CN107330179B - Method for quickly creating three-dimensional process model with process auxiliary characteristics - Google Patents
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Abstract
The invention discloses a method for quickly creating a three-dimensional process model containing process auxiliary features, which judges whether the process auxiliary features are added in each process or not by analyzing the processing process of parts, and firstly, matching the auxiliary features in a process auxiliary feature library based on a proposed process auxiliary feature matching algorithm if the process auxiliary features are needed; then, adding the process auxiliary features according to the adding conditions and the adding method of the process auxiliary features; and finally, adding process information to complete the creation of the inter-process model containing the process auxiliary characteristics. And if the process auxiliary features are not needed in the process, adding the process removal features and then completing the establishment of the three-dimensional process model. The invention reduces the difficulty of designing the process of the part with the process auxiliary characteristic, improves the establishing efficiency of the three-dimensional process model and reduces the time of process preparation.
Description
Technical Field
The invention belongs to the field of three-dimensional process model creation of thin-wall parts, and relates to a method for quickly creating a three-dimensional process model with process auxiliary characteristics.
Background
At present, in the field of three-dimensional process design, most parts are manufactured by a material removing method, but some parts which are difficult to clamp and position need to be artificially added with some process boss features or process lugs and other features. Some process auxiliary features do not influence the subsequent processing of the part and are remained on the part, but some process auxiliary features are only used for clamping or positioning in the process, and the next process needs to be processed and removed. The function of the process auxiliary feature can not only reduce the processing area of the part, but also ensure good contact of the matching surface, thereby better processing, positioning and clamping, so the process auxiliary feature is important in solving the production problem of complex parts. The existing process model modeling method is realized by using methods such as geometric reasoning, body decomposition and the like, but is limited to existing machining characteristics on a part model, and the existing thin-wall parts containing process auxiliary characteristics cannot be quickly created. If the step of establishing the three-dimensional process model containing the process auxiliary features based on the commercial CAD software is carried out, the method comprises the following steps: firstly, drawing a sketch based on a sketch function; then, realizing the modeling of the sketch by utilizing a stretching or removing function; and finally, the creation of the model between the three-dimensional processes is realized based on the created process auxiliary characteristics, so that the process is time-consuming and labor-consuming, cannot meet the requirement of rapid modeling, and is not suitable for design change in the later period.
There are two types of fast modeling methods: the method comprises the following steps of sequential modeling and reverse-sequential modeling, wherein the sequential modeling has large workload, the work is repeated, the process of generating the model is consistent with the actual machining process, and the method has great advantages in the machining aspect of multi-structural parts; and filling the features on the part on the basis of deep analysis of the features during reverse modeling, and returning to the initial blank model state all the time, wherein the definition process of the part model is required to meet the standard requirements, otherwise, the features to be processed cannot be automatically identified. The traditional reverse modeling has large application limitation, and for reverse modeling of thin-wall parts, as the characteristics such as process auxiliary characteristics are absent on the parts and need to be independently added on an inter-process model by a designer, the characteristics such as the process auxiliary characteristics are absent on the inter-process model and cannot be achieved by the traditional reverse modeling. The patent 'three-dimensional machining order model sequential modeling method based on removal feature identification' (patent application number: 201210578397.3) describes a three-dimensional machining order model modeling method based on sequential removal feature identification, which selects the features to be removed in each process, but can not meet the modeling requirements for parts needing to add auxiliary boss features and lugs in the machining process. The patent "a method for constructing a dynamic three-dimensional process model" (patent application No. 201210178749.6) describes a method for establishing a dynamic three-dimensional process model based on Pro/E secondary development, all operations need to be based on Pro/E secondary development as background, so that the expansion application of the dynamic three-dimensional process model is limited, and no solution is made for adding features.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problem that the existing inter-process model modeling method cannot rapidly add process auxiliary features, the invention provides a rapid three-dimensional process model creation method containing process auxiliary features for products of thin-wall parts containing process auxiliary features.
The technical scheme is as follows: the invention provides a method for quickly creating a three-dimensional process model with process auxiliary characteristics, which adopts reverse-order modeling and creates the three-dimensional process model by reversely pushing a design model to a blank model, and comprises the following steps:
step 1: analyzing the specific processing process of the part design model according to the process requirements;
step 2: judging whether a process auxiliary feature is added or not according to the specific processing process of each procedure, and if the process auxiliary feature is added, turning to the step 3; otherwise, turning to the step 6, adding a working procedure to remove the body characteristics;
and step 3: intelligently matching process auxiliary features in a process auxiliary feature library according to the types of the parts;
and 4, step 4: setting a driving parameter of process auxiliary feature modeling, determining the shape and size of process auxiliary information, and creating a process auxiliary feature;
and 5: completing the addition of the process auxiliary features according to the process auxiliary feature addition criterion and the process auxiliary feature addition method, and turning to the step 7;
step 6: selecting a processing surface of the inter-process model, identifying the characteristics of a removed body, generating a removed characteristic body, and performing Boolean operation with the inter-process model to complete the addition of the removed body;
and 7: and adding process information with corresponding characteristics to complete the creation of the process model.
The process auxiliary characteristics comprise two types of process bosses and process lugs, wherein the types of the process bosses comprise square process bosses and cylindrical process bosses, and the types of the process lugs comprise square process lugs and trapezoidal process lugs; the process auxiliary features are divided into auxiliary machining features, auxiliary clamping features, auxiliary measuring features and auxiliary assembling features according to application occasions.
And 3, judging the type of the part and the application occasion to realize intelligent matching of the process auxiliary characteristics, wherein the matching algorithm comprises the following steps:
step 3.1: judging the type of the part;
step 3.2: judging the type of the process auxiliary features;
step 3.3: matching process auxiliary features based on a process knowledge base;
step 3.4: and outputting the matched process auxiliary characteristics.
The specific method for creating the process auxiliary features in the step 4 comprises the following steps:
step 4.1: analyzing the currently matched process auxiliary characteristics;
step 4.2: determining characteristic parameters according to a driving parameter table of the process auxiliary characteristics;
step 4.3: creating a parameter expression according to the parametric size;
step 4.4: creating a parameterized graph template;
step 4.5: creating a parameterized program framework;
step 4.6: writing a parameterized program;
step 4.7: compiling the link to generate a dynamic link library file;
step 4.8: and (5) running the debugging program, completing the parameterized feature modeling if the requirements are met, and returning to the step 4.6 if the requirements are not met.
The process assist feature addition criteria of step 5 are as follows:
(1) position addition criteria: the machining of other characteristics by the cutter cannot be influenced, and the process auxiliary characteristics are added on the rough reference surface of the part;
(2) number addition criteria: if the process auxiliary features are used for auxiliary positioning, the number of the positioning process auxiliary features is even; if the process auxiliary features are used for auxiliary clamping, the clamping process auxiliary features are even, and the added process auxiliary features are uniformly distributed, so that the parts are completely positioned and clamped.
Step 5 is directed to a method for adding process auxiliary features on a model, and the method comprises the following steps:
step 5.1: determining the addition surface: acquiring a contact surface of the process auxiliary feature and the inter-process model, and acquiring a surface added by the inter-process model, and combining the two surfaces;
step 5.2: determining the position: and adjusting the position parameters of the process auxiliary features on the surface of the model between the working procedures to determine the positions of the process auxiliary features.
Step 5.3: boolean operation: performing Boolean sum operation on the process auxiliary characteristics and the inter-process model;
step 5.4: adding process information: and adding the process information of the process auxiliary features, and finally finishing the addition of the process auxiliary features.
Has the advantages that: the invention provides a method for quickly creating a three-dimensional process model for machining parts with process auxiliary features, which solves the problem that the existing modeling technology cannot quickly model the parts with the process auxiliary features, and simplifies the process design difficulty of the parts with the process auxiliary features; and a novel generation method for adding process auxiliary features to the model among the processes is also provided, the logic and habit of actual machining operation are met, the requirement for quickly creating the process model is met, and the time for process preparation is shortened.
Drawings
FIG. 1 is a general flow diagram of the additive process aiding model of the present invention;
FIG. 2 is a process assist feature classification diagram of the present invention;
FIG. 3 is a process assist feature matching flow diagram;
FIG. 4 is a flow chart of parameterized feature modeling
FIG. 5 is a flow chart of a process assist feature addition method
FIG. 6 is a schematic diagram of an exemplary part modeling process of the present invention;
FIG. 7 is a schematic view of a process assist feature addition process of the present invention;
FIG. 8 is a table of drive parameters for process assist features.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1, a method for rapidly creating a three-dimensional process model with process auxiliary features, which uses reverse modeling and is created by reversely pushing a design model to a blank model, comprises the following steps:
step 1: analyzing the specific processing process of the part design model according to the process requirements;
step 2: judging whether a process auxiliary feature is added or not according to the specific processing process of each procedure, and if the process auxiliary feature is added, turning to the step 3; otherwise, turning to the step 6, adding a working procedure to remove the body characteristics;
and step 3: intelligently matching process auxiliary features in a process auxiliary feature library according to the types of the parts;
and 4, step 4: setting a driving parameter of process auxiliary feature modeling, determining the shape and size of process auxiliary information, and creating a process auxiliary feature;
and 5: completing the addition of the process auxiliary features according to the process auxiliary feature addition criterion and the process auxiliary feature addition method, and turning to the step 7;
step 6: selecting a processing surface of the inter-process model, identifying the characteristics of a removed body, generating a removed characteristic body, and performing Boolean operation with the inter-process model to complete the addition of the removed body;
and 7: and adding process information with corresponding characteristics to complete the creation of the process model.
In order to facilitate the rapid process model modeling operation containing process auxiliary characteristics, the invention divides the characteristics of parts into two types: manufacturing features that are essential to the function of the part, and process assist features that are added for the purpose of machining the part. According to the application of the process auxiliary characteristics, the method is divided into the following steps: the auxiliary machining feature, the auxiliary clamping feature, the auxiliary measuring feature and the auxiliary assembling feature. Auxiliary processing characteristics: the auxiliary machining features are divided into two types, one type is a process auxiliary feature which is arranged for reducing the machining area, a process boss is often manufactured on the contact surface of a part, the machining surface is reduced, the machining period is shortened, and the machining precision is ensured; one is a process assist feature that reduces the difficulty of machining. Auxiliary clamping characteristics: the auxiliary clamping features are divided into two types, one type is a process auxiliary feature which is arranged for facilitating part clamping, the other type is used as a rough reference, and some parts cannot be positioned on a plane during clamping, so that a mode of adding a process boss is used as the rough reference of the parts. Auxiliary measurement characteristics: some parts are difficult to measure easily during measurement, so a process auxiliary feature is added, the precision of the process auxiliary feature is high, and the problem that an operator is difficult to measure is well solved. Auxiliary assembly characteristics: when some parts are assembled, the assembling requirements cannot be met due to the fact that the assembling and positioning are not carried out, process auxiliary features are added to the parts, the assembling and positioning can be facilitated, and the assembling requirements are met.
In step 3, the process assist features are matched in the process assist feature library, as shown in fig. 3, the specific matching algorithm comprises the following steps:
step 3.1: judging the type of the part;
step 3.2: judging the type of the process auxiliary features;
step 3.3: matching process auxiliary features based on a process knowledge base;
step 3.4: and outputting the matched process auxiliary characteristics.
Step 4, parametric feature modeling, namely determining parameter types through a driving parameter table of the process auxiliary features, then performing parametric feature modeling, and creating the process auxiliary features, wherein the process is shown as a figure 4, and the specific steps are as follows:
step 4.1: analyzing the currently matched process auxiliary characteristics;
step 4.2: determining characteristic parameters according to a driving parameter table of the process auxiliary characteristics;
step 4.3: creating a parameter expression according to the parametric size;
step 4.4: creating a parameterized graph template;
step 4.5: creating a parameterized program framework;
step 4.6: writing a parameterized program;
step 4.7: compiling the link to generate a dynamic link library file;
step 4.8: and (5) running the debugging program, completing the parameterized feature modeling if the requirements are met, and returning to the step 4.6 if the requirements are not met.
In the embodiment, three-dimensional parameterized three-dimensional modeling is adopted, a craft worker uses a parameter expression to carry out three-dimensional modeling by determining driving parameters, a parameterized graph template uses a UG expression to carry out three-dimensional modeling, the constraint value of the corresponding three-dimensional model can be correspondingly changed by changing the value of the expression, and UG secondary development can be used for creating a program frame and writing a program when the parameter values are driven. And accessing the process assistant feature library by adopting a user interaction program.
The process assist feature addition criteria of step 5 are as follows:
(1) position addition criteria: the machining of other characteristics by the cutter cannot be influenced, and the process auxiliary characteristics are added on the rough reference surface of the part;
(2) number addition criteria: if the process auxiliary features are used for auxiliary positioning, the number of the positioning process auxiliary features is even; if the process auxiliary features are used for auxiliary clamping, the clamping process auxiliary features are even, and the added process auxiliary features are uniformly distributed, so that the parts are completely positioned and clamped.
Step 5 is directed to a method for adding process auxiliary features on a model, as shown in fig. 5, and includes the following steps:
step 5.1: determining the addition surface: acquiring a contact surface of the process auxiliary feature and the inter-process model, and acquiring a surface added by the inter-process model, and combining the two surfaces;
step 5.2: determining the position: and adjusting the position parameters of the process auxiliary features on the surface of the model between the working procedures to determine the positions of the process auxiliary features.
Step 5.3: boolean operation: performing Boolean sum operation on the process auxiliary characteristics and the inter-process model;
step 5.4: adding process information: and adding the process information of the process auxiliary features, and finally finishing the addition of the process auxiliary features.
Example combining the thin-wall part shown in fig. 6 and 7According to the scheme of the invention, firstly, the process auxiliary characteristics are matched in a process auxiliary characteristic library, a matching algorithm is shown in figure 3, then, the process auxiliary characteristics are created in a parameterization mode, the parameterization modeling process is shown in figure 4, as shown in figure 8, the driving parameters of the square process auxiliary characteristics comprise length l, width w, height h and inclination angle α, and the driving parameters of the cylindrical process boss comprise diameter
Height h and angle of inclination α, and the drive parameters of the square process lug include length l, width w, height h, fillet radius R and ear hole diameter
The drive parameters of the trapezoidal technical lug include length l, width w, angle α, radius of rounding R and ear eye diameter
Managing the driving parameters based on a process auxiliary feature library; and meeting the process assistant feature adding criterion, and finally adding the process assistant features according to a process assistant feature adding method, wherein the process assistant feature adding method is shown in fig. 5, and finally completing the creation of the inter-process model 4.
And then adding a threaded hole characteristic to finish an inter-process model 3, according to the scheme of the invention, adding the threaded hole characteristic to firstly obtain a removed characteristic body, firstly obtaining the processing surface of the removed characteristic body, identifying the removed characteristic body, then creating the removed characteristic body, finishing Boolean operation of the removed characteristic body and the model, finishing creating the inter-process model 3, secondly adding a milling plane characteristic 1 by using the same method for adding the removed characteristic body to finish an inter-process model 2, then adding a milling plane characteristic 2 to finish an inter-process model 1, and finally adding the hole characteristic to finish blank characteristics, wherein the specific flow is shown in figure 1.
Referring to FIG. 4, when the thin-wall part needs to be added with process auxiliary featuresFirstly, the process auxiliary feature matched with the thin-wall part is matched in a process auxiliary feature library to be a trapezoidal process lug, and then the parameters of length l, width w, angle α, radius R of the fillet and the diameter of the ear eye of the trapezoidal process lug are driven
Completing parametric modeling; secondly, according to the adding rule of the process auxiliary features, the process lugs are added on the thick datum plane of the thin-wall part, and the adding quantity is even; when a process lug is added, according to a process auxiliary feature adding method, the surface of a part is selected, a rough reference surface of an inter-process model is highlighted, meanwhile, a contact surface of the process auxiliary feature and the inter-process model is selected, the two surfaces are combined, position parameters of the process auxiliary feature on the surface of the inter-process model are adjusted, and the position of the process auxiliary feature is determined; finally, performing Boolean sum operation on the process auxiliary characteristics and the inter-process model; and adding the process information of the process auxiliary features, and finally finishing the addition of the process auxiliary features.
Claims (6)
1. A method for quickly creating a three-dimensional process model with process auxiliary characteristics is characterized in that reverse modeling is adopted, and a design model is reversely pushed to a blank model to create the three-dimensional process model, and comprises the following steps:
step 1: analyzing the specific processing process of the part design model according to the process requirements;
step 2: judging whether a process auxiliary feature is added or not according to the specific processing process of each procedure, and if the process auxiliary feature is added, turning to the step 3; otherwise, turning to the step 6, adding a working procedure to remove the body characteristics;
and step 3: intelligently matching process auxiliary features in a process auxiliary feature library according to the types of the parts;
and 4, step 4: setting a driving parameter of process auxiliary feature modeling, determining the shape and size of process auxiliary information, and creating a process auxiliary feature;
and 5: completing the addition of the process auxiliary features according to the process auxiliary feature addition criterion and the process auxiliary feature addition method, and turning to the step 7;
step 6: selecting a processing surface of the inter-process model, identifying the characteristics of a removed body, generating a removed characteristic body, and performing Boolean operation with the inter-process model to complete the addition of the removed body;
and 7: and adding process information with corresponding characteristics to complete the creation of the process model.
2. The method for rapidly creating the three-dimensional process model with the process auxiliary features according to claim 1, wherein the process auxiliary features comprise two types of process bosses and process lugs, wherein the process bosses comprise square process bosses and cylindrical process bosses, and the process lugs comprise square process lugs and trapezoidal process lugs; the process auxiliary features are divided into auxiliary machining features, auxiliary clamping features, auxiliary measuring features and auxiliary assembling features according to application occasions.
3. The method for rapidly creating the three-dimensional process model with the process auxiliary characteristics according to claim 1, wherein the intelligent matching of the process auxiliary characteristics is realized in the step 3 through the judgment of the type of the part and the application occasion, and the matching algorithm comprises the following steps:
step 3.1: judging the type of the part;
step 3.2: judging the type of the process auxiliary features;
step 3.3: matching process auxiliary features based on a process knowledge base;
step 3.4: and outputting the matched process auxiliary characteristics.
4. The method for rapidly creating the three-dimensional process model with the process auxiliary features according to claim 1, wherein the specific method for creating the process auxiliary features in the step 4 is as follows:
step 4.1: analyzing the currently matched process auxiliary characteristics;
step 4.2: determining characteristic parameters according to a driving parameter table of the process auxiliary characteristics;
step 4.3: creating a parameter expression according to the parametric size;
step 4.4: creating a parameterized graph template;
step 4.5: creating a parameterized program framework;
step 4.6: writing a parameterized program;
step 4.7: compiling the link to generate a dynamic link library file;
step 4.8: and (5) running the debugging program, completing the parameterized feature modeling if the requirements are met, and returning to the step 4.6 if the requirements are not met.
5. The method for rapidly creating the three-dimensional process model with the process auxiliary features according to claim 1, wherein the adding criteria of the process auxiliary features in the step 5 are as follows:
(1) position addition criteria: the machining of other characteristics by the cutter cannot be influenced, and the process auxiliary characteristics are added on the rough reference surface of the part;
(2) number addition criteria: if the process auxiliary features are used for auxiliary positioning, the number of the positioning process auxiliary features is even; if the process auxiliary features are used for auxiliary clamping, the clamping process auxiliary features are even, and the added process auxiliary features are uniformly distributed, so that the parts are completely positioned and clamped.
6. The method for rapidly creating the three-dimensional process model with the process auxiliary features according to claim 1, wherein the step 5 is directed to a method for adding the process auxiliary features on the model, and comprises the following steps:
step 5.1: determining the addition surface: acquiring a contact surface of the process auxiliary feature and the inter-process model, and acquiring a surface added by the inter-process model, and combining the two surfaces;
step 5.2: determining the position: and adjusting the position parameters of the process auxiliary features on the surface of the model between the working procedures to determine the positions of the process auxiliary features.
Step 5.3: boolean operation: performing Boolean sum operation on the process auxiliary characteristics and the inter-process model;
step 5.4: adding process information: and adding the process information of the process auxiliary features, and finally finishing the addition of the process auxiliary features.
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