CN1632802A - Computer-aided design method for plow bottom surface - Google Patents
Computer-aided design method for plow bottom surface Download PDFInfo
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- CN1632802A CN1632802A CN 200410065892 CN200410065892A CN1632802A CN 1632802 A CN1632802 A CN 1632802A CN 200410065892 CN200410065892 CN 200410065892 CN 200410065892 A CN200410065892 A CN 200410065892A CN 1632802 A CN1632802 A CN 1632802A
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Abstract
This invention relates to a plow curve computer assisted design method, which comprises the following steps: to install standard software of Pro/ENGINEER system in computer; to design the parameters according to the detail requirements of the bottom plow; to select a right coordinate system with plow sharp end as origin; to adopt Pro/E to draw in three-dimensional space coordinate system in the order of bottom line-> plow outline curve-> two projecting-> outline generation ->curve-> senior curve-> outline-> mixed curve -> curve immersion-> curve optimization.
Description
Technical field
The present invention relates to a kind of auxiliary design method of the warping surface of plow bottom, especially a kind of computing machine of the standard software by the Pro/ENGINEER system is installed carries out the auxiliary design method of the warping surface of plow bottom.
Background technology
The warping surface of plow bottom is the important process face that is directly connected to mouldboard plow work effect, and traditional warping surface of plow bottom design mainly is to survey and draw on examination amends the law the basis, to obtain the warping surface of plow bottom; With the geometrograph and the mathematical methods design warping surface of plow bottom.At present the warping surface of plow bottom mainly contains following several specific design method: straight horizontal unit collimation method, tilt straight first collimation method, bended element line method, press plough face section curve family formation plough face method.
Straight horizontal unit collimation method forms principle and adopts three-dimensional system of coordinate exactly, moves along directrix (trajectory or lead) with straight first line, and is parallel to the XOY coordinate plane all the time, and constantly change the formed curved surface of angle (first line angle) of straight first line and ZOX coordinate plane.
The straight first collimation method formation plough face principle that tilts is exactly the end points with straight first line, along directrix (trajectory or lead), becomes the curved surface of certain rules motion formation by the angle with three projecting planes.Directrix (trajectory or lead) can be that straight line, broken line also can be plane or space curve.The characteristics that this principle forms curved surface are: according to the plough body job requirement, can be divided into mouldboard kicker S
1, plow breast S
3With ploughshare S
2Three parts.Because their boundary line is straight first line, so can do the burst design by the requirement of each several part.At home, the straight first collimation method that will tilt at first is used to study, survey and draw, put in order and analyze the universal plough body curved surface of paddy field ploughshare formula serial plough.Universal plough body curved surface is on practical basis, by examination amend the law (clay sculpture plough modulus method) southern water that designs, the warping surface of plow bottom of non-irrigated double as.Its chest is outstanding, the alar part distortion, as use the plane parallel and the warping surface of plow bottom to intersect with the plough body basal plane, its intersection is not a straight line, so can not design with straight horizontal unit collimation method.In addition, the straight first collimation method that tilts can be used Analytical Design, by the mathematical analysis of the warping surface of plow bottom, seeks the funtcional relationship between parameter, sets up the mathematical model of plough face.Utilize COMPUTER CALCULATION typical curve value, on this basis, plough the engineering design of face again.Jie Feixun (Jefferson) in 1788 proposition belongs to two curved surfaces of throwing by the math equation that two straight lines are the warping surface of plow bottom of directrix.1918 White (E.A.White) tried to achieve the surface equation of the Hall Bo Luoke plough body that constitutes by a slice hyperboloid of one sheet.
The principle that the bended element line method forms curved surface is exactly to form the warping surface of plow bottom with bended element line along directrix (trajectory or lead) motion.Bended element line can be used circular arc, para-curve or other curve.Directrix is two sections straight lines, and wherein one is ploughshare blade line.So-called bended element line is meant the last constant plane curve in transverse section (being parallel to the YOZ face).
Forming plough face method by plough face section curve family is meant with the one group of plane that is parallel to coordinate surface and dissects the warping surface of plow bottom, the intersection of gained.Family of curves can make amendment to reach predetermined operation quality by test.Coordinate surface has three, and that the corresponding section curve family of gained also has is contour, vertical profile, cross-sectional three groups.Claim the family of curves of digging with cross-sectional family of curves traditionally.In addition, have one group of intersection perpendicular to the plane of ploughshare sword and plough face to be called typical curve family, it is the concentrated expression of plough face performance, can be used as the main foundation that the check of plough face, pressing mold are made.Because each section curve is all inequality, so this method belongs to the empirical design category.These section curve families must be design considerations with the existing good warping surface of plow bottom all, the geometric properties that the curved surface that forms has is difficult to determine, generally be advanced development after, with the ruler plough face that reclines, seek whether to have on the plough face straight first line to exist, study it then again and form rule.
Above-mentioned various method for designing, when drawing all based on planimetric map, will comprise front view, vertical view and typical curve figure during mapping, show a complete warping surface of plow bottom, the three must unify combination, any one view trickle mistake occurs and all can affect to the whole warping surface of plow bottom, revises more loaded down with trivial details.Not only time-consuming during design, and the Change In Design cost is also bigger.Simultaneously, adopt traditional drafting method, the pictorial diagram of the warping surface of plow bottom can only just can be seen after product design creates, and the quality of its final performance must be revised parameter repeatedly by test.The modification of parameter each time, drawing all must repaint, and this carries out simultaneously with regard to three views of needs.
Summary of the invention
The objective of the invention is to: during at the design charges that exists in the design of the traditional warping surface of plow bottom, the Change In Design cost is big, the pictorial diagram of the warping surface of plow bottom can only just can be seen after product design creates, the quality of final performance must provide a kind of auxiliary design method of the warping surface of plow bottom by testing the practical problems that parameter is revised repeatedly.
The object of the present invention is achieved like this: a kind of computer-implemented method of the warping surface of plow bottom is characterized in that: the standard software that the Pro/ENGINEER system is installed on the computing machine that uses in Aided Design; According to the specific requirement of mouldboard plow, utilize analytical method tentatively to determine lead curve aperture, the ploughshare basil, single ploughshare fabric width, tilling depth, the top line maximum height of the warping surface of plow bottom; With the plough cusp is initial point, and choose right-handed coordinate system: the forward of OX axle is opposite with the working direction of plough, and the forward of OY axle points to and ploughs, and the forward of OZ axle upwards; In three dimensional space coordinate system, adopt Pro/ENGINEER to draw, form warping surface of plow bottom design sketch according to ploughshare blade line → plough body boundary curve → twice projection → generation boundary curve → curved surface → senior curved surface → border → compound curved surface → curved surface merging → curved surface optimized order; Warping surface of plow bottom design sketch is carried out the parameter correction; The revised warping surface of plow bottom design sketch of parameter is regenerated, finish the Aided Design of the warping surface of plow bottom.
Purpose advantage of the present invention is: Aided Design can be carried out different designs according to the difference of plough body manipulating object owing to adopted Pro/ENGINEER to draw, and design process designs for parametrization, and it is convenient to revise.The user just can witness itself and the same 3 d effect graph in kind with manufacturer before the product manufacturing.In conjunction with modern computer networking technology, according to user's demand, the developer can realize online modification to three-dimensional plot, and the Products Development cycle has been shortened on line operation, greatly reduces design cost.Simultaneously, design sketch can further have been optimized the visual effect of the warping surface of plow bottom intuitively from the multi-angle reflection warping surface of plow bottom.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1:
Design a concrete warping surface of plow bottom, the designing requirement of this turnplow is: the warping surface of plow bottom is the type of digging; Tilling depth reaches 180～220mm, tilling width 250mm, and coverage rate is more than 98%.
The first step: the standard software that the Pro/ENGINEER system is installed in the computing machine that uses in Aided Design earlier before design, the software version that uses in the present embodiment is Pro/ENGINEER 2001 editions, operation system of computer is windows XP, and the internal memory usage space is more than the 1.3G.
Second step:, utilize analytical method tentatively to determine lead curve aperture, the ploughshare basil, single ploughshare fabric width, tilling depth, the top line maximum height of the warping surface of plow bottom according to the specific requirement of mouldboard plow.In the present embodiment, according to the designing requirement of turnplow, determine that tentatively design parameter is: the ploughshare basil θ of the warping surface of plow bottom=36 °, single ploughshare fabric width b=250mm, tilling depth 190mm, top line maximum height Hmax get 320mm.
The 3rd step: with the plough cusp is initial point, and choose right-handed coordinate system: the forward of OX axle is opposite with the working direction of plough, and the forward of OY axle points to and ploughs, and the forward of OZ axle upwards;
The 4th step: in three dimensional space coordinate system, adopt Pro/ENGINEER to draw, form warping surface of plow bottom design sketch according to ploughshare blade line → plough body boundary curve → twice projection → generation boundary curve → curved surface → senior curved surface → border → compound curved surface → curved surface merging → curved surface optimized order.Concrete operations are: open software, set up the filename of part; Paint option by the curve grass of software then, draw the ploughshare blade line of the warping surface of plow bottom; Use twice projection option of curve of software repeatedly, finish the boundary curve of the warping surface of plow bottom that comprises that shin sword line, wing sideline, top line are formed; Use border compound curved surface option in the senior curved surface option of software repeatedly, generate the warping surface of plow bottom that comprises ploughshare, plow breast, mouldboard kicker curved surface: the curved surface of utilization software merges option, finishes the merging of ploughshare, plow breast, mouldboard kicker three part curved surfaces.Generate warping surface of plow bottom design sketch.
The 5th step: warping surface of plow bottom design sketch is carried out the parameter correction, form the final warping surface of plow bottom, finish the Aided Design of the warping surface of plow bottom.
Embodiment 2:
After finishing embodiment 1 described Aided Design, also can finish new Aided Design by revising part or all of design parameter.
Design another concrete warping surface of plow bottom, the designing requirement of this turnplow is: the warping surface of plow bottom is the type of digging; Tilling depth reaches 180～220mm, tilling width 300mm, and coverage rate is more than 98%.According to the designing requirement of this turnplow, determine that tentatively design parameter is: the ploughshare basil θ of the warping surface of plow bottom=37 °, single ploughshare fabric width b=300mm, tilling depth 220mm, top line maximum height Hmax get 380mm.Transfer akin completed warping surface of plow bottom Aided Design design sketch then (in the present embodiment, directly transfer embodiment 1 completed warping surface of plow bottom Aided Design design sketch) regenerate, link or modification one by one according to the design parameter of the new design parameter of determining again, finish the Aided Design of the warping surface of plow bottom warping surface of plow bottom design sketch.The new design parameter of determining can be the different individual parameters of design parameter with completed warping surface of plow bottom Aided Design design sketch, also can be different whole parameters.By to the interlock of design parameter or modification one by one, obtain the new warping surface of plow bottom.
Claims (3)
1, a kind of computer-implemented method of the warping surface of plow bottom is characterized in that:
The standard software of Pro/ENGINEER system is installed on the computing machine that a) uses in Aided Design;
B), utilize analytical method tentatively to determine lead curve aperture, the ploughshare basil, single ploughshare fabric width, tilling depth, the top line maximum height of the warping surface of plow bottom according to the specific requirement of mouldboard plow;
C) be initial point with the plough cusp, choose right-handed coordinate system: the forward of OX axle is opposite with the working direction of plough, and the forward of OY axle points to and ploughs, and the forward of OZ axle upwards;
D) in three dimensional space coordinate system, adopt Pro/ENGINEER to draw, form warping surface of plow bottom design sketch according to ploughshare blade line → plough body boundary curve → twice projection → generation boundary curve → curved surface → senior curved surface → border → compound curved surface → curved surface merging → curved surface optimized order;
E) warping surface of plow bottom design sketch is carried out the parameter correction, finish the Aided Design of the warping surface of plow bottom.
2, the computer-implemented method of the warping surface of plow bottom according to claim 1, it is characterized in that: the revised warping surface of plow bottom design sketch of parameter is regenerated, link or modification one by one according to the design parameter of the design parameter of determining again, finish the Aided Design of the warping surface of plow bottom warping surface of plow bottom design sketch.
3, the computer-implemented method of the warping surface of plow bottom according to claim 1 and 2, it is characterized in that: the hard disc of computer that uses in the Aided Design should have the above usage space of 1.3G, and the standard software of the Pro/ENGINEER system of installing in the computing machine obtain the support of Windows2000 and above version.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410065892XA CN100395760C (en) | 2004-12-27 | 2004-12-27 | Computer-aided design method for plow bottom surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410065892XA CN100395760C (en) | 2004-12-27 | 2004-12-27 | Computer-aided design method for plow bottom surface |
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| Publication Number | Publication Date |
|---|---|
| CN1632802A true CN1632802A (en) | 2005-06-29 |
| CN100395760C CN100395760C (en) | 2008-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410065892XA Expired - Fee Related CN100395760C (en) | 2004-12-27 | 2004-12-27 | Computer-aided design method for plow bottom surface |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104221508A (en) * | 2014-09-18 | 2014-12-24 | 河南科技大学 | Furrow plow with variable camber |
| CN113919096A (en) * | 2021-10-12 | 2022-01-11 | 中国农业大学 | High-speed plough body curved surface parametric design method based on horizontal straight line method |
-
2004
- 2004-12-27 CN CNB200410065892XA patent/CN100395760C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104221508A (en) * | 2014-09-18 | 2014-12-24 | 河南科技大学 | Furrow plow with variable camber |
| CN104221508B (en) * | 2014-09-18 | 2016-02-17 | 河南科技大学 | A kind of variable curvature mouldboard plow |
| CN113919096A (en) * | 2021-10-12 | 2022-01-11 | 中国农业大学 | High-speed plough body curved surface parametric design method based on horizontal straight line method |
| CN113919096B (en) * | 2021-10-12 | 2024-05-28 | 中国农业大学 | High-speed plough body curved surface parameterization design method based on horizontal straight element line method |
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| Publication number | Publication date |
|---|---|
| CN100395760C (en) | 2008-06-18 |
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