CN205910083U - Dash smooth compound friction and wear test device - Google Patents

Abstract

A punching-sliding compound friction and wear test device is as follows: the spherical upper test piece is clamped on the upper fixture, and the plane lower test piece is clamped by the lower fixture; Part contact; the servo motor drives the upper test piece to reciprocate up and down with the set frequency f, number of times N and displacement S through the eccentric disc, upper joint bearing, lower joint bearing, impact shaft, spring leaf, and upper fixture in turn, and the lower The test piece undergoes reciprocating impact; during the impact process, the spring piece is deformed under force, thereby realizing the combined friction and wear of punching and sliding between the upper and lower test pieces; at the same time, the three-dimensional dynamic piezoelectric sensor connected to the lower fixture measures the lower test piece The force borne is sent to the data acquisition and control system, and the friction coefficient-cycle number curve is obtained by analysis. The test device and the method thereof can conveniently cause the material to undergo combined friction and wear with adjustable stiffness. The test device has a high degree of automation and good reproducibility of test data.

Description

A punch-slip compound friction and wear test device

technical field

The utility model belongs to the technical field of tribology of mechanical engineering, in particular to a sliding compound friction and wear test device.

Background technique

The failure of mechanical parts mainly includes three forms of wear, fracture and corrosion, and according to statistics, the failure of wear is as high as 60% to 80%. Wear is the process of continuous loss of surface materials, residual deformation or other damage of objects in contact with each other during relative motion, which is the inevitable result of friction. Wear and tear will lead to changes in the size of parts, loss of precision, shortened life, and increased vibration, noise, and lubrication of the mechanical system, greatly reducing the reliability of the system, and even serious accidents.

In actual application conditions, the relative motion between the friction pairs is very complicated, and the resulting wear is often the result of the combined action of various wear forms. Sliding wear is a typical form of compound wear. Sliding wear is a combination of impact and sliding contact motions in terms of motion, but it is not a simple superposition of impact wear and sliding wear in terms of wear mechanism. The coupling effect of impact and sliding makes the mechanism of combined wear of impact and sliding very complicated. . The tangential displacement is relatively large in the combined friction and wear process of punching and sliding, which makes it easier for the wear debris to be discharged from the contact area, which often causes rapid and severe wear of the material, and in many cases is the direct cause of rapid and abnormal failure of the parts.

Punching and sliding composite friction and wear phenomena exist in a large number of various mechanical equipment and equipment, such as the friction and wear of the connection between the positioning hook of the positioner and the hook ring of the positioning support in the support structure of the electrified railway catenary, the friction and wear of the coupler buffer device The friction and wear of the coupler traction table, the coupler pin hole and the mating surface of the slave plate during work, the friction and wear of the bearing cage and the inner guide surface during work, etc. Due to the difficulty of manual control reproduction or simulation of combined impact-sliding friction and wear, scholars at home and abroad mainly focus on single impact wear and sliding wear, and research work on combined impact-sliding friction and wear has been less. The development of a new method and device for the combined friction test of impact and sliding has very important practical significance for reducing the problem of combined impact and sliding wear in engineering, improving the design of mechanical engineering, improving the safety and reliability of equipment and equipment, and saving energy. engineering application value.

Contents of the invention

The purpose of this utility model is to provide a test device for combined friction and wear of sliding and sliding. Good reproducibility.

The technical scheme adopted by the utility model to realize the purpose of the invention is: a sliding compound friction and wear test device, which is characterized in that:

A punch-slip compound friction and wear test device, characterized in that:

A precision screw lifting platform is installed on the workbench in the middle and lower part of the frame, a three-dimensional dynamic piezoelectric sensor is installed on the top of the precision screw lifting platform, and a lower fixture is installed on the top of the three-dimensional dynamic piezoelectric sensor;

The backboard of the upper part of the frame is equipped with a longitudinal servo motor, the shaft of the servo motor is connected to the inner center of the eccentric disc, the outer side of the eccentric disc is eccentrically connected to the inner ring of the upper joint bearing, and the joint of the upper joint bearing is connected to the joint of the lower joint bearing. Joint connection, the inner ring of the lower joint bearing is connected with the upper end of the impact shaft, and the lower end of the impact shaft is connected with the upper fixture through a spring piece that can be bent left and right; the middle part of the impact shaft is installed on the connecting plate connected with the beam of the back plate through a linear bearing superior;

The servo motor and the three-dimensional dynamic piezoelectric sensor are all electrically connected with the data acquisition control system.

Work process and using method of the present utility model are:

a. Clamp the spherical upper test piece on the upper fixture, and use the lower fixture to clamp the lower plane test piece; control the up and down movement of the lower fixture through the precision screw lifting platform, so that the spherical upper test piece is in contact with the lower plane test piece;

b. The data acquisition and control system controls the servo motor to move at the set frequency f and the number of times N. The servo motor drives the upper test piece through the eccentric disc, the upper joint bearing, the lower joint bearing, the impact shaft, the spring leaf and the upper clamp in order to set Reciprocate up and down with a fixed frequency f and number of times N, and reciprocate impact on the lower test piece; during the impact process, the spring piece is deformed by force, thereby realizing the combined friction and wear of the upper and lower test pieces;

c. At the same time as the combined friction and wear between the upper and lower test pieces, the three-dimensional dynamic piezoelectric sensor connected to the lower fixture measures the force on the lower test piece and sends it to the data acquisition and control system. The acquisition and control system analyzes and obtains the friction coefficient-cycle curve under the conditions of setting the sliding displacement, stiffness and frequency to characterize the dynamic characteristics of the sliding composite friction.

Compared with the prior art, the beneficial effects of the utility model are:

1. By changing the clamped angle of the lower test piece, the change of the sliding angle can be conveniently realized; the lower fixture has a simple structure, low processing cost and good structural stability, which can ensure the test piece in the process of multiple cycle sliding The middle sliding angle does not change.

2. Adjust the height of the precision screw lifting table to realize the adjustment of the sliding displacement between the test pieces. The precision screw lifting table has high repeat positioning accuracy and can accurately control the lifting displacement. Good self-locking performance can ensure that the sliding displacement does not occur during the experiment Change.

3. The speed of the servo motor can be adjusted steplessly in a wide range from 0 to 3000r/min, so that the sliding frequency of the testing machine can be adjusted in a wide range from 0 to 50Hz.

4. Compared with the shock load testing machine provided by vibrator, spring, etc., the utility model adopts a servo motor to be connected with the shock shaft through a connecting rod mechanism, which can provide a larger shock load and a stroke stroke.

5. Replacing the thickness of the spring sheet can change the contact stiffness of the testing machine, and can realize the adjustment of the sliding stiffness.

6. The force of the test piece under the plane measured by the three-dimensional dynamic piezoelectric sensor connected to the lower fixture is sent to the data acquisition and processing system for processing, and the friction coefficient-cycle number curve under the set conditions is obtained, which can characterize the impact-slip combination The dynamic characteristics of friction; and the tested material can be used for other relevant wear analysis.

In a word, the test device and test method for composite friction and wear of impact and sliding provided by the utility model can conveniently cause composite friction and wear of impact and sliding of materials with adjustable contact stiffness, and can conduct friction and wear tests of impact and friction of materials with different working conditions and specifications. The test parameters can be precisely controlled, and the friction force can be measured for automatic analysis and processing. The degree of automation is high and the reproducibility of test data is good.

Further, the spring sheet of the utility model is tightly sleeved with a spring sheet adjustment frame, and the adjustment rod at the upper end of the spring sheet adjustment frame extends into the inner chamber of the impact shaft, and the impact shaft is provided with an adjustment rod positioning screw; the spring sheet is made of 60Si2Mn material or 65Mn material.

In this way, the spring leaf adjusting frame can adjust the actual effective working length of the spring leaf, and realize the adjustment of the overall contact stiffness of the testing machine, which is convenient, simple and stable to adjust.

Further, the specific structure of the connection between the shaft of the servo motor and the inner center of the eccentric disc of the present invention is: the shaft of the servo motor is connected with the inner center of the eccentric disc through the diaphragm coupling and the transmission shaft in turn, and the transmission shaft passes through the bearing seat Installed on the crossbeam of the backplane.

The servo motor shaft and transmission shaft are connected through a diaphragm coupling, which can prevent impact loads from being transmitted to the servo motor and prevent the servo motor from being overloaded. The transmission shaft is installed on the back plate through the bearing seat, which can further prevent the servo motor from being impacted and ensure the rotation accuracy of the transmission shaft.

Further, the specific structure of installing the precision screw lifting platform on the workbench at the middle and lower part of the frame of the utility model is: the upper surface of the workbench is provided with a longitudinal T-shaped groove, and mounting nuts are embedded in the T-shaped groove, and the two-dimensional lifting platform The adjusting plate is provided with a transverse installation groove, and the installation bolt passes through the installation groove and is connected with the installation nut in the T-shaped groove.

In this way, by adjusting the horizontal position of the mounting bolts in the horizontal mounting grooves; and adjusting the longitudinal position of the mounting nuts in the longitudinal T-shaped grooves, the two-dimensional position adjustment on the horizontal plane of the precision screw lifting platform can be easily realized, so that the lower test piece It is easier to align accurately with the upper test piece.

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a front structural schematic view of an embodiment of the utility model.

Fig. 2 is a side view structural diagram of an embodiment of the utility model.

detailed description

Example

Figure 1 and Figure 2 show that a specific embodiment of the present invention is a combination friction and wear test device for punching and sliding, which is characterized in that:

A precision screw lifting platform 4 is installed on the workbench 2 in the middle and lower part of the frame 1, a three-dimensional dynamic piezoelectric sensor 21 is installed on the top of the precision screw lifting platform 4, and a lower clamp 5 is installed on the top of the three-dimensional dynamic piezoelectric sensor 21;

The back plate 1a on the top of the frame 1 is equipped with a longitudinal servo motor 10, the shaft of the servo motor 10 is connected to the inner center of the eccentric disc 13, and the outer side of the eccentric disc 13 is eccentrically connected to the inner ring of the upper joint bearing 14a, and the upper joint bearing The joint of 14a is connected with the joint of the lower joint bearing 14b, the inner ring of the lower joint bearing 14b is connected with the upper end of the impact shaft 15, and the lower end of the impact shaft 15 is connected with the upper clamp 18 through the spring piece 6 which can be bent left and right; The middle part is installed on the connecting plate 1c connected with the beam 1b of the backplane 1a through a linear bearing 8;

Both the servo motor 10 and the three-dimensional dynamic piezoelectric sensor 21 are electrically connected to the data acquisition control system.

The spring sheet 6 of this example is tightly sleeved with a spring sheet adjustment frame 17, and the adjustment rod at the upper end of the spring sheet adjustment frame 17 extends into the inner chamber of the impact shaft 15, and the impact shaft 15 is provided with an adjustment rod positioning screw 7; Sheet 6 is made of 60Si2Mn material or 65Mn material.

The specific structure that the shaft of the servo motor 10 of this example is connected to the inner center of the eccentric disc 13 is: the shaft of the servo motor 10 is connected to the inner center of the eccentric disc 13 through the diaphragm coupling 11 and the transmission shaft 12 in sequence, and the transmission shaft 12 is installed on the beam 1b of the backplane 1a through the bearing seat 9.

The specific structure of installing the precision screw lifting platform 4 on the workbench 2 at the middle and lower part of the frame 1 of this example is: the upper surface of the workbench 2 is provided with a longitudinal T-shaped groove 2a, and a mounting nut is embedded in the T-shaped groove 2a. Horizontal mounting grooves are arranged on the adjusting plate 3 of the vertical lifting platform, and the mounting bolts 22 pass through the mounting grooves and are connected with the mounting nuts in the T-shaped groove 2a.

The method of using the test device of this example to carry out the sliding compound friction and wear test is:

a. Clamp the spherical upper test piece 19 on the upper fixture 18, clamp the lower plane test piece 20 with the lower fixture 5; control the up and down movement of the lower fixture 5 through the precision screw lift table 4, so that the spherical upper test piece 19 is in line with the plane The lower test piece 20 contacts;

b. The data acquisition control system controls the servo motor 10 to move at the set frequency f and the number of times N. The servo motor 10 passes through the eccentric disc 13, the upper joint bearing 14a, the lower joint bearing 14b, the impact shaft 15, the spring leaf 6, the upper The fixture 18 drives the upper test piece 19 to reciprocate up and down at the set frequency f and number of times N, and reciprocates the lower test piece 20; The combined sliding friction and wear between the lower test pieces 20;

c. At the same time as the compound friction and wear between the upper test piece 19 and the lower test piece 20, the three-dimensional dynamic piezoelectric sensor 21 connected to the lower fixture 5 measures the force borne by the lower test piece 20 and sends it to the data Acquisition and control system, the data acquisition and control system analyzes and obtains the friction coefficient-cycle curve under the conditions of setting the sliding displacement, stiffness and frequency to characterize the dynamic characteristics of the sliding composite friction.

Claims (4)

1. a kind of sliding compound friction abrasion test device of punching it is characterised in that:

Accurate screw rod lifting platform (4), the top of accurate screw rod lifting platform (4) are provided with the workbench (2) of frame (1) middle and lower part Three-Dimensional Dynamic voltage sensor (21) is installed, lower clamp (5) is installed above Three-Dimensional Dynamic voltage sensor (21)；

The backboard (1a) on described frame (1) top is provided with longitudinal servomotor (10), the axle of servomotor (10) with partially The medial center of cartridge (13) connects, the eccentric inner ring connecting upper joint bearing (14a), upper joint bearing outside eccentric disc (13) (14a) joint is connected with the joint of ShiShimonoseki bearings (14b), and the inner ring of ShiShimonoseki bearings (14b) is upper with impacting shaft (15) End connects, and the spring leaf (6) that the lower end of impacting shaft (15) is passed through to bend right and left is connected with upper fixture (18)；Impacting shaft (15) Middle part is arranged on the connecting plate (1c) being connected with the crossbeam (1b) of backboard (1a) by linear bearing (8)；

Described servomotor (10), Three-Dimensional Dynamic piezoelectric transducer (21) are all electrically connected with data acquisition control system.

2. a kind of sliding compound friction abrasion test device of punching according to claim 1 is it is characterised in that described spring leaf (6) tightly it is cased with spring leaf adjusting bracket (17), the adjusting rod of spring leaf adjusting bracket (17) upper end stretches into the inner chamber of impacting shaft (15), and It is provided with adjusting rod Positioning screw (7) in impacting shaft (15)；Described spring leaf (6) is made up of 60si2mn material or 65mn material.

3. a kind of sliding compound friction abrasion test device of punching according to claim 1 it is characterised in that: described servo electricity The concrete structure that the axle of machine (10) is connected with the medial center of eccentric disc (13) is: the axle of servomotor (10) passes sequentially through diaphragm Shaft coupling (11), power transmission shaft (12) are connected with the medial center of eccentric disc (13), and power transmission shaft (12) passes through bearing block (9) and installs On the crossbeam (1b) of backboard (1a).

4. a kind of sliding compound friction abrasion test device of punching according to claim 1 it is characterised in that: described frame (1) concrete structure of the accurate screw rod lifting platform (4) of the upper installation of the workbench (2) of middle and lower part is: the upper surface of workbench (2) has Longitudinal t type groove (2a), is embedded with installation nut, two-dimentional lifting platform adjustable plate (3) has horizontal installation in t type groove (2a) Groove, installation bolt (22) is connected through mounting groove with the installation nut in t type groove (2a).