Enhanced thread insert capable of being used for thread repair

Abstract

The utility model provides an enhanced thread insert capable of being used for thread repair, which comprises an insert body, a through hole is vertically arranged in the insert body, and an internal thread and an external thread are respectively arranged on the inner wall of the through hole and the outer circumference of the insert body. The top of the insert body integrally extends upwards to form a neck, the outer diameter of the neck is smaller than that of the insert body, and the inner diameter of the neck is the same as that of the insert body. The head flange integrally and obliquely extends towards the outer side along the neck to form an annular structure; a circle of knurling is arranged on the outer circumference of the head flange, and after installation, the knurling is embedded into the base metal. By means of the inclined head flange and the knurls arranged on the periphery of the head flange, the effects that the outer side of the flange is flush with base metal after installation and rotation is prevented are achieved; and the internal threads and the external threads are utilized, so that the device is suitable for repairing damaged threads on base metal, can be used for reinforcing the threads of light-weight materials such as aluminum alloy, and can be used for repairing damaged steel wire thread bushings, and the adaptability is improved.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, in particular to the technical field of threaded inserts, and specifically relates to an enhanced threaded insert that can be used for thread repair. Background Art

[0002] The threaded bushing flange currently in use is flat with a thin neck, and the neck needs to be deformed during installation while the flange and the plate are flush.

[0003] Since a small neck is required, there are no threads on the inside and outside of the neck. After installation, there is no thread on the upper part of the inner hole, which will directly reduce the strength of the internal thread. At the same time, since there is no thread on the outside of the neck, the number of threads matching the parent material is reduced, which also reduces the strength of the connection. In addition, since the neck of the threaded bushing is small, the overall strength of the threaded bushing product will also be reduced.

[0004] For the parent material, threaded holes and countersunk holes need to be opened on the wood before processing for docking with the threaded bushing, which makes the processing more complicated, with many steps and low efficiency.

[0005] The prior art discloses a threaded fastener assembly and a threaded fastener locking ring. Patent No. CN108591221B discloses a threaded fastener assembly and a threaded fastener locking ring. The threaded fastener assembly includes a threaded fastener and a locking ring. The threaded fastener is provided with a convex-concave anti-rotation structure on its outer wall. The locking ring includes a main body and an anti-rotation protrusion that is beyond the inner wall of the main body and is used to cooperate with the concave part of the convex-concave anti-rotation structure. The main body is provided with an embedded tooth for embedding a connector to cooperate with the connector to prevent rotation. At least one of the anti-rotation protrusion and the concave part is provided with an inclined guide surface that allows the anti-rotation protrusion to rotate out of the concave part when the two rotate relative to each other. The main body has radial elastic deformation performance. The radial elastic deformation performance enables the anti-rotation protrusion to move radially outward from the main body under the action of the inclined guide surface when a torque is applied to the threaded fastener, and rotate out of the corresponding concave part of the convex-concave anti-rotation structure, thereby realizing the rotation of the threaded fastener in the main body. It is simple and convenient to use, but only vertical knurling is disclosed, and the overall structure is different.

[0006] The prior art discloses a sealing thread reinforcement bushing, patent number CN209977041U, which discloses a sealing thread reinforcement bushing, which is in an I-shaped overall shape; it includes a hollow cylindrical head with vertical stripes, a recessed neck and a body, the outer peripheral surface of the body has threads and a dogtail; the recessed neck is equipped with an O-ring, the upper part of the interior is provided with a large cavity, the lower part of the interior is a threaded structure; the bottom of the interior is a closed structure; the body and the dogtail are connected by an oblique entrance chamfer transition. This thread reinforcement bushing can be directly formed by mechanical processing, and then an O-ring is assembled on the recessed neck. After being installed on a metal plate, the internal and external thread structures are used to enhance the threads, and the O-ring is compressed to play a sealing role, but the thickness of the neck and the structure of the neck that does not deform are not disclosed.

[0007] The prior art discloses a new threaded bushing for a diesel engine and an installation method thereof. Patent No. CN111022468A discloses a new threaded bushing for a diesel engine, comprising a cylindrical body with a hollow structure and a flange portion. The flange portion is arranged on the outer periphery of one end of the body. The body is provided with an internal thread structure and an external thread structure, and also comprises a first sealing ring groove, which is arranged on the outer cylindrical surface of the body, and the first sealing ring groove is arranged near one end of the flange portion; it also comprises a stop tooth, which is arranged on the outer periphery of the body, and the stop tooth is located between the first sealing ring groove and the flange portion. The stop tooth, the first sealing ring groove and the external thread structure are sequentially arranged on the outer periphery of the body. Through the above scheme, by setting the first sealing ring groove on the cylindrical surface of the main body, the sealing effect of the sealing ring will not be lost when the threaded bushing becomes loose in time, forming a stable and effective sealing effect, and the threaded bushing is deformed by external force, so that the back-stop tooth is embedded in the oil pan, forming a fixing effect on the threaded bushing. Although a vertical knurling structure is provided, and the vertical knurling can be embedded in the product by external force, the feature of the flange structure being embedded in the product after deformation is disclosed, but only the effect that the flange of the vertical structure can be embedded is disclosed. Summary of the invention

[0008] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an enhanced thread insert that can be used for thread repair, so as to solve the difficulties of the prior art.

[0009] To achieve the above-mentioned and other related purposes, the utility model provides an enhanced thread insert that can be used for thread repair, comprising:

[0010] An insert body 1, wherein a through hole 2 is vertically formed in the insert body 1, and an internal thread 3 and an external thread 4 are respectively formed on the inner wall of the through hole 2 and the outer circumference of the insert body 1;

[0011] A neck 5, the top of the insert body 1 integrally extends upward to form the neck 5, the outer diameter of the neck 5 is smaller than the insert body 1, and the inner diameter is the same as the insert body 1;

[0012] A head flange 6, wherein the head flange 6 extends outward along the neck in an annular structure;

[0013] The knurling 7 is provided on the outer circumference of the head flange 6 , and after installation, the knurling 7 is embedded in the base material 9 .

[0014] Furthermore, the through hole 2 and the insert body 1 are coaxially arranged.

[0015] In the present technical solution, an insert body 1, a neck 5 and a head flange 6 are integrated. Since the head flange 6 is inclined, a structure that can be deformed and matched with the parent material can be realized during installation. In addition, a knurling 7 is provided on the outer circumference of the head flange 6, which can be combined with the knurling 7 to embed into the parent material to achieve an anti-rotation effect, and finally the effect of the outer side of the flange and the parent material being flush after installation is achieved; further, considering the deformation of the head flange 6, the neck 5 at the bottom does not deform during installation, and a thick structure is adopted. The outer side of the neck is only a tool-retracting groove when processing the thread, which can be as small as possible and does not affect the thread processing. The inner side of the neck is an internal thread, and there is no sink inside the conventional insert, thereby increasing the thickness of the neck and also increasing the length of the internal thread 3;

[0016] In addition, internal threads 3 and external threads 4 are respectively provided on the inner wall of the through hole 2 and the outer circumference of the insert body 1, which can reduce the difficulty of processing the matching base material and the screw. It is not only suitable for repairing damaged threads on the base material, but also can be used for lightweight materials such as aluminum alloy for thread reinforcement, and for repairing damaged wire thread sleeves, thereby improving adaptability.

[0017] According to a preferred solution, the diameter of the external thread 4 is greater than the diameter of the internal thread 3 .

[0018] Furthermore, the internal thread 3 extends from the inner wall of the insert body 1 to the inner wall of the neck 5 .

[0019] In the present technical solution, the threaded insert has threads both inside and outside, the internal thread runs through from top to bottom, and the diameter of the external thread is larger than the diameter of the internal thread, so that the strength of the external thread can be greater than the strength of the internal thread. When in use, the connection strength of the insert can be increased by only increasing the length of the internal thread without increasing the total length of the threaded insert.

[0020] According to a preferred embodiment, the angle between the surface of the head flange 6 close to the through hole 2 and the central axis of the insert body 1 is smaller than the angle between the side of the head flange 6 close to the neck 5 and the central axis.

[0021] Furthermore, the thickness of the head flange 6 near the neck 5 and the through hole 2 is smaller than that at the end away from the neck 5 and the through hole 2.

[0022] In the present technical solution, considering that the structure of the insert is that the head flange 6 is deformed, the portion of the flange close to the axis is relatively thinner. In this way, when the head flange 6 with the straight knurling 7 is stuck into the parent material under the action of force, the combined portion is thicker, which can provide better anti-rotation ability and facilitate the deformation of the flange during installation.

[0023] According to a preferred embodiment, the knurling 7 is a straight knurling.

[0024] In the present technical solution, the straight knurling treatment on the head flange 6 can increase the friction between the insert and the base material, improve the anti-loosening ability, form a tighter connection between the two, reduce the risk of loosening, improve the stability of the connection, and avoid the insert from loosening or breaking.

[0025] According to a preferred embodiment, the knurling 7 is arranged perpendicular to the lower surface of the head flange 6 .

[0026] Furthermore, after installation, the knurling 7 is also arranged perpendicular to the base material 9 .

[0027] In the present technical solution, the straight knurling 7 is arranged to be perpendicular to the lower surface of the head flange 6, so that the straight knurling 7 is perpendicular to the base material after the insert and the base material are installed, which can better provide the anti-rotation capability of the insert and ensure that the insert and the base material will not be relatively displaced or rotated after installation.

[0028] According to a preferred embodiment, a tail end 8 is integrally extended from one end of the insert body 1 away from the head flange 6 , and the dog-tail outer diameter of the tail end 8 is smaller than the outer diameter of the insert body 1 .

[0029] Furthermore, a thread is provided on the tail end 8, and the surface of the dogtail portion having a diameter smaller than the minor diameter of the external thread is smooth.

[0030] In the present technical solution, the tail end 8 is formed by reducing the diameter at the end of the insert body 1 to improve the installation efficiency of the insert. During the installation process, since a smooth surface is provided on the dog tail portion of the tail end 8, the parent material can be quickly introduced while avoiding damage to the inner wall, thereby improving the installation efficiency and reducing the production cost.

[0031] According to a preferred embodiment, a threaded hole 10 corresponding to the insert is provided in the base material 9 , and a chamfer 11 is provided at the top of the threaded hole 10 .

[0032] Furthermore, the top of the threaded hole 10 is chamfered at 45°, and the chamfer opening diameter is slightly larger than the major diameter of the thread of the threaded hole 10, such as the major diameter of the external thread + 0.1 mm.

[0033] In this technical solution, during use, according to the installation requirements of the parent material, compared with conventional threaded inserts, there is no need to open countersinks, and the client processing efficiency is higher and easier to control.

[0034] According to a preferred embodiment, the threaded insert is made of stainless steel or steel.

[0035] According to a preferred embodiment, a tin layer is electroplated on the surface of the threaded insert.

[0036] Furthermore, the stainless steel surface can be optionally electroplated with a tin layer to prevent contact corrosion and electrochemical corrosion; the steel surface is usually electroplated with zinc or zinc-nickel alloy in consideration of the anti-corrosion requirements.

[0037] In the present technical solution, stainless steel plus electroplated tin is preferably used as the material and surface treatment of the threaded insert product. The product has high strength and the electroplated tin can reduce the electrochemical corrosion of the insert and the parent material (such as aluminum alloy) when they may come into contact with liquid.

[0038] A thread-enhanced connection structure using an enhanced thread insert capable of being used for thread repair, comprising:

[0039] A base material 9, wherein a threaded hole is formed on the base material 9;

[0040] A threaded insert, which is threadedly installed in the threaded hole so as to become an integral part with the base material 9;

[0041] The bolt 12 connects the base material 9, the threaded insert 1 and another workpiece 13 together through the threaded insert.

[0042] Furthermore, the thickness of the base material 9 can be reduced by more than half compared to the base material 9 using only conventional bolts.

[0043] In this technical solution, after testing, tensile tests on inserts with 12.9 grade threads basically ended with bolt breakage. Therefore, in actual use, customers can reduce the thickness of the parent material without reducing the connection strength, thereby saving costs. If the insert is not used, and threads and bolt connections are directly processed on the parent material, the parent material thickness must be increased by at least 50%.

[0044] The utility model adopts an integrated structure of an insert body, a neck and a head flange, and utilizes an inclined head flange and knurling arranged on the outer circumference of the head flange to achieve the effect of flushing the outer side of the flange with the parent material and preventing rotation after installation; in addition, the use of internal threads and external threads can reduce the difficulty of processing the matching parent material and the screw rod, and is not only suitable for repairing damaged threads on the parent material, but also can be used for lightweight materials such as aluminum alloy for thread reinforcement, and for repairing damaged wire thread sleeves, thereby improving adaptability.

[0045] The best embodiment of the present invention will be described in more detail below in conjunction with the accompanying drawings so that the features and advantages of the present invention can be easily understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The display is a three-dimensional structural schematic diagram of the utility model;

[0047] Figure 2 The display is a front view of the utility model;

[0048] Figure 3 Shown is a cross-sectional view of the present utility model;

[0049] Figure 4 The display is a schematic diagram of the three-dimensional structure of the utility model after being installed with the parent material;

[0050] Figure 5 Shown is the structural diagram of the parent material in the utility model;

[0051] Figure 6 Shown is a schematic diagram of the installation method S1 of the present invention;

[0052] Figure 7 Shown is a schematic diagram of the installation method S2 of the present invention;

[0053] Figure 8 Shown is a schematic diagram of the installation method S3 of the present invention;

[0054] Description of symbols

[0055] 1. Insert body;

[0056] 2. Through hole;

[0057] 3. Internal thread;

[0058] 4. External thread;

[0059] 5. Neck;

[0060] 6. Head flange;

[0061] 7. Knurling;

[0062] 8. Tail end;

[0063] 9. Parent material;

[0064] 10. Threaded hole;

[0065] 11. Chamfering;

[0066] 12. Bolts;

[0067] 13. Workpiece. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the technical solution of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described in conjunction with the drawings of the specific embodiments of the utility model. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0069] Compared with the embodiments shown in the drawings, feasible implementations within the scope of protection of the present invention may have fewer components, other components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0070] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate quantity restrictions. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0071] The utility model proposes an enhanced thread insert that can be used for thread repair, which is used in the thread connection process. The utility model does not limit the type of base material, but the structure of the enhanced thread insert that can be used for thread repair is particularly suitable for the needs of thread inserts, thread reinforcement, thread repair and wire thread sleeve repair.

[0072] In general, the enhanced threaded insert for thread repair proposed in the present invention mainly comprises an insert body 1, a neck 5, a head flange 6, and a knurl 7. Figure 1 , which shows the arrangement relationship of the insert body 1, the neck 5, the head flange 6, and the knurling 7.

[0073] In order to achieve the purpose of thread repair and strengthening the insert, the problem in the background technology that the flange of the currently used threaded bushing is flat and has a thin neck, the neck needs to be deformed during installation, and the flange and the plate are flush; due to the need for a thin neck, there are no threads on the inside and outside of the neck, and the upper part of the inner hole after installation is without threads, which will directly lead to a reduction in the strength of the internal thread; at the same time, since there are no threads on the outside of the neck, the number of threads matching the parent material is reduced, which also reduces the strength of the connection; in addition, since the neck of the threaded bushing is thin, the overall strength of the threaded bushing product will also be reduced; for the parent material, before processing, it is necessary to open a threaded hole and a countersink on the wood for docking with the threaded bushing, which makes the processing more complicated, with many steps and low efficiency. To solve this problem, the technical solution provided in this embodiment adopts an integrated structure of the insert body 1, the neck 5 and the head flange 6. Since the head flange 6 is inclined, it can be deformed and matched with the parent material during installation. In addition, the knurling 7 is provided on the outer circumference of the head flange 6, and the knurling 7 can be embedded in the parent material to achieve the effect of anti-rotation, and finally the effect of the outer side of the flange and the parent material being flush after installation is achieved; further, considering the deformation of the head flange 6, the neck 5 at the bottom does not deform during installation, and a thick structure is adopted. The outer side of the neck is only a tool-retracting groove when processing the thread, which can be as small as possible and does not affect the thread processing. The inner side of the neck is an internal thread, and there is no sink inside the conventional insert, thereby increasing the thickness of the neck and the length of the internal thread 3;

[0074] In addition, internal threads 3 and external threads 4 are respectively provided on the inner wall of the through hole 2 and the outer circumference of the insert body 1, which can reduce the difficulty of processing the matching base material and the screw. It is not only suitable for repairing damaged threads on the base material, but also can be used for lightweight materials such as aluminum alloy for thread reinforcement, and for repairing damaged wire thread sleeves, thereby improving adaptability.

[0075] Specifically, Figure 1 As shown, the top of the insert body 1 integrally extends upward to form a neck 5, the outer diameter of the neck 5 is smaller than the insert body 1, and the inner diameter is the same as the insert body 1, and the head flange 6 integrally extends outward along the neck to form a ring-shaped structure, and a circle of knurling 7 is provided on the outer circumference of the head flange 6. After installation, the knurling 7 is embedded in the base material 9.

[0076] As mentioned above, a through hole 2 is vertically opened in the insert body 1, and an internal thread 3 and an external thread 4 are respectively opened on the inner wall of the through hole 2 and the outer circumference of the insert body 1. The internal thread 3 extends from the inner wall of the insert body 1 to the inner wall of the neck 5. Since the threaded insert has threads both inside and outside, and the internal thread runs through from top to bottom, considering that the thread diameter is proportional to the connection strength, the diameter of the external thread 4 is set larger than the diameter of the internal thread 3, so that the strength of the external thread can be greater than the strength of the internal thread. When in use, the connection strength of the insert can be increased by only increasing the length of the internal thread without increasing the total length of the threaded insert.

[0077] It should be specifically explained that, since the deformation area is on the head flange 6 during installation, that is, the thickness of the head flange 6 near the neck 5 and the through hole 2 is required to be smaller than the end away from it, for this reason, the part of the flange near the axis is relatively thinner in this embodiment, that is, the angle between the surface of the head flange 6 near the through hole 2 and the central axis of the insert body 1 is smaller than the angle between the side of the head flange 6 near the neck 5 and the central axis. In this way, when the head flange 6 with the straight knurling 7 is stuck into the parent material under the action of force, the combined part is thicker, which can provide better anti-rotation ability and facilitate the deformation of the flange during installation.

[0078] On this basis, not only is the knurling 7 arranged perpendicular to the lower surface of the head flange 6, but the knurling 7 after installation is also arranged perpendicular to the base material 9. The straight knurling 7 is arranged perpendicular to the lower surface of the head flange 6, so that the straight knurling 7 is perpendicular to the base material after the insert and the base material are installed, and the anti-rotation ability of the insert can be better provided; further, the straight knurling treatment on the head flange 6 can increase the friction between the insert and the base material, improve the anti-loosening ability, form a tighter connection between the two, reduce the risk of loosening, improve the stability of the connection, and avoid the insert from loosening or breaking.

[0079] Taking into account the rapid matching and installation of the threaded insert and the parent material and reducing the difficulty of installation, the tail end 8 is formed by reducing the diameter at the end of the insert body 1 to improve the installation efficiency of the insert. During the installation process, since a smooth surface is provided on the dog tail part of the tail end 8, it can be quickly introduced into the parent material while avoiding damage to the inner wall, thereby improving installation efficiency and reducing production costs.

[0080] Correspondingly, in this embodiment, since the threaded insert not only provides an internal thread 3 but also provides an external thread 4, the corresponding base material 9 mainly needs to be provided with a threaded hole 10 corresponding to the insert inside, and a chamfer 11 is provided at the top of the threaded hole 10. Specifically, the top of the threaded hole 10 is chamfered at 45°, and the chamfer opening diameter is slightly larger than the major diameter of the thread of the threaded hole 10, such as the major diameter of the external thread + 0.1mm. In use, according to the installation requirements of the base material, compared with conventional threaded inserts, there is no need to open a countersink, and the client processing efficiency is higher and easier to control.

[0081] Preferably, the threaded insert is made of stainless steel or steel. The material and surface treatment of the threaded insert product are preferably stainless steel plus electroplated tin. The stainless steel surface may or may not be electroplated. The product has high strength and electroplated tin can reduce electrochemical corrosion of the insert and the base material (such as aluminum alloy) when they may come into contact with liquid.

[0082] The installation method of the threaded insert provided in this embodiment includes the following steps:

[0083] S1: Figure 6 As shown, the insert is screwed into the bottom hole thread of the parent material until the inclined head flange 6 of the insert head contacts the chamfer 11 of the hole on the parent material;

[0084] At this time, it can be seen from the figure that the part beyond the chamfer of the hole is mainly a circle of straight knurling 7 on the outside of the flange head;

[0085] S2: Figure 7 As shown, by applying pressure to the head flange 6 of the insert, the head flange 6 is pressed into the parent material, which is generally a lightweight material such as aluminum alloy;

[0086] When pressure is applied, the head flange 6 of the insert will deform, and the outer side of the head flange 6 will deform so as to be pressed into the base material. In fact, the part pressed into the base material is mainly a circle of straight knurling 7 on the outer side of the flange, and the part pressed into the base material is flush with the surface of the base material. During the installation process, the neck does not deform.

[0087] S3: Figure 8 As shown, after the insert is installed on the base material, another workpiece can be placed on top, and then the new workpiece, the base material and the insert are connected with bolts. The entire connection is a metal-to-metal connection with high connection strength.

[0088] In addition, this embodiment also provides three usage methods:

[0089] 1. Used to repair the threads on the damaged parent material:

[0090] When the thread on the parent material is damaged, you can drill and process the bottom hole on the parent material as mentioned above, and then install the insert into the parent material. After the repair, the customer can use bolts of the same grade (or even higher strength) and size as the original for connection.

[0091] After testing, it was found that tensile tests on inserts using grade 12.9 threads almost always ended with the bolts breaking.

[0092] 2. Used for lightweight materials such as aluminum alloy for thread reinforcement:

[0093] Drill a bottom hole in the parent material, install it, and then connect it normally using bolts.

[0094] After testing, it was found that tensile tests on inserts with 12.9 grade threads almost always ended with bolt breakage; therefore, the thickness of the parent material can be reduced without reducing the connection strength, thus saving costs;

[0095] If the insert is not used and threads and bolt connections are directly processed on the parent material, the thickness of the parent material must be increased by at least 50%.

[0096] 3. Used to repair damaged Helicoil wire thread sleeves:

[0097] When the wire thread sleeve is damaged, first remove the wire thread sleeve; then drill the hole, process the bottom hole thread and the hole chamfer; screw the threaded insert into the bottom hole thread; apply pressure to the head flange of the threaded insert and press the head flange into the parent material; the installation is completed.

[0098] The customer places another workpiece on top of the flange and bolts the two together.

[0099] After testing, customers can use bolts of the same grade (or even higher strength) and size as the original ones for connection after repair.

[0100] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. An enhanced thread insert for thread repair, characterized in that: include: An insert body (1), wherein a through hole (2) is vertically provided in the insert body (1), and an internal thread (3) and an external thread (4) are respectively provided on the inner wall of the through hole (2) and the outer circumference of the insert body (1); A neck (5), wherein the top of the insert body (1) integrally extends upward to form the neck (5), the outer diameter of the neck (5) being smaller than the insert body (1) and the inner diameter being the same as that of the insert body (1); A head flange (6), the head flange (6) extending integrally along the neck and tilting outward to form an annular structure; A knurling (7) is provided on the outer circumference of the head flange (6) to form a circle of knurling (7). After installation, the knurling (7) is embedded in the base material (9).

2. The enhanced thread insert for thread repair according to claim 1, characterized in that: The diameter of the external thread (4) is greater than the diameter of the internal thread (3).

3. The enhanced thread insert for thread repair according to claim 2, characterized in that: The angle between the surface of the head flange (6) close to the through hole (2) and the central axis of the insert body (1) is smaller than the angle between the side of the head flange (6) close to the neck (5) and the central axis.

4. The enhanced thread insert for thread repair according to claim 3, characterized in that: The knurling (7) is a straight knurling.

5. The enhanced thread insert for thread repair according to claim 4, characterized in that: The knurling (7) is arranged perpendicular to the lower surface of the head flange (6).

6. The enhanced thread insert for thread repair according to claim 5, characterized in that: A tail end (8) is integrally extended from one end of the insert body (1) away from the head flange (6), and the outer diameter of the tail end (8) is smaller than the outer diameter of the insert body (1).

7. The enhanced thread insert for thread repair according to claim 6, characterized in that: The parent material (9) is provided with a threaded hole (10) corresponding to the insert, and the top of the threaded hole (10) is provided with a chamfer (11).

8. The enhanced thread insert for thread repair according to claim 7, characterized in that: The threaded insert is made of stainless steel or steel.

9. The enhanced thread insert for thread repair according to claim 8, characterized in that: The surface of the threaded insert is electroplated with a tin layer.

10. A thread-reinforced connection structure using a reinforced thread insert capable of being used for thread repair, characterized in that: include: A base material (9), wherein a threaded hole is formed in the base material (9); a threaded insert, wherein the threaded insert is threadedly installed in the threaded hole so as to form a whole with the base material (9); and a bolt (12), wherein the bolt (12) connects the base material (9), the threaded insert and another workpiece (13) together through the threaded insert.

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