Rolling fatigue wear test device and method

Abstract

The invention provides a rolling fatigue wear test device and method.The test device comprises a test container, a driving mechanism and a centering mechanism, the test container is provided with a containing cavity, a test gasket is arranged at the bottom of the containing cavity, and a test piece is placed on the test gasket; the driving mechanism output end is provided with a gland; the centering mechanism comprises at least three balls, and two opposite ends of the balls are respectively embedded in a raceway on the test piece and a matching groove on the gland; the pitch diameter of the raceway is consistent with the pitch diameter of the matching groove, and the centering mechanism is suitable for driving the test piece to horizontally move relative to the test gasket in the running state of the driving mechanism, so that the test piece and the gland are coaxially centered. According to the test device, when the driving mechanism drives the gland to rotate, the ball pushes the test piece to adjust the position, so that the test piece is coaxial with the gland; meanwhile, the test gasket is arranged between the test piece and the test container, so that the test piece cannot be in contact abrasion with the test container when translating, and the service life of the test instrument is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of wear testing, and in particular to a rolling fatigue wear testing device and method. Background Art

[0002] Under complex and harsh working conditions, rolling parts are subjected to high loads, high speeds, long hours, and extreme temperatures at the same time, and fatigue wear is the most common failure mode. Therefore, in order to achieve higher reliability, it is particularly necessary to conduct as many tests as possible on the fatigue life, wear characteristics, and performance of rolling parts metal materials under specific working environments.

[0003] Existing rolling fatigue wear test devices usually use a pressure plate to fix the test piece in the test container, and the alignment of the test piece and the pressure cover usually relies on manual judgment, which may result in the pressure cover and the test piece failing to achieve a sufficiently high coaxial accuracy. For flat test pieces, this situation has little impact; however, if there is a raceway on the surface of the test piece, most of the alignment relies on manual work, and it is difficult for the pressure cover and the test piece to achieve a sufficiently high coaxial accuracy, causing the contact between the steel ball and the raceway of the test piece to not meet the design requirements. Under the same loading conditions, the contact stress of the same steel ball at different positions of the test piece is also not equal, which will make it difficult to control the contact stress between the steel ball and the test piece, seriously affecting the accuracy of the test results.

[0004] Based on this, the inventor of the present application proposes a rolling fatigue wear test device and method in order to solve the above technical problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defect of poor precision of the test piece with a raceway in the prior art when performing a wear test, and to provide a rolling fatigue wear test device and method.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a rolling fatigue wear test device, which is characterized in that it includes:

[0008] The test container has a containing cavity, the bottom of which is provided with a test gasket, and the test piece is placed on the test gasket;

[0009] Drive mechanism, with a gland installed at the output end;

[0010] The centering mechanism comprises at least three balls, the opposite ends of which are respectively embedded in the raceway on the test piece and the matching groove on the gland; wherein,

[0011] When the driving mechanism is in operation, the centering mechanism is suitable for driving the test piece to move horizontally relative to the test gasket so as to coaxially align the test piece and the gland.

[0012] According to one embodiment of the present invention, the test container has a container cover, and the centering mechanism is located in the accommodating cavity;

[0013] One end of the driving mechanism is disposed through the container cover and extends into the accommodating cavity and is connected to the centering mechanism; wherein,

[0014] The driving mechanism and the container cover are rotationally sealed via a sealing ring.

[0015] According to an embodiment of the present invention, one end of the driving mechanism is interference-fitted with the pressure cover by means of a gasket.

[0016] According to an embodiment of the present invention, the container cover is snap-fitted to the test container, and a sealing gasket is provided between the container cover and the test container.

[0017] According to one embodiment of the present invention, the centering mechanism comprises a retaining frame, and the retaining frame is located between the gland and the test piece;

[0018] The balls are installed in holes on the retaining frame and are movably connected to the retaining frame.

[0019] According to one embodiment of the present invention, a plurality of the balls are mounted on the retaining frame;

[0020] The plurality of balls are evenly spaced along the circumference of the retaining frame.

[0021] According to an embodiment of the present invention, the test pad is detachably connected to the test container.

[0022] According to one embodiment of the present invention, the test pad is connected to the test container via a locking assembly;

[0023] The locking assembly comprises at least one threaded connector connected to the test container, each of the threaded connectors is provided with a locking sheet, and one end of the locking sheet is pressed on the top of the test gasket.

[0024] According to an embodiment of the present invention, the locking piece is rotatably connected to the threaded connector.

[0025] The present invention also provides a rolling fatigue wear test method, which is implemented using the rolling fatigue wear test device as described above, and the centering method includes:

[0026] Step 1: Place the test piece on the test pad;

[0027] Step 2, installing a cover plate at one end of the driving mechanism, and placing a centering mechanism between the cover plate and the test piece, and adjusting the balls of the centering mechanism to be respectively embedded in the raceway on the test piece and the matching groove on the pressure cover;

[0028] Step 3: Add the medium that the test piece contacts into the test container, and after installing the container cover, turn on the driving mechanism to automatically align the test piece and the cover plate and perform a wear test.

[0029] The positive and progressive effects of the present invention are:

[0030] In the rolling fatigue wear testing device of the present invention, when the driving mechanism drives the pressure cover to rotate, the test piece is pushed by the ball to adjust the position so that the test piece and the pressure cover are coaxial; at the same time, a test gasket is arranged between the test piece and the test container, so that when the test piece moves horizontally, there will be no contact and wear with the test container, thereby extending the service life of the test instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0032] Figure 1 A cross-sectional view of a rolling fatigue wear test device according to the present invention;

[0033] Figure 2 It is a schematic diagram of the arrangement of the locking components of the rolling fatigue wear test device of the present invention;

[0034] Figure 3 The figure is a flow chart of the dynamic fatigue wear test method of the present invention.

[0035] 1. Test container; 11. Accommodating cavity; 12. Test gasket; 13. Test piece; 131. Raceway; 14. Container cover; 141. Sealing ring; 142. Sealing gasket; 15. Locking assembly; 151. Threaded connector; 152. Locking piece;

[0036] 2. driving mechanism; 21. gland; 211. matching groove; 22. gasket;

[0037] 3. Centering mechanism; 31. Ball; 32. Cage. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0040] Please refer to Figure 1 and Figure 2 The present invention proposes a rolling fatigue wear test device, including a test container 1, a driving mechanism 2 and a centering mechanism 3. The test container 1 has a containing cavity 11. A test gasket 12 is provided at the bottom of the containing cavity 11, and a test piece 13 is placed on the test gasket 12. A pressure cover 21 is installed at the output end of the driving mechanism 2. The centering mechanism 3 includes at least three balls 31. The opposite ends of the balls 31 are respectively embedded in a raceway 131 on the test piece 13 and a matching groove 211 on the pressure cover 21. Among them, when the driving mechanism 2 is in operation, the centering mechanism 3 is suitable for driving the test piece 13 to move horizontally relative to the test gasket 12, so as to coaxially align the test piece 13 and the pressure cover 21.

[0041] A centering mechanism 3 is arranged between the pressure cover 21 and the test piece 13. When the driving mechanism 2 is in the driving state, the ball 31 rolls in the raceway 131 of the test piece 13 and the matching groove 211 of the pressure cover 21. Under the pushing action of the ball 31, the test piece 13 is automatically coaxial with the pressure cover 21, thereby ensuring that the test piece 13 and the pressure cover 21 achieve a higher coaxiality, avoiding abnormal contact of the test piece 13 caused by eccentricity that affects the accuracy of the test result, thereby reducing the time for centering the test piece 13 and the pressure cover 21, reducing the workload of the test personnel, and reducing the difficulty of installing and debugging the test piece 13 before the test.

[0042] Specifically, the test container 1 has a container cover 14, and the centering mechanism 3 is located in the accommodating cavity 11; one end of the driving mechanism 2 is passed through the container cover 14 and extends into the accommodating cavity 11 and is connected to the centering mechanism 3; wherein the driving mechanism 2 and the container cover 14 are rotationally sealed by a sealing ring 141.

[0043] The test container 1 has a containing chamber 11 , in which a medium in contact with the test piece 13 , such as lubricating oil, lubricating grease or water, can be stored.

[0044] The container cover 14 is used to prevent the medium in the accommodating chamber 11 from splashing when the driving mechanism 2 is in operation, and can also prevent external impurities from entering the accommodating chamber 11 and affecting the test.

[0045] Specifically, a mounting hole cooperating with the driving mechanism 2 is opened in the middle of the container cover 14, and a sealing ring 141 is arranged on the periphery of the mounting hole. One end of the driving mechanism 2 is passed through the mounting hole and is interference fit with the container cover 14 through the sealing ring 141 and rotated to seal, thereby ensuring the sealing of the accommodating cavity 11.

[0046] Furthermore, one end of the driving mechanism 2 is interference-fitted with the pressure cover 21 by means of a gasket 22 .

[0047] That is, in order to improve the connection stability and operation synchronization between the driving mechanism 2 and the gland 21, a gasket 22 is provided on the outer peripheral side of the driving mechanism 2 and closely matches the gland 21. The gasket can be made of rubber or other feasible materials, which are not limited here.

[0048] The outer circumference of the container cover 14 and the test container 1 can be connected by snapping, and a sealing gasket 142 is provided between the container cover 14 and the test container 1 .

[0049] The sealing gasket 142 can ensure the sealing of the connection between the periphery of the container cover 14 and the test container 1. The clamping method can be specifically that a hole is provided at one end of the container cover 14, and a clamping column matching the hole is provided at the top of the test container 1. The container cover 14 is connected to the test container 1 by inserting the clamping column into the hole.

[0050] In some other embodiments, the container cover 14 and the test container 1 may also be connected by bonding or threaded connection, such as bolts, screws, etc. The specific connection method between the container cover 14 and the test container 1 is not limited herein.

[0051] In one embodiment, the centering mechanism 3 includes a retaining frame 32 , and the retaining frame 32 is located between the pressure cover 21 and the test piece 13 ; the ball 31 is installed in a hole on the retaining frame 32 and is movably connected to the retaining frame 32 .

[0052] That is, the retaining frame 32 is used to mount the ball 31 , and the ball 31 is rollingly connected to the retaining frame 32 . The movement of the ball 31 can drive the test piece 13 and the pressure cover 21 to be aligned.

[0053] Optionally, a plurality of balls 31 are mounted on the retaining frame 32 ; the plurality of balls 31 are evenly spaced along the circumference of the retaining frame 32 .

[0054] Optionally, the number of the balls 31 may be three, four or five, which is not limited here.

[0055] The centering steps are as follows: the driving mechanism 2 is first pressed down to form abutment between the pressure cover 21 and the ball 31, and the other end of the ball 31 is abutted and embedded in the raceway 131 of the test piece 13. Then the driving mechanism 2 is operated, the pressure cover 21 rotates, and one end of the ball 31 rotates in the matching groove 211 of the pressure cover 21, and the other end rotates in the raceway 131 of the test piece 13.

[0056] Because the rotation center of the pressure cover 21 is fixed, as the ball 31 rotates, the ball 31 will be driven to move closer to the middle of the raceway 131, and at the same time drive the test piece 13 to a certain displacement in the plane, and the displacement tends to be in the direction coaxial with the pressure cover 21, until the ball 31 rolls in the middle position of the raceway 131 and the matching groove 211 respectively, that is, the middle diameter of the matching groove 211 of the pressure cover 21 is consistent with the middle diameter of the raceway 131 of the test piece 13, thereby achieving the effect of automatic centering.

[0057] In one embodiment, the test pad 12 is detachably connected to the test container 1 .

[0058] In this way, during the test, the test piece 13 will not wear against the test container 1, but will rub against the test gasket 12. When the test piece 13 or the test container 1 needs to be replaced after a certain period of time, only the test gasket 12 needs to be replaced, thereby increasing the service life of the test container 1.

[0059] Specifically, the test gasket 12 is connected to the test container 1 through a locking assembly 15; the locking assembly 15 includes at least one threaded connector 151 connected to the test container 1, each threaded connector 151 is provided with a locking plate 152, and one end of the locking plate 152 is pressed on the top of the test gasket 12.

[0060] For the test gasket 12 , the locking piece 152 can be rotated under the action of the threaded connector 151 so that one end of the locking piece 152 is pressed against the upper end of the test gasket 12 , thereby positioning the test gasket 12 .

[0061] When the test gasket 12 needs to be replaced, the locking piece 152 only needs to be rotated away from the test gasket 12 to remove the test gasket 12 . The installation and removal of the test gasket 12 is very convenient.

[0062] Furthermore, the locking piece 152 is rotatably connected to the threaded connection member 151 .

[0063] One end of the locking piece 152 is provided with an opening and is sleeved on the outside of the threaded connector 151. During installation, the threaded connector 151 is rotated until the locking piece 152 is pressed against the test gasket 12, so that the test gasket 12 can be limited by the locking piece 152.

[0064] Reference Figure 2 As for the number of locking components 15, four are taken as an example for illustration, but the specific number is not limited.

[0065] The rolling fatigue wear test device proposed in the present invention utilizes a pressure cover 21 to apply a load to a steel ball. When the pressure cover 21 rotates, the steel ball pushes the test piece 13 to perform a small translational motion, thereby ensuring that the test piece 13 and the pressure cover 21 are automatically coaxial. This method solves the problem of non-concentricity between the pressure cover 21 and the test piece 13 in the prior art, avoids abnormal contact of the test piece 13 due to non-concentricity that affects the accuracy of the test results, and at the same time reduces the time required for operating to center the test piece 13 and the pressure cover 21, reduces the workload of the test personnel, and reduces the difficulty of installing and adjusting the test piece 13 before the test.

[0066] Furthermore, the present invention uses a test gasket 12 to separate the test piece 13 from the test container 1, ensuring that the test piece 13 will not contact and wear the test container 1 when achieving translational motion, thereby extending the life of the test instrument.

[0067] Reference Figure 3 The present invention also proposes a rolling fatigue wear test method, which is implemented by using the above rolling fatigue wear test device. The centering method includes:

[0068] S1. Place the test piece on the test pad;

[0069] S2. Install a cover plate at one end of the driving mechanism, and place the centering mechanism between the cover plate and the test piece, and adjust the balls of the centering mechanism to be embedded in the raceway on the test piece and the matching groove on the pressure cover;

[0070] S3. Add the medium that the test piece contacts into the test container, and after installing the container cover, turn on the drive mechanism to automatically align the test piece and the cover plate and perform a wear test.

[0071] The present invention adopts a rolling fatigue wear test method. When a driving mechanism drives the pressure cover to rotate, the test piece is pushed by a ball to adjust its position so that the test piece and the pressure cover are coaxial. At the same time, a test gasket is arranged between the test piece and the test container. In this way, when the test piece moves horizontally, there will be no contact and wear with the test container, thereby extending the service life of the test instrument.

[0072] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0073] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0074] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A rolling fatigue wear test device, It is characterized in that include: The test container has a containing cavity, the bottom of which is provided with a test gasket, and the test piece is placed on the test gasket; Drive mechanism, with a gland installed at the output end; The centering mechanism comprises at least three balls, the opposite ends of which are respectively embedded in the raceway on the test piece and the matching groove on the gland; wherein, The median diameter of the raceway is consistent with the median diameter of the matching groove. When the driving mechanism is in operation, the centering mechanism is suitable for driving the test piece to move horizontally relative to the test gasket to coaxially align the test piece and the gland.

2. The rolling fatigue wear testing device according to claim 1, It is characterized in that The test container has a container cover, and the centering mechanism is located in the accommodating cavity; One end of the driving mechanism is disposed through the container cover and extends into the accommodating cavity and is connected to the centering mechanism; wherein, The driving mechanism and the container cover are rotationally sealed via a sealing ring.

3. The rolling fatigue wear testing device according to claim 2, It is characterized in that One end of the driving mechanism is interference-fitted with the gland by means of a gasket.

4. The rolling fatigue wear testing device according to claim 2, It is characterized in that The container cover is clamped with the test container, and a sealing gasket is arranged between the container cover and the test container.

5. The rolling fatigue wear testing device according to claim 1, It is characterized in that The centering mechanism includes a retaining frame, and the retaining frame is located between the gland and the test piece; The balls are installed in holes on the retaining frame and are movably connected to the retaining frame.

6. The rolling fatigue wear testing device according to claim 5, It is characterized in that A plurality of balls are mounted on the retaining frame; The plurality of balls are evenly spaced along the circumference of the retaining frame.

7. The rolling fatigue wear testing device according to claim 1, It is characterized in that The test gasket is detachably connected to the test container.

8. The rolling fatigue wear testing device according to claim 7, It is characterized in that The test gasket is connected to the test container via a locking assembly; The locking assembly comprises at least one threaded connector connected to the test container, each of the threaded connectors is provided with a locking sheet, and one end of the locking sheet is pressed on the top of the test gasket.

9. The rolling fatigue wear testing device according to claim 8, It is characterized in that The locking piece is rotatably connected to the threaded connector.

10. A rolling fatigue wear test method, implemented by using the rolling fatigue wear test device according to any one of claims 1 to 9, It is characterized in that The centering method comprises: Step 1: Place the test piece on the test pad; Step 2, installing a cover plate at one end of the driving mechanism, and placing a centering mechanism between the cover plate and the test piece, and adjusting the balls of the centering mechanism to be respectively embedded in the raceway on the test piece and the matching groove on the pressure cover; Step 3: Add the medium that the test piece contacts into the test container, and after installing the container cover, turn on the driving mechanism to automatically align the test piece and the cover plate and perform a wear test.

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