Locking type thread sleeve and manufacturing method thereof

Abstract

The present application discloses a locking type threaded sleeve and a manufacturing method thereof. The locking type threaded sleeve includes at least one spiral winding, which includes a first bevel, a second bevel, a third bevel and a wedge-shaped edge. The first bevel and the second bevel form a sleeve outer thread for embedding an inner thread on a base. The third bevel and the wedge-shaped edge form a sleeve inner thread. The wedge-shaped edge is configured to have a maximum radial torque of a locking screw after a locking torque is applied to the sleeve inner thread. The locking type threaded sleeve changes the shape of the rhombic wire cross-sectional area, and the shape of one side of the threaded sleeve acts as the direction of the contact force. After the tightening torque of the outer thread of the locking screw is applied, the contact angle of the inner thread acting point and the outer thread reaches the maximum radial torque, so that the radial force torque reaches the maximum after the outer thread of the locking screw reaches the locking torque, thereby achieving the locking and anti-loosening effect.

Description

Technical Field

[0001] This invention relates to a threaded insert, and more particularly to a locking type threaded insert and its manufacturing method. Background Technology

[0002] Wire thread inserts are a new type of internal thread fastener suitable for threaded connections. Also known as threaded inserts or simply inserts, they are spring-shaped concentric bodies with internal and external threads, precisely machined from high-strength, high-precision, and smooth-surfaced cold-rolled diamond-shaped stainless steel wire. They are primarily used to reinforce and protect the internal threads of low-strength materials. When embedded in threaded holes of low-strength engineering materials such as aluminum, magnesium alloys, cast iron, fiberglass, and plastics, wire thread inserts form high-precision internal threads conforming to international standards. They offer high connection strength, vibration resistance, impact resistance, and wear resistance, while also dispersing stress to protect the base thread and significantly extending the service life of the base material.

[0003] The existing threaded inserts have a diamond-shaped cross-section for the threaded coil to form a standard triangular thread profile. In actual use, after the bolt is screwed in, due to machining errors in the thread, the thread near the bolt's contact surface contacts the insert surface, creating pre-tightening. Most of the threads do not contact, remaining in a neutral state. Therefore, the contact friction is low, and the thread is easily loosened under external vibration, which is detrimental to the long-term use of the bolt. Summary of the Invention

[0004] The purpose of this invention is to provide a locking type threaded insert and its manufacturing method, so as to solve the problem that the existing threaded inserts are prone to loosening.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A locking type threaded insert includes at least one helical coil, wherein the helical coil includes a first inclined side, a second inclined side, a third inclined side, and a wedge-shaped edge, the first and second inclined sides forming an external thread for embedding into an internal thread on a base, the third inclined side and the wedge-shaped edge forming an internal thread, the wedge-shaped edge being configured such that the locking screw has a maximum radial torque after a locking screw torque is applied to the internal thread of the insert.

[0007] Furthermore, the locking type threaded sleeve includes at least two helical coils, with the same pitch between adjacent helical coils, and the wedge-shaped edge of each helical coil has the same wedge angle.

[0008] Furthermore, the wedge-shaped edge includes a first wedge and a second wedge, and the angle between the first wedge and the second wedge is 145° to 155°.

[0009] Further, the angle between the first bevel and the second bevel is 55°-58°, and the angle between the first bevel and the third bevel is 118°-122°.

[0010] Further, the angle between the first bevel and the second bevel is 55°-58°, and the angle between the first bevel and the third bevel is 118°-122°.

[0011] Further, the angle between the first bevel and the second bevel is 55°-58°, and the angle between the first bevel and the third bevel is 118°-122°.

[0012] Further, the angle between the first bevel and the second bevel is 55°-58°, and the angle between the first bevel and the third bevel is 118°-122°.

[0013] Further, the angle between the first bevel and the second bevel is 55°-58°, and the angle between the first bevel and the third bevel is 118°-122°.

[0014] A manufacturing method of a locking type threaded sleeve, comprising the following steps:

[0015] 1) rolling the cross section of a circular steel wire into a rhombus by a rolling roller;

[0016] 2) preforming the steel wire rolled in step 1) by a rolling roller, the cross section of the preformed steel wire is a quadrangle, and the two ends of the length direction of the quadrangle have small intervals compared with the rhombus;

[0017] 3) drawing the steel wire preformed in step 2) into a steel wire with a specified cross section by a polycrystal die;

[0018] 4) winding the steel wire formed in step 3) into a threaded sleeve by a forming mandrel.

[0019] The locking type threaded sleeve changes the shape of the cross section of the rhombic wire, and makes the shape of one side of the threaded sleeve as the direction of the contact force, so that the contact angle of the inner thread and the outer thread reaches the maximum radial torque after the tightening torque of the outer thread of the locking screw is applied, thereby the radial torque reaches the maximum after the outer thread of the locking screw reaches the locking torque, so that the locking and anti-loosening effect is achieved. When the structure is used for screw connection, the structure has the elastic abutting effect of the maximum radial torque, so that better locking and anti-loosening effect is achieved, and certain pre-pressing effect is also achieved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the locking type threaded sleeve provided by the embodiment of the present application.

[0021] Figure 2 is Figure 1 is a partial enlarged view of A in FIG. 4;

[0022] Figure 3 is a force analysis diagram of the locking type threaded sleeve provided by the embodiment of the present application. DETAILED DESCRIPTION

[0023] The technical solutions of the present application will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0024] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present application can be more thoroughly and completely understood. It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there can be a middle component. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] Referring to Figures 1 to 3 shown, Figure 1 is a perspective structural schematic diagram of the locking type threaded sleeve provided by the embodiment of the present application; Figure 2 is Figure 1 is a partial enlarged view of A in FIG. 4; Figure 3 is a force analysis diagram of the locking type threaded sleeve provided by the embodiment of the present application.

[0026] Embodiment one

[0027] A locking type thread sleeve includes a plurality of helical turns 1, the helical turns 1 include a first bevel 10, a second bevel 11, a third bevel 12 and a wedge bevel 13, the first bevel 10 and the second bevel 11 form a sleeve external thread for embedding an internal thread on a base body, the third bevel 12 and the wedge bevel 13 form a sleeve internal thread, the wedge bevel 13 is configured to have a maximum radial torque of a locking screw 2 after a locking torque of the locking screw 2 is applied to the sleeve internal thread. The wedge bevel 13 is also configured to have a line contact between the locking screw 2 and the wedge bevel 13 after the locking torque of the locking screw 2 is applied to the sleeve internal thread. The adjacent two helical turns 1 have the same pitch, and the wedge bevel 13 of each helical turn 1 has the same wedge angle.

[0028] The wedge bevel 13 includes a first wedge 130 and a second wedge 131, the first bevel 10 and the second bevel 11 have the same length, the third bevel 12 has a length smaller than that of the second bevel 11, the first wedge 130 has a length greater than that of the second wedge 131, an included angle between the first wedge 130 and the second wedge 131 is 145°, an included angle A between an external thread of the locking screw 2 and the first wedge 130 is 25° after the locking torque of the locking screw 2 is applied to the sleeve internal thread, an included angle between the first bevel 10 and the second bevel 11 is 55°, an included angle between the first bevel 10 and the third bevel 12 is 118°, an included angle between the third bevel 12 and the first wedge 130 is 62°, and an included angle between the second bevel 11 and the second wedge 131 is 86°.

[0029] Embodiment two

[0030] A locking type thread sleeve includes a plurality of helical turns 1, the helical turns 1 include a first bevel 10, a second bevel 11, a third bevel 12 and a wedge bevel 13, the first bevel 10 and the second bevel 11 form a sleeve external thread for embedding an internal thread on a base body, the third bevel 12 and the wedge bevel 13 form a sleeve internal thread, the wedge bevel 13 is configured to have a maximum radial torque of a locking screw 2 after a locking torque of the locking screw 2 is applied to the sleeve internal thread. The wedge bevel 13 is also configured to have a line contact between the locking screw 2 and the wedge bevel 13 after the locking torque of the locking screw 2 is applied to the sleeve internal thread. The adjacent two helical turns 1 have the same pitch, and the wedge bevel 13 of each helical turn 1 has the same wedge angle.

[0031] The wedge edge 13 comprises a first wedge edge 130 and a second wedge edge 131, the first bevel edge 10 and the second bevel edge 11 have the same length, the third bevel edge 12 has a length smaller than that of the second bevel edge 11, the first wedge edge 130 has a length greater than that of the second wedge edge 131, the included angle between the first wedge edge 130 and the second wedge edge 131 is 150°, the included angle A between the external thread of the locking screw 2 and the first wedge edge 130 is 30° after the locking torque of the locking screw 2 is applied to the internal thread of the sleeve, the included angle between the first bevel edge 10 and the second bevel edge 11 is 56°, the included angle between the first bevel edge 10 and the third bevel edge 12 is 120°, the included angle between the third bevel edge 12 and the first wedge edge 130 is 64°, and the included angle between the second bevel edge 11 and the second wedge edge 131 is 88°.

[0032] Embodiment three

[0033] A locking type threaded sleeve comprises a plurality of spiral turns 1, the spiral turns 1 comprise a first bevel edge 10, a second bevel edge 11, a third bevel edge 12 and a wedge edge 13, the first bevel edge 10 and the second bevel edge 11 form the sleeve external thread for embedding the internal thread on the base body, the third bevel edge 12 and the wedge edge 13 form the sleeve internal thread, the wedge edge 13 is configured to have the maximum radial torque of the locking screw 2 after the locking torque of the locking screw 2 is applied to the internal thread of the sleeve. The wedge edge 13 is also configured to have the locking screw 2 locked on the wedge edge 13 and linear contact therebetween after the locking torque of the locking screw 2 is applied to the internal thread of the sleeve. The adjacent two spiral turns 1 have the same pitch, and the wedge edge 13 of each spiral turn 1 has the same wedge angle.

[0034] The wedge edge 13 comprises a first wedge edge 130 and a second wedge edge 131, the first bevel edge 10 and the second bevel edge 11 have the same length, the third bevel edge 12 has a length smaller than that of the second bevel edge 11, the first wedge edge 130 has a length greater than that of the second wedge edge 131, the included angle between the first wedge edge 130 and the second wedge edge 131 is 155°, the included angle A between the external thread of the locking screw 2 and the first wedge edge 130 is 35° after the locking torque of the locking screw 2 is applied to the internal thread of the sleeve, the included angle between the first bevel edge 10 and the second bevel edge 11 is 58°, the included angle between the first bevel edge 10 and the third bevel edge 12 is 122°, the included angle between the third bevel edge 12 and the first wedge edge 130 is 66°, and the included angle between the second bevel edge 11 and the second wedge edge 131 is 90°.

[0035] The manufacturing method of the above-mentioned locking type threaded sleeve comprises the following steps:

[0036] 1) The cross section of the circular steel wire is rolled into a rhombus by a rolling mill;

[0037] 2) The steel wire rolled in step 1) is pre-formed by a rolling mill, the cross section of the pre-formed steel wire is a quadrilateral, and the two ends of the length direction of the quadrilateral have a small gap compared with the rhombus;

[0038] 3) drawing the steel wire preformed in step 2) into a steel wire of a specified section by a polycrystal die;

[0039] 4) winding the steel wire formed in step 3) into a threaded sleeve by a forming mandrel.

[0040] The above examples only illustrate the basic principles and characteristics of the present application, and the present application is not limited to the above examples. Various changes and modifications can be made to the present application without departing from the spirit and scope of the present application, and such changes and modifications fall within the scope of the present application claimed. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A locking-type thread sleeve comprising at least one helical winding, characterized in that, The spiral winding comprises a first bevel, a second bevel, a third bevel and a wedge-shaped edge, the first bevel and the second bevel form a box outer thread for embedding an inner thread on a base, the third bevel and the wedge-shaped edge form a box inner thread, the wedge-shaped edge is configured to have a maximum radial torque of a locking screw after a locking torque of the locking screw is applied to the box inner thread; The wedge-shaped edge comprises a first wedge-shaped edge and a second wedge-shaped edge, and an included angle between the first wedge-shaped edge and the second wedge-shaped edge is 145°-155°; An included angle between an outer thread of the locking screw and the first wedge-shaped edge is 25°-35° after the locking torque of the locking screw is applied to the box inner thread; An included angle between the first bevel and the second bevel is 55°-58°, and an included angle between the first bevel and the third bevel is 118°-122°; An included angle between the third bevel and the first wedge-shaped edge is 62°-66°, and an included angle between the second bevel and the second wedge-shaped edge is 86°-90°; The first bevel and the second bevel have the same length, the third bevel has a length smaller than that of the second bevel, and the first wedge-shaped edge has a length greater than that of the second wedge-shaped edge.

2. A locking-type thread sleeve according to claim 1, wherein The locking thread box comprises at least two spiral windings, adjacent two spiral windings have the same pitch, and the wedge-shaped edge of each spiral winding has the same wedge-shaped angle.

3. The locking-type thread sleeve according to claim 1, wherein The wedge-shaped edge is configured to have a linear contact between the locking screw and the wedge-shaped edge after the locking torque of the locking screw is applied to the box inner thread.

4. A method of manufacturing a locking-type thread sleeve according to any one of claims 1 to 3, characterized by, It comprises the following steps: 1) rolling a cross section of a circular steel wire into a rhombus by a rolling roller; 2) preforming the steel wire rolled in step 1) by a rolling roller, the cross section of the preformed steel wire is a quadrilateral, and compared with the rhombus, the quadrilateral has small spacing at two ends in a length direction; 3) drawing the steel wire preformed in step 2) into a steel wire with a specified cross section by a polycrystal die; 4) winding the steel wire formed in step 3) into a thread box by a forming mandrel. ​

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