CN113776798A - Device and method for testing correlation between bolt tightening times and corrosion resistance - Google Patents
Device and method for testing correlation between bolt tightening times and corrosion resistance Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 90
- 238000005260 corrosion Methods 0.000 title claims abstract description 59
- 230000007797 corrosion Effects 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 42
- 150000003839 salts Chemical class 0.000 claims description 10
- 238000005536 corrosion prevention Methods 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 9
- 238000011056 performance test Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
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- 239000011248 coating agent Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 238000007747 plating Methods 0.000 description 6
- 230000003746 surface roughness Effects 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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Abstract
The invention discloses a device and a method for testing the correlation between the screwing frequency of threads and corrosion resistance, wherein the device comprises a contact base plate, a bearing base plate, a clamp system and a mounting base; the contact base plate is provided with a plurality of through holes for a plurality of bolts to simultaneously carry out tests, the bearing base plate is positioned below the contact base plate and provides a bearing for the contact base plate, the bearing base plate is provided with a plurality of through holes, and the positions and the sizes of the through holes on the bearing base plate are consistent with those of the through holes on the contact base plate; the mounting base is positioned below the bearing base plate, and the clamp system clamps and fixes the bearing base plate above the mounting base; the method and the device provide a data base for the process selection of the bolt fastener on the automobile, and avoid the situation that the corrosion resistance of the bolt matched with a certain part cannot meet the requirement due to repeated assembly and disassembly of the part.
Description
Technical Field
The invention relates to the field of bolt quality control, in particular to a device and a method for testing correlation between thread tightening times and corrosion resistance.
Background
The bolt is used as a fastener for connecting key parts of the automobile, once the bolt is corroded, broken and fails, the automobile is in failure if the bolt is light, and casualties occur if the bolt is heavy.
Recently, a certain automobile company records a recall plan to the national market supervision and management bureau, and determines that from 6 months in 2020, some imported automobiles produced in a certain period are recalled, and 3 thousands of automobiles are in total, and when some automobiles in the recall range are exposed to high-corrosion environments such as strong deicing salt and the like for a long time, bolts for fixing a steering motor on a steering engine shell can be corroded and broken, so that the steering motor is displaced, a transmission belt slides, the steering power is weakened or lost, the risk of collision of the automobiles can be increased, and potential safety hazards exist.
The coating and plating layer on the bolt is used as an anticorrosion layer, the bolt is used as a fastener for connecting different parts most commonly used by automobiles, the bolt and the part are in mutual contact in the use process, the part has certain friction and extrusion on the coating and plating layer, and for the coating and plating layers with different hardness, influences with different degrees can be formed in the contact process, and the influences can possibly cause the coating and plating layer to generate defect points, so that the integral anticorrosion capacity of the anticorrosion coating and plating layer is reduced.
The invention patent with publication number CN108225887 discloses a bolt standard component detection method, which comprises the steps of firstly carrying out an environmental test on a bolt and a nut screwed according to a standard torque value, recording the corrosion degrees of the standard component in different periods, finding a torque failure criterion value m through a statistical method, and establishing a bolt and nut corrosion degree-performance detection table; and then calculating the difference value delta M between the actual measured torque of the bolt to be detected and the initial tightening torque, and comparing the magnitude relation between the torque failure criterion value M and the delta M to judge whether the bolt and the nut are failed, but the patent does not disclose the relation between the thread tightening times and the corrosion resistance relevance.
Disclosure of Invention
The invention aims to provide a device and a method for testing the screwing frequency and the corrosion resistance, which disclose the relationship between the screwing frequency and the corrosion resistance and provide a basis for the selection of a bolt fastener process on an automobile.
In order to realize the purpose, the technical scheme of the invention is as follows:
a device for testing the relevance of bolt tightening times and corrosion resistance comprises a contact base plate, a bearing base plate, a clamp system and a mounting base; the contact base plate is provided with a plurality of through holes for a plurality of bolts to simultaneously carry out tests, the bearing base plate is positioned below the contact base plate and provides bearing for the contact base plate, the bearing base plate is provided with a plurality of through holes, and the positions and the sizes of the through holes on the bearing base plate are consistent with those of the through holes on the contact base plate; the mounting base is located bearing backing plate below, and the anchor clamps system is fixed the top at the mounting base with the bearing backing plate centre gripping.
Furthermore, the mounting base comprises a bottom plate, two ends of the bottom plate are respectively connected with a platform in the vertical direction, and a space between the two platforms in the vertical direction is a cavity; the two ends of the bearing backing plate are respectively positioned on the platforms in two vertical directions of the mounting base.
Further, the clamp system comprises two clamping plates and a bolt which are oppositely arranged, wherein the first clamping plate is fixed on the surface of the vertical platform at one end of the mounting base, the second clamping plate is movable, and the bolt penetrates through bolt holes which are oppositely arranged on the first clamping plate and the second clamping plate to fasten the clamping plates and the clamping plates.
Further, the one end of bearing backing plate hug closely splint, the second splint are placed on the mounting base and are hugged closely the another side of the same end of bearing backing plate, first splint and second splint press from both sides the one end of bearing backing plate in the middle, the one end of bearing backing plate is stretched out to the one end of first splint and second splint, fixing bolt passes first splint and the one end that the second splint stretched out the bearing backing plate and presss from both sides first splint and second splint tightly fixedly.
Further, the one end of first splint and second splint be provided with the breach of an L shape respectively, the breach symmetry of two L types sets up, the breach of L shape is located the connection face department of first splint and second splint and bearing backing plate, bearing backing plate one end is pressed from both sides between the breach of two L shapes.
Further, the clamp systems are symmetrically arranged at two ends of the bearing base plate.
Further, the bearing backing plate, the first clamping plate and the second clamping plate are all cuboids.
A method for testing the bolt tightening times and the corrosion resistance by using the device for testing the bolt tightening times and the corrosion resistance comprises the following steps:
the method comprises the following steps: a test bolt penetrates through the contact base plate and the bearing base plate and is placed on a test device;
step two: screwing the nut on the test bolt at the other end until the lower surface of the screw head is contacted with the contact backing plate and the upper surface of the nut is also contacted with the bearing backing plate;
fixing the nut by using tools such as a spanner, and screwing the test bolt by rotating the torque spanner, wherein the torque spanner stops when the set maximum torque is reached in a mode of setting the maximum torque;
step four, after standing for 10 minutes, fixing the nut by using a tool such as a wrench and the like, and loosening the test bolt by rotating the bolt until no pressure stress exists between the nut and the bearing backing plate;
step five: standing for 10 minutes, and repeating the third step and the fourth step;
step six: placing the test bolt which is not screwed down and the test bolt which is subjected to N times of screwing-loosening into a corrosion test box for corrosion resistance test;
step seven: and according to the test result, drawing a relation curve of the tightening times and the salt spray corrosion resistance test time to obtain a correlation result of the corresponding tightening times of the threaded fastener and the corrosion resistance.
Further, the maximum torque value set by the torque wrench in the third step is not more than 75% of the maximum torque value which can be borne by the test bolt and the matched nut thereof.
Further, in the fifth step, the number N of times of repeating the third step and the fourth step may be one of 1, 3, 5, and 8 times according to actual needs.
The invention has the beneficial effects that:
1. at present, the automobile research and development is carried out in a platform-based manner, the types of parts are required to be reduced as much as possible so as to reduce the development complexity and the development cost, and in the field of fasteners, the same type of fasteners are required to be used as much as possible at different positions so as to avoid the situation that all the fasteners are developed independently; however, the times of dismounting and mounting of parts at different positions in the loading process are different, part of the bolts are not dismounted when being mounted, the parts at part of the positions can be firstly screwed down and mounted on the automobile by the bolts, the parts are dismounted after electrophoresis, and other components are mounted and then mounted again after the parts are mounted; some fasteners can be disassembled and assembled for many times in the quality guarantee period; according to the invention, in the process of platform development, workers can reasonably select the fastener according to the test parameters and the development requirements of the invention, so that the situation of traffic accidents caused by the fact that the corrosion resistance of a bolt matched with a certain part does not meet the requirements due to the fact that the part needs to be disassembled and assembled for many times is avoided.
2. According to the invention, the time for the first corrosion of the bolts in different processes is obtained, so that a data basis and a basis are provided for the selection of the bolt fastener process on the automobile.
3. The testing device can simultaneously test bolts of different process types according to the difference of the hardness and the roughness of the actual contact surface of the part and the bolt, and meets the requirements of detection of the screwing times and the corrosion resistance correlation in the fastener development process.
4. The invention adopts the bolts with different coating layers for testing, and can determine the advantages and disadvantages of the corrosion resistance of the different coating layers by recording the time of the first corrosion of the different bolts.
Drawings
FIG. 1 is a partial front view of a test device according to the present invention.
FIG. 2 is a partial top view of the test device of the present invention.
FIG. 3 is an overall front view of the test apparatus of the present invention.
FIG. 4 is a table comparing the number of bolt tightening times and the salt spray corrosion resistance time for different processes.
FIG. 5 is a graph showing the correlation between the number of times of tightening bolts and the corrosion prevention ability according to different processes of the present invention.
In the figure: a test bolt 1; a nut 2; a contact pad 3; a bearing backing plate 4; a clamp system 5; a first clamp plate 51; a second splint 51; a mounting base 6; the bolt 7 is fixed.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described with reference to the accompanying drawings.
As shown in fig. 1 to 3, a device for testing the correlation between the tightening times of a bolt fastener and the corrosion resistance comprises a contact base plate 3, a bearing base plate 4, a clamp system 5 and a mounting base 6; the contact base plate 3 is provided with a plurality of through holes for a plurality of bolts to carry out tests simultaneously; the bearing backing plate 4 is positioned below the contact backing plate 3 and is used for bearing the contact backing plate 3, and the length of the bearing backing plate 4 is longer than that of the contact backing plate 3; bearing backing plate 4 also has a plurality of perforation, and the perforation position size on the bearing backing plate 4 is unanimous with the perforation position size on the contact backing plate 3, and bearing backing plate 4 uses with contact backing plate 3 mutually supports.
The support base plate 4, the first splint 51, and the second splint 52 are rectangular solids.
The bearing backing plate 4 is positioned on the installation base 6, the installation base 6 comprises a bottom plate, two ends of the bottom plate are respectively connected with a platform in the vertical direction, and a space between the two platforms in the vertical direction is a cavity; two ends of the bearing backing plate 4 are respectively lapped on two platforms in the vertical direction of the mounting base 6.
The clamp system 5 is two splint that set up relatively, one of them first splint 51 is fixed on the surface of the vertical platform of 6 one ends of mount pad, second splint 52 on one side is movable in addition, during the use, hug closely first splint 51 with the one end of bearing backing plate 4, then with second splint 52 with the symmetrical placing of first splint 51 on mount pad 6, hug closely the another side of bearing backing plate 4, first splint 51 and second splint 52 press from both sides the one end of bearing backing plate 4 in the middle, the one end of bearing backing plate 4 is stretched out to the one end of first splint 51 and second splint 52.
As shown in fig. 3, one end of each of the first splint 51 and the second splint 52 has an L-shaped notch, the two L-shaped notches are symmetrically arranged, the L-shaped notch is located at the connecting surface of the first splint 51 and the second splint 52 with the bearing backing plate 4, and one end of the bearing backing plate 4 is clamped between the two L-shaped notches; after the first clamping plate 51 and the second clamping plate 51 position the bearing cushion plate 4 at a certain fixed position, the fixing bolt 7 passes through the other end of the first clamping plate 51 and the second clamping plate 52 to clamp and fix the first clamping plate 51 and the second clamping plate 52, the same clamp system 5 is also arranged on the vertical platform at the other end of the mounting base 6 to fix the other end of the bearing cushion plate 4, thereby realizing the fixation between the bearing cushion plate 4 and the mounting base 6,
the test bolt 1 can pass through the contact base plate 3 and the bearing base plate 4 and is screwed and fixed through the nut 2.
Contact backing plate 3 and test bolt 1's spiral shell head lower surface in close contact with, contact backing plate 3 is according to the coating and plating hardness of the threaded fastener of different technologies, carry out the roughness surface design of different hardness and contact surface, the hardness that generally requires contact backing plate 3 is higher than test bolt 1, smooth or coarse surface design is then selected as required to surface roughness, contact backing plate and test bolt 1's contact surface roughness in figure 1 sets for Ra 6.5, contact backing plate 3 can design a plurality of perforation, be used for a plurality of bolts to develop simultaneously experimental.
The surface roughness of the contact surface of the contact base plate 3 and the test bolt 1 needs to be kept at a certain requirement, and when the surface roughness exceeds the range after multiple uses, the surface is reprocessed to ensure that the roughness reaches a required value.
According to the actual use condition of the vehicle, the actual screwing times of the threaded fastener is about 1-3 times, therefore, in the application case, the bolts of the same process are respectively subjected to pretreatment of no abrasion, namely, the bolts are not subjected to a 'screwing-loosening' test, the bolts are screwed for 1 time, namely, the bolts are subjected to 'screwing-loosening' test, and are screwed for 3 times, then the bolts are placed in a salt spray test box to be subjected to an artificial corrosion acceleration test, and the salt spray test time of the same corrosion degree is reached by comparing the different screwing times of the bolts of the same process, so that a correlation curve of the two is formed.
Four groups of bolts with different processes are selected for the bolt 1 in the experiment, the hardness value of the contact base plate is 50-55 HRC, the roughness is set to Ra being 6.5, the set value of the torque wrench is 20Nm, the bolt is subjected to tightening-loosening pretreatment according to the experiment steps recorded in the invention, and the number of times N of the screwing-loosening pretreatment is selected from 1 time and 3 times.
Thereafter, four groups of bolts of different processes were placed in a salt spray corrosion test chamber and tested without abrasion (without undergoing a "tightening-loosening" test), tightened 1 time (N is 1 in step e), and tightened 3 times (N is 3 in step e).
For identification convenience, the time for the first occurrence of red rust of various bolts was recorded in fig. 4 for no wear, 1 time for tightening, and 3 times for tightening, which are respectively denoted as "0 r", "1 r", and "3 r".
As can be seen from the results of fig. 4: for the bolts of four different processes adopted in the test, the corrosion resistance of the bolt of the same process which is screwed for 3 times and marked as 3r is obviously lower than that of the bolt of the same process which is not worn and marked as 0 r; the bolt adopting the processes 1 and 2 has the corrosion resistance test time of the sample marked as '1 r' when the bolt is screwed for 1 time, and is closer to the corrosion resistance time of the sample marked as '3 r' when the bolt is screwed for 3 times; the bolt adopting the process 4 has the advantages that the corrosion resistance test time of the sample marked as '1 r' is shorter when the bolt is screwed for 1 time, and is closer to the corrosion resistance time of the sample marked as '0 r' without abrasion; with the bolts of process 3, the corrosion resistance of the samples marked "1 r" was achieved at 1 tightening times, which was between the corrosion resistance of the samples marked "0 r" without wear and the samples marked "3 r" at 3 tightening times.
And (3) drawing the data of the graph 4 into a curve chart, such as the graph 5, namely obtaining a curve of the correlation between the screwing times and the corrosion prevention capacity.
By comparing the difference of the screwing times of bolts in different processes and the correlation result of the corrosion resistance, if a certain part on an automobile needs to be disassembled and assembled for many times, a worker can reasonably select a fastener according to the test parameters and the development requirements of the invention.
For example, in the four processes of the test, for a process with stronger corrosion resistance, the decay of the corrosion resistance caused by the times of 'screwing and loosening' is also more obvious, and under the condition that high corrosion resistance is actually required, the performance difference caused in the screwing process of the bolt needs to be considered.
Tests are carried out aiming at the threaded fasteners with different coating layers, and the correlation result of the tightening times and the corrosion resistance of the threaded fasteners can be obtained.
The different coatings have different corrosion resistance, and the 'salt spray test time for the initial occurrence of white rust' or 'salt spray test time for the initial occurrence of red rust' can be selected as the judgment basis for the corrosion resistance of the different coatings according to the corrosion resistance coating process of the threaded fastener.
The test device is used for performing the correlation test of the screwing times and the corrosion resistance of the threaded fastener, and comprises the following steps:
the method comprises the following steps: a test bolt 1 penetrates through a contact base plate 3 and a bearing base plate 4 and is placed on a test device;
step two: screwing the nut 2 and the test bolt 1 on the other end by hand until the lower surface of the screw head is contacted with the contact backing plate 3 and the upper surface of the nut is also contacted with the bearing backing plate 4;
fixing the nut 2 by using tools such as a spanner, and screwing the bolt 1 by rotating the torque spanner, wherein the torque spanner stops when the set maximum torque is reached in a mode of setting the maximum torque;
the maximum torque value set by the torque wrench is required to ensure that the contact backing plate 3 is in close contact with the lower surface of the screw head of the test bolt 1 and is not more than 75% of the maximum torque value borne by the test bolt 1 and the matched nut 2.
Regarding the maximum torque value which can be borne by the bolt and the matched nut, after the size specification grades of the bolt and the nut are determined, the maximum torque value which can be borne by the bolt and the matched nut can be calculated according to the existing formula; or the maximum torque value which can be borne by the bolt and the matched nut is determined by checking a tool book.
The torque of the torque wrench can be set, and the maximum torque of the torque wrench is set according to 75% of the maximum torque value which can be borne by the test bolt 1 and the matched nut 2.
Step four, after standing for 10 minutes, fixing the nut 2 by using a tool such as a wrench and the like, and loosening the test bolt 1 by rotating the bolt until no pressure stress exists between the nut 2 and the bearing backing plate 3;
regarding the compressive stress between the nut 2 and the bearing backing plate 3, if the compressive stress exists between the nut 2 and the bearing backing plate 3, the nut 2 and the bearing backing plate 3 are in a compressed state, and the contact surface has friction force, so that the nut 2 cannot be easily rotated; if there is no compressive stress between the nut 2 and the bearing plate 3, the nut 2 and the bearing plate 3 are in a state of separated surfaces without contact.
Step five: standing for 10 minutes, and repeating the third step and the fourth step, wherein the repetition times N can be selected from 1 time, 3 times, 5 times, 8 times and the like according to actual needs;
step six: placing the test bolt which is not screwed down and the test bolt 1 which is subjected to N times of screwing-loosening into a corrosion test box for carrying out an anti-corrosion performance test;
step seven: and according to the test result, drawing a relation curve of the tightening times and the salt spray corrosion resistance test time to obtain a correlation result of the corresponding tightening times of the threaded fastener and the corrosion resistance.
The wear condition of the contact surface of the threaded fastener and the sleeve, the wrench or the screwdriver needs to be noticed, if visible wear traces appear on the surface of the threaded fastener after the first step and the second step are completed, a bolt with the same process can be replaced for carrying out the experiment, or the visible wear traces are photographed and recorded, and the influence of the wear on the corrosion performance in the later period is observed.
Finally, it should be noted that: while the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that various changes in the form and details may be made therein without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A bolt tightening frequency and corrosion resistance correlation test device is characterized by comprising a contact base plate (3), a bearing base plate (4), a clamp system (5) and a mounting base (6); the contact base plate (3) is provided with a plurality of through holes for a plurality of bolts to simultaneously carry out tests, the bearing base plate (4) is positioned below the contact base plate (3) and provides bearing for the contact base plate (3), the bearing base plate (4) is provided with a plurality of through holes, and the positions and the sizes of the through holes on the bearing base plate (4) are consistent with those of the through holes on the contact base plate (3); the mounting base (6) is located below the bearing base plate (4), and the clamp system (5) clamps and fixes the bearing base plate (4) above the mounting base (6).
2. The device for testing the bolt tightening times and the corrosion resistance correlation according to claim 1, wherein the mounting base (6) comprises a bottom plate, two ends of the bottom plate are respectively connected with a platform in the vertical direction, and a space between the two platforms in the vertical direction is a cavity; two ends of the bearing backing plate (4) are respectively positioned on the platforms in two vertical directions of the mounting base (6).
3. The apparatus for testing the number of times bolts are tightened and the corrosion prevention is related to claim 1, wherein the clamp system (5) comprises two opposite clamping plates and a bolt (7), wherein a first clamping plate (51) is fixed on the surface of the vertical platform at one end of the mounting base (6), a second clamping plate (52) is movable, and the bolt (7) passes through the opposite bolt holes of the first clamping plate (51) and the second clamping plate (52) to fasten the first clamping plate (51) and the second clamping plate (52).
4. The device for testing the number of times of bolt tightening and the corrosion prevention correlation according to claim 1, wherein one end of the bearing backing plate (4) is tightly attached to a first clamping plate (51), a second clamping plate (52) is placed on the mounting base (6) and tightly attached to the other side of the same end of the bearing backing plate (4), one end of the bearing backing plate (4) is clamped between the first clamping plate (51) and the second clamping plate (52), one end of the first clamping plate (51) and one end of the second clamping plate (52) extend out of one end of the bearing backing plate (4), and the first clamping plate (51) and the second clamping plate (52) are clamped and fixed by a fixing bolt (7) penetrating through one end of the first clamping plate (51) and one end of the second clamping plate (52) extending out of the bearing backing plate (4).
5. The device for testing the bolt tightening times and the corrosion prevention correlation according to claim 3, wherein one end of each of the first clamping plate (51) and the second clamping plate (52) is provided with an L-shaped notch, the two L-shaped notches are symmetrically arranged, the L-shaped notches are located at the connecting surfaces of the first clamping plate (51) and the second clamping plate (52) and the bearing backing plate (4), and one end of the bearing backing plate (4) is clamped between the two L-shaped notches.
6. The device for testing the bolt tightening times and corrosion resistance correlation according to claim 1, wherein the clamp systems (5) are symmetrically arranged at two ends of the bearing backing plate (4).
7. The device for testing the number of times of bolt tightening and the corrosion resistance according to claim 1, wherein the supporting base plate (4), the first clamping plate (51) and the second clamping plate (52) are rectangular solids.
8. A method for performing a test of the correlation between the number of times of tightening bolts and corrosion prevention using the apparatus for testing correlation between the number of times of tightening bolts and corrosion prevention according to claim 1:
a plurality of bolts which are not screwed and are screwed on an experimental device for different times and adopt different processes are put into a corrosion test box for corrosion resistance test, and the method comprises the following steps:
the method comprises the following steps: a test bolt (1) penetrates through the contact base plate (3) and the bearing base plate (4) and is placed on a test device;
step two: screwing the nut (2) and the test bolt (1) at the other end until the lower surface of the screw head is contacted with the contact backing plate (3) and the upper surface of the nut is also contacted with the bearing backing plate (4);
fixing the nut (2) by using a tool, and then turning the bolt (1) by using a torque wrench to tighten the nut, wherein the torque wrench stops when the set maximum torque is reached in a mode of setting the maximum torque;
step four, after standing for a period of time, loosening the bolt; until no pressure stress exists between the nut (2) and the bearing backing plate (3);
step five: standing for a period of time, and repeating the third step and the fourth step;
step six: placing the test bolt which is not screwed down and the test bolt (1) which is subjected to N times of screwing-loosening into a corrosion test box for carrying out an anti-corrosion performance test;
step seven: and according to the test result, drawing a relation curve of the tightening times and the salt spray corrosion resistance test time to obtain a correlation result of the tightening times and the corrosion resistance of the corresponding bolt fastener.
9. The method for testing the number of times of tightening bolts and the corrosion prevention correlation according to claim 8, wherein the torque wrench in step three sets the maximum torque value not more than 75% of the maximum torque value that the test bolt (1) and the mating nut (2) can bear.
10. The method for testing the number of times of bolt tightening and the corrosion prevention correlation according to claim 8, wherein in the fifth step, the number of times N of repeating the third step and the fourth step is selected from one of 1, 3, 5 and 8 according to actual needs.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110971360.6A CN113776798B (en) | 2021-08-23 | 2021-08-23 | Device and method for testing correlation between screw tightening times and corrosion resistance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110971360.6A CN113776798B (en) | 2021-08-23 | 2021-08-23 | Device and method for testing correlation between screw tightening times and corrosion resistance |
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| CN113776798A true CN113776798A (en) | 2021-12-10 |
| CN113776798B CN113776798B (en) | 2023-05-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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