CN110110378B - Method for rapidly detecting sticking property of complex curved surface - Google Patents
Method for rapidly detecting sticking property of complex curved surface Download PDFInfo
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- CN110110378B CN110110378B CN201910283948.5A CN201910283948A CN110110378B CN 110110378 B CN110110378 B CN 110110378B CN 201910283948 A CN201910283948 A CN 201910283948A CN 110110378 B CN110110378 B CN 110110378B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The invention discloses a method for rapidly detecting the mold sticking performance of a complex curved surface, which comprises the steps of firstly drawing a mold model in three-dimensional drawing software, and secondly introducing an entity model into finite element analysis software to perform punch forming simulation on a part to obtain an FLD (flash laser) image; and performing post-processing on the solved result file, and cutting the molded part at intervals of 45 degrees along the counterclockwise direction to obtain 4 important cutting surfaces. And finally, quantifying according to the distance between two points which are opposite to each other according to the one-to-one mapping relation between the point on the cutting line and the point on the convex die, and obtaining the die attaching data of the plate through finite element simulation software to simulate the die attaching state under the real condition. The forming effect of the workpiece is described more quickly and accurately, so that the level and the quality of the workpiece are improved.
Description
Technical Field
The invention relates to the field of sheet stamping precision, in particular to a method for rapidly detecting the die attaching performance of a complex curved surface.
Background
The automobile manufacturing industry has occupied a very high proportion of industries in the whole country with the improvement of the national standard of living since the new century. Most panels in automobiles are stamped from sheet metal. There are therefore high demands on the precision and quality of the stamping.
Because the traditional mould design mostly depends on empirical formula, the fault tolerance is lower on the novel molded surface. With the development of computer aided design technology based on CAE technology, the numerical simulation is developed vigorously, a great amount of the design is applied to the design trial of the die, and the reliability is improved to 95%.
The ability of a blank to take the shape of a die while drawing a part having a complex curved surface is referred to as conformability. The traditional sticking model property inspection depends on an experienced mould engineer and is time-consuming and labor-consuming, and the obtained data is often large in error. Based on the finite element numerical simulation technology, the die attaching condition can be rapidly observed through the post-processing module, and the die attaching performance can be accurately and specifically measured. Provides a new idea and method for improving the process precision.
Disclosure of Invention
The invention aims to solve the problems that a part with a complex curved surface is long in detection time and inaccurate in detection of the sticking property, and provides a method for rapidly detecting the sticking property of the complex curved surface.
The technical scheme adopted by the invention for solving the technical problem is as follows: a method for rapidly detecting the sticking property of a complex curved surface is realized by the following steps:
the method comprises the following steps: establishing a three-dimensional solid model according to the geometric dimension of the mold to be designed, and importing the model into finite element software for molding simulation to obtain an FLD image;
step two: carrying out post-processing analysis on the simulated file, carrying out anticlockwise sectioning on the complex curved surface which is difficult to form, and sectioning at an interval of 45 degrees for 4 times to obtain a sectioning line;
step three: marking a plurality of points on the section line plate material at equal distances, and recording the distances;
step four: marking a plurality of points on the section line male die at equal distances, and recording the distances;
step five: and (3) mapping a target point on the section line on the convex die by combining a finite element discretization idea to obtain an ideal point, representing the die attaching performance by using the distance between the target point and the ideal point, and quantifying the concrete degree of the curved surface die attaching through a relational expression, wherein the closer the die attaching performance is to 100%, the better the die attaching performance is, and the worse the die attaching performance is otherwise.
The method as claimed in claim 1, wherein the three-dimensional solid model of step one is in the. Iges format.
The method for rapidly detecting the mold sticking property of the complex curved surface according to claim 1, wherein the cutting position in the second step is a part of the complex curved surface, which has a high bulge and is difficult to stick a mold.
The method for rapidly detecting the sticking property of the complex curved surface according to claim 1, wherein the cutting angle in the step two is counterclockwise 0 °, 45 °, 90 ° and 135 °.
The method for rapidly detecting the sticking property of the complex curved surface according to claim 1, wherein the quantization is performed through a relational expression in the fifth step, and the specific relational expression is as follows:
wherein eta represents the sticking property, and the actual distance between the target point and the ideal point is defined as A i And the projection distance from the node on the male die to the starting position of the plate is defined as B i And n is the number of nodes.
The invention has the beneficial effects that: the invention relates to a method for rapidly detecting the sticking performance of a complex curved surface, which uses a post-processing module of finite element software to rapidly and accurately obtain a plurality of section lines of any section of a part, and then obtains a specific numerical value of the sticking performance by combining the relation between the sticking performance and each node according to the distance from the node on the section line to the corresponding node on a convex die. The method greatly improves the accuracy of the die attaching performance evaluation, and provides another reference way for optimizing the process parameters.
Drawings
FIG. 1 is an iges format fender model;
FIG. 2 is a 0 cut;
FIG. 3 is a 45 ° cut;
FIG. 4 is a 90 ° cut;
fig. 5 is a 135 ° cut.
Detailed Description
The embodiment is a rapid detection method for the mold sticking property based on a complex curved surface. The method adopts a case model as an automobile fender, and the specific detection steps are realized by the following steps:
the method comprises the following steps: establishing a three-dimensional solid model according to the geometric dimension of the mold to be designed, and importing the model into finite element software for molding simulation to obtain an FLD image;
step two: carrying out post-processing analysis on the simulated file, carrying out anticlockwise sectioning on the complex curved surface which is difficult to form, sectioning at an interval of 45 degrees, and sectioning for 4 times to obtain a sectioning line;
step three: marking a plurality of points on the section line plate material at equal distances, and recording the distances;
step four: marking a plurality of points on the section line male die at equal distances, and recording the distances;
step five: and (3) mapping a target point on the section line on the convex die by combining a finite element discretization idea to obtain an ideal point, representing the die attachment by using the distance between the target point and the ideal point, wherein the closer the die attachment is to 100%, the better the die attachment is, and the worse the die attachment is.
The relation between the sticking model property and each mapping node is as follows:
wherein eta represents the sticking model property, and the actual distance between the target point and the ideal point is defined as A i And the projection distance from the node on the male die to the starting position of the plate is defined as B i And n is the number of nodes.
The method is used for detecting the bonding condition of the fender punch and the plate when the punched fender punch is not rebounded. The fender model file in the iges format and shown in the figure 1 is imported into numerical simulation software to be selected and automatically set, and the fender model file is submitted to an LS-dyna solver to be solved after the setting is finished. And after the solution is completed, opening the post-processing module, observing an FLD image of the post-processing module, and selecting a part which is difficult to form for sectioning. The cutting is carried out anticlockwise, and the cutting angles are respectively 0 degrees, 45 degrees, 90 degrees and 135 degrees. The cutting lines shown in fig. 2, 3, 4 and 5 were obtained.
To the sticking moldThe sufficient place is that the equal distance on the terrace die picks the point that the reflection is on the sheet material in the direction of the z axle. The distance between two points on the male die is defined as A i The distance between the upper and lower opposite points of the plate and the male die is defined as B i By measuring to obtain A i And B i Substituting the data into a formula to obtain a relational expression between the sticking property and each point, wherein the relational expression is as follows:
wherein eta represents the sticking property, and the actual distance between the target point and the ideal point is defined as A i And the projection distance from the node on the convex die to the starting position of the plate is defined as B i And n is the number of the nodes, and the sticking performance of the left upper corner of the fender is calculated to be 78% by substituting the number into a formula, which indicates that the sticking effect is not ideal.
Claims (5)
1. A method for rapidly detecting the sticking property of a complex curved surface is characterized by comprising the following steps:
the method comprises the following steps: establishing a three-dimensional solid model according to the geometric dimension of the mold to be designed, and importing the model into finite element software for molding simulation to obtain an FLD image;
step two: carrying out post-processing analysis on the simulated file, carrying out anticlockwise sectioning on the complex curved surface which is difficult to form, and sectioning at an interval of 45 degrees for 4 times to obtain a sectioning line;
step three: marking a plurality of points on the section line plate material at equal distances, and recording the distances;
step four: marking a plurality of points on the section line male die at equal distances, and recording the distances;
step five: and (3) mapping a target point on the section line on the convex die by combining a finite element discretization idea to obtain an ideal point, representing the die attaching performance by using the distance between the target point and the ideal point, and quantizing the concrete degree of the curved surface die attaching through a relational expression, wherein the closer the die attaching performance is to 100%, the better the die attaching performance is, and the worse the die attaching performance is.
2. The method for rapidly detecting the sticking property of the complex curved surface according to claim 1, wherein the three-dimensional solid model in the step one is in an iges format.
3. The method for rapidly detecting the sticking property of the complex curved surface according to claim 1, wherein the cutting position in the second step is a part of the complex curved surface, which has a high bulge and is difficult to stick.
4. The method for rapidly detecting the sticking property of the complex curved surface according to claim 1, wherein the cutting angle in the step two is counterclockwise 0 °, 45 °, 90 ° and 135 °.
5. The method for rapidly detecting the sticking property of the complex curved surface according to claim 1, wherein the quantization is performed through a relational expression in the fifth step, and the specific relational expression is as follows:
wherein eta represents the sticking model property, and the actual distance between the target point and the ideal point is defined as A i And the projection distance from the node on the male die to the starting position of the plate is defined as B i And n is the number of nodes.
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