JP2007039801A - Simulation method for occurrence of air pocket in object to be coated and program which can be performed by computer capable of executing the simulation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify analysis processing and to efficiently perform simulation of an occurrence of an air pocket arising in an object to be coated when applying the coating to the object to be coated by dipping the object to be coated into a liquid coating material. <P>SOLUTION: The method is provided with a first step of dividing the data on the shape of the object to be coated dipped in the coating material tank to a plurality of two-dimensional elements; a second step of setting a prescribed element as an initial boundary element and setting an element having a common nodal point with the initial boundary element as an adjacent element; a third step of analyzing the adjacent element by the initial boundary element; a forth step of setting the analyzed adjacent element as a secondary boundary element and setting an element having a common nodal point with the secondary boundary element as the adjacent element; a fifth step of analyzing the adjacent element by the secondary boundary element; and a sixth step that determines whether or not there is a remaining adjacent element in the secondary boundary element, and when there is a remaining adjacent element, the fourth step and the fifth step are repeatedly processed in this order until there is no more remaining adjacent element. When determination is made that there is no more remaining adjacent element, the analysis is stopped. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a simulation method for generating air stagnation in an object to be analyzed in which data on the shape of the object to be immersed in a paint tank is divided into a plurality of elements, and a computer-executable program for executing the simulation method About.

  Like electrodeposition coating in which coating is performed by immersing in a coating tank filled with plating or electrodeposition liquid, which is immersed in a paint tank filled with melted metal such as semiconductors and automobile bodies. Such a coating method is advantageous in that the coating film can be made substantially uniform, and the welded portion of the object to be coated can also be painted. On the other hand, if the part has a complicated shape, it can be a recess that can be formed in the gap. Has the disadvantage that it cannot be formed.

Therefore, an immersion process is performed after the shape of the object to be coated is appropriately designed so that air accumulation does not occur (see, for example, Patent Document 1).
JP 10-45037 A

  By the way, the presence or absence of an air pocket generated in an object to be coated can be determined in advance by a known analysis method using a free surface. However, in the past, analysis has been performed by dividing the shape data to be analyzed into three-dimensional elements, so in cases where the shape of the object to be painted is complex, such as a car body, analysis processing is not possible. Because of the complexity, it took a long time to simulate the location where air pockets occurred.

  SUMMARY OF THE INVENTION An object of the present invention is to simplify an analysis process, thereby efficiently performing a simulation of the occurrence of air stagnation that occurs in an object to be coated when the object is immersed in a liquid paint and applied.

  In order to solve the above-mentioned problem, a first invention according to a simulation method for generating air stagnation in an object to be coated is a first invention in which data on the shape of an object to be coated immersed in a paint tank is divided into a plurality of two-dimensional elements. A step of setting an element located at an end or a hole of the object to be coated among the divided elements as an initial boundary element, and setting an element sharing a node with the initial boundary element as an adjacent element A third step of analyzing the adjacent element set in the second step using the initial boundary element, and the adjacent element analyzed in the third step as a secondary boundary element A fourth step of setting an element sharing a node with the secondary boundary element as an adjacent element, and setting the adjacent element set in the fourth step as the secondary boundary element A fifth step of analyzing using the above, and whether there is an adjacent element adjacent to the secondary boundary element, and if it is determined that there is an adjacent element adjacent to the secondary boundary element, When it is determined that there is no adjacent element adjacent to the secondary boundary element by repeating the processing of each step in the order of the fourth step and the fifth step until there is no adjacent element adjacent to the secondary boundary element Comprises a sixth step of terminating the analysis.

  According to a second aspect of the present invention, in the first aspect of the simulation method for the occurrence of air stagnation in an object to be coated, in the third step and the fifth step, the initial boundary element and the secondary boundary element are adjacent to the adjacent boundary element. If the height of the center of gravity of the initial boundary element or the secondary boundary element is higher than the height of the center of gravity of the adjacent element, the adjacent element is Judging that it is a liquid paint, if the height of the center of gravity of the initial boundary element or the secondary boundary element is lower than the height of the center of gravity of the adjacent element, it is determined that the adjacent element is air Features.

  3rd invention is 1st invention which concerns on the air pocket generation | occurrence | production simulation method in a to-be-coated object, In said 3rd step and said 5th step, said initial boundary element and said secondary boundary element, When the height of the highest node of each of the elements is compared with the adjacent element, and the height of the highest node of the initial boundary element or the secondary boundary element is higher than the height of the highest node of the adjacent element, the adjacent element If the height of the highest node of the initial boundary element or the secondary boundary element is lower than the height of the highest node of the adjacent element, the adjacent element is determined to be air. It is characterized by.

  According to a fourth aspect of the present invention, in any one of the first to third aspects of the method for simulating the occurrence of air accumulation in an object to be coated, the object to be coated is a vehicle body.

  According to a fifth aspect of the invention, there is provided a computer executable program for executing a method for simulating the occurrence of air stagnation in an object to be coated. In a computer-executable program, a first step of dividing the shape data of the object to be coated into a plurality of two-dimensional elements, and an end portion or a hole of the object to be painted among the divided elements. A second step of setting a positioned element as an initial boundary element, and setting an element sharing a node with the initial boundary element as an adjacent element; and the adjacent element set by execution of the second step A third step of analyzing using an initial boundary element; and after execution of the third step, the adjacent element whose analysis has been completed is designated as a secondary boundary element. A fourth step of setting an element sharing a node with the secondary boundary element as an adjacent element, and using the secondary boundary element to determine the adjacent element set by execution of the fourth step A fifth step of analyzing and determining whether there is an adjacent element adjacent to the secondary boundary element; and if determining that there is an adjacent element adjacent to the secondary boundary element, the secondary boundary The execution of each step is repeated in the order of the fourth step and the fifth step until there is no adjacent element adjacent to the element, and analysis is performed when it is determined that there is no adjacent element adjacent to the secondary boundary element. And a sixth step of ending.

  According to a sixth aspect of the present invention, in the fifth aspect of the computer-executable program for executing the method of simulating the occurrence of air stagnation in an object to be coated, the initial boundary element is the third step and the fifth step. And comparing the height of the center of gravity of each of the secondary boundary element and the adjacent element, and the height of the center of gravity of the initial boundary element or the secondary boundary element is the height of the center of gravity of the adjacent element. When the height is higher than the height, it is determined that the adjacent element is a liquid paint. When the height of the center of gravity of the initial boundary element or the secondary boundary element is lower than the height of the center of gravity of the adjacent element, the adjacent element Is characterized in that it is air.

  According to a seventh aspect of the present invention, in the fifth aspect of the computer-executable program for executing the method for simulating air stagnation in an object to be coated, in the third step and the fifth step, the initial boundary element And the secondary boundary element and the adjacent element are compared with the height of the highest node of each element, and the height of the highest node of the initial boundary element or the secondary boundary element is the highest node of the adjacent element. If the height of the adjacent element is higher than the height of the adjacent boundary element, it is determined that the adjacent element is a liquid paint, and if the height of the highest node of the initial boundary element or the secondary boundary element is lower than the height of the highest node of the adjacent element It is characterized by determining that the element is air.

  According to an eighth aspect of the present invention, in any one of the fifth to seventh aspects of the invention relating to a computer-executable program for executing the method of simulating the occurrence of air stagnation in an object to be painted, the object to be painted is a vehicle body. Features.

  According to the first invention or the fifth invention, the analysis target shape data is decomposed into a plurality of two-dimensional elements, and the analysis target shape data is decomposed into a three-dimensional element. Thus, the analysis process becomes simpler than the analysis, and the analysis time can be shortened as compared with the conventional method.

  Further, according to the first or fifth invention, the shape data of the object to be coated is analyzed by dividing it into two-dimensional elements, so compared with the case of dividing into three-dimensional elements, the initial data Since the calculation time from the state to the convergence state can be drastically reduced, the position of the air reservoir can be simulated in a short time by numerical calculation without actually immersing the object to be painted in the paint tank. can do.

  Further, according to the first or fifth invention, when a calculation result indicating that air accumulation occurs is obtained, a model obtained by drilling or changing the shape of the object to be coated is changed to perform analysis again. In addition, it is possible to predict the shape of the object to be coated in which no air accumulation occurs, and to promptly feed back to the design of the object to be painted. Thereby, the cost and schedule required for the development of the object to be coated can be shortened.

  In addition, according to the first or fifth invention, since the analysis is performed by dividing the data of the shape to be analyzed into two-dimensional elements, the analysis processing is performed in comparison with the case of dividing into three-dimensional elements. It is possible to simplify the analysis of the air pocket generated in the object to be coated when the immersion treatment is performed, and it is possible to easily and quickly determine whether or not the air pool is generated.

  Moreover, according to 1st invention or 5th invention, the formation state of the air pocket in the to-be-painted object put into a coating tank can be grasped | ascertained simulated.

  According to 2nd invention or 6th invention, by comparing the height of the gravity center of the two-dimensional elements which share a node, an analysis of an adjacent element can be performed quickly and there is an air pocket in an object to be coated. It is possible to accurately and easily determine whether or not it occurs.

  According to 3rd invention or 7th invention, by comparing the height of the highest node of the two-dimensional elements which share a node, an analysis of an adjacent element can be performed rapidly and an air pocket is in a to-be-coated object. It is possible to accurately and easily determine whether or not it occurs.

  According to the fourth invention or the eighth invention, it is possible to easily and accurately calculate the amount of the liquid paint used when the vehicle body is immersed in the paint tank for coating.

(First embodiment)
Next, a first embodiment will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples. In the following, a case where electrodeposition coating is performed on a vehicle body will be described as an example. However, a coating method to which the present invention can be applied is not limited to electrodeposition coating, and an object to be coated is a liquid paint. Any coating method may be used as long as it is immersed in the coating method.

  FIG. 1 is a block diagram showing an embodiment of a fluid analyzing apparatus 1 for executing the method for simulating the occurrence of air accumulation in an object to be coated.

  As shown in FIG. 1, the fluid analysis apparatus 1 of this embodiment includes a control unit 5 including a CPU 2, a ROM 3 and a RAM 4, a keyboard controller 9 of a keyboard 6, a display controller 11 of a display 10 as a display unit, and a hard disk. A disk controller 14 of a drive (HDD) 12 and a flexible disk drive (FDD) 13 and a network interface controller 16 for connection to a network 15 are connected to each other via a system bus 19 so as to communicate with each other. Yes.

  The CPU 2 comprehensively controls each component connected to the system bus 19 by executing software stored in the ROM 3 or the hard disk drive 12 or software supplied from the flexible disk drive 13. That is, the CPU 2 reads out the processing program from the ROM 3, the hard disk drive 12, or the flexible disk drive 13 according to a predetermined processing sequence and executes the processing program, thereby performing the operation of the air pool generation simulation method on the object to be coated according to the present embodiment. Control to achieve it. The program may be a program stored in an external storage medium other than the fluid analysis apparatus 1 and read out through communication means.

  The CPU 2 reads the shape data of the member to be analyzed from the hard disk drive 12 and divides the surface into a plurality of elements to construct a two-dimensional numerical calculation model for numerical calculation. Further, the CPU 2 sets an initial boundary element, a secondary boundary element, and an adjacent element.

  Further, the CPU 2 analyzes the adjacent element by comparing the heights of the initial boundary element and the adjacent element. Further, the CPU 2 sets the adjacent element that has been compared with the initial boundary element as the secondary boundary element, determines whether there is an adjacent element adjacent to the secondary boundary element, and analyzes the adjacent element. To do.

  The RAM 4 functions as a main memory or work area for the CPU 2. The keyboard controller 9 controls an instruction input from the keyboard 6 or a pointing device (not shown). The display controller 11 controls display on the display 10. The disk controller 14 controls access to the hard disk drive 12 and the flexible disk drive 13 that store a boot program, various applications, editing files, user files, a network management program, a predetermined processing program in the present embodiment, and the like. The network interface controller 16 transmits and receives data to and from a device or system on the network 15 in both directions.

  The hard disk drive 12 stores data on the body of the body to be analyzed.

  This simulation method for generating air stagnation in an object to be coated is a numerical analysis of the flow of electrodeposition liquid and air during electrodeposition coating of a vehicle body. First, the painting line for the vehicle body will be briefly described with reference to FIG.

  A plurality of vehicle body panels are joined to each other by welding or the like, so that the vehicle body 20 is constructed, and as shown in FIG. 2, the vehicle body 20 is conveyed in a substantially horizontal direction on a painting line while being mounted on a hanger of the conveyance device 21. In the painting line, as a pretreatment for electrodeposition coating, the body panel is subjected to treatments such as degreasing, water washing, surface adjustment, film formation, water washing and the like. After these processes, the vehicle body 20 as the vehicle body descends toward the electrodeposition tank 22 and moves substantially horizontally while being immersed in the electrodeposition liquid 23. In this state, paint is deposited on the vehicle body panel by applying a voltage to the vehicle body 20 and electrodes (not shown) in the electrodeposition tank 22. Thereafter, the vehicle body 20 is pulled up from the electrodeposition tank 22 by the transfer device 21, and the electrodeposition liquid 23 adhering to the vehicle body panel without being electrodeposited is removed by washing.

  Next, a computer program capable of executing the air pocket generation simulation method according to the present invention will be described in detail with reference to FIG. 3 are control programs stored in the ROM 3 or the HDD 12 of the fluid analyzing apparatus 1 of FIG. 1 or supplied from the outside via the network 15, and are executed by the CPU 2. These programs are an element division program P1 for executing the first step in the present invention, a first boundary setting program P2 for executing the second step, a first analysis program P3 for executing the third step, and a fourth It has the 2nd boundary setting program P4 which performs a step, the 2nd analysis program P5 which performs a 5th step, and the determination program P6 which performs a 6th step.

  The element division program (first step) P1 divides the data of the shape of the object immersed in the paint tank into a plurality of two-dimensional elements, and when the elements are divided into a plurality of elements by the element division program P1. The first boundary setting program (second step) P2 is executed. The first boundary setting program P2 sets an element located at the end or hole of the object to be coated among the divided elements as an initial boundary element, and sets an element sharing a node with the initial boundary element as an adjacent element. . The set adjacent element is analyzed by the first analysis program (third step) P3 using the initial boundary element.

  Next, when the analysis by the first analysis program P3 is completed, the second boundary setting program (fourth step) P4 is executed, and the adjacent element whose analysis has been completed is set as the secondary boundary element, and the secondary boundary An element sharing a node with an element is set as an adjacent element. The adjacent elements set by executing the second boundary setting program P4 are analyzed using the secondary boundary elements by the second analysis program (fifth step) P5.

Then, the determination program (sixth step) P6 determines whether there is an adjacent element adjacent to the secondary boundary element, and if it is determined that there is an adjacent element adjacent to the secondary boundary element, When the execution of each program is repeated in the order of the second boundary setting program P4 and the second analysis program P5 until there is no adjacent element adjacent to the secondary boundary element, and it is determined that there is no adjacent element adjacent to the secondary boundary element The analysis ends.
Hereinafter, with reference to the flowchart of FIG. 4, a method for simulating the occurrence of air stagnation in an object to be coated according to this embodiment will be described in detail. In the following, the finite element method is used, and the analysis is performed with the floor panel 26 shown in FIG.

  First, as shown in the flowchart of FIG. 4, the control unit 5 divides the surface of the floor panel 26 shown in FIG. 5 into a plurality of elements 29 as shown in FIG. A model is constructed (step S1).

  Next, after setting all these elements 29 to air as an initial state (step S2), the control unit 5 designates the direction of gravity in the numerical calculation model (step S3).

  That is, the step S2 is a fluid setting step, and the step S3 is an initial setting step. This state schematically represents a state in which the periphery of the floor panel 26 before the vehicle body 20 is put into the electrodeposition tank 22 is filled with air. The above steps S1 to S3 correspond to the element division program P1.

  Then, the element 29 existing at the end or hole of the floor panel 26 is set as an initial boundary element (step S4), and further, an adjacent element to be compared with the boundary element is set (step 5, where the initial boundary is set). An element is an element of an end portion and a hole portion of the floor panel 26 and is an electrodeposition liquid, and an adjacent element is an element sharing a node with an initial boundary element or a secondary boundary element described later. An element that has not yet been compared with an initial boundary element or a secondary boundary element, where a node refers to a point formed by contact of the vertices of each element. , S5 corresponds to the first boundary setting program P2.

  Next, the heights of the center-of-gravity points of the initial boundary element and the adjacent elements in the Z direction are compared (step S6), and the electrodeposition liquid 23 supplies the air 24 to the adjacent elements whose center-of-gravity point is lower than the initial boundary element. It is determined that the electrode has been pushed away and is filled with the electrodeposition liquid 23. On the other hand, it is determined that the air 24 remains in the adjacent element whose center of gravity is higher than the initial boundary element (step S7). The determination is made because the specific gravity of the electrodeposition liquid is larger than the specific gravity of air. As described above, steps S6 and S7 correspond to the first analysis program P3.

  This will be specifically described. When the element 29C shown in FIGS. 7A and 7B is the initial boundary element and the element A sharing the node α is an adjacent element, the height in the Z direction of the centroid of the initial boundary element 29C and the centroid of the adjacent element A When the height of the center of gravity of the adjacent element 29A is lower than the height of the center of gravity of the initial boundary element 29C, the adjacent element 29A is determined as the electrodeposition liquid. On the other hand, when the height of the center of gravity of the adjacent element 29A is higher than the height of the center of gravity of the initial boundary element 29C, the adjacent element 29A is determined as air. This comparison method is the same when comparing a secondary boundary element and an adjacent element described later.

  Next, the adjacent element that has been compared with the initial boundary element is set as a secondary boundary element (step S8), and it is determined whether there is an adjacent element adjacent to the newly set secondary boundary element (step S8). S9). Here, the secondary boundary element refers to an element that has been compared with the initial boundary element or another secondary boundary element. As described above, step S8 corresponds to the second boundary setting program P4.

  If it is determined that there is no adjacent element, (NO) analysis is terminated. On the other hand, if it is determined that there is an adjacent element (YES), the height of the center of gravity of each of the secondary boundary element and the adjacent element is compared, and the adjacent element is analyzed (step S10). When the height of the center of gravity of the element is lower than the height of the center of gravity of the secondary boundary element to be compared, it is determined as the electrodeposition liquid 23, and the height of the center of gravity of the adjacent element is the height of the secondary boundary element to be compared. If it is higher than the height of the barycentric point, it is judged as air 24 (step S11), and the adjacent element whose analysis has been completed is set as a secondary boundary element (step S12). As described above, step S9, step S10, step S11, and step S12 correspond to the second analysis program P5.

  Next, it is determined whether there is an adjacent element adjacent to the newly set secondary boundary element (step S13). If it is determined that there is an adjacent element (YES), the height of the center of gravity of each of the secondary boundary element and the adjacent element is compared to analyze the adjacent element (step S10), and it is determined that there is no adjacent element. If so (NO), the analysis is terminated. As described above, step S13 corresponds to the determination program P6.

  In addition, when there are multiple initial boundary elements and secondary boundary elements from the viewpoint of adjacent elements, all of the initial boundary elements or secondary boundary elements are compared with those of the initial boundary elements or secondary boundary elements that are electrodeposition liquids. When it is determined that it is lower than any one, it is determined that the adjacent element is an electrodeposition liquid.

  As described above, according to the invention according to the first embodiment, since the floor panel 26 is divided into two-dimensional elements for analysis, compared to the case where the floor panel 26 is divided into three-dimensional elements, the convergence state is from the initial state. It is possible to drastically reduce the calculation time to reach Thereby, the position of the air reservoir can be predicted in a short time by numerical calculation without actually putting the prototype car into the electrodeposition tank.

  In addition, by comparing the height of the center of gravity of two-dimensional elements that share nodes, it is possible to quickly analyze adjacent elements and accurately and easily determine whether there is any air accumulation in the object to be painted. Can be done.

  Compared to the case where an element sharing an "edge" with an initial boundary element or secondary boundary element is used as an adjacent element by making the element sharing the "node" with the initial boundary element or secondary boundary element an adjacent element. As a result, the number of elements to be compared increases, and a more accurate determination can be made.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. However, the second embodiment will be described with a focus on differences from the first embodiment. In the second embodiment, the definitions of the initial boundary element, the secondary boundary element, and the adjacent element are the same as those in the first embodiment.

  Hereinafter, the method for simulating the occurrence of air accumulation in the object to be coated according to the present embodiment will be described in detail with reference to the flowchart of FIG. In the second embodiment as well, the finite element method is used, and analysis is performed using a floor panel 26 as shown in FIG.

  First, as shown in the flowchart of FIG. 8, the controller 5 divides the surface of the floor panel 26 shown in FIG. 5 into a plurality of elements 29 as shown in FIG. A model is constructed (step S21).

  Subsequently, after setting all these elements 29 as air as an initial state (step S22), the control unit 5 designates the direction of gravity in the numerical calculation model (step S23).

  That is, the step S22 is a fluid setting step, and the step S23 is an initial setting step. This state schematically represents a state in which the periphery of the floor panel 26 before the vehicle body 20 is put into the electrodeposition tank 22 is filled with air.

  Then, the element 29 existing at the end or hole of the floor panel 26 is set as an initial boundary element (step S24), and an adjacent element to be compared with the initial boundary element is set (step S25). The height in the Z direction of each highest node of the initial boundary element and the adjacent element is compared (step S26), and the electrodeposition liquid 23 enters the element whose position of the highest node is lower than the initial boundary element by pushing the air 24 away. And filled with the electrodeposition liquid 23. On the other hand, if the position of the highest node of the adjacent element to be compared is lower than the position of the highest node of the initial boundary element, it is assumed that air 24 remains (step S27). Here, the highest node means the node having the highest height in the Z direction among the nodes of the element.

  This will be specifically described. 9A and 9B, when the element 29G is the initial boundary element and the element A sharing the node α is an adjacent element, the highest node η of the initial boundary element 29G and the highest node α of the adjacent element 29E are used. When the height of α is lower than the height of η, the adjacent element 29E is determined to be an electrodeposition liquid. On the other hand, the height in the Z direction of the highest node η of the initial boundary element 29G and the highest node α of the adjacent element 29E is compared, and if the height of α is higher than the height of η, the adjacent element 29E To be judged. This comparison method is the same when comparing a secondary boundary element and an adjacent element described later.

  Next, the adjacent element that has been compared with the initial boundary element is set as a secondary boundary element (step S28), and it is determined whether there is an adjacent element adjacent to the secondary boundary element (step S29). If it is determined that there is no adjacent element, (NO) analysis is terminated. On the other hand, if it is determined that there is an adjacent element (YES), the adjacent element is analyzed by comparing the heights of the highest nodes of the secondary boundary element and the adjacent element (step S30). If the height of the highest node is lower than the highest node of the secondary boundary element to be compared, it is judged as electrodeposition liquid, and the height of the highest node of the adjacent element is the highest of the secondary boundary element to be compared. If it is higher than the height of the node, it is determined as air (step S31), and the adjacent element whose analysis has been completed is set as a secondary boundary element (step S32).

  Next, it is determined whether there is an adjacent element adjacent to the newly set secondary boundary element (step S33). When it is determined that there is an adjacent element (YES), the heights of the secondary boundary element and the adjacent element are compared to analyze the adjacent element (step S30), and when it is determined that there is no adjacent element (NO) ends the analysis.

  In the invention according to the second embodiment as well, when there are a plurality of initial boundary elements and secondary boundary elements when viewed from adjacent elements, the initial boundary elements are compared with all the initial boundary elements or secondary boundary elements. Or when it is judged that it is lower than any one of the secondary boundary elements which are electrodeposition liquids, the adjacent element is judged to be an electrodeposition liquid.

  As described above, according to the invention according to the second embodiment, the vehicle body panel is divided into two-dimensional elements and analyzed in the same manner as the invention according to the first embodiment. In comparison, the calculation time from the initial state to the convergence state can be drastically reduced. Thereby, the position of the air reservoir can be predicted in a short time by numerical calculation without actually putting the prototype car into the electrodeposition tank 22.

  In addition, by comparing the height of the highest node between two-dimensional elements that share nodes, it is possible to quickly analyze adjacent elements and accurately and easily determine whether or not air is trapped in the workpiece. Can be done.

  The technique described in the claims is not limited to the electrodeposition coating of the vehicle body as described above, but can be applied to, for example, a processing tank and a cleaning process in a plating process.

It is a schematic block diagram of a fluid analyzer. It is a schematic explanatory drawing of the painting line of a vehicle body. It is explanatory drawing of each control program. It is a flowchart of the air pool generation | occurrence | production simulation method in the to-be-coated object which concerns on 1st Embodiment. It is a schematic perspective view of a floor panel. It is the figure which divided | segmented the floor panel into the two-dimensional element. (A) is the figure which extracted a part of two-dimensional element of a floor panel, (b) is a top view of the element of (a). It is a flowchart of the air reservoir generation | occurrence | production simulation method in the to-be-coated object which concerns on 2nd Embodiment. (A) is the figure which extracted a part of two-dimensional element of a floor panel, (b) is a top view of the element of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid analyzer 5 Control part 20 Car body 22 Electrodeposition tank 23 Electrodeposition liquid 24 Air 26 Floor panel 29 Element

Claims (8)

A first step of dividing the shape data of an object immersed in the paint tank into a plurality of two-dimensional elements;
A second step of setting an element located at an end or a hole of the object to be painted among the divided elements as an initial boundary element, and setting an element sharing a node with the initial boundary element as an adjacent element; ,
A third step of analyzing the neighboring element set in the second step using the initial boundary element;
A fourth step of setting the adjacent element analyzed in the third step as a secondary boundary element, and setting an element sharing a node with the secondary boundary element as an adjacent element;
A fifth step of analyzing the adjacent element set in the fourth step using the secondary boundary element;
It is determined whether there is an adjacent element adjacent to the secondary boundary element, and if it is determined that there is an adjacent element adjacent to the secondary boundary element, there is no adjacent element adjacent to the secondary boundary element. Until the fourth step and the fifth step are repeated until the fourth step and the sixth step of ending the analysis when it is determined that there is no adjacent element adjacent to the secondary boundary element A method for simulating the occurrence of air stagnation in an object to be coated. In the third step and the fifth step,
The initial boundary element and the secondary boundary element and the adjacent element are compared with the height of the center of gravity of each element,
If the height of the center of gravity of the initial boundary element or the secondary boundary element is higher than the height of the center of gravity of the adjacent element, it is determined that the adjacent element is a liquid paint,
The adjacent element is determined to be air if the height of the center of gravity of the initial boundary element or the secondary boundary element is lower than the height of the center of gravity of the adjacent element. Method for generating air stagnation in objects to be painted. In the third step and the fifth step,
The initial boundary element, the secondary boundary element, and the adjacent element are compared with the height of the highest node of each element,
When the height of the highest node of the initial boundary element or the secondary boundary element is higher than the height of the highest node of the adjacent element, it is determined that the adjacent element is a liquid paint,
The adjacent element is determined to be air if the height of the highest node of the initial boundary element or the secondary boundary element is lower than the height of the highest node of the adjacent element. Method for generating air stagnation in objects to be painted.   The said object to be coated is a vehicle body, The method for simulating the accumulation of air in the object to be coated according to any one of claims 1 to 3. In a computer-executable program that simulates the occurrence of air pockets using data on the shape of an object to be immersed in a paint tank,
A first step of dividing the shape data of the object to be coated into a plurality of two-dimensional elements;
A second step of setting an element located at an end or a hole of the object to be painted among the divided elements as an initial boundary element, and setting an element sharing a node with the initial boundary element as an adjacent element; ,
A third step of analyzing the neighboring element set by execution of the second step using the initial boundary element;
After the execution of the third step, a fourth step of setting the adjacent element that has been analyzed as a secondary boundary element, and setting an element that shares a node with the secondary boundary element as an adjacent element;
A fifth step of analyzing the adjacent element set by execution of the fourth step using the secondary boundary element;
It is determined whether there is an adjacent element adjacent to the secondary boundary element, and if it is determined that there is an adjacent element adjacent to the secondary boundary element, there is no adjacent element adjacent to the secondary boundary element. A sixth step of repeating the execution of each step in the order of the fourth step and the fifth step until the analysis is terminated when it is determined that there is no adjacent element adjacent to the secondary boundary element; A computer-executable program for executing a method for simulating the occurrence of air stagnation in an object to be coated. In the third step and the fifth step,
The initial boundary element and the secondary boundary element and the adjacent element are compared with the height of the center of gravity of each element,
If the height of the center of gravity of the initial boundary element or the secondary boundary element is higher than the height of the center of gravity of the adjacent element, it is determined that the adjacent element is a liquid paint,
The said adjacent element is judged to be air when the height of the centroid of the said initial boundary element or the said secondary boundary element is lower than the height of the centroid of the said adjacent element. A computer-executable program for executing a simulation method for generating air stagnation in an object to be coated. In the third step and the fifth step,
The initial boundary element, the secondary boundary element, and the adjacent element are compared with the height of the highest node of each element,
When the height of the highest node of the initial boundary element or the secondary boundary element is higher than the height of the highest node of the adjacent element, it is determined that the adjacent element is a liquid paint,
The adjacent element is determined to be air if the height of the highest node of the initial boundary element or the secondary boundary element is lower than the height of the highest node of the adjacent element. A computer-executable program for executing a simulation method for generating air stagnation in an object to be coated.   The computer-executable program for executing the simulation method for generating air stagnation in an object to be coated according to any one of claims 5 to 7, wherein the object to be painted is a vehicle body.

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