CN116738579A - Automatic construction method and system for parting line of automobile panel - Google Patents
Automatic construction method and system for parting line of automobile panel Download PDFInfo
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Abstract
The application discloses an automatic construction method and system for a parting line of an automobile covering part, wherein the method comprises the following steps: projecting the boundary line of the automobile panel based on a preset local coordinate system, and performing offset processing on the projected boundary line to obtain an offset curve; simplifying the bias curve based on a plurality of simplification algorithms to obtain a simplified curve; chamfering the sharp corner part of the simplified curve; projecting the rounded simplified curve to a material pressing surface of the covering piece to obtain a parting line of the covering piece; therefore, the parting line is automatically generated by carrying out projection, offset, simplification and rounding treatment on the boundary line of the automobile panel, the experience dependence on designers is eliminated, the design efficiency is improved, and meanwhile, the parting line is simplified, so that the later adjustment of the parting line is more flexible and convenient.
Description
Technical Field
The application relates to the technical field of automobile covering parts, in particular to an automatic construction method and system for a parting line of an automobile covering part.
Background
The parting line is an important parameter in the design process of the process supplement surface of the automobile panel, and the shape of the parting line directly influences the shape of the process supplement surface and further influences the forming result of a later-stage automobile panel product. The design of the parting line is generally to refer to the boundary line of the product, firstly, a curve similar to the shape of the parting line in the stamping direction is constructed, and then the parting line is obtained by projecting the curve to the stamping surface. However, there are a great deal of changes in the design process of the automobile panel, and for the parting line, after the preliminary design is completed, the later stage is generally changed frequently because of the process requirement, so the design requirement of the parting line is convenient and flexible to change later.
At present, most of the design of parting lines is gradually designed by utilizing modeling software depending on designers, so that the experience is strong, the automobile panel is various and complex in shape, and the design process consumes a great deal of time and energy, so that the design efficiency of the die surface is affected. In addition, the mode of manual design is complicated in the later adjustment process.
Therefore, in order to solve the above problems, an automatic design scheme of the parting line of the automobile panel is needed to reduce the difficulty of later adjustment, so that the adjustment is more flexible.
Disclosure of Invention
The application provides an automatic construction method and system for a parting line of an automobile panel, which are used for automatically generating the parting line by carrying out projection, offset, simplification and rounding treatment on the boundary line of the automobile panel, so that the experience dependence on a designer is eliminated, the design efficiency is improved, and meanwhile, the parting line is simplified, so that the later adjustment of the parting line is more flexible and convenient.
In a first aspect, an automatic construction method for a parting line of an automobile panel is provided, specifically including the following steps:
projecting the boundary line of the automobile panel based on a preset local coordinate system, and performing offset processing on the projected boundary line to obtain an offset curve;
simplifying the bias curve based on a plurality of simplification algorithms to obtain a simplified curve;
chamfering the sharp corner part of the simplified curve;
and projecting the rounded simplified curve to a pressing surface of the covering part to obtain a parting line of the covering part.
According to a first aspect, in a first possible implementation manner of the first aspect, the step of projecting the boundary line of the automobile panel based on the preset local coordinate system and performing the biasing process on the projected boundary line to obtain the biasing curve specifically includes the following steps:
dispersing boundary lines of the automobile panel based on a curve dispersing algorithm to obtain boundary dispersing points;
projecting the boundary discrete points to an XY plane of a preset local coordinate system to obtain boundary projection points;
and biasing the boundary projection points based on a rolling algorithm to obtain bias points, and interpolating the bias points to obtain a bias curve.
In a second possible implementation manner of the first aspect, the step of simplifying the bias curve based on a plurality of simplification algorithms to obtain a simplified curve specifically includes the following steps:
segmenting the bias curve according to curvature, and preliminarily simplifying the bias curve according to the segmentation point position and the segmentation interval type of the bias curve;
and simplifying the offset curve after preliminary simplification again based on a preset distance value to obtain a simplified curve.
In a third possible implementation manner of the first aspect according to the second possible implementation manner of the first aspect, the step of "segmenting the bias curve according to a curvature" specifically includes the following steps:
step one, calculating curvature or tangential direction of each bias point in a bias curve;
selecting one of the bias points in the bias curve as an initial point;
step three, traversing the rest bias points in sequence, and judging the other bias point as a segmentation point when detecting that the curvature change value between the curvature at the initial point and the curvature at the other bias point is equal to the curvature threshold value; or when the tangential included angle between the tangent line at the initial point and the tangent line at the other offset point is detected to be equal to the included angle threshold value, judging the other offset point as a segmentation point;
and step four, taking another offset point as a first segmentation point, and segmenting the offset curve according to the step three.
In a fourth possible implementation manner of the first aspect according to the second possible implementation manner of the first aspect, the step of "initially simplifying the bias curve according to the position of the segmentation point and the type of the segmentation interval of the bias curve" specifically includes the following steps:
acquiring a line segment interval when the curvature change value between two segmentation points in the bias curve is smaller than a curvature threshold value;
detecting whether end point extension lines of two adjacent line segment intervals are intersected or not, and if so, connecting the two adjacent line segment intervals through the end point extension lines; if the two sections are not intersected, the end points of the adjacent two line section sections are connected through straight lines.
In a fifth possible implementation manner of the first aspect according to the fourth possible implementation manner of the first aspect, a curvature change value between two segment points in the bias curveThe calculation formula of (2) is as follows:
；
in the method, in the process of the application,maximum curvature radius in the interval corresponding to the two segmentation points; />For two segmentation pointsCorresponding to the smallest radius of curvature in the interval.
In a sixth possible implementation manner of the first aspect according to the second possible implementation manner of the first aspect, the step of simplifying the offset curve after the preliminary simplification again based on the preset distance value to obtain a simplified curve specifically includes the following steps:
optionally selecting three continuous bias points in the initially simplified bias curve as a first point group, and constructing a first line segment between the head bias points and the tail bias points in the first point group;
when the distance value from the middle offset point of the first point group to the perpendicular line segment of the first line segment is detected to be smaller than a preset distance value, regarding the next offset point adjacent to the tail offset point in the first point group and the head offset point in the first point group as a second point group;
and calculating the distance value of the vertical line segment of the second line segment constructed by the two middle offset points in the second point group to the head offset points and the tail offset points of the second point group respectively, removing the middle offset point in the second point group corresponding to one vertical line segment distance value when detecting that the distance value of one vertical line segment is larger than or equal to a preset distance value, regarding the middle offset point in the second point group corresponding to the other vertical line segment distance value as a new head offset point, sequentially selecting three consecutive offset points containing the new head offset point until all the offset points of the offset curve are completely selected and calculated, and obtaining a simplified curve.
In a seventh possible implementation manner of the first aspect, according to the first aspect, the step of "rounding the sharp corner portion of the simplified curve" specifically includes the following steps:
setting any line segment interval in the simplified curve as a sample line segment;
obtaining tangent points of initial rounds corresponding to sharp corner parts at two ends of the sample line segment one by one on the sample line segment respectively;
when the sum of the distances between the two tangent points and the end points of the corresponding sharp corner parts at one end is detected to be smaller than or equal to the length value of the sample line segment, respectively carrying out rounding treatment on the sharp corner parts at the two ends of the sample line segment according to two initial rounding radii;
and when the sum of the distances between the two tangent points and the end points of the corresponding sharp angle part at one end is detected to be larger than the length value of the interval of one line segment, rounding the sharp angle parts at the two ends of the sample line segment based on the middle point of the sample line segment.
In an eighth possible implementation manner of the first aspect according to the seventh possible implementation manner of the first aspect, the calculation formula of the initial rounding radius R is as follows:
；
wherein n is the number of offset points of one line segment interval of the sample line segment; r is R i Is the radius of curvature at all offset points within the segment of one side thereof.
In a second aspect, there is also provided an auto-construction system for a split line of an automotive panel, comprising:
the bias module is used for projecting the boundary line of the automobile panel based on a preset local coordinate system and carrying out bias processing on the projected boundary line to obtain a bias curve;
the simplifying module is in communication connection with the biasing module and is used for simplifying the biasing curve based on a plurality of simplifying algorithms to obtain a simplified curve;
the rounding module is in communication connection with the simplifying module and is used for rounding the sharp corner part of the simplifying curve; the method comprises the steps of,
and the projection module is in communication connection with the rounding module and is used for projecting the simplified curve after the rounding treatment to the material pressing surface of the covering part to obtain a parting line of the covering part.
Compared with the prior art, the application has the following advantages: the boundary line of the automobile panel is projected, biased, simplified and rounded to automatically generate the parting line, so that the experience dependence on designers is eliminated, the design efficiency is improved, and meanwhile, the parting line is simplified, so that the later adjustment of the parting line is more flexible and convenient; therefore, the application has better universality and is easy to realize in engineering application.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of an automatic construction method of a parting line of an automobile panel according to the present application;
FIG. 2 is a schematic diagram of a preset local coordinate system according to the present application;
fig. 3 is a schematic view of the boundary line discrete points of the automobile panel of the present application;
FIG. 4 is a schematic view of the projection of discrete points onto a predetermined local coordinate system XY plane according to the present application;
FIG. 5 is a schematic diagram of bias curve generation of the present application;
FIG. 6 is a schematic illustration of a bias curve segment of the present application;
FIG. 7 is a schematic illustration of a first scenario of the line segment extension of the present application;
FIG. 8 is a schematic diagram of a second scenario of the line segment extension of the present application;
FIG. 9 is a simplified schematic of the offset curve of the present application after a line segment is extended;
FIG. 10 is a schematic flow diagram of a bias curve again simplified in accordance with the present application;
FIG. 11 is a schematic representation of the handling of the rounded corner interference situation of the present application;
FIG. 12 is a schematic view of the cover parting line of the present application;
fig. 13 is a schematic structural view of an automatic construction system for a parting line of an automobile panel according to the present application.
Detailed Description
Reference will now be made in detail to the present embodiments of the application, examples of which are illustrated in the accompanying drawings. While the application will be described in conjunction with the specific embodiments, it will be understood that they are not intended to limit the application to the described embodiments. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the application as defined by the appended claims. It should be noted that the method steps described herein may be implemented by any functional block or arrangement of functions, and any functional block or arrangement of functions may be implemented as a physical entity or a logical entity, or a combination of both.
The present application will be described in further detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to understand the application better.
Note that: the examples to be described below are only one specific example, and not as limiting the embodiments of the present application necessarily to the following specific steps, values, conditions, data, sequences, etc. Those skilled in the art can, upon reading the present specification, make and use the concepts of the application to construct further embodiments not mentioned in the specification.
Referring to fig. 1, an embodiment of the present application provides an automatic construction method for a parting line of an automobile panel, which specifically includes the following steps:
s100, projecting a boundary line of an automobile panel based on a preset local coordinate system, and performing offset processing on the projected boundary line to obtain an offset curve;
s200, simplifying the bias curve based on a plurality of simplification algorithms to obtain a simplified curve;
s300, chamfering is carried out on the sharp corner part of the simplified curve;
s400, projecting the simplified curve after the rounding treatment to a material pressing surface of the covering piece to obtain a parting line of the covering piece.
Specifically, in the embodiment, the boundary line of the automobile panel is projected, biased, simplified and rounded to automatically generate the parting line, so that the dependence on experience of a designer is eliminated, the design efficiency is improved, and meanwhile, the parting line is simplified, so that the later adjustment of the parting line is more flexible and convenient; therefore, the application has better universality and is easy to realize in engineering application.
Preferably, in another embodiment of the present application, the step of "S100, projecting the boundary line of the automobile panel based on the preset local coordinate system and performing the offset processing on the projected boundary line to obtain the offset curve" specifically includes the following steps:
s110, discretizing the boundary line of the automobile panel based on a curve discretization algorithm to obtain boundary discrete points;
s120, projecting the boundary discrete points to an XY plane of a preset local coordinate system to obtain boundary projection points;
and S130, biasing the boundary projection points based on a rounding algorithm to obtain bias points, and interpolating the bias points to obtain a bias curve.
Specifically, in this embodiment, the method for constructing the preset local coordinate system is as follows, specifically referring to fig. 2: taking a point P at the central position of the automobile panel, and moving a specified distance along the stamping direction to obtain a coordinate system origin O; the positive z_dir of the z axis of the stamping direction coordinate system is any direction dir0; cross multiplying z_dir with dir0 to obtain y-axis positive y_dir; y_dir is cross multiplied with z_dir to give the x-axis forward direction x_dir.
The boundary line of the automobile panel is discretized based on a curve discretization algorithm to obtain boundary discrete points, and the boundary discrete points are converted into a preset local coordinate system to obtain a point array, as shown in fig. 3The method comprises the steps of carrying out a first treatment on the surface of the For the converted discrete point coordinatesThe z-axis coordinate is set to 0, and the projection point row on the xy plane can be obtained +.>See in particular fig. 4; and then a rounding algorithm is applied to the projection point array on the xy plane to obtain a series of offset points, and an offset curve is obtained by interpolation of the offset points, which is shown in fig. 5. In practical application, equidistant offset or variable-pitch offset can be adopted during offset according to requirements.
Preferably, in another embodiment of the present application, the step of simplifying the bias curve to obtain a simplified curve based on a plurality of simplifying algorithms in S200 specifically includes the following steps:
s210, segmenting the offset curve according to curvature, and preliminarily simplifying the offset curve according to the segmentation point position and the segmentation interval type of the offset curve;
s220, simplifying the offset curve after preliminary simplification again based on a preset distance value to obtain a simplified curve.
Specifically, in the embodiment, the offset curve model is further simplified into the line segment and the circular arc, so that the later adjustment difficulty can be reduced, and the adjustment is more flexible.
Preferably, in another embodiment of the present application, the step of "S210, segmenting the bias curve according to curvature" specifically includes the steps of:
step one, calculating curvature or tangent line at each bias point in a bias curve;
selecting one of the bias points in the bias curve as an initial point;
step three, traversing the rest bias points in sequence, and judging the other bias point as a segmentation point when detecting that the curvature change value between the curvature at the initial point and the curvature at the other bias point is equal to the curvature threshold value; or when the tangential included angle between the tangent line at the initial point and the tangent line at the other offset point is detected to be equal to the included angle threshold value, judging the other offset point as a segmentation point;
and step four, taking another offset point as a first segmentation point, and segmenting the offset curve according to the step three.
Specifically, in the present embodiment, the curvature or tangential direction at each bias point in the bias curve is calculated; one of the bias points in the bias curve is selected as an initial point, the point is traversed backwards, and the initial point is continuously updated to the maximum radius of curvature in the interval corresponding to the other bias pointAnd minimum radius of curvature +.>The method comprises the steps of carrying out a first treatment on the surface of the Judging whether the current point can be used as a segmentation point according to the following rule:
let the curvature threshold value be，/>In the formula (I), the tangential included angle between the section initial point and the other offset point is angle. If->Or->Is greater than->The section is a circular arc section, otherwise, a line section.
For a segmented interval, calculating the average value of the curvature radius at all bias points in the segmented interval:formula (II);
the above steps are repeated with the other bias point as the first segment point, so as to complete the segmentation of the whole bias curve, as shown in fig. 6.
Preferably, in another embodiment of the present application, the step of "S210, initially simplifying the bias curve according to the position of the segment point and the type of the segment interval of the bias curve", specifically includes the following steps:
acquiring a line segment interval when the curvature change value between two segmentation points in the bias curve is smaller than a curvature threshold value;
detecting whether end point extension lines of two adjacent line segment intervals are intersected or not, and if so, connecting the two adjacent line segment intervals through the end point extension lines; if the two sections are not intersected, the end points of the adjacent two line section sections are connected through straight lines.
Specifically, in this embodiment, all line segment intervals are obtained, the two ends of the line segment intervals are connected to create a line segment, the arc area is not created, and the bias curve is simplified as shown in fig. 6;
detecting whether end point extension lines of two adjacent line segment sections are intersected, if so, connecting the two adjacent line segment sections through the end point extension lines, specifically referring to fig. 7, and for the two adjacent line segment sections L1 and L2, if the intersection point is on an L1 forward extension line and an L2 reverse extension line, replacing an arc area between the L1 and L2 with the end point extension line; if the two segments do not intersect, the end points of the adjacent two segment sections are connected through straight lines, and as shown in fig. 8, if the end point extension lines of the L1 and the L2 do not want to intersect or if the intersection points of the L1 and the L2 do not exist, the L1 and the L2 are directly connected.
The line segment intervals are processed sequentially, and the offset curve is further simplified into a multi-segment line formed by the adjacent line segments from the beginning to the end, which is a first preliminary simplified mode, and particularly, the offset curve is shown in fig. 9.
Preferably, in another embodiment of the present application, the step of "S220, based on a preset distance value, performing simplification again on the offset curve after preliminary simplification to obtain a simplified curve" specifically includes the following steps:
optionally selecting three continuous bias points in the initially simplified bias curve as a first point group, and constructing a first line segment between the head bias points and the tail bias points in the first point group;
when the distance value from the middle offset point of the first point group to the perpendicular line segment of the first line segment is detected to be smaller than a preset distance value, regarding the next offset point adjacent to the tail offset point in the first point group and the head offset point in the first point group as a second point group;
and calculating the distance value of the vertical line segment of the second line segment constructed by the two middle offset points in the second point group to the head offset points and the tail offset points of the second point group respectively, removing the middle offset point in the second point group corresponding to one vertical line segment distance value when detecting that the distance value of one vertical line segment is larger than or equal to a preset distance value, regarding the middle offset point in the second point group corresponding to the other vertical line segment distance value as a new head offset point, sequentially selecting three consecutive offset points containing the new head offset point until all the offset points of the offset curve are completely selected and calculated, and obtaining a simplified curve.
Specifically, in this embodiment, referring specifically to fig. 10, three bias points optionally consecutive in the initially simplified bias curve are regarded as a first point group, and from the first bias point, the following points are traversed; in each point group, a line segment is constructed between the two head-to-tail offset points, and the distance di between the middle offset point between the two head-to-tail offset points and the perpendicular line segment of the line segment is calculated; if the distance di is greater than or equal to a preset distance value Sag, removing the corresponding middle bias point, thereby completing simplification; repeating the steps until the second simplification is completed for all the bias point columns.
Preferably, in another embodiment of the present application, the step of "rounding off the sharp corner of the simplified curve" in S300 specifically includes the steps of:
s310, setting any line segment interval in the simplified curve as a sample line segment;
s320, obtaining tangent points of initial rounds corresponding to sharp corner parts at two ends of the sample line segment one by one on the sample line segment respectively;
s330, when the sum of the distances between the two tangent points and the end points of the corresponding sharp corner parts at one end is detected to be smaller than or equal to the length value of the sample line segment, respectively rounding the sharp corner parts at the two ends of the sample line segment according to two initial rounding radii;
and S340, when the sum of the distances between the two tangent points and the end points of the corresponding sharp angle parts at one end is detected to be larger than the length value of the interval of one line segment, rounding the sharp angle parts at the two ends of the sample line segment based on the middle point of the sample line segment.
The calculation formula of the initial rounding radius R is as follows:
formula (II);
wherein n is the number of offset points of one line segment interval of the sample line segment; r is R i Is the radius of curvature at all offset points within the segment of one side thereof.
Specifically, in the present embodiment, as shown in fig. 11, the initial rounding radius R obtained as described above is rounded at the tip end portions of the sample line segment. Because two sharp corner parts are introduced, the radius of the rounding of the two sharp corner parts is respectively the average radius of curvature calculated by the second section of the two side line sections of the sample line section; if the rounding is directly carried out according to the calculated two average curvature radiuses, interference occurs, so that in order to solve the problem of rounding interference, the following method is adopted:
starting from a first line segment L1, setting the length of the line segment L1 as len, and calculating the initial rounding radius r1 and r2 when rounding sharp corner parts at two ends, wherein the distance dis1 and dis2 between the position of a tangent point and the corresponding rounding end point; if dis1+ dis2 is less than or equal to len, indicating that no interference exists, and continuing to round the next line segment; if dis1+ dis2>len, the description will be made of the interference, the midpoint P of the line segment is calculated, and when the calculated tangent point is at the midpoint P of the line segment, the rounding radii of the two sharp corner portions are respectively，The final two sharp corner portions can be rounded with a radius of +.>、。
Finally, projecting the rounded simplified curve to a pressing surface of the covering part to obtain a parting line of the covering part, and particularly referring to fig. 12.
Referring also to fig. 13, an embodiment of the present application further provides an automatic system for constructing a parting line of an automobile panel, including:
the bias module is used for projecting the boundary line of the automobile panel based on a preset local coordinate system and carrying out bias processing on the projected boundary line to obtain a bias curve;
the simplifying module is in communication connection with the biasing module and is used for simplifying the biasing curve based on a plurality of simplifying algorithms to obtain a simplified curve;
the rounding module is in communication connection with the simplifying module and is used for rounding the sharp corner part of the simplifying curve; the method comprises the steps of,
and the projection module is in communication connection with the rounding module and is used for projecting the simplified curve after the rounding treatment to the material pressing surface of the covering part to obtain a parting line of the covering part.
Therefore, the application automatically generates the parting line by carrying out projection, offset, simplification and rounding treatment on the boundary line of the automobile panel, gets rid of experience dependence on designers, provides design efficiency, and simplifies the parting line at the same time, so that the later adjustment of the parting line is more flexible and convenient; therefore, the application has better universality and is easy to realize in engineering application.
Specifically, the present embodiment corresponds to the foregoing method embodiments one by one, and the functions of each module are described in detail in the corresponding method embodiments, so that a detailed description is not given.
Based on the same inventive concept, the embodiments of the present application also provide a computer-readable storage medium, on which a computer program is stored, which when being executed by a processor implements all or part of the method steps of the above method.
The present application may be implemented by implementing all or part of the above-described method flow, or by instructing the relevant hardware by a computer program, which may be stored in a computer readable storage medium, and which when executed by a processor, may implement the steps of the above-described method embodiments. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the content of the computer readable medium can be appropriately increased or decreased according to the requirements of the jurisdiction's jurisdiction and the patent practice, for example, in some jurisdictions, the computer readable medium does not include electrical carrier signals and telecommunication signals according to the jurisdiction and the patent practice.
Based on the same inventive concept, the embodiment of the application also provides an electronic device, which comprises a memory and a processor, wherein the memory stores a computer program running on the processor, and the processor executes the computer program to realize all or part of the method steps in the method.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being a control center of the computer device, and the various interfaces and lines connecting the various parts of the overall computer device.
The memory may be used to store computer programs and/or modules, and the processor implements various functions of the computer device by running or executing the computer programs and/or modules stored in the memory, and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function (e.g., a sound playing function, an image playing function, etc.); the storage data area may store data (e.g., audio data, video data, etc.) created according to the use of the handset. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, server, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), servers and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. An automatic construction method of a parting line of an automobile panel is characterized by comprising the following steps:
projecting the boundary line of the automobile panel based on a preset local coordinate system, and performing offset processing on the projected boundary line to obtain an offset curve;
simplifying the bias curve based on a plurality of simplification algorithms to obtain a simplified curve;
chamfering the sharp corner part of the simplified curve;
and projecting the rounded simplified curve to a pressing surface of the covering part to obtain a parting line of the covering part.
2. The automatic construction method of a parting line of an automobile panel according to claim 1, wherein the step of projecting a boundary line of the automobile panel based on a preset local coordinate system and performing a bias process on the projected boundary line to obtain a bias curve comprises the steps of:
dispersing boundary lines of the automobile panel based on a curve dispersing algorithm to obtain boundary dispersing points;
projecting the boundary discrete points to an XY plane of a preset local coordinate system to obtain boundary projection points;
and biasing the boundary projection points based on a rolling algorithm to obtain bias points, and interpolating the bias points to obtain a bias curve.
3. The automatic construction method of a parting line of an automobile panel according to claim 1, wherein the step of simplifying the offset curve based on a plurality of simplification algorithms to obtain a simplified curve comprises the steps of:
segmenting the bias curve according to curvature, and preliminarily simplifying the bias curve according to the segmentation point position and the segmentation interval type of the bias curve;
and simplifying the offset curve after preliminary simplification again based on a preset distance value to obtain a simplified curve.
4. A method for automatically constructing a parting line of an automobile panel according to claim 3, wherein said step of segmenting said offset curve according to a curvature comprises the steps of:
step one, calculating curvature or tangential direction of each bias point in a bias curve;
selecting one of the bias points in the bias curve as an initial point;
step three, traversing the rest bias points in sequence, and judging the other bias point as a segmentation point when detecting that the curvature change value between the curvature at the initial point and the curvature at the other bias point is equal to the curvature threshold value; or when the tangential included angle between the tangent line at the initial point and the tangent line at the other offset point is detected to be equal to the included angle threshold value, judging the other offset point as a segmentation point;
and step four, taking another offset point as a first segmentation point, and segmenting the offset curve according to the step three.
5. The automatic construction method of a parting line of an automobile panel according to claim 3, wherein the step of preliminarily simplifying the offset curve according to the position of the parting point and the type of the parting section of the offset curve comprises the steps of:
acquiring a line segment interval when the curvature change value between two segmentation points in the bias curve is smaller than a curvature threshold value;
detecting whether end point extension lines of two adjacent line segment intervals are intersected or not, and if so, connecting the two adjacent line segment intervals through the end point extension lines; if the two sections are not intersected, the end points of the adjacent two line section sections are connected through straight lines.
6. The automatic construction method of a parting line of an automobile panel according to claim 5, wherein a curvature change value between two segment points in the offset curveThe calculation formula of (2) is as follows:
；
in the method, in the process of the application,maximum curvature radius in the interval corresponding to the two segmentation points; />The minimum curvature radius in the interval corresponding to the two segmentation points.
7. The automatic construction method of a parting line of an automobile panel according to claim 3, wherein the step of simplifying the offset curve again based on a preset distance value after preliminary simplification to obtain a simplified curve comprises the steps of:
optionally selecting three continuous bias points in the initially simplified bias curve as a first point group, and constructing a first line segment between the head bias points and the tail bias points in the first point group;
when the distance value from the middle offset point of the first point group to the perpendicular line segment of the first line segment is detected to be smaller than a preset distance value, regarding the next offset point adjacent to the tail offset point in the first point group and the head offset point in the first point group as a second point group;
and calculating the distance value of the vertical line segment of the second line segment constructed by the two middle offset points in the second point group to the head offset points and the tail offset points of the second point group respectively, removing the middle offset point in the second point group corresponding to one vertical line segment distance value when detecting that the distance value of one vertical line segment is larger than or equal to a preset distance value, regarding the middle offset point in the second point group corresponding to the other vertical line segment distance value as a new head offset point, sequentially selecting three consecutive offset points containing the new head offset point until all the offset points of the offset curve are completely selected and calculated, and obtaining a simplified curve.
8. The automatic construction method of a parting line of an automobile panel according to claim 1, wherein the step of chamfering the sharp corner portion of the simplified curve comprises the steps of:
setting any line segment interval in the simplified curve as a sample line segment;
obtaining tangent points of initial rounds corresponding to sharp corner parts at two ends of the sample line segment one by one on the sample line segment respectively;
when the sum of the distances between the two tangent points and the end points of the corresponding sharp corner parts at one end is detected to be smaller than or equal to the length value of the sample line segment, respectively carrying out rounding treatment on the sharp corner parts at the two ends of the sample line segment according to two initial rounding radii;
and when the sum of the distances between the two tangent points and the end points of the corresponding sharp angle part at one end is detected to be larger than the length value of the interval of one line segment, rounding the sharp angle parts at the two ends of the sample line segment based on the middle point of the sample line segment.
9. The automatic construction method of an automobile panel parting line according to claim 8, wherein the initial fillet radius R is calculated as follows:
；
wherein n is the number of offset points of one line segment interval of the sample line segment; r is R i Is the radius of curvature at all offset points within the segment of one side thereof.
10. An automatic molding line construction system for an automobile panel, comprising:
the bias module is used for projecting the boundary line of the automobile panel based on a preset local coordinate system and carrying out bias processing on the projected boundary line to obtain a bias curve;
the simplifying module is in communication connection with the biasing module and is used for simplifying the biasing curve based on a plurality of simplifying algorithms to obtain a simplified curve;
the rounding module is in communication connection with the simplifying module and is used for rounding the sharp corner part of the simplifying curve; the method comprises the steps of,
and the projection module is in communication connection with the rounding module and is used for projecting the simplified curve after the rounding treatment to the material pressing surface of the covering part to obtain a parting line of the covering part.
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