CN108230446A - A kind of high-precision three-dimensional curved surface modeling method - Google Patents
A kind of high-precision three-dimensional curved surface modeling method Download PDFInfo
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Abstract
The invention discloses a kind of high-precision three-dimensional curved surface modeling methods, this method is handled by analytic surface data, and to curved surface data, and data are converted into the data set that can be used for modeling, 3 d modeling software builds high-precision three-dimensional curved surface according to data set, realizes three-dimension curved surface modeling.The method of the present invention is simple, and master pattern can be provided for the establishment of three-dimensional modeling program when building three-dimension curved surface, not only reduces the quantity of point data importing, simplifies modelling operability, and the precision modeled is higher, the three-dimension curved surface of structure can independently be changed.
Description
Technical field
The present invention relates to a kind of three-dimension curved surface modeling technique, particularly a kind of high-precision three-dimensional curved surface modeling method.
Background technology
Three-dimension curved surface class part is widely used in the industries such as aerospace, high-speed railway, engineering in medicine, modern architecture,
Many military or civilian major projects and engineering are required for coming by unique contoured of high-precision three-dimensional curved surface class part
Realize certain function.Traditional modeling method needs to import a large amount of point datas in modeling, is susceptible to mistake, causes to model
Inaccuracy, the precision of modeling is relatively low, while the three-dimension curved surface built is difficult to change, and leads to cumbersome, the modeling efficiency of modeling
It is relatively low.
Invention content
The object of the present invention is to provide a kind of high-precision three-dimensional curved surface modeling methods.The method of the present invention is simple, in structure
Master pattern can be provided for the establishment of three-dimensional modeling program when building three-dimension curved surface, not only reduce the quantity of point data importing, letter
Modelling operability is changed, and the precision modeled is higher, the three-dimension curved surface of structure can independently be changed.
Technical scheme of the present invention：A kind of high-precision three-dimensional curved surface modeling method, this method be by analytic surface data,
And curved surface data is handled, data are converted into the data set that can be used for modeling, 3 d modeling software is according to data set
High-precision three-dimensional curved surface is built, realizes three-dimension curved surface modeling.
In a kind of aforementioned high-precision three-dimensional curved surface modeling method, the method be by analytic surface data, and will
Polar angle, polar radius data point are converted into X, Y coordinate form, by the spot projection of polar form to rectangular coordinate system X and Y-axis, adopt
Data point is handled with formula Xn=Cn*COS (An*PI ()/180) and Yn=Cn*SIN (An*PI ()/180), by number
Strong point is converted into the data set that can be used for modeling, data set is imported in 3 d modeling software, 3 d modeling software is according to number
High-precision three-dimensional curved surface is built according to collection, realizes three-dimension curved surface modeling；The Xn and Yn represents the X and Y coordinates value of n-th group of data,
Described Cn, A1 represent initial data polar radius and polar angle value；(An*PI ()/180) represent angle value being converted into radian
Value.
In a kind of aforementioned high-precision three-dimensional curved surface modeling method, the 3 d modeling software is UG7.5.
In a kind of aforementioned high-precision three-dimensional curved surface modeling method, the method is using office software
MicrosoftExcel handles data.
Compared with prior art, the present invention is handled by analytic surface data, and to curved surface data, and data are converted
To can be used for the data set of modeling, 3 d modeling software builds high-precision three-dimensional curved surface according to data set, realizes three-dimension curved surface
Modeling；The establishment for not being only three-dimensional program provides master pattern, compared with traditional approach, reduces the importing largely put, and builds
Three-dimension curved surface can independently change, in addition application method is simple.In conclusion the method for the present invention is simple, it is three-dimensional bent in structure
Master pattern can be provided for the establishment of three-dimensional modeling program during face, not only reduce the quantity of point data importing, simplify modeling
Operation, and the precision modeled is higher, and the three-dimension curved surface of structure can independently be changed.
Description of the drawings
Fig. 1 is three-D cam structure and type face；
Fig. 2 is polar radius and polar angle representation method；
Fig. 3 is change file format step；
Fig. 4 is file name formats；
Fig. 5 is spline curve order；
Fig. 6 is by a generation spline curve；
Fig. 7 is dot file dialog box；
Fig. 8 is 2.73 layer data curves；
Fig. 9 is 5 spline curve；
Figure 10 is by curve group command；
Figure 11 is generation three-dimensional space curved surface；
Figure 12 is the ready-made face of five curves；
Figure 13 is complete three-D cam curved surface；
Figure 14 is to suture the complete three-D cam curved surface that precision is " 0.0001 ".
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples, but be not intended as to the present invention limit according to
According to.
Embodiment.A kind of high-precision three-dimensional curved surface modeling method, as shown in Fig. 1 to Figure 14, this method is bent by analyzing
Data, are converted into the data set that can be used for modeling by face data, and handling curved surface data, 3 d modeling software according to
Data set builds high-precision three-dimensional curved surface, realizes three-dimension curved surface modeling.
The method is by analytic surface data, and will polar angle, polar radius data point be converted into X, Y coordinate form,
By the spot projection of polar form to rectangular coordinate system X and Y-axis, using formula Xn=Cn*COS (An*PI ()/180) and Yn=
Cn*SIN (An*PI ()/180) handles data point, data point is converted into the data set that can be used for modeling, by number
It is imported in 3 d modeling software according to collection, 3 d modeling software builds high-precision three-dimensional curved surface according to data set, realizes three-dimension curved surface
Modeling；The Xn and Yn represents the X and Y coordinates value of n-th group of data, and described Cn, A1 represent initial data polar radius and polar angle value；
(An*PI ()/180) represent angle value being converted into radian value；The 3 d modeling software is UG7.5；The method is
Data are handled using office software MicrosoftExcel.
Specific operation process：The using effect of the artificial verification present invention of application, models three-D cam structure；
(1), design of part and data analysis
1. three-D cam structure (as shown in Figure 1)
The basic structure of three-D cam as seen from the figure, while three-D cam curved surface is type face by the downward 4mm of end face A
Starting；Surface extending terminates to end face B；
2. three-D cam curved surface data (being shown in Table one) and analysis
(table one) three-D cam curved surface data point set
" 0,0.49,1.04 ... 9.98 " represent the specific size of " L " in Fig. 1 respectively in table one；
R in table oneK、Represent polar radius and polar angle (as shown in Figure 2)；
1. table one provides no less than 208 space coordinate points in the form of polar radius and polar angle, and passes through the collection of these points
Close the structure to determine three-D cam curved surface；
2. according to one data of table, these point sets are obtained to be arranged on " 0,0.49,1.04 ... 9.98 " on " Z " value coordinate,
It is the curved surface for being fitted and being formed with certain rule by 13 curves to therefore deduce that 3-D out wheel-type face.For ease of discussing,
We are respectively using " 0,0.49,1.04 ... 9.98 " layer as Curve numberings.As curve is properly termed as " 0 layer when " L " value is " 0 "
Curve ".
(2), three-D cam curved surface data is handled
One data of table is used, which to establish three-dimension curved surface, to be needed polar angle, polar radius data point being converted into the form of X, Y coordinate
Data point.
Polar angle, polar radius data point are converted into the data point in the form of X, Y coordinate, essence is exactly by polar form
Spot projection to rectangular coordinate system X, Y-axis.
1. polar angle, polar radius data point are converted into X, Y coordinate form
Data processing is carried out using office software (MicrosoftExcel).Wherein use equation below：
Xn=Cn*COS (An*PI ()/180) is for example：X1=C1*COS (A1*PI ()/180)
Yn=Cn*SIN (An*PI ()/180) is for example：X1=C1*SIN (A1*PI ()/180)
Wherein, Xn, Yn represent the X of n-th group of data, Y-coordinate value；
Cn, A1 represent initial data polar radius and polar angle value；
(An*PI ()/180) represent angle value being converted into radian value；
2. data that treated (are shown in Table two, table three, table four, table five and table six)；
(table two) 2.73 layers of curve X, Y, Z coordinate
(table three) 2.98 layers of curve X, Y, Z coordinate
(table four) 4.07 layers of curve X, Y, Z coordinate
(table five) 5 layers of curve X, Y, Z coordinate
(table six) 5.32 layers of curve X, Y, Z coordinate
Z coordinate in tables of data is made of " L ", " 4 " in Fig. 1.That is Z=-4-L；Z values just establish curved surface for losing side.
3. the change of data format
Before 5 curves are imported three-dimensional software (UG7.5), file " xls " should be changed to " dat " form, with 2.73 layers
It is introduced for curve (as shown in Figure 3)；
(1) right mouse button is clicked, selectes renaming；
(2) " xls " is changed to " dat " form；
(3) during pop-up " changing file extension, file can be caused unavailable, to be changed really ", click is order；
(4) remaining 4 curve data file format is changed to " dat " successively.
3rd, the foundation of three-D cam curved surface
According to 5 curve datas handled well, three-D cam surface model is established, step presses following progress：
(1), Chinese (with " 1 " for filename, as shown in Figure 4) cannot be had by depositing curve data to F disks and filename；
(2), start three-dimensional software (UG7.5) and establish model file " sanweiqumian.pat " click insertion menu selection
Spline curve order (as shown in Figure 5) in curve；
(3), curve is built into " passing through a little " order after spline curve order, is selected, clicks through dot command entrance
" passing through a generation spline curve " dialog box；Curve type selects " multistage curve " option；It is (bent to occur curve order in dialog box
Line order is higher, represents that the curve of system fitting is more accurate, closer to the preferable curve needed；General curve order " 3 " is
Disclosure satisfy that the required precision of processing) it fills in " 3 " (as shown in Figure 6)；
(4), after entering through a generation spline curve order, " point in file " order is clicked, UG7.5 softwares can be automatic
Pop up dot file dialog box；Meanwhile select the curve data file " 1 " created and simultaneously 5 curves of display in dialog box
Data file (as shown in Figure 7)；
(5), it is (- 6.73.dat files) that 2.73 layers of curve data are selected in dot file dialog box；Selected relative coordinate
It is WCS (mark relative coordinate system to establish spline curve)；Click " OK " order (as shown in Figure 8)；
(6), remaining 4 curve data is selected in by generation spline curve dialog box successively, generation is as shown in Figure 8
Spline curve group；From Fig. 9, it can be seen that 5 spline curve are formed by the data point set by every curve respectively
And from diagram it can be seen that curve compares fairing.
(7), the three-dimension curved surface being made of in UG7.5 a plurality of curve is known as grid surface, so being constructed by grid curve
The curved surface of three-D cam clicks the insertion order in menu bar, selects grid surface, and selection passes through curve group command (such as Figure 10
It is shown)；
(8), after clicking " passing through curve group " order, corresponding dialog box is popped up, successively trade-off curve, the side of note curve
To being consistent；Conclusion button should be clicked after selected direction of a curve；Setting-out order of a curve should write " 3 ", then click and determine life
Into three-dimensional space curved surface as shown in figure 11；
(9), it clicks " stretching " order and establishes the curved surface that curve group " 0,0.49,1.04,2.03,2.73 " is formed, pay attention to
Precision should be adjusted to " 0.0001 ", similarly, establish " 5.32,5.99,7.04,8.97,9.98 " ready-made face of this five curves
(as shown in figure 12)；
(10), it clicks " rotation " order and the 3-D out wheel-type face exactly matched with table one is formed on the both sides of existing curved surface
(as shown in figure 13)；
(11), three-dimension curved surface should be carried out suture and form a song by process, the processing quality for guarantee part
Face.It clicks " suture " order and is changed to suture precision " 0.0001 " (as shown in figure 14).
Step more than establishes complete three-D cam surface model.
Claims (4)
1. a kind of high-precision three-dimensional curved surface modeling method, it is characterised in that：This method is by analytic surface data, and to curved surface
Data are handled, and data are converted into the data set that can be used for modeling, and 3 d modeling software builds high-precision according to data set
Three-dimension curved surface is spent, realizes three-dimension curved surface modeling.
2. a kind of high-precision three-dimensional curved surface modeling method according to claim 1, it is characterised in that：The method is to pass through
Analytic surface data, and polar angle, polar radius data point will be converted into X, Y coordinate form, by the spot projection of polar form extremely
Rectangular coordinate system X and Y-axis, using formula Xn=Cn*COS (An*PI ()/180) and Yn=Cn*SIN (An*PI ()/180) logarithm
Strong point is handled, and data point is converted into the data set that can be used for modeling, data set is imported in 3 d modeling software, three
It ties up modeling software and high-precision three-dimensional curved surface is built according to data set, realize three-dimension curved surface modeling；The Xn and Yn represents n-th group number
According to X and Y coordinates value, described Cn, A1 represent initial data polar radius and polar angle value；(An*PI ()/180) represent will
Angle value is converted into radian value.
3. a kind of high-precision three-dimensional curved surface modeling method according to claim 1, it is characterised in that：The three-dimensional modeling is soft
Part is UG7.5.
4. a kind of high-precision three-dimensional curved surface modeling method according to claim 1, it is characterised in that：The method is to use
Office software Microsoft Excel handle data.
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| CN112528426A (en) * | 2020-11-16 | 2021-03-19 | 中国航发西安动力控制科技有限公司 | Method for establishing three-dimensional cam materialized model based on coordinate point position conversion |
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Application publication date: 20180629 |