CN112179673B - Vehicle door dynamic sealing failure reason identification method based on size chain decomposition - Google Patents
Vehicle door dynamic sealing failure reason identification method based on size chain decomposition Download PDFInfo
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- CN112179673B CN112179673B CN202010977227.7A CN202010977227A CN112179673B CN 112179673 B CN112179673 B CN 112179673B CN 202010977227 A CN202010977227 A CN 202010977227A CN 112179673 B CN112179673 B CN 112179673B
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J10/00—Sealing arrangements
- B60J10/80—Sealing arrangements specially adapted for opening panels, e.g. doors
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- G—PHYSICS
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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- G01B21/16—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring distance of clearance between spaced objects
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Abstract
The invention discloses a method for identifying reasons of failure of dynamic sealing of a vehicle door based on size chain decomposition, which comprises the following steps: the method comprises the steps of taking the static door inner gap allowance quantity of a control point obtained through static measurement, the dynamic door outer tensor of the control point obtained through dynamic measurement and the static door and vehicle body outer normal gap allowance quantity of the control point obtained through static measurement as a component ring, taking the door sealing strip compression reduction quantity at the position of the control point as a closed ring, establishing a size chain, obtaining a door sealing strip compression quantity design value at the position of the control point by establishing a normal section for the control point based on three-dimensional geometric data, judging the sealing state at the control point by comparing the door sealing strip compression reduction quantity with the door sealing strip compression quantity design value, and finally identifying the failure reason of dynamic sealing. The invention can identify the failure reason of the dynamic sealing of the vehicle door, further improve the structure of the vehicle door and fundamentally solve the problem of the failure of the dynamic sealing of the vehicle door.
Description
Technical Field
The invention belongs to the technical field of dynamic sealing of automobile doors, and particularly relates to a method for identifying failure reasons of dynamic sealing of an automobile door based on size chain decomposition.
Background
In the process of high-speed running of a vehicle, under the excitation of external air, the vehicle body is easy to open the vehicle door, so that the compression amount of a vehicle door sealing system is reduced or the sealing of the vehicle door sealing system fails, abnormal wind noise is caused, discomfort is brought to drivers and passengers, and therefore the problem of dynamic sealing is solved, and the great significance is brought to the improvement of the comfort of the whole vehicle.
In the prior art, solutions to the problem of dynamic sealing of a vehicle door are generally achieved by designing a dynamic sealing structure of a vehicle door, the designed dynamic sealing structure of the vehicle door is located between the vehicle door and a bottom plate, a bent portion extending outward is provided at a lower end of the vehicle door, a blocking portion extending upward is provided at an end of the bottom plate close to the vehicle door, an accommodating cavity is formed between the bent portion and the blocking portion, and the dynamic sealing structure includes: the sealing strip is provided with a clamping part and a main body, the clamping part is clamped on the blocking part, the main body is positioned in the accommodating cavity, a cavity is formed in the main body, the bottom plate is also provided with a control system for injecting air into the cavity when the vehicle door is closed, and the control system controls the cavity to deflate when the vehicle door is opened; when the vehicle door is not closed, no gas is filled in the cavity so as to facilitate the closing of the vehicle door, when the vehicle door is firmly clamped with the vehicle body, the control system starts to work, air is injected into the cavity to expand the main body, the contact area between the main body and the accommodating cavity is increased, and the noise entering amount outside the vehicle body is minimized; when the vehicle door is opened, the air in the cavity is exhausted, so that the vehicle door is closed next time.
Above-mentioned door dynamic seal structure has advantages such as structural design is reasonable, sealed effectual, however, in this structure, need dispose the control system who is used for injecting the air into the cavity for whole structure becomes complicated, and has increased whole structure's use and maintenance cost.
In the prior art, a technical scheme for identifying the dynamic sealing problem of the vehicle door is lacked, so that the problem of dynamic sealing of the vehicle door cannot be solved from the source of design and development.
Disclosure of Invention
Aiming at the defects in the prior art, the invention discloses a method for identifying the reasons of dynamic sealing failure of a vehicle door based on size chain decomposition, which can identify the reasons of dynamic sealing failure of the vehicle door, further improve the structure of the vehicle door and fundamentally solve the problem of dynamic sealing failure of the vehicle door. The technical scheme of the invention is as follows by combining the attached drawings of the specification:
the method for identifying the reason of the dynamic sealing failure of the vehicle door based on size chain decomposition comprises the following steps: the method comprises the steps of taking the static door inner gap allowance quantity of a control point obtained through static measurement, the dynamic door outer tensor of the control point obtained through dynamic measurement and the static door and vehicle body outer normal gap allowance quantity of the control point obtained through static measurement as a component ring, taking the door sealing strip compression reduction quantity at the position of the control point as a closed ring, establishing a size chain, obtaining a door sealing strip compression quantity design value at the position of the control point by establishing a normal section for the control point based on three-dimensional geometric data, judging the sealing state at the control point by comparing the door sealing strip compression reduction quantity with the door sealing strip compression quantity design value, and finally identifying the failure reason of dynamic sealing.
Further, the control point includes: the door inner clearance control point and the door and body outer control point.
Further, the process of the amount of the clearance overshoot in the control point static gate obtained by the static measurement is as follows:
removing the door opening sealing strip of the measured vehicle door, keeping the vehicle in a standing state, measuring and recording the static vehicle door internal clearance of the selected control point position through the door internal clearance measuring instrument, wherein the calculation formula of the static vehicle door internal clearance overmargin A1 is as follows:
a1= static door inner gap measurement-door inner gap design upper bias.
Further, the process of the dynamic extra-door tensor of the control point obtained by the dynamic measurement is as follows:
removing a door opening sealing strip of the measured vehicle door, installing an indoor gap measuring instrument at the selected control point position, controlling the vehicle to be in a high-speed running working condition of high-speed abnormal wind noise or dynamic sealing failure, measuring and recording the dynamic vehicle door inner gap at the selected control point position, wherein the calculation formula of the dynamic vehicle door outer tensor A2 is as follows:
a2= dynamic door clearance measurement-static door clearance measurement.
Further, in the process of the static door inner gap or the dynamic door inner gap, 4 to 5 control points that control the interval distribution of the paper sheet according to the size of the vehicle body are selected as single measurement control points.
Further, a specific process of the control point static door and vehicle body external normal clearance dispersion obtained through static measurement is as follows:
keeping the vehicle in a standing state, measuring and recording the normal clearance between the vehicle door and the outside of the vehicle body at the position of the selected control point through a wedge ruler, wherein the static vehicle door and the outside of the vehicle body have the following calculation formula of the exceeding quantity A3 of the normal clearance:
a3= door to body external normal clearance measurement-body external normal clearance design deviation.
Further, the size chain expression established at the control points is as follows:
A1 sinα+A2 sinα+A3＝A0
wherein: a1 is static door inner gap excess difference at a control point, A2 is dynamic door outer tensor at the control point, A3 is door and vehicle body outer normal gap excess difference at the control point, alpha is an included angle between a door and vehicle body outer normal direction at the control point and a Z direction, and A0 is door sealing strip compression reduction at the control point.
Further, the sealing state at the control point is specifically judged as follows:
when the reduction of the compression amount of the sealing strip at the control point is smaller than the design value of the compression amount of the sealing strip at the control point, judging that the sealing strip at the control point and the sealing strip-vehicle body contact surface are still in a sealing state;
and when the reduction of the compression amount of the sealing strip at the control point is greater than or equal to the design value of the compression amount of the sealing strip at the control point, judging that the sealing strip at the control point is separated from the sealing strip-vehicle body contact surface or is in a critical separation state, and dynamically sealing the position to fail.
Further, the dynamic seal failure causes include: the clearance in the door is out of tolerance, the dynamic door is outwards expanded, and the normal clearance between the door and the outside of the vehicle body is out of tolerance.
Further, before the identification method starts, a dynamic seal failure area is preliminarily locked in a mode of adhering adhesive tapes to the periphery of the vehicle body and the vehicle door, and then a control point is selected in the preliminarily locked dynamic seal failure area to identify the reason of the dynamic seal failure of the vehicle door.
Compared with the prior art, the invention has the beneficial effects that:
the method for identifying the reason for the failure of the dynamic seal of the vehicle door comprises the following steps: the size chain is established by dynamic sealing influence factors including the door inner gap allowance quantity, the dynamic door outer tensor and the door and body outer normal gap allowance quantity, the reason of dynamic sealing failure is decomposed and identified through the size chain, the reason of dynamic sealing failure existing in the door can be effectively identified, the door structure influencing dynamic sealing performance is improved, and finally the problem of dynamic sealing failure of the door is fundamentally solved.
Drawings
FIG. 1 is a block diagram of a flow chart of a method for identifying a cause of a dynamic seal failure of a vehicle door based on size chain decomposition according to the present invention;
FIG. 2 is a schematic diagram of the distribution of clearance control points in a door in a vehicle body dimension control map;
FIG. 3 is a schematic diagram showing the distribution of control points of the gap between the door and the outside of the vehicle body in the control diagram of the size of the vehicle body;
FIG. 4 is a schematic diagram of a normal cross-sectional position of a control point in the method for identifying a cause of a dynamic seal failure of a vehicle door according to the present invention;
FIG. 5 is a schematic diagram of a normal cross-sectional structure of a control point in the method for identifying the cause of failure of dynamic sealing of the vehicle door according to the present invention;
FIG. 6 is a schematic diagram of each ring in a dimensional chain established for a control point in the method for identifying the cause of dynamic seal failure of the vehicle door according to the present invention;
FIG. 7 is a schematic diagram of a dimension chain established for one control point in the method for identifying the cause of the dynamic sealing failure of the vehicle door according to the present invention;
fig. 8 is a schematic view of the compression amount of the door frame sealing strip for one control point in the method for identifying the reason for the dynamic sealing failure of the vehicle door.
Detailed Description
For clearly and completely describing the technical scheme and the specific working process thereof, the specific implementation mode of the invention is as follows by combining the attached drawings of the specification:
the invention discloses a method for identifying a reason for dynamic seal failure of a vehicle door based on size chain decomposition, which comprises the following steps: and establishing a dimension chain by using the dynamic sealing influence factors of the vehicle door including the internal gap excess quantity of the vehicle door, the external tensor of the dynamic vehicle door and the external normal gap excess quantity of the vehicle door and the vehicle body, and decomposing and identifying the reason of the dynamic sealing failure problem through the dimension chain.
As shown in fig. 1, the specific process of the method for identifying the cause of the dynamic seal failure of the vehicle door based on the size chain decomposition of the present invention is as follows:
step S1: statically measuring the clearance in the vehicle door to obtain the static door clearance allowance quantity A1;
the door inner gap is the normal direction clearance between door sealing strip mounted position and door opening sealing strip mounted position department door and the automobile body, and at the automobile product design stage, the control point position has been stipulated in the body size control drawing, the control point includes: "inner gap control point" and "outer control point of vehicle door and vehicle body"; wherein:
the positions and the number of the door inner gap control points of each automobile manufacturer are slightly different, as shown in fig. 2, in the present embodiment, the positions of the door inner gap control points specified in the body size control drawing are 24 positions, which are respectively distributed on the front door, and the positions include: 11 control points including control point A, control point B, control point C, control point D, control point E, control point F, control point G, control point H, control point J, control point K and control point L and distributed at the back door, including: a control point M, a control point N, a control point P, a control point Q, a control point R, a control point S, a control point T, a control point U, a control point V, a control point W, a control point X, a control point Y and a control point Z;
the positions and the number of the control points outside the vehicle door and the vehicle body of each automobile manufacturer are slightly different, as shown in fig. 3, in the present embodiment, the positions of the control points outside the vehicle door and the vehicle body, which are specified in the vehicle body size control drawing, are 25 in total, and are respectively: control point 1, control point 2, control point 3, control point 4, control point 5, control point 6, control point 7, control point 8, control point 9, control point 10, control point 11, control point 12, control point 13, control point 14, control point 15, control point 16, control point 17, control point 18, control point 19, control point 20, control point 21, control point 22, control point 23, control point 24, and control point 25;
meanwhile, the theoretical value and tolerance requirement of the door internal clearance in the white automobile body and the actual automobile are also specified in the automobile body dimension control drawing, and are used as the basis for the door internal clearance production and quality control in the white automobile body and the actual automobile of the sample automobile in a trial production stage, a small batch stage, a mass production stage and the like;
in the step S1, the internal clearance of the vehicle door is measured by an internal clearance measuring instrument, the internal clearance measuring instrument is composed of a magnetic attraction type sensor, a sensor gasket, a transmitter, a receiver, a calibration block and the like, when the internal clearance is measured, a door opening sealing strip needs to be removed, the magnetic attraction type sensor is fixed on a door opening metal plate through body magnetic attraction, after the vehicle door is closed, a pressing spring on the sensor is in contact with a vehicle door guard plate, the compression amount of the pressing spring is transmitted to a computer analysis measured value through an electric signal, and at present, mature products of the internal clearance measuring instrument in the market are applied to the development of vehicle products;
the static inner door clearance measuring process is as follows:
removing the door opening sealing strip of the measured door, keeping the vehicle in a standing state, and reducing the gap measurement junction in the door by the counter force of the pressure spring of the sensor of the door inner gap measuring instrumentThe influence of the effect, propose single measurement 4-5 control points, because window frame position panel beating rigidity generally is less than the door middle and lower part region, the control point of selection should be according to the vehicle body size control chart paper interval distribution, do not propose selecting window frame region or door middle and lower part region simultaneously, install door internal clearance measuring apparatu in each control point position of selection, measure and record the static door internal clearance of each control point position, the control point position static door internal clearance measured value that corresponds to door internal clearance control point one-to-one respectively is in proper order: a. The 1 、B 1 、C 1 、······X 1 、Y 1 、Z 1 (ii) a The measured value of the clearance in the static vehicle door corresponding to the one-to-one control point of the vehicle door and the external control point of the vehicle body is respectively as follows: 1 1 、2 1 、3 1 、······23 1 、24 1 、25 1 ；
The static door inner gap overshoot amount A1 is the difference between the static door inner gap measurement value and the design upper deviation of the door inner gap, namely:
a1= static door inner gap measurement-door inner gap design upper deviation
Wherein: the measured value of the static door inner clearance is obtained through the measurement in the process, the deviation of the design of the door inner clearance is obtained from a vehicle body size control drawing, and when A1 obtained through calculation is larger than 0, the static door inner clearance at the control point is represented to be out of tolerance;
taking the control point C as an example, the static door internal clearance overshoot A1 at the position of the control point C is the static door internal clearance measurement value C 1 Deviation C in gap design with gate 0max The difference, namely: a1= C 1 -C 0max When A1 > 0, it indicates that the static door inner clearance at the position of the control point C is out of tolerance.
Step S2: dynamically measuring the gap inside the vehicle door to obtain a dynamic tensor A2 outside the vehicle door;
removing the door opening sealing strip of the measured vehicle door, and suggesting 4-5 control points for single measurement in order to reduce the influence of the measurement result of the gap in the vehicle door by the pressed sheet spring reaction force of the sensor of the gap measuring instrument in the door, wherein the rigidity of the sheet metal at the position of the window frame is generally lower than that of the middle lower part area of the vehicle door, and the selected control points should be controlled according to the size of the vehicle bodyThe manufacturing paper is distributed at intervals, a window frame area or a vehicle door middle-lower area is not recommended to be selected at the same time, a door inner gap measuring instrument is installed at each selected control point position, the vehicle is in a high-speed running working condition of high-speed abnormal wind noise or dynamic sealing failure, the dynamic vehicle door inner gap of each control point position is measured and recorded, and the control point position dynamic vehicle door inner gap measuring values which are in one-to-one correspondence with the door inner gap control points are sequentially respectively: a. The 2 、B 2 、C 2 、······X 2 、Y 2 、Z 2 (ii) a The dynamic door inner gap measurement values of the control points corresponding to the door and the outer control points of the vehicle body one to one are respectively as follows: 1 2 、2 2 、3 2 、······23 2 、24 2 、25 2 ；
The dynamic door outer tensor A2 is equal to the difference between the dynamic door inner gap and the static door inner gap, namely:
a2= dynamic door clearance measurement-static door clearance measurement
The tensors outside the car door at the control point positions corresponding to the clearance control points inside the car door one to one are respectively as follows: a. The 2 -A 1 、B 2 -B 1 、C 2 -C 1 、······X 2 -X 1 、Y 2 -Y 1 、Z 2 -Z 1 (ii) a The dynamic car door outer tensors of the control point positions corresponding to the car door and the car body external control points one by one are respectively as follows: 1 2 -1 1 、2 2 -2 1 、3 2 -3 1 、······23 2 -23 1 、24 2 -24 1 、25 2 -25 1 。
And step S3: statically measuring the normal clearance between the vehicle door and the outside of the vehicle body to obtain the static clearance allowance quantity A3 of the vehicle door and the outside of the vehicle body;
the theoretical value and tolerance requirement of the normal clearance between the vehicle door and the outside of the vehicle body of each control point are specified in a vehicle body dimension control drawing, and the normal clearance between the vehicle door and the outside of the vehicle body of each control point in the vehicle body dimension control drawing is mainly decomposed into components in two directions including an X direction or a Z direction, wherein the normal clearance between the vehicle door and the outside of the vehicle body of a part of control points is mainly decomposed into components in the X direction according to different positions of the distribution of the control points, namely the components in the Z direction are basically zero; the normal clearance between the vehicle door and the outside of the vehicle body of the other part of the control points is mainly decomposed into a component in the Z direction, namely, the component in the X direction is basically zero; the normal clearance between the vehicle door and the outside of the vehicle body at a part of control points is decomposed into components in the X direction and the Z direction;
as shown in fig. 3, taking the door and body external control points as an example, the door and body external normal clearance between control point 1 and control point 2 vertically distributed right in front of the front door, and between control point 20 and control point 25 vertically distributed at the front door and rear door junction position is mainly decomposed into components in the X direction; the normal clearance between the vehicle door and the outside of the vehicle body, which is horizontally distributed from the control point 8 to the control point 12 at the top of the front vehicle door and the rear vehicle door, is mainly decomposed into a component in the Z direction; the normal gap between the door and the outside of the vehicle body from the control point 3 to the control point 8 distributed along the front door sash is decomposed into components in the X direction and the Z direction;
the common tool for measuring the normal clearance between the automobile door and the outer part of the automobile body in the production line of an automobile manufacturer is a wedge ruler which is used for judging whether the clearance is qualified or not;
the measurement process of the gap between the vehicle door and the outside of the vehicle body is as follows:
the vehicle is in a standing state, according to the requirements of vehicle body size control chart paper, wedge rulers are adopted to measure the normal clearance between the vehicle door and the outside of the vehicle body at each control point position respectively, and the measurement values of the normal clearance between the vehicle door and the outside of the vehicle body at the control point positions which are in one-to-one correspondence with the control points of the internal clearance of the door are respectively as follows: l is A 、L B 、L C 、···L X 、L Y 、L Z (ii) a The measured values of the normal clearance between the vehicle door and the outside of the vehicle body at the positions of the control points which are in one-to-one correspondence with the vehicle door and the outside control points of the vehicle body are respectively as follows: l is 1 、L 2 、L 3 、···L 23 、L 24 、L 25 ；
The static door and outside vehicle body normal clearance overlength amount A3 is the difference between the measured value of the door and outside vehicle body normal clearance and the design upper deviation of the door and outside vehicle body normal clearance, namely:
a3= measured value of normal clearance between door and outside of vehicle body-deviation in design of normal clearance outside of vehicle body
Wherein: the measured value of the normal clearance between the vehicle door and the outside of the vehicle body is obtained through the measurement in the process, the deviation in the design of the normal clearance between the vehicle door and the outside of the vehicle body is obtained from a vehicle body dimension control drawing, and when A3 obtained through calculation is larger than 0, the out-of-tolerance of the normal clearance between the vehicle door and the outside of the vehicle body at the control point is represented;
taking the control point C as an example, the door-to-body external normal clearance allowance A3 at the control point C position is taken as the door-to-body external normal clearance measurement value L at the control point C position C Deviation L from design of normal clearance between the vehicle door and the outside of the vehicle body at the position of the control point C 0max The difference, namely: a3= Lc-L 0max When A3 is larger than 0, the out-of-tolerance of the normal clearance between the vehicle door and the outside of the vehicle body at the position of the control point C is represented;
in addition, the sinking of the door is one of the main factors causing the dynamic sealing failure of the door, the sinking amount of the door is the projection component of the door of the control point and the normal gap outside the vehicle body in the Z direction, the sinking of the door of the front door has different degrees of influence on the normal gaps of the door and the vehicle body at the positions from the control point 1 to the control point 8 distributed on the left front door, taking the control point 5 as an example, assuming that the included angle between the normal gap and the Z direction is α, and the relation between the sinking amount of the door M at the control point 5 and the normal gap between the door at the control point 5 and the normal gap outside the vehicle body L5 is: m = L5 × cos α.
And step S4: taking the static inner gap allowance quantity A1, the dynamic outer door tensor A2 and the normal gap allowance quantity A3 between the door and the outer part of the vehicle body as forming rings, and taking the compression quantity reduction quantity A0 of the door sealing strip as a closed ring to establish a dimension chain;
the static door inner gap excess difference, the dynamic door outer tensor and the vehicle body outer normal gap excess difference lead to the reduction of the compression amount of the door sealing strip or the door opening sealing strip, the size chain is established by taking the compression amount failure of the door sealing strip as an example, the static door inner gap excess difference A1, the dynamic door outer tensor A2 and the vehicle body outer normal gap excess difference A3 are taken as the component rings in the size chain, the reduction of the compression amount of the door sealing strip A0 is taken as the closed ring of the size chain, and under the condition that other rings are not changed, along with the size increase of each component ring, the size of the closed ring is increased, and the method comprises the following steps: the component rings including the static inner gap allowance quantity A1, the dynamic outer door tensor A2 and the outer normal gap allowance quantity A3 of the vehicle door and the vehicle body are increased rings;
because a plurality of control points are specified in a vehicle body dimension control drawing, a dimension chain can be established for a static door inner gap excess quantity A1, a dynamic door outer tensor A2, a vehicle door and vehicle body outer normal gap excess quantity A3 and a vehicle door sealing strip compression quantity reduction quantity A0 corresponding to each control point, and the dimension chains established correspondingly by different control points form a group of dimension chain data;
as shown in fig. 4, 5, 6, and 7, taking a control point C located at the left front door sash position in the car body dimension control drawing as an example, the door frame weather strip b is located at a position between the car body a and the front side window C, a contact surface d is formed between the door frame weather strip b and the car body a, and a dimension chain establishing process at the position of the door frame weather strip b is as follows:
as shown in fig. 6 and 7, the size chain expression established by the control point C is:
A1 sinα+A2 sinα+A3＝A0
wherein A1 is static door inner gap excess difference at the control point C, A1= C 1 -C 0max A2 is the dynamic extra-door tensor at control point C, A2= C 2 -C 1 The A3 is the amount of the over-tolerance between the vehicle door and the external normal clearance of the vehicle body at the control point C, and the A0 is the amount of the reduction of the compression amount of the vehicle door sealing strip at the control point C, so that the size chain expression established by the control point C is as follows:
(C 1 -C 0max )sinα+(C 2 -C 1 )sinα+(Lc-L 0max )＝A0
wherein, C 1 Is a static door inner clearance measurement value at a control point C, C 0max Designing upper deviation for the inner clearance of the door at the control point C, wherein alpha is the included angle between the normal direction of the door at the control point C and the outer part of the vehicle body and the Z direction (namely the vertical direction), and C 2 Is the measured value of the inner clearance of the dynamic door at the control point C, lc is the measured value of the normal clearance between the door and the outer part of the vehicle body at the control point C, and L 0max For the vehicle door at the control point CDeviation from the design of the normal clearance outside the vehicle body.
Step S5: establishing a normal section for each control point according to the three-dimensional geometric data, and calculating a design value of the normal compression amount of the sealing strip;
according to the three-dimensional geometric data, normal sections are established at the positions of all control points, the two-dimensional normal sections are led into special commercial software to calculate the design value of the compression amount of the sealing strip, and the measured values of the normal clearances between the vehicle door and the outside of the vehicle body at the positions of the control points which are in one-to-one correspondence with the clearance control points in the door are respectively as follows: a. The design 、B design 、C design 、···X design 、Y design 、Z design (ii) a The measured values of the normal clearances between the vehicle door and the outside of the vehicle body at the positions of the control points which are in one-to-one correspondence with the vehicle door and the outside control points of the vehicle body are respectively as follows: 1 design 、2 design 、3 design 、···23 design 、24 design 、25 design ；
Taking the control point C as an example, establishing a normal section at the position of the control point C according to the three-dimensional set data, importing the two-dimensional normal section established at the position of the control point C into special commercial software, and calculating to obtain a normal design value C of the compression amount of the sealing strip at the position of the control point C design 。
Step S6: analyzing the size chain established in the step S4, and identifying the reason of the dynamic seal failure;
the size chain analysis process is specifically as follows:
when the seal strip compression amount reduction A0 of the control point of the dimension chain closed ring is smaller than the design value of the seal strip compression amount of the control point, the seal strip compression amount h is as shown in FIG. 8, the seal strip at the control point and the seal strip-vehicle body contact surface are still in a sealing state, and conversely, when the seal strip compression amount reduction A0 of the control point of the dimension chain closed ring is larger than or equal to the design value of the seal strip compression amount of the control point, the seal strip at the control point and the seal strip-vehicle body contact surface are separated or in a critical separation state, the position dynamic seal fails, and external noise sources such as wind noise and the like leak into the vehicle from the control point.
Take control point C as an example, when A0 < C at control point C design If so, judging that the sealing strip at the control point C and the sealing strip-vehicle body contact surface are still in a sealing state; when A0 at the control point C is more than or equal to C design When the sealing strip is in a critical disconnection state, the dynamic sealing at the position is failed, and external noise sources such as wind noise and the like are leaked from the control point C into the vehicle;
the dynamic seal failure reason identification process specifically comprises the following steps:
aiming at the dynamic sealing problem, the method comprises the following steps: and three dynamic sealing failure reasons including the out-of-tolerance of the internal clearance of the door, the outward expansion of the dynamic vehicle door and the out-of-normal clearance of the vehicle door and the vehicle body are started, and the dynamic sealing failure reasons are identified.
Based on the identification method for the reason of the dynamic sealing failure of the vehicle door, because the number of the specified control points of the vehicle door and the vehicle body is large in the vehicle body dimension control drawing, in order to reduce the workload and improve the efficiency, the dynamic sealing failure area, such as a front vehicle door or a rear vehicle door, a vehicle door sash area or a vehicle door lower area, is primarily locked by means of adhering adhesive tapes on the periphery of the vehicle body and the vehicle door, and then the locked area is identified according to the identification method for the reason of the dynamic sealing failure of the vehicle door.
For example, when the real vehicle is driven at a speed of 100km/h or more, the driver senses abnormal wind noise, even leakage and the like, which is a typical dynamic sealing failure problem, and part of the vehicle door sealing system is separated from the contact surface, and the sealing effect is lost. After the adhesive tape with fixing and sealing functions is adhered to the gap position between the middle-lower part area of the vehicle door and the vehicle body, abnormal wind noise still exists, and the dynamic sealing failure area can exclude the lower part area of the vehicle door; after the gap between the door sash and the vehicle body is sealed by the adhesive tape, abnormal wind noise disappears, so that the position with the problem of dynamic sealing is locked in the front door sash area;
as shown in fig. 2 and 3, the control points of the position of the front door sash in the body size control diagram include: the method comprises the following steps that a size chain is respectively established at a control point of a window frame position by a control point 4, a control point 5, a control point 6, a control point 7 and a control point 8 in a door inner gap control point, and a control point C, a control point D and a control point E in a door and vehicle body outer control point, the numerical value of a closed ring of the size chain is compared with the design value of the compression amount of a sealing strip, whether the dynamic seal of the corresponding control point position fails or not is judged, and the size chain data at the control point of the front door and window frame position is shown as the following table I:
watch 1
As shown in the first table, the door dynamic seal failure area in the front door window frame area is the positions of a control point D, a control point 6 and a control point 7, wherein the large external tension of the door and the out-of-tolerance of the door and the vehicle body are main reasons causing the door dynamic seal failure; the problem of large outer tension of the dynamic car door, which causes dynamic sealing failure of the car door, is solved by strengthening the rigidity of the window frame from a design angle, reasonably arranging car door hinges in a way of benchmarking and the like aiming at the parts with large outer tension of the dynamic car door, which are mainly related to the rigidity of the window frame, the arrangement of the car door hinges and the like; aiming at the out-of-tolerance of the normal clearance between the vehicle door and the outside of the vehicle body, which is mainly related to the assembly state of the vehicle door or related to the sinking of the vehicle door caused by the deformation of the vehicle door, the problem of the out-of-tolerance of the normal clearance between the vehicle door and the outside of the vehicle body, which causes the dynamic sealing failure of the vehicle door, is solved in a targeted way from the directions of adjusting the assembly of the vehicle door, optimizing the structural shape design of the vehicle door and the like.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A method for identifying the reason of the failure of dynamic sealing of a vehicle door based on size chain decomposition is characterized by comprising the following steps:
the identification method comprises the following steps: taking the static door internal gap excess difference of the control point obtained through static measurement, the dynamic door external gap excess difference of the control point obtained through dynamic measurement and the static door and vehicle body external normal gap excess difference of the control point obtained through static measurement as a component ring, taking the door sealing strip compression reduction at the control point position as a closed ring, establishing a size chain, obtaining a door sealing strip compression design value at the control point position by establishing a normal cross section for the control point based on three-dimensional geometric data, judging the sealing state at the control point by comparing the door sealing strip compression reduction with the door sealing strip compression design value, and finally identifying the failure reason of dynamic sealing;
the size chain expression established at the control points is as follows:
A1sinα+A2sinα+A3＝A0
wherein: a1 is static door inner gap excess difference quantity at a control point, A2 is dynamic door outer gap excess quantity at the control point, A3 is door and vehicle body outer normal gap excess quantity at the control point, alpha is an included angle between a vehicle door and vehicle body outer normal direction at the control point and the vertical direction, and A0 is vehicle door sealing strip compression quantity reduction quantity at the control point.
2. The method for identifying the cause of the failure of the dynamic seal of the vehicle door based on the size chain decomposition as claimed in claim 1, wherein:
the control point includes: the door inner gap control point and the door and body outer control point.
3. The method for identifying the cause of the dynamic seal failure of the vehicle door based on the size chain decomposition as claimed in claim 1, wherein:
the process of the control point static door internal clearance overshoot amount obtained by the static measurement is as follows:
removing the door opening sealing strip of the measured vehicle door, keeping the vehicle in a standing state, measuring and recording the static vehicle door internal clearance of the selected control point position through the door internal clearance measuring instrument, wherein the calculation formula of the static vehicle door internal clearance overmargin A1 is as follows:
a1= static door inner gap measurement-door inner gap design upper bias.
4. The method for identifying the cause of the failure of the dynamic seal of the vehicle door based on the size chain decomposition as claimed in claim 3, wherein:
the process of the dynamic extra-door tensor of the control point obtained by dynamic measurement is as follows:
removing a door opening sealing strip of the measured vehicle door, installing an indoor gap measuring instrument at the selected control point position, controlling the vehicle to be in a high-speed running working condition of high-speed abnormal wind noise or dynamic sealing failure, measuring and recording the dynamic vehicle door inner gap at the selected control point position, wherein the calculation formula of the dynamic vehicle door outer tensor A2 is as follows:
a2= dynamic door clearance measurement-static door clearance measurement.
5. The method for identifying the cause of the failure of the dynamic seal of the vehicle door based on the size chain decomposition as claimed in claim 3 or 4, wherein:
in the process of the static vehicle door inner gap or the dynamic vehicle door inner gap, 4 to 5 control points which control the interval distribution of the paper according to the size of the vehicle body are selected as single measurement control points.
6. The method for identifying the cause of the dynamic seal failure of the vehicle door based on the size chain decomposition as claimed in claim 1, wherein:
the specific process of the control point static door and vehicle body external normal clearance overmargin amount obtained through static measurement is as follows:
keeping the vehicle in a standing state, measuring and recording the normal clearance between the vehicle door and the outside of the vehicle body at the position of the selected control point through a wedge ruler, wherein the static vehicle door and the outside of the vehicle body have the following calculation formula of the exceeding quantity A3 of the normal clearance:
a3= measured value of the vehicle door-vehicle body external normal clearance-deviation in design of the vehicle body external normal clearance.
7. The method for identifying the cause of the failure of the dynamic seal of the vehicle door based on the size chain decomposition as claimed in claim 1, wherein:
the sealing state at the control point is judged specifically as follows:
when the reduction of the compression amount of the sealing strip at the control point is smaller than the design value of the compression amount of the sealing strip at the control point, judging that the sealing strip at the control point and the sealing strip-vehicle body contact surface are still in a sealing state;
and when the reduction of the compression amount of the sealing strip at the control point is greater than or equal to the design value of the compression amount of the sealing strip at the control point, judging that the sealing strip at the control point is separated from the sealing strip-vehicle body contact surface or is in a critical separation state, and dynamically sealing the position to fail.
8. The method for identifying the cause of the dynamic seal failure of the vehicle door based on the size chain decomposition as claimed in claim 1, wherein:
the dynamic seal failure causes include: the door internal clearance out-of-tolerance, dynamic door external expansion and the door and the external normal clearance out-of-tolerance of the vehicle body.
9. The method for identifying the cause of the dynamic seal failure of the vehicle door based on the size chain decomposition as claimed in claim 1, wherein:
before the identification method is started, a dynamic seal failure area is preliminarily locked in a mode of pasting an adhesive tape on the periphery of a vehicle body and a vehicle door, and then a control point is selected in the preliminarily locked dynamic seal failure area to identify the reason of the dynamic seal failure of the vehicle door.
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