JP4721135B2 - Method for determining manufacturing conditions for high-precision coating jigs for coated plastic molded parts - Google Patents

Description

  The present invention relates to a method for improving the accuracy of painting of a resin molded part, and more particularly to a method for determining the production conditions of a coating jig for coating the outer surface of a resin molded part to be coated.

  Conventionally, with respect to a resin-molded part to be coated, which is coated on the outer surface of, for example, an automobile bumper, a so-called workpiece, which is the resin-molded part molded by injection molding, is placed on a coating jig. The surface is painted to form a finished surface.

  The painting process during the conventional vehicle development schedule is based on the result of thermal deformation analysis of the workpiece due to heating during painting using the CAE (Computer-Aided Engineering) method after the drawing of the bumper etc. is completed. It consists of a process of drawing a production drawing of a painting jig for painting.

Of these conventional vehicle development schedules, in the production process of the painting jig, the jig used to place the workpiece when painting on the workpiece such as a bumper is basically in accordance with the shape of the workpiece. Produced. However, if the outer shape of the coating jig is formed so as to be completely along the inner side of the workpiece to be in contact, the workpiece and the coating jig are brought into close contact with each other due to heating of the workpiece during coating, making it difficult to remove. For this reason, the shape of the end of the contact surface with the workpiece in the painting jig is deformed so as to be gradually separated from the workpiece by using the experience and intuition of the craftsman or a partial CAE, that is, gradually changed. Thus, the detachability of the workpiece from the coating jig has been improved. An example of the conventional deformation analysis method for resin molded parts is disclosed in Patent Document 1 by the present inventors.
JP 2007-71674 A

  On the other hand, in the painting of this workpiece, if the accuracy of the gradual change around the abutting portion with respect to the workpiece at the end of the coating jig is low, that is, suddenly deformed, it is placed on the painting jig in the painting process. The heated workpiece is thermally deformed by its own weight and heating, and the outer surface of the workpiece, for example, the end 14b of the bumper 14 shown in FIG. 6 is distorted and deformed, the surface accuracy of the workpiece is deteriorated, and the quality of the coated resin molded part is improved. There was a problem of lowering.

  As is clear from this, the quality of this type of resin molded part depends greatly on the quality of the gradual change of the coating jig, and the design drawing and production stage of the coating jig, or the coating jig by them. However, it was difficult to improve the stability of the quality because the gradual change work was performed based on the experience and intuition of craftsmen.

  In addition, even if a coated resin molded part with a certain level of surface accuracy is obtained, the coated resin molded part must be attached when the painted resin molded part is assembled to the assembly target due to distortion deformation that occurs during painting. In many cases, it cannot be assembled unless it is deformed by stress, which causes an excessive burden on the assembly work.

  Furthermore, in the conventional painting jig manufacturing process, it is not possible to create a design drawing for creating the painting jig unless the final design drawing of the workpiece is completed. The process of creating a painting jig for painting alone required a period of several months.

  The present invention was created in view of the above problems, and by improving the surface accuracy of the coated surface of the coated resin molded part and improving the quality stability, it also improves the shape accuracy of the finished product. Resin-molded resin parts that can reduce the assembly stress of the painted resin-molded parts to be assembled, reduce the assembly work load, and greatly reduce the time required for production review It is an object of the present invention to provide a method for determining the manufacturing conditions of a coating jig for increasing the accuracy of the coating surface in the process.

In order to achieve the above object, a method for determining the production conditions of a coating jig for increasing the precision of a coated surface in a resin-molded part to be coated according to the present invention produces a resin-molded part which is a coating object molded by injection molding. final step performs forming analysis using the CAE with respect to the design shape model to the final design shape model pursuant to, resin molding of the coating jig to be used for painting the tree fat molded part based on the result for the first step and the heat from the optimization to painting jigs elastic constant of the shock absorber by using the C AE for supporting the resin molded component via the elastic body during coating to calculate an optimum shape model against the component The second stage of calculating the optimal elastic constant model that facilitates the removal of deformed resin molded parts, and the surface distortion of the resin molded parts due to the heat during painting are regarded as minute displacements, and the displacement is controlled from the normal direction of the surface. And a response surface methodology CAE by varying the value of the gradual deformation like R combined following items (A1) and (A2) was used to enter within value, calculate Xu deformation shape of an optimal solution in the coating wearing jig And a third stage.
(A1) Resin plate thickness t of the resin molded part.
(A2) The contact area s between the resin molded part and the painting jig.

  According to the present invention, the optimum conditions for the production of the painting jig are the first stage for calculating the optimum shape model of the painting jig and the second stage for calculating the optimum elastic constant model using CAE, respectively. It can be divided into three steps, the third step to calculate the optimal solution of the gradual deformation in the coating jig, and the study of the manufacturing conditions of the coating jig can be started at the drawing creation stage for the resin molded part to be coated By deriving the optimum conditions for each part at each stage, it is possible to obtain a stable coated surface of the work without relying on an experienced craftsman, and after finishing the painting work The workpiece can be easily detached from the painting jig, and the painting jig can be manufactured in a period shorter than the conventional one.

  Further, by improving the shape accuracy of the finished product of the workpiece, it is possible to reduce the assembly stress with respect to the workpiece assembly target, thereby reducing the assembly work load.

  In addition, since CAE is used for the most part of the determination of the production conditions for painting jigs, various information relating to this can be converted into data, and a database relating to the production of painting jigs can be easily constructed. .

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The method 1 for determining the production conditions of the coating jig for increasing the precision of the coating surface in the resin molded part to be coated according to this embodiment is a coating jig 10 for improving the coating surface accuracy of the coating applied to the outer surface of the resin molded part. It is related with the method of determining the production conditions. In the present embodiment, a bumper for a passenger car will be described as an example of a workpiece that is a resin molded part to be painted.

  As shown in FIG. 3, a painting jig 10 produced by the method 1 for determining the production conditions of a painting jig according to the present embodiment includes a support column 11a erected vertically to the floor of the coating chamber, and a support column 11a. And a horizontal frame 11b extending in the horizontal direction fixed to the upper end of the frame.

  The coating jig 10 includes a horizontal shock absorber 13a that supports the bump power 14 in the width direction via an elastic body, and extends horizontally outward from the upper end of the coating jig main body 13, and a bumper. A vertical shock absorber 13b extending substantially upward in the vertical direction is provided at the upper end of the coating jig 10 for supporting the work 14 in the vertical direction via an elastic body.

  At the outer ends of the horizontal shock absorber 13a and the vertical shock absorber 13b, jig abutting portions 12a and 12b that abut the inner surface of the van power sk 14 and support the bang power quake 14 are attached. It is configured so that it can be detachably mounted and supported.

  In addition, the main part of the said painting jig 10 comprised as mentioned above is determined and manufactured to the optimal conditions by the manufacturing method determination method 1 of the painting jig of this embodiment, The determination method will be described below.

  As shown in FIG. 1, the method 1 for determining the manufacturing conditions of the present painting jig includes a first stage S1 for calculating an optimum shape model of the jig abutting portions 12a and 12b of the painting jig 10, a shock absorber 13a, The second step S2 for calculating the optimum elastic constant model 13b and the third step S3 for calculating the optimum solution of the gradual deformation at the jig contact portions 12a and 12b are constituted by three steps.

  In the first stage S1, during the entire process, in the design drawing creation process for manufacturing the van power quark 14 to be painted, a molding analysis is performed on the design shape model using CAE, and based on this result. The shape of the jig abutting portions 12a and 12b, which are the abutting portions of the coating jig 10 used for painting the van power sk 14 with respect to the inner surface of the van power sk 14, is optimized. Ten optimal shape models are calculated.

  The second step S2 is a step for optimizing the elastic constants of the shock absorbers 13a and 13b that incorporate the elastic body, for example, a spring (not shown) and support the bump power 14 and uses CAE. In this step, an optimum elastic constant model is calculated, and the van power quark 14 can be easily removed from the coating jig 10.

In the third step S3, the surface distortion of the van power quark 14 is regarded as a minute displacement, and the numerical value of the edge gradually deformed state R is changed so that the displacement falls within a specified value from the normal direction of the surface. As shown in FIG. 2, it is analyzed three-dimensionally using the response surface method in combination with the resin plate thickness t and the contact area s between the van power quark 14 and the jig contact portions 12a and 12b, and the optimum shape is obtained. This is a step of deriving an optimal solution within the range and reflecting it in the drawing data of the operation of the painting jig 10. Based on the drawing data created in this way, the coating jig 10 is produced through a laser processing step or the like.

  As a result, in the conventional method, the design drawing of the painting jig 10 capable of producing a highly accurate coating surface, which could not be created unless it was based on the final design drawing for producing the van power 14, is a work piece. It is now possible to create a design drawing before creating a drawing for the painting jig.

  FIG. 3 shows the configuration of the painting jig 10 produced based on the workpiece design drawing which is the final design drawing for producing the painting jig 10 produced as described above. FIG. 4 is an enlarged view of the periphery of the jig contact portion 15a that is a contact portion with the inner surface of the corner portion of the van power quark 14 on the painting jig 10 in FIG. FIG. 5 shows an enlarged cross-sectional view of the periphery of the jig contact portion 15c which is a contact portion with the inner side surface of the central portion in the longitudinal direction.

  It is the first stage S1 and the third stage S3 in the present embodiment that optimize the shape of the portion shown in FIGS. 4 and 5, thereby creating a highly accurate coating surface. Can do. In addition, the second stage S2 provides a good elasticity and ensures high surface accuracy, but conventionally, the van powerk and the painting jig are in close contact with each other due to thermal deformation of the coating, making it difficult to remove. It is possible to eliminate such problems and easily leave.

  As described above, the method 1 for determining the manufacturing conditions of the coating jig for improving the accuracy of the coating surface in the bump power of the present invention is to set the condition of each major part of the configuration of the coating jig 10 as follows. Calculated by using CAE step by step at a predetermined time before the final design for work 14 production is finished, while shortening the overall production time, and more precise coating surface The manufacturing conditions of the coating jig are determined so as to be obtained, and can be implemented in various forms without departing from the gist thereof.

It is a flowchart which shows the determination method of the production conditions of the jig for a coating for the high precision of the coating surface in the van powerque which is a to-be-coated resin part of this invention. 3 is a three-dimensional graph showing an optimum shape range derived by a response surface method in a third stage in FIG. 1. It is sectional drawing which shows the state which has mounted the van powerque which is a coating object on the jig for coating produced by applying the method of this invention. It is an enlarged view of the periphery of the jig contact part which is a contact part with the inner surface of the corner part of the van powerk of the coating jig in FIG. It is an expanded sectional view of the periphery of the jig contact part which is a contact part with the inner surface of the center part in the longitudinal direction of the van powerk of the coating jig in FIG. It is a perspective view which shows a bump power.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Method for deciding production condition of painting jig for painting van power quake 10 painting jig 11a support 11b horizontal frame 12a jig abutting portion 12b jig abutting portion 13a horizontal shock absorber 13b vertical shock absorber 14 van power quake S1 first Stage S2 Second stage S3 Third stage

Claims (1)

Based on the results of molding analysis using CAE for the design shape model or the final design shape model according to the final stage for producing the resin molded part that is the object of painting molded by injection molding . a first step of calculating an optimum shape model against to the resin molded parts of the coating jig to be used for painting the tree butter molded part,
Optimum elastic constant for facilitating the removal of the resin molded part thermally deformed during painting from the coating jig by optimizing the elastic constant of the shock absorber supporting the resin molded part via an elastic body using CAE A second stage of calculating the model,
The following distortions (A1) and (A2) are obtained by CAE using the response surface method so that the surface distortion of the resin molded part due to heat during coating is regarded as a minute displacement and the displacement falls within a specified value from the normal direction of the surface. ) and by varying the value of Xu deformed shape R combined, a third step of calculating a gradual deformation shape of an optimal solution in the coating jig,
A method for determining the manufacturing conditions of a coating jig for increasing the precision of a coated surface of a resin-molded part to be coated, characterized by comprising:
(A1) Resin plate thickness t of the resin molded part.
(A2) The contact area s between the resin molded part and the coating jig.