CN110044749B - Device for testing Cheng Yuanwei hardness of prestressed lower variable - Google Patents

Device for testing Cheng Yuanwei hardness of prestressed lower variable Download PDF

Info

Publication number
CN110044749B
CN110044749B CN201910422245.6A CN201910422245A CN110044749B CN 110044749 B CN110044749 B CN 110044749B CN 201910422245 A CN201910422245 A CN 201910422245A CN 110044749 B CN110044749 B CN 110044749B
Authority
CN
China
Prior art keywords
precise
unit
hardness
precision
test
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910422245.6A
Other languages
Chinese (zh)
Other versions
CN110044749A (en
Inventor
刘欣
赵宏伟
李磊
秦峰
赵大庆
赵甄章
李世超
赵久成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jilin University
Original Assignee
Jilin University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jilin University filed Critical Jilin University
Priority to CN201910422245.6A priority Critical patent/CN110044749B/en
Publication of CN110044749A publication Critical patent/CN110044749A/en
Application granted granted Critical
Publication of CN110044749B publication Critical patent/CN110044749B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • G01N3/40—Investigating hardness or rebound hardness
    • G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
    • G01N3/44—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid the indentors being put under a minor load and a subsequent major load, i.e. Rockwell system
    • 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
    • G01N2203/0003—Steady
    • 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
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • 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
    • G01N2203/003—Generation of the force
    • G01N2203/005—Electromagnetic means
    • G01N2203/0051—Piezoelectric means
    • 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
    • G01N2203/0076—Hardness, compressibility or resistance to crushing
    • G01N2203/0078—Hardness, compressibility or resistance to crushing using indentation
    • G01N2203/0082—Indentation characteristics measured during load
    • 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
    • G01N2203/0098—Tests specified by its name, e.g. Charpy, Brinnel, Mullen
    • 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
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/0202—Control of the test
    • G01N2203/0208—Specific programs of loading, e.g. incremental loading or pre-loading
    • 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
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0244—Tests performed "in situ" or after "in situ" use
    • 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
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
    • 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
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention relates to a device for testing the hardness of a variable Cheng Yuanwei under prestress, and belongs to the field of precision testing. The X/Z axis degree of freedom precise movement unit is powered by a precise servo motor, and precise positioning of the test point is realized through a ball screw nut pair; the variable Cheng Yaru unit is arranged on the upper side, and the Z-axis moving platform carries an advanced piezoelectric stack to finish load loading of different ranges; the test prestress loading unit realizes loading by a precision servo motor through a two-stage worm and gear speed reducing mechanism and a screw nut pair; the data acquisition unit comprises a precise tension pressure sensor, a precise pressure sensor and a precise displacement sensor. The advantages are that: novel conception, reliable structure principle, complete functions, compact structure and good compatibility with various mainstream optical microscopes.

Description

Device for testing Cheng Yuanwei hardness of prestressed lower variable
Technical Field
The invention relates to the field of precision hardness testing, in particular to the field of novel multifunctional hardness testing devices, and particularly relates to a device for testing Cheng Yuanwei hardness of a variable under prestress. The method is used for online testing of the hardness value of the new material or the coating, can test the hardness of the material under the service conditions such as pre-added tensile stress and the like, and provides a new technical method and means for research and development of the new material and research on the damage failure mechanism of the material under the service conditions.
Background
Hardness is an indicator of the ability of a material to locally resist penetration of hard objects into its surface. For the tested material, the hardness is a comprehensive index of a series of different physical properties such as elasticity, plasticity, strength, toughness, wear resistance and the like of the material reflected under the action of a certain pressure head and test force. The indentation hardness is a method commonly used for testing the hardness of metal materials. The hardness of the material is calculated by adopting a specified pressure head, pressing the pressure head into the measured material according to a certain load and measuring the residual plastic deformation of the surface of the material. According to the difference of the pressure head, load and load acting time, the hardness of the material can be divided into different hardness indexes such as Brinell hardness, rockwell hardness, vickers hardness, microhardness and the like.
The conventional hardness testing instrument generally only can adopt a single hardness testing method, and different hardness testing instruments are required to be adopted for materials with different hardness. For the material research and development unit and the material application unit, purchasing multiple hardness testing instruments increases the testing cost on one hand and the equipment maintenance cost on the other hand, so that development of a hardness testing device capable of integrating multiple hardness testing methods is needed.
On the other hand, in the actual production process, the material is often put into service under the condition of bearing complex mechanical loads such as stretching/compression. Under the action of complex mechanical load, the service performance of the material including hardness and other indexes can be obviously changed, and researches show that the existence of tensile/compressive prestress and other prestress in the material can influence indentation depth, contact area, bulge amount and the like, so that the hardness is changed. At present, a hardness testing instrument for testing the hardness of a material under the condition of prestress is not known.
The multifunctional in-situ hardness testing device is developed to test the hardness characteristics of the material under the prestress, and has very important theoretical value and practical significance for revealing the damage failure mechanism of the material under the service condition, especially the surface abrasion failure mechanism of the material under the prestress condition.
Disclosure of Invention
The invention aims to provide a device for testing the hardness of a variable Cheng Yuanwei under prestress, which solves the problems in the prior art. The invention combines with the in-situ test technology, and the indentation morphology caused by the pressure head in the hardness test process is presented and measured on line by an optical microscope. The hardness test standard is used for designing and providing different hardness test modes for users, so that optimal tests can be effectively performed on different materials. Meanwhile, the invention combines the hardness test with the tension and compression unit in a breakthrough way, provides a hardness test mode under the special working condition of tension and compression, and fills the blank in the related field.
The above object of the present invention is achieved by the following technical solutions:
the pre-stress lower variable Cheng Yuanwei hardness testing device comprises an X/Z axis degree-of-freedom precise movement unit, a variable Cheng Yaru unit, a test pre-stress loading unit and a data acquisition unit, wherein the X/Z axis degree-of-freedom precise movement unit is formed by vertically and rigidly combining an X-direction moving platform and a Z-direction moving platform, the X/Z axis degree-of-freedom precise movement unit and the test pre-stress loading unit are respectively fixed on a supporting platform 1, and the variable Cheng Yaru unit is installed on the X/Z axis degree-of-freedom precise movement unit;
the X/Z axis degree of freedom precision motion unit is: the driving torque of a precision servo motor B43 in the X-direction moving platform is transmitted to a screw rod B39 through a coupler 41, the screw rod B39 is matched with a precision nut seat B38 to convert the torque into linear motion, and the precision nut seat B38 is rigidly connected with the connecting platform 16 to transmit the linear motion; the Z-direction moving platforms have the same structure, and the Z-direction moving platforms are vertically matched with the X-direction moving platforms to realize accurate space positioning adjustment;
the variables Cheng Yaru units are: the Z-direction moving platform is controlled to realize wide-range loading by adjusting the precision servo motor B43, the piezoelectric ceramic 17 is arranged in the flexible hinge 15, displacement is output after the piezoelectric ceramic is electrified, one end of the precision pressure sensor 11 is in threaded connection with the output end of the flexible hinge 15, the other end of the precision pressure sensor is connected with the pressure head 10 through the pressure head connecting piece 18, and the displacement is transmitted to control different types of pressure heads to realize small-range loading;
the test prestress loading unit is as follows: after torque is increased and reduced through the primary worm wheel 19, the primary worm 20, the secondary worm wheel 23 and the secondary worm 24, the precise servo motor A9 drives the screw rod A32, the nut seat A30 is matched, rotary motion is converted into linear motion, the test piece lower support seat A6 and the test piece lower support seat B33 are driven to reversely move, displacement is converted into force, and test piece loading is completed.
The data acquisition unit is: the left end of the precise tension and pressure sensor 7 is fixedly connected with the left sensor fixing seat 4 through threads, the right end of the precise tension and pressure sensor 7 is rigidly connected with the lower test piece supporting seat A6, the precise tension and pressure sensor 7 acquires output data, and the tension and pressure is accurately loaded in real time through closed loop control; the precise pressure sensor 11 and the optical microscope 28 collect data, and feedback is closed-loop, so that a constant force pressing mode is realized; the precise displacement sensor 14 is rigidly and fixedly connected to the displacement sensor fixing seat 13, the displacement sensor fixing seat 13 is rigidly fixed to the flexible hinge 15, the micro-displacement sensing block 12 is displaced along with the output end of the flexible hinge 15, and the precise displacement sensor 14 generates data and outputs the data; the optical microscope 28 is rigidly fixed on the support platform 1 and the pit surface topography is acquired in situ.
The connecting platform 16 moves on the guide rail C36 through the sliding block B37, and the upper surface of the connecting platform 16 is connected with the flexible hinge 15 through screws.
The precise servo motor B43 is rigidly fixed on the supporting platform 1 through a motor fixing seat 42.
The screw rod B39 and the screw rod A32 are fixed on the connecting plate 2 through the screw rod fixing seat 40 and the screw rod supporting seat 25, and the connecting plate 2 is fixed on the supporting platform 1.
The primary worm 20 and the secondary worm 24 are sleeved on the shaft 22, two ends of the shaft 22 are fixed with the tension and compression unit fixing plate 3 through the shaft left fixing seat 26 and the shaft right fixing seat 21, and the upper end of the connecting plate 2 is in threaded connection with the tension and compression unit fixing plate 3 to drive the whole test prestress loading unit to move on the guide rail A27.
The invention has the beneficial effects that: the invention has reasonable structural layout and high space utilization rate, adopts a vertical and horizontal combined mode, and the precise double-freedom-degree moving platform is precisely controlled by a servo motor; the variable-range pressing-in is realized by utilizing the piezoelectric ceramic and flexible hinge technology to match with a motor and a ball screw, the pressing-in depth is adjustable, and the hardness test can be simultaneously carried out on the film coating and the traditional material. By means of the existing precise sensing technology, an integrated optical microscope is carried, and the data is collected in real time and then is processed by an upper computer, so that the related hardness parameters can be directly displayed. The testing device disclosed by the invention is precise and stable in transmission, innovative in coupling and strong in practicability, can realize large-range dynamic testing, and can provide reliable equipment for hardness testing of different materials and under special working conditions.
The invention breaks through the existing single-method hardness testing means, provides a test technology platform for the comprehensive integration of multiple testing means, has compact spatial layout, exquisite structure and wide application, can use the hardness measurement of film coatings made of different materials, is compatible with the traditional Brinell Rockwell and mainstream nanoindentation testing technology, carries an open optical microscope, realizes online monitoring, updates real-time data, and simultaneously adds a special working condition testing module, thereby having important significance for the discovery of new characteristics in the hardness field. The advanced piezoelectric technology is matched with the precise servo motor to realize precise loading, closed loop is adjustable, precise input and output are realized, the upper computer integrates all sensor modules, the hardness value is obtained by utilizing an algorithm, and a relation curve is constructed.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate and explain the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic view of the overall appearance structure of the present invention;
FIG. 2 is a schematic diagram of a test pre-stressing unit according to the present invention;
fig. 3 is a schematic structural diagram of the X-direction moving platform of the present invention.
In the figure: 1. a support platform; 2. a connecting plate; 3. a pulling and pressing unit fixing plate; 4. a left fixing seat of the sensor; 5. a transition plate A; 6. a test piece lower supporting seat A; 7. a precision pull pressure sensor; 8. a fixing plate is arranged on the test piece; 9. a precision servo motor A; 10. a pressure head; 11. a precision pressure sensor; 12. a micro-displacement sensing block; 13. a displacement sensor fixing seat; 14. a precision displacement sensor; 15. a flexible hinge; 16. a connecting platform; 17. piezoelectric ceramics; 18. a ram connector; 19. a first-stage worm wheel; 20. a primary worm; 21. the right shaft fixing seat, 22 and a shaft; 23. a second-stage worm wheel; 24. a secondary worm; 25. a screw rod supporting seat; 26. a left shaft fixing seat; 27. a guide rail A; 28. an optical microscope; 29. a sliding block A; 30. a nut seat A; 31. a support base; 32. a screw rod A; 33. a test piece lower supporting seat B; 34. a transition plate B; 35. a guide rail B; 36. a guide rail C; 37. a sliding block B; 38. a precision nut seat B; 39. a screw B; 40. a screw rod fixing seat; 41. a coupling; 42. a motor fixing seat; 43. and a precision servo motor B.
Detailed Description
The details of the present invention and its specific embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1 to 3, the device for testing the hardness of the variable Cheng Yuanwei under the prestress consists of four parts, namely an X/Z axis degree-of-freedom precision motion unit, a variable Cheng Yaru unit, a test prestress loading unit and a data acquisition unit. The X/Z axis degree-of-freedom precise movement unit is formed by vertically and rigidly combining an X-direction moving platform and a Z-direction moving platform, and independent parts are all powered by a precise servo motor and are converted into linear movement through a ball screw nut pair, so that the spatial precise positioning of a pressure head is realized; the variable Cheng Yaru unit is arranged on the upper side, the Z-degree-of-freedom platform realizes wide-range loading, and the micro-nano small-range loading is realized by carrying the advanced piezoelectric ceramic driving part; the test prestress loading unit is completed by a servo motor through a two-stage worm and gear speed reducing mechanism and matched with a screw nut; the data acquisition unit comprises a precise tension pressure sensor, a precise displacement sensor and an optical microscope, realizes the on-line detection of the load and the residual indentation morphology, and obtains hardness test data through the processing of an upper computer. The invention has reliable principle, complete functions, compact structure and advanced testing method, has good compatibility with various mainstream optical microscopes, performs on-line presentation and measurement on the pit morphology caused by the pressure head in the hardness testing process through the optical microscope, provides different hardness testing mode selections for a user, and can effectively perform optimal testing on different materials. The invention combines the hardness test with the tension and compression unit in a breakthrough way, provides a hardness test mode under the special working condition of tension and compression force, and fills the blank of the related field.
Referring to fig. 1 and 3, the X/Z axis degree of freedom precision motion unit according to the present invention has the following structure: the driving torque of a precision servo motor B43 in the X-direction moving platform is transmitted to a screw rod B39 through a coupler 41, the screw rod B39 is matched with a precision nut seat B38 to convert the torque into linear motion, and the precision nut seat B38 is rigidly connected with the connecting platform 16 to transmit the linear motion; the Z-direction moving platforms have the same structure, and the two platforms are vertically matched to realize accurate space positioning adjustment; the screw B39 is fixed by a screw fixing base 40, and the connection platform 16 moves on the guide rail C36 by a slider B37.
Referring to fig. 1 and 2, the variable Cheng Yaru unit structure according to the present invention is as follows: the Z-direction moving platform is controlled to realize wide-range loading by adjusting the precision servo motor B43, the upper surface of the connecting platform 16 is connected with the flexible hinge 15 through a screw, the piezoelectric ceramic 17 is installed in the flexible hinge 15, displacement is output after the power is on, one end of the precision pressure sensor 11 is in threaded connection with the output end of the flexible hinge 15, the other end of the precision pressure sensor is connected with the pressure head 10 through the pressure head connecting piece 18, the displacement is transmitted, the pressure heads of different types are controlled to realize the wide-range loading, and the precision displacement sensor 14 and the flexible hinge 15 are rigidly fixed through the displacement sensor fixing seat 13.
Referring to fig. 1 and 2, the test pre-stress loading unit according to the present invention has the following structure: after torque is increased and reduced through the primary worm wheel 19, the primary worm 20, the secondary worm wheel 23 and the secondary worm 24, the precise servo motor A9 drives the screw A32, the screw A32 is fixed through the screw support seat 25, the screw A30 is matched with the screw support seat, rotary motion is converted into linear motion, the lower support seats A, B and 33 of the test piece are driven to reversely move, displacement is converted into force, and test piece loading is completed. The first-stage worm 20 and the second-stage worm 24 are sleeved on the shaft 22, two ends of the shaft 22 are fixed with the pulling and pressing unit fixing plate 3 through the shaft left fixing seat 26 and the shaft right fixing seat 21, the upper end of the connecting plate 2 is in threaded connection with the pulling and pressing unit fixing plate 3, and the whole unit is driven to move on the guide rail A27 to realize position adjustment. The left end of the precise tension pressure sensor 7 is fixedly connected with the left sensor fixing seat 4 through threads, and the right end of the precise tension pressure sensor is rigidly connected with the lower test piece supporting seat A6. The transition plate A5 and the transition plate B34 are moved on the guide rail B35 by the slider a 29.
Referring to fig. 1 to 3, the data acquisition unit of the present invention has the following structure: the accurate pressure sensor 7 gathers output data, and closed-loop control draws accurate real-time loading of pressure, accurate pressure sensor 11 range is big, and the resolution ratio is high, accurate output indentation force, and the host computer shows, and closed-loop feedback realizes the constant force indentation mode. The precise displacement sensor 14 is fixedly and rigidly connected to the displacement sensor fixing seat 13, the micro-displacement sensing block 12 is displaced along with the output end of the flexible hinge 15, and the precise displacement sensor 14 generates data and outputs the data. The optical microscope 28 is rigidly fixed on the support platform 1 and the pit surface topography is acquired in situ. The upper computer automatically calculates and analyzes the data acquired by the precise pressure sensor 11 and the optical microscope 28 to obtain a hardness value, and the hardness value is matched with the prestretched pressure to present a relation curve.
The invention has the external dimensions of 210mm multiplied by 200mm multiplied by 360mm (length, width and height in sequence), provides a test technical platform for the comprehensive integration of various test means, and has compact space layout, exquisite structure and wide application. Meanwhile, a special working condition test module is carried, and the method can be used for finding out new characteristics in the field of hardness test.
Referring to fig. 1 to 3, the specific test method of the present invention is as follows: the tested materials are placed into the test piece lower supporting seat A6 and the lower supporting seat B33, are attached to the supporting base 31, are pressed by the test piece upper fixing plates 8 on the two sides, and are fixed by screws, so that clamping is completed. Before installation, the X-direction Z-direction distance can be adjusted by controlling the precise servo motor B43, and after the safe distance is kept, the clamping of the selected pressure head 10 can be completed. And determining a testing method, wherein if the traditional methods such as the Rockwell and the like are adopted, a wide-range mode is selected, after the pressure head is adjusted to be opposite to the tested material, the motor is controlled to press in at a certain speed and with a certain force, after the pressing is finished, the moving platform ascends, the position of the lens of the optical microscope 28 is adjusted to be opposite to the indentation, and after the basic pressure head data is input into the upper computer, other sensor data are acquired through the A/D data acquisition card, and the hardness value is displayed. If the test modes such as nano indentation are selected, other modes are selected, and the piezoelectric ceramic output indentation is controlled. If the hardness under the special working condition needs to be tested, the precise servo motor A9 is started, and after the stretching state is realized, the pressing-in is performed.
According to the hardness testing method disclosed by the invention, according to the related national standard and international standard design of the hardness test, when a metal Rockwell hardness test mode is selected, the diamond conical pressure head is replaced, so that the pressure head is contacted with the surface of a sample, and the test force is applied under the condition of no impact and vibration, and the initial test force is kept not to exceed 3 seconds. The initial test force is increased to the total test force within the time of not less than 1s and not more than 8s, the total test force is maintained for 4s plus or minus 2s, then the main test force is removed, the initial test force is maintained, and the reading is carried out after the short stabilization. When the metal Brinell test mode is selected, a hard alloy ball head with the diameter of 10mm is preferably selected, the test force holding time is 10-15 seconds, and the upper limit is not more than 650HBW. When the Vickers hardness test mode is selected, the regular rectangular pyramid diamond pressure head is replaced, the test force holding time is approximately the same, and the hardness value is obtained by matching with an optical microscope. When the nano indentation test method is selected, a small-range piezoelectric stack mode is switched to provide power, a pressure head is replaced according to the requirement, loading is maintained and unloading is carried out, and a press-in force and depth curve is read through an upper computer to obtain a hardness value.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The utility model provides a variable Cheng Yuanwei hardness testing arrangement under prestressing force which characterized in that: the X/Z axis degree-of-freedom precise motion unit is formed by vertically and rigidly combining an X-direction moving platform and a Z-direction moving platform, the X/Z axis degree-of-freedom precise motion unit and the test pre-stress loading unit are respectively fixed on a supporting platform (1), and the variable Cheng Yaru unit is arranged on the X/Z axis degree-of-freedom precise motion unit;
the X/Z axis degree of freedom precision motion unit is: the driving torque of a precision servo motor B (43) in the X-direction moving platform is transmitted to a screw rod B (39) through a coupler (41), the screw rod B (39) is matched with a precision nut seat B (38) to convert the torque into linear motion, and the precision nut seat B (38) is rigidly connected with a connecting platform (16) to transmit the linear motion; the Z-direction moving platforms have the same structure, and the Z-direction moving platforms are vertically matched with the X-direction moving platforms to realize accurate space positioning adjustment;
the variables Cheng Yaru units are: the Z-direction moving platform is controlled to realize large-range loading by adjusting the precision servo motor B (43), the piezoelectric ceramic (17) is arranged in the flexible hinge (15), displacement is output after the piezoelectric ceramic is electrified, one end of the precision pressure sensor (11) is in threaded connection with the output end of the flexible hinge (15), the other end of the precision pressure sensor is connected with the pressure head (10) through the pressure head connecting piece (18), and the displacement is transmitted to control different types of pressure heads to realize small-range loading;
the test prestress loading unit is as follows: the precise servo motor A (9) drives torque, after torque is increased and reduced through the primary worm wheel (19), the primary worm (20), the secondary worm wheel (23) and the secondary worm (24), the screw rod A (32) is driven, the screw rod A (30) is matched, rotary motion is converted into linear motion, the test piece lower supporting seat A (6) and the test piece lower supporting seat B (33) are driven to reversely move, displacement is converted into force, and test piece loading is completed.
2. The pre-stress variable Cheng Yuanwei hardness testing device according to claim 1, wherein: the data acquisition unit is: the left end of the precise tension and pressure sensor (7) is fixedly connected with the left sensor fixing seat (4) through threads, the right end of the precise tension and pressure sensor is rigidly connected with the lower test piece supporting seat A (6), the precise tension and pressure sensor (7) acquires output data, and the tension and pressure is accurately loaded in real time through closed loop control; the precise pressure sensor (11) and the optical microscope (28) collect data, feedback is closed-loop, and a constant force pressing-in mode is realized; the precise displacement sensor (14) is rigidly and fixedly connected to the displacement sensor fixing seat (13), the displacement sensor fixing seat (13) is rigidly fixed to the flexible hinge (15), the micro-displacement sensing block (12) is displaced along with the output end of the flexible hinge (15), and the precise displacement sensor (14) generates and outputs data; the optical microscope (28) is rigidly fixed on the supporting platform (1), and the pit surface morphology is collected in situ.
3. The pre-stress variable Cheng Yuanwei hardness testing device according to claim 1, wherein: the connecting platform (16) moves on the guide rail C (36) through the sliding block B (37), and the upper surface of the connecting platform (16) is connected with the flexible hinge (15) through a screw.
4. The pre-stress variable Cheng Yuanwei hardness testing device according to claim 1, wherein: the precise servo motor B (43) is rigidly fixed on the supporting platform (1) through a motor fixing seat (42).
5. The pre-stress variable Cheng Yuanwei hardness testing device according to claim 1, wherein: the screw B (39) and the screw A (32) are fixed on the connecting plate (2) through the screw fixing seat (40) and the screw supporting seat (25), and the connecting plate (2) is fixed on the supporting platform (1).
6. The pre-stress variable Cheng Yuanwei hardness testing device according to claim 1, wherein: the primary worm (20) and the secondary worm (24) are sleeved on the shaft (22), two ends of the shaft (22) are fixed with the tension and compression unit fixing plate (3) through the left shaft fixing seat (26) and the right shaft fixing seat (21), and the upper end of the connecting plate (2) is in threaded connection with the tension and compression unit fixing plate (3) to drive the whole test prestress loading unit to move on the guide rail A (27).
CN201910422245.6A 2019-05-21 2019-05-21 Device for testing Cheng Yuanwei hardness of prestressed lower variable Active CN110044749B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910422245.6A CN110044749B (en) 2019-05-21 2019-05-21 Device for testing Cheng Yuanwei hardness of prestressed lower variable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910422245.6A CN110044749B (en) 2019-05-21 2019-05-21 Device for testing Cheng Yuanwei hardness of prestressed lower variable

Publications (2)

Publication Number Publication Date
CN110044749A CN110044749A (en) 2019-07-23
CN110044749B true CN110044749B (en) 2024-02-02

Family

ID=67282858

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910422245.6A Active CN110044749B (en) 2019-05-21 2019-05-21 Device for testing Cheng Yuanwei hardness of prestressed lower variable

Country Status (1)

Country Link
CN (1) CN110044749B (en)

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1963446A (en) * 2006-12-06 2007-05-16 莱州华银试验仪器有限公司 Automatic adding and discharging carrier of sclerometer and measuring cell
CN101587050A (en) * 2009-07-20 2009-11-25 中国航空工业第一集团公司北京长城计量测试技术研究所 Novel high-precision electrical electronic Brinell hardness tester
CN103308404A (en) * 2013-06-14 2013-09-18 吉林大学 In-situ nano-indentation tester based on adjustable stretching-bending preload
CN103353431A (en) * 2013-07-12 2013-10-16 吉林大学 In-situ indentation mechanical testing device based on tensile compression and fatigue combined load mode
CN203643254U (en) * 2013-08-28 2014-06-11 吉林大学 Material performance in-situ test platform based on tension/pressure, bending and fatigue compound loads
CN104165807A (en) * 2014-08-13 2014-11-26 浙江大学 Large-deflection destruction testing device and method for prestressed concrete plate beam
CN104614254A (en) * 2015-01-22 2015-05-13 广东工业大学 Micropositioner rigidity measuring device and rigidity measuring method thereof
CN206725476U (en) * 2017-05-27 2017-12-08 吉林大学 Range-adjustable in-situ micro-nano impression/cut test device
CN107884296A (en) * 2017-10-27 2018-04-06 佛山杰致信息科技有限公司 A kind of Portable type measurement unit
CN108871972A (en) * 2018-07-11 2018-11-23 合肥工业大学 Flexible hinge micro structures bend testing apparatus with large range high precision
CN109060575A (en) * 2018-08-23 2018-12-21 吉林大学 Driving type piezoelectric actuator low-temperature in-site high-frequency reciprocating micro-moving frictional wear test platform
CN109682705A (en) * 2019-01-02 2019-04-26 吉林大学 Micro-moving frictional wear experimental rig under prestressing force
CN210154958U (en) * 2019-05-21 2020-03-17 吉林大学 Variable-range in-situ hardness testing device under prestress

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1963446A (en) * 2006-12-06 2007-05-16 莱州华银试验仪器有限公司 Automatic adding and discharging carrier of sclerometer and measuring cell
CN101587050A (en) * 2009-07-20 2009-11-25 中国航空工业第一集团公司北京长城计量测试技术研究所 Novel high-precision electrical electronic Brinell hardness tester
CN103308404A (en) * 2013-06-14 2013-09-18 吉林大学 In-situ nano-indentation tester based on adjustable stretching-bending preload
CN103353431A (en) * 2013-07-12 2013-10-16 吉林大学 In-situ indentation mechanical testing device based on tensile compression and fatigue combined load mode
CN203643254U (en) * 2013-08-28 2014-06-11 吉林大学 Material performance in-situ test platform based on tension/pressure, bending and fatigue compound loads
CN104165807A (en) * 2014-08-13 2014-11-26 浙江大学 Large-deflection destruction testing device and method for prestressed concrete plate beam
CN104614254A (en) * 2015-01-22 2015-05-13 广东工业大学 Micropositioner rigidity measuring device and rigidity measuring method thereof
CN206725476U (en) * 2017-05-27 2017-12-08 吉林大学 Range-adjustable in-situ micro-nano impression/cut test device
CN107884296A (en) * 2017-10-27 2018-04-06 佛山杰致信息科技有限公司 A kind of Portable type measurement unit
CN108871972A (en) * 2018-07-11 2018-11-23 合肥工业大学 Flexible hinge micro structures bend testing apparatus with large range high precision
CN109060575A (en) * 2018-08-23 2018-12-21 吉林大学 Driving type piezoelectric actuator low-temperature in-site high-frequency reciprocating micro-moving frictional wear test platform
CN109682705A (en) * 2019-01-02 2019-04-26 吉林大学 Micro-moving frictional wear experimental rig under prestressing force
CN210154958U (en) * 2019-05-21 2020-03-17 吉林大学 Variable-range in-situ hardness testing device under prestress

Also Published As

Publication number Publication date
CN110044749A (en) 2019-07-23

Similar Documents

Publication Publication Date Title
CN102359912B (en) Mechanical testing platform for in-situ tension/compression materials under scanning electronic microscope based on quasi-static loading
CN102331370B (en) In-situ high-frequency fatigue material mechanical test platform under scanning electron microscope based on stretching/compressing mode
CN202903617U (en) In-situ three-point bending test device
CN203643254U (en) Material performance in-situ test platform based on tension/pressure, bending and fatigue compound loads
CN111337346B (en) Micro-mechanics detection device and method
CN201133893Y (en) Multifunctional material surface behaviour tester
CN103308404A (en) In-situ nano-indentation tester based on adjustable stretching-bending preload
CN103335898B (en) In-situ testing device for micro-mechanical properties of materials under tension-shear combined loading mode
CN105067431B (en) Tensile shear preloads impression test device and method in situ
CN102384875B (en) Stretching, compression and bending combined load mode material mechanics performance test device under microscope
CN202305330U (en) Mechanics testing platform for in-situ high frequency fatigue materials under scanning electron microscope based on stretching/compressing mode
CN105973694A (en) Nano indentation testing device under stretch-four-point bending preload
CN202256050U (en) In-situ stretch/compression material mechanical test platform based on quasi-static loaded scanning electron microscope
CN203551372U (en) Platform for in situ testing micro mechanical properties of material in shearing-torsion composite load mode
CN106769452A (en) Tensile fatigue four-point bending fatigue in-situ mechanical test device and its method of testing
CN109752242B (en) Compression shear test device
CN105181436B (en) Bending preloads micro-nano impression mechanic property test method and device
CN102288501B (en) Precise nanoindentation test device
CN105181500A (en) Stretching-bending combined-load in-situ nano-indentation test device and method
CN203337492U (en) In-situ nanoindentation tester based on adjustable stretching-bending pre-load
CN103528880A (en) On-site testing platform for micromechanical property of material in shearing-torsion loading combination mode
CN113310799A (en) In-situ mechanics dynamic observation equipment under ultralow strain rate
CN105158057A (en) Apparatus and method for testing in-situ triaxial tension fatigue under multi-field coupling
CN105547858A (en) Measuring device and testing method for glass micro channel bending mechanical property
CN205015236U (en) Compound load normal position nanometer indentation testing arrangement of drawing - bending

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant