CN108920747B - Unfolding method of twisted surface plate - Google Patents
Unfolding method of twisted surface plate Download PDFInfo
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- CN108920747B CN108920747B CN201810479063.8A CN201810479063A CN108920747B CN 108920747 B CN108920747 B CN 108920747B CN 201810479063 A CN201810479063 A CN 201810479063A CN 108920747 B CN108920747 B CN 108920747B
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Abstract
The invention relates to the field of ship construction, in particular to a method for unfolding a twisted curved plate, which comprises the steps of making a real shape of a central line of a curved area of a panel through a plurality of equally divided points on the projected central line of the curved area, and further obtaining the whole real shape of the curved area; the method can be used for unfolding the twisted panel more conveniently, and is convenient for drawing by a drawing staff.
Description
Technical Field
The invention relates to the field of ship construction, in particular to a method for unfolding a twisted curved plate.
Background
The hull is internally provided with a plurality of criss-cross supporting members, particularly plate-shaped supporting members, and the two plate-shaped supporting members have the largest moment of inertia and the highest strength when the two plate-shaped supporting members are perpendicular to each other, so that the plate thickness of the plate-shaped supporting members can be properly reduced to save steel. However, since the hull has a certain degree of curvature in both the longitudinal and transverse directions, the support member is also twisted appropriately, and the twisted support member is difficult to be unfolded on the AutoCAD drawing, so that the real shape of the support member is difficult to be expressed on the drawing.
Disclosure of Invention
In order to solve the above problems, it is an object of the present invention to provide a method for unfolding a twisted plate, which can not only correctly unfold the twisted plate, but also simplify the unfolding process of the panel.
Based on this, the invention provides a method for unfolding a twisted plate, which comprises a first panel and a second panel which are connected, wherein two ends of the first panel are plane areas, the middle part of the first panel is a curved area, one side edge of the first panel is connected to the ventral surface of the second panel, and the method comprises the following steps:
step S1, projecting the center line of the first panel on the second panel and marking as a reference line, and obtaining the distortion grade difference of the curved surface area according to the included angle between the intersection line of the first panel and the second panel and the reference line;
step S2, drawing the projection of the curved surface area and the plane area on the section of one side of the first panel in the length direction according to the distortion level difference and recording the projection as a projection drawing; specifically, the projection drawing includes projection lines of two side lines of the first panel and a projection line of a center line of the first panel, and a distance between the center line and the side line in the projection drawing is equal to the distortion level difference;
step S3, a reference line used for assisting in drawing the real shape of the curved surface area is arranged beside the projection drawing, and the reference line is parallel to the projection line of the plane area in the projection drawing; marking the position of the intersection line of the curved surface area and the plane area in the reference line according to the projection drawing and marking as a starting line; dividing the arc segment of the central line into a plurality of equal parts in the projection drawing, making a perpendicular line from an equal division point of the arc segment to the reference line to be crossed with a first reference point, then making a perpendicular line of the starting line to be crossed with a second reference point by the first reference point, drawing a reference circle by taking the arc length from the equal division point to the intersection line of the curved surface area and the plane area as a radius by taking the second reference point as a circle center, linearly connecting the first reference point and the second reference point and making an extended line of the first reference point and the second reference point, wherein the intersection point of the extended line and the reference circle is a real point of the equal division point;
step S4, connecting the solid point curves to obtain a solid shape of the center line of the curved surface region, and drawing the solid shape of the curved surface region according to the solid shape of the center line of the curved surface region and the start line.
Preferably, the step S3 further includes: the number of the reference lines is three, the three reference lines are arranged in parallel, the middle reference line is used for assisting in drawing the real shape of the central line of the curved surface area, and the reference lines on the two sides are used for assisting in drawing the real shape of the two side lines of the curved surface area.
Preferably, the step S3 further includes: the distance between two adjacent reference lines is half of the width of the first panel.
Preferably, the step S3 further includes: and dividing the circular arc segment of the central line into three equal parts in the projection drawing.
The unfolding method of the twisted surface plate comprises the steps of making a real shape of a central line of a curved surface area of a panel through a plurality of equally divided points on the projected central line of the curved surface area, and further obtaining the whole real shape of the curved surface area; the method can be used for unfolding the twisted panel more conveniently, and is convenient for drawing by a drawing staff.
Drawings
FIG. 1 is a schematic cross-sectional view of a second panel of a method of unfolding a twisted panel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a first panel of a method of unfolding a twisted panel according to an embodiment of the present invention;
FIG. 3 is a schematic view showing an unfolding step of the method for unfolding a twisted plate according to an embodiment of the present invention;
FIG. 4 is a second schematic view of the unfolding step of the method for unfolding a twisted plate according to the embodiment of the present invention;
FIG. 5 is a third schematic view illustrating the unfolding step of the method for unfolding a twisted plate according to the embodiment of the present invention;
fig. 6 is a schematic view of a first panel development solid shape of a method of developing a twisted plate according to an embodiment of the present invention.
Wherein, 1, a first panel; 11. a centerline; 11a, a circular arc section; 12. a side line; 13. equally dividing points; 14. solid points; 2. a second panel; 3. a reference line; 4. a reference line; 5. a start line; 6. a reference circle; 7. a first reference point; 8. a second reference point.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1 to 6, a method of spreading the twisted plate of the present invention is schematically shown. The ship comprises a first panel 1 and a second panel 2 which are connected in a ship body, wherein two ends of the first panel 1 are plane areas, and a middle part of the first panel is a curved surface area; one side of the first panel 1 is attached to the ventral surface of the second panel 2. In the method, the curved surface area of the first panel 1 needs to be expanded to obtain the real shape.
The method comprises the following steps:
step S1, referring to fig. 1, making a projection of the center line 11 of the first panel 1 on the second panel 2 and marking as a reference line 3, and obtaining a distortion level difference of the curved surface region according to an included angle between an intersection line of the first panel 1 and the second panel 2 and the reference line 3; specifically, the difference in the distance between the two ends of the intersecting line of the first panel 1 and the second panel 2 in the length direction of the reference line 3 is the distortion level difference, and the distortion level difference is denoted as X or Y in fig. 1.
Step S2, drawing the projection of the curved surface region and the flat surface region on the cross section of the first panel 1 on one side in the length direction according to the distortion level difference and recording as a projection drawing, namely fig. 3; specifically, the projection view includes projection lines of two side lines 12 of the first panel 1 and a projection line of a center line 11 of the first panel 1, and a distance between the center line 11 and the side line 12 in the projection view is equal to the distortion level difference;
step S3, bypassing the reference line 4 of the real shape for assisting in drawing the curved surface area on the projection drawing, as shown in fig. 4, the reference line 4 is parallel to the projection line of the planar area in the projection drawing; referring to fig. 5, the position of the intersection line of the curved surface region and the planar region in the reference line 4 is marked according to the projection diagram and is marked as a start line 5; in the projection drawing, the circular arc section 11a of the central line 11 is divided into a plurality of equal parts, the perpendicular line from the equal division point 13 of the circular arc section 11a to the reference line 4 is made to intersect with the first reference point 7, then the perpendicular line from the first reference point 7 to the initial line 5 is made to intersect with the second reference point 8, the second reference point 8 is used as the circle center, the arc length from the equal division point 13 to the intersection line of the curved surface area and the plane area is used as the radius to draw the reference circle 6, the first reference point 7 and the second reference point 8 are connected in a straight line and are used as the extension line of the straight line, and the intersection point of the extension line and the reference circle 6 is the solid point 14 of the equal division point 13. The number of the reference lines 4 is three, the three reference lines 4 are arranged in parallel, the middle reference line 4 is used for assisting in drawing the solid shape of the central line 11 of the curved surface area, and the reference lines 4 on the two sides are used for assisting in drawing the solid shape of the two side lines 12 of the curved surface area. Wherein, the distance between two adjacent reference lines 4 is half of the width of the first panel 1. Preferably, the arc segment 11a of the center line 11 is divided into three equal parts in the projection view, so that the twisted plate can be correctly unfolded, and the workload can be reduced to improve the unfolding efficiency.
Step S4 is to connect the plurality of solid points 14 to obtain the solid shape of the center line 11 of the curved surface region, and to draw the solid shape of the curved surface region from the solid shape of the center line 11 of the curved surface region and the start line 5, as shown in fig. 6.
As described above, in the method for unfolding a twisted plate according to the present invention, the curved surface region of the panel is projected to form a real shape of the center line 11 of the curved surface region through the plurality of bisectors 13 on the center line 11, and then the entire real shape of the curved surface region is obtained; the method can be used for unfolding the twisted panel more conveniently, and is convenient for drawing by a drawing staff.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (1)
1. The utility model provides a method for unfolding of twisted surface board, includes the inside first panel and the second panel that link to each other of hull, first panel both ends are the plane region, and the middle part is the curved surface region, a side of first panel connect in on the ventral surface of second panel, its characterized in that includes following step:
step S1, projecting the center line of the first panel on the second panel and marking as a reference line, and obtaining the distortion grade difference of the curved surface area according to the included angle between the intersection line of the first panel and the second panel and the reference line;
step S2, drawing the projection of the curved surface area and the plane area on the section of one side of the first panel in the length direction according to the distortion level difference and recording the projection as a projection drawing; specifically, the projection drawing includes projection lines of two side lines of the first panel and a projection line of a center line of the first panel, and a distance between the center line and the side line in the projection drawing is equal to the distortion level difference;
step S3, forming reference lines beside the projection drawing for assisting in drawing the real shape of the curved surface area, where the reference lines are parallel to the projection lines of the planar area in the projection drawing, the number of the reference lines is three, the three reference lines are arranged in parallel, the distance between two adjacent reference lines is half of the width of the first panel, the reference line in the middle is used for assisting in drawing the real shape of the center line of the curved surface area, and the reference lines on both sides are used for assisting in drawing the real shape of the two side lines of the curved surface area; marking the position of the intersection line of the curved surface area and the plane area in the reference line according to the projection drawing and marking as a starting line; dividing the circular arc segment of the central line into trisections in the projection drawing, making a perpendicular line from a bisecting point of the circular arc segment to the reference line to be crossed at a first reference point, then making a perpendicular line from the first reference point to be crossed at a second reference point, taking the arc length from the bisecting point to the intersection line of the curved surface region and the plane region as a radius as a circle center to draw a reference circle, connecting the first reference point and the second reference point in a straight line and making an extension line of the first reference point and the second reference point, wherein the intersection point of the extension line and the reference circle is a real point of the bisecting point;
step S4, connecting the solid point curves to obtain a solid shape of the center line of the curved surface region, and drawing the solid shape of the curved surface region according to the solid shape of the center line of the curved surface region and the start line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810479063.8A CN108920747B (en) | 2018-05-18 | 2018-05-18 | Unfolding method of twisted surface plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810479063.8A CN108920747B (en) | 2018-05-18 | 2018-05-18 | Unfolding method of twisted surface plate |
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| CN108920747A CN108920747A (en) | 2018-11-30 |
| CN108920747B true CN108920747B (en) | 2022-09-02 |
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| CN201810479063.8A Active CN108920747B (en) | 2018-05-18 | 2018-05-18 | Unfolding method of twisted surface plate |
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| CN116502301B (en) * | 2023-06-30 | 2024-03-22 | 深圳市华阳国际工程设计股份有限公司 | Display distortion correction method for DWG drawing in WEB end rendering |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4825377A (en) * | 1985-02-28 | 1989-04-25 | Fanuc Ltd | Complex curved surface creation method |
| CN104723316A (en) * | 2015-03-30 | 2015-06-24 | 沈阳飞机工业（集团）有限公司 | Design method for hook face fillet part marking template |
| CN107274489A (en) * | 2017-05-09 | 2017-10-20 | 浙江大学 | A kind of guiding collimation method free form surface Meshing Method based on Doubly curved surfaces |
-
2018
- 2018-05-18 CN CN201810479063.8A patent/CN108920747B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4825377A (en) * | 1985-02-28 | 1989-04-25 | Fanuc Ltd | Complex curved surface creation method |
| CN104723316A (en) * | 2015-03-30 | 2015-06-24 | 沈阳飞机工业（集团）有限公司 | Design method for hook face fillet part marking template |
| CN107274489A (en) * | 2017-05-09 | 2017-10-20 | 浙江大学 | A kind of guiding collimation method free form surface Meshing Method based on Doubly curved surfaces |
Non-Patent Citations (2)
| Title |
|---|
| 扭曲箱形构件的空间坐标表示法;范重等;《建筑结构学报》;20070405(第02期);全文 * |
| 直素线三元流动叶片的展开;唐晓初;《抚顺石油学院学报》;19951225(第04期);全文 * |
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Application publication date: 20181130 Assignee: Zhanjiang Nanhai Shipbuilding High tech Service Co.,Ltd. Assignor: CSSC HUANGPU WENCHONG SHIPBUILDING Co.,Ltd. Contract record no.: X2023980048822 Denomination of invention: Unfolding method of twisted panel Granted publication date: 20220902 License type: Common License Record date: 20231130 |
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