CN1176784C - Three-dimensional geometry modeling method for free-camber internal cavity surface - Google Patents
Three-dimensional geometry modeling method for free-camber internal cavity surface Download PDFInfo
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- CN1176784C CN1176784C CNB021453179A CN02145317A CN1176784C CN 1176784 C CN1176784 C CN 1176784C CN B021453179 A CNB021453179 A CN B021453179A CN 02145317 A CN02145317 A CN 02145317A CN 1176784 C CN1176784 C CN 1176784C
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Abstract
The present invention relates to a three-dimensional geometry modeling method of the surface of a free-camber inner cavity. A measurement and processing integrated apparatus is adopted. By a method that materials of a measured work piece are removed layer by layer, geometric outlines of each layer of plane sections of an inner cavity of the work piece are obtained, a displacement sensor is used for tracing and measuring the boundary of the section outline of the inner cavity at the same time, and the accurate sampling point information of the outline of the inner cavity is obtained. The sampling point information of all outlines of the sections of each layer of inner cavities finally constructs a three-dimensional geometry model of the surface of the inner cavity, and the model further generates a camber processing model facing processing. The method of the present invention can obtain three-dimensional geometry models of complicated free-camber inner cavities of various metal objects and nonmetal objects in a high efficiency and high precision mode, the present invention has low requirements for the apparatus, and the purpose of manufacturing components provided with the free-camber inner cavities at a high speed is realized.
Description
Technical field:
The present invention is a kind of 3 dimensional coil geometry modeling method of free form surface surface of internal cavity, relates to three-dimensional measurement and three-dimensional modeling problem, is used for the three-dimensional digital of object surface of internal cavity profile, belongs to Machine Design and manufacturing field.
Background technology:
The product design design that with the free form surface is feature is widely used in fields such as automobile, aircraft, steamer, household electrical appliance and medical rehabilitation.The geological information of such product external surfaces can more easily obtain by existing various reverse methods, but obtaining of its surface of internal cavity geometric configuration is then much more difficult by contrast.This mainly is that gauge head is to be beyond one's reach for most of inner chamber curved surface because for the complex free curved surface inner chamber, the gauge head of common survey equipment only can arrive limited spatial dimension.In addition, the measurement of complicated inner cavity free form surface needs accurately to adopt a little thick and fast, and this also can't realize at inner chamber for common survey equipment.
At present, the mensuration of inner chamber free form surface has excusing from death wave measurement method, adopts the tomoscan measuring method of CT (ComputerTomography) and MRI (Magnetic Resonance Imaging).Compare with CT tomoscan measuring method, excusing from death wave measurement method measuring speed is slow and be subjected to object materials and surface properties affect precision lower, and MRI tomoscan method not only costs an arm and a leg and is not suitable for the object of metal material.Therefore, become the main means that the object with complex internal structure is measured in industrial circle CT tomoscan method, as: (" industry CT technology and NDT thereof use ", modern physics knowledge, S1 phase in 2000).But CT tomoscan method still exists spatial resolution low, obtains data and needs long integral time, and the reconstructed image calculated amount is big, the high deficiency of cost.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, propose a kind of 3 dimensional coil geometry modeling method of free form surface surface of internal cavity,, obtain metal parts complex free curved surface inner chamber geometric configuration accurately with efficiently.
For reaching such purpose, the present invention adopts measurement, processing integration apparatus, remove the geometric profile in each layer plane cross section of method acquisition workpiece lumen of measured workpiece material by layering, use displacement transducer to follow the tracks of and measure simultaneously intracavity section profile border, obtain the accurate sampling point information of inner chamber profile, finally construct the 3-D geometric model of surface of internal cavity by whole configuration sampling dot informations of each layer intracavity section, and further generate towards the Machining of Curved Surface model of processing by this model.
The inventive method comprises following concrete steps:
1) the measured workpiece clamping is processed on the integration apparatus to measuring, this equipment can be finished by disposable clamping and measure and processing tasks.Measuring the processing integration apparatus can constitute by the displacement transducer that is used for surface measurement is installed on the main shaft of general NC milling machine;
2) inner chamber as sample workpiece does not reveal, and then cuts thickness according to pre-set layer and successively removes material and reveal until inner chamber by measuring the processing integration apparatus, and its middle level is cut thickness and can be determined according to user's accuracy requirement;
3) measuring point of displacement transducer is followed the tracks of the intracavity section profile and measure;
4) after the profile measurement in each cross section finishes, whether the whole inner cavity of judging the measured workpiece sample is measured and is finished, finish as not measuring, then cut thickness according to predefined layer and remove layer of material, and return step 3) to descend the measurement of one deck profile by measurement processing integration apparatus;
5) measured as the whole inner cavity of measured workpiece sample and finished, then carried out three-dimension curved surface and rebuild according to the whole take-off spots of each layer profile.Can adopt the three-dimension curved surface method for reconstructing of scattered data being in the curve reestablishing process; Also can set up the curve model of every layer cross section earlier according to every layer cross section profile take-off spot, again by order superposition and then generation three-dimensional surface model.
But obtain the 3-D geometric model of various metals and non-metallic objectsit is not a metal object complex free curved surface inner chamber method high-efficiency high-accuracy of the present invention.Compare with existing method, not only lower but also cost is low to the requirement of relevant device.Can obtain in a step by the three-dimensional model that obtains,, significantly reduced the time and the expense of user's otherwise designed exploitation to realize making fast parts with free form surface inner chamber towards the processing model of processing.Though the part sample is destroyed, the three-dimensional model that obtains can be used for duplicating in large quantities fast raw sample.
Embodiment:
The inventive method operating process comprises: the measured workpiece clamping is being measured on the processing integration apparatus, whether the inner chamber of judging sample workpiece reveals, then successively do not remove material and reveal if appear until inner chamber, follow the tracks of luminal border by the measuring point of displacement transducer then and measure, whole inner cavity measurement as the measured workpiece sample finishes, and then sets up the surface of internal cavity 3-D geometric model, if do not measure, then excise layer of material, the measurement of following one deck profile.
The measured workpiece of the embodiment of the invention is the admission passage of automobile, and the measurement processing integration apparatus of employing goes out the three-axis numerical control milling machine that the laser digitizing instrument is installed on the main shaft and constitutes.
Elder generation is with clamping workpiece and location before operation.The all subsequent manipulations step is all measured the processing integration apparatus at one---and finish on the three-axis numerical control milling machine of laser digitizing instrument, can avoid like this on distinct device because the error that the repeated clamping location is caused can improve integrated operation efficient in addition.Measured workpiece automobile admission passage by clamping after because the inner chamber of measured workpiece sample do not reveal, system then cuts thickness according to pre-set layer and successively removes material and reveal until inner chamber.After inner chamber reveals, system then directly begins the measuring point of laser displacement sensor to be followed the tracks of the inner chamber profile and measure: we adopt the step-length radius arc tracing of studying voluntarily to form the measuring route of object boundary profile in the actual mechanical process, and high-efficiency high-accuracy obtain the sampled point of inner chamber profile, its sampling step length can be done further to adjust according to the local geometric complexity of profile.After the profile measurement in each cross section finishes, judging whether whole inner cavity is measured finishes, finish as not measuring, (layer is cut thickness and is depended on accuracy requirement then to cut thickness removal layer of material according to pre-set layer, in the present embodiment layer to cut thickness be 0.1mm), and begin to measure the inner chamber profile of next layer cross section.So repeatedly, until the measurement of finishing whole inner cavity.System will set up three-dimensional inner chamber geometric model according to the sampled point of each layer after the measurement of finishing whole inner cavity.We are according to the accuracy requirement of measurement of curved surface or processing in the actual mechanical process, tested zone is divided into tiny rectangular node by a fixed step size, extrapolate height value on all mesh nodes by measurement data then, and utilize the unique point of these mesh nodes as curved surface, set up the three-dimensional computer digital model of tested inner chamber curved surface.The three-dimensional computer digital model that utilization obtains, can one the step obtain processing model towards processing to realize making this tested part sample fast, significantly reduced the time and the expense of otherwise designed exploitation automobile admission passage.
Claims (2)
1, a kind of 3 dimensional coil geometry modeling method of free form surface surface of internal cavity is characterized in that comprising following concrete steps:
1) the measured workpiece clamping is processed on the integration apparatus to measuring, measured the processing integration apparatus and constitute by the displacement transducer that is used for surface measurement is installed on the main shaft of general NC milling machine;
2) inner chamber as sample workpiece does not reveal, and then cuts thickness by pre-set layer and successively removes material and reveal until inner chamber by measuring the processing integration apparatus;
3) measuring point of displacement transducer is followed the tracks of the intracavity section profile and measure;
4) after the profile measurement in each cross section finishes, whether the whole inner cavity of judging the measured workpiece sample is measured and is finished, finish as not measuring, then cut thickness removal layer of material according to predefined layer, the measuring point of displacement transducer is followed the tracks of the intracavity section profile and carried out the measurement of next layer profile by measuring the processing integration apparatus;
5) measured as the whole inner cavity of measured workpiece sample and finished, then carried out three-dimension curved surface and rebuild according to the whole take-off spots of each layer profile.
2, as the 3 dimensional coil geometry modeling method of the said free form surface surface of internal cavity of claim 1, it is characterized in that adopting in the curve reestablishing process three-dimension curved surface method for reconstructing of scattered data being, or set up earlier the curve model of every layer cross section according to every layer cross section profile take-off spot, again by the order superposition and then generate three-dimensional surface model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021453179A CN1176784C (en) | 2002-11-21 | 2002-11-21 | Three-dimensional geometry modeling method for free-camber internal cavity surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021453179A CN1176784C (en) | 2002-11-21 | 2002-11-21 | Three-dimensional geometry modeling method for free-camber internal cavity surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1422727A CN1422727A (en) | 2003-06-11 |
| CN1176784C true CN1176784C (en) | 2004-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021453179A Expired - Fee Related CN1176784C (en) | 2002-11-21 | 2002-11-21 | Three-dimensional geometry modeling method for free-camber internal cavity surface |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418027C (en) * | 2006-11-10 | 2008-09-10 | 大连理工大学 | A helix guidance surfaces numerical control processing method |
| CN102069419B (en) * | 2010-12-19 | 2012-05-30 | 吉林大学 | Ultraprecise free-form surface turning method of actively counteracting errors |
| CN102501012B (en) * | 2011-11-02 | 2014-02-26 | 沈阳飞机工业（集团）有限公司 | Method for processing curved phi-shaped element |
| CN105336004A (en) | 2014-06-27 | 2016-02-17 | 华为技术有限公司 | Curved surface model creating method and device |
| CN110657756A (en) * | 2019-09-03 | 2020-01-07 | 厦门金鹭特种合金有限公司 | Accurate measurement method for concave structure of blade/cutter |
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2002
- 2002-11-21 CN CNB021453179A patent/CN1176784C/en not_active Expired - Fee Related
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