CN103558807A - Tool path forming method based on curved surface morphology and curved surface dynamics of machined workpiece - Google Patents
Tool path forming method based on curved surface morphology and curved surface dynamics of machined workpiece Download PDFInfo
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- CN103558807A CN103558807A CN201310542428.4A CN201310542428A CN103558807A CN 103558807 A CN103558807 A CN 103558807A CN 201310542428 A CN201310542428 A CN 201310542428A CN 103558807 A CN103558807 A CN 103558807A
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Abstract
The invention provides a tool path forming method based on curved surface morphology and curved surface dynamics of a machined workpiece. The method includes the first step of carrying out force analysis on the working process of the workpiece to figure out the force field distribution of the curved surface of the workpiece when deformation of the workpiece is maximum, the second step of carrying out grid division on the force field distribution of the curved surface of the workpiece and carrying out curve fitting on points with the same applied force in the same force field region to form an equal force field line, the third step of carrying out discrete pointillized processing on all the equal force field lines with a set machining line spacing as the distance between the points, and the fourth step of carrying out curve fitting on discrete points in equal force fields to obtain a tool path based on the curved surface morphology and the curved surface dynamics of the machined workpiece. Through the method, the tool path is determined according to force analysis conditions so as to enable the direction of the tool path to be parallel to the forced direction of the curved surface, and consequently the phenomenon that the curved surface of the workpiece cracks due to tooling is prevented to the maximum extent. Furthermore, the damage of plunge milling tool marks to the textiles of the curved surface of the workpiece is prevented, and the service life of the workpiece is prolonged.
Description
Technical field
The present invention relates to a kind ofly based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path of curved surface formation method, belong to computer-aided manufacturing (computer Aided Manufacturing, CAM) technical field.
Background technology
Complex-curved type component is in industry extensive application such as delivery, the energy and national defence, and its manufacture level is representing national manufacturing core competitiveness.The development of the novel technique of manufacturing along with complex-curved digitizing, traditional geometry principle, model and algorithm have shown numerous disadvantages, aspect cutter path generation, the cutter path generation methods such as existing Isoparametric method, equidistant plane cutting method and Deng Can supreme people's court, these methods are also in existing complex-curved five-axle linkage processing, to generate the basic skills of five axle cutter paths.The cutter path generation method of Isoparametric method is calculated simple possible, but may occur the problem of cutter spacing redundancy and cutter spacing shortcoming, affects machining precision and efficiency; The cutter path method of generationing of equidistant plane cutting method is not only calculated section line more complicated, and how many cutting plane spacings be that the best is bad definite, there will be equally the redundancy of cutter spacing and the problem of shortcoming; The cutter path generation method of Deng Can supreme people's court can be avoided the problem of cutter spacing redundancy and shortcoming well, but calculates more complicated.
Above-mentioned existing cutter path generation method all has deficiency, and all tool sharpening path is not taken into account the impact of workpiece performance, workpiece machining path has the impact showing on workpiece performance, be mainly manifested in the suffered power of curve surface of workpiece pattern and curved surface complicated, during tool sharpening, destroyed surface of the work tissue, cause workpiece easily to crack in use procedure, shortened workpiece serviceable life.
Summary of the invention
For above-mentioned deficiency, the invention provides a kind ofly based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path of curved surface formation method, can solve the problem that traditional workpiece machining path affects workpiece performance.
The present invention solves the technical scheme that its technical matters takes: a kind ofly based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path of curved surface formation method, it is characterized in that, comprise the following steps:
Step 1: the workpiece course of work is carried out to force analysis, the force distribution of the curve surface of workpiece while obtaining workpiece deformation maximum;
Step 2: the force distribution of curve surface of workpiece is carried out to grid division, in region, the same field of force, stressed equal-sized point is carried out curve fitting, the field of force lines such as formation;
Step 3: take the path internal set as distance between points, to carrying out discrete point processing on the field of force lines such as all;
Step 4: the discrete point on the reciprocity field of force carries out curve fitting, tries to achieve based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path of curved surface.
Further, in described step 1, the step of the force distribution of the curve surface of workpiece while obtaining workpiece deformation maximum is specially: take curve surface of workpiece pattern as entrance, the workpiece course of work is carried out to force analysis, in CAM software, set up workpiece solid model, constraint workpiece lower surface six-freedom degree, choose solid element described workpiece solid model is carried out to grid division, at solid model upper surface, apply distributed force P, in solid model left-hand face, apply even cloth power F1, in solid model right lateral surface, apply even cloth power F2, solve the force distribution and the workpiece each point place deflection that draw curve surface of workpiece, wherein, evenly cloth power F1 and F2 are left perpendicular to model respectively, right lateral surface, and direction is pointed to solid model.
Further, in described step 2, adopt least square method to carry out curve fitting to stressed equal-sized point in region, the same field of force.
Further, in described step 3, adopt Matlab function to carry out the discrete processing of revealing to the field of force lines such as all.
Further, in described step 4, adopt the point on the Matlab function equity field of force to carry out curve fitting by least square method.
Further, the curve principle that point on the described reciprocity field of force carries out curve fitting by least square method is: this etc. on the line of the field of force a bit, find nearest point the field of force line such as adjacent, described matched curve the tangent vector at this some place perpendicular to etc. field of force line in the tangent vector at this some place.
The invention has the beneficial effects as follows: the present invention is based on curve surface of workpiece pattern force-bearing situation in the workpiece course of work is analyzed, according to force analysis situation, determine cutter path, make cutter path direction be parallel to curved surface and be subject to force direction, prevented that to the full extent workpiece from occurring that because tool sharpening causes curved surface the phenomenon of crackle occurs, not only avoided plug in milling cutter trace to curve surface of workpiece disorganization, and the serviceable life of having improved workpiece.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention;
Fig. 2 is the stressed schematic diagram of processing work, and in figure, P is distributed force, and F1, F2 are even cloth power;
Fig. 3 is the force distribution figure of curve surface of workpiece, in figure 1.-be 9. divided field of force area code;
Fig. 4 is the field of force line charts such as curve surface of workpiece, in figure solid line for etc. field of force line;
Fig. 5 such as is at the field of force line discrete point distribution plan, and in figure, solid line is for waiting field of force line, and stain such as is at the field of force line discrete point;
Fig. 6 is based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path figure of curved surface, in figure solid line for etc. field of force line, dotted line is cutter path.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are further described in detail.
As shown in Figure 1, of the present invention a kind of based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path of curved surface formation method, it comprises the following steps:
Step 1: as shown in Figure 2, take curve surface of workpiece pattern as entrance, the workpiece course of work is carried out to force analysis, in ANSYS software, set up workpiece solid model, constraint workpiece lower surface six-freedom degree, choose 45 pairs of described workpiece solid models of solid element Brick 8nbode and carry out grid division, at solid model upper surface, apply distributed force P, in solid model left-hand face, apply even cloth power F1, in solid model right lateral surface, apply even cloth power F2, solve the force distribution and the workpiece each point place deflection that draw curve surface of workpiece, as shown in Figure 3.Wherein, evenly cloth power F1 and F2 are surperficial perpendicular to model left and right side respectively, and direction is pointed to solid model.
Step 2: the force distribution of curve surface of workpiece is as shown in Figure 3 carried out to region division according to stressed size and each point deflection, mark off altogether 1. to 9. region, totally 9 field of forces.Gather the stressed size data of solid model data and each field of force of workpiece, with Matlab software, read described data, stressed equal-sized point in the same area on workpiece is carried out to matching with least square method function, the smooth curve of generation be workpiece etc. field of force line, as shown in Figure 4.
Step 3: take the path internal set as distance between points, carry out discrete revealing with Matlab software on the field of force lines such as all, as shown in Figure 5.
Step 4: adopt the point on the Matlab software equity field of force to carry out curve fitting with least square method function, the matched curve of gained is cutter path, as shown in Figure 6.Wherein, the curve principle that point on the described reciprocity field of force carries out curve fitting with least square method function is: this etc. on the line of the field of force a bit, find nearest point the field of force line such as adjacent, described matched curve the tangent vector at this some place perpendicular to etc. field of force line in the tangent vector at this some place.
The above is the preferred embodiment of the present invention, for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, and these improvements and modifications are also regarded as protection scope of the present invention.
Claims (6)
1. one kind based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path of curved surface formation method, it is characterized in that, comprises the following steps:
Step 1: the workpiece course of work is carried out to force analysis, the force distribution of the curve surface of workpiece while obtaining workpiece deformation maximum;
Step 2: the force distribution of curve surface of workpiece is carried out to grid division, in region, the same field of force, stressed equal-sized point is carried out curve fitting, the field of force lines such as formation;
Step 3: take the path internal set as distance between points, to carrying out discrete point processing on the field of force lines such as all;
Step 4: the discrete point on the reciprocity field of force carries out curve fitting, tries to achieve based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path of curved surface.
2. according to claim 1 based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path of curved surface formation method, it is characterized in that, in described step 1, the step of the force distribution of the curve surface of workpiece while obtaining workpiece deformation maximum is specially: take curve surface of workpiece pattern as entrance, the workpiece course of work is carried out to force analysis, in CAM software, set up workpiece solid model, constraint workpiece lower surface six-freedom degree, choose solid element described workpiece solid model is carried out to grid division, at solid model upper surface, apply distributed force P, in solid model left-hand face, apply even cloth power F1, in solid model right lateral surface, apply even cloth power F2, solve the force distribution and the workpiece each point place deflection that draw curve surface of workpiece, wherein, evenly cloth power F1 and F2 are left perpendicular to model respectively, right lateral surface, and direction is pointed to solid model.
3. according to claim 1ly based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path of curved surface formation method, it is characterized in that, in described step 2, adopt least square method to carry out curve fitting to stressed equal-sized point in region, the same field of force.
4. according to claim 1ly based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path of curved surface formation method, it is characterized in that, in described step 3, adopt Matlab function to carry out the discrete processing of revealing to the field of force lines such as all.
5. according to claim 1ly based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path of curved surface formation method, it is characterized in that, in described step 4, adopt the point on the Matlab function equity field of force to carry out curve fitting by least square method.
6. according to claim 5 based on machining curve surface of workpiece pattern and the dynamic (dynamical) cutter path of curved surface formation method, it is characterized in that, the curve principle that point on the described reciprocity field of force carries out curve fitting by least square method is: this etc. on the line of the field of force a bit, find nearest point the field of force line such as adjacent, described matched curve the tangent vector at this some place perpendicular to etc. field of force line in the tangent vector at this some place.
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| CN201310542428.4A CN103558807B (en) | 2013-11-06 | 2013-11-06 | Based on machining curve surface of workpiece pattern and curved surface dynamic (dynamical) cutter path formation method |
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| CN201310542428.4A CN103558807B (en) | 2013-11-06 | 2013-11-06 | Based on machining curve surface of workpiece pattern and curved surface dynamic (dynamical) cutter path formation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106020132A (en) * | 2016-06-07 | 2016-10-12 | 西北工业大学 | On-site actually measured cutting force data and off line optimization-based rough machining feed speed optimization method |
| CN106125666A (en) * | 2016-07-28 | 2016-11-16 | 大连理工大学 | The Machining of Curved Surface cutter path planing method being constraint with cutting force fluctuation |
| CN107728576A (en) * | 2017-09-21 | 2018-02-23 | 武汉科技大学 | Multi-shaft numerical control machining knife axial vector optimization method based on cutter stress deformation |
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| JPH09292909A (en) * | 1996-04-26 | 1997-11-11 | Kubota Corp | Flat part and standing wall part dividing method and recording medium |
| JP2003181745A (en) * | 2001-12-18 | 2003-07-02 | Fa Lab:Kk | Three dimensional machining method |
| CN101804585A (en) * | 2010-02-04 | 2010-08-18 | 南京航空航天大学 | Numerical control programming measurement method for residual stress field and device thereof |
| CN101840457A (en) * | 2010-05-07 | 2010-09-22 | 上海交通大学 | Method for reconstructing residual stress field of profile of large-dimension fir-type blade wheel groove |
| CN102063548A (en) * | 2011-01-07 | 2011-05-18 | 西安交通大学 | Method for optimally designing dynamic property of complete machine tool |
| EP2486996A2 (en) * | 2009-10-09 | 2012-08-15 | Doosan Infracore Co., Ltd. | Method for generating tool path in turning system |
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2013
- 2013-11-06 CN CN201310542428.4A patent/CN103558807B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09292909A (en) * | 1996-04-26 | 1997-11-11 | Kubota Corp | Flat part and standing wall part dividing method and recording medium |
| JP2003181745A (en) * | 2001-12-18 | 2003-07-02 | Fa Lab:Kk | Three dimensional machining method |
| EP2486996A2 (en) * | 2009-10-09 | 2012-08-15 | Doosan Infracore Co., Ltd. | Method for generating tool path in turning system |
| CN101804585A (en) * | 2010-02-04 | 2010-08-18 | 南京航空航天大学 | Numerical control programming measurement method for residual stress field and device thereof |
| CN101840457A (en) * | 2010-05-07 | 2010-09-22 | 上海交通大学 | Method for reconstructing residual stress field of profile of large-dimension fir-type blade wheel groove |
| CN102063548A (en) * | 2011-01-07 | 2011-05-18 | 西安交通大学 | Method for optimally designing dynamic property of complete machine tool |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106020132A (en) * | 2016-06-07 | 2016-10-12 | 西北工业大学 | On-site actually measured cutting force data and off line optimization-based rough machining feed speed optimization method |
| CN106020132B (en) * | 2016-06-07 | 2018-10-19 | 西北工业大学 | The roughing feeding speed optimization method of force data and offline optimization is cut based on field measurement |
| CN106125666A (en) * | 2016-07-28 | 2016-11-16 | 大连理工大学 | The Machining of Curved Surface cutter path planing method being constraint with cutting force fluctuation |
| CN106125666B (en) * | 2016-07-28 | 2018-06-08 | 大连理工大学 | Using cutting force fluctuation as the Machining of Curved Surface cutter path planing method of constraint |
| CN107728576A (en) * | 2017-09-21 | 2018-02-23 | 武汉科技大学 | Multi-shaft numerical control machining knife axial vector optimization method based on cutter stress deformation |
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