JP5372528B2 - Simulation apparatus, simulation method, and simulation program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To predict dripping of a coating material adhered to an article to be coated such as a vehicle body. <P>SOLUTION: Nodal points adjacent to each element are set eachry each element based on a numerical calculation model in which an article to be coated is divided into a plurality of elements (Step S3). The inclination angle &alpha; between adjacent nodal points is calculated based on the gravity direction (Step S8). The coating material flow-out amount V<SB>out</SB>and the coating material flow-in amount V<SB>in</SB>at each nodal point are calculated based on the inclination angle &alpha; between adjacent nodal points and the temperature applied to the vehicle body (Steps S9, 10). Subsequently, the adhesion amount V<SB>t+1</SB>of the coating material at each nodal point after a predetermined time is calculated based on the initial adhesion amount V<SB>0</SB>, the coating material flow-out amount V<SB>out</SB>and the coating material flow-in amount V<SB>in</SB>(Step S11). Thereby, it becomes possible to predict the dripping of the coating material adhered to the vehicle body while taking account of viscosity change of the coating material associated with temperature change, by repeatedly performing the steps. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a prediction technique for predicting dripping of a paint adhering to an object to be coated.

  When painting a car body with a complicated shape, the paint is applied to the inner panel and outer panel of the car body by applying a voltage between the car and the car body while sinking the car body in the paint tank. Electrodeposition coating for forming an electrodeposition film is applied. After the electrodeposition coating, the paint remaining on the surface of the electrodeposited film and the paint accumulated in the gaps are washed away by the water washing process, and high temperature baking is performed to carry the vehicle body into a drying furnace and cure the electrodeposited film. Is done.

  By the way, when high-temperature baking is performed without sufficiently washing away the residual paint, there is a possibility that a coating defect due to dripping of the heated paint, so-called secondary sagging, may occur. The occurrence of such secondary sagging has been a factor that increases the manufacturing cost of automobiles because repairs such as polishing work and painting work are required. Therefore, in order to reliably remove the excess paint remaining on the vehicle body, a manufacturing method for removing the residual paint with a vacuum device (see, for example, Patent Document 1), or a manufacturing method for removing the residual paint by ultrasonic vibration ( For example, see Patent Document 2).

JP-A-5-93298 JP-A-5-93299

  However, the manufacturing method described in Patent Document 1 and Patent Document 2 is a method of adding a new process in order to remove residual paint, and has been a factor that increases the manufacturing cost of automobiles. In addition, measures to eliminate quality degradation due to secondary sagging include not only a vacuum device and a method of removing residual paint by ultrasonic vibration, but also a position that does not affect paint quality by improving the body structure. A method of leading the secondary sauce is also conceivable. In this way, in order to eliminate the problem caused by the secondary sagging by focusing on the car body structure, a quality deterioration due to the secondary sagging is caused by developing a simulation technique for predicting the occurrence of the secondary sagging from the car body structure. It is desired to design a body structure that does not have any problems.

  An object of the present invention is to predict the dripping of the paint adhering to an object to be painted such as a vehicle body.

  The simulation apparatus of the present invention is a simulation apparatus for predicting dripping of the paint attached to an object to be coated, and based on a numerical calculation model of the object to be painted divided into a plurality of elements, for each node included in the element. An adjacent node setting means for setting a node adjacent thereto, an inclination angle calculating means for calculating an inclination angle between the adjacent nodes on the basis of the direction of gravity acting on the object, and the object to be coated Based on the acting temperature and the inclination angle between the nodes, movement amount calculating means for calculating the amount of paint movement between the nodes after a predetermined time, and each node after the predetermined time based on the paint movement amount It has an adhesion amount calculation means for calculating the paint adhesion amount in the above and an adhesion amount display means for displaying the paint adhesion amount on the outside.

  The simulation apparatus of the present invention is characterized in that the object to be coated is a vehicle body carried into a heating and drying furnace after electrodeposition coating.

  The simulation method of the present invention is a simulation method for predicting the dripping of the paint adhering to the object to be coated, and based on the numerical calculation model of the object to be painted divided into a plurality of elements, for each node included in the element. An adjacent node setting step for setting a node adjacent to the object, an inclination angle calculating step for calculating an inclination angle between the adjacent nodes based on the direction of gravity acting on the object, and the object to be coated Based on the acting temperature and the inclination angle between the nodes, a movement amount calculating step for calculating the amount of paint movement between the nodes after a predetermined time, and each node after the predetermined time based on the paint movement amount And an adhesion amount calculating step for calculating the adhesion amount of paint and an adhesion amount displaying step for displaying the adhesion amount of the paint on the outside.

  The simulation method of the present invention is characterized in that the object to be coated is a vehicle body carried into a heating and drying furnace after electrodeposition coating.

  The simulation program of the present invention is a simulation program for predicting the dripping of the paint adhering to the object to be coated, and for each node included in the element based on the numerical calculation model of the object to be painted divided into a plurality of elements. An adjacent node setting step for setting a node adjacent to the object, an inclination angle calculating step for calculating an inclination angle between the adjacent nodes based on the direction of gravity acting on the object, and the object to be coated Based on the acting temperature and the inclination angle between the nodes, a movement amount calculating step for calculating the amount of paint movement between the nodes after a predetermined time, and each node after the predetermined time based on the paint movement amount And an adhesion amount calculating step for calculating the adhesion amount of paint and an adhesion amount displaying step for displaying the adhesion amount of the paint on the outside.

  The simulation program of the present invention is characterized in that the object to be coated is a vehicle body carried into a heating and drying furnace after electrodeposition coating.

  According to the present invention, since the amount of paint movement between adjacent nodes is calculated based on the inclination angle between adjacent nodes and the temperature acting on the object to be coated, the viscosity change of the paint accompanying the temperature change It is possible to predict the dripping of the paint adhering to the object to be coated while considering the above. This makes it possible to specify a structure for obtaining good coating quality without producing a prototype of the object to be coated.

It is the schematic which shows the coating line of a vehicle body. It is a block diagram which shows the simulation apparatus which is one embodiment of this invention. It is a flowchart which shows the procedure of the simulation method performed by a simulation apparatus. It is a perspective view which shows the numerical calculation model of a vehicle body. It is the schematic diagram which extracted the some element which comprises a numerical calculation model partially. (A) is explanatory drawing which shows the control area of a node, (B) is explanatory drawing which shows the distance between nodes. (A)-(C) is explanatory drawing which shows the inclination | tilt angle between nodes. (A) is explanatory drawing which shows the coating material outflow amount of a node, (B) is explanatory drawing which shows the coating material inflow amount of a node. It is a flowchart which shows the procedure at the time of performing a dripping determination process. It is the schematic which shows a lower surface side element.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing a coating line 11 of a vehicle body 10, and FIG. 1 shows a coating line 11 from an electrodeposition coating process to a baking process. As shown in FIG. 1, in the electrodeposition coating process, a treatment tank 12 for applying electrodeposition coating to a vehicle body 10 as an object to be coated is provided. The treatment tank 12 is filled with an electrodeposition paint, and the vehicle body 10 suspended from the hanger 13 is submerged in the treatment tank 12 during painting. An electrode (not shown) is disposed in the treatment tank 12, and by applying a voltage to the vehicle body 10 and the electrode, an electrodeposition coating film is formed on the outer panel or the inner panel of the vehicle body 10. . Then, the vehicle body 10 pulled up from the treatment tank 12 is guided to a water washing process including a plurality of spray nozzles 14. In this water washing step, excess paint or dust adhering to the vehicle body 10 is removed by spraying the cleaning liquid from the spray nozzle 14 toward the vehicle body 10. Subsequently, the vehicle body 10 that has passed through the water washing step is carried into an oven 15 that is a heating and drying furnace. By applying infrared heating or hot air heating to the vehicle body 10 passing through the oven 15, the vehicle body 10 can be heated to a predetermined baking temperature to cure the electrodeposition coating film and fix it to the vehicle body 10. It has become. In addition, in order to suppress the outflow of the heated air and to improve energy efficiency, the intermediate part of the oven 15 is installed in the high position.

  By the way, although the extra paint is removed from the vehicle body 10 by providing the water washing step, it is difficult to completely remove the extra paint. And when the vehicle body 10 with the excess paint adhered is heated in the oven 15, there is a possibility that a coating defect due to a drop in the viscosity of the paint and dripping, so-called secondary sagging may occur. That is, when the vehicle body 10 is heated by the oven 15, not only the paint and the steel plate attached to the outside of the vehicle body are heated, but also the paint attached to the inside of the vehicle body and the accumulated paint are heated by heat conduction. It will be. In this way, heating the paint that has adhered or accumulated has caused a reduction in the surface tension of the paint and causes secondary sagging of the paint. In particular, boiling the paint in the vicinity of 90 ° C. to 100 ° C. has been a factor in causing a large secondary sagging by increasing the moving speed and moving amount of the paint. The occurrence of such secondary sagging has been a factor that increases the manufacturing cost of the vehicle because it requires repair such as polishing work and painting work. As a measure for solving the problem caused by the secondary sagging, there is a method of improving the vehicle body structure to guide the secondary sagging to a part that does not affect the coating quality. As described above, in order to solve the problem caused by the secondary sagging by paying attention to the car body structure, it is desired to predict the occurrence of the secondary sagging from the car body structure in order to suppress the development cost of trial production and the like. . Hereinafter, a simulation method for predicting dripping of the paint adhering to the vehicle body 10 will be described.

  FIG. 2 is a block diagram showing a simulation apparatus 20 according to an embodiment of the present invention. As shown in FIG. 2, the simulation apparatus 20 is provided with a keyboard 21, a display 22, an HDD (hard disk drive) 23, an FDD (flexible disk drive) 24, and the like. Further, the simulation device 20 is provided with a control unit 28 including a CPU 25, a ROM 26 and a RAM 27. The control unit 28 includes an adjacent node setting unit, an inclination angle calculation unit, a movement amount calculation unit, an adhesion amount calculation unit, It functions as an adhesion amount display means. The simulation apparatus 20 is provided with a keyboard controller 29, a display controller 30, a disk controller 31, and an interface controller 32. Further, the control unit 28 and the various controllers 29 to 32 can communicate with each other via the system bus 33.

  The CPU 25 can control various devices connected to the system bus 33 by executing a simulation program stored in the ROM 26 or the HDD 23 or a simulation program supplied from the FDD 24. The RAM 27 functions as a main memory or work area for the CPU 25. The keyboard controller 29 converts an input signal from the keyboard 21, and the display controller 30 controls the display state of the display 22. The disk controller 31 controls the access state of the HDD 23 and the FDD 24. The interface controller 32 controls data transmission / reception with a device (not shown) connected to the network 34.

FIG. 3 is a flowchart showing the procedure of the simulation method executed by the simulation apparatus 20. As shown in FIG. 3, in step S1, various calculation condition data are read. As the calculation condition data, the simulation execution interval (for example, 100 second interval), the simulation end time Te (for example, 3600 second), the temperature condition of the oven 15 (for example, 60 ° C. for 0 to 200 seconds, 200 to 200 ° C.) 100 ° C. up to 600 seconds, 170 ° C. up to 600 to 3600 seconds), transport angle conditions of the vehicle body 10 (for example, 30 ° to 0 to 200 seconds with respect to the horizontal direction, and 200 to 3400 seconds with respect to the horizontal direction) 0 °, up to 3400-3600 seconds, -30 ° with respect to the horizontal direction), initial film thickness th of the paint adhering to the electrodeposition coating film, critical fall amount V _{c of the} adhering paint falling from the vehicle body 10, etc. Is loaded.

  In the subsequent step S2, the numerical calculation model 40 of the vehicle body 10 is read as vehicle body data. 4 is a perspective view showing the numerical calculation model 40 of the vehicle body 10, and FIG. 5 is a schematic diagram partially extracting a plurality of elements constituting the numerical calculation model 40. As shown in FIG. As shown in FIG. 5, a two-dimensional numerical calculation model 40 is constructed by dividing a panel member constituting the vehicle body 10 into a plurality of elements by a finite element method. As this numerical calculation model 40, for example, a two-dimensional numerical calculation model 40 used in a vehicle body collision deformation simulation or the like can be used. Also, as shown in FIG. 5, nodes are arranged at the vertices of each element included in the numerical calculation model 40, and an X coordinate value, a Y coordinate value, and a Z coordinate value are specified for each node. Although a two-dimensional numerical calculation model is used as the numerical calculation model 40 of the vehicle body 10, the present invention is not limited to this, and a three-dimensional numerical calculation model may be used. In addition, the shape of the element included in the numerical calculation model is not limited to a quadrangular shape, and may be another shape as long as it has three or more nodes such as a triangular shape.

  In step S3, adjacent nodes are set for each node (adjacent node setting step). Here, the adjacent node is a node provided in an element sharing the focused node. That is, as shown in FIG. 5, when attention is paid to node 1, nodes 2 to 9 included in elements I to IV sharing node 1 are adjacent nodes. With this procedure, the relationship between all nodes and the adjacent nodes is specified.

  In step S4, the dominant area S is calculated for each node, and the inter-node distance L between adjacent nodes is calculated. Here, FIG. 6A is an explanatory diagram showing the dominant area S of the node 1, and FIG. 6B is an explanatory diagram showing the inter-node distance L between the nodes 1 and 8. As shown in FIG. 6 (A), the control area S of the node 1 is partitioned by connecting intermediate positions with the adjacent nodes 2 to 9. The dominant area S at each node may be calculated by other methods. Further, as shown in FIG. 6B, the inter-node distance L is calculated based on the coordinate values of the nodes 1 and 8.

Subsequently, in step S5, by multiplying the initial film thickness th of the dominant area S and coatings of each node, the initial adhesion amount V ₀ which paint in each node is calculated. The initial adhesion amount V ₀ is an adhesion amount of the paint remaining on the electrodeposition coating film of the vehicle body 10 and is an adhesion amount of the paint that can cause secondary sagging. Note that the initial film thickness th used when calculating the initial adhesion amount V ₀ is obtained in advance by experiments or the like. Subsequently, the initial adhesion amount V ₀ at step S6 is stored as the current coating weight V _t, resetting of the timer t for measuring the simulation time step S7 is performed.

  Subsequently, in step S8, an inclination angle α with respect to the horizontal plane is calculated for each adjacent node based on the coordinate value of each node (inclination angle calculation step). Since the reference horizontal plane is a plane orthogonal to the gravity direction G, the inclination angle α with respect to the gravity direction G is calculated by executing step S8. Here, FIGS. 7A to 7C are explanatory diagrams showing the inclination angle α between the nodes 1 and 8, and showing the change of the inclination angle α according to the conveyance angle of the vehicle body 10. FIG. As shown in FIG. 1, in the printing process, since the transport angle of the vehicle body 10 changes according to the elapsed time, the direction of gravity G acting on the numerical calculation model 40 of the vehicle body 10 also changes. For this reason, as shown in FIGS. 7A to 7C, the inclination angle α changes according to the change in the transport angle (the direction of action of gravity). Note that the conveyance angle of the vehicle body 10 in the printing process is read as the conveyance angle condition of the calculation condition data in step S1, and in step S8, the inclination angle α is calculated for each elapsed time with reference to the conveyance angle condition. become.

In step S9, the paint outflow amount (paint movement amount) _Vout after a predetermined time is calculated for each node (movement amount calculation step), and in the subsequent step S10, the paint inflow amount (paint movement amount after a predetermined time) for each node. ) V _in is calculated (movement amount calculating step). Here, Fig. 8 (A) is a diagram showing a paint outflow V _out of _the node 1, and FIG. 8 (B) is an explanatory diagram showing a paint inflow V _in node 1. As shown in FIG. 8 (A), the paint flows out from the node 1 to the adjacent nodes 2, 7, 8, 9 located on the lower side of the node 1 in the gravity direction. As shown in B), the paint flows into the node 1 from the adjacent nodes 3 to 6 located above the node 1 in the gravity direction. Such, the flow of the paint, the paint outflow V _out from the node 1 is represented by the following formula (1), paint flow rate V _in respect to the node 1 is represented by the following equation (2).
V _out = ν _{t + 1} (1,2) + ν _{t + 1} (1,7) + ν _{t + 1} (1,8) + ν _{t + 1} (1,9) (1)
V _in = ν _{t + 1} (3,1) + ν _{t + 1} (4,1) + ν _{t + 1} (5,1) + ν _{t + 1} (6,1) (2)

Ν _{t + 1} (1,2) represents the amount of paint movement from node 1 to node 2, ν _{t + 1} (1,7) represents the amount of paint movement from node 1 to node 7, and ν _{t + 1} (1,8) represents The paint movement amount from node 1 to node 8 is shown, and ν _{t + 1} (1, 9) shows the paint movement amount from node 1 to node 9. Also, ν _{t + 1} (3,1) represents the amount of paint movement from node 3 to node 1, ν _{t + 1} (4,1) represents the amount of paint movement from node 4 to node 1, and ν _{t + 1} (5,1) represents The paint movement amount from the node 5 to the node 1 is shown, and ν _{t + 1} (6, 1) shows the paint movement amount from the node 6 to the node 1.

Next, the calculation method of the paint movement amount (paint outflow amount, paint inflow amount) ν _{t + 1} after a predetermined time will be specifically described. As shown in the following formula (3), the paint movement amount ν _{t + 1} after a predetermined time is based on the function Fa (Fb (t)) based on the temperature T and the inclination angle α with respect to the current paint adhesion amount Vt. The calculation is performed by multiplying the function Fc (α) and the function Fd (L) based on the distance L between nodes. That is, as shown in equations (4) and (5), the viscosity of the paint decreases as the temperature T rises, so that the paint movement amount ν _{t + 1} is increased by the function Fa (Fb (t)). Is done. Further, as shown in Expression (6), the steeper inclination angle α is calculated such that the paint movement amount ν _{t + 1} is increased by the function Fc (α). Further, as shown in the equation (7), the paint movement amount ν _{t + 1} is calculated by the function Fd (L) as the inter-node distance L becomes shorter. Such procedure, after calculating the coating amount of movement [nu _{t + 1} between each adjacent node, the formula (1), as shown in (2), adding the coating amount of movement [nu _{t + 1} between a plurality of adjacent nodes by, so that the paint runoff V _out and paint flow rate V _in the aforementioned are determined.
ν _{t + 1} = V _t · Fa (Fb (t)) · Fc (α) · Fd (L) (3)
Fa (T) = a · T ² + b · T + c (4)
Fb (t) = T (t) (5)
Fc (α) = A · sin α + B (6)
Fd (L) = C / L (7)
Here, V _t is a current paint adhesion amount, T is a temperature acting on the vehicle body 10, t is a timer time, α is an inclination angle, and L is a distance between nodes. Further, a to c and A to C are coefficients obtained by experiments.

Subsequently, in step S11, the paint adhesion amount V _{t + 1} after a predetermined time is calculated for each node according to the following equation (8) (adhesion amount calculation step). That is, from the beginning of the coating weight Vt adhering to the node, while subtracting the paint outflow V _out which is calculated in step S9, so that adding the paint flow rate V _in which is calculated in step S10 . Thus, the paint adhesion amount V _{t + 1} at each node after a predetermined time is obtained.
V _{t + 1} = V _t −V _out + V _in (8)

Subsequently, a dripping determination process is executed for each node. Here, FIG. 9 is a flowchart showing a procedure when the dripping determination process is executed. As shown in FIG. 9, in step S20, the node number counter i is reset, and in the subsequent step S21, the paint adhesion amount V _{t + 1 of} the node corresponding to the counter i is read. In subsequent step S22, it is determined whether or not the node to be determined belongs to the lower surface side element in order to determine whether or not the paint is falling. Here, FIG. 10 is a schematic view showing the lower surface side element. As shown in FIG. 10, when a vector V extending vertically from an element has a component in the direction of gravity G, the element is determined as a lower surface side element that may cause the paint to fall.

In step S22, when it is determined that the node to be determined belongs to the lower surface side element, the process proceeds to step S23, and it is determined whether or not the paint adhesion amount V _{t + 1} exceeds the critical fall amount V _c . In step S23, when the coating weight V _{t + 1} is determined to exceed the critical falling amount V _c, the process proceeds to step S24, together with the paint is determined to have fallen, a predetermined amount V _a, except a drop amount stored as coating weight V _t. On the other hand, if it is determined in step S22 that the node to be determined belongs to the upper surface side element, or if it is determined in step S23 that the paint adhesion amount V _{t + 1} is less than the critical fall amount V _c , The applied paint adhesion amount V _{t + 1} is stored as the paint adhesion amount V _t .

  Subsequently, in step S26, the node number counter i is counted, and in the subsequent step S27, it is determined whether or not the counter i exceeds the maximum value N. If it is determined in step S27 that the counter i is less than the maximum value N, the dripping determination process is executed again from step S21. If it is determined that the counter i has reached the maximum value N, the routine is executed. Then, the flowchart of FIG. 3 is executed. The maximum value N determined in step S27 indicates the number of nodes included in the numerical calculation model 40, and the flowchart of FIG. 9 is executed until the dripping determination process for all the nodes is completed.

When such a dripping determination process is completed, the process proceeds to step S13 in the flowchart shown in FIG. 3 and a timer t counting process for measuring the simulation time is performed. In this counting process, the simulation execution interval (for example, 100 seconds) read as the calculation condition data is added to the timer t. Subsequently, in step S14, it is determined whether or not the timer t exceeds an end time (for example, 3600 seconds) Te read as calculation condition data. When it is determined in step S14 that the timer t is less than the end time Te, the paint adhesion amount V _{t + 1 for} each node is calculated again from step S8. On the other hand, if it is determined in step S14 that the timer t has reached the end time Te, the process proceeds to step S15, and the calculation result (time transition of paint adhesion amount, dripping part) is displayed on the display 22 or the like. (Adhesion amount display step). Although the calculation result is displayed on the display 22, the calculation result may be printed by a printer (not shown).

  As described above, since the adjacent nodes are set from the nodes constituting the numerical calculation model 40, the amount of paint movement between these adjacent nodes is calculated based on the temperature T and the inclination angle α. It is possible to predict the occurrence of secondary sagging in. As a result, since the occurrence of secondary sagging can be grasped at the design stage, it is possible to employ a vehicle body structure that takes into account the secondary sagging while suppressing development costs for trial production and the like. In addition, since the occurrence of secondary sagging can be grasped, the specifications of the spray nozzle 14 in the water washing process of the painting line 11 can be appropriately set so as not to generate the secondary sagging, and the manufacturing cost of the vehicle is reduced. It becomes possible.

It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the movement speed of the paint may be calculated from the temperature T and the inclination angle α, and the paint movement amount between adjacent nodes may be calculated based on the movement speed. In the above description, without being affected by the amount of coating weight V _t, but calculates the paint movement value relative to other adjacent nodes, coating weight V _t is a predetermined amount or a predetermined thickness When it falls below, it may be handled that the paint does not move to other adjacent nodes. Furthermore, in the above description, the simulation is executed using the simulation apparatus 20, but the simulation may be executed using a general-purpose computer by causing the general-purpose computer to read the simulation program of the present invention. In the above description, the vehicle body is cited as the object to be coated, but the present invention is not limited to this, and it goes without saying that other parts such as a case may be used.

10 Car body (object to be painted)
15 Oven (heat drying oven)
28 control unit (adjacent node setting means, inclination angle calculating means, movement amount calculating means, adhesion amount calculating means, adhesion amount display means)
40 Numerical calculation model G Gravity direction T Temperature α Inclination angle V _out Paint outflow (paint movement)
V _in paint inflow (paint amount of movement)
V _{t + 1} paint adhesion amount

Claims (6)

A simulation device for predicting dripping of paint adhering to an object,
Based on a numerical calculation model of the object to be divided into a plurality of elements, adjacent node setting means for setting a node adjacent to each node included in the element;
An inclination angle calculating means for calculating an inclination angle between adjacent nodes based on the direction of gravity acting on the object to be coated;
Based on the temperature acting on the object to be coated and the inclination angle between the nodes, a movement amount calculating means for calculating the amount of paint movement between the nodes after a predetermined time;
Based on the paint movement amount, an adhesion amount calculating means for calculating the paint adhesion amount at each node after a predetermined time;
A simulation apparatus comprising: an adhesion amount display means for displaying the paint adhesion amount to the outside. The simulation apparatus according to claim 1,
The simulation apparatus characterized in that the object to be coated is a vehicle body carried into a heating and drying furnace after electrodeposition coating. A simulation method for predicting dripping of paint adhering to an object,
Based on a numerical calculation model of the object to be divided into a plurality of elements, an adjacent node setting step for setting a node adjacent to each node included in the element;
An inclination angle calculating step for calculating an inclination angle between adjacent nodes based on the direction of gravity acting on the object to be coated;
Based on the temperature acting on the object to be coated and the inclination angle between the nodes, a movement amount calculating step for calculating a paint movement amount between the nodes after a predetermined time;
An adhesion amount calculating step for calculating the paint adhesion amount at each node after a predetermined time based on the paint movement amount;
A simulation method comprising: an adhesion amount display step of displaying the adhesion amount of the paint on the outside. The simulation method according to claim 3, wherein
The simulation method according to claim 1, wherein the object to be coated is a vehicle body carried into a heating and drying furnace after electrodeposition coating. A simulation program for predicting dripping of paint adhering to an object,
Based on a numerical calculation model of the object to be divided into a plurality of elements, an adjacent node setting step for setting a node adjacent to each node included in the element;
An inclination angle calculating step for calculating an inclination angle between adjacent nodes based on the direction of gravity acting on the object to be coated;
Based on the temperature acting on the object to be coated and the inclination angle between the nodes, a movement amount calculating step for calculating a paint movement amount between the nodes after a predetermined time;
An adhesion amount calculating step for calculating the paint adhesion amount at each node after a predetermined time based on the paint movement amount;
A simulation program comprising: an adhesion amount display step for displaying the adhesion amount of paint on the outside. The simulation program according to claim 5, wherein
A simulation program characterized in that the object to be coated is a vehicle body carried into a heating and drying furnace after electrodeposition coating.

Images