CN115205471A - Labeling method and system suitable for automatic drawing of assembly modeling - Google Patents
Labeling method and system suitable for automatic drawing of assembly modeling Download PDFInfo
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- CN115205471A CN115205471A CN202211106679.3A CN202211106679A CN115205471A CN 115205471 A CN115205471 A CN 115205471A CN 202211106679 A CN202211106679 A CN 202211106679A CN 115205471 A CN115205471 A CN 115205471A
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
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Abstract
The invention relates to the technical field of drawing marking, and discloses a marking method and a system suitable for automatic drawing of assembly modeling; the method comprises the following steps: establishing a global coordinate system and a local coordinate system in the three-dimensional model according to the positioning relation among the parts; establishing a same coordinate system in the two-dimensional model; establishing a three-dimensional model after the parts are assembled to generate a three-dimensional file according to the positioning relation among the parts; traversing the three-dimensional file to find the positioning relation among the parts; establishing a positioning tree according to the positioning relation among the parts; traversing the three-dimensional file to find a two-dimensional model corresponding to each part; according to the positioning relation among all parts in the positioning tree, the two-dimensional models of all parts are laid out according to the coordinate systems of all parts, and a two-dimensional graph is generated; traversing the two-dimensional graph, and recording a coordinate system required by the two-dimensional model positioning of each part according to the positioning tree; and finding a coordinate system corresponding to the current part two-dimensional model, and marking the nonzero size of the part by taking the original point of the coordinate system as the starting point of marking.
Description
Technical Field
The invention relates to the technical field of drawing marking, in particular to a marking method and system suitable for automatic drawing of assembly modeling.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
In the context of smart manufacturing, the manufacturing industry has a strong demand for industrial software. The industrial software such as CAD (computer aided design) and the like is a crown in industrial software, is a key point for improving the product development capacity and efficiency, and is a short board and a bottleneck of the current industrial software.
The design of the pressure vessel equipment is a typical non-standard design, after three-dimensional parametric modeling, automatic layout needs to be carried out on the equipment, parts and other elements of an engineering drawing, and two-dimensional rendering is carried out according to an automatic layout result, so that a two-dimensional engineering drawing is obtained.
In the process of automatically drawing engineering drawings, a two-dimensional graph of equipment is formed by assembling a plurality of parts, and the assembling refers to the process of combining a plurality of parts into a product. In the two-dimensional drawing, the assembled graph is a combination of simple points and lines, and a computer cannot extract business knowledge from the combination, so that the common method in the industry at present is to label the points manually, the point lines are meaningful manually, but the manual labeling is very complicated, a large amount of manpower is consumed, and the condition that the labeling starting point is wrong often occurs.
Disclosure of Invention
In order to solve the problem that the starting point is difficult to determine in the drawing marking position in the prior art, the invention provides a marking method and a marking system which are suitable for automatic drawing of assembly modeling; when the three-dimensional part is drawn, the coordinate system is inserted into the position where the two parts are connected, and when the two-dimensional drawing is generated by the three-dimensional part, the annotation starting point on the drawing is the position corresponding to the origin of the coordinate system in the three-dimensional part.
In a first aspect, the invention provides a labeling method suitable for automatic drawing of assembly modeling;
a labeling method suitable for assembly modeling automatic plotting, comprising:
acquiring a three-dimensional model of a part; in the three-dimensional model of the part, establishing a global coordinate system and a local coordinate system according to the positioning relation between the current part and other parts; correspondingly, a global coordinate system and a local coordinate system which are in one-to-one correspondence with the three-dimensional model are established in the two-dimensional model of the part;
establishing a three-dimensional model after the parts are assembled according to the positioning relation between the current parts and other parts, and generating a three-dimensional file;
traversing the three-dimensional file to find the positioning relation among all parts; establishing a positioning tree according to the positioning relation among the parts;
traversing the three-dimensional file to find a two-dimensional model corresponding to each part; according to the positioning relation among all parts in the positioning tree, the two-dimensional models of all parts are laid out according to the coordinate systems of all parts, and a two-dimensional graph is generated;
traversing the two-dimensional graph, and recording a global coordinate system and a local coordinate system required by the two-dimensional model positioning of each part according to the positioning tree;
and determining whether the current part needs to be marked, if so, finding a local coordinate system corresponding to the two-dimensional model of the current part, and marking the non-zero size of the part by taking the original point of the local coordinate system as the starting point of marking.
In a second aspect, the invention provides a labeling system adapted to assemble a modeled automatic graph;
a labeling system adapted for assembly modeling automatic plotting, comprising:
an acquisition module configured to: acquiring a three-dimensional model of a part; in the three-dimensional model of the part, establishing a global coordinate system and a local coordinate system according to the positioning relation between the current part and other parts; correspondingly, a global coordinate system and a local coordinate system which are in one-to-one correspondence with the three-dimensional model are established in the two-dimensional model of the part;
a three-dimensional model building module configured to: establishing a three-dimensional model after the parts are assembled according to the positioning relation between the current parts and other parts, and generating a three-dimensional file;
a positioning tree establishment module configured to: traversing the three-dimensional file to find the positioning relation among all parts; establishing a positioning tree according to the positioning relation among the parts;
a two-dimensional map generation module configured to: traversing the three-dimensional file to find a two-dimensional model corresponding to each part; according to the positioning relation among all parts in the positioning tree, the two-dimensional models of all parts are laid out according to the coordinate systems of all parts, and a two-dimensional graph is generated;
a coordinate system recording module configured to: traversing the two-dimensional graph, and recording a global coordinate system and a local coordinate system required by the two-dimensional model positioning of each part according to the positioning tree;
an annotation module configured to: and determining whether the current part needs to be marked, if so, finding a local coordinate system corresponding to the two-dimensional model of the current part, and marking the non-zero size of the part by taking the origin of the local coordinate system as the starting point of marking.
Compared with the prior art, the invention has the beneficial effects that:
by using the method of the invention, the computer can find the starting point of the annotation without manual intervention. The method has the advantages that the marking starting point is positioned, the significance of actual service is facilitated, a software development engineer can write codes conveniently, and the working efficiency of the engineer is improved. The method can reduce manual intervention, automatically select the initial point of marking, improve the automatic drawing quality of the engineering drawing and reduce the acquisition cost of high-quality drawing.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flowchart of a method according to a first embodiment.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and furthermore, it should be understood that the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
All data are obtained according to the embodiment and are legally applied on the data on the basis of compliance with laws and regulations and user consent.
Example one
The embodiment provides a labeling method suitable for an automatic drawing of assembly modeling;
as shown in fig. 1, a labeling method suitable for assembly modeling automatic drawing includes:
s101: acquiring a three-dimensional model of a part; in the three-dimensional model of the part, establishing a global coordinate system and a local coordinate system according to the positioning relation between the current part and other parts; correspondingly, a global coordinate system and a local coordinate system which are in one-to-one correspondence with the three-dimensional model are established in the two-dimensional model of the part;
s102: establishing a three-dimensional model after the parts are assembled according to the positioning relation between the current parts and other parts, and generating a three-dimensional file;
s103: traversing the three-dimensional file to find the positioning relation among all parts; establishing a positioning tree according to the positioning relation among the parts;
s104: traversing the three-dimensional file to find a two-dimensional model corresponding to each part; according to the positioning relation among all parts in the positioning tree, the two-dimensional models of all parts are laid out according to the coordinate systems of all parts, and a two-dimensional graph is generated;
s105: traversing the two-dimensional graph, and recording a global coordinate system and a local coordinate system required by the two-dimensional model positioning of each part according to the positioning tree;
s106: and determining whether the current part needs to be marked, if so, finding a local coordinate system corresponding to the two-dimensional model of the current part, and marking the non-zero size of the part by taking the original point of the local coordinate system as the starting point of marking.
Further, the method further comprises: and (4) annotating the part, wherein the starting point of the annotation is the original point position of the local coordinate system, and the part number, the shape size or the position size of the part are marked through the local coordinate system.
Further, the other parts refer to parts which have an assembly relation with the current parts.
Further, the global coordinate system and the local coordinate system are both rectangular coordinate systems.
Further, in the three-dimensional model of the part, a global coordinate system and a local coordinate system are established according to the positioning relation between the current part and other parts; the method specifically comprises the following steps:
assuming that the current part is part A; the other parts are parts B;
if the part A and the part B have a positioning relation, establishing a first local coordinate system at one end of the part A having the positioning relation with the part B; meanwhile, a second local coordinate system is established at one end of the part B, which has a positioning relation with the part A;
establishing a global coordinate system for all parts; there is only one global coordinate system and a plurality of local coordinate systems.
Illustratively, assuming that a part a has a port a1 and a port a2, a part B has a port B1 and a port B2, and the port a2 of the part a and the port B1 of the part B have a positioning relationship, a local coordinate system c1 is established at the port a2 of the part a, and a local coordinate system c2 is established at the port B1 of the part B.
Further, S102: establishing a three-dimensional model after the parts are assembled according to the positioning relation between the current parts and other parts, and generating a three-dimensional file; wherein, the positioning relation includes: a connected relation and a non-connected relation; the connection relationship comprises: contact with each other, adhesion to each other, or welding to each other; the non-connection relationship comprises: relative position in space.
The description method of the positioning relation is as follows: the positioning relation of the two parts is described by four variables of a positioning type, a dependent part, a dependent coordinate system and a positioning parameter.
The positioning types comprise right-angle positioning, cylindrical positioning and spherical positioning; determining a marking type according to the positioning type; for example, in the case of right-angle positioning, the type of label is the distance between two points; the distance and eccentricity are required to be marked for positioning the cylinder; spherical positioning and marking angles and the like;
wherein, the dependent part refers to a part which is dependent when a certain part is positioned;
wherein, depending on the coordinate system, it refers to the coordinate system that a certain part depends on when positioning, for example, la coordinate system in part a is positioned according to Lb coordinate system in part B, then Lb is the dependent coordinate system of part a;
the positioning parameters refer to position parameters between two coordinate systems, and different types of positioning modes have different types of positioning parameters.
Further, S103: establishing a positioning tree according to the positioning relation among the parts; the method specifically comprises the following steps:
taking a part i at the origin of a global coordinate system in an assembly environment as a root node of a positioning tree;
all nodes except the part i in the three-dimensional model after the part is assembled are used as sub-nodes of the positioning tree;
determining whether connecting edges exist between the root node and the child nodes corresponding to the part and between the child nodes and other child nodes according to whether a positioning relation exists between the current part and other parts;
if the current part has a positioning relation with other parts, a connecting edge exists between the nodes corresponding to the part;
and if the positioning relation does not exist between the current part and other parts, the nodes corresponding to the parts do not have connected edges.
Further, the S104: according to the positioning relation among all parts in the positioning tree, the two-dimensional models of all parts are laid out according to the coordinate systems of all parts, and a two-dimensional graph is generated; the method specifically comprises the following steps:
s1041: firstly, laying out all parts directly depending on a global coordinate system;
s1042: secondly, the layout directly depends on the parts of the laid-out parts;
s1043: step S1042 is repeated until all parts are laid out.
Wherein, first, all parts directly depending on the global coordinate system are laid out; the dependency here means that the position of the part to be laid out is determined according to the position of the part to be laid out in the global coordinate system.
Wherein the secondary layout is directly dependent on the part for which the part has been laid out; the dependency here means that there is a positioning relationship between the parts to be laid out and the parts already laid out.
Further, the non-zero dimension of the part refers to a dimension with a dimension value different from zero, and the types include: length dimension, angle dimension, radius dimension.
The method for adding three coordinate systems in the three-dimensional part is used, and a basis is provided for marking the two-dimensional drawing. The problem of difficulty in automatic labeling of a computer is solved, a coordinate system is usually established at a contact position of two parts, and corresponding coordinate system information is also contained in a front view, a left view and a top view of the three-dimensional part. When a two-dimensional drawing is generated by a three-dimensional part, the origin of a coordinate system in a view is used as the starting point of the annotation, and the size, the shape, the positioning and the like can be marked in the drawing.
In the invention, the local coordinate system of the seed plays two roles, one is used for positioning, the local coordinate systems of the two parts are overlapped during assembly, and the two parts are assembled together, so that the relations of contact, adhesion, welding and the like of the two parts can be conveniently displayed in an automatically generated engineering drawing; and secondly, the mark starting point is artificially predefined, so that the display of the mark information in the drawing is facilitated.
Example two
The embodiment provides a labeling system suitable for automatic drawing of assembly modeling;
a labeling system adapted for assembly modeling automatic plotting, comprising:
an acquisition module configured to: acquiring a three-dimensional model of a part; in a three-dimensional model of a part, establishing a global coordinate system and a local coordinate system according to a positioning relation between a current part and other parts; correspondingly, a global coordinate system and a local coordinate system which are in one-to-one correspondence with the three-dimensional model are established in the two-dimensional model of the part;
a three-dimensional model building module configured to: establishing a three-dimensional model after the parts are assembled according to the positioning relation between the current parts and other parts, and generating a three-dimensional file;
a positioning tree establishment module configured to: traversing the three-dimensional file to find the positioning relation among all parts; establishing a positioning tree according to the positioning relation among the parts;
a two-dimensional map generation module configured to: traversing the three-dimensional file to find a two-dimensional model corresponding to each part; according to the positioning relation among all parts in the positioning tree, the two-dimensional models of all parts are laid out according to the coordinate systems of all parts, and a two-dimensional graph is generated;
a coordinate system recording module configured to: traversing the two-dimensional graph, and recording a global coordinate system and a local coordinate system required by the two-dimensional model positioning of each part according to the positioning tree;
an annotation module configured to: and determining whether the current part needs to be marked, if so, finding a local coordinate system corresponding to the two-dimensional model of the current part, and marking the non-zero size of the part by taking the original point of the local coordinate system as the starting point of marking.
It should be noted here that the acquiring module, the three-dimensional model building module, the positioning tree building module, the two-dimensional map generating module, the coordinate system recording module and the labeling module correspond to steps S101 to S106 in the first embodiment, and the modules are the same as the corresponding steps in the implementation example and application scenario, but are not limited to the disclosure in the first embodiment. It should be noted that the modules described above as part of a system may be implemented in a computer system such as a set of computer executable instructions.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A labeling method suitable for automatic drawing of assembly modeling is characterized by comprising the following steps:
acquiring a three-dimensional model of a part; in a three-dimensional model of a part, establishing a global coordinate system and a local coordinate system according to a positioning relation between a current part and other parts; correspondingly, a global coordinate system and a local coordinate system which are in one-to-one correspondence with the three-dimensional model are established in the two-dimensional model of the part;
establishing a three-dimensional model after the parts are assembled according to the positioning relation between the current parts and other parts, and generating a three-dimensional file;
traversing the three-dimensional file to find the positioning relation among all parts; establishing a positioning tree according to the positioning relation among the parts;
traversing the three-dimensional file to find a two-dimensional model corresponding to each part; according to the positioning relation among all parts in the positioning tree, the two-dimensional models of all parts are laid out according to the coordinate systems of all parts, and a two-dimensional graph is generated;
traversing the two-dimensional graph, and recording a global coordinate system and a local coordinate system required by the two-dimensional model positioning of each part according to the positioning tree;
and determining whether the current part needs to be marked, if so, finding a local coordinate system corresponding to the two-dimensional model of the current part, and marking the non-zero size of the part by taking the origin of the local coordinate system as the starting point of marking.
2. The labeling method for an automatic drawing for assembly modeling according to claim 1, wherein said method further comprises: and (4) performing annotation on the part, wherein the starting point of the annotation is the original point position of the local coordinate system, and the part number, the shape size or the position size of the part are marked through the local coordinate system.
3. The labeling method for the automatic drawing for assembly modeling according to claim 1, wherein the other parts are parts having an assembly relationship with the current part.
4. The labeling method for the assembly modeling automatic drawing as claimed in claim 1, wherein the global coordinate system and the local coordinate system are rectangular coordinate systems.
5. The labeling method suitable for the assembly modeling automatic drawing as claimed in claim 1, wherein a global coordinate system and a local coordinate system are established in the three-dimensional model of the part according to the positioning relationship between the current part and other parts; the method specifically comprises the following steps:
assuming that the current part is part A; the other parts are parts B;
if the part A and the part B have a positioning relation, establishing a first local coordinate system at one end of the part A having the positioning relation with the part B; meanwhile, a second local coordinate system is established at one end of the part B, which has a positioning relation with the part A;
establishing a global coordinate system for all parts; there is only one global coordinate system and a plurality of local coordinate systems.
6. The labeling method suitable for the assembly modeling automatic drawing as claimed in claim 1, wherein a three-dimensional model of the assembled part is established according to the positioning relationship between the current part and other parts, and a three-dimensional file is generated; wherein, the positioning relation includes: a connected relation and a non-connected relation; the connection relation comprises: contact with each other, adhere to each other or weld to each other; the non-connection relationship comprises: relative position in space.
7. The labeling method for the assembly modeling automatic drawing as claimed in claim 1, wherein the positioning relationship is described by: describing the positioning relation of the two parts by four variables of a positioning type, a dependent part, a dependent coordinate system and a positioning parameter;
the positioning types comprise right-angle positioning, cylindrical positioning and spherical positioning; determining a marking type according to the positioning type; the distance between two points is marked by right-angle positioning; positioning and marking distance and eccentricity of the cylinder; spherical positioning and marking angles;
the dependent part refers to a part which is depended on when a certain part is positioned;
wherein, the dependent coordinate system refers to a coordinate system which is depended on when a certain part is positioned;
the positioning parameters refer to position parameters between two coordinate systems, and different types of positioning modes have different types of positioning parameters.
8. The labeling method suitable for the automatic drawing of the assembly modeling according to claim 1, wherein a positioning tree is established according to the positioning relationship among the parts; the method specifically comprises the following steps:
taking a part i at the origin of a global coordinate system in an assembly environment as a root node of a positioning tree;
all nodes except the part i in the three-dimensional model after the part is assembled are used as sub-nodes of the positioning tree;
determining whether connecting edges exist between a root node and a child node corresponding to the part and between the child node and other child nodes according to whether a positioning relation exists between the current part and other parts;
if the current part has a positioning relation with other parts, a connecting edge exists between the nodes corresponding to the part;
and if the positioning relation does not exist between the current part and other parts, the nodes corresponding to the parts do not have connected edges.
9. The labeling method suitable for the assembly modeling automatic drawing as claimed in claim 1, wherein the two-dimensional model of each part is laid out according to the coordinate system of each part according to the positioning relation among the parts in the positioning tree to generate a two-dimensional drawing; the method specifically comprises the following steps:
step (1): firstly, laying out all parts directly depending on a global coordinate system;
step (2): secondly, the layout directly depends on the parts of the laid-out parts;
and (3): and (3) repeating the step (2) until all parts are laid out.
10. A labeling system suitable for assembly modeling automatic plotting is characterized by comprising:
an acquisition module configured to: acquiring a three-dimensional model of a part; in the three-dimensional model of the part, establishing a global coordinate system and a local coordinate system according to the positioning relation between the current part and other parts; correspondingly, a global coordinate system and a local coordinate system which are in one-to-one correspondence with the three-dimensional model are established in the two-dimensional model of the part;
a three-dimensional model building module configured to: establishing a three-dimensional model after the parts are assembled according to the positioning relation between the current parts and other parts, and generating a three-dimensional file;
a positioning tree establishment module configured to: traversing the three-dimensional file to find the positioning relation among all parts; establishing a positioning tree according to the positioning relation among the parts;
a two-dimensional map generation module configured to: traversing the three-dimensional file to find a two-dimensional model corresponding to each part; according to the positioning relation among all parts in the positioning tree, the two-dimensional models of all parts are laid out according to the coordinate systems of all parts, and a two-dimensional graph is generated;
a coordinate system recording module configured to: traversing the two-dimensional graph, and recording a global coordinate system and a local coordinate system required by the two-dimensional model positioning of each part according to the positioning tree;
an annotation module configured to: and determining whether the current part needs to be marked, if so, finding a local coordinate system corresponding to the two-dimensional model of the current part, and marking the non-zero size of the part by taking the origin of the local coordinate system as the starting point of marking.
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