CN109612864B - Sliding friction fatigue test device for rotary bending fatigue machine - Google Patents
Sliding friction fatigue test device for rotary bending fatigue machine Download PDFInfo
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- CN109612864B CN109612864B CN201811527584.2A CN201811527584A CN109612864B CN 109612864 B CN109612864 B CN 109612864B CN 201811527584 A CN201811527584 A CN 201811527584A CN 109612864 B CN109612864 B CN 109612864B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
- G01N2203/0007—Low frequencies up to 100 Hz
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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Abstract
The invention relates to a sliding friction fatigue test device for a rotary bending fatigue machine, which is fixedly arranged in the rotary bending fatigue machine, a fatigue sample (8) is clamped between a spindle clamp (13) and a loading clamp (14) of the rotary bending fatigue machine, the device comprises a support frame (7), sliding friction force application units and a data acquisition unit, the sliding friction force application units are fixedly arranged on the support frame (7) and are used for applying a normal contact load to the fatigue sample (8), the fatigue sample (8) penetrates through the support frame (7), the sliding friction force application units comprise two groups which are symmetrically arranged on two sides of the fatigue sample (8), and the straight lines of the two groups of sliding friction force application units are vertical to the axial direction of the fatigue sample (8). Compared with the prior art, the invention has the advantages of simple structure, convenient operation, strong adaptability and good test effect, and provides an effective means for researching the coupling action of fatigue load and wear behavior.
Description
Technical Field
The invention relates to the technical field of material testing, in particular to a sliding friction fatigue testing device for a rotary bending fatigue machine.
Background
The friction fatigue study has important significance in the manufacturing industry, in the operation process of a mechanical system, alternating cyclic load is inevitably transmitted under the friction conditions of sliding, rolling, impact and the like, and the wear can reduce the fatigue limit of structural parts and materials, so that serious damage to mechanical components is caused, and great harm is brought. For example, in systems with fixed or loose fitting couplings, crankpins with sliding bearings, propeller shafts, gears, bearings, cams, wheel tracks, and casing blades, the fatigue life of the fitting system is greatly reduced by frictional side effects. The friction fatigue effect can cause the material to be peeled off to form pits, so that noise, abrasion, vibration and temperature rise are generated during operation, and the material can cause failure, and therefore, the friction fatigue performance is an important technical index of the material for the key parts. Most theoretical researches simplify the research objects, and the contact characteristics of parts such as gears, bearings and the like belong to the rolling or sliding operation mode, so the conventional fatigue testing device is generally modified and theoretically analyzed. At present, more theoretical researches on friction fatigue are mostly focused on rolling contact fatigue and fretting fatigue, and few researches on a test device of a sliding friction contact fatigue mode are carried out.
At present, most of the research on the friction fatigue science is based on a composite test, the change rule of performance parameters of the material under the composite action of the friction and the fatigue is intuitively obtained through the test, the coupling analysis of the mechanical angle action mechanism can be carried out according to the initiation and the expansion of cracks, and qualitative and quantitative bases are provided for the operation mechanism in the friction fatigue coupling process. Sliding friction wear and fatigue failure widely exist in various mechanical components, and how to consider and quantitatively analyze the coupling action of friction wear and fatigue and the failure rule and action mechanism of materials is extremely important, so that a great deal of theoretical research is needed to give guidance to engineering practice so as to avoid major accidents and have great practical significance in researching the composite action of friction wear and fatigue.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a sliding friction fatigue testing device for a rotary bending fatigue machine, which has reliable experimental results.
The purpose of the invention can be realized by the following technical scheme: the utility model provides a sliding friction fatigue test device for rotatory bending fatigue machine, the device is fixed to be set up in rotatory bending fatigue machine, and the tired sample centre gripping is between the main shaft anchor clamps and the loading anchor clamps of rotatory bending fatigue machine, the device includes the support frame, fixed sliding friction force application unit and the data acquisition unit that are used for exerting normal contact load for tired sample that sets up on the support frame, tired sample passes the support frame, sliding friction force application unit includes two sets ofly, and the symmetry sets up in the both sides of tired sample, and the straight line that two sets of sliding friction force application units are perpendicular with the axis direction of tired sample.
The both sides of support frame are equipped with the through-hole, just the through-hole leans on the outside to be equipped with the internal thread, slip friction force application unit include loading bolt, spring, gasket, miniature weighing sensor and the contact test block that sets gradually from outside to inside, the loading bolt spiro union is in the through-hole to keep fixed through loading fixation nut, the normal direction contact load is applyed with tired sample butt and to tired sample to the contact test block. The loading bolt is screwed in and generates compression, and the machining diameter of the gasket is slightly larger than that of the miniature weighing sensor, so that the gasket is vertically and stably placed in a smooth hole of the supporting frame and well detects the normal contact force vertically contacting with the fatigue test sample.
The top end of the contact test block is hemispherical and forms point contact with the surface of the fatigue test sample.
The data acquisition unit is a weighing instrument, and the weighing instrument is connected with the miniature weighing sensor.
Before the test is started, the two miniature weighing sensors are symmetrically arranged in the sliding friction force application units at the two sides of the fatigue test sample, and the readings of the two miniature weighing sensors are the same. The device can vertically and symmetrically load a fatigue sample, and the readings of the two miniature weighing sensors are ensured to be the same before testing, so that the two loading bolts are ensured to keep the two loads equal in size and then fixed by the loading fixing nuts.
The bottom of the support frame is connected with the magnetic base through a stud and is fixed through a fixing nut, and the magnetic base is magnetically connected in the rotary bending fatigue machine. The position and the height of support frame can be adjusted to this setting to the position and the height of adjustment sliding friction force application unit (mainly be the contact test block), make tired sample when passing the support frame, the axial just can be perpendicular with the contact test block, and the contact point is located tired sample half high department.
Before a test, the fatigue test sample which is in funnel-shaped rotary bending is subjected to ultrasonic cleaning, the fatigue test sample which is subjected to ultrasonic cleaning is clamped on a main shaft fixture and a loading fixture of a rotary bending fatigue testing machine, the coaxiality is adjusted, a loading weight is hung to apply a bending load, and the fatigue test sample can generate certain deflection under the action of the load.
The micro weighing sensor and the weighing instrument are connected and zeroed, the contact test block, the micro weighing sensor, the gasket and the spring are respectively and symmetrically placed in the through hole of the support frame, and the connecting wire of the micro weighing sensor is led out from the through hole. And symmetrically screwing the two loading bolts into the through holes. The sliding friction force application device is connected with the magnetic base through a stud, the magnetic base is fixed on a workbench of a rotary bending fatigue testing machine, and the height is adjusted to enable the center of the hemisphere at the front end of the contact test block and the center of the fatigue test sample to be at the same height and fixed through a fixing nut. And screwing in the loading bolt, adjusting the size of the contact load according to the weighing instrument, keeping the contact load equal, and fixing by using a loading fixing nut.
And starting the rotary bending fatigue testing machine to enable the fatigue test sample to rotate under the action of the bending fatigue cyclic load, and the fatigue test sample slides relative to the contact test block in the rotating process to form sliding friction and fatigue test conditions.
Compared with the prior art, the beneficial effects of the invention are embodied in the following aspects:
firstly, the testing device and the testing method are developed based on the original rotary bending fatigue machine, have low cost and convenient operation, but can provide a complex mechanical component operation mode, effectively couple fatigue and sliding friction and provide help for the theoretical research of the friction fatigue.
And secondly, different rotation frequencies, cyclic loads, contact loads and different contact test block materials can be selected, and the test range is wide.
Thirdly, the stability of the test is high, and the contact load can still be applied along with the section change of the fatigue test sample in the process of friction and tenon damage.
Fourthly, the sliding friction fatigue test device and the test method have simple and reliable structure and easy implementation, can meet the coupling effect of complex sliding friction and fatigue, and are beneficial to the working condition theoretical research and the material performance analysis in a laboratory.
Drawings
FIG. 1 is a schematic perspective view of a sliding friction fatigue testing device clamped on a rotary bending fatigue testing machine;
FIG. 2 is an exploded view of the sliding friction fatigue testing apparatus;
FIG. 3 is a cross-sectional view of the sliding friction fatigue testing apparatus;
fig. 4 is an enlarged view of the contact block.
The device comprises a loading bolt 1, a loading fixing nut 2, a spring 3, a gasket 4, a miniature weighing sensor 5, a contact test block 6, a support frame 7, a fatigue test sample 8, a stud 9, a fixing nut 10, a magnetic base 11, a weighing instrument 12, a spindle clamp 13 and a loading clamp 14.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
A sliding friction fatigue test device for a rotary bending fatigue machine is structurally shown in figures 1-3 and comprises a support frame 7, a sliding friction force application unit consisting of a loading bolt 1, a loading fixing nut 2, a spring 3, a gasket 4, a micro weighing sensor 5 and a contact test block 6, a weighing instrument 12, a stud 9, a fixing nut 10 and a magnetic base 11, wherein the sliding friction fatigue test device can be placed and fixed on the rotary bending fatigue machine, is kept at the same height with a fatigue sample 8 which is clamped by a rotary bending fatigue machine spindle clamp 13 and a loading clamp 14 and bears a bending fatigue load, and symmetrically applies normal contact load to the fatigue sample 8.
Wherein, the support frame 7 is opened has symmetrical through-hole, and is close to the outside and be the screw hole, is close to the smooth hole that the central part is very low for roughness to friction consumption when reducing the load transfer among the test procedure. The upper part of the support frame 7 is provided with a symmetrical groove to complete the wiring of the miniature weighing sensor 5. The bottom of the support frame is provided with a threaded hole, the support frame is connected with a magnetic base 11 through a stud 9 and is kept fixed through a fixing nut 10, and therefore the support frame is connected with a rotary bending fatigue machine workbench.
The contact test block 6, the micro weighing sensor 5, the gasket 4 and the spring 3 are sequentially arranged in the smooth hole, and are screwed in by the loading bolt 1 to extrude. The front end of the contact test block 6 is hemispherical, as shown in fig. 4, the contact test block and the fatigue test sample 8 form a point contact condition, and the bottom of the contact test block is processed to be smooth and flat and is in parallel contact with the micro weighing sensor 5. The pad 4 is machined to a diameter slightly larger than that of the miniature load cell 5 to keep it vertically stably placed in a smooth hole of the support frame 7 and to well detect a normal contact force with the fatigue specimen 8 in a vertical contact. The sliding friction force application unit can vertically and symmetrically load the fatigue test sample, and the loading bolt 1 is adjusted to keep the two loads equal in size and fixed by the loading fixing nut 2.
The test method of the sliding friction fatigue of the rotary bending fatigue machine comprises the following steps:
before a test, a funnel-shaped rotating bending fatigue sample is subjected to ultrasonic cleaning, the fatigue sample subjected to ultrasonic cleaning is clamped on a main shaft fixture 13 and a loading fixture 14 of a rotating bending fatigue testing machine, the main shaft fixture 13 is assembled with a motor of the rotating bending fatigue testing machine, a counterweight is hung to adjust the coaxiality, a loading weight is hung at the tail end of the loading fixture 14 to apply bending load, and the fatigue sample 8 clamped by a cantilever generates certain deflection under the action of the bending load.
The micro weighing sensor 5 and the weighing instrument 12 are connected and zeroed, two contact test blocks 6, the micro weighing sensor 5, the gasket 4 and the spring 3 are respectively placed in the smooth holes of the support frame 7 symmetrically and vertically to the horizontal plane, and the connecting line of the micro weighing sensor 5 is led out from the groove.
The sliding friction force application device is connected with a magnetic base 11 through a stud 9, the magnetic base 11 is fixed on a workbench of a rotary bending fatigue testing machine, and the height is adjusted to enable the center of the hemisphere at the front end of the contact test block 6 and the center of the fatigue test sample to be at the same height and fixed through a fixing nut 10. And screwing in the loading bolt 1, adjusting the contact load according to the weighing instrument 12, keeping the contact load equal, and fixing by using a loading fixing nut 2.
And starting a rotary bending fatigue testing machine to enable the fatigue test sample to keep rotating at the frequency of 30Hz under the action of the bending fatigue cyclic load, wherein the contact test block 6 and the fatigue test sample 8 generate friction force due to normal contact force and continuous relative sliding, so that the test sample is subjected to the coupling action of the fatigue cyclic load and friction wear to form a sliding friction fatigue test condition, and the fatigue limit reduction action and the operation mechanism of the sliding friction wear on the material are researched.
Claims (5)
1. A sliding friction fatigue test device for a rotary bending fatigue machine is fixedly arranged in the rotary bending fatigue machine, and a fatigue sample (8) is clamped between a spindle clamp (13) and a loading clamp (14) of the rotary bending fatigue machine, and is characterized by comprising a support frame (7), sliding friction force application units and a data acquisition unit, wherein the sliding friction force application units are fixedly arranged on the support frame (7) and used for applying normal contact load to the fatigue sample (8), the fatigue sample (8) penetrates through the support frame (7), the sliding friction force application units comprise two groups which are symmetrically arranged on two sides of the fatigue sample (8), and the straight lines of the two groups of sliding friction force application units are vertical to the axial direction of the fatigue sample (8);
the both sides of support frame (7) are equipped with the through-hole, just the through-hole leans on the outside to be equipped with the internal thread, slip friction force application unit include loading bolt (1), spring (3), gasket (4), miniature weighing sensor (5) and contact test block (6) that set gradually from the extroversion in, loading bolt (1) spiro union is in the through-hole to keep fixed through loading fixation nut (2), contact test block (6) and tired sample (8) butt and exert normal direction contact load to tired sample (8).
2. The sliding friction fatigue test device for the rotary bending fatigue machine according to claim 1, wherein the top end of the contact block (6) is hemispherical and forms point contact with the surface of the fatigue specimen (8).
3. The sliding friction fatigue testing device for the rotating bending fatigue machine according to claim 1, wherein the data acquisition unit is a weighing instrument (12), and the weighing instrument (12) is connected with a miniature weighing sensor (5).
4. A sliding friction fatigue testing device for a rotary bending fatigue machine according to claim 3, characterized in that before the test, the two miniature load cells (5) are in the sliding friction force applying units symmetrically positioned at both sides of the fatigue test sample (8) and have the same reading.
5. The sliding friction fatigue testing device for the rotating bending fatigue machine is characterized in that the bottom of the supporting frame (7) is connected with a magnetic base (11) through a stud (9) and is fixed through a fixing nut (10), and the magnetic base (11) is magnetically connected in the rotating bending fatigue machine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811527584.2A CN109612864B (en) | 2018-12-13 | 2018-12-13 | Sliding friction fatigue test device for rotary bending fatigue machine |
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| CN201811527584.2A CN109612864B (en) | 2018-12-13 | 2018-12-13 | Sliding friction fatigue test device for rotary bending fatigue machine |
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| CN109612864B true CN109612864B (en) | 2021-03-26 |
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| CN111707539B (en) * | 2020-06-22 | 2023-03-21 | 中国人民解放军空军工程大学 | Test fixture for applying compressive stress to plate and application method thereof |
| CN115493951B (en) * | 2021-06-18 | 2024-08-23 | 东北大学 | Multifunctional friction wear fatigue coupling test device |
| CN114018732B (en) * | 2021-11-03 | 2024-04-05 | 北京理工大学 | Rolling fretting fatigue test device and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS51140679A (en) * | 1975-05-29 | 1976-12-03 | Komatsu Ltd | Crack detection device for rotary bending tester |
| SU920454A1 (en) * | 1980-07-16 | 1982-04-15 | Куйбышевское Агрегатное Производственно-Конструкторское Объединение | Device for automatic unloading of fatigue tester rotating specimen |
| CN102103056B (en) * | 2011-03-18 | 2012-07-11 | 西南交通大学 | Proportional test device for rotating bending fatigue of train wheel axle |
| CN105675412A (en) * | 2016-01-14 | 2016-06-15 | 西南交通大学 | Bending fretting fatigue experimental equipment and experimental method |
| CN107796717B (en) * | 2017-11-27 | 2023-04-25 | 中国航空综合技术研究所 | Rotational bending fatigue detection device and rotational bending fatigue test method |
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