CN217484008U - Bending-twisting micro-motion damage test device based on lead screw displacement control - Google Patents
Bending-twisting micro-motion damage test device based on lead screw displacement control Download PDFInfo
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- CN217484008U CN217484008U CN202122938398.1U CN202122938398U CN217484008U CN 217484008 U CN217484008 U CN 217484008U CN 202122938398 U CN202122938398 U CN 202122938398U CN 217484008 U CN217484008 U CN 217484008U
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Abstract
The utility model discloses a turn round fine motion damage test device based on lead screw control displacement. The system comprises a test piece clamping system, a bending load applying system and a torsion load applying system. In a bending load applying system, the closed screw mechanisms are symmetrically arranged, so that the symmetrical cyclic bending fatigue load loading is realized. The bending alternating load and the common normal load are loaded through the symmetrical screw rod mechanisms, the variable can be accurately controlled, the experiment repeatability is good, and therefore quantitative experiments can be carried out. The testing machine has small amplitude and good stability, can directly control the speed, the acceleration, the lead and the stroke of the lead screw by using computer software, and is convenient to operate and easy to control. The tester is convenient to assemble and disassemble, can be matched with other fatigue testers for use, and has wide universality.
Description
Technical Field
The utility model relates to a material strength and tribology performance field especially relate to the fine motion test device of material.
Background
Fretting damage (Fretting damage) is a form of damage that exists in mechanical parts that are mated near-rest. The definition of fretting damage is: under the action of a certain normal load, two surfaces in contact with each other generate relative motion with extremely small amplitude (the relative vibration amplitude is less than 300 mu m), and the damage phenomenon of the contact surfaces is caused. The modes of damage can be classified into fretting fatigue, fretting wear, and fretting corrosion 3 (fretting corrosion phenomena are relatively few and are usually not considered). (1) Fretting fatigue refers to the phenomenon that a contact body bears external alternating fatigue stress to generate different deformations so as to cause a contact interface to generate a micro-amplitude relative motion, so that fatigue cracks are initiated and accelerated to expand early, and a component is failed and damaged early. (2) Fretting wear refers to the fact that fine abrasive dust is generated between contact surfaces due to fretting, the color of the oxidized abrasive dust is different from that of the material of a fretting part, and the fact that the fretting spots exist in a damaged area is an important mark for distinguishing common wear from fretting wear. During the development of fretting damage, fretting wear and fretting fatigue are likely to occur, but their damage rates are different. Fretting damage is also known as "industrial cancer". However, due to the complexity of the problem and the uniqueness of the research facility, less experimental research has been conducted for this purpose.
The main difficulties of the presently reported fretting damage test device are the measurement of the variation in the experiment and the difficulty in accurately carrying out quantitative research. Therefore, the research on the fretting damage test device and the test method which can accurately control variables and have good repeatability has certain guiding function on the design of parts in the related field.
SUMMERY OF THE UTILITY MODEL
According to the problems, a bending micro-motion damage test system based on lead screw displacement control and an experimental method thereof are researched, and three different contact modes of points, lines and surfaces can be realized to meet the requirements of various actual conditions. The magnitude and the frequency of the load can be accurately controlled, the repeatability is good, and quantitative research can be carried out.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides a turn round fine motion damage test device based on lead screw control displacement, test device mainly includes following several systems: the device comprises a test piece clamping system, a bending load applying system and a torsion load applying system.
The specimen clamping system includes: the device comprises a base, a micro-motion bracket, a micro-motion support base, a three-jaw chuck and an upper bracket.
The micro-motion support, the micro-motion support base and the three-jaw chuck are fixed on the base through threaded connection, the upper support is fixed on the micro-motion support through threaded connection, and the micro-motion support is fixed on the micro-motion support base through threaded connection. The lower end of the test piece is fixed through a three-jaw chuck.
The bending load applying system includes: the device comprises a stepping motor, a lead screw, a linear guide rail, a sliding block and a micro-motion pad.
The micro-motion pad is connected to the sliding block through a ball hinge, the sliding block is connected to the linear guide rail, the linear guide rail is fixedly connected to the micro-motion support, the screw rod and the sliding block move through rolling friction transmission, the sliding block can move along the linear guide rail in a micron order, and the stepping motor is connected to the screw rod.
The torsional load applying system includes: the device comprises a stepping motor, a coupler, a torque sensor and an upper clamp.
The stepping motor is fixedly connected to the upper support, the coupler is connected with the motor, the torque sensor is connected with the coupler through magnetic force, and the upper clamp is connected with the coupler through a key and used for clamping a test piece.
The testing device is controlled by a computer control system and comprises: computer, controller, driver.
The computer is connected with the controller, the controller is connected with the driver, and the driver is connected with the stepping motor. The signal transmission process is that the software on the computer generates a signal to enable the controller to drive the driver so as to drive the stepping motor, and finally the controller receives the feedback of the stepping motor and the sensor and transmits data to the computer after data processing.
The scheme also has the following characteristics:
firstly, stainless steel shells are adopted on the lead screw, the sliding block and the linear guide rail to seal the lead screw, the sliding block and the linear guide rail, so that a module which can prevent dust and water is formed.
And two groups of the micro-motion pads, the sliding blocks, the linear guide rails and the screw rods are symmetrically arranged on two sides of the test piece, and the motion of the micro-motion pads is symmetrically transferred by the stepping motor through the ball screw rods, so that the symmetrical cyclic bending fatigue load loading is realized.
Thirdly, the friction pair between the micro-motion pad and the test piece can realize a point contact friction pair, a line contact friction pair and a surface contact friction pair.
The utility model discloses an experimental method as follows, wherein:
in the bending-torsion fretting fatigue test, the lower end of a test piece is fixed through a three-jaw chuck, the upper end of the test piece is connected with an upper clamp, and the test piece can provide torsion alternating stress, is measured by a sensor and is transmitted to a computer controller. The bending alternating stress is that the left micro-motion pad and the right micro-motion pad are pressed at proper positions in the middle of the test piece through the slide block to form a point contact pair, a line contact pair or a surface contact pair. The computer sends an instruction to the controller to control the speed, the lead and the stroke of the lead screw, the lead screw drives the sliding block to move, so that the cyclic loading of the bending load is realized, the magnitude of the bending load can be controlled by adjusting the acceleration of the lead screw, and the bending load is measured by the pressure sensor and is transmitted to the computer controller.
In the fretting wear experiment, the test piece lower extreme is fixed by the three-jaw chuck, and the upper end is free, forms the cantilever beam structure, and the test piece right side micro-gap pad provides the direct test piece that compresses tightly of face contact, and the optional point contact of test piece left side micro-gap pad or line contact. The normal load is controlled by the acceleration of the left screw rod and the rigidity of a spring in the left micro-motion pad, the load is fed back to the controller through the pressure sensor and then received and displayed by the computer, and the micro-amplitude vibration of the test piece in the loading horizontal direction is provided by the right micro-motion pad.
Compared with the prior art, the beneficial effects of the utility model are that:
first, bending alternating load and common normal load loading are realized through a symmetrical screw mechanism, variable can be accurately controlled, experiment repeatability is good, and therefore quantitative experiments can be carried out. Secondly, the testing machine has small amplitude and good stability, can directly control the speed, the acceleration, the lead and the stroke of the lead screw by using computer software, and is convenient to operate and easy to control. And thirdly, the tester is convenient to assemble and disassemble, can be matched with other fatigue testers for use, and has wide universality.
Drawings
FIG. 1 is a schematic structural view of the middle bending micro-motion damage testing machine of the present invention;
FIG. 2 is a front view of the middle torsion fretting damage testing machine of the present invention;
FIG. 3 is a schematic view of the structure of the micro motion pad of the present invention;
FIG. 4 is an exploded view of the micro-motion pad of the present invention;
FIG. 5 is a schematic diagram of the inventive device used for fretting fatigue test;
FIG. 6 is a schematic diagram of the fretting wear test using the device of the present invention;
FIG. 7 is a control flow chart of the present invention;
the drawing comprises a base 1, a base 2, a left micro-motion bracket 3, a left lower support frame 4, an upper support frame 5, a left linear guide rail 6, a left slider 7, a left micro-motion pad 8, a test piece 9, a right micro-motion support 10, a right micro-motion support base 11, a three-jaw chuck 12, a left micro-motion support 13, a left micro-motion support base 14, a No. 1 motor 15, a left lead screw 16, a No. 3 motor 17, a coupler 18, an upper clamp 19, a right micro-motion pad 20, a right slider 21, a right lead screw 22, a right linear guide rail 23, a No. 2 motor 24, a right lower support frame 25, a micro-motion pad rear cover 26, a pressure ball 27, a spring 28, a micro-motion pad upper cover 29, a micro-motion pad intermediate 30, a pressure sensor 31, a point contact 32, a line contact 33, a surface contact 34 and a micro-motion pad lower cover.
Detailed Description
The present invention will be further fully and clearly explained in detail with reference to the drawings and examples of the present invention so that the objects, technical solutions and advantages thereof will be more apparent. The specific examples described herein are intended to be illustrative only and not limiting.
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, fig. 1 is a schematic structural view of the bending micro-motion damage testing machine of the present invention, fig. 2 is a front view thereof, and fig. 3 is a schematic structural view of a micro-motion pad;
FIG. 4 is an exploded view of the micro-motion pad; the utility model provides a turn round fine motion damage test system and experimental method based on lead screw control displacement, it mainly includes following several systems: the device comprises a test piece clamping system, a bending load applying system, a torsion load applying system and a computer control system. The motor 14, the left screw rod 15, the left linear guide rail 5, the left slide block 6 and the left micro-motion pad 7 form a closed screw rod mechanism together, wherein a stainless steel closed shell, the left linear guide rail 5 and the motor 14 are connected to form a closed mechanism, the left screw rod 15 is fixedly connected with the left jogging support 12, the left slide block 6 is provided with power by rolling friction in the closed mechanism, the left slide block 6 is connected with the left linear guide rail 5 by a sliding pair, the left micro-motion pad 7 is fixedly connected with the left slider 6 through a ball hinge, the pressure sensor 30 is arranged in the left micro-motion pad 7, wherein the left micro-motion pad 7 can respectively realize point contact/line contact/surface contact tests by replacing the point contact 31, the line contact 32 and the surface contact 33, the parts are respectively provided with two groups which are symmetrically arranged to form the bending load applying system together. The upper clamp 18 is connected with the motor 16 through the coupler 17, the motor 16 is fixedly connected to the upper support frame 4, the upper support frame 4 is fixedly connected to the left micro-motion bracket 2 through bolts, and the components jointly form the torsion load applying system. The lower end of the test piece 8 is fixed by the three-jaw chuck 11, the upper end of the test piece is fixed by the upper clamp 18, and the three-jaw chuck 11 is fixedly connected with the base 1 through bolt connection.
In example 1, when the bending and twisting fretting fatigue test is performed, as shown in fig. 5, the lower end of the test piece 8 is fixed by the three-jaw chuck 11, the upper end of the test piece is fixed by the upper clamp 18, the fretting pad 7/19 can be mounted in a contact mode selected according to the experimental idea among the point contact 31, the line contact 32 and the surface contact 33, and the slide block 6/20 is adjusted to a proper initial position by the computer control system. The required parameters are input by computer software, and the controller controls the driver to drive the motor 14/16/23 to apply proper bending alternating load and twisting alternating load to the test piece.
The magnitude of the bending alternating load is controlled by the acceleration of the lead screw 15/21 and the stiffness of the spring 27, the magnitude of the load is fed back to the controller through the pressure sensor 30 and then received and displayed by a computer, and the frequency of the load can be directly input by computer software and is realized by controlling the motor 14/23.
The frequency of the torsional alternating load is controlled by the rotating speed of the motor 16, the magnitude of the torsional alternating load is controlled by the torque of the motor 16, and the frequency and the magnitude can be measured by selecting a proper torsional angle sensor and a proper torque sensor, and then the measured values are fed back to the controller and then are received and displayed by the computer.
Thereby realizing the bending and twisting fretting fatigue test.
In embodiment 2, when the fretting wear test is implemented, as shown in fig. 6, the lower end of the test piece 8 is fixed by the three-jaw chuck 11, the upper end is free, a cantilever beam structure is formed, the right fretting pad 19 on the right side of the test piece selects a surface contact 33 to be installed and directly presses the test piece 8, the left fretting pad 7 on the left side of the test piece selects a point contact 31 or a line contact 32 to be installed, and the slide block 6 is adjusted to a proper initial position through the computer control system. The normal load is controlled by the acceleration of the left screw rod 15 and the rigidity of the spring 27, the load is fed back to the controller through the pressure sensor 30 and then received and displayed by the computer, the displacement value can be calculated through the reading of the pressure sensor and the elastic coefficient of the spring, and the load frequency can be directly input through the computer software and is realized by controlling the motor 14. The test piece is loaded with a slight vibration in the horizontal direction by the right micro-pad 19.
Thereby realizing the fretting wear test.
Claims (4)
1. The utility model provides a little moving damage test device of turn round based on lead screw control displacement which characterized in that: the bending and twisting micro-motion damage test device based on lead screw control displacement comprises a base (1), a linear guide rail (5), a sliding block (6), a micro-motion pad (7), a micro-motion support (12), a stepping motor (14), a lead screw (15), a pressure sensor (30), a micro-motion support (2), an upper support frame (4), a motor (16), a coupler (17) and an upper clamp (18);
the stepping motor (14), the lead screw (15), the linear guide rail (5), the sliding block (6) and the micro-motion pad (7) jointly form a closed lead screw mechanism, the lead screw (15) provides power for the sliding block (6) through rolling friction in the closed lead screw mechanism, the sliding block (6) is connected with the linear guide rail (5) through a sliding pair, and the micro-motion pad (7) is connected to the sliding block (6) through a ball hinge; the pressure sensor (30) is arranged in the micro-motion pad (7) and is fixedly connected with the micro-motion support (12), and the micro-motion support (12) is fixed on the base (1) through threaded connection; the stepping motor (14) drives the screw rod (15) to rotate;
the upper clamp (18) is connected with the motor (16) through the coupler (17) to form a transmission system, the motor (16) is fixedly connected to the upper support frame (4), the upper support frame (4) is fixedly connected to the micro-motion support (2) through a bolt, and the micro-motion support (2) is fixed to the base (1) through threaded connection.
2. The bending and twisting fretting damage testing device based on lead screw control displacement according to claim 1, characterized in that: the micro-motion pad (7), the sliding block (6), the linear guide rail (5) and the screw rod (15) are respectively provided with two groups, and the two groups are symmetrically arranged on two sides of the test piece (8).
3. The bending and twisting fretting damage testing device based on lead screw control displacement according to claim 2, characterized in that: the lower end of the test piece is fixed through a three-jaw chuck.
4. The bending and twisting fretting damage test device based on lead screw control displacement according to claim 2, characterized in that: the friction pairs between the micro-motion pad (7) and the test piece (8) are point contact friction pairs, line contact friction pairs and surface contact friction pairs.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122938398.1U CN217484008U (en) | 2021-11-27 | 2021-11-27 | Bending-twisting micro-motion damage test device based on lead screw displacement control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122938398.1U CN217484008U (en) | 2021-11-27 | 2021-11-27 | Bending-twisting micro-motion damage test device based on lead screw displacement control |
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| CN217484008U true CN217484008U (en) | 2022-09-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354402A (en) * | 2021-11-27 | 2022-04-15 | 北京工业大学 | Bending torsion fretting damage test system based on lead screw control displacement and test method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354402A (en) * | 2021-11-27 | 2022-04-15 | 北京工业大学 | Bending torsion fretting damage test system based on lead screw control displacement and test method thereof |
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