Torsional fatigue testing device and method for 18CrNiMo7-6 gear steel

Abstract

The invention discloses a torsion fatigue testing device for 18CrNiMo7-6 gear steel, which comprises a working table, and a testing unit and a control unit are arranged on the working table; the protective cover is arranged on the upper top of the workbench in a sliding mode, and the protective cover can cover the testing unit; the protective cover comprises a main cover body and an extension cover movably arranged on the main cover body, an inner cavity allowing the extension cover to be embedded is formed in the main cover body, and the extension cover can be embedded into the inner cavity or extend out of the inner cavity to increase the total length of the protective cover; a plurality of through holes are formed in the top section of the main cover body, when the protective cover is in a contracted state, the through holes are all closed, and when the protective cover is in an unfolded state, the through holes are all opened. According to the invention, through the arrangement of the telescopically adjustable protective cover and the through hole, in the test process, the protective cover is unfolded, the through hole is opened, the equipment is prevented from being overheated, the temperature of a test environment can be kept stable through proper ventilation, the influence of temperature change on a test result is avoided, and the accuracy of test data is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of steel torsion testing, and in particular relates to a torsion fatigue testing device and a testing method for 18CrNiMo7-6 gear steel. Background Art

[0002] 18CrNiMo7-6 is an alloy steel, usually used to manufacture gears that require high mechanical properties and good wear resistance. This steel has good hardenability and high fatigue strength, suitable for gears working under heavy load and high speed conditions. For the torsional fatigue test of this steel, a specially designed torsional fatigue test device is generally used to evaluate its torsional fatigue resistance.

[0003] In the prior art, in order to prevent the workpiece from accidentally breaking or injuring the experimenter during the experimental test, a steel torsional fatigue testing device is provided with a protective cover on the outside of the test module for protection. However, the closed design of the protective cover may cause the heat generated by the relevant mechanism during the test to be unable to be effectively dissipated, especially during long-term or high-intensity tests. This may cause the equipment to overheat and affect its performance and lifespan. It may also have an adverse effect on the test results and reduce the accuracy and reliability of the data. Summary of the invention

[0004] The present invention aims at solving the problems in the prior art and proposes the following technical solutions:

[0005] The present invention provides a torsional fatigue testing device for 18CrNiMo7-6 gear steel, comprising:

[0006] A workbench, wherein a test unit and a control unit are arranged on the workbench;

[0007] A protective cover, which is slidably disposed on the top of the workbench and can cover the test unit;

[0008] The protective cover comprises a main cover body and an extension cover movably arranged on the main cover body, the main cover body is provided with an inner cavity for the extension cover to be embedded, and the extension cover can be embedded in the inner cavity or extended out of the inner cavity to increase the total length of the protective cover;

[0009] The top section of the main cover body is provided with a plurality of through holes. When the protective cover is in a retracted state, the through holes are all closed, and when the protective cover is in an expanded state, the through holes are all opened.

[0010] As a preferred embodiment of the above technical solution, the extension cover includes an extension cover 1 and an extension cover 2, and one end of the extension cover 1 away from the main cover body is in a closed state.

[0011] As a preferred embodiment of the above technical solution, a spring block is movably provided at the top of one side of the extension cover close to the main cover body, and the outer layer of the top of the main cover body is respectively provided with a socket one and a socket two for embedding the spring block, the socket one is arranged at both sides of the top of the main cover body, and the socket two is arranged in the middle position of the top of the main cover body.

[0012] As a preferred embodiment of the above technical solution, a receiving groove is provided at the position where the spring block is provided on the extension cover, and the spring block is movably provided in the receiving groove. A spring connected to the spring block is also provided in the receiving groove, and the spring block extends out of the receiving groove in a natural state or enters the receiving groove under the action of an external force to compress the spring.

[0013] As a preferred embodiment of the above technical solution, a baffle is also slidably provided on the top of the main cover body, and the baffle can cover the through hole or open the through hole on the outside of the main cover body.

[0014] As a preferred embodiment of the above technical solution, it also includes a temperature control unit, which is arranged on the inner wall of the main cover body.

[0015] As a preferred embodiment of the above technical solution, the temperature control unit includes a mounting groove opened on the inner wall of the main cover body, a plurality of heating elements are arranged in the mounting groove, and a protective net is also arranged at the open end of the mounting groove.

[0016] The present invention also includes:

[0017] The torsional fatigue testing method of 18CrNiMo7-6 gear steel adopts any one of the above-mentioned 18CrNiMo7-6 gear steel torsional fatigue testing devices, comprising the following steps:

[0018] S1. Install the steel to be tested on the test unit;

[0019] S2, extending the extension cover 1 and the extension cover 2 out of the main cover body, so that the protective cover is in an unfolded state and the through hole is opened;

[0020] S3, sliding the protective cover to the position of the test unit to cover the test unit;

[0021] S4. Start the test unit to perform the test.

[0022] The beneficial effects of the present invention are:

[0023] (1) The present invention provides a retractable and adjustable protective cover and through hole, so that the protective cover has greater flexibility. During the test process, the protective cover is unfolded to open the through hole, so that the heat generated by the relevant components during the test process can be dissipated to prevent the equipment from overheating. Appropriate ventilation can keep the temperature of the test environment stable, avoid the impact of temperature changes on the test results, and ensure the accuracy of the test data.

[0024] The main cover body has a double-layer structure, which can effectively block debris and splashes to ensure the safety of operators; and the inner cavity of the main cover body can play a buffering role when the workpiece accidentally splashes and impacts the main cover body, absorb and disperse energy, reduce the impact on the protective cover, prevent the protective cover from damage or deformation, and enhance its protective effect.

[0025] (2) The present invention provides a retractable and adjustable protective cover and through hole. When not in the testing process, the protective cover is retracted and arranged outside the test unit. On the one hand, the retracted protective cover can reduce the space occupied by the protective cover, making the device more compact when not in use, and convenient for storage and management. This is particularly important in the case of limited laboratory space, and more working area can be freed up for other experiments or equipment;

[0026] On the other hand, the closed through-holes enable the protective cover to form a completely closed environment, effectively preventing external pollutants such as dust, water vapor, and moisture from entering the interior of the test unit, keeping the device clean and dry. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 What is shown is the overall front view schematic diagram of the testing device in the embodiment;

[0028] Figure 2 What is shown is a schematic diagram of the state and structure of the protective cover in the embodiment;

[0029] Figure 3 It shows Figure 2 A schematic diagram of the structure enlargement at point A;

[0030] Figure 4 What is shown is a schematic diagram of the top view of the protective cover in the embodiment;

[0031] Figure 5 What is shown is a schematic diagram of the second state structure of the protective cover in the embodiment;

[0032] Figure 6 The diagram shows the cooperation between the temperature control unit and the main cover body in the embodiment;

[0033] Figure 7 The figure shows a schematic diagram of the installation structure of the elastic block on the extension cover in the embodiment;

[0034] Figure 8 What is shown is a side view schematic diagram of the protective cover and the workbench in the embodiment;

[0035] Figure numerals: 1. test unit; 2. control unit; 10. workbench; 11. slide slot 1; 20. protective cover; 21. main cover body; 22. extension cover 1; 23. extension cover 2; 24. inner cavity; 25. through hole; 30. baffle; 31. slide slot 2; 40. temperature control unit; 41. mounting slot; 42. heating element; 43. protective net; 51. spring block; 52. socket 1; 53. socket 2; 54. receiving slot; 55. spring. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0037] Example

[0038] like Figure 1 As shown, Figure 1 What is shown is the overall front view schematic diagram of the testing device in the embodiment;

[0039] The device comprises: a workbench 10, on which a test unit 1 and a control unit 2 are arranged;

[0040] The protective cover 20 is also included. The protective cover 20 is slidably disposed on the top of the workbench 10 , and the protective cover 20 can cover the test unit 1 .

[0041] The test unit 1 and the control unit 2 are modules in the prior art that can clamp the test steel and perform torsion testing, processing, data output, etc. on the steel;

[0042] The protective cover 20 is n-shaped and made of transparent material, allowing the operator to observe the test process in real time without opening it, ensuring the smooth progress of the test, timely discovering and handling abnormal situations, and having a certain impact resistance, such as polycarbonate;

[0043] The protective cover 20 is slidably set on the workbench 10, and can cover the test unit 1 during the test to prevent the workpiece from accidentally cracking and injuring the experimenter during the torsion experiment; and the protective cover 20 can also cover the test unit 1 when the equipment is not in use, which can effectively prevent external pollutants such as dust, moisture, humidity and corrosive gases from affecting the test unit 1, keep the equipment clean, reduce failures and maintenance requirements caused by pollution, and also prevent external mechanical damage and extend its service life.

[0044] like Figure 8 As shown, Figure 8 What is shown is a side view schematic diagram of the protective cover and the workbench in the embodiment;

[0045] A slide groove 11 extending along the length of the workbench 10 is arranged on the top, and a slide rail is installed in the slide groove 11, and the bottom end of the protective cover 20 is slidably matched with the slide rail.

[0046] The sliding protective cover 20 can be opened and closed quickly, which is convenient for quick operation when installing samples, adjusting parameters or conducting inspections, reducing waiting time. After the test is completed, the sliding protective cover can be opened quickly to facilitate the replacement of samples or cleaning of the test area, thereby improving work efficiency.

[0047] A locking structure may be provided between the protective cover 20 and the workbench 10 so that the position of the protective cover 20 can be fixed.

[0048] like Figure 2 , Figure 5 As shown, Figure 2 What is shown is a schematic diagram of the state and structure of the protective cover in the embodiment; Figure 5 What is shown is a schematic diagram of the second state structure of the protective cover in the embodiment;

[0049] The protective cover 20 includes a main cover body 21 and an extension cover movably arranged on the main cover body 21 . The main cover body 21 is provided with an inner cavity 24 for the extension cover to be embedded. The extension cover can be embedded in the inner cavity 24 or extend out of the inner cavity 24 to increase the total length of the protective cover 20 .

[0050] like Figure 2 As shown, the extension cover extends out of the inner cavity 24 and is in the unfolded state; Figure 5 As shown, the extension covers are all embedded in the inner cavity 24 and are in a retracted state.

[0051] The top section of the main cover body 21 is provided with a plurality of through holes 25. When the protective cover 20 is in the retracted state, the through holes 25 are all closed, and when the protective cover 20 is in the unfolded state, the through holes 25 are all opened.

[0052] Since a cavity is provided on the main cover body 21, the main cover body 21 is divided by the cavity to form a double-layer structure of an inner layer and an outer layer, and the through holes 25 are vertically aligned on the inner layer and the outer layer. A plurality of through holes 25 refers to a plurality of groups aligned up and down.

[0053] When the extension cover is embedded in the inner cavity 24, the extension cover forms a barrier between the inner layer and the outer layer of the through hole 25, so that the through hole 25 cannot be connected to each other up and down, that is, it is in a closed state; on the contrary, the extension cover extends out of the inner cavity 24 and does not play a blocking role, then the through hole 25 is opened.

[0054] The design of the telescopically adjustable protective cover 20 and the through hole 25 makes the protective cover 20 have greater flexibility:

[0055] For example, during the test, the protective cover 20 is unfolded and the through hole 25 is opened, so that the heat generated by the relevant components during the test can be dissipated to prevent the equipment from overheating, and proper ventilation can keep the temperature of the test environment stable, avoid the impact of temperature changes on the test results, and ensure the accuracy of the test data; and the main cover body 21 is a double-layer structure, which can effectively block debris and splashes to ensure the safety of the operator; and the inner cavity 24 of the main cover body 21 can act as a buffer when the workpiece accidentally splashes and impacts the main cover body 21, absorb and disperse energy, reduce the impact on the protective cover 20, prevent the protective cover 20 from being damaged or deformed, and enhance its protective effect.

[0056] In addition, during the non-testing process, the protective cover 20 is retracted and arranged outside the test unit 1. On the one hand, the retracted protective cover 20 can reduce the space it occupies, making the device more compact when not in use, and convenient for storage and management. This is especially important for laboratories with limited space, and more working areas can be freed up for other experiments or equipment. On the other hand, the closed through hole 25 allows the protective cover 20 to form a completely enclosed environment, effectively preventing external pollutants such as dust, water vapor, and moisture from entering the interior of the test unit 1, and keeping the device clean and dry.

[0057] Specifically, the extension cover includes an extension cover 1 22 and an extension cover 23, and one end of the extension cover 1 22 away from the main cover body 21 is in a closed state.

[0058] like Figure 2 , Figure 3 , Figure 5 As shown, Figure 2 What is shown is a schematic diagram of the state and structure of the protective cover in the embodiment; Figure 3 It shows Figure 2 A schematic diagram of the structure enlargement at point A; Figure 5 What is shown is a schematic diagram of the second state structure of the protective cover in the embodiment;

[0059] A spring block 51 is movably provided at the top of one side of the extension cover close to the main cover body 21, and the outer layer of the top of the main cover body 21 is respectively provided with a socket 1 52 and a socket 2 53 for embedding the spring block 51. The socket 1 52 is arranged at both sides of the top of the main cover body 21, and the socket 2 53 is arranged in the middle position of the top of the main cover body 21.

[0060] The spring block 51, the first plug hole 52 and the second plug hole 53 are arranged so that the positions of the retracted and extended states of the protective cover 20 are fixed. When the spring block 51 of the extended cover is inserted into the first plug hole 52, it is in the extended state; when the spring block 51 of the extended cover is inserted into the second plug hole 53 located in the middle position, it is in the retracted state;

[0061] The spring block 51 is retractable, and by applying external force to the extension cover, the extension cover can slide in the inner cavity 24 of the main cover body 21. When the spring block 51 slides to the position of the socket 52, it will extend out and embed into the socket 52. By squeezing the spring block 51 from the outside, the spring block 51 can be contracted and separated from the socket 52, thereby realizing the switching of the position and state of the extension cover.

[0062] like Figure 7 As shown, Figure 7 The figure shows a schematic diagram of the installation structure of the elastic block on the extension cover in the embodiment;

[0063] A receiving groove 54 is provided at the position where the spring block 51 is provided on the extension cover, and the spring block 51 is movably provided in the receiving groove 54. A spring 55 connected to the spring block 51 is also provided in the receiving groove 54. The spring block 51 extends out of the receiving groove 54 in a natural state or enters the receiving groove 54 under the action of external force to compress the spring 55.

[0064] like Figure 4 As shown, Figure 4 What is shown is a schematic diagram of the top view of the protective cover in the embodiment;

[0065] A baffle 30 is also slidably disposed on the top of the main cover body 21, and the baffle 30 can cover the through hole 25 or open the through hole 25 on the outside of the main cover body 21;

[0066] Specifically, a second slide groove 31 is provided on the top of the main cover body 21, and the baffle 30 is slidably installed in the second slide groove 31;

[0067] The provision of the baffle 30 provides the protective cover 20 with further flexibility and controllability, and when the protective cover 20 is in the unfolded state and the through hole 25 is opened, the through hole 25 can also be closed according to specific needs.

[0068] It can adapt to more application scenarios, such as testing the torsion fatigue test of steel at a specific temperature, and can also keep the protective cover 20 in a closed state.

[0069] like Figure 2 , Figure 6 As shown, Figure 2 What is shown is a schematic diagram of the state and structure of the protective cover in the embodiment; Figure 6 The diagram shows the cooperation between the temperature control unit and the main cover body in the embodiment;

[0070] It also includes a temperature control unit 40, which is disposed on the inner wall of the main cover body 21;

[0071] The temperature control unit 40 includes a mounting groove 41 formed on the inner wall of the main housing 21. A plurality of heating elements 42 are disposed in the mounting groove 41. A protective net 43 is also disposed at the open end of the mounting groove 41.

[0072] The temperature control unit 40 can form different temperature environments inside the protective cover 20 to test the torsional fatigue of steel at a specific temperature. The heating element 42 can be heated to increase the temperature inside the protective cover 20, and the protective net 43 protects the heating element 42.

[0073] The present invention also provides a method for testing torsional fatigue of 18CrNiMo7-6 gear steel, which uses the above-mentioned torsional fatigue testing device for 18CrNiMo7-6 gear steel and comprises the following steps:

[0074] S1, install the steel to be tested on the test unit 1;

[0075] S2, extending the extension cover 1 22 and the extension cover 2 23 out of the main cover body 21, so that the protective cover 20 is in an unfolded state and the through hole 25 is opened;

[0076] S3, sliding the protective cover 20 to the position of the test unit 1 to cover the test unit 1;

[0077] S4. Start the test unit 1 to perform the test.

[0078] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. 18CrNiMo7-6 gear steel torsional fatigue testing device, characterized in that: include: A workbench (10), wherein a test unit (1) and a control unit (2) are arranged on the workbench (10); A protective cover (20), wherein the protective cover (20) is slidably disposed on the top of the workbench (10), and the protective cover (20) can cover the test unit (1); The protective cover (20) comprises a main cover body (21) and an extension cover movably arranged on the main cover body (21); the main cover body (21) is provided with an inner cavity (24) for the extension cover to be embedded in; the extension cover can be embedded in the inner cavity (24) or extended out of the inner cavity (24) to increase the total length of the protective cover (20); The top section of the main cover body (21) is provided with a plurality of through holes (25); when the protective cover (20) is in a retracted state, the through holes (25) are all closed; when the protective cover (20) is in an expanded state, the through holes (25) are all opened.

2. The 18CrNiMo7-6 gear steel torsional fatigue testing device according to claim 1 is characterized in that: The extension cover comprises an extension cover 1 (22) and an extension cover 2 (23), and one end of the extension cover 1 (22) away from the main cover body (21) is in a closed state.

3. The 18CrNiMo7-6 gear steel torsional fatigue testing device according to claim 1 is characterized in that: The top of one side of the extension cover close to the main cover body (21) is movably provided with a spring block (51), and the outer layer of the top of the main cover body (21) is respectively provided with a first plug hole (52) and a second plug hole (53) for the spring block (51) to be embedded, the first plug hole (52) is arranged at two sides of the top of the main cover body (21), and the second plug hole (53) is arranged at the middle position of the top of the main cover body (21).

4. The 18CrNiMo7-6 gear steel torsional fatigue testing device according to claim 3 is characterized in that: A receiving groove (54) is provided at a position where the elastic block (51) is provided on the extension cover, the elastic block (51) is movably provided in the receiving groove (54), a spring (55) connected to the elastic block (51) is also provided in the receiving groove (54), and the elastic block (51) extends out of the receiving groove (54) in a natural state or enters the receiving groove (54) by compressing the spring (55) under the action of an external force.

5. The 18CrNiMo7-6 gear steel torsional fatigue testing device according to claim 1 is characterized in that: A baffle (30) is also slidably provided on the top of the main cover body (21), and the baffle (30) can cover the through hole (25) or open the through hole (25) on the outside of the main cover body (21).

6. The 18CrNiMo7-6 gear steel torsional fatigue testing device according to claim 1 is characterized in that: It also includes a temperature control unit (40), which is arranged on the inner side wall of the main cover body (21).

7. The 18CrNiMo7-6 gear steel torsional fatigue testing device according to claim 6 is characterized in that: The temperature control unit (40) comprises a mounting groove (41) provided on the inner side wall of the main cover body (21), a plurality of heating elements (42) being arranged in the mounting groove (41), and a protective net (43) being arranged at the open end of the mounting groove (41).

8. A method for testing torsional fatigue of 18CrNiMo7-6 gear steel, using a testing device for torsional fatigue of 18CrNiMo7-6 gear steel as described in any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Install the steel material to be tested on the test unit (1); S2, extending the extension cover 1 (22) and the extension cover 2 (23) out of the main cover body (21), so that the protective cover (20) is in an unfolded state and the through hole (25) is opened; S3, sliding the protective cover (20) to the position of the test unit (1) to cover the test unit (1); S4. Start the test unit (1) to perform a test.

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