CN112197921A - Method for measuring local rigidity of wheel fender wheel arch mounting hole - Google Patents
Method for measuring local rigidity of wheel fender wheel arch mounting hole Download PDFInfo
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- CN112197921A CN112197921A CN202011002518.0A CN202011002518A CN112197921A CN 112197921 A CN112197921 A CN 112197921A CN 202011002518 A CN202011002518 A CN 202011002518A CN 112197921 A CN112197921 A CN 112197921A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000006073 displacement reaction Methods 0.000 claims abstract description 72
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 4
- 239000010959 steel Substances 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 description 15
- 238000013461 design Methods 0.000 description 9
- 238000009434 installation Methods 0.000 description 7
- 239000002184 metal Substances 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0016—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of aircraft wings or blades
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
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- Aviation & Aerospace Engineering (AREA)
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- Force Measurement Appropriate To Specific Purposes (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a method for measuring local rigidity of a wheel fender wheel arch mounting hole, which comprises the following steps of: mounting a hanging ring, a nut and a gasket on a wheel arch mounting hole of the fender; connecting a draw hook of the lifting ring with a tensile machine through a steel wire rope, bonding a displacement measuring ball connected with a displacement sensor at the bottom of the draw hook end of the lifting ring, and recording the initial displacement value S1 of the displacement sensor at the moment; the tensile machine applies an acting force, when the reading of the tensile machine reaches a preset value N, the acting force is stopped to be applied, and the current displacement value S2 of the displacement sensor is recorded; gradually reducing the acting force of the tensile machine, and recording the current return displacement value S3 of the displacement sensor when the reading of the acting force of the tensile machine is 0N; and calculating the local rigidity k of the wheel arch mounting hole on the fender. The invention not only can accurately obtain the local rigidity of the wheel fender upper wheel arch mounting hole position, but also can correctly simulate whether the impact force generated by wheel arch disassembly can cause the local deformation of the wheel fender upper wheel arch mounting hole.
Description
Technical Field
The invention relates to the field of fender rigidity measurement, in particular to a method for measuring local rigidity of a fender wheel arch mounting hole.
Background
Fender stiffness refers to the ability of a vehicle body to resist deformation when subjected to typical external forces that do not damage the body during use and assembly of the vehicle fender. The rigidity of the fender is an important performance of the fender, and if the rigidity of the fender is insufficient, an overlarge assembly gap can be generated, or quality defects are displayed in the using process to influence the overall quality of a vehicle. The rigidity of the fender must be tested in time in the early stage of design to ensure the performance requirement.
The wheel fender is provided with the wheel arch, the wheel arch is generally mounted by adopting a plastic buckle (as shown in figures 5-7, 1 is the wheel fender, 8 is the wheel arch, and 9 is the buckle), and the wheel fender has the advantages of easiness in mounting, low cost and the like. The installation form of the buckle is that a hole is formed on the fender firstly, the root part of the buckle is arranged on the wheel arch, the buckle is clamped by utilizing the structural characteristics that the front part of the buckle is small and the rear part of the buckle is large, and the flying wing can be elastically deformed, the flying wing returns to the original size after being clamped, the diameter of the flying wing is slightly larger than the hole of the fender, and the fixation is finished. When the buckle is disassembled, the buckle needs to be pulled out with force. Installation and dismantlement process, because of the biggest diameter ratio fender trompil of buckle slightly bigger, can give the certain impact force in mounting hole position at installation and dismantlement in-process, especially in later maintenance and the repair process, dismantlement personnel's specialty is not like the installer, and the dismantlement process also needs bigger power than the installation, and the violence operation of dismantlement personnel leads to fender local deformation very easily. The fender and the wheel arch are enabled to generate gaps, the surface is poor and the like, even the edge cutting corrosion risk exists, the attractiveness is easily influenced, and the experience and the feeling of a user are poor.
The existing fender rigidity measuring method only has a pressing rigidity test aiming at an installation working condition, does not have a tensile rigidity test aiming at a disassembly working condition, and does not measure the local rigidity of a fender wheel arch mounting hole. In view of this, a test of local rigidity of the fender simulating the wheel arch removal process is necessary and urgent.
Disclosure of Invention
The invention aims to provide a method for measuring the local rigidity of a wheel fender wheel arch mounting hole, which can accurately obtain the local rigidity of the wheel fender wheel arch mounting hole position through the maximum deformation and the residual deformation, can correctly simulate the production in the development stage and can also provide a basis for the design of the wheel fender wheel arch mounting hole, wherein the impact force generated by wheel arch detachment possibly occurs in the vehicle using process of a user can cause the local deformation of the wheel arch mounting hole on the wheel fender.
According to one aspect of the invention, a method for measuring local rigidity of a wheel fender wheel arch mounting hole is provided, and the method comprises the following steps:
fixing a fender (1) to be tested on a test bed, installing a lifting ring (3) on a wheel arch mounting hole (2) of the fender (1), wherein the drag hook end of the lifting ring (3) is arranged on one side, facing the outside of the vehicle, of the fender (1), the lifting ring (3) is fixed by sleeving nuts (4) at the inner end and the outer end of the fender (1), and a gasket (5) is sleeved between the nuts (4) and the fender (1);
secondly, connecting the draw hook of the lifting ring (3) with a tensile machine through a steel wire rope, adhering a displacement measuring ball (6) to the bottom of the draw hook end of the lifting ring (3), connecting the displacement measuring ball (6) with a displacement sensor (7), arranging the displacement sensor (7) on a test bed, and recording the initial displacement value S1 of the displacement sensor (7);
step three, the tensile machine exerts an acting force on the draw hook of the lifting ring (3) along the normal direction of the mounting surface of the wheel arch mounting hole (2), when the reading of the tensile machine reaches a preset value N, the acting force is stopped being exerted, and the current displacement value S2 of the displacement sensor (7) is recorded;
step four, gradually reducing the acting force of the tensile machine, and recording the current return displacement value S3 of the displacement sensor (7) when the reading of the acting force of the tensile machine is 0N;
and fifthly, calculating the local rigidity k of the wheel arch mounting hole (2) on the fender (1).
The gasket (5) is arranged to prevent local deformation and scratch of a wheel arch mounting hole on the fender caused by the nut in the screwing process. The displacement measuring ball (6) is adhered to a proper position (a proper position is a position close to the side of the mounting hole and not interfered with other equipment) at the bottom of the draw hook end of the hanging ring (3) by glue or other methods, and the connected displacement sensor (7) can be displaced along the force direction during measurement.
Preferably, the predetermined value N of the acting force exerted by the tensile machine is the acting force exerted by the maximum deformation amount specified by the wheel arch mounting hole (2) on the fender (1), and under the acting force of the predetermined value N exerted by the tensile machine, the displacement amount of the deformation of the wheel arch mounting hole (2) measured by the moving sensor (7) is the maximum displacement amount of the deformation of the wheel arch mounting hole (2) on the fender (1) (S2-S1).
Preferably, local rigidity k of wheel arch mounting holes (2) on the fender (1) is as follows: and k is N/(S2-S1).
Preferably, when the acting force applied by the tensile machine is gradually reduced to 0N from a preset value N, the deformation displacement of the wheel arch mounting hole (2) measured by the motion sensor (7) is the deformation residual displacement (S3-S1) of the wheel arch mounting hole (2) on the fender (1). Fender (1) goes up the residual displacement volume that wheel arch mounting hole (2) warp and can react the violence and dismantle the back, after installing the wheel arch again, the gap of wheel arch and fender, this gap can directly influence the outward appearance to and influence customer experience and feel.
Preferably, when the tensile machine applies acting force to the draw hook of the hanging ring (3) along the normal direction of the mounting surface of the wheel arch mounting hole (2), the acting force applied by the current tensile machine and the displacement value measured by the corresponding displacement sensor (7) are recorded at intervals of 0.02s, and the values are exported to Excel to generate a force-displacement curve graph. The generated force-displacement curve graph is convenient for data analysis and test report composition.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention relates to a method for measuring the local rigidity of a wheel fender wheel arch mounting hole, which can accurately obtain the local rigidity of the wheel fender wheel arch mounting hole position by measuring the maximum deformation of the wheel arch mounting hole deformation, and provides a test method capable of simulating the local deformation of the wheel fender wheel arch mounting hole position in the disassembling process;
(2) according to the method for measuring the local rigidity of the wheel arch mounting hole of the fender, disclosed by the invention, the residual displacement of deformation of the wheel arch mounting hole on the fender is measured, so that the gap between the wheel arch and the fender after the wheel arch is dismounted violently and mounted can be measured, a data basis is provided for structural optimization during structural design, and the gap caused by local deformation of the wheel arch mounting hole on the fender after the wheel arch is dismounted and mounted can be effectively avoided;
(3) the method for measuring the local rigidity of the wheel fender wheel arch mounting hole enables production and whether impact force generated by wheel arch dismounting possibly occurring in the process of using a vehicle by a user can cause local deformation of the wheel arch mounting hole on the wheel fender to be correctly simulated in a development stage, and also provides a basis for designing the wheel arch mounting hole on the wheel fender;
(4) the method for measuring the local rigidity of the wheel fender wheel arch mounting hole can provide optimization suggestions for design, and can effectively avoid the risks of surface difference and gaps between the wheel fender and the wheel arch and even the risk of opening, trimming and corrosion of the wheel fender caused by insufficient local rigidity of the wheel fender wheel arch mounting hole in the process of using a vehicle by a user;
(5) the method for measuring the local rigidity of the wheel fender wheel arch mounting hole not only can simply and quickly measure the local rigidity of the wheel arch mounting hole on the wheel fender, but also has the advantages of simple and easily obtained device and low cost during the measurement;
(6) the method for measuring the local rigidity of the fender wheel arch mounting hole can be popularized to measuring points such as the local rigidity measurement of the mounting point of a rear bumper on a side wall metal plate, the local rigidity measurement of the mounting point of a tail lamp on the side wall metal plate and the like, and has wide application range;
(7) the method for measuring the local rigidity of the wheel fender wheel arch mounting hole is simple, ingenious in design and remarkable in effect;
(8) the method for measuring the local rigidity of the wheel fender wheel arch mounting hole has the advantages of higher measurement result precision, strong credibility and strong practicability, and is suitable for large-scale popularization.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural view of a fender and wheel arch mounting hole;
FIG. 2 is an installation schematic view of a fender wheel arch mounting hole local stiffness measurement of the present invention;
FIG. 3 is a schematic view of the inside of a fender during the measurement of the local rigidity of the wheel fender wheel arch mounting hole of the invention;
FIG. 4 is a schematic view of an exterior fender mounting feature during local stiffness measurement of a fender wheel arch mounting hole of the present invention;
FIG. 5 is a schematic view of a fender and wheel arch configuration;
FIG. 6 is a schematic view of the fender and wheel arch installation;
FIG. 7 is a schematic structural view of the buckle;
fig. 8 is a force-displacement graph.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Examples
The embodiment provides a method for measuring local rigidity of a wheel fender wheel arch mounting hole, wherein the structure of a wheel fender and the wheel arch mounting hole is shown in the attached drawing 1 in detail, the mounting schematic diagram of the wheel fender wheel arch mounting hole during local rigidity measurement is shown in the attached drawings 2-4 in detail, and the measuring method comprises the following steps:
fixing a fender 1 to be tested on a test bed, installing a lifting ring 3 on a wheel arch mounting hole 2 of the fender 1, arranging a drag hook end of the lifting ring 3 on one surface of the fender 1 facing the outside of the vehicle, sleeving nuts 4 at the inner end and the outer end of the fender 1 for fixing the lifting ring 3, and sleeving a gasket 5 between the nuts 4 and the fender 1;
connecting the draw hook of the lifting ring 3 with a tensile machine through a steel wire rope, adhering a displacement measuring ball 6 to the bottom of the draw hook end of the lifting ring 3, connecting the displacement measuring ball 6 with a displacement sensor 7, arranging the displacement sensor 7 on a test bed, and recording the initial displacement value S1 of the displacement sensor 7 at the moment;
step three, the tensile machine exerts an acting force on the draw hook of the lifting ring 3 along the normal direction of the mounting surface of the wheel arch mounting hole 2, when the reading of the tensile machine reaches a preset value N, the acting force is stopped being exerted, and the current displacement value S2 of the displacement sensor 7 is recorded;
step four, gradually reducing the acting force of the tensile machine, and recording the current return displacement value S3 of the displacement sensor 7 when the reading of the acting force of the tensile machine is 0N;
and step five, calculating the local rigidity k of the wheel arch mounting hole 2 on the fender 1.
The purpose of the spacer 5 is to prevent the nut from causing local deformation and scratching of the wheel fender wheel arch mounting hole during tightening. The displacement measuring ball 6 is glued or otherwise glued in place at the bottom of the hook end of the suspension ring 3 (the place is near the mounting hole and not interfering with other equipment) and enables the attached displacement sensor 7 to be displaced in the force direction during measurement.
Further, the predetermined value N of the force applied by the tensile machine is the force applied by the maximum deformation amount specified for the wheel arch mounting hole 2 on the fender 1, and the displacement amount of the deformation of the wheel arch mounting hole 2 measured by the movement sensor 7 is the maximum displacement amount of the deformation of the wheel arch mounting hole 2 on the fender 1 under the force of the predetermined value N applied by the tensile machine (S2-S1).
Further, local rigidity k of wheel arch mounting hole 2 on fender 1 is: and k is N/(S2-S1).
Further, when the acting force applied by the tensile machine is gradually reduced from the predetermined value N to 0N, the displacement amount of the deformation of the wheel arch mounting hole 2 measured by the movement sensor 7 is the residual displacement amount of the deformation of the wheel arch mounting hole 2 on the fender 1 (S3-S1). Fender 1 goes up the residual displacement volume that wheel arch mounting hole 2 warp and can react the violence and dismantle the back, install the wheel arch again after, the gap of wheel arch and fender, this gap can directly influence the outward appearance to and influence customer experience and feel.
Further, when the pulling machine applies an acting force to the pulling hook of the lifting ring 3 along the normal direction of the mounting surface of the wheel arch mounting hole 2, a group of acting forces applied by the current pulling machine and displacement values measured by the corresponding displacement sensors 7 are recorded at intervals of 0.02s, and are derived into Excel to generate a force-displacement curve graph, as shown in fig. 8. The generated force-displacement curve graph is convenient for data analysis and test report composition.
The embodiment has the following beneficial effects:
(1) the local rigidity of the wheel fender upper wheel arch mounting hole position can be accurately obtained by measuring the maximum deformation amount of the wheel arch mounting hole deformation, and a test method capable of simulating the local deformation of the wheel fender upper wheel arch mounting hole position in the disassembling process is provided;
(2) by measuring the residual displacement of deformation of the wheel arch mounting hole on the fender, the gap between the wheel arch and the fender can be measured after the wheel arch is dismounted violently and mounted, so that a data basis is provided for structural optimization during structural design, and the gap caused by local deformation of the wheel arch mounting hole on the fender after the wheel arch is dismounted and mounted can be effectively avoided;
(3) whether impact force generated by disassembling the wheel trim possibly generated by a user in the process of using a vehicle can cause local deformation of the wheel trim mounting hole on the fender can be correctly simulated in the development stage, and a basis is provided for the design of the wheel trim mounting hole on the fender;
(4) the method can provide optimization suggestions for the design, and can effectively avoid the risks of surface difference and gaps between the fender and the wheel fender and even the risk of opening, trimming and corrosion of the fender caused by insufficient local rigidity of the wheel fender mounting hole in the process of using a vehicle by a user;
(5) the method can simply and quickly measure the local rigidity of the wheel arch mounting hole on the fender, and the device adopted during the measurement is simple and easy to obtain and has low cost;
(6) the method can be popularized to the use of measurement points such as the measurement of the local rigidity of the mounting point of the rear bumper on the side wall metal plate, the measurement of the local rigidity of the mounting point of the tail lamp on the side wall metal plate and the like, and the application range is wide;
(7) the measuring method is simple, the design is ingenious, and the effect is obvious;
(8) the measuring result has higher precision, strong credibility and strong practicability, and is suitable for large-scale popularization.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (5)
1. A method for measuring local rigidity of a wheel fender wheel arch mounting hole is characterized by comprising the following steps:
fixing a fender (1) to be tested on a test bed, installing a lifting ring (3) on a wheel arch mounting hole (2) of the fender (1), wherein the drag hook end of the lifting ring (3) is arranged on one side, facing the outside of the vehicle, of the fender (1), the lifting ring (3) is fixed by sleeving nuts (4) at the inner end and the outer end of the fender (1), and a gasket (5) is sleeved between the nuts (4) and the fender (1);
secondly, connecting the draw hook of the lifting ring (3) with a tensile machine through a steel wire rope, adhering a displacement measuring ball (6) to the bottom of the draw hook end of the lifting ring (3), connecting the displacement measuring ball (6) with a displacement sensor (7), arranging the displacement sensor (7) on a test bed, and recording the initial displacement value S1 of the displacement sensor (7);
step three, the tensile machine exerts an acting force on the draw hook of the lifting ring (3) along the normal direction of the mounting surface of the wheel arch mounting hole (2), when the reading of the tensile machine reaches a preset value N, the acting force is stopped being exerted, and the current displacement value S2 of the displacement sensor (7) is recorded;
step four, gradually reducing the acting force of the tensile machine, and recording the current return displacement value S3 of the displacement sensor (7) when the reading of the acting force of the tensile machine is 0N;
and fifthly, calculating the local rigidity k of the wheel arch mounting hole (2) on the fender (1).
2. A method of measuring a local stiffness of a fender wheel arch mounting hole according to claim 1, wherein the predetermined value N of the applied force by the tensile machine is an applied force of a maximum deformation amount specified for the wheel arch mounting hole (2) on the fender (1), and the displacement amount of the deformation of the wheel arch mounting hole (2) measured by the displacement sensor (7) is a maximum displacement amount (S2-S1) of the deformation of the wheel arch mounting hole (2) on the fender (1) under the applied force of the predetermined value N by the tensile machine.
3. A method of measuring a local stiffness of a fender wheel arch mounting hole according to claim 2, wherein the local stiffness k of the wheel arch mounting hole (2) on the fender (1) is: and k is N/(S2-S1).
4. A method of measuring a local rigidity of a fender wheel arch mounting hole according to claim 2, wherein when the force applied by the tensile machine is gradually reduced from a predetermined value N to 0N, the amount of displacement of deformation of the wheel arch mounting hole (2) measured by the displacement sensor (7) is the amount of residual displacement of deformation of the wheel arch mounting hole (2) on the fender (1) (S3-S1).
5. A method for measuring local rigidity of a fender wheel arch mounting hole according to claim 1, wherein when the pulling machine applies an acting force to the pulling hook of the lifting ring (3) along the normal direction of the mounting surface of the wheel arch mounting hole (2), a group of acting forces applied by the current pulling machine and displacement values measured by the corresponding displacement sensor (7) are recorded at intervals of 0.02s, and are derived into Excel to generate a force-displacement curve graph.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011002518.0A CN112197921A (en) | 2020-09-22 | 2020-09-22 | Method for measuring local rigidity of wheel fender wheel arch mounting hole |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011002518.0A CN112197921A (en) | 2020-09-22 | 2020-09-22 | Method for measuring local rigidity of wheel fender wheel arch mounting hole |
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| CN202011002518.0A Pending CN112197921A (en) | 2020-09-22 | 2020-09-22 | Method for measuring local rigidity of wheel fender wheel arch mounting hole |
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Cited By (1)
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| CN114322895A (en) * | 2021-12-01 | 2022-04-12 | 神龙汽车有限公司 | Tool and method for detecting difference between front wheel arch and rear wheel arch and vehicle door clearance surface |
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Application publication date: 20210108 |