CN209707293U - Micro-moving frictional wear experimental rig under prestressing force - Google Patents

Abstract

The utility model relates to micro-moving frictional wear experimental rigs under a kind of prestressing force, belong to precision friction field.Including test pressure loading unit, prestressing force loading unit, reciprocal fine motion unit and data acquisition unit, test pressure loading unit is arranged in upside, provides power by elaborate servo electric cylinder, completes accurate closed loop pressure load；Prestressing force loading unit is arranged in downside, provides power by elaborate servo motor, cooperates two-way screw pair to complete accurate prestressing force via two-stage turbine and worm decelerator and loads；Reciprocal fine motion unit is arranged in upside, realizes shift reciprocately by accurate piezoelectric actuator output power；Data acquisition unit includes 2 D force sensor, pull pressure sensor etc..The utility model principle is reliable, compact-sized, and synchronism is high, and compensation is accurate, can provide effective means of testing for micro-moving frictional wear under prestressing force working condition.

Description

Micro-moving frictional wear experimental rig under prestressing force

Technical field

The utility model relates to material properties test field, in particular to precision friction field, espespecially a kind of prestressing force Lower micro-moving frictional wear experimental rig.It, can be to certain material herein for friction-wear test of test specimen under the conditions of prestressing force Friction and wear behavior in the process is assessed, and is provided to disclose its wearing character and micromechanism of damage under special operation condition environment Test method.

Background technique

Different from traditional sliding and rolling, fine motion (Fretting) refers to that minimum amplitude occurs for two contact surfaces Relative motion, it is typically found in vibration operating condition (such as engine operating, airflow fluctuation, thermal cycling stresses, fatigue load, electromagnetism Vibration, transmission etc.) under " approximation fastening " mechanical engagement part in, displacement amplitude is micron dimension, and fine motion can cause to contact Surface abrasion between face generates material loss and scantling variation, causes component occlusion, loosens.Fine motion can also accelerate crackle Germinating and extension, substantially reduce Predict Fatigue Life of Components, cause some catastrophic failures.

Material abrasion mechanism is sought, influence of the various factors to the progress of material wear is specified, studies new wear-resisting, anti-attrition Material and process for treating surface, it is necessary to grasp corresponding friction-wear test technology, frictional wear test device/testing machine be into The essential testing equipment of row tribological test.

During the practical military service of material, the effect of the complex stresses such as drawing/pressure inevitably will receive.In pre-add drawing/pressure Under stress condition, the micro-moving frictional wear characteristic of material can be significantly changed.The fine motion friction mill of material under the conditions of prestressing force The research of damage characteristic and failure mechanism is the important leverage that associated materials are on active service safely.However, at present under the conditions of related prestressing force The micro-moving frictional wear research of material is rarely reported, the main reason is that material is micro- under the conditions of still lacking effective prestressing force at present Dynamic abrasion abrasion test device.Therefore, it develops under the conditions of prestressing force and material micro-moving frictional wear experimental rig and carries out related examination It tests, the micro-moving frictional wear characteristic and failure mechanism for probing into material under the conditions of prestressing force have very important theoretical value and reality Border meaning.

Summary of the invention

The purpose of this utility model is to provide micro-moving frictional wear experimental rigs under a kind of prestressing force, disclose prestressing force work The micro-moving frictional wear characteristic of material and damage failure mechanism, fill up the blank of related fields under the conditions of condition.The utility model is prominent Friction-wear test is combined with the test of traditional material tensile property broken property, and accurate load control is realized by electric cylinder System is a kind of synthesis, multi-functional fretting wear microtest device.The utility model is synchronized defeated using 2 D force sensor Pressure and friction value out, and real-time perfoming feedback modifiers, it is ensured that pressure-loaded is accurate.

The utility model topology layout is reasonable, is integrally divided into up-down structure, and pressure-loaded unit is mainly arranged on top, back and forth Fine motion unit.Electric precise cylinder structure can realize directly displacement output, the load of reaction type Pressure behaviour.Accurate piezoelectric actuator is real Now controllable micro-displacement synchronous reciprocating friction.Core prestretching pressure-loaded module is mainly arranged in lower part, in conjunction with elaborate servo motor And accurate worm and gear deceleration torque increase mechanism is, it can be achieved that pressure dynamically load；By means of existing accurate sensing testing skill Art can real-time monitoring, feedback, carry out post-processing.The utility model delicate structure, transmission precision is steady, it can be achieved that dynamic adds It carries, feedback closed loop formula precisely exports, and accurate metering and analysis can be done to special operation condition environmentally conscious materials wear coefficient, to special material Micromechanics behavior and damage mechanisms in friction-wear test are furtherd investigate.

The above-mentioned purpose of the utility model is achieved through the following technical solutions:

Micro-moving frictional wear experimental rig under prestressing force, including it is test pressure loading unit, prestressing force loading unit, reciprocal Fine motion unit and data acquisition unit, test pressure loading unit are arranged in upside, are provided by elaborate servo electric cylinder 14 dynamic Power completes accurate closed loop pressure load；Prestressing force loading unit is arranged in downside, provides power by elaborate servo motor 2, via Two-stage turbine and worm decelerator cooperates two-way screw pair to complete accurate prestressing force load；Reciprocal fine motion unit is arranged in Shift reciprocately is realized by accurate 13 output power of piezoelectric actuator in side；Data acquisition unit includes 2 D force sensor 11, tension and compression Force snesor 23 etc..

The test pressure loading unit is: the direct output displacement of elaborate servo electric cylinder 14, in drive test specimen bar 12 to Plane test specimen it is close, pressure-loaded is completed after the contact of upper and lower test specimen, and pressure is realized by the feedback of 2 D force sensor 11 The accurate control of power.

The elaborate servo electric cylinder 14 is rigidly connected by electric cylinder connecting plate 17 and side support plate 16.

The prestressing force loading unit is: 2 driving torque of elaborate servo motor is via first-stage worm gear 24,3 and of level-one worm screw After second-stage worm 27,8 torque increase of second-stage worm gear are slowed down, precision lead screw 21 is driven to rotate, precision lead screw 21 and the cooperation of nut seat 20 will Rotary motion becomes the overall movement of pre-stress element supporting table 5 on the track 18, is interviewed by 9 peace of fixture under plane test specimen Part upper fixture 10 realizes prestressing force load.

The first-stage worm gear 24, second-stage worm 27 are fixed on bearing spider by a common axis 26 and precision bearing 28 On 4, bearing spider 4 and lower support platform 1 are rigidly connected.

The precision lead screw 21 is by 7 rigid support of precision ball screw bearing block, mating connection accurate nut seat 20, Accurate nut seat 20 is connected by screw to pre-stress element supporting table 5, and fixture 9 passes through transition plates 6 and answers in advance under plane test specimen Power unit supports platform 5 is rigidly connected.

The reciprocal fine motion unit is: the accurate direct output displacement of 13 output shaft of piezoelectric actuator drives upper test specimen bar 12 real Now reciprocal fine motion；Accurate piezoelectric actuator 13 is rigidly connected with actuator attachment base 15, actuator attachment base 15 and side support plate 16 rigidly fix, and upper test specimen bar 12 is threadedly coupled with the output end of accurate piezoelectric actuator 13.

The data acquisition unit is: 23 one end of pull pressure sensor and pre-stress element supporting table 5 are rigidly connected, separately One end is connect with merging with fixture nut 22 by axis hole mode with fixed base plate 19, and pull pressure sensor 23 measures prestressing force simultaneously Feedback regulation is carried out, control elaborate servo motor 2 exports accurate signal, and realization is precisely controlled；The acquisition pressure of 2 D force sensor 11 Power and frictional force, while being fed back and being compensated, guarantee the accurate output of the accurate load and frictional force of pressure.

The utility model has the beneficial effects that: compact, compact-sized, principle is reliable, and synchronism is high, compensation essence Really, effective means of testing can be provided for micro-moving frictional wear under prestressing force working condition, be widely used.Break through conventional friction abrasion Means of testing and field provide the friction-wear test technology under special prestretching compression work condition environment.Electric precise cylinder knot Structure can realize directly displacement output, feedback closed loop formula Pressure behaviour loading structure.Accurate piezoelectric actuator output micron order is reciprocal Displacement, motion frequency and displacement amplitude are adjustable；Elaborate servo motor combination double reduction mechanism realizes prestretching pressure-loaded, normal direction Load and pressure value are adjustable.Meanwhile parameter is loaded using the accurate closed-loop control of advanced sensors technology, pass through relevant control algorithm It can be voluntarily fitted parameters relationship in load loading procedure, curve is presented in acquisition.In conclusion the utility model is in nuclear industry, boat Empty space flight, power industry etc. have important application prospect.

Detailed description of the invention

Attached drawing described herein is used to provide a further understanding of the present invention, and is constituted part of this application, The illustrative example and its explanation of the utility model do not constitute the improper limit to the utility model for explaining the utility model It is fixed.

Fig. 1 is the overall appearance structural representation of the utility model；

Fig. 2 is the side structure schematic view of the utility model.

In figure: 1, lower support platform；2, elaborate servo motor；3, level-one worm screw；4, bearing spider；5, pre-stress element branch Support platform；6, transition plates；7, precision ball screw bearing block；8, second-stage worm gear；9, fixture under plane test specimen；10, on plane test specimen Fixture；11,2 D force sensor；12, upper test specimen bar；13, accurate piezoelectric actuator；14, elaborate servo electric cylinder；15, it actuates Device attachment base；16, side support plate；17, electric cylinder connecting plate；18, guide rail；19, fixed base plate；20, accurate nut seat；21, smart Close lead screw, 22, fixture nut；23, pull pressure sensor；24, first-stage worm gear；25, motor supporting base；26, axis；27, second level snail Bar；28, precision bearing.

Specific embodiment

The detailed content and its specific embodiment of the utility model are further illustrated with reference to the accompanying drawing.

Referring to shown in Fig. 1 and Fig. 2, micro-moving frictional wear experimental rig under the prestressing force of the utility model breakthroughly will Fine motion friction is combined with the test of traditional material tensile property, and realizes accurate load by electric cylinder, passes through Piezoelectric Driving It realizes accurate control, is a kind of synthesis, multi-functional fretting wear microtest device, it can be to certain material in the process Friction and wear behavior be monitored, provide test side to disclose its frictional behavior and damage method under special operation condition environment Method.The generally upper and lower three-dimensional arragement construction of the utility model, increases the integrated level of platform, specifically by trying in effective space Test pressure-loaded unit, prestretching pressure-loaded unit, reciprocal fine motion unit and data acquisition unit composition.

The test pressure loading unit is: the direct output displacement of elaborate servo electric cylinder 14, close towards plane test specimen, Pressure-loaded is carried out after being tested upper and lower test specimen contact, and the accurate of pressure is realized by the feedback closed loop of 2 D force sensor 11 Control, elaborate servo electric cylinder 14 and side support plate 16 are rigidly connected by electric cylinder connecting plate 17.

The prestretching pressure-loaded unit is: elaborate servo motor 2 is fixed on lower support by motor supporting base 25 and puts down On platform 1,2 driving torque of elaborate servo motor is via level-one worm screw 3, first-stage worm gear 24 and second-stage worm 27,8 torque increase of second-stage worm gear After deceleration, precision lead screw 21 is driven to rotate, precision lead screw 21 cooperates with nut seat 20 becomes pre-stress element branch for rotary motion The overall movement for supportting platform 5 realizes lower test specimen prestretching pressure-loaded by 9 peace interview part upper fixture 10 of fixture under plane test specimen. Wherein, first-stage worm gear 24, second-stage worm 27 are fixed on bearing spider 4 by a common axis 26 and precision bearing 28, it is ensured that Reliable transmission, bearing spider 4 and lower support platform 1 are rigidly connected.Precision lead screw 21 passes through 7 rigidity of precision ball screw bearing block Support improves the transmission stiffness of lead screw transmission link, mating connection accurate nut seat 20, accurate nut seat 20 and pre-stress element Supporting table 5 is connected by screw to, and fixture 9 is rigidly connected by transition plates 6 and pre-stress element supporting table 5 under plane test specimen.

The reciprocal fine motion unit is: the accurate direct output displacement of 13 output shaft of piezoelectric actuator drives upper test specimen bar 12 Realize reciprocal fine motion.Wherein, accurate piezoelectric actuator 13 is rigidly fixed by actuator attachment base 15 with side support plate 16, upper examination Part bar 12 is threadedly coupled with accurate 13 output end of piezoelectric actuator.

The data acquisition unit is: pull pressure sensor 23 measures pre- tension and compression and carries out feedback regulation, controls servo Motor exports accurate signal, and realization is precisely controlled；2 D force sensor 11 acquires pressure and frictional force, is equally fed back and is mended Repay, guarantee the accurate output of the accurate load and frictional force of pressure.

11 left end of 2 D force sensor and pre-stress element supporting table 5 are rigidly connected, and right end and fixture nut 22 connect It connects.By 2 D force sensor 11 and the collected signal of pull pressure sensor 23, the pressure that is voluntarily fitted in load loading procedure Curve is presented in power, frictional force, pretension relationship.

Referring to shown in Fig. 1 and Fig. 2, the specific test method is as follows for the utility model: adjusting 11 position of 2 D force sensor And fixed, test specimen under mounting plane, it is inserted into fixture 9 under plane test specimen, left and right sides cover upper planar surface test specimen upper fixture 10, in Between and both ends fix, it is ensured that no longer shake and also do not tilt, install test specimen bar 12, rigidly fix, before the mounting can be first By control 14 driver of elaborate servo electric cylinder, adjustment test specimen arrive suitable position, connection precision piezoelectric actuator 13 and by its Fixed on actuator attachment base 15, actuator attachment base 15 is screwed in side support plate 16.After ready, test Sensor states, initiation pressure loads after confirmation is stablized, and pressure is exported via 2 D force sensor 11, shows frictional force number at this time Value is zero, pressure increase, after reaching agreement numerical value, drives accurate piezoelectric actuator 13 that lower plane test specimen is driven to start reciprocal micro- Dynamic, 2 D force sensor 11 starts to acquire frictional force, and device control is driven by motor in frequency, and all data are acquired by A/D data Card acquisition carries out data calculating using host computer, processing is analyzed.

The foregoing is merely the preferred embodiments of the utility model, are not intended to limit the utility model, for ability For the technical staff in domain, various modifications and changes may be made to the present invention.It is all to made by the utility model it is any modification, Equivalent replacement, improvement etc., should be included within the scope of protection of this utility model.

Claims (8)

1. micro-moving frictional wear experimental rig under a kind of prestressing force, it is characterised in that: including test pressure loading unit, prestressing force Loading unit, reciprocal fine motion unit and data acquisition unit, test pressure loading unit are arranged in upside, by elaborate servo electricity Dynamic cylinder (14) provide power, complete accurate closed loop pressure load；Prestressing force loading unit is arranged in downside, by elaborate servo motor (2) power is provided, cooperates two-way screw pair to complete accurate prestressing force via two-stage turbine and worm decelerator and loads；Back and forth Fine motion unit is arranged in upside, realizes shift reciprocately by accurate piezoelectric actuator (13) output power；Data acquisition unit includes 2 D force sensor (11), pull pressure sensor (23).

2. micro-moving frictional wear experimental rig under prestressing force according to claim 1, it is characterised in that: the test pressure Loading unit is: elaborate servo electric cylinder (14) direct output displacement, and test specimen bar (12) is close towards plane test specimen in drive, when Pressure-loaded is completed after upper and lower test specimen contact, and realizes the accurate control of pressure by the feedback of 2 D force sensor (11).

3. micro-moving frictional wear experimental rig under prestressing force according to claim 2, it is characterised in that: the precision is watched Electric cylinder (14) are taken to be rigidly connected by electric cylinder connecting plate (17) and side support plate (16).

4. micro-moving frictional wear experimental rig under prestressing force according to claim 1, it is characterised in that: the prestressing force adds Carrier unit is: elaborate servo motor (2) driving torque is via first-stage worm gear (24), level-one worm screw (3) and second-stage worm (27), two After grade worm gear (8) torque increase is slowed down, precision lead screw (21) rotation is driven, precision lead screw (21) and nut seat (20), which cooperate, transports rotation The dynamic overall movement for becoming pre-stress element supporting table (5) passes through fixture (9) peace interview part upper fixture (10) under plane test specimen Realize prestressing force load.

5. micro-moving frictional wear experimental rig under prestressing force according to claim 4, it is characterised in that: the level-one snail Wheel (24), second-stage worm (27) are fixed on bearing spider (4) by a common axis (26) and precision bearing (28), bearing branch Seat (4) and lower support platform (1) are rigidly connected.

6. micro-moving frictional wear experimental rig under prestressing force according to claim 4, it is characterised in that: the accurate silk Thick stick (21) passes through precision ball screw bearing block (7) rigid support, mating connection accurate nut seat (20), accurate nut seat (20) It is connected by screw to pre-stress element supporting table (5), fixture (9) passes through transition plates (6) and pre-stress element under plane test specimen Supporting table (5) rigid connection.

7. micro-moving frictional wear experimental rig under prestressing force according to claim 1, it is characterised in that: the reciprocal fine motion Unit is: the accurate direct output displacement of piezoelectric actuator (13) output shaft drives upper test specimen bar (12) to realize reciprocal fine motion；It is accurate Piezoelectric actuator (13) and actuator attachment base (15) are rigidly connected, and actuator attachment base (15) and side support plate (16) are rigidly solid Fixed, upper test specimen bar (12) is threadedly coupled with the output end of accurate piezoelectric actuator (13).

8. micro-moving frictional wear experimental rig under prestressing force according to claim 1, it is characterised in that: the data are adopted Collection unit is: pull pressure sensor (23) one end and pre-stress element supporting table (5) are rigidly connected, the other end and fixture nut (22) it connects, pull pressure sensor (23) measurement prestressing force simultaneously carries out feedback regulation, and control elaborate servo motor (2) output is accurate Signal, realization are precisely controlled；2 D force sensor (11) acquires pressure and frictional force, while being fed back and being compensated, and guarantees pressure The accurate output of the accurate load and frictional force of power.