CN106021731A - Die surface design method of multi-patch blending surface part - Google Patents
Die surface design method of multi-patch blending surface part Download PDFInfo
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- CN106021731A CN106021731A CN201610341461.4A CN201610341461A CN106021731A CN 106021731 A CN106021731 A CN 106021731A CN 201610341461 A CN201610341461 A CN 201610341461A CN 106021731 A CN106021731 A CN 106021731A
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- curved surface
- extension
- blending
- blending surfaces
- dough sheet
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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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
- G06F30/17—Mechanical parametric or variational design
Abstract
The invention provides a die surface design method of a multi-patch blending surface part, relates to the design method of a die surface, and mainly solves the problem that in a design process, extracted part multi-patch blending surfaces are difficult to be extended. The method comprises the steps of interactively extracting curved surfaces of the part; according to an outer contour shape of the part curved surfaces, in combination with a topology decomposition algorithm, a technical algorithm and a curve and surface interpolation extension algorithm, proposing curved surface decomposition extension and curved surface interpolation extension; and respectively corresponding to extension of a part curved surface with a non-rectangular outer contour and extension of a part curved surface with an approximate rectangular outer contour. The die surface design method of the multi-patch blending surface part provided by the invention solves the problem of mutual interference after the extension of the curved surface boundary in all directions caused by the discontinuity of the curved surface boundary line, and avoids the discontinuous and unsmooth curved surface after extension, so that the quality and efficiency of the extension of the multi-patch blending surface can be improved to a great extent.
Description
Technical field
The present invention relates to mould structure design, particularly relate to part multi-plane sheet Blending surfaces in the quasi spline of mould
Extension.
Background technology
In modern manufacturing industry, much some had the processing of complex-curved constitutional detail, owing to needs are reserved
It is prolonged treatment that the reasons such as the allowance of part need these curved surfaces to carry out, and the complexity of these curved surface features
Bigger difficulty is brought to extension.
The architectural feature especially surface boundary of curved surface is required relatively by the method extended curved surface traditionally
Height, all includes the command function of surface extending in the most most of Three-dimensional Design Software.But this
The premise calls of a little command functions is the highest, and the especially requirement to surface boundary is too high, typically requires song
Border, face continual curvature, so could utilize these command functions to be well on curved surface extension.But it is a lot
Curved surface is the Blending surfaces being spliced by the discontinuous space curved surface of multiple curvature rather than individual is the most bent
Face, so utilizes these functions just can not extend curved surface smoothly.
Between each patch of composition Blending surfaces, curvature is not necessarily continuous, there may be mistake between adjacent curved surface
Position, also likely to be present indefinite geometric topo-relationship between curved surface, and these factors all can have influence on curved surface
The quality extended and efficiency, it is likely that surface extending failure can be caused.For this many dough sheets Blending surfaces
Situation, does not all have more effectively command function easily to solve these in the three-dimensional software that existing market is run
Problem, the most not yet proposes solution efficiently and effectively.
Summary of the invention
Technical problem: the problem being difficult to for many dough sheets Blending surfaces set forth above extend, the present invention proposes
The surface decomposition decomposed based on topology extends and surface interpolation of based on surface reconstruction extends and extends, thus reaches
Many dough sheets Blending surfaces is realized the purpose extended.
Summary of the invention: for solving above-mentioned technical problem, the present invention provides a kind of many dough sheets Blending surfaces zero
The die-face design method of part, the method comprises the following steps:
Judge extension type step according to curved surface profile: if the phase knot of the single curved surface of acquisition and original surface
Fruit is some continuum boundary, then utilize surface decomposition stretching method to extend curved surface, otherwise then utilize curved surface to insert
Value extends stretching method and extends curved surface；Blending surfaces subvertical for angle between adjacent boundary,
And its contour shape extends, close to rectangular configuration, application surface interpolation, the extending effect that stretching method obtains estimating；
Surface decomposition expanding step: obtain original Blending surfaces, will spell according to the topological structure of Blending surfaces
Connect surface decomposition and become one group of single dough sheet, obtain the border of single dough sheet, and ask friendship with original Blending surfaces；
Whether it is one according to seeking knot topological field really, determines that single dough sheet is by asking friendship border to extend, still continuing
Continuous decompose until topological field is to extend by border, single territory after one again；After each single dough sheet extends, should
The curved surface after extending is obtained with curved surface combination technology；
Surface interpolation extends expanding step: certain limit along the original Blending surfaces border being similar to rectangle creates
Plane, on the basis of this plane, along the direction of the adjacent edge of square boundary, creates one group of equally spaced biasing
Curved surface；Carry out equidistant parallel plane bunch curved surface cutting and hand over, and the set of curves obtained is carried out interpolation extension
To specific length, the set of curves sliding-model control after will extend over, obtain discrete rear data point set；Utilize curve
Matching and the rule of Skinning Surfaces, fit to final curved surface by the discrete data point set obtained.
Preferably, described foundation curved surface profile judges that the acquisition mode intersecting border in extension type step uses
Topology decomposition technique, processes the solid obtaining Blending surfaces by geometric properties, utilizes solid to obtain and spells
Connect the topological structure of curved surface, isolate each topology dough sheet successively, obtain intersection edges bound component.
Preferably, described surface decomposition expanding step mean camber combine refer to utilize curved surface topological relation, by point,
Line, surface element constitute individual dough sheet, then are constituted the curved surface after extension by individual dough sheet each.
Preferably, during described surface interpolation extends expanding step, set of curves discretization algorithm uses and considers curve
The action method such as grade of Curvature varying situation.
Beneficial effect: integrated use topology of the present invention decomposition, interpolation algorithm and Skinning Surfaces matching etc.
Knowledge, it is achieved that the extension of many dough sheets Blending surfaces.Solve owing to surface boundary line discontinuously causes song
Border, face all directions interfere after extending, and make the discontinuous rough problem of extension curved surface of acquisition, greatly
Improve greatly quality and the efficiency of surface extending.
In consideration of it, the present invention has wide application and development prospect.
Accompanying drawing explanation
Fig. 1 is the die-face design method flow diagram of many dough sheets Blending surfaces part
Fig. 2 is original Blending surfaces figure
Fig. 3 is Blending surfaces decomposing schematic representation
Fig. 4 is that Blending surfaces seeks friendship schematic diagram with individual decomposition surface boundary each
Fig. 5 is that each individual decomposes surface extending and engage schematic diagram
Fig. 6 is to extend to engage curved surface design sketch
Fig. 7 is original Blending surfaces figure
Fig. 8 is to set up to cut to hand over bundle of planes design sketch
Tu9Shi Jiejiao family of curves interpolation extension effect figure
The action method principle schematic such as Figure 10 is
Figure 11 is to cut to hand over set of curves discretization design sketch
Figure 12 is eyelid covering method fitting surface design sketch
Detailed description of the invention
Below in conjunction with specification drawings and specific embodiments, the present invention will be further described in detail.
The die-face design method of many dough sheets Blending surfaces part that the present invention provides, the method includes following
Step:
Judge extension type step according to curved surface profile: if the phase knot of the single curved surface of acquisition and original surface
Fruit is some continuum boundary, then utilize surface decomposition stretching method to extend curved surface, otherwise then utilize curved surface to insert
Value extends stretching method and extends curved surface；Blending surfaces subvertical for angle between adjacent boundary,
And its contour shape extends, close to rectangular configuration, application surface interpolation, the extending effect that stretching method obtains estimating；
Surface decomposition expanding step: obtain original Blending surfaces, will spell according to the topological structure of Blending surfaces
Connect surface decomposition and become one group of single dough sheet, obtain the border of single dough sheet, and ask friendship with original Blending surfaces；
Whether it is one according to seeking knot topological field really, determines that single dough sheet is by asking friendship border to extend, still continuing
Continuous decompose until topological field is to extend by border, single territory after one again；After each single dough sheet extends, should
The curved surface after extending is obtained with curved surface combination technology；
Surface interpolation extends expanding step: certain limit along the original Blending surfaces border being similar to rectangle creates
Plane, on the basis of this plane, along the direction of the adjacent edge of square boundary, creates one group of equally spaced biasing
Curved surface；Carry out equidistant parallel plane bunch curved surface cutting and hand over, and the set of curves obtained is carried out interpolation extension
To specific length, the set of curves sliding-model control after will extend over, obtain discrete rear data point set；Utilize curve
Matching and the rule of Skinning Surfaces, fit to final curved surface by the discrete data point set obtained.
Described foundation curved surface profile judges that the acquisition mode intersecting border in extension type step uses topology point
Solution technology, processes the solid obtaining Blending surfaces by geometric properties, utilizes solid to obtain Blending surfaces
Topological structure, isolate successively each topology dough sheet, obtain intersection edges bound component.
Described surface decomposition expanding step mean camber combines and refers to utilize curved surface topological relation, by point, line, surface
Element constitutes individual dough sheet, then is constituted the curved surface after extension by individual dough sheet each.
Described surface interpolation extends set of curves discretization algorithm employing in expanding step and considers curvature of curve change
The action method such as grade of change situation.
Being illustrated in figure 1 the die-face design method flow of many dough sheets Blending surfaces part, the method is first
Obtain part Blending surfaces and border；Then, judge the particular type of quasi spline according to borderline properties, and
Correspond respectively to surface decomposition and realize extending method or the surface interpolation extension realization splicing of Blending surfaces
The extending method of curved surface；Finally, the quasi spline of many dough sheets Blending surfaces is completed.
Embodiment 1 applies surface decomposition to realize the extension of Blending surfaces, for the detailed enforcement of the present invention is described
Step and the result of acquisition.Embodiment 2 applies surface interpolation to extend the extension realizing Blending surfaces, is used for
Illustrate that the present invention's implements step and the result of acquisition in detail.
Embodiment 1 applies surface decomposition to realize the extension of Blending surfaces:
Operation object: Blending surfaces
Operation target: utilize topology to decompose, Blending surfaces is decomposed into multiple single patch, extracts original
Blending surfaces and the border of individual patch each, and by the border of each single curved surface and original Blending surfaces border
Carrying out asking friendship to process, obtain the extension border, local of each individual curved surface, respectively individual curved surface is at local boundary
Carrying out prolonged treatment, each single curved surface after will extend over engages, the Blending surfaces after being extended, i.e.
Curved surface after extending for original Blending surfaces.
Step 1, importing correlated parts file, the interactive Blending surfaces extracted, as shown in Figure 2.
Step 2, as it is shown on figure 3, Blending surfaces to be decomposed into multiple single patch,.
Step 3, as shown in Figure 4, extracts border and the border of individual curved surface each of Blending surfaces, and will be each
Individual surface boundary asks friendship with original Blending surfaces border respectively, obtains local and extends border.
Step 4, as it is shown in figure 5, after determining surface extending length and surface extending pattern, will each individual
Curved surface extends boundary in local and extends according to the requirement of development length and extension mode.
Step 5, after extending in step 4, each individual extends curved surface and carries out joining process, obtains engaging extension
Curved surface, obtains engaging extension curved surface effect as shown in Figure 6.
The curved surface that engages obtained by being operated by above step method is the curved surface after original Blending surfaces extends,
The exploitativeness of the present invention is proved further by the present embodiment.
Embodiment 2 applies surface interpolation to extend the extension realizing Blending surfaces
Operation object: Blending surfaces
Operation target: acquire Blending surfaces information, curved surface is carried out sliding-model control, then to discretization
Obtain data and carry out interpolation extension, finally utilize B-spline curves matching and Skinning Surfaces rule by all discrete
Data point fits to a continuous curve surface, is the curved surface after original Blending surfaces extends.
Step 1, imports correlated parts file, extracts the curved surface shown in Fig. 7, and obtains curved surface features information.
Step 2, determines U, V direction, is respectively created the initial ginseng being parallel to each other at curved surface two ends, U direction
According to plane.Determine and cut the spacing handed between plane, obtain cutting with initial plane skew and hand over family of planes, such as Fig. 8
Shown in.
Step 3, as it is shown in figure 9, hand over bundle of planes to cut friendship original surface with cutting of obtaining in step 2, obtains
The Jie Jiao family of curves that spacing is equal, after determining the outward extending length of curved surface, hands over curve to two ends by all sections
Extend corresponding length.
Step 4, determines curve discrete spacing, hands over curve by the action method that waits shown in Figure 10 by all sections
According to discrete pitch requirements sliding-model control, obtain data point set as shown in figure 11.
Step 5, according to the regular data point set that step 4 is obtained of B-spline curves in U, V direction respectively
Matching obtains B-spline curves.
Step 6, fits to a continuous print according to the B-spline curves that step 5 is obtained by Skinning Surfaces rule
Skinning Surfaces.As shown in figure 12.
Skinning Surfaces obtained by being operated by above step method is the curved surface after original Blending surfaces extends, logical
Cross the present embodiment and prove the exploitativeness of the present invention further.
Claims (4)
1. the die-face design method of the part of dough sheet Blending surfaces more than a kind, it is characterised in that: the method
Comprise the following steps:
Judge extension type step according to curved surface profile: if the phase knot of the single curved surface of acquisition and original surface
Fruit is some continuum boundary, then utilize surface decomposition stretching method to extend curved surface, otherwise then utilize curved surface to insert
Value extends stretching method and extends curved surface；Blending surfaces subvertical for angle between adjacent boundary,
And its contour shape extends, close to rectangular configuration, application surface interpolation, the extending effect that stretching method obtains estimating；
Surface decomposition expanding step: obtain original Blending surfaces, will spell according to the topological structure of Blending surfaces
Connect surface decomposition and become one group of single dough sheet, obtain the border of single dough sheet, and ask friendship with original Blending surfaces；
Whether it is one according to seeking knot topological field really, determines that single dough sheet is by asking friendship border to extend, still continuing
Continuous decompose until topological field is to extend by border, single territory after one again；After each single dough sheet extends, should
The curved surface after extending is obtained with curved surface combination technology；
Surface interpolation extends expanding step: certain limit along the original Blending surfaces border being similar to rectangle creates
Plane, on the basis of this plane, along the direction of the adjacent edge of square boundary, creates one group of equally spaced biasing
Curved surface；Carry out equidistant parallel plane bunch curved surface cutting and hand over, and the set of curves obtained is carried out interpolation extension
To specific length, the set of curves sliding-model control after will extend over, obtain discrete rear data point set；Utilize curve
Matching and the rule of Skinning Surfaces, fit to final curved surface by the discrete data point set obtained.
2. according to the die-face design method of the many dough sheets Blending surfaces part described in claim 1, its
It is characterised by: the acquisition mode that described foundation curved surface profile judges to intersect in extension type step border uses opens up
Flutter decomposition technique, processed the solid obtaining Blending surfaces by geometric properties, utilize solid to obtain splicing
The topological structure of curved surface, isolates each topology dough sheet successively, obtains intersection edges bound component.
3. according to the die-face design method of the many dough sheets Blending surfaces part described in claim 1, its
Be characterised by: described surface decomposition expanding step mean camber combine refer to utilize curved surface topological relation, by point,
Line, surface element constitute individual dough sheet, then are constituted the curved surface after extension by individual dough sheet each.
4., according to the die-face design method of the many dough sheets Blending surfaces part described in claim 1, it is special
Levy and be: described surface interpolation extends set of curves discretization algorithm employing in expanding step and considers curvature of curve change
The action method such as grade of change situation.
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| CN201610341461.4A CN106021731B (en) | 2016-05-19 | 2016-05-19 | The die-face design method of multi-panel piece Blending surfaces part |
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| CN201610341461.4A CN106021731B (en) | 2016-05-19 | 2016-05-19 | The die-face design method of multi-panel piece Blending surfaces part |
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Cited By (2)
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| CN109255196A (en) * | 2018-09-05 | 2019-01-22 | 重庆创速工业有限公司 | A kind of design implementation method of reinforcing rib module |
| CN110109230A (en) * | 2019-05-24 | 2019-08-09 | 西安交通大学 | A kind of intelligent splicing assembly method of aspheric noodles complex curved surface part |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110109230A (en) * | 2019-05-24 | 2019-08-09 | 西安交通大学 | A kind of intelligent splicing assembly method of aspheric noodles complex curved surface part |
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