CN110230638A - A kind of full working scope composite construction sliding axle - Google Patents

Abstract

The invention belongs to the technical field of sliding shafts, and discloses a sliding shaft with a composite structure in all working conditions. The sliding surface of the sliding shaft body is provided with a triple composite texture, and the triple composite texture includes Dimple groups, each dimple group includes the first dimple, the second dimple and the third dimple; the first dimple has the characteristics of small diameter and large depth, which is suitable for low-speed and heavy-load conditions and plays a role in reducing noise and reducing noise. The second dimple has the characteristics of large diameter and shallow depth, which is suitable for high-speed and low-load conditions, making it easier for the sliding shaft to reach the state of dynamic pressure lubrication; the third dimple has the characteristics of moderate diameter and moderate depth, and is suitable for medium-speed, medium-high The load condition is used to transition the sudden change of the working condition to the stable working state in a short period of time. The invention designs reasonable multiple textures on the sliding shaft, thereby improving the comprehensive performance of the sliding friction pair structure, effectively reducing the friction coefficient and wear rate, accelerating the formation of the oil film, and improving the bearing capacity, wear resistance and service life.

Description

A full working condition composite structure sliding shaft

technical field

The invention relates to the technical field of sliding shafts, in particular to a compound sliding shaft under all working conditions.

Background technique

The friction pair structure is an important structural form of rotating machinery, which directly affects the safety and stable operation of the equipment. With the development of various working machinery towards heavy load, precision and high speed, the requirements for the friction pair structure are constantly increasing. Machining regular topography (also known as surface texture) on the surface of the structure is an important technical means to improve the friction and lubrication performance. The traditional friction pair structure is suitable for high-speed, medium-low load conditions, and there are defects such as the friction coefficient increases under high-speed and heavy-load conditions, and the heat generation increases, and the friction pair structure produces thermal deformation, friction pair oil film failure and other defects.

The current technology is to process a single texture on the surface of the friction pair structure to increase the anti-friction performance of the sliding shaft under a certain working condition (high speed and heavy load), but it still remains the same under other working conditions (low speed and heavy load, low speed and medium load, etc.). It is easy to produce friction and wear, cause elastic deformation, reduce the stability of the oil film load, and interfere with the stable operation of the sliding sliding shaft.

Contents of the invention

The invention focuses on solving the technical problems of wear resistance, vibration and noise reduction, and strength of the friction pair structure, and overcomes the fact that the friction pair structure with a single texture only acts on a specific working condition, and the friction under high-speed alternating loads in all working conditions Due to the disadvantages of severe wear, increased heat generation and easy failure of the oil film, reasonable multiple textures are designed on the sliding shaft to improve the comprehensive performance of the sliding friction pair structure, effectively reduce the friction coefficient and wear rate, accelerate the formation of the oil film, and increase the bearing capacity. Ability, wear resistance, and service life, and finally obtain a full-working-condition composite structure sliding shaft with strong wear resistance, low friction coefficient, good noise reduction and vibration reduction performance, and high load-carrying capacity.

In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

A sliding shaft with composite structure under all working conditions, comprising a sliding shaft body, a triple composite texture is arranged on the sliding surface of the sliding shaft body, and the triple composite texture includes groups of dimples, each of which includes a first dimple, a second dimple, and a third dimple;

The maximum axial dimension of the first pit is 1-50 microns, and the maximum radial dimension is 2-5 microns; the maximum axial dimension of the second pit is 50-100 microns, and the maximum radial dimension is 5 microns. -30 microns; the maximum axial dimension of the third pit is 100-500 microns, and the maximum radial dimension is 0.2-2 microns in depth.

Further, the proportion of the first pit, the second pit and the third pit on the sliding surface of the sliding shaft body is in the range of 1-30%.

Further, the first dimples, the second dimples and the third dimples in each dimple group are sequentially arranged along a straight line at equal intervals in the axial direction.

Further, the first pits, the second pits and the third pits in each pit group are arranged according to the positions of the endpoints of a triangle.

Further, the radial sections of the first pit, the second pit and the third pit are any one of rectangle, semicircle, triangle, and inverted trapezoid.

Further, the axial cross-sections of the first pit, the second pit and the third pit are any one of circle, ellipse, semicircle and polygon.

The beneficial effects of the present invention are:

The present invention adopts the triple compound texture to optimize the texture distribution of the surface of the sliding shaft in the friction pair structure, and obtains a full-working-condition composite structure sliding structure with strong wear resistance, low friction coefficient, good noise reduction and vibration reduction performance, and high load-carrying capacity. axis.

The triple composite texture arranged on the surface of the sliding shaft in the present invention takes a dimple group as a basic unit to function, and the dimple group contains three different dimples. The present invention makes the bearing capacity of the surface of the sliding shaft close to that of the sliding shaft on the smooth surface through reasonable texture layout, and the friction performance is better than that of the sliding shaft on the smooth surface; in actual working conditions, the overall sliding shaft is not always under stable working conditions, The load-bearing surface of the sliding shaft is elastically deformed by the non-uniform distribution of force. The shallower dimples in the dimple group with optimized texture arrangement enhance the bearing capacity of the sliding shaft. At the same time, the matching deep-diameter dimples can reduce the friction factor and improve lubrication. performance. The dimple group reduces the maximum oil film pressure and friction of the sliding shaft, increases the minimum oil film thickness, and makes the sliding shaft run more stably. It has been verified by actual experiments that the friction of the smooth and non-textured sliding shaft in the loading experiment under simulated actual working conditions The wear is severe and the friction coefficient is large; the sliding shaft with the triple composite texture quickly enters the super-slip state and the working state is stable in the above experiment under the same conditions.

Description of drawings

Fig. 1 is a schematic structural view of the full working condition composite structure sliding shaft provided by Embodiment 1 of the present invention;

Fig. 2 is the electronic micrograph of the sliding shaft of the composite structure under full working conditions provided by Example 1 of the present invention;

Fig. 3 is a schematic structural view of the sliding shaft of the full working condition composite structure provided by Embodiment 2 of the present invention;

Fig. 4 is the electron micrograph of the sliding shaft of the composite structure under full working conditions provided by Example 1 of the present invention;

Fig. 5 is a time-varying diagram of the friction coefficient of the sliding shaft of the composite structure provided by the present invention;

Figure 6 is a plot of the coefficient of friction versus time for a smooth, untextured sliding shaft.

In the above figure: 1 - sliding shaft body; 100 - sliding surface; 101 - first pit; 102 - second pit; 103 - third pit.

Detailed ways

The present invention will be described in further detail below by specific embodiment:

The following examples can enable those skilled in the art to understand the present invention more comprehensively, but do not limit the present invention in any way.

Example 1:

As shown in Figures 1 and 2, this embodiment provides a sliding shaft with a composite structure under all working conditions, including a sliding shaft body 1, and a triple composite texture is provided on the sliding surface of the sliding shaft body 1, and the triple composite texture includes A plurality of dimple groups are evenly arranged on the sliding surface 100 of the sliding shaft body 1 .

Each dimple group includes a first dimple 101 , a second dimple 102 and a third dimple 103 . The proportion of the first dimple 101 , the second dimple 102 and the third dimple 103 on the sliding surface 100 of the sliding shaft body 1 ranges from 1-30%.

The maximum dimension of each first pit 101 in the axial direction is 1-50 microns, and the maximum dimension in the radial direction is 2-5 microns. The maximum dimension of each second pit 102 in the axial direction is 50-100 microns, and the maximum dimension in the radial direction is 5-30 microns. The maximum dimension of each third pit 103 in the axial direction is 100-500 microns, and the maximum dimension in the radial direction is 0.2-2 microns.

In this embodiment, the first dimples 101, the second dimples 102, and the third dimples 103 in each dimple group are linearly arranged in the axial direction along a straight line with their central points, and the first The dimples 101 and the second dimples 102 and between the second dimples 102 and the third dimples 103 are arranged at equal intervals. The spacing range between the first pit 101, the second pit 102 and the third pit 103 is 1-999 microns; in order to make the structure of the sliding shaft body 1 more reasonable, preferably, the inner pitch of the pit group is 100-500 microns micrometer; further preferably, the internal pitch of the pit group is 150 micrometers. Thus, the surface structure of the sliding shaft body 1 can be made more reasonable. The axial and radial distribution distances between dimple groups and dimple groups need to be set in consideration of actual working conditions.

The shape of the first pit 101, the second pit 102 and the third pit 103 can have multiple options, and its radial section can be rectangular, semicircular, triangular, inverted trapezoidal, etc., and its axial section can be Circles, ellipses, semicircles, polygons, etc.

The first dimple 101 has the characteristics of small diameter and large depth, which is suitable for low-speed and heavy-load working conditions and plays the role of noise reduction and vibration reduction; the second dimple 102 has the characteristics of large diameter and shallow depth, which is suitable for high-speed and low-load working conditions It makes it easier for the sliding shaft to reach the state of dynamic pressure lubrication; the third dimple 103 has the characteristics of moderate diameter and moderate depth, and is suitable for medium-speed, medium-high load conditions and is used to transition to a stable working state when the working conditions change suddenly in a short period of time. In this embodiment, the first dimples 101, the second dimples 102, and the third dimples 103 in the dimple group are arranged linearly in the axial direction in order, and the shallower dimples in the dimple group enhance the bearing capacity of the sliding shaft At the same time, the matching deep diameter dimples can reduce the friction factor and improve the lubrication performance. The moderate dimples stabilize the working state, increase the limit working range of the first two dimples, and strengthen the anti-vibration ability of the shaft. At the same time, the linear arrangement can adjust the maximum oil film Increase the minimum oil film thickness and reduce the influence of elastic deformation on unstable working conditions. As shown in Fig. 5 and Fig. 6, it has been verified by actual experiments that the smooth and non-textured sliding shaft has serious friction and wear in the loading experiment under simulated actual working conditions, and the friction coefficient is relatively large (Fig. 6); The sliding shaft body 1 with composite texture quickly entered the super-slip state and the working state was stable in the above experiment under the same conditions (Fig. 5).

Example 2:

As shown in Figures 3 and 4, this embodiment provides a sliding shaft with a composite structure under all working conditions, including a sliding shaft body 1, a triple composite texture is provided on the sliding surface of the sliding shaft body 1, and the triple composite texture includes A plurality of dimple groups are evenly arranged on the sliding surface 100 of the sliding shaft body 1 .

Each dimple group includes a first dimple 101 , a second dimple 102 and a third dimple 103 . The proportion of the first dimple 101 , the second dimple 102 and the third dimple 103 on the sliding surface 100 of the sliding shaft body 1 ranges from 1-30%.

The maximum dimension of each first pit 101 in the axial direction is 1-50 microns, and the maximum dimension in the radial direction is 2-5 microns. The maximum dimension of each second pit 102 in the axial direction is 50-100 microns, and the maximum dimension in the radial direction is 5-30 microns. The maximum dimension of each third pit 103 in the axial direction is 100-500 microns, and the maximum dimension in the radial direction is 0.2-2 microns.

In this embodiment, the first pits 101, the second pits 102 and the third pits 103 in each pit group are arranged according to the three end points of a triangle with their center points, that is, the first pits 101 It is arranged at equal intervals between the second pits 102 and between the second pits 102 and the third pits 103 . The spacing range between the first pit 101, the second pit 102 and the third pit 103 is 1-999 microns; in order to make the structure of the sliding shaft body 1 more reasonable, preferably, the inner pitch of the pit group is 100-500 microns micrometer; further preferably, the internal pitch of the pit group is 150 micrometers. Thus, the surface structure of the sliding shaft body 1 can be made more reasonable. The axial and radial distribution distances between dimple groups and dimple groups need to be set in consideration of actual working conditions.

The shape of the first pit 101, the second pit 102 and the third pit 103 can have multiple options, and its radial section can be rectangular, semicircular, triangular, inverted trapezoidal, etc., and its axial section can be Circles, ellipses, semicircles, polygons, etc.

The first dimple 101 has the characteristics of small diameter and large depth, which is suitable for low-speed and heavy-load working conditions and plays the role of noise reduction and vibration reduction; the second dimple 102 has the characteristics of large diameter and shallow depth, which is suitable for high-speed and low-load working conditions It makes it easier for the sliding shaft to reach the state of dynamic pressure lubrication; the third dimple 103 has the characteristics of moderate diameter and moderate depth, and is suitable for medium-speed, medium-high load conditions and is used to transition to a stable working state when the working conditions change suddenly in a short period of time. In this embodiment, the first dimple 101, the second dimple 102, and the third dimple 103 in the dimple group are arranged in a triangle, and the shallower dimples in the dimple group enhance the bearing capacity of the sliding shaft. The dimples can reduce the friction factor and improve the lubrication performance. The moderate dimples can stabilize the working state, increase the limit working range of the first two dimples, and strengthen the anti-vibration ability of the shaft. At the same time, the triangular arrangement makes the sliding shaft body 1 appear nonlinear excitation. When the vibration force (oil film force, sealing force, uneven steam pressure) induces system instability or the stability of the eccentric vibration condition is greatly improved, it plays a positive role in reducing vibration, reducing friction factor and stabilizing the working state.

Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art Under the enlightenment of the present invention, without departing from the gist of the invention and the scope of protection of the claims, personnel can also make specific changes in many forms, and these all belong to the protection scope of the present invention.

Claims (6)

1. A sliding shaft with a composite structure in all working conditions, comprising a sliding shaft body, characterized in that a triple composite texture is arranged on the sliding surface of the sliding shaft body, and the triple composite texture includes a structure evenly arranged on the sliding surface. groups of dimples on the sliding surface of the shaft body, each said group of dimples comprising a first dimple, a second dimple and a third dimple; The maximum axial dimension of the first pit is 1-50 microns, and the maximum radial dimension is 2-5 microns; the maximum axial dimension of the second pit is 50-100 microns, and the maximum radial dimension is 5 microns. -30 microns; the maximum axial dimension of the third pit is 100-500 microns, and the maximum radial dimension is 0.2-2 microns in depth. 2. A sliding shaft with an all-working-condition composite structure according to claim 1, wherein the first dimple, the second dimple and the third dimple are located on the body of the sliding shaft. The proportion of the sliding surface ranges from 1-30%. 3. A sliding shaft with an all-working-condition composite structure according to claim 1, wherein the first dimple, the second dimple and the third dimple in each dimple group The pits are sequentially arranged along a straight line at equal intervals in the axial direction. 4. A sliding shaft with a composite structure under all working conditions according to claim 1, wherein the first dimple, the second dimple and the third dimple in each dimple group The dimples are arranged according to the position of the triangle endpoints. 5. A sliding shaft with a composite structure under all working conditions according to claim 1, wherein the radial cross-sections of the first pit, the second pit and the third pit are rectangular, Any one of semicircle, triangle and inverted trapezoid. 6. The sliding shaft with composite structure under all working conditions according to claim 1, characterized in that the axial cross-sections of the first dimple, the second dimple and the third dimple are circular , ellipse, semicircle, polygon in any one.