CN111914343B - Method capable of accurately determining parting limit boundary line of automobile opening and closing part - Google Patents
Method capable of accurately determining parting limit boundary line of automobile opening and closing part Download PDFInfo
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- CN111914343B CN111914343B CN202010531031.5A CN202010531031A CN111914343B CN 111914343 B CN111914343 B CN 111914343B CN 202010531031 A CN202010531031 A CN 202010531031A CN 111914343 B CN111914343 B CN 111914343B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000013461 design Methods 0.000 claims abstract description 13
- 238000013459 approach Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 abstract description 4
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- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013524 data verification Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F2111/04—Constraint-based CAD
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/28—Fuselage, exterior or interior
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/20—Design reuse, reusability analysis or reusability optimisation
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Abstract
The invention discloses a method capable of accurately determining a parting limit boundary line of an automobile opening and closing part, which comprises the following steps: s1, determining key parameters, wherein the key parameters comprise a DTS clearance d, an included angle theta between a parting trend and a hinge axis and a section clearance d1, and the relation is d1=d/cos (theta); s2, preliminarily arranging the hinge positions according to the modeling surface CAS, the environment BODY and the like, and determining the hinge axis; s3, at the key position 1, making a plane A perpendicular to the hinge axis and an intersection point Q1 between the plane A and the hinge axis; s4, designing a section of the key position 1 according to the plane A1 and the reference of the intersection point Q1; s5, generating a front cover limit boundary point P1 according to the section sketch constraint, and analogizing to make a plurality of key position limit boundary points P2 and P3. According to the invention, the problem of large Lold error of the limit boundary line in the prior art can be solved by introducing the included angle theta parameter and the clearance relation in the critical position section design, and the front cover parting optimization effect is particularly outstanding.
Description
Technical Field
The invention relates to the technical field of parting limit boundary lines of automobile opening and closing parts, in particular to a method capable of accurately determining the parting limit boundary lines of the automobile opening and closing parts.
Background
When an automobile opening and closing member engineer performs hinge arrangement of the opening and closing member, in order to meet the requirement of movement clearance between the opening and closing member and the environmental member, the adjustable region S of the parting theory needs to be analyzed so as to ensure that the parting arrangement meets the requirement of movement clearance between the opening and closing member and the environmental member. In order to make the automobile model meet engineering requirements, an automobile opening and closing member engineer provides a parting limit boundary line L (or a parting theory adjustable region S) for the automobile engineer, and the automobile engineer performs parting optimization according to the parting limit boundary line L. The design method of the parting limit boundary line L (or the parting theory adjustable region S) is generally as follows: and designing corresponding parting limit boundary points P by adopting a plurality of key position sections, wherein connecting lines of the limit boundary points P are parting limit boundary lines L.
In the prior art, a design of a parting limit boundary line Lold (or a parting theory adjustable region Sold) has a large error, and a problem of a front cover parting position is prominent (when the front cover parting is arranged, the front cover parting exceeds the front cover limit boundary line Lold, 3D data verification is carried out, and the front cover parting still meets the requirement of a movement gap). The error is too large, leading to the following adverse consequences: 1. the error is large, the parting limit boundary line Lold (or the parting theory adjustable region Sold) is invalid, the parting arrangement is not based, a large amount of 3D data is required to be repeatedly verified, and the workload is increased; 2. the gap limit boundary line Lold error is large, so that the gap theory adjustable region Sold is generally reduced, and the gap adjustment degree of freedom of the automobile model is reduced; 3. the error is large, resulting in an extended design cycle and reduced design reliability.
Disclosure of Invention
1. Aiming at the defects existing in the prior art, the invention aims to provide a method capable of accurately determining the parting limit boundary line of an automobile opening and closing part, and the problem of large Lold error of the limiting boundary line in the prior art can be solved by introducing an included angle theta parameter and a clearance relation in the design of a cross section at a key position, so that the parting optimization effect of a front cover is particularly remarkable. To achieve the above objects and other advantages and in accordance with the purpose of the present invention, there is provided a method for precisely determining a parting limit boundary line of an opening and closing member of an automobile, comprising the steps of:
S1, determining key parameters, wherein the key parameters comprise a DTS clearance d, an included angle theta between a parting trend and a hinge axis and a section clearance d1, and the relation is d1=d/cos (theta);
s2, preliminarily arranging the hinge positions according to the modeling surface CAS, the environment BODY and the like, and determining the hinge axis;
S3, at the key position 1, making a plane A perpendicular to the hinge axis and an intersection point Q1 between the plane A and the hinge axis;
S4, carrying out cross section design of the key position 1 by taking the plane A1 and the intersection point Q1 as references;
S5, generating a front cover limit boundary point P1 according to the constraint of the section sketch, and analogizing to make key position limit boundary points P2 and P3;
s6, obtaining a motion limit boundary line Lnew according to the connection of a plurality of key position limit boundary points;
S7, arranging front cover parting lines according to the parting trend of the set parameters and the included angle theta of the hinge axis, enabling the front cover parting lines to approach a movement limit boundary Lnew, and further designing a front cover and fender local structure;
and S8, performing 3D data motion check.
Preferably, the key parameters in step S1 further include a general operating condition minimum movement gap NMDmin, a limit operating condition minimum movement gap ULDmin, an opening angle β, a limit operating condition offset Px, and a limit operating condition offset Pz.
Preferably, in the section, one of the normal condition minimum movement gap NMDmin and the limit condition minimum movement gap ULDmin is set as a reference value, and the other is a constraint value, and the following principle is followed:
principle 01: defining a value uld= ULDmin, at which time the reference value UMD is greater than or equal to NMDmin;
principle 02: defining a value nmd= NMDmin, at which point the reference value ULD is > ULDmin, wherein: general operating mode movement gap NMD, general operating mode minimum movement gap NMDmin, limit operating mode movement gap ULD, limit operating mode minimum movement gap ULDmin.
Preferably, the 3D data motion check in step S8 includes a 3D data general condition motion check, a 3D data limit condition motion check, and a 3D data motion check.
Preferably, the 3D data general-condition motion check includes rotating the front cover partial structure according to a set opening angle β, generating a front cover general-condition motion envelope, and measuring a gap between the front cover general-condition motion envelope and the fender partial structure.
Preferably, the 3D data limit condition movement check includes shifting the front cover partial structure according to the limit condition offset Px and the limit condition offset Pz, rotating the front cover partial structure according to the set opening angle β, generating a front cover limit condition movement envelope, and measuring a gap between the front cover partial structure and the fender partial structure.
Preferably, the 3D data motion check includes that the designed parting limit boundary line Lnew is valid through the 3D data motion check.
Compared with the prior art, the invention has the beneficial effects that:
1. The precision of the parting limit boundary line Lnew is high, the parting limit boundary line Lnew (or the parting theory adjustable region Snnew) is effective, the parting arrangement is provided with a basis, a large amount of 3D data is not required to be verified repeatedly, and the workload is greatly reduced;
2. the precision of the parting limit boundary line Lnew is high, so that the parting theoretical adjustable region Snew is close to the actual adjustable region, and the degree of freedom of the parting adjustment of the automobile model is not reduced manually;
3. the parting limit boundary precision is improved, so that the design period is shortened, and the design reliability is improved.
4. By introducing an included angle theta parameter and a clearance relation in the critical position section design, d1=d/cos (theta), the problem of large Lold error of a limiting boundary line in the prior art can be solved, and the front cover parting optimization effect is particularly remarkable.
Drawings
FIG. 1 is a prior art slit limit boundary Lold error plot of a method for accurately determining a slit limit boundary line of an automotive opening and closing member in accordance with the present invention;
FIG. 2 is a schematic view of a clearance relationship of a positioning button of a method for precisely determining a parting limit boundary line of an automobile opening and closing member according to the present invention;
FIG. 3 is a schematic diagram of key elements of a cross-sectional design of a method for precisely determining parting limit boundary lines of an automobile opening and closing member according to the present invention;
fig. 4 is a schematic view of a general operating mode movement gap NMD and a limit operating mode movement gap ULD of a method for precisely determining a parting limit boundary line of an automobile opening and closing member according to the present invention;
FIG. 5 is a schematic view of a front cover limit boundary line generated by connecting a plurality of front cover limit boundary points according to the method for precisely determining the parting limit boundary line of an automobile opening and closing part;
FIG. 6 is a schematic view of a front cover seam approaching the front cover limit boundary line of a method for precisely determining the seam limit boundary line of an automobile opening and closing member according to the present invention;
fig. 7 is a schematic diagram of a prior art method for precisely determining a parting limit boundary line of an automobile opening and closing member and a boundary difference value obtained by the prior art method according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-7, a method for precisely determining a parting limit boundary line of an automobile opening and closing member includes the steps of:
S1, determining key parameters, wherein the key parameters comprise a DTS clearance D, an included angle theta of a parting trend and a hinge axis and a section clearance D1, the relation is d1=d/cos (theta), the DTS clearance D is a clearance between 3D adjacent parts and is generally the minimum distance between the adjacent parts, the section clearance D1 is in a parting plane A, the minimum distance between the adjacent parts is in the parting plane A, the parting plane A is perpendicular to a rotation center line, and the relation between the DTS clearance D, the included angle theta of the parting trend and the hinge axis and the section clearance D1 is d1=d/cos (theta), so that when the included angle theta of the parting trend and the hinge axis is larger, the section clearance D1 and the DTS clearance D are larger;
s2, preliminarily arranging the hinge positions according to the modeling surface CAS, the environment BODY and the like, and determining the hinge axis;
S3, at the key position 1, making a plane A perpendicular to the hinge axis and an intersection point Q1 between the plane A and the hinge axis;
S4, carrying out cross section design of the key position 1 by taking the plane A1 and the intersection point Q1 as references;
S5, generating a front cover limit boundary point P1 according to the constraint of the section sketch, and analogizing to make key position limit boundary points P2 and P3;
s6, obtaining a motion limit boundary line Lnew according to the connection of a plurality of key position limit boundary points;
S7, arranging front cover parting lines according to the parting trend of the set parameters and the included angle theta of the hinge axis, enabling the front cover parting lines to approach a movement limit boundary Lnew, and further designing a front cover and fender local structure;
and S8, performing 3D data motion check.
Further, the key parameters in the step S1 further include a general working condition minimum movement gap NMDmin, a limit working condition minimum movement gap ULDmin, an opening angle β, a limit working condition offset Px, and a limit working condition offset Pz.
Further, in the section, one of the general working condition minimum movement gap NMDmin and the limit working condition minimum movement gap ULDmin is set as a reference value, and the other is a constraint value, and the following principle is followed:
principle 01: defining a value uld= ULDmin, at which time the reference value UMD is greater than or equal to NMDmin;
principle 02: defining a value nmd= NMDmin, at which point the reference value ULD is > ULDmin, wherein: general operating mode movement gap NMD, general operating mode minimum movement gap NMDmin, limit operating mode movement gap ULD, limit operating mode minimum movement gap ULDmin.
Further, the 3D data motion check in step S8 includes 3D data general condition motion check, 3D data limit condition motion check, and 3D data motion check.
Further, the 3D data general working condition movement check comprises the steps of rotating the front cover partial structure according to a set opening angle beta, generating a front cover general working condition movement envelope, and measuring a gap between the front cover general working condition movement envelope and the fender partial structure.
Further, the 3D data limit working condition movement check comprises shifting the front cover partial structure according to the limit working condition offset Px and the limit working condition offset Pz, rotating the front cover partial structure according to the set opening angle beta, generating a front cover limit working condition movement envelope, and measuring the gap between the front cover and the fender partial structure.
Further, the 3D data motion check includes that the designed parting limit boundary line Lnew is valid through the 3D data motion check.
The number of devices and the scale of processing described herein are intended to simplify the description of the invention, and applications, modifications and variations of the invention will be apparent to those skilled in the art.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (7)
1. The method capable of accurately determining the parting limit boundary line of the automobile opening and closing part is characterized by comprising the following steps of:
S1, determining key parameters, wherein the key parameters comprise a DTS clearance d, an included angle theta between a parting trend and a hinge axis and a section clearance d1, and the relation is d1=d/cos (theta);
S2, preliminarily arranging the hinge positions according to the modeling surface CAS and the environment BODY, and determining the hinge axis;
S3, at the key position 1, making a plane A perpendicular to the hinge axis and an intersection point Q1 between the plane A and the hinge axis;
S4, carrying out cross section design of the key position 1 by taking the plane A and the intersection point Q1 as references;
S5, generating a front cover limit boundary point P1 according to the constraint of the section sketch, and analogizing to make key position limit boundary points P2 and P3;
S6, obtaining a motion limit boundary line Lnew according to the connection of the limit boundary points of the key positions;
S7, arranging front cover parting lines according to the parting trend of the set parameters and the included angle theta of the hinge axis, enabling the front cover parting lines to approach a movement limit boundary Lnew, and further designing a front cover and fender local structure;
and S8, performing 3D data motion check.
2. The method of claim 1, wherein the key parameters in the step S1 further include a general operating mode minimum movement gap NMDmin, a limit operating mode minimum movement gap ULDmin, an opening angle β, a limit operating mode offset Px, and a limit operating mode offset Pz.
3. The method for precisely determining the parting limit boundary line of the opening and closing member of the automobile according to claim 2, wherein one of the normal condition minimum movement gap NMDmin and the limit condition minimum movement gap ULDmin is set as a reference value and the other is set as a constraint value in the section, and the following principle is followed:
principle 01: defining a value uld= ULDmin, at which time the reference value UMD is greater than or equal to NMDmin;
principle 02: defining a value nmd= NMDmin, at which point the reference value ULD is > ULDmin, wherein: general operating mode movement gap NMD, general operating mode minimum movement gap NMDmin, limit operating mode movement gap ULD, limit operating mode minimum movement gap ULDmin.
4. The method for precisely determining the parting limit boundary line of the opening and closing member of the automobile according to claim 1, wherein the 3D data motion check in the step S8 includes a 3D data general condition motion check, a 3D data limit condition motion check and a 3D data motion check.
5. The method for precisely determining the parting limit boundary line of the opening and closing member of the automobile according to claim 4, wherein the 3D data general working condition movement check comprises the steps of rotating the front cover partial structure according to a set opening angle beta, generating a front cover general working condition movement envelope, and measuring the clearance between the front cover general working condition movement envelope and the fender partial structure.
6. The method for precisely determining the parting limit boundary line of the automobile opening and closing part according to claim 4, wherein the 3D data limit working condition movement check comprises shifting the front cover partial structure according to a limit working condition shift amount Px and a limit working condition shift amount Pz, rotating the front cover partial structure according to a set opening angle beta, generating a front cover limit working condition movement envelope, and measuring a gap between the front cover partial structure and a fender partial structure.
7. The method for precisely determining the parting limit boundary line of the opening and closing member of the automobile according to claim 4, wherein the 3D data motion check comprises the 3D data motion check, and the designed parting limit boundary line Lnew is valid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010531031.5A CN111914343B (en) | 2020-06-11 | 2020-06-11 | Method capable of accurately determining parting limit boundary line of automobile opening and closing part |
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| CN202010531031.5A CN111914343B (en) | 2020-06-11 | 2020-06-11 | Method capable of accurately determining parting limit boundary line of automobile opening and closing part |
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| CN111914343A CN111914343A (en) | 2020-11-10 |
| CN111914343B true CN111914343B (en) | 2024-05-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115114720B (en) * | 2022-06-01 | 2024-04-26 | 合众新能源汽车股份有限公司 | Solving method and device for parting line range of vehicle door |
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| CN108058581A (en) * | 2017-12-18 | 2018-05-22 | 北斗航天汽车（北京）有限公司 | The check method of car door parting and research of door design method |
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2020
- 2020-06-11 CN CN202010531031.5A patent/CN111914343B/en active Active
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| CN106080786A (en) * | 2016-08-10 | 2016-11-09 | 阿尔特汽车技术股份有限公司 | Vehicle side-wall outer-plate A post and beater or beat-up fit structure |
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