CN112649314B - Rockwell hardness measurement method using standard Rockwell hardness tester - Google Patents
Rockwell hardness measurement method using standard Rockwell hardness tester Download PDFInfo
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- CN112649314B CN112649314B CN202110017943.5A CN202110017943A CN112649314B CN 112649314 B CN112649314 B CN 112649314B CN 202110017943 A CN202110017943 A CN 202110017943A CN 112649314 B CN112649314 B CN 112649314B
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000007542 hardness measurement Methods 0.000 title description 13
- 238000007373 indentation Methods 0.000 claims abstract description 43
- 230000005540 biological transmission Effects 0.000 claims abstract description 36
- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 238000012360 testing method Methods 0.000 claims abstract description 28
- 238000006073 displacement reaction Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims abstract description 5
- 238000007906 compression Methods 0.000 claims abstract description 5
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 6
- 238000013101 initial test Methods 0.000 abstract description 17
- 230000009471 action Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 32
- 238000012546 transfer Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
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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
- G01N3/40—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
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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
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording 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
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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
- G01N2203/0098—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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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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)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a Rockwell hardness measuring method using a standard Rockwell hardness tester, in the last step, when an indentation rebounds under the action of initial pressure, a motor power mechanism drives a lifting beam and a mounting block to move upwards, a pressure head keeps contact with the indentation for pressing, and when a force cell sensor measures that the pressure of the pressure head is F 1 When the pressure exceeds the set pressure of the first oil passage pressure release valve, the liquid in the hydraulic cavity is discharged into the buffer cavity through the first oil passage, the compression amount of the force transmission spring is kept unchanged in the indentation rebound process, and the displacement change amount of the laser displacement sensor from the second step to the third step is H after the indentation rebound is finished 3 Indentation residual depth h= (H) 2 ‑H 1 )‑H 3 . The invention provides a Rockwell hardness measuring method capable of ensuring that an initial test pressure is maintained on a test piece by a pressure head in the process of measuring the rebound of the pressure head when the initial test pressure of the pressure head on the test piece is maintained.
Description
Technical Field
The invention relates to a Rockwell hardness measurement method using a standard Rockwell hardness tester in the field of hardness measurement and calibration.
Background
The Rockwell hardness is an index for determining hardness value by indentation deformation depth, and the basic measurement principle is that under the specified condition, the Rockwell hardness is operated by the following steps, namely, in the first step, the pressure F is tested at the beginning 1 Pressing a Rockwell hardness tester pressure head into the surface of the sample to generate an indentation, and then increasing the test pressure F 2 The indentation depth of the indenter into the test specimen increases, and then the pressure F is removed 2 Maintaining the pressure F 1 In the case of the indentation, a rebound of a certain height occurs, and the difference in height between the indentation and the initial indentation is referred to as the indentation residual depth, which represents the level of the rockwell hardness. The standard Rockwell hardness tester is used for calibrating a Rockwell hardness standard block test piece, and can also be used for directly measuring the hardness of a common test piece.
Compared with the prior art, the loading mode of the pressure head adopts weights to load, for example, the initial test pressure F is generated by the weights with certain mass 1 The test pressure F is then increased by increasing the number of weights 2 Then the newly added weight is subtracted, and finally the initial test pressure F is maintained 1 Under action, the residual depth of the indentation was measured. In the figure, item 1 represents a test piece pressed by a indenter, item 2 represents the indenter pressure F 1 Initial indentation depth generated at the time, item 3 represents the indenter pressure of F 2 The deepest indentation depth produced at the time, item 4 indicates the indenter pressure from F 2 Become F 1 The depth after rebound of the indentation, the difference in height between item 4 and item 2, is then referred to as the residual depth of the indentation. The method of manually loading the weight is tested, so that the Rockwell hardness measurement completely accords with the corresponding measurementThe mechanism has the characteristic of more accurate measurement results. However, the manual weight loading mode also has the defects of low automation degree, high labor intensity, low detection efficiency and the like, and for this purpose, the Chinese patent CN103884614B discloses a standard Rockwell hardness tester motor loading measuring mechanism.
The novel standard Rockwell hardness tester for providing loading force through the motor improves the automation degree in the Rockwell hardness testing process to a certain extent, reduces the labor intensity of workers, but can not work according to the detection principle of the Rockwell hardness, because in the Rockwell hardness testing process, three key force acts at moment, namely, initial test pressure is applied, then test pressure is increased, and finally initial test pressure is kept, the motor loading mode is realized, only the initial test pressure and the test pressure are provided, the final initial test pressure can not be kept, because in the actual operation, the motor rotates towards one direction, the spindle screw moves downwards to increase the pressure on a test piece, when the motor rotates towards the other direction, the spindle screw can generate upward displacement, the displacement leads to the fact that the pressure head is not acting on the bottom of an indentation, namely, in the last step, the condition that the bottom of the indentation is kept at the initial test pressure, the rebound quantity of the indentation exceeds the normal rebound quantity, the residual depth of the indentation is less than the actual rebound quantity, the actual rebound quantity is possibly occurring, the actual rebound quantity is less than the actual rebound quantity, and the measuring precision of the Rockwell hardness is influenced.
Disclosure of Invention
The invention aims to provide a Rockwell hardness measuring method using a standard Rockwell hardness tester, which can ensure that an initial test pressure is maintained on a test piece by a pressure head in the process of measuring the rebound of the pressure head when the initial test pressure of the pressure head on the test piece is maintained, so as to accurately obtain the residual depth of the pressure head.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a Rockwell hardness measurement method using a standard Rockwell hardness tester comprises the following steps that a motor power mechanism of the standard Rockwell hardness tester drives a lifting cross beam and a mounting block to move downwards, the mounting block transmits force to a pressure head seat and the pressure head through a force transmission spring, a first oil passage switch valve and a second oil passage switch valve on the mounting block are closed, the pressure head applies pressure to a test piece, and a force sensor measures the pressure of the pressure head to be F 1 When the motor power mechanism stops operating, the reading of the laser displacement sensor at the moment is H 1 The method comprises the steps of carrying out a first treatment on the surface of the Step two, the motor power mechanism continuously drives the lifting cross beam and the mounting block to move downwards, and the pressure sensor measures the pressure of the pressure head to be F 2 When F 2 ＞F 1 The motor power mechanism stops working, and the reading of the laser displacement sensor at the moment is H 2 The method comprises the steps of carrying out a first treatment on the surface of the Thirdly, the motor power mechanism drives the lifting cross beam and the mounting block to ascend, the pressure head keeps contact with the indentation to apply pressure, and when the pressure head pressure measured by the force transducer is F 1 When the pressure exceeds the set pressure of the first oil passage pressure release valve, the liquid in the hydraulic cavity is discharged into the buffer cavity through the first oil passage, the compression amount of the force transmission spring is kept unchanged in the indentation rebound process, and the displacement change amount of the laser displacement sensor from the second step to the third step is H after the indentation rebound is finished 3 Indentation residual depth h= (H) 2 -H 1 )-H 3 。
After the measurement is finished, the second oil duct switch valve and the atmosphere channel switch valve are opened, the motor power mechanism drives the pressure head seat and the pressure head to move upwards through the lifting cross beam and the mounting block, the pressure head is separated from the test piece, the pressure head seat drives the piston plate to move downwards through the force transmission spring, and liquid in the buffer cavity is pumped back into the hydraulic cavity through the second oil duct.
The beneficial effects of the invention are as follows: when the initial pressure of the test piece is loaded, the first oil duct switch valve and the second oil duct switch valve are closed, liquid in the hydraulic cavity can be used for transferring force, the motor power mechanism drives the moving block to move downwards, the moving block transfers force to the pressure head seat through the liquid in the hydraulic cavity and the force transfer spring, the pressure head applies the initial test pressure to the test piece, and when the initial test pressure reaches the designated pressure, the motor power mechanism stops acting; when the pressure needs to be increased for the second time, the first oil duct switch valve and the second oil duct switch valve are kept closed, the motor power mechanism continues to act, and when the specified pressure is reached, the motor power mechanism stops acting; when the pressure head is required to unload the pressure to the initial test pressure, the motor power mechanism drives the moving block to move upwards, the pressure head is acted by the force transmission spring, the pressure head cannot move upwards and keeps contact with the bottom of the pressure head until the pressure head is unloaded to the initial test pressure, then the rebound of the pressure head is waited, the first oil duct switching valve is opened in the process, the pressure head can move upwards in the rebound process of the pressure head, the force head can apply upward acting force to the force transmission spring, therefore, the liquid pressure in the hydraulic cavity can be increased, if the pressure head does not perform decompression, the acting force of the pressure head to the test piece is larger than the initial test pressure, therefore, in the rebound process of the pressure head, the liquid in the hydraulic cavity can be decompressed into the buffer cavity, the piston plate moves upwards relative to the hydraulic cavity, in the rebound process of the pressure head is kept, the compression amount of the force transmission spring is unchanged, the acting force of the pressure head to the bottom of the pressure head is always kept at the initial test pressure, the rebound process of the pressure head is ensured to accord with the Rockwell hardness measurement principle, and Rockwell hardness measurement precision is ensured.
Drawings
FIG. 1 is a schematic diagram of Rockwell hardness measurement in the background of the invention;
FIG. 2 is a schematic diagram of the structure of one embodiment of the present invention;
FIG. 3 is a schematic view of the fit of the mounting block and the ram base of FIG. 2.
Detailed Description
An example of a Rockwell hardness measurement method using a standard Rockwell hardness tester is shown in FIGS. 2 to 3: the method comprises the following steps, firstly, a motor power mechanism of a standard Rockwell hardness tester drives a lifting cross beam and a mounting block to move downwards, the mounting block transmits force to a pressure head seat and a pressure head through a force transmission spring, a first oil passage switch valve and a second oil passage switch valve on the mounting block are closed, the pressure head applies pressure to a test piece, and when the pressure head pressure is measured as F1 by a force sensor,the motor power mechanism stops acting, and the reading of the laser displacement sensor at the moment is H 1 The method comprises the steps of carrying out a first treatment on the surface of the Step two, the motor power mechanism continuously drives the lifting cross beam and the mounting block to move downwards, and the pressure sensor measures the pressure of the pressure head to be F 2 When F 2 ＞F 1 The motor power mechanism stops working, and the reading of the laser displacement sensor at the moment is H 2 The method comprises the steps of carrying out a first treatment on the surface of the Thirdly, the motor power mechanism drives the lifting cross beam and the mounting block to ascend, the pressure head keeps contact with the indentation to apply pressure, and when the pressure head pressure measured by the force transducer is F 1 When the pressure exceeds the set pressure of the first oil passage pressure release valve, the liquid in the hydraulic cavity is discharged into the buffer cavity through the first oil passage, the compression amount of the force transmission spring is kept unchanged in the indentation rebound process, and the displacement change amount of the laser displacement sensor from the second step to the third step is H after the indentation rebound is finished 3 Indentation residual depth h= (H) 2 -H 1 )-H 3 。
After the measurement is finished, the second oil duct switch valve and the atmosphere channel switch valve are opened, the motor power mechanism drives the pressure head seat and the pressure head to move upwards through the lifting cross beam and the mounting block, the pressure head is separated from the test piece, the pressure head seat drives the piston plate to move downwards through the force transmission spring, and liquid in the buffer cavity is pumped back into the hydraulic cavity through the second oil duct.
The standard Rockwell hardness tester in the Rockwell hardness measurement method comprises a rack, a motor power mechanism and a pressure head device, wherein the rack comprises a rack supporting leg 11 and a rack bedplate 12 fixed on the rack supporting leg, a left rack guide post 26 and a right rack guide post 14 are fixed at the upper end of the rack bedplate, a fixed cross beam 24 is fixed at the upper ends of the left rack guide post 26 and the right rack guide post 14, the pressure head device comprises a moving block which can move up and down under the drive of the motor power mechanism, the moving block comprises a lifting cross beam 21 which is assembled on the left rack guide post and the right rack guide post in a guiding manner, and the moving block further comprises a mounting block 38 fixed at the lower end of the lifting cross beam.
The left side and the right side of the frame are also rotatably provided with a left side transmission screw rod 27 and a right side transmission screw rod 13, the left side transmission screw rod 27 is in threaded fit with the left end of the lifting beam 21, the right side transmission screw rod 13 is in threaded fit with the right end of the lifting beam 21, and thus the lifting beam forms a nut which can not rotate but can only move up and down. The motor power mechanism comprises a gear motor 8 fixed on the lower side of the machine frame platen, the gear motor is provided with a power output shaft with an axis extending along the up-down direction, a driving gear 7 is coaxially fixed on the power output shaft, a left lead screw shaft gear 5 is coaxially fixed on the lower side of the machine frame platen on a left transmission lead screw, a right lead screw shaft gear 10 is coaxially fixed on the lower side of the machine frame platen on a right transmission lead screw 13, the left lead screw shaft gear 5 is in transmission connection with the driving gear 7 through a left transmission gear 6, and the right lead screw shaft gear 10 is in transmission connection with the driving gear 7 through a right transmission gear 9, so that the left lead screw shaft gear and the right lead screw shaft gear can synchronously rotate in the same direction under the driving of the driving gear. In addition, in order to avoid dust entering into the left transmission screw rod and the right transmission screw rod to influence transmission precision, a left shroud 25 is covered on the outer side of the left transmission screw rod, a right shroud 15 is covered on the outer side of the right transmission screw rod, an opening of the left shroud faces to the right, an opening of the right shroud faces to the left, two ends of the lifting cross beam 21 pass through the corresponding openings, a left corrugated folding plate 23 is arranged between the left end of the lifting cross beam and the upper end of the left shroud, between the left end of the lifting cross beam and the machine frame bedplate, a right corrugated folding plate 22 is arranged between the right end of the lifting cross beam and the upper end of the left shroud, and between the right end of the lifting cross beam and the machine frame bedplate.
The mounting block 38 is provided with a hydraulic cavity 35 with a downward cavity opening, a piston plate 36 is assembled in the hydraulic cavity 35 in a guiding and moving way, and the lower end of the mounting block is provided with a piston plate stop turnover edge 37 used for being in stop fit with the piston plate to limit the downward movement limit of the piston plate. The pressure head 17 is installed on the pressure head seat 20, the left and right sides of installation piece is fixed with the guide bar 29 that the axis extends along the upper and lower direction, and pressure head seat 20 direction movement is assembled on the guide bar, and the pressure head 17 is fixed in the lower extreme of pressure head seat 20, and the upper end of pressure head seat 20 is provided with force transducer 30, connects through the power transmission spring 18 that the axis extends along the upper and lower direction between piston plate 36 and the force transducer, and the upper end of specific power transmission spring is fixed in on the piston plate, and the lower extreme of power transmission spring is fixed in on the force transducer. The side of the press head seat is provided with a laser displacement sensor 28.
The installation piece is interior still to be equipped with buffer chamber 34, is provided with first oil duct 33 between buffer chamber 34's upper end and the hydraulic pressure chamber 35, is provided with second oil duct 31 between buffer chamber 34's lower extreme and the hydraulic pressure chamber 35, still is provided with the atmospheric channel 32 that is used for intercommunication buffer chamber and outside atmosphere on the installation piece 38, is provided with first oil duct ooff valve and first oil duct relief valve on the first oil duct 33, is provided with the second oil duct ooff valve on the second oil duct 31, is provided with the atmospheric channel ooff valve on the atmospheric channel. In this embodiment, the first oil passage switching valve, the second oil passage switching valve, and the atmosphere passage switching valve are all solenoid valves.
The cross slipway 16 is arranged on the lower side of the pressure head on the machine frame platen, the transverse movement of the cross slipway is driven by the transverse motor, the longitudinal movement of the cross slipway is driven by the longitudinal motor, the test piece 19 is placed on the cross slipway 16 during use, and the test piece can be driven to move back and forth and left and right through the cross slipway, so that the pressure position of the pressure head on the test piece is changed, and the indentation position is changed, so that multiple groups of data are obtained.
In the using process of the invention, the motor power mechanism drives the lifting cross beam to move downwards through the left screw shaft and the right screw shaft, the lifting cross beam and the mounting block transfer force to the pressure head seat through the force transfer spring, the pressure head applies pressure to the test piece until the reading of the force sensor is F 1 When the indentation is generated at the moment, the displacement value measured by the laser displacement sensor is zero displacement value, then the motor power mechanism continuously drives the lifting beam 21 and the mounting block 38 to descend, the force transmission spring 18 is compressed, and the acting force of the pressure head on the test piece is gradually increased to F 2 When recording one laser bitAnd reading the sensor, wherein in the process, the first oil passage switch valve and the second oil passage switch valve are in a closed state. Then the first oil duct switch valve is opened, the motor power mechanism drives the lifting cross beam to move upwards until the acting force of the pressure head on the test piece is restored to F 1 The pressure head always applies acting force to the bottom of the indentation under the action of the force transmission spring in the process for a period of time, the measuring principle required by Rockwell hardness is consistent, meanwhile, in the indentation rebound process, the pressure head moves upwards to apply upward acting force to the force transmission spring, the force transmission spring applies acting force to the piston plate, liquid in the hydraulic cavity is discharged into the buffer cavity through the first oil duct, pressure relief is realized, the force transmission spring is not compressed, and the pressure of the pressure head to the indentation is always maintained at F in the indentation rebound process 1 The residual depth of the indentation is finally measured. In the final indentation rebound process, the invention can ensure that the pressure head always keeps the initial pressure F on the bottom of the indentation 1 The method is consistent with the measuring principle of Rockwell hardness, so that the residual depth of the indentation can be accurately measured, and the Rockwell hardness value can be accurately obtained. After the measurement is finished, the motor power mechanism moves upwards with the lifting cross beam, the second oil duct switch valve and the atmosphere channel switch valve are opened, the downward movement trend is realized under the gravity action of the pressure head seat, the pressure head seat moves downwards with the piston plate through the force transmission spring, and hydraulic oil in the buffer cavity is pumped back to the hydraulic cavity through the second oil duct. In other embodiments of the present invention, a load cell may also be disposed on the underside of the pressure head mount, the load cell being located between the pressure head mount and the pressure head.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. A method for measuring rockwell hardness using a standard rockwell hardness scale, characterized by: the method comprises the following steps that firstly, a motor power mechanism of a standard Rockwell hardness tester drives a lifting cross beam and a mounting block to move downwards, the mounting block transmits force to a pressure head seat and a pressure head through a force transmission spring, a laser displacement sensor is arranged on the side face of the pressure head seat, a first oil passage switch valve and a second oil passage switch valve on the mounting block are closed, the pressure head applies pressure to a test piece, and the pressure head pressure measured by a force measuring sensor is F 1 When the motor power mechanism stops operating, the reading of the laser displacement sensor at the moment is H 1 The method comprises the steps of carrying out a first treatment on the surface of the The second step, the motor power mechanism continues to drive the lifting beam and the mounting block to move downwards, the standard Rockwell hardness tester comprises a frame, the motor power mechanism and a pressure head device, the frame comprises frame support legs and a frame bedplate fixed on the frame support legs, a left frame guide post and a right frame guide post are fixed at the upper end of the frame bedplate, a fixed beam is fixed at the upper ends of the left frame guide post and the right frame guide post, the pressure head device comprises a moving block which can move up and down under the driving of the motor power mechanism, the moving block comprises a lifting beam which is assembled on the left frame guide post and the right frame guide post in a guiding and moving mode, the moving block further comprises a mounting block fixed at the lower end of the lifting beam, and the pressure head pressure measured by the force transducer is F 2 When F 2 ＞F 1 The motor power mechanism stops working, and the reading of the laser displacement sensor at the moment is H 2 The method comprises the steps of carrying out a first treatment on the surface of the Thirdly, the motor power mechanism drives the lifting cross beam and the mounting block to ascend, the pressure head keeps contact with the indentation to apply pressure, and when the pressure head pressure measured by the force transducer is F 1 When the pressure exceeds the set pressure of the first oil passage pressure release valve, the liquid in the hydraulic cavity is discharged into the buffer cavity through the first oil passage, the compression amount of the force transmission spring is kept unchanged in the indentation rebound process, and the displacement change amount of the laser displacement sensor from the second step to the third step is H after the indentation rebound is finished 3 Indentation residual depth h= (H) 2 -H 1 ）-H 3 After the measurement is finished, a second oil passage switch valve and an atmosphere passage switch are openedThe motor power unit drives the pressure head seat and the pressure head to go upward through lifting beam and installation piece, the pressure head breaks away from with the test piece, the pressure head seat is through the piston board descending of biography power spring, liquid in the cushion chamber is in the hydraulic pressure chamber of drawing back through the second oil duct, be provided with the hydraulic pressure chamber of accent down on the installation piece, the hydraulic pressure intracavity direction is moved and is equipped with the piston board, the lower extreme of installation piece is provided with and is used for stopping the cooperation with the piston board and keeps off the piston board in order to restrict the piston board and move down extreme piston board and keep off the edge, the left and right sides of installation piece is fixed with the guide bar that the axis extends along the upper and lower direction, the pressure head seat direction moves and assembles on the guide bar, the pressure head is fixed in the lower extreme of pressure head seat, the upper end of pressure head seat is provided with force transducer, be provided with the first oil duct through the biography power spring connection that the axis extends along the upper and lower direction between piston board and the force transducer, be provided with the cushion chamber between the upper end and the hydraulic pressure chamber, be provided with the second oil duct between the lower extreme of cushion chamber and the hydraulic pressure chamber, still be provided with the second oil duct on the installation piece and be provided with the atmospheric air passageway that is used for intercommunication cushion chamber and outside atmosphere, be provided with on the first switch valve and the first oil duct, the atmospheric pressure valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110017943.5A CN112649314B (en) | 2021-01-07 | 2021-01-07 | Rockwell hardness measurement method using standard Rockwell hardness tester |
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| CN202110017943.5A CN112649314B (en) | 2021-01-07 | 2021-01-07 | Rockwell hardness measurement method using standard Rockwell hardness tester |
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| CN112649314B true CN112649314B (en) | 2024-04-05 |
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| CN114563167B (en) * | 2021-12-03 | 2025-03-07 | 浙江博来工具有限公司 | Electric drill impact durability test equipment |
| CN117782786B (en) * | 2024-02-26 | 2024-05-14 | 福建省计量科学研究院（福建省眼镜质量检验站） | Improved Shore hardness machine |
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