Dynamic shaft self-locking nut and processing method thereof

Abstract

The application discloses a dynamic shaft self-locking nut, which comprises a screwing part and a locking part connected with each other, and a bevel cut is formed between the screwing part and the locking part; when the dynamic shaft self-locking nut is screwed and fastened with a bolt, the locking part is in interference fit with the bolt in a closing direction of the bevel cut to realize self-locking. Compared with a traditional self-locking nut, the dynamic shaft self-locking nut does not need to be provided with an elastic member, and the self-locking effect can be effectively improved. The application further discloses a processing method of the dynamic shaft self-locking nut, which comprises the following steps: S100, selecting a nut blank with a proper length and completing basic processing; S200, calculating an interference amount e of the dynamic shaft self-locking nut and the bolt; S300, according to the interference amount e and proper bevel cut quantity, the depth and the included angle of the required bevel cut are obtained; and S400, cutting the nut blank to obtain the required dynamic shaft self-locking nut. Through the above method, the processing of the nut blank can be simply and accurately realized, and the dynamic shaft self-locking nut meeting the requirements can be obtained.

Description

A dynamic shaft self-locking nut and its machining method Technical Field

[0001] This application relates to the field of fastener technology, and in particular to a dynamic shaft self-locking nut. Background Technology

[0002] Nuts are commonly used fasteners. To improve the connection stability of nuts and prevent them from loosening or shifting and causing connection failure, various nuts with self-locking functions have been developed on the market. These nuts usually achieve the self-locking function by compressing the elastic element. When installing and tightening the nut, the elastic element is compressed, and the deformation of the elastic element compresses the bolts on the inner side, thereby achieving the purpose of locking and preventing slippage.

[0003] However, the elastic element on this type of nut will develop deformation defects after repeated compression, affecting the tightening or loosening of the nut and resulting in a shorter service life. To extend the service life of the nut, the performance of the elastic element needs to be improved, which usually places higher requirements on the material and manufacturing process of the elastic element, leading to an increase in the manufacturing cost of the nut. Summary of the Invention

[0004] One of the objectives of this application is to provide a nut with a simple structure and good self-locking effect.

[0005] Another object of this application is to provide a method for processing the above-mentioned self-locking nut.

[0006] To achieve at least one of the above objectives, the technical solution adopted in this application is as follows: a dynamic shaft self-locking nut, comprising an engaging portion and a locking portion connected to each other; a bevel is formed between the engaging portion and the locking portion; when the dynamic shaft self-locking nut is engaged and tightened with a bolt, the locking portion is adapted to swing around the connection position in the direction of closing the bevel under the compression of the bolt, so that the locking portion exerts radial compression on the bolt, thereby the locking portion and the bolt undergo an interference fit to achieve self-locking.

[0007] Preferably, the center of the dynamic shaft self-locking nut is provided with a through threaded hole along the axial direction; when the dynamic shaft self-locking nut is screwed and tightened with the bolt, the threaded section at the center of the locking part is adapted to make an axial and radial interference fit with the threaded section of the bolt.

[0008] Preferably, the center of the dynamic shaft self-locking nut is provided with a connected threaded hole and a through hole along the axial direction. The threaded hole is located in the engagement part, and the center of the locking part is the through hole. When the dynamic shaft self-locking nut is screwed and tightened with the bolt, the locking part is adapted to make a radial interference fit with the optical axis section of the bolt through the side of the through hole.

[0009] Preferably, the included angle of the oblique cut is α; then the included angle α takes the value of 10°-45°.

[0010] Preferably, the end faces of the engaging portion and the locking portion that are close to each other are a first extending surface and a second extending surface, respectively, and the second extending surface is perpendicular to the axis of the dynamic shaft self-locking nut; the first extending surface is inclined to the second extending surface so that the oblique cut is formed between the first extending surface and the second extending surface.

[0011] Preferably, the end face of the locking part away from the screw-in part is a wedge surface, and the angle between the wedge surface and the second extension surface is β; the angle β is greater than or equal to the angle α, and the inclination direction of the wedge surface is opposite to that of the first extension surface, so that when the dynamic shaft self-locking nut and the bolt are screwed and tightened, the locking part is adapted to swing in the direction of closing the oblique cut under the compression of the bolt until the oblique cut is completely closed.

[0012] Preferably, the angle β between the wedge surface and the second extension surface is equal to the angle α, and the axial projections of the wedge surface and the first extension surface coincide; thus, when the dynamic shaft self-locking nut and the bolt are screwed together and tightened, the wedge surface is parallel to the radial plane of the dynamic shaft self-locking nut.

[0013] Preferably, let the depth of the oblique cut be X, the outer diameter of the dynamic shaft self-locking nut be D, and the diameter of the threaded hole be d; then the value of X is (Dd) / 2 < X < (D+d) / 2.

[0014] Preferably, the engaging part and the locking part are connected through the middle of the radial plane, so that the oblique cut is formed on both sides of the connection position between the engaging part and the locking part; then the depth X of the oblique cut is (Dd) / 2<X≤0.4D.

[0015] A method for machining a dynamic shaft self-locking nut includes the following machining steps:

[0016] S100: Select a nut blank of appropriate length and complete the machining of the external hexagonal sidewall and threaded hole according to the usage requirements;

[0017] S200: Based on the self-locking strength requirements, the interference e of the dynamic shaft self-locking nut and bolt is calculated;

[0018] S300: Based on the interference e and by selecting an appropriate number of bevel cuts, the required depth and angle of the bevel cuts are obtained;

[0019] S400: Based on the parameters of the oblique cut obtained in step S300 and selecting a suitable wedge angle, the nut blank is cut off to obtain the required dynamic shaft self-locking nut.

[0020] Compared with the prior art, the beneficial effects of this application are as follows:

[0021] (1) When the dynamic shaft self-locking nut and bolt of this application are tightened together, the locking part swings along the closing direction of the oblique cut to create an interference fit between the locking part and the bolt, thereby generating a radial locking torque to ensure self-locking between the dynamic shaft self-locking nut and the bolt. Compared with traditional self-locking nuts, there is no need to set up elastic elements, which simplifies the structure of the dynamic shaft self-locking nut of this application.

[0022] (2) The self-locking strength of the dynamic shaft self-locking nut and bolt can be used to deduce the machining parameters of the bevel cut, and then the required dynamic shaft self-locking nut can be directly machined from the nut blank according to the obtained machining parameters. The whole machining process is simple and convenient to operate. Attached Figure Description

[0023] Figure 1 is a schematic diagram of one embodiment of the present invention.

[0024] Figure 2 is a schematic diagram of the state when the embodiment shown in Figure 1 of the present invention is compacted.

[0025] Figure 3 is a schematic diagram of another embodiment of the present invention.

[0026] Figure 4 is a schematic diagram of the state when the embodiment shown in Figure 3 of the present invention is compacted.

[0027] Figure 5 is a structural schematic diagram of another embodiment of the present invention.

[0028] Figure 6 is a schematic diagram of the state when the embodiment shown in Figure 5 of the present invention is compacted.

[0029] Figure 7 is a schematic diagram of the state of processing according to the embodiments shown in Figures 1 to 4 of the present invention.

[0030] Figure 8 is a schematic diagram of the state of processing according to the embodiments shown in Figures 5 and 6.

[0031] In the figure: oblique cut 100, first extension surface 101, second extension surface 102, screw-in part 110, locking part 120, wedge surface 121, threaded hole 130, through hole 140, nut blank 200, first oblique cut block 201, second oblique cut block 202. Detailed Implementation

[0032] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0033] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0034] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0035] One aspect of this application provides a dynamic shaft self-locking nut, as shown in Figures 1 to 6; one preferred embodiment includes an engaging portion 110 and a locking portion 120 connected to each other. The engaging portion 110 and the locking portion 120 are partially connected such that a bevel 100 is formed between them. During the tightening process of the dynamic shaft self-locking nut and the bolt, the locking portion 120 can continuously compress and engage with the bolt, thereby allowing the locking portion 120 to swing around its connection position with the engaging portion 110 towards the closing direction of the bevel 100 under the pressure of the bolt, so that the locking portion 120 radially compresses the bolt; at this time, the mating hole at the center of the locking portion 120 is offset, thereby allowing an interference fit with the bolt for self-locking.

[0036] Understandably, in traditional nut and bolt connections, the fit between the nut and bolt is typically intermittent. However, in this application, the locking part 120 shifts during engagement with the bolt, causing the axis of the mating hole at the center of the locking part 120 to deviate from the bolt's axis. Furthermore, during this shift, the end of the mating hole at the center of the locking part 120 near the engagement part 110 moves towards the bolt's axis, changing the fit between the end of the locking part 120 near the engagement part 110 and the bolt from a clearance fit to an interference fit. This creates a radial locking torque on the bolt, ensuring that the locking part 120 and the bolt remain self-locking; that is, the entire dynamic shaft self-locking nut and bolt remain self-locking. Since the shift of the locking part 120 is a plastic deformation, even after the tightening force of the dynamic shaft self-locking nut is lost, the locking part 120 can still maintain its deformation and self-locking with the bolt.

[0037] It is also understandable that when the locking part 120 swings towards the closing direction of the oblique cut 100 under the pressure of the bolt, the self-locking torque can be adjusted by the degree of closure of the oblique cut 100. In simpler terms, the greater the tightening force applied to the bolt, the greater the compressive force generated by the bolt on the locking part 120, and consequently the greater the swing amplitude of the locking part 120, resulting in a larger closure of the oblique cut 100 and thus a larger interference fit. That is, the self-locking torque of the locking part 120 on the bolt is dynamic and can be selected according to actual needs. The interference fit is greatest, i.e., the self-locking torque is greatest, when the oblique cut 100 is fully closed; at the same time, the full closure of the oblique cut 100 can also effectively improve the structural stability of the fastener. Therefore, for ease of understanding, the following content will use the example of the oblique cut 100 being fully closed during the self-locking process for explanation.

[0038] In this application, the structure of the center mating hole of the dynamic shaft self-locking nut can be selected according to the type of bolt, as illustrated below by specific embodiments.

[0039] Example 1: As shown in Figures 3 to 6, when the bolt's shank sidewall is provided with a full-size threaded section, the center of the dynamic shaft self-locking nut is provided with a through threaded hole 130 along the axial direction. Thus, when the dynamic shaft self-locking nut and the bolt are screwed together and tightened, the threaded section at the center of the locking part 120 can have an axial and radial interference fit with the threaded section of the bolt.

[0040] It is understandable that when the locking part 120 swings towards the closing direction of the oblique cut 100 until the oblique cut 100 is fully closed, the end of the threaded section at the center of the locking part 120 near the engagement part 110 is offset not only radially but also axially. This results in the threaded section at the center of the locking part 120 and the threaded section of the bolt having an interference fit in both the radial and axial directions, which can effectively improve the self-locking effect of the bolt.

[0041] Example 2: As shown in Figures 1 and 2, when the bolt's screw sidewall has a threaded section, the center of the dynamic shaft self-locking nut has a connected threaded hole 130 and a through hole 140 along the axial direction; wherein, the threaded hole 130 is completely located within the engagement portion 110, and the center of the locking portion 120 is a smooth through hole 140. When the dynamic shaft self-locking nut and the bolt are screwed together and tightened, the locking portion 120 can achieve at least a radial interference fit with the bolt's smooth shaft section through the side of the through hole 140.

[0042] Understandably, when the locking part 120 swings towards the closing direction of the oblique cut 100 until the oblique cut 100 is fully closed, the end of the through hole 140 at the center of the locking part 120 near the engagement part 110 shifts not only radially but also axially. The radial shift of the end of the through hole 140 can compress the bolt to ensure that the thread clearance between the bolt and the engagement part 110 is eliminated, thereby ensuring thread self-locking between the bolt and the engagement part 110. Since the mating position between the bolt and the locking part 120 is the optical axis section, the axial movement of the end of the through hole 140 can allow relative sliding with the optical axis section of the bolt, also providing a certain degree of self-locking capability to the bolt in the axial direction.

[0043] In this embodiment, as shown in Figures 1 to 6, the end faces of the screw-in portion 110 and the locking portion 120 that are close to each other are the first extension surface 101 and the second extension surface 102, respectively. The first extension surface 101 and the second extension surface 102 cooperate with each other to form a bevel 100.

[0044] It is understandable that if the locking part 120 is to generate a radial torque with the bolt, the locking part 120 needs to swing in the closing direction of the oblique cut 100, and the end of the locking part 120 near the engagement part 110 needs to be offset in the axial direction relative to the initial position.

[0045] In order to meet the self-locking requirement of the locking part 120 for the bolt, the first extension surface 101 and the second extension surface 102 are provided in the following three ways.

[0046] Setting Method 1: As shown in Figures 1 to 6, the second extension surface 102 is perpendicular to the axis of the dynamic shaft self-locking nut, that is, parallel to the radial plane of the dynamic shaft self-locking nut. The first extension surface 101 is inclined towards the second extension surface 102 in the direction of the screw-in portion 110, so that the required oblique cut 100 is formed between the first extension surface 101 and the second extension surface 102.

[0047] Setting method 2: Both the second extension surface 102 and the first extension surface 101 are inclined relative to the radial plane of the dynamic shaft self-locking nut in the direction of the screw-in part 110, so that a bevel 100 is formed between the first extension surface 101 and the second extension surface 102.

[0048] Configuration Method 3: The first extension surface 101 is inclined relative to the radial plane of the dynamic shaft self-locking nut in the direction of the engagement portion 110, and the second extension surface 102 is inclined relative to the radial plane of the dynamic shaft self-locking nut in the direction away from the engagement portion 110, so that the required oblique cut 100 is formed between the first extension surface 101 and the second extension surface 102. Furthermore, the angle between the first extension surface 101 and the radial plane of the dynamic shaft self-locking nut needs to be greater than the angle between the second extension surface 102 and the radial plane of the dynamic shaft self-locking nut.

[0049] In layman's terms, all three of the above-mentioned configurations require the projection length of the first extension surface 101 in the side view direction to be greater than the projection length of the second extension surface 102 in the side view direction, so that when the first extension surface 101 and the second extension surface 102 are in contact with each other, the second extension surface 102 moves closer to the first extension surface 101 in the axial direction to squeeze the bolt, thereby forming the required self-locking radial torque.

[0050] It is understandable that, among the three configuration methods described above, the second extension surface 102 in configuration method one is a reference surface parallel to the radial plane, which facilitates processing. Therefore, in this application, the configuration method of the first extension surface 101 and the second extension surface 102 is preferably the first configuration method described above, and the following content will also take configuration method one as an example.

[0051] In this embodiment, as shown in Figures 1 to 6, the included angle of the oblique cut 100 can be set as α; then the included angle α can be 10°-45°.

[0052] It should be understood that the larger the value of the included angle α, the greater the interference between the locking part 120 and the bolt after the locking part 120 swings, i.e., the greater the self-locking torque generated. However, if the value of the included angle α is too large, it will lead to greater plastic deformation caused by the swing of the locking part 120, which may easily cause the locking part 120 and the screw-on part 110 to break. Therefore, the value of the included angle α should not be too large, and the general range is 10°-45°, with a preferred range of 15°-20°.

[0053] It should also be understood that if the locking part 120 is to be able to swing in the direction of closing the oblique cut 100 when the dynamic shaft self-locking nut of this application is screwed and tightened with the bolt, the end face of the locking part 120 that contacts the bolt needs to have a certain angle with the radial plane to ensure that the bolt can generate a squeezing force that drives the locking part 120 to swing after contacting the end face of the locking part 120.

[0054] Therefore, as shown in Figures 1 to 6, the end face of the locking part 120 away from the screw-in part 110 is a wedge surface 121, and the angle between the wedge surface 121 and the second extension surface 102 is β. The included angle β is greater than or equal to the included angle α, and the inclination direction of the wedge surface 121 is opposite to that of the first extension surface 101, so that when the dynamic shaft self-locking nut and the bolt are screwed and tightened, the locking part 120 can swing in the direction of closing the oblique cut 100 under the pressure of the bolt until the oblique cut 100 is completely closed.

[0055] It is understood that the angle between the wedge surface 121 and the second extension surface 102 must be at least equal to the angle between the first extension surface 101 and the second extension surface 102. Thus, during the contact and compression process between the bolt and the locking part 120, the bolt has sufficient axial compression stroke to drive the locking part 120 to swing until the oblique cut 100 closes.

[0056] Of course, if the value of the included angle β is greater than the included angle α, then when the oblique cut 100 is closed, the end face of the locking part 120 and the bolt may be in partial surface contact, which may easily cause the contact area between the bolt and the pressing position of the locking part 120 to be too small, resulting in an unstable pressing structure.

[0057] Therefore, in this embodiment, it is preferable that the angle β between the wedge surface 121 and the second extension surface 102 is equal to the angle α, and that the axial projections of the wedge surface 121 and the first extension surface 101 coincide. Thus, when the dynamic shaft self-locking nut and the bolt are screwed together and tightened, the wedge surface 121 can be parallel to the radial plane of the dynamic shaft self-locking nut, thereby allowing the entire end face of the locking portion 120 to contact the bolt, thereby improving the stability of the locking structure.

[0058] In one embodiment of this application, as shown in Figures 1, 3 and 5, let the radial depth of the oblique cut 100 be X, the circumcircle diameter of the dynamic shaft self-locking nut be D, and the diameter of the threaded hole 130 be d; then the value of X is (Dd) / 2 < X < (D+d) / 2.

[0059] Understandably, if the locking part 120 is to generate a radial self-locking torque on the bolt, the bevel 100 must penetrate at least from the side wall of the dynamic shaft self-locking nut of this application to the central mating hole (threaded hole 130 or through hole 140), i.e., X > (Dd) / 2. At the same time, the depth of the bevel 100 should not be too deep. An excessively deep bevel 100 can easily result in a short connection length between the locking part 120 and the screw-in part 110, making it prone to breakage during the swinging of the locking part 120. Therefore, the depth of the bevel 100 should not penetrate the entire mating hole, i.e., X < (D+d) / 2.

[0060] In this embodiment, the number of oblique cuts 100 can be one or more. For ease of understanding, the following detailed explanation will focus on the number of oblique cuts 100 as one and two.

[0061] When there is only one bevel 100, as shown in Figures 1 to 4, the locking part 120 and the engaging part 110 are connected through a local area located on one side. In this case, to ensure that the locking part 120 can generate sufficient self-locking torque on the bolt after swinging until the bevel 100 closes, the depth X of the bevel 100 can be D / 2 ≤ X < (D+d) / 2. Of course, a corresponding wedge surface 121 is provided on the end face of the locking part 120 away from the engaging part 110.

[0062] When there are two oblique cuts 100, as shown in Figures 5 and 6, the engaging part 110 and the locking part 120 are connected through a local area in the middle of the radial plane, so that oblique cuts 100 are formed on both sides of the connection position between the engaging part 110 and the locking part 120. In this case, to ensure that the locking part 120 can generate sufficient self-locking torque on the bolt after swinging until the oblique cuts 100 close, and to prevent the locking part 120 from breaking after swinging, the depth X of the oblique cut 100 can be (Dd) / 2 < X ≤ 0.4D. Of course, two corresponding wedge surfaces 121 are provided on the end face of the locking part 120 away from the engaging part 110.

[0063] Another aspect of this application provides a method for machining a dynamic shaft self-locking nut, as shown in Figures 7 and 8. A preferred embodiment specifically includes the following machining steps:

[0064] S100: Select a nut blank of appropriate length 200, and complete the machining of the external hexagonal sidewall and threaded hole 130 according to the usage requirements.

[0065] It is understandable that, in order to ensure sufficient threaded connection strength between the dynamic shaft self-locking nut and bolt of this application, the length of the engagement portion 110 needs to be at least equal to the length m1 of a conventional nut; simultaneously, assuming the opening height of the bevel 100 is m2, the lateral projection height of the wedge surface 121 is also at least m2; the lateral projection distance between the bevel 100 and the wedge surface 121 is m3, then the length of the selected nut blank 200 is at least m1 + 2 m2 + m3. The locking portion 120 can replace the washer used in conventional bolt and nut connection structures.

[0066] S200: Based on the self-locking strength requirements, the interference e of the dynamic shaft self-locking nut and bolt is obtained.

[0067] It is understood that the required self-locking force varies depending on the suitable environment for the dynamic shaft self-locking nut of this application. Once the usage environment is determined, the interference e of the dynamic shaft self-locking nut and bolt can be obtained from the value of the required self-locking force. The specific relationship between the value of the interference e and the value of the self-locking force is common knowledge to those skilled in the art, and therefore will not be described in detail here.

[0068] S300: Based on the determined interference e and the selected number of oblique cuts 100, the depth and included angle of the required oblique cuts 100 are obtained.

[0069] It is understandable that, as shown in Figures 1 to 6, there is a relationship between the interference amount e, the depth X of the oblique cut 100, and the included angle α.

[0070] The specific derivation process is as follows: Let the projection length of the first extension surface 101 in the lateral direction within the mating hole be L, and we can obtain the projection length of the second extension surface 102 in the lateral direction within the mating hole as X-(Dd) / 2; then the difference between the projection lengths of the first extension surface 101 and the second extension surface 102 in the lateral direction within the mating hole is Y=L-[X-(Dd) / 2].

[0071] Then, according to the formula for calculating the cosine of the included angle α:

[0072] cosα = [X - (Dd) / 2] / L.

[0073] cosα = e / Y.

[0074] By rearranging the two formulas above, we can obtain the relationship between the interference amount e, the depth X of the oblique cut 100, and the included angle α. Therefore, given a fixed interference fit e, one can choose an appropriate value for X to calculate the corresponding angle α; or, one can choose an appropriate value for the angle α to calculate the corresponding value for X.

[0075] If there is only one oblique cut 100, the depth of the oblique cut 100 is X, and the corresponding interference is e; if there are two oblique cuts 100, the value of the interference e can be selected as general when performing the formula calculation, so as to obtain the value of the depth X of the oblique cut 100 on one side.

[0076] S400: Based on the parameters of the oblique cut 100 obtained in step S300 and selecting a suitable wedge angle 121, the nut blank 200 is cut off to obtain the required dynamic shaft self-locking nut.

[0077] Specifically, if the number of bevels 100 is one, as shown in Figure 7, a first bevel block 201 can be removed by cutting at the corresponding position at the lower part of the nut blank 200. The outline of the first bevel block 201 corresponds to the size and shape of the bevel 100. At the same time, a second bevel block 202 with a right-angled trapezoidal shape in its lateral projection can be removed by cutting at the bottom of the nut blank 200. The bevel profile of the second bevel block 202 corresponds exactly to the wedge surface 121 of the locking part 120.

[0078] If there are two oblique cuts 100, as shown in Figure 8, two symmetrical first oblique cuts 201 can be removed by cutting on both sides of the corresponding position at the bottom of the nut blank 200. The outline of the first oblique cut 201 corresponds to the size and shape of the oblique cut 100. At the same time, a second oblique cut 202 with a lateral projection shape of an isosceles trapezoid can be removed by cutting at the bottom of the nut blank 200. The two oblique contours of the second oblique cut 202 correspond exactly to the two wedge surfaces 121 of the locking part 120.

[0079] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A method for machining a dynamic shaft self-locking nut, characterized in that: The dynamic shaft self-locking nut includes an engaging part and a locking part connected to each other; a bevel is formed between the engaging part and the locking part; when the dynamic shaft self-locking nut is screwed and tightened with the bolt, the locking part is adapted to swing around the connection position in the direction of closing the bevel under the compression of the bolt, so that the locking part radially compresses the bolt, and thus the locking part and the bolt have an interference fit for self-locking; the center of the dynamic shaft self-locking nut is provided with a through threaded hole along the axial direction; the processing of the dynamic shaft self-locking nut includes the following steps: S100: Select a nut blank of appropriate length and complete the basic processing; S200: Calculate the interference amount e of the dynamic shaft self-locking nut and the bolt according to the self-locking strength requirements; S300: Based on the interference amount e and select an appropriate number of bevels, obtain the required bevel depth X and included angle α; wherein, the relationship between the interference amount e and the bevel depth X and included angle α is: In the formula, D represents the outer circle diameter of the dynamic shaft self-locking nut, and d represents the diameter of the threaded hole; the included angle α is 10°-45°; the depth X of the oblique cut is (Dd) / 2 < X < (D+d) / 2; S400: Based on the oblique cut parameters obtained in step S300 and selecting a suitable wedge angle, the nut blank is machined to obtain the required dynamic shaft self-locking nut.

2. The machining method of the dynamic shaft self-locking nut as described in claim 1, characterized in that: When the dynamic shaft self-locking nut and the bolt are screwed together and tightened, the threaded section at the center of the locking part is adapted to make an axial and radial interference fit with the threaded section of the bolt.

3. The machining method of the dynamic shaft self-locking nut as described in claim 1, characterized in that: The center of the dynamic shaft self-locking nut is provided with a connected threaded hole and a through hole along the axial direction. The threaded hole is located in the engagement part, and the center of the locking part is the through hole. When the dynamic shaft self-locking nut is screwed and tightened with the bolt, the locking part is adapted to make a radial interference fit with the optical axis section of the bolt through the side of the through hole.

4. The machining method of the dynamic shaft self-locking nut as described in claim 1, characterized in that: The end faces of the engagement part and the locking part that are close to each other are the first extension surface and the second extension surface, respectively, and the second extension surface is perpendicular to the axis of the dynamic shaft self-locking nut. The first extension surface is inclined to the second extension surface such that the oblique cut is formed between the first extension surface and the second extension surface.

5. The machining method of the dynamic shaft self-locking nut as described in claim 4, characterized in that: The end face of the locking part away from the screw-in part is a wedge surface, and the angle between the wedge surface and the second extension surface is β; the angle β is greater than or equal to the angle α, and the inclination direction of the wedge surface is opposite to that of the first extension surface, so that when the dynamic shaft self-locking nut and the bolt are screwed and tightened, the locking part is adapted to swing in the direction of the oblique cut closing under the compression of the bolt until the oblique cut is completely closed.

6. The machining method of the dynamic shaft self-locking nut as described in claim 5, characterized in that: The angle between the wedge surface and the second extension surface is β, which is equal to the angle α, and the axial projections of the wedge surface and the first extension surface coincide; thus, when the dynamic shaft self-locking nut and the bolt are screwed together and tightened, the wedge surface is parallel to the radial plane of the dynamic shaft self-locking nut.

7. The machining method of the dynamic shaft self-locking nut as described in claim 1, characterized in that: The number of oblique cuts is two; the engagement part and the locking part are connected through the middle of the radial plane, so that oblique cuts are formed on both sides of the connection position between the engagement part and the locking part; then the depth X of the oblique cut is (Dd) / 2<X≤0.4D.

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