CN114792036B - Method, equipment and medium for judging conversion from standard part to non-standard part - Google Patents
Method, equipment and medium for judging conversion from standard part to non-standard part Download PDFInfo
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Abstract
The invention discloses a judging method, equipment and medium for converting a specification piece into a non-specification piece, wherein the method comprises the following steps: obtaining a model to be judged; comparing the sizes of the models to be judged; when the size comparison result meets the standard, performing shape comparison on the model to be judged; when the shape comparison results are different, judging that the model to be judged is converted into a non-specification piece; and when the size comparison result does not meet the standard, judging that the model to be judged is converted into a non-specification piece. The invention can reduce the judging time as much as possible and improve the judging efficiency on the premise of ensuring the accuracy and the reliability of the judgment through size comparison and shape comparison.
Description
Technical Field
The invention belongs to the technical field of fixture design, and particularly relates to a judging method, equipment and medium for converting a specification piece into a non-specification piece.
Background
Welding is a processing technology and a connecting mode for enabling two workpieces with the same polarity or different polarity to generate interatomic bonding through heating, pressurizing or a combination of the two workpieces. On a welding assembly line, the workload actually used for welding operation only accounts for 30% -40%, and 60% -70% is used for assisting and clamping workpieces. Because clamping is done on the welding jig, the jig plays an important role in the overall welding process.
The purpose of using a welding jig is to secure the workpiece to meet the welding requirements. In reality, no matter a manual welding mode or a robot automatic welding mode is adopted, a welding clamp is adopted to fix a workpiece and then welding is carried out. Therefore, the design of the workpiece to be welded, the design of the welding fixture, the layout of the welding station, and the robot welding simulation are the complete process of the robot welding simulation. The welding robot is used for carrying out simulation test in the fixture design process, so that interference between the welding robot and the fixture in the welding process is avoided, and the reliability of the welding process is improved.
In order to improve the efficiency of clamp design, a designer defines a clamp model which is frequently used as a template, stores the template in a database for management, defines the size which is frequently required to be modified in the clamp model as a driving parameter, and can enable the clamp to meet the assembly relation under different clamping scenes only by changing the numerical value of the driving parameter. Thus, the parameterized design of the welding fixture is realized, the part with the driving parameter size in the fixture model is a specification part, and the driving parameter in the specification part is a series size (such as 20-30-40) or a range size (such as 20-40).
The meaning of the specification piece is defined in the fixture template, firstly, the parameterization design of the welding fixture is realized, and on the other hand, the engineering drawing template can be formulated for the specification piece, and the specification piece and the engineering drawing template are associated, so that the numerical value of the driving parameter size on the engineering drawing is automatically refreshed along with the actual size of the specification piece, and the time and the workload of a designer for designing the engineering drawing of the part are reduced. However, if the designer modifies the form in the jig model after parameterizing the jig so that the dimensions do not meet the series, range, or shape of the form, then the form becomes a non-form. Non-specification parts are not workable using engineering drawing templates for specification parts, requiring additional engineering drawings. If the specification piece is converted into a non-specification piece, the original engineering drawing template is used for processing and assembling, so that a production system is disordered, the generation progress is affected, and property loss is caused. Therefore, it is necessary to determine whether or not the standard is converted into a non-standard.
Disclosure of Invention
In order to overcome the technical defects, the invention provides a judging method for converting a specification piece into a non-specification piece in a fixture design, which can reduce judging time as much as possible and improve judging efficiency on the premise of ensuring the accuracy and reliability of judgment.
In order to solve the problems, the invention is realized according to the following technical scheme:
a method of determining conversion of a specification to a non-specification in a fixture design, the method comprising the steps of:
obtaining a model to be judged;
comparing the sizes of the models to be judged;
when the size comparison result meets the standard, performing shape comparison on the model to be judged;
when the shape comparison results are different, judging that the model to be judged is converted into a non-specification piece;
and when the size comparison result does not meet the standard, judging that the model to be judged is converted into a non-specification piece.
Further, the step of comparing the sizes of the models to be judged comprises the following steps:
acquiring an actual value of a driving parameter of a model to be judged and a standard value of a driving parameter of a specification piece;
and comparing the actual value with the standard value, and comparing the sizes of the models to be judged.
Further, when the size comparison result meets the standard, performing shape comparison on the model to be judged, including the steps of:
when the size comparison result meets the standard, carrying out quick comparison on the dissimilarity of the model to be judged;
and when the quick comparison result of the different identities is that the different identities are identical, comparing the identities of the models to be judged.
Further, when the shape comparison results are different, judging that the model to be judged is converted into a non-specification piece, including the following steps:
when the quick comparison result of the dissimilarity is that the dissimilarity exists, judging that the model to be judged is converted into a non-standard piece;
and when the comparison result of the identity is that the identity is different, judging that the model to be judged is converted into a non-specification piece.
Further, when the size comparison result meets the standard, the step of rapidly comparing the dissimilarity of the model to be judged comprises the following steps:
when the size comparison result meets the standard, a specification model is obtained, and the numerical value of the specification model is the same as the actual numerical value of the driving parameter of the model to be judged;
respectively acquiring the volume of the model to be judged, the topological element and the volume of the specification model;
and comparing the volume of the model to be judged, the topological elements with the volume of the model of the specification piece, and rapidly comparing the dissimilarity.
Further, the step of comparing the volume of the model to be judged, the topological element and the volume of the specification model with the topological element, and performing quick comparison of different identities comprises the steps of:
comparing the volumes of the model to be judged and the specification model;
when the volumes are equal, comparing the number of surfaces of the model to be judged and the specification model;
when the number of the faces is equal, comparing the number of vertexes of the model to be judged and the model of the specification piece;
when the number of the vertexes is equal, comparing the number of edges of the model to be judged and the specification model;
when the number of the edges is equal, comparing the combination condition of the surfaces of the model to be judged and the specification part model;
when the combination conditions of the types of the surfaces are the same, comparing the combination conditions of the edges of the model to be judged and the specification model;
when the types of edges are combined identically, an identity comparison is made.
Further, when the shape comparison results are different, the step of judging that the model to be judged is converted into a non-specification piece comprises the following steps:
when the volumes are unequal, judging that the model to be judged is converted into a non-specification piece;
when the number of the surfaces is not equal, judging that the model to be judged is converted into a non-specification piece;
when the number of the vertexes is unequal, judging that the model to be judged is converted into a non-specification piece;
when the number of the edges is unequal, judging that the model to be judged is converted into a non-specification piece;
when the combination conditions of the types of the surfaces are different, judging that the model to be judged is converted into a non-specification piece;
and when the types of the edges are different in combination, judging that the model to be judged is converted into a non-specification piece.
Further, when the quick comparison result of the dissimilarity is that the dissimilarity is the identity, the identity comparison is performed on the model to be judged, and the method comprises the following steps:
respectively establishing a coordinate system of a model to be judged and a coordinate system of a specification part model;
transforming and overlapping the two coordinate systems;
when the two coordinate systems coincide, carrying out Boolean difference between the model to be judged and the specification model;
when the difference value exists in the Boolean difference result, judging that the same result is different, and judging that the model to be judged is converted into a non-specification piece;
when the Boolean difference results have no difference, the identity result is judged to be the identity, and the model to be judged is not converted into a non-specification piece.
Further, the step of transforming and overlapping the two coordinate systems includes the steps of:
fixing a model coordinate system of the specification piece;
and carrying out translation and rotation transformation on the coordinate system of the model to be judged, and coinciding with the coordinate system of the model of the specification piece.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a judging method, which judges whether a specification piece is converted into a non-specification piece by carrying out size comparison and shape comparison on a model to be judged, so that the accuracy and reliability of judgment are improved, the judging time is shortened, and the judging efficiency is improved.
The invention also discloses a device, comprising:
a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to execute the instructions to implement the determination method as described above.
The invention also discloses a computer readable storage medium, which is a storage medium readable by a computer, and a computer program stored on the storage medium, wherein the computer program is executed to realize the judging method.
Drawings
The invention is described in further detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a flow chart of a judging method in the embodiment 1;
FIG. 2 is a diagram showing a comparison of dimensions of the judging method according to the embodiment 1;
FIG. 3 is a second schematic diagram showing a comparison of the dimensions of the judging method in example 1;
FIG. 4 is a schematic diagram of the Boolean difference of the judging method in example 1;
fig. 5 is a schematic structural view of the apparatus described in embodiment 2.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Example 1
As shown in fig. 1, the embodiment discloses a method for determining conversion from a standard part to a non-standard part in a fixture design, which includes the steps of:
s1, acquiring a model to be judged; traversing all parts through a three-dimensional CAD interface program, and if user-defined variables exist in a variable table of the parts, determining the part model as a model to be judged; and obtaining the model to be judged through a three-dimensional CAD interface program.
S2, comparing the sizes of the models to be judged; and obtaining the actual value of the driving parameter of the model to be judged and the standard value of the driving parameter of the specification piece, comparing the actual value with the standard value, and comparing the sizes of the model to be judged.
S3, when the size comparison result meets the standard, performing shape comparison on the model to be judged; shape contrast includes rapid contrast of differences versus identity.
And S4, when the shape comparison results are different, judging that the model to be judged is converted into a non-specification piece.
And S5, when the size comparison result does not meet the standard, judging that the model to be judged is converted into a non-specification piece.
Specifically, in step S2, the actual values of the driving parameters of the model to be determined are obtained through the three-dimensional CAD interface program, the standard values (serial values, range values) of the driving parameters of the same-name standard part are automatically retrieved from the fixture template library (database) according to the name of the model to be determined through the computer program, and the actual values are compared with the standard values.
Referring to fig. 2, obtaining an angle seat part model to be judged through three-dimensional CAD, obtaining an actual height value H0 of the angle seat part model to be judged and a serial value (H1-H2-H3) of an angle seat part specification part model, comparing H0 with H1, H2 and H3, and judging the angle seat part model to be judged as a specification part if h0=h1 or h0=h2 or h0=h3; if H0 is not equal to any one of the values of H1, H2 and H3, judging that the corner seat part model to be judged is converted into a non-standard part.
As shown in fig. 3, acquiring a support block part model to be judged through three-dimensional CAD, acquiring an actual height value A0 of the support block part model to be judged and range values (A1-A2) of a support block part specification part model, comparing A0 with (A1-A2), and judging the support block part model to be judged as a specification part if A1 is less than or equal to A0 and less than or equal to A2; if A0< A1 or A0> A2, judging that the support block part model to be judged is converted into a non-specification part.
Specifically, in step S3, the method includes the following steps:
s31, when the actual numerical value is the same as the serial numerical value or the actual numerical value falls within the range numerical value, carrying out quick comparison on the dissimilarity of the model to be judged;
s32, when the quick comparison result of the different identities is that the identity exists, comparing the identities of the models to be judged;
s33, when the quick comparison result of the different identities is that the different identities exist, judging that the model to be judged is converted into a non-specification piece;
and S34, when the comparison result of the identity is that the identity is different, judging that the model to be judged is converted into a non-specification piece.
In the above embodiment, step S31 includes the steps of:
s311, when the actual numerical value is the same as the serial numerical value or the actual numerical value falls within the range numerical value, acquiring a specification model with the same driving parameter numerical value as the model to be judged;
s312, respectively acquiring the volume of the model to be judged, the topological element and the volume of the specification model;
s313, comparing the volume of the model to be judged, the topological elements with the volume of the specification model, and rapidly comparing the different identities.
In the above embodiment, the rapid comparison of the differences includes the following steps:
calculating a model G to be judged j Volume V of (2) gj And specification part model G o Volume V of (2) go Comparison of V gj And V is equal to go ；
When V is gj And V go If the model to be judged and the standard part model are not equal, judging that the model to be judged is converted into a non-standard part;
when V is gj And V go When the model to be judged and the specification model are equal, the model to be judged and the specification model are considered to have the same property, and G is calculated j Number of faces N Fgj And G o Number of faces N Fgo Comparison of N Fgj And N Fgo ；
When N is Fgj And N Fgo If the model to be judged and the standard part model are not equal, judging that the model to be judged is converted into a non-standard part;
when N is Fgj And N Fgo When the model to be judged and the specification model are equal, the model to be judged and the specification model are considered to have the same property, and G is calculated j Number N of vertices of (2) Pgj And G o Number N of vertices of (2) Pgo Comparison of N Pgj And N Pgo ；
When N is Pgj And N Pgo If the model to be judged and the standard part model are not equal, judging that the model to be judged is converted into a non-standard part;
when N is Pgj And N Pgo When the model to be judged and the specification model are equal, the model to be judged and the specification model are considered to have the same property, and G is calculated j Number of edges N of (2) Egj And G o Number of edges N of (2) Ego Comparison of N Egj And N Ego ；
When N is Egj And N Ego If the model to be judged and the standard part model are not equal, judging that the model to be judged is converted into a non-standard part;
when N is Egj And N Ego When the model to be judged and the specification model are equal, the model to be judged and the specification model are considered to have the same property, and G is calculated j Type distribution of faces and G o Comparing the combination condition of the faces of the model to be judged and the specification model:
G j ：N Pgj -N Hgj ；
G o ：N Pgo -N Hgo (wherein N P Represents the number of planes, N H Representing the number of curved surfaces);
when the combination conditions of the types of the surfaces are different, the model to be judged and the specification piece model are considered to have no identity, and the model to be judged is judged to be converted into a non-specification piece;
when the combination conditions of the types of the surfaces are the same, comparing the combination conditions of the edges of the model to be judged and the specification model:
G j ：N Sgj -N Cgj ；
G o ：N Sgo -N Cgo (wherein N S Represents the number of straight edges, N C Representing the number of curved edges);
when the types of the edges are different in combination, the model to be judged and the standard part model are considered to have no identity, and the model to be judged is judged to be converted into a non-standard part;
when the types of the edges are identical in combination, the model to be judged and the specification model are considered to have the same property, and the model to be judged and the specification model are subjected to the same property comparison.
And according to the acquired name of the model to be judged and the actual numerical value of the driving parameter of the model to be judged, acquiring a corresponding specification part model, and rapidly judging the dissimilarity of the model to be judged and the specification part model according to the volume size of the part and the number of topological elements (points, edges, surfaces and the like).
Specifically, step S32 includes the steps of:
s321, obtaining a model G to be judged through three-dimensional CAD software j Centroid and principal axis of inertia of (d) specification model G o The mass center and the principal axes of inertia of the model G to be judged are respectively established by taking the mass center as the circle center O and the three principal axes of inertia of the center as x, y and z axes respectively j Coordinate system (Oxyz) j and specification model G o A coordinate system (Oxyz) o;
s322, transforming and overlapping the two coordinate systems;
s323, carrying out Boolean difference between the model to be judged and the specification model;
s324, when the difference value exists in the Boolean difference result, judging that the same result is different, and judging that the model to be judged is converted into a non-specification piece;
and S325, when the Boolean difference result does not have a difference value, judging that the same result is identical, and judging that the model to be judged is not converted into a non-specification piece.
Specifically, in step S322, the following steps are included:
fixed gauge part model G o (Oxyz) o;
to-be-judged model G j The x, y and z axes of the coordinate system (Oxyz) j are translated and rotated and then are transformed with G o The x, y and z axes of the coordinate system (Oxyz) o are respectively corresponding and overlapped, the transformation matrix is denoted as M, and the matrix M is used A Representing a model G to be judged j Using a matrix M B Representing a specification model G o The transformation from model a to model B takes the form:
M A ×M＝M B wherein
Wherein x is VAi Represents the x component, x, of the ith vector of model A VBi Representing the x component, y of the ith vector of model B VAi Representing the y component, y, of the ith vector of model A VBi Representing the y component, z, of the ith vector of model B VAi Representing the z-component, z, of the ith vector of model A VBi Representing the z-component of the ith vector of model B. X is x OA Is the x component, y of the centroid coordinates of model A OA Is the y component, z of the centroid coordinates of model A OA Is the z component, x of the centroid coordinates of model A OA Is the x component, y of the centroid coordinates of model A OA Is the y component, z of the centroid coordinates of model A OA Is the z-component of the centroid coordinates of model a.
As shown in fig. 4, boolean differencing is performed on the model to be judged and the specification model:
G＝|G o -G j |
g represents the result of boolean differencing between the model to be judged and the specification model, if g=0, it represents that the two models have identity, otherwise they do not.
The step S32 can accurately determine whether the two models have the same property, so as to determine whether the model to be determined is converted into a non-specification piece.
When the two models cannot be judged to have the dissimilarity by the quick judgment of the dissimilarity, obtaining the mass center and the central principal of inertia of the model to be judged, and the mass center and the central principal of inertia of the specification model through three-dimensional CAD software, and establishing a coordinate system; and carrying out rigid transformation such as translation and rotation on the model, and accurately judging the identity of the model by applying a Boolean difference method to the two models when the two coordinate systems are coincident.
Specifically, in step S5, when the actual numerical value is the same as the series numerical value or the actual numerical value falls within the range numerical value, it is determined that the model to be determined is converted into the non-standard part.
In this embodiment, the actual value of the driving parameter of the model to be determined is compared with the standard value of the standard part by size comparison, and if the actual value does not conform to the standard value (i.e. the actual value is not equal to the series value or the actual value is not within the range value), the standard part is determined to be converted into the non-standard part, for example, when the range value of the driving parameter of the standard part is taken as H: 20-30, judging that the model to be judged is converted into a non-specification piece when the actual value H0 of the driving parameter of the model to be judged takes the value 31; when the series of values of the driving parameters of the specification are a:10-20-30, and judging that the model to be judged is converted into a non-specification piece when the actual value A0 of the driving parameter of the model to be judged takes 15.
And when the size comparison cannot judge whether the model has different properties, performing shape comparison, and performing identity comparison on the model to be judged and the specification part model obtained from the standard clamp library.
For two models to be compared, in order to realize accurate and reliable identity judgment, firstly, simple volume comparison, quantity comparison of midpoints, sides, surfaces and the like of topological elements are executed, and for the model with obvious change of shape, the method can rapidly judge whether the specification piece is converted into a non-specification piece.
When the method can not judge whether the two models have different properties, carrying out operations such as translation, rotation and the like on the two models to align the two models, and then carrying out Boolean difference operation, if the operation result is zero, indicating that the two models have the same properties, otherwise, the two models have the different properties.
The judging method reduces the judging time as much as possible and improves the judging efficiency on the premise of ensuring the accuracy and the reliability of the judgment of the identity; the method comprises the steps of firstly rapidly judging the dissimilarity of the two models, then judging the identity of the two models by adopting a Boolean difference method, and on the premise of ensuring the accuracy and the reliability of the identity judgment, reducing the judging time as much as possible and improving the judging efficiency.
Example 2
As shown in fig. 5, the present embodiment discloses an apparatus including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute instructions to implement the determination method described in embodiment 1.
Example 3
The present embodiment discloses a computer-readable storage medium, which is a computer-readable storage medium having stored thereon a computer program that when executed implements the judgment method in embodiment 1.
Alternatively, the computer-readable storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), solid state disk (SSD, solid State Drives), or optical disk, etc. The random access memory may include resistive random access memory (ReRAM, resistance RandomAccess Memory) and dynamic random access memory (DRAM, dynamic Random Access Memory), among others.
The present invention is not limited to the preferred embodiments, and any modifications, equivalent variations and modifications made to the above embodiments according to the technical principles of the present invention are within the scope of the technical proposal of the present invention.
Claims (8)
1. A method for determining whether a standard part is converted into a non-standard part, the method comprising the steps of:
obtaining a model to be judged;
comparing the sizes of the models to be judged;
when the size comparison result meets the standard, performing shape comparison on the model to be judged;
when the shape comparison results are different, judging that the model to be judged is converted into a non-specification piece;
when the size comparison result does not meet the standard, judging that the model to be judged is converted into a non-specification piece;
when the size comparison result meets the standard, performing shape comparison on the model to be judged, and comprising the following steps:
when the size comparison result meets the standard, carrying out quick comparison on the dissimilarity of the model to be judged;
when the quick comparison result of the different identities is that the different identities are identical, comparing the identities of the models to be judged;
when the size comparison result meets the standard, carrying out quick comparison on the dissimilarity of the model to be judged, wherein the method comprises the following steps:
when the size comparison result meets the standard, a specification model is obtained, and the numerical value of the specification model is the same as the actual numerical value of the driving parameter of the model to be judged;
respectively acquiring the volume of the model to be judged, the topological element and the volume of the specification model;
and comparing the volume of the model to be judged, the topological elements with the volume of the model of the specification piece, and rapidly comparing the dissimilarity.
2. The judging method according to claim 1, wherein the step of comparing the sizes of the models to be judged comprises the steps of:
acquiring an actual value of a driving parameter of a model to be judged and a standard value of a driving parameter of a specification piece;
and comparing the actual value with the standard value, and comparing the sizes of the models to be judged.
3. The judging method according to claim 1, wherein the step of judging that the model to be judged is converted into the non-specification member when the shape comparison results are different, comprises the steps of:
when the quick comparison result of the dissimilarity is that the dissimilarity exists, judging that the model to be judged is converted into a non-standard piece;
and when the comparison result of the identity is that the identity is different, judging that the model to be judged is converted into a non-specification piece.
4. The judging method according to claim 1, wherein the step of comparing the volume of the model to be judged, the topological element, and the volume of the specification model with the topological element, and performing the quick comparison of the differences, comprises the steps of:
comparing the volumes of the model to be judged and the specification model;
when the volumes are equal, comparing the number of surfaces of the model to be judged and the specification model;
when the number of the faces is equal, comparing the number of vertexes of the model to be judged and the model of the specification piece;
when the number of the vertexes is equal, comparing the number of edges of the model to be judged and the specification model;
when the number of the edges is equal, comparing the combination condition of the surfaces of the model to be judged and the specification part model;
when the combination conditions of the types of the surfaces are the same, comparing the combination conditions of the edges of the model to be judged and the specification model;
when the types of edges are combined identically, an identity comparison is made.
5. The judging method according to claim 4, wherein the step of judging that the model to be judged is converted into the non-specification member when the shape comparison results are not the same, comprises the steps of:
when the volumes are unequal, judging that the model to be judged is converted into a non-specification piece;
when the number of the surfaces is not equal, judging that the model to be judged is converted into a non-specification piece;
when the number of the vertexes is unequal, judging that the model to be judged is converted into a non-specification piece;
when the number of the edges is unequal, judging that the model to be judged is converted into a non-specification piece;
when the combination conditions of the types of the surfaces are different, judging that the model to be judged is converted into a non-specification piece;
and when the types of the edges are different in combination, judging that the model to be judged is converted into a non-specification piece.
6. The judging method according to claim 1, wherein the step of comparing the identity of the model to be judged when the quick comparison result of the different identities is that the same, comprises the steps of:
respectively establishing a coordinate system of a model to be judged and a coordinate system of a specification part model;
transforming and overlapping the two coordinate systems;
when the two coordinate systems coincide, carrying out Boolean difference between the model to be judged and the specification model;
when the difference value exists in the Boolean difference result, judging that the same result is different, and judging that the model to be judged is converted into a non-specification piece;
when the Boolean difference results have no difference, the identity result is judged to be the identity, and the model to be judged is not converted into a non-specification piece.
7. An electronic device, comprising:
a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to execute the instructions to implement the judgment method of any one of claims 1-6.
8. A computer readable storage medium, characterized in that it is a computer readable storage medium, on which a computer program is stored, which computer program, when executed, implements the judging method according to any one of claims 1-6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210628279.2A CN114792036B (en) | 2022-06-02 | 2022-06-02 | Method, equipment and medium for judging conversion from standard part to non-standard part |
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| CN111998774A (en) * | 2020-08-12 | 2020-11-27 | 中车青岛四方机车车辆股份有限公司 | Rapid detection method for shape and position size of part |
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| CN111998774A (en) * | 2020-08-12 | 2020-11-27 | 中车青岛四方机车车辆股份有限公司 | Rapid detection method for shape and position size of part |
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