined, tighten the four locking screws 18 on both sides of the coil to fix the position of the rivet 100.

[0051] 5. Next, insert five rivets 100 into the five induction heating holes 3 of the coil body 1 respectively, in preparation for heating;

[0052] 6. The induction heating coil is energized and heats up. After a few seconds, the rivet 100 reaches the set annealing temperature. The heating time and temperature are strictly controlled during the heating process to avoid unnecessary damage to the rivet 100.

[0053] 7. After heating is complete, stop heating and remove rivet 100, allowing it to cool naturally to room temperature to stabilize and optimize the internal structure of rivet 100.

[0054] Through the above steps, the entire annealing process of the rivet is completed. This process not only ensures the precise heating area of ​​the rivet, guarantees the uniformity and effectiveness of heating, and ensures the quality of the rivet annealing treatment, but also makes the entire operation convenient, reliable, and highly efficient, providing excellent conditions for subsequent riveting operations.

[0055] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An induction heating coil for rivet annealing, characterized by, The induction heating coil is a loop structure with one end as a coil body and the other end as a coil base, which is wound by the same metal piece, wherein: the end of the coil body away from the coil base is a closed structure, and at least one induction heating hole for placing a rivet is formed on the closed structure; the coil base is connected to an induction heating power source through a cable.

2. The rivet annealing special induction heating coil according to claim 1, characterized in that, The end of the coil base away from the coil body is an open structure, and an insulating partition plate is arranged between the gaps of the open structure and along the axial direction thereof.

3. The rivet annealing special induction heating coil according to claim 1, characterized in that, The induction heating hole is a circular hole matched with the shape of the rivet.

4. The rivet annealing special induction heating coil according to claim 1, characterized in that, Further comprising a shape maintaining device, a supporting device and a position adjusting device, wherein the supporting device is used for supporting and fixing the induction coil; the shape maintaining device is used for preventing the coil body from deforming; and the position adjusting device is used for adjusting the heating height of the rivet.

5. The rivet annealing special induction heating coil according to claim 4, characterized in that, The shape maintaining device comprises a shape maintaining seat and a shape maintaining pressing plate, wherein the coil body is embedded in the shape maintaining seat, the shape maintaining pressing plate is pressed on the shape maintaining seat and the coil body, and at least one through hole corresponding to the induction heating hole is formed on the shape maintaining seat.

6. The rivet annealing special induction heating coil according to claim 5, characterized in that A rivet positioning member is further arranged in each through hole, and the rivet positioning member is fixed on the shape maintaining seat and used for positioning the rivet.

7. The rivet annealing special induction heating coil according to claim 6, characterized in that The supporting device comprises a front supporting member, a rear supporting member, a bottom plate and a side plate, the front supporting member is supported on the bottom of the coil base, the rear supporting member is supported on the bottom of the shape maintaining pressing plate, the bottom plate is supported on the bottom of the front supporting member and the rear supporting member, and the side plate is fixed on the left and right sides of the device.

8. The rivet annealing special induction heating coil according to claim 7, characterized in that The position adjusting device comprises a position adjusting seat, a rivet bottom support, a bottom support cover plate, a guide column, a spring and an adjusting bolt, wherein the position adjusting seat is provided with the rivet bottom support corresponding to the position of the induction heating hole on the top, the rivet bottom support is fixed by the rivet cover plate, the guide column passes through the bottom plate and is connected to the bottom of the position adjusting seat, the spring is arranged on the guide column, and the adjusting bolt is screw-connected to the bottom plate and passes through the bottom plate and is connected to the bottom of the position adjusting seat.

9. The rivet annealing special induction heating coil according to claim 8, characterized in that The side plate of the supporting device is further locked to the position adjusting seat by a locking screw.

10. The rivet annealing special induction heating coil according to claim 9, characterized in that The position adjusting device further comprises a cooling water pipe and a cooling hole, one end of the cooling water pipe is communicated with the cooling hole arranged in the position adjusting seat, the other end of the cooling water pipe is communicated with a circulating hole in the induction coil, and the other end of the cooling water pipe is communicated with a cooling machine.

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