CN112414833B - Reference needle type indentation depth measuring device suitable for portable indentation instrument - Google Patents
Reference needle type indentation depth measuring device suitable for portable indentation instrument Download PDFInfo
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- CN112414833B CN112414833B CN202011312905.4A CN202011312905A CN112414833B CN 112414833 B CN112414833 B CN 112414833B CN 202011312905 A CN202011312905 A CN 202011312905A CN 112414833 B CN112414833 B CN 112414833B
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- 238000007373 indentation Methods 0.000 title claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 229910003460 diamond Inorganic materials 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 11
- 238000012360 testing method Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000007546 Brinell hardness test Methods 0.000 description 1
- 238000007545 Vickers hardness test Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013101 initial test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—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
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0078—Hardness, compressibility or resistance to crushing using indentation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—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
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
-
- 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
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- 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)
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
A reference needle type indentation depth measuring device suitable for a portable indentation instrument comprises a load sensor, a connecting block, a first indentation suite, a second indentation suite, a pressure rod, a pressure head clamp, a pressure head, a locknut, a reference needle guide rod, a reference needle, a precision guide rail assembly, an upper limiting block, a lower limiting block, a locking bolt, a grating ruler, a reading head clamp and a pre-tightening spring adjusting module; the pre-tightening spring adjusting module comprises a pre-tightening spring, a fixing plate, an adjusting screw and a locking nut, the fixing plate is arranged on the connecting block, a through hole is formed in the middle of the fixing plate and used for allowing the reference needle head to pass through, and threaded holes are formed in two sides of the through hole and matched with the adjusting screw; the upper end of the pre-tightening spring is matched with the guide rod connecting block, the lower end of the pre-tightening spring is matched with the adjusting screw, and the tensioning degree of the pre-tightening spring is adjusted through the rotating screw. The invention has the advantages of good test stability, high resolution and compact structure. And the accurate measurement of the pressing depth is realized.
Description
Technical Field
The invention belongs to the field of displacement measurement, and particularly relates to a reference pin type indentation depth measuring device suitable for a portable indentation instrument.
Background
The instrumented indentation technology is an important micro/nano mechanical experiment technology developed on the basis of the traditional Brinell hardness and Vickers hardness tests, and is mainly used for measuring the hardness and mechanical parameters of materials. The technology mainly comprises two parts of load displacement parameter measurement and mechanical property method analysis. The measuring part is mainly used for accurately recording the pressing load and the pressing depth in the pressing test process, and the analysis method is used for identifying the mechanical property of the material to be measured.
The instrumented indenter is a systematic, integrated and commercialized product of the instrumented indentation technology. The instrument calculates the relevant mechanical parameters of the tested material by acquiring, displaying and processing the press-in load and press-in depth data in the testing process in real time. The pressing depth is defined as the displacement of the pressing head vertically pressed into the surface of the material to be measured. The press-in load is defined as the load of the indenter on the material to be measured. The accuracy of the data of the indentation load and the depth measurement is directly related to the accuracy of the finally determined mechanical parameters. Therefore, accurate measurement of the press-in load and the press-in depth is the basis for identifying the mechanical property of the measured material by using the press-in method and is the core technical requirement of an instrumented press-in instrument. Accurate measurement of the penetration depth is a technical difficulty of an instrumented penetration gauge.
Disclosure of Invention
In order to overcome the defects of the conventional press-in depth measuring mode, the invention provides the reference pin type press-in depth measuring device which is good in test stability, high in resolution and compact in structure. The invention realizes the accurate measurement of the pressing depth by integrating the grating ruler displacement sensor with high resolution and the reference needle with single degree of freedom. The invention has large test stroke and high measurement precision, and has great application value in the field of measuring the press-in depth of portable press-in equipment.
The technical scheme adopted by the invention is as follows:
a reference needle type depth measuring device suitable for a portable pressing instrument comprises a load sensor, a connecting block, a first pressing line external member, a second pressing line external member, a pressing rod, a pressing head clamp, a pressing head, a locknut, a reference needle guide rod, a reference needle, a precision guide rail assembly, an upper limiting block, a lower limiting block, a locking bolt, a grating ruler, a reading head clamp and a pre-tightening spring adjusting module;
the connecting block is a carrier of the pressure head assembly, a pressure rod is arranged on the left side of the connecting block, a precision guide rail assembly and a grating ruler displacement sensor are arranged on the right side of the connecting block, the upper end of the connecting block is positioned through a shaft shoulder of the pressure rod, and the lower end of the connecting block is positioned and locked through a locknut; the upper end of the pressure rod is connected with the load sensor, and the lower end of the pressure rod is connected with the pressure head through the pressure head clamp and used for transmitting output load; the first wire pressing sleeve and the second wire pressing sleeve are arranged on the connecting block and are used for compressing the cable of the load sensor and the cable of the grating ruler reading head; the precision guide rail assembly comprises a guide rail, a sliding block and a guide rod connecting block, the guide rail is fixed on the connecting block, the sliding block is matched with the guide rail and used for carrying the guide rod connecting block, and the guide rod connecting block is arranged on the sliding block, used for installing a reference needle guide rod and a grating ruler and attached to the lower limiting block under the tension of a pre-tightening spring; the upper end of the reference needle guide rod is fixed with the guide rod connecting block, and the lower end of the reference needle guide rod is connected with the reference needle; the reading head clamp is arranged on the connecting block, and the grating ruler reading head is fixed on the clamp;
the pre-tightening spring adjusting module comprises a pre-tightening spring, a fixing plate, an adjusting screw and a locking nut, wherein the fixing plate is arranged on the connecting block, a through hole is formed in the middle of the fixing plate and used for allowing the reference needle head to pass through, and threaded holes are formed in two sides of the through hole and matched with the adjusting screw; the upper end of the pre-tightening spring is matched with the guide rod connecting block, the lower end of the pre-tightening spring is matched with the adjusting screw, and the tensioning degree of the pre-tightening spring is adjusted through the rotating screw.
Furthermore, a through hole is formed in the left side of the connecting block and used for installing a pressure rod; and an L-shaped groove is formed in the right side of the connecting block and used for mounting the precision guide rail assembly and the grating ruler displacement sensor.
The upper end of the pressure lever is connected with the load sensor through threads.
The first pressing line external member and the second pressing line external member are installed on the connecting block through bolts.
In the precision guide rail assembly, the guide rail is fixed on the connecting block through a hexagon bolt.
The upper end of the reference needle guide rod is designed into a quadrangular prism, the lower end of the reference needle guide rod is cylindrical, the upper end of the reference needle guide rod is fixed with the guide rod connecting block through a hexagon bolt, and the lower end of the reference needle guide rod is connected with the reference needle.
The reading head clamp is installed on a platform of the L-shaped groove of the connecting block, and the reading head of the grating ruler is fixed on the clamp through a bolt.
Further, the pressure head is a diamond pressure head, a spherical pressure head, a Vickers pressure head or a Bohr pressure head.
In the present invention, the indentation depth measurement process can be divided into three stages. In the first stage, before the sample is not contacted, the pressure head and the reference needle head are relatively static and move downwards to be close to the sample along with the connecting block. And in the second stage, the reference needle head contacts the surface of the sample in advance and is always attached to the surface of the sample in the contact process of the pressure head and the sample under the action of the tension of the spring, and the reading head records the relative motion between the grating ruler and the reading head. And in the third stage, after the test is finished, the pressure head and the reference needle head are relatively static and move upwards along with the connecting block to return to the initial test position.
The invention has the following beneficial effects: the invention integrates a grating ruler displacement sensor with high resolution and a reference structure with adjustable pre-tightening degree, and realizes accurate measurement of the pressing depth. The device has compact structure and stable test.
Drawings
FIG. 1 is a front view of a reference pin depth measuring device suitable for use with a portable indenter;
FIG. 2 is a right side view of a reference pin depth measuring device suitable for use with a portable indenter;
FIG. 3 is an isometric view of a reference pin depth measurement device suitable for use with a portable indenter;
FIG. 4 is an exploded view of a reference pin depth measuring device suitable for use with a portable indenter;
FIG. 5 is a partial view of a preloaded spring adjustment module;
FIG. 6 is a partial view of the relative position of the indenter and the reference tip.
The device comprises a load sensor-1, a first wire pressing sleeve piece-2, a connecting block-3, a locking nut I-4, a pressure head clamp-5, a grating ruler reading head-6, a reading head clamp-7, a pre-tightening spring adjusting module-8, a pressure rod-9, a guide rod connecting block-10, an upper limiting block-11, a precision guide rail-12, a second wire pressing sleeve piece-13, a grating ruler-14, a reference needle guide rod-15, a reference needle head-16, a diamond pressure head-17, a lower limiting block-18, a pre-tightening spring-19, a fixing plate-20, an adjusting screw-21 and a locking nut II-22.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 6, the reference needle type depth measuring device suitable for the portable indentation apparatus comprises a load sensor 1, a connecting block 3, a first wire pressing external member 2, a second wire pressing external member 13, a pressure lever 9, a pressure head clamp 5, a diamond pressure head 17, a first locking nut 4, a reference needle guide rod 15, a reference needle 16, a precision guide rail 12, a guide rod connecting block 10, an upper limiting block 11, a lower limiting block 18, a grating ruler 14, a grating ruler reading head 6, a reading head clamp 7 and a pre-tightening spring adjusting module 8.
The connecting block 3 is a carrier of the pressure head assembly, and a through hole is formed in the left side of the connecting block and used for installing the pressing rod 9. An L-shaped groove is formed in the right side of the connecting block and used for mounting a precision guide rail assembly and a grating ruler displacement reading head 6. The upper end of the connecting block is positioned through a shaft shoulder of the pressure rod, and the lower end of the connecting block is positioned and locked through a locking nut I4.
The upper end of the pressure rod 9 is connected with the load sensor 1 through threads, and the lower end of the pressure rod is connected with the diamond pressure head 17 through the pressure head clamp 5 and used for transmitting output load.
First line ball external member 2 and second line ball external member 13 pass through bolted mounting on connecting block 3 for compress tightly load sensor 1 and grating chi reading head 6's cable, avoid rocking of cable in the indentation test process to cause the influence to reading head 6 and load sensor 1.
The precision guide rail assembly comprises a precision guide rail 12, a guide rod connecting block 10 and a plurality of hexagon bolts. The guide rail is fixed on the connecting block 3 through a hexagon bolt, and the guide rod connecting block 10 is fixed with a sliding block matched with the precision guide rail and integrally slides on the guide rail. The guide rod connecting block 10 is used for installing a reference needle guide rod 15 and a grating ruler 14, and is attached to a lower limiting block 18 under the tension of a pre-tightening spring 19.
The upper end of the reference needle guide rod 15 is designed into a quadrangular prism, and the lower end is cylindrical. The upper end of the reference needle guide rod is fixed with the guide rod connecting block 10 through a hexagon bolt, and the lower end of the reference needle guide rod is connected with the reference needle 16.
Reading head anchor clamps 7 are installed on the platform of the L type recess of connecting block, grating ruler reading head 6 passes through the bolt fastening on anchor clamps, guarantees that can be stable to the depth of impressing carry out the record.
The pre-tightening spring adjusting module 8 comprises a pre-tightening spring 19, a fixing plate 20, an adjusting screw 21 and a second locking nut 22. The fixing plate 20 is mounted on the connecting block 10, a through hole is formed in the middle of the fixing plate for allowing the reference needle 16 to pass through, and threaded holes are formed in two sides of the through hole and matched with the adjusting screws 21. The upper end of the adjusting spring 19 is matched with the guide rod connecting block 10, the lower end of the adjusting spring is matched with the adjusting screw 21, and the tensioning degree of the pre-tightening spring 19 can be adjusted by rotating the screw.
The device adopts a high-resolution grating ruler displacement sensor to measure the relative displacement between the pressure head and the reference needle in the pressing-in test process, and the pressing-in depth is obtained. The device has the advantages of compact structure, stable test and convenient adjustment.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, which are intended for purposes of illustration only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the examples, but rather as being defined by the claims and the equivalents thereof which can occur to those skilled in the art upon consideration of the present inventive concept.
Claims (10)
1. A reference needle type indentation depth measuring device suitable for a portable indentation instrument is characterized by comprising a load sensor, a connecting block, a first indentation suite, a second indentation suite, a pressure rod, a pressure head clamp, a pressure head, a locknut, a reference needle guide rod, a reference needle, a precision guide rail assembly, an upper limiting block, a lower limiting block, a locking bolt, a grating ruler reading head, a reading head clamp and a pre-tightening spring adjusting module;
the connecting block is a carrier of the pressure head assembly, a pressure rod is arranged on the left side of the connecting block, a precision guide rail assembly and a grating ruler displacement sensor are arranged on the right side of the connecting block, the upper end of the connecting block is positioned through a shaft shoulder of the pressure rod, and the lower end of the connecting block is positioned and locked through a locknut; the upper end of the pressure rod is connected with the load sensor, and the lower end of the pressure rod is connected with the pressure head through the pressure head clamp and used for transmitting output load; the first wire pressing sleeve and the second wire pressing sleeve are arranged on the connecting block and are used for compressing the cable of the load sensor and the cable of the grating ruler reading head; the precision guide rail assembly comprises a guide rail, a sliding block and a guide rod connecting block, the guide rail is fixed on the connecting block, the sliding block is matched with the guide rail and used for carrying the guide rod connecting block, and the guide rod connecting block is arranged on the sliding block, used for installing a reference needle guide rod and a grating ruler and attached to the lower limiting block under the tension of a pre-tightening spring; the upper end of the reference needle guide rod is fixed with the guide rod connecting block, and the lower end of the reference needle guide rod is connected with the reference needle; the reading head clamp is arranged on the connecting block, and the grating ruler reading head is fixed on the clamp;
the pre-tightening spring adjusting module comprises a pre-tightening spring, a fixing plate, an adjusting screw and a locking nut, wherein the fixing plate is arranged on the connecting block, a through hole is formed in the middle of the fixing plate and used for allowing the reference needle head to pass through, and threaded holes are formed in two sides of the through hole and matched with the adjusting screw; the upper end of the pre-tightening spring is matched with the guide rod connecting block, the lower end of the pre-tightening spring is matched with the adjusting screw, and the tensioning degree of the pre-tightening spring is adjusted through the rotating screw.
2. The reference pin type indentation depth measuring device suitable for the portable indentation instrument as claimed in claim 1, wherein a through hole is formed at the left side of the connecting block for installing the pressing rod; and an L-shaped groove is formed in the right side of the connecting block and used for mounting the precision guide rail assembly and the grating ruler displacement sensor.
3. The reference pin indentation depth measuring device for a portable indentation instrument according to claim 1 or 2, wherein the upper end of the plunger is threadedly connected to the load cell.
4. The reference pin indentation depth measuring device of claim 1 or 2, wherein the first and second crimp sleeves are mounted to the connecting block by bolts.
5. The reference pin indentation depth measuring device for a portable indentation instrument according to claim 1 or 2, wherein the precision rail assembly is configured such that the rail is fixed to the connecting block by a hexagonal bolt.
6. The reference pin type indentation depth measuring device according to claim 1 or 2, wherein the upper end of the reference pin guide is designed as a quadrangular prism, the lower end thereof is cylindrical, the upper end of the reference pin guide is fixed to the guide connection block by a hexagonal bolt, and the lower end thereof is connected to the reference pin.
7. The reference pin indentation depth measuring device for a portable indenter of claim 1 or 2, wherein the reading head fixture is mounted on the platform of the L-shaped groove of the connecting block, and the grating scale reading head is fixed to the fixture by bolts.
8. The reference pin indentation depth measuring device of claim 1 or 2, wherein the indenter is a diamond indenter.
9. The reference pin indentation depth measuring device of claim 1 or 2, wherein the indenter is a spherical indenter.
10. The reference pin indentation depth measuring device for a portable indenter as defined in claim 1 or 2, wherein the indenter is a vickers indenter or a bosch indenter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011312905.4A CN112414833B (en) | 2020-11-20 | 2020-11-20 | Reference needle type indentation depth measuring device suitable for portable indentation instrument |
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| CN202011312905.4A CN112414833B (en) | 2020-11-20 | 2020-11-20 | Reference needle type indentation depth measuring device suitable for portable indentation instrument |
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| CN112414833A CN112414833A (en) | 2021-02-26 |
| CN112414833B true CN112414833B (en) | 2021-08-03 |
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| CN112858008A (en) * | 2021-03-19 | 2021-05-28 | 北京市智通建筑设备厂 | Heated board detection device for building |
| CN114136794A (en) * | 2021-10-21 | 2022-03-04 | 大冶特殊钢有限公司 | Method for detecting actual rolling reduction of forging steel material of hydraulic press |
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| CN112414833A (en) | 2021-02-26 |
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