CN116628864A - Cross section line construction method based on whole and partial constraint - Google Patents

Cross section line construction method based on whole and partial constraint Download PDF

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CN116628864A
CN116628864A CN202310905604.XA CN202310905604A CN116628864A CN 116628864 A CN116628864 A CN 116628864A CN 202310905604 A CN202310905604 A CN 202310905604A CN 116628864 A CN116628864 A CN 116628864A
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partition
width
height
cross
section line
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CN116628864B (en
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王振
柳玉起
章志兵
韦阳
孔海骄
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Wuhan Huafeng Huizhong Technology Co ltd
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Wuhan Huafeng Huizhong Technology Co ltd
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    • G06F30/00—Computer-aided design [CAD]
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    • G06F2111/04—Constraint-based CAD
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    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

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Abstract

The invention provides a section line construction method based on whole and partial constraint, which comprises the following steps: acquiring the integral constraint of the target position, wherein the integral constraint comprises a starting point P 1 Tangential to the origin T 1 Endpoint P 2 And end point tangential T 2 According to the starting point P 1 And endpoint P 2 Determining the total width w 'and the total height h' of the section line; calculating a size parameter of each partition of the section line based on the total width w 'and the total height h' of the section line, the size parameter including the width and the height of each partition; calculating the geometric shape of each partition based on the width and the height of each partition; the size parameters and geometry parameters of each partition are adjusted to construct a section line. The invention adjusts the parameters of each partition of the section line according to the overall constraint and the local constraint of the section line of the automobile panel, can flexibly combine each partition template, has strong expression capability and expansibility, and has a definition method of each partition sizeThe formula meets the technological requirements of the automobile panel, and is convenient for quick adjustment.

Description

Cross section line construction method based on whole and partial constraint
Technical Field
The invention relates to the field of cross section line construction of automobile panel parts, in particular to a cross section line construction method based on whole and partial constraint.
Background
The automobile panel technology complementary surface has complex shape and large size, is used as an important component of the stamping technology design, and has important influence on the technology design quality and efficiency of the automobile panel. In the design process of the actual process complementary surface, a plurality of various cross section lines are needed to be inserted according to the complex product shape and deformation characteristics to control the shape of the complementary curved surface, so that the purpose of fully and uniformly deforming the material is achieved.
Because the product profile of the automobile panel is complex and the requirement on forming quality is high, reasonably designing the section lines at different positions is a complex process, various factors need to be considered, even designers with abundant experience often need to repeatedly modify the design result, and the design efficiency is low. In addition, as the required section line shape is increasingly complex, editing of the section line becomes abnormally difficult, thereby further reducing design efficiency. Therefore, there is a need in the automotive industry for an efficient and flexible method of parameterizing the process make-up surface cross-sectional line construction of an automotive panel.
In existing cross-section line design methods, a combination of straight lines and circular arcs have been employed to parametrically represent complex cross-section lines. However, constraint management among geometric elements is disordered, so that a designer has abnormal difficulty in adjusting the section line, and the efficiency is low.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a cross section line construction method based on whole and partial constraint, which comprises the following steps:
acquiring an overall constraint of the target position, wherein the overall constraint comprises a starting point P 1 Tangential to the origin T 1 Endpoint P 2 And end point tangential T 2 According to the starting point P 1 And end point P2 determination of cross sectionTotal width w 'and total height h' of the wire;
calculating a size parameter of each partition of the section line based on the total width w 'and the total height h' of the section line, the size parameter including the width and the height of each partition;
calculating the geometric shape of each partition based on the width and the height of each partition, and constructing a section line;
if the calculation of the geometric shape of each partition fails, the size parameter and the geometric shape parameter of each partition are adjusted, and a section line is constructed.
On the basis of the technical scheme, the invention can also make the following improvements.
Optionally, each partition of the section line includes a product attachment area PA, a rib area PB, and a rib area NB, and calculating the dimensional parameter of each partition of the section line based on the total width w 'and the total height h' of the section line includes:
distributing the width and the height of each partition of the section line of the target position according to the set parameter proportion based on the total width w 'and the total height h' of the section line of the target position and the width and the height of each partition template of the section line of the template;
alternatively, the width and height of the rib concave area NB are adjusted based on the total width w 'and the total height h' of the cross-sectional line of the target position, keeping the width and height of the product attachment area PA and the rib area PB unchanged.
Optionally, the distributing the width and the height of each partition of the section line of the target position according to the set parameter proportion based on the total width w 'and the total height h' of the section line of the target position and the width and the height of each partition of the section line of the template comprises:
assuming that the parameters of the template section line include a total width w, a total height h, and a width w of the segmented template PA PA The height of the partition template PA is h PA The width of the partition template NB is w NB Height is h NB The partition template PB has a width w PB Height is h PB The target position cross-sectional line parameters include a total width w ', a total height h';
calculating target bitsWidth ratio r of cross section line w =w'/w, height ratio r h =h’/h；
Calculating the width and the height of each partition of the section line of the target position according to the width ratio and the height ratio of the section line of the target position, wherein the width of the partition PA is w PA ’=w PA *r w The width of partition NB is w NB ’=w NB *r w The width of partition PB is w PB ’=w PB *r w The height of partition PA is h PA ’=h PA *r h The height of the partition NB is h NB ’=h NB *r h The height of partition PB is h PB ’=h PB *r h 。
Optionally, the adjusting the width and the height of the concave rib area NB based on the total width w 'and the total height h' of the cross-sectional line of the target position, keeping the width and the height of the product attachment area PA and the convex rib area PB unchanged includes:
assuming that the parameters of the template section line include a total width w, a total height h, and a width w of the segmented template PA PA The height of the partition template PA is h PA The width of the partition template NB is w NB Height is h NB The partition template PB has a width w PB Height is h PB The target position cross-sectional line parameters include a total width w ', a total height h';
calculating the width and height of each partition of the section line of the target position, wherein the width of the partition PA is w PA ’=w PA The width of partition NB is w NB ’=w-w PA -w NB The width of partition PB is w PB ’=w PB The height of partition PA is h PA ’=h PA The height of the partition NB is h NB ’=h NB The height of partition PB is h PB ’=h PB 。
Optionally, the calculating the geometry of each partition based on the width and the height of each partition includes:
according to the height and the width of the product additional area PA, the positions of an additional edge fillet, an additional edge line segment, an additional flange fillet and an additional flange line segment in the product additional area PA can be calculated by utilizing the tangential constraint relation between the straight line segment and the circular arc segment, wherein the end point and the direction of the additional flange line segment are used as the starting point constraint of the concave rib area NB;
according to the height and the width of the convex rib region PB, calculating the positions of a convex rib top line segment, a convex die fillet, a side wall line segment and a concave die fillet in the convex rib region PB by utilizing a tangential constraint relation between a straight line segment and an arc segment, wherein the starting point and the direction of the convex rib top line segment are used as the end point constraint of a concave rib region NB;
calculating the actual width of the concave rib area NB according to the starting point constraint and the ending point constraint of the concave rib area NB, and calculating the positions of a product round angle, a concave rib left side line segment, a concave rib left side round angle, a concave rib bottom line segment rib, a concave rib right side round angle and a concave rib right side line segment in the concave rib area NB according to the height and the actual width of the concave rib area NB by utilizing the tangential constraint relation between the straight line segment and the circular arc segment;
the target position cross section line comprises a straight line segment and an arc segment, and adjacent arc segments are connected based on the straight line segment.
Optionally, the adjusting the size parameter and the geometric parameter of each partition to construct a section line includes:
the widths and the heights of the product additional area PA, the convex rib area PB and the concave rib area NB are respectively adjusted, and the geometric shapes of the product additional area PA, the convex rib area PB and the concave rib area NB are recalculated;
the angles of the straight line segments and the radii of the arc segments in the geometric shapes of the partitions are adjusted.
Optionally, the adjusting the size parameter and the geometric parameter of each partition to construct a section line includes:
the height and width of each partition are adjusted first, and then the angles of each straight line segment and the radius of each circular arc segment in each partition are adjusted.
Optionally, the adjusting the size parameter and the geometric parameter of each partition to construct a section line includes:
the size parameters and the geometric parameters of each partition are adjusted in the order of the concave rib area NB, the convex rib area PB and the product additional area PA.
According to the section line construction method based on the whole constraint and the partial constraint, parameters of each partition of the section line are adjusted according to the whole constraint and the partial constraint of the section line of the automobile panel, each partition template can be flexibly combined, the expression capacity and the expansibility are high, the definition mode of each partition size meets the process requirement of the automobile panel, and the quick adjustment is convenient.
Drawings
FIG. 1 is a flow chart of a method for constructing a cross-sectional line based on global and local constraints;
FIG. 2 is a schematic overall restraint of a cross-sectional line of an automobile panel;
FIG. 3 is a schematic illustration of an additional zone of the product;
FIG. 4 is a schematic view of a bead region;
FIG. 5 is a schematic view of a rib concave region;
FIG. 6 is a schematic view of a combined cross-sectional line;
FIG. 7 is a schematic illustration of a first dimension defining means for the product attachment zone;
FIG. 8 is a schematic illustration of a second dimension defining means for the product attachment zone;
FIG. 9 is a schematic diagram of a third dimension defining means of the product attachment zone.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. In addition, the technical features of each embodiment or the single embodiment provided by the invention can be combined with each other at will to form a feasible technical scheme, and the combination is not limited by the sequence of steps and/or the structural composition mode, but is necessarily based on the fact that a person of ordinary skill in the art can realize the combination, and when the technical scheme is contradictory or can not realize, the combination of the technical scheme is not considered to exist and is not within the protection scope of the invention claimed.
FIG. 1 is a flow chart of a method for constructing a cross-sectional line based on global and local constraints, provided by the invention, as shown in FIG. 1, the method comprises:
step 1, obtaining the overall constraint of a target position, wherein the overall constraint comprises a starting point P 1 Tangential to the origin T 1 Endpoint P 2 And end point tangential T 2 According to the starting point P 1 And endpoint P 2 The total width w 'and the total height h' of the section line are determined.
It will be appreciated that the overall constraint of the cross-section line of the automotive panel can be seen in fig. 2, mainly comprising the overall height and overall width of the cross-section line, the tangential direction of the product face and the tangential direction of the swage face. The generated section line consists of a straight line section and an arc section, the section line needs to be kept tangential continuous with the product surface and the pressing surface at the end part, and the section line sections forming the section line need to be kept tangential continuous.
Obtaining the starting point P of the section line according to the integral constraint of the section line 1 Tangential to the origin T 1 Endpoint P 2 And end point tangential T 2 Can be based on the start point P of the section line 1 And endpoint P 2 The total width w 'and the total height h' of the section line are determined.
Step 2, calculating the dimension parameters of each partition of the section line based on the total width w 'and the total height h' of the section line, wherein the dimension parameters comprise the width and the height of each partition.
It is understood that each section of the cross-sectional line includes a product attachment area PA, a bead area PB, and a bead area NB. Wherein, the product additional area, the convex rib area and the concave rib area are respectively introduced.
Fig. 3 is a schematic view of an additional region of the product, fig. 4 is a schematic view of a convex rib region, fig. 5 is a schematic view of a concave rib region, three regions can be arbitrarily combined into a cross-sectional line, and a schematic view of a possible combined cross-sectional line can be seen in fig. 6.
It will be appreciated that the dimensional parameters of each section of the section line, including mainly the height and width of each section, can be calculated from the total height and the total width of the section line at the target location.
As an embodiment, calculating the size parameters of the respective partitions of the section line includes: distributing the width and the height of each partition of the section line of the target position according to the set parameter proportion based on the total width w 'and the total height h' of the section line of the target position and the width and the height of each partition template of the section line of the template; alternatively, the width and height of the rib concave area NB are adjusted based on the total width w 'and the total height h' of the cross-sectional line of the target position, keeping the width and height of the product attachment area PA and the rib area PB unchanged.
It can be understood that in the real calculation, according to the fact that the set partition parameters are not matched with the target position size, for example, the width of the target position should be approximately equal to the sum of the widths of the partitions, which is generally unequal, and is difficult for a user to grasp, so that the rough size of each partition needs to be determined, different rules may exist, and the height and the width of each partition are distributed according to the parameter proportion set by the user; the method can also comprise the steps of adjusting the size parameters of the concave rib area NB without changing the size parameters of the product additional area PA and the convex rib area PB.
As an embodiment, the distributing the width and the height of each partition of the section line of the target position according to the set parameter proportion based on the total width w 'and the total height h' of the section line of the target position and the width and the height of each partition of the section line of the template comprises: assuming that the parameters of the template section line include a total width w, a total height h, and a width w of the segmented template PA PA The height of the partition template PA is h PA The width of the partition template NB is w NB Height is h NB The partition template PB has a width w PB Height is h PB The target position cross-sectional line parameters include a total width w ', a total height h'; calculating the width ratio r of the cross section line of the target position w =w'/w, height ratio r h =h'/h; calculating the width and the height of each partition of the section line of the target position according to the width ratio and the height ratio of the section line of the target position, wherein the width of the partition PA is w PA ’=w PA *r w The width of partition NB is w NB ’=w NB *r w The width of partition PB is w PB ’=w PB *r w The height of partition PA is h PA ’=h PA *r h The height of the partition NB is h NB ’=h NB *r h The height of partition PB is h PB ’=h PB *r h 。
The total width w 'and the total height h' of the section line based on the target position keep the width and the height of the product additional area PA and the convex rib area PB unchanged, and adjust the width and the height of the concave rib area NB, including: assuming that the parameters of the template section line include a total width w, a total height h, and a width w of the segmented template PA PA The height of the partition template PA is h PA The width of the partition template NB is w NB Height is h NB The partition template PB has a width w PB Height is h PB The target position cross-sectional line parameters include a total width w ', a total height h'; calculating the width and height of each partition of the section line of the target position, wherein the width of the partition PA is w PA ’=w PA The width of partition NB is w NB ’=w-w PA- w NB The width of partition PB is w PB ’=w PB The height of partition PA is h PA ’=h PA The height of the partition NB is h NB ’=h NB The height of partition PB is h PB ’=h PB 。
It can be understood that the size parameters of each partition of the cross section line of the target position are distributed and calculated according to the parameter proportion set by the user, as shown in table 1.
TABLE 1
The sizes of the additional PA area and the PB area of the product are kept unchanged, and parameters of the NB area are adjusted as shown in Table 2.
TABLE 2
And step 3, calculating the geometric shape of each partition based on the width and the height of each partition.
It will be appreciated that the geometry of each partition is calculated from the height and width of each partition calculated in step 2, and the corresponding section line is constructed.
Specifically, the method comprises the following steps:
(1) According to the partition parameters of the additional area PA of the product, mainly comprising height and width, the positions of the additional edge fillet, the additional edge line segment, the additional flange fillet and the additional flange segment can be calculated by utilizing the tangential constraint relation between the straight line segment and the circular arc segment. In particular, the end points and directions of the additional flange segments will be constrained as the start points of the bead regions NB.
(2) According to the partition parameters of the convex rib PB, the convex rib PB mainly comprises a height and a width, and the positions of a convex rib top line segment, a convex die fillet, a side wall line segment and a concave die fillet can be calculated by utilizing the tangential constraint relation between a straight line segment and an arc segment. In particular, the start point and direction of the rib top line segment will be constrained as the end point of the rib concave region NB.
(3) According to the partition parameters of the concave rib area NB, the height and the width of the concave rib area NB are calculated according to the starting point constraint and the ending point constraint of the concave rib area NB, and the positions of a product fillet, a concave rib left side line segment, a concave rib left side fillet, a convex bottom line segment rib, a concave rib right side fillet and a concave rib right side line segment in the concave rib area NB are calculated by utilizing the tangential constraint relation between the straight line segment and the circular arc segment.
And step 4, if the calculation of the geometric shapes of the partitions fails, adjusting the size parameters and the geometric shape parameters of the partitions, and constructing a section line.
It can be understood that if the calculation of the geometry of each partition fails according to the parameters of each partition in step 3, the cross-section line is constructed by adjusting the size parameters and the geometry parameters of each partition, including: the widths and the heights of the product additional area PA, the convex rib area PB and the concave rib area NB are respectively adjusted, and the geometric shapes of the product additional area PA, the convex rib area PB and the concave rib area NB are recalculated; the angles of the straight line segments and the radii of the arc segments in the geometric shapes of the partitions are adjusted.
Wherein said adjusting the size parameters and geometry parameters of each partition to construct a section line comprises: the height and width of each partition are adjusted first, and then the angles of each straight line segment and the radius of each circular arc segment in each partition are adjusted.
Said adjusting the size parameters and geometry parameters of the individual partitions to construct a section line comprising: the size parameters and the geometric parameters of each partition are adjusted in the order of the concave rib area NB, the convex rib area PB and the product additional area PA.
It will be appreciated that the height and width of each partition are external parameters, which, after change, only have an effect on the external parameters of the adjacent partition. For example, after the width of the product attachment area PA is increased, only the width of the bead-recessed area NB is reduced.
After the external parameters are changed, the segment length in the partition is changed, and the angle is not changed. After the segmentation angle changes, it propagates only within the partition. For example, after the additional edge fillet is changed, the additional flange fillet is unchanged, external parameters are unchanged, and the segment length is changed. The angle of the straight line segment and the radius of the circular arc segment are intrinsic parameters and are not changed along with the change of other parameters.
When calculating the section line, unreasonable partition parameters may cause calculation failure, and then the partition parameters need to be adjusted to try again for calculation.
In the process of adjusting parameters of the partition, the adjusting sequence in the partition is as follows: partition parameters (width and height), line segment angle, fillet radius; the sequence of the partition is adjusted: the concave rib area, the convex rib area and the product additional area.
In addition, when the user adjusts the parameters of each partition, constraint rules are adopted for adjustment. Taking the product attachment area as an example, different dimensions are defined, referring to fig. 7, 8 and 9, respectively, a third definition is adopted that meets the requirements of the automobile panel process.
In FIG. 7, the width is the horizontal coordinate difference between the first and last points, and the height is the vertical coordinate difference between the first and last points, which are defined asThe characteristics are as follows: the definition is simple, the head and tail point positions are consistent with the definition of the width and the height, h PA ' does not reflect the true height of the product add-on area PA; the incompatible area disappears and if one wants to transition to disappear, the fillet radius can only be reduced to 0. In fig. 8, the width is the horizontal coordinate difference between the first and last points, and the distance from the first point to the additional flange line segment is the height. The defining mode is characterized in that: the definition is complex, and the definition of the head and tail points is inconsistent with the definition of the width and the height; h is a PA ' can reflect the true height of the product add-on area PA; compatible area disappears, h PA ' 0 is not the minimum value. In fig. 9, the width is the horizontal coordinate difference between the first and the last points, the parallel line of the additional flange fillet parallel to the tangential direction of the product surface is the height is the distance from the first point to the parallel line. The defining mode is characterized in that: the definition is complex; the head and tail point positions are inconsistent with the width and height definitions; h is a PA ' can reflect the true height of the product add-on area PA; compatible area disappears, h PA ' 0 is the minimum value.
The invention provides a cross section line construction method based on integral and local constraints, parameters of each partition of a cross section line of an automobile panel are adjusted according to the integral constraint and the local constraint of the cross section line, each partition template can be flexibly combined, the expression capacity and the expansibility are high, and the definition mode of each partition size meets the process requirement of the automobile panel, so that the quick adjustment is convenient.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (8)

1. A method of cross-sectional line construction based on global and local constraints, comprising:
acquiring an overall constraint of the target position, wherein the overall constraint comprises a starting point P 1 Tangential to the origin T 1 Endpoint P 2 And end point tangential T 2 According to the starting point P 1 And endpoint P 2 Determining the total width w 'and the total height h' of the section line;
calculating a size parameter of each partition of the section line based on the total width w 'and the total height h' of the section line, the size parameter including the width and the height of each partition;
calculating the geometric shape of each partition based on the width and the height of each partition, and constructing a section line;
if the calculation of the geometric shape of each partition fails, the size parameter and the geometric shape parameter of each partition are adjusted, and a section line is constructed.
2. The cross-sectional line construction method according to claim 1, wherein each of the sections of the cross-sectional line includes a product attachment area PA, a bead area PB, and a bead area NB, and calculating the dimensional parameters of each of the sections of the cross-sectional line based on the total width w 'and the total height h' of the cross-sectional line includes:
distributing the width and the height of each partition of the section line of the target position according to the set parameter proportion based on the total width w 'and the total height h' of the section line of the target position and the width and the height of each partition template of the section line of the template;
alternatively, the width and height of the rib concave area NB are adjusted based on the total width w 'and the total height h' of the cross-sectional line of the target position, keeping the width and height of the product attachment area PA and the rib area PB unchanged.
3. The cross-sectional line construction method according to claim 2, wherein the distributing the width and the height of each partition of the target position cross-sectional line according to the set parameter ratio based on the total width w 'and the total height h' of the target position cross-sectional line and the width and the height of each partition template of the template cross-sectional line comprises:
assuming that the parameters of the template section line include a total width w, a total height h, and a width w of the segmented template PA PA The height of the partition template PA is h PA The width of the partition template NB is w NB Height is h NB The partition template PB has a width w PB Height is h PB The target position cross-sectional line parameters include a total width w ', a total height h';
calculating the width ratio r of the cross section line of the target position w =w'/w, height ratio r h =h’/h；
Calculating the width and the height of each partition of the section line of the target position according to the width ratio and the height ratio of the section line of the target position, wherein the width of the partition PA is w PA ’=w PA *r w The width of partition NB is w NB ’=w NB *r w The width of partition PB is w PB ’=w PB *r w The height of partition PA is h PA ’=h PA *r h The height of the partition NB is h NB ’=h NB *r h The height of partition PB is h PB ’=h PB *r h 。
4. The method of constructing a cross-sectional line according to claim 2, wherein the adjusting the width and height of the rib-concave region NB based on the total width w 'and the total height h' of the cross-sectional line at the target position, keeping the width and height of the product attachment region PA and the rib-convex region PB unchanged, comprises:
assuming that the parameters of the template section line include a total width w, a total height h, and a width w of the segmented template PA PA The height of the partition template PA is h PA The width of the partition template NB is w NB Height is h NB The partition template PB has a width w PB Height is h PB The target position cross-sectional line parameters include a total width w ', a total height h';
calculating the width and height of each partition of the section line of the target position, wherein the width of the partition PA is w PA ’=w PA The width of partition NB is w NB ’=w-w PA- w NB The width of partition PB is w PB ’=w PB The height of partition PA is h PA ’=h PA The height of the partition NB is h NB ’=h NB The height of partition PB is h PB ’=h PB 。
5. The cross-sectional line construction method according to claim 2, wherein the calculating the geometry of each partition based on the width and the height of each partition comprises:
according to the height and the width of the product additional area PA, the positions of an additional edge fillet, an additional edge line segment, an additional flange fillet and an additional flange line segment in the product additional area PA can be calculated by utilizing the tangential constraint relation between the straight line segment and the circular arc segment, wherein the end point and the direction of the additional flange line segment are used as the starting point constraint of the concave rib area NB;
according to the height and the width of the convex rib region PB, calculating the positions of a convex rib top line segment, a convex die fillet, a side wall line segment and a concave die fillet in the convex rib region PB by utilizing a tangential constraint relation between a straight line segment and an arc segment, wherein the starting point and the direction of the convex rib top line segment are used as the end point constraint of a concave rib region NB;
calculating the actual width of the concave rib area NB according to the starting point constraint and the ending point constraint of the concave rib area NB, and calculating the positions of a product round angle, a concave rib left side line segment, a concave rib left side round angle, a concave rib bottom line segment, a concave rib right side round angle and a concave rib right side line segment in the concave rib area NB according to the height and the actual width of the concave rib area NB by utilizing the tangential constraint relation between the straight line segment and the circular arc segment;
the target position cross section line comprises a straight line segment and an arc segment, and adjacent arc segments are connected based on the straight line segment.
6. The method of constructing a cross-sectional line according to claim 5, wherein said adjusting the size parameter and the geometry parameter of each partition to construct a cross-sectional line comprises:
the widths and the heights of the product additional area PA, the convex rib area PB and the concave rib area NB are respectively adjusted, and the geometric shapes of the product additional area PA, the convex rib area PB and the concave rib area NB are recalculated;
the angles of the straight line segments and the radii of the arc segments in the geometric shapes of the partitions are adjusted.
7. The method of constructing a cross-sectional line according to claim 6, wherein said adjusting the size parameter and the geometry parameter of each partition to construct a cross-sectional line comprises:
the height and width of each partition are adjusted first, and then the angles of each straight line segment and the radius of each circular arc segment in each partition are adjusted.
8. The method of constructing a cross-sectional line according to claim 7, wherein said adjusting the size parameter and the geometry parameter of each partition to construct a cross-sectional line comprises:
the size parameters and the geometric parameters of each partition are adjusted in the order of the concave rib area NB, the convex rib area PB and the product additional area PA.
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