JP3442172B2 - Evaluation method of analysis results for injection molding - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for performing an analysis for injection molding based on graphic information represented by CAD data, and more particularly, to an apparatus for analyzing a rib, a gate, and the like. Characteristics such as flow front, etc. in the analysis for injection molding, flow rate, temperature,
Created by associating the type of physical quantity, which is the analysis result of the characteristic part, such as pressure, with the description information indicating the method of extracting the physical quantity obtained at the characteristic part, such as the average value, the maximum value, the minimum value, etc. The present invention relates to a method for evaluating an analysis result for injection molding in which an evaluation index is created and stored in advance, and an analysis result is evaluated using a required evaluation index from the stored evaluation indexes. 2. Description of the Related Art As a method of evaluating an analysis result in an analysis for injection molding, a constant velocity diagram of a flow front is created based on a position of the flow front obtained at each time.
By displaying this, there is a method that makes it possible to easily grasp the occurrence position of the short shot. In the method disclosed in Japanese Patent Application Laid-Open No. 1-141018, the progress of filling is represented as an isochronous diagram. Then, a change in the filling speed along a path determined by a predetermined method in the isochronous diagram is calculated, and an optimum filling speed is obtained based on the calculated change in the speed . In another method, filling is performed using a finite element method by using molding data such as an injection flow rate, an injection resin temperature, a mold temperature, and an injection pressure, and data such as a runner diameter and a sprue diameter as initial conditions. The analysis is performed, and from the obtained analysis result, an index value that causes burn is obtained using a predetermined formula.
Thereafter, based on the results of the initial analysis, the suitability index values are sequentially calculated in the order from the injection molding machine to the mold. Then, the suitability index value is graphed and displayed. [0005] However, in the above-mentioned prior art, since the evaluation index linking the analysis result and the actual product quality has not been established, the following problems have occurred. [0006] That is, how to evaluate the physical quantity obtained from the analysis result differs depending on the type of occurrence of a defect in injection molding. Therefore, even when using the above-described conventional technology, it is necessary to understand the correlation between the product quality and the analysis result in actual injection molding in order to evaluate various analysis results. Therefore, the evaluation of the analysis result depends on the experience and intuition of the operator, so that the evaluation result has individual differences. Also, when deploying evaluation results to actual design, there are many parts that are trial and error approaches,
We could not guarantee that we would give the right instructions at the right time. [0007] The present invention was been made to solve the above problems, an object of the present invention, a method of extracting a characteristic portion in the injection molding, the analysis results and the type of the physical quantity is, the obtained physical quantity previously created and stored metrics associated with each other and adjective information indicating, in correspondence with the evaluation items
Established metrics and input for each
By evaluating the analysis results based on the
Another object of the present invention is to provide a method of evaluating an analysis result for injection molding, which can automatically obtain an evaluation result independent of individual differences . [0008] In order to solve the above problems,
The method for evaluating the analysis result for injection molding according to the present invention is based on CAD.
In a device that performs an analysis for injection molding based on graphic information represented by data, a characteristic portion in the analysis for injection molding, such as a rib, a gate, a flow front, and a flow rate,
Shows the type of physical quantity, such as temperature and pressure, which is the analysis result of the injection molding analysis at the characteristic part, and the method of extracting the physical quantity obtained at the characteristic part, such as an average value, a maximum value, and a minimum value. The mutual relationship with the adjective information,
Stored in the evaluation index database as an evaluation index, the Review
For each of the value indexes,
The value is associated with the evaluation index and the evaluation index database
When evaluating the analysis results,
The evaluation index read from the evaluation index database;
The quality of the analysis result is determined based on the reference value.
The method is to be. The operation of the present invention will be described below. The evaluation indices include characteristic parts in the analysis for injection molding, such as ribs, gates, flow fronts, etc .;
The correspondence between the type of physical quantity, which is the analysis result of the characteristic part, such as temperature and pressure, and the description information indicating the method of extracting the physical quantity obtained at the characteristic part, such as the average value, maximum value, and minimum value, are shown. It is the data shown. [0011] Therefore, for example, in the evaluation index of the filling pressure of the resin, the kind and the epithet information characteristic portions physical quantity, it becomes the gate, pressure, and rate of change. In the evaluation index indicating the flow front progress speed, the characteristic part, the type of physical quantity, and the description information are a flow front, a speed, and a change rate. That is, the evaluation index is data indicating a relationship established between the characteristic part, the type of physical quantity, and the description information in correspondence with the item to be evaluated. [0012] Therefore, in case of reading metrics that require the evaluation index database would metrics relationship has been established in the three parties are read out. as a result,
The evaluation of the analysis result is evaluated using an evaluation index that establishes a relationship between the three. The evaluation index and the reference value read from the evaluation index database are evaluation indexes and reference values established corresponding to the evaluation items, and are data independent of individual differences. For this reason, the quality of the analysis result is evaluated based on the evaluation index and the reference value that do not depend on individual differences. [0014] [Example] Hereinafter, with reference to the accompanying drawings, an embodiment of the present invention. FIG . 5 is a block diagram showing an electrical configuration of an apparatus to which the method for evaluating an analysis result for injection molding according to the present invention is applied. The analysis for injection molding is performed based on graphic information represented by CAD data. It is a device to perform. In FIG . 1, a graphic creating unit 1 is a CAD system, and corresponds to graphic information of a solid model indicating a product shape as shown in FIG. 6 and a solid model as shown in FIG. Create figure information for a mesh model that is a model for analysis. In addition, graphic information of various models required for injection molding, such as a cooling path, is created. Then, the created graphic information is stored in the graphic database 7. The object management unit 8 is a block for managing the graphic information of various models created by the graphic creating unit 1 as objects. Object data, which is data for indicating a mutual relationship, is created using a cross-sectional relationship. Then, the created object data is stored in the object database 11. The evaluation index creating unit 10 stores the characteristic part in the analysis for injection molding, the type of physical quantity which is the analysis result of the analysis for injection molding in the characteristic part, and the description information indicating the method of extracting the physical quantity obtained in the characteristic part. Is a block for creating a correspondence between the two as an evaluation index.
Then, the created evaluation index is sent to the evaluation index storage unit 9. [0019] Note that the characteristic portions of an injection molding analysis, in particular, as indicated by reference numeral 21 in FIG. 1, the entire area, the flow front, ribs, nozzle, gate, information indicating that such node number (In FIG. 8, the flow front is 41, the rib is 42, the nozzle is 43, and the gate is 4
4 and the weld is indicated by 45). The type of physical quantity is information indicating a flow rate, a temperature, a pressure, a flow velocity, a viscosity, and the like, as indicated by reference numeral 23 in FIG. In addition, the description information indicating the method of extracting the physical quantity is information indicating an average value, a maximum value, a minimum value, a change rate, a last value, and the like, as indicated by reference numeral 22 in FIG. . The evaluation index storage unit 9 includes an evaluation index creation unit 10
It is a block for controlling the input and output of the evaluation index created in the above. The evaluation index sent from the evaluation index creation unit 10 is stored in the evaluation index database 12. Further, it reads out the evaluation indices stored in the evaluation index database 12 and sends out the read out evaluation indices to the evaluation index selecting unit 2 and the evaluation executing unit 5. The evaluation index selection unit 2 is connected to an evaluation index database 12 via an evaluation index storage unit 9 connected in two directions.
Is a block for reading an evaluation index required for evaluation from among the plurality of evaluation indexes stored in.
Specifically, the evaluation index storage unit 9 is notified of the evaluation index to be read out. Further, an analysis program corresponding to the evaluation index is selected, and the type of the selected program is notified to the analysis execution unit 4. The analysis software group 3 is a group of programs necessary for the analysis for injection molding, and is composed of three types of programs, specifically, a flow analysis program, a cooling analysis program, and a deformation analysis program. . The analysis execution unit 4 analyzes the graphic information created by the graphic creation unit 1 and selects the evaluation index selection unit 2
Is a block for executing the analysis for injection molding by using the program instructed by. Then, the analysis result is sent to the evaluation execution unit 5. The evaluation execution unit 5 is a block for evaluating the analysis result in accordance with the evaluation index read by the evaluation index selection unit 2. The evaluation execution unit 5 sends the evaluation result to the evaluation result display unit 6 and displays it. Let it. [0025] Hereinafter, an embodiment of the present invention in detail. In order to create an evaluation index for each item to be evaluated, the evaluation index creating unit 10 selects a required characteristic part from a list 21 of characteristic part names based on knowledge obtained from abundant experience. I do. Also, the corresponding information is selected from the list 22 of the description information. List of physical quantities 2
Select the corresponding physical quantity from 3. [0027] For example, in the case of creating an evaluation index for the evaluation of the ribs short, the characteristic site ribs, maximum epithet information, the type of physical quantity corresponding relation of temperature is selected. When the characteristic part is a rib and the shape information passes, a correspondence relationship in which the type of the physical quantity is speed is selected. In each correspondence, coefficients C1 and C2 for the obtained values are set, and a calculation formula is determined. Further, a reference value C3 serving as a reference for evaluation is determined. In addition, instructions for a program (flow analysis) to be used for evaluation are given. A comment is created as needed (see FIG. 1). [0028] The creation of the metrics described above is repeated for each item to be evaluated. The created evaluation index is stored in the evaluation index database 1 via the evaluation index storage unit 9.
2 is stored. FIG. 2 shows a list of evaluation indices stored in the evaluation index database 12 as a result of the above-described creation operation. In this list, the correspondence between the characteristic part, the shape information, and the physical quantity is shown in the column of the calculation formula. As is clear from the above description, the correspondences determined based on knowledge based on abundant experience are stored in the evaluation index database 12 , so that these correspondences are obtained by analyzing the analysis results and the product. so that the accurate relationship is established on the correlation between the quality. [0030] When performing the analysis for injection molding based on graphic information created, by using the evaluation index selecting section 2, the evaluation index stored in the metric database 12, an evaluation index required for evaluation of the analysis results select.
At this time, as shown in FIG.
Since the evaluation indices stored in the evaluation index database 12 are sequentially displayed, a required evaluation index is selected by referring to the display of the area 31. The selected evaluation index is displayed in the area 32. The figure shows a case where six evaluation indices are selected. For this reason, the evaluation index shown in the area 32 is an index with which the correlation between the product quality and the analysis result accurately corresponds to the item to be evaluated regardless of the actual experience of the operator. If necessary, a value for weighting at the time of evaluation is input for automatic optimization. When the type of the analysis program to be used at this time is selected, the type of the selected program is instructed from the evaluation index selection unit 2 to the analysis execution unit 4. The analysis executing unit 4 executes an injection molding analysis based on the designated analysis program on the graphic information created by the graphic creating unit 1, and sends the analysis result to the evaluation executing unit 5. The evaluation executing unit 5 calculates a designated value for each of the evaluation indices selected by the evaluation index selecting unit 2. Then, it is determined whether or not the calculated value satisfies the reference value, and the result of the determination is displayed in the determination column. Therefore, in the evaluation result display section 6, as shown in FIG. 4, the value obtained based on each of the evaluation indices and the determination result are displayed. FIG. 7 shows that the flow rate does not satisfy the reference value. [0033] This indicates that may be carried out to change the order to increase the flow rate. The result of this determination is
Since the correlation between the analysis result and the actual product quality uses an extremely accurate evaluation index, the judgment result has high accuracy. The method for evaluating the results of analysis for injection molding according to the present invention is applied to an apparatus for performing analysis for injection molding based on graphic information represented by CAD data. And
Features such as ribs, gates, and free fronts, and characteristic types in the analysis for injection molding, and types of physical quantities which are analysis results of the analysis for injection molding in the characteristic portions such as flow rate, temperature, pressure,
The mutual relationship between the average value, the maximum value, the minimum value, and the like and the adjective information indicating the extraction method of the physical quantity obtained in the characteristic part is stored in the evaluation index database as an evaluation index, and the evaluation is performed.
For each of the value indices,
Stored in the evaluation index database in association with the evaluation index
When evaluating the analysis results, use the evaluation index database.
Based on the evaluation index and the reference value read from the source,
It is a method of determining the quality of the analysis result. For this reason,
Judgment of the quality of analysis results is based on an evaluation index that does not depend on individual differences.
Because the evaluation is based on the reference value, it does not depend on individual differences.
Automatic evaluation results can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing a screen display used for creating an evaluation index. FIG. 2 is an explanatory diagram showing a list of evaluation indices stored in an evaluation index database. FIG. 3 is an explanatory diagram showing a screen display when an evaluation index is selected. FIG. 4 is an explanatory diagram showing a screen display of a determination result when an analysis for injection molding is performed. FIG. 5 is a block diagram showing an electrical configuration of an injection molding analysis apparatus to which an embodiment of the present invention is applied. FIG. 6 is an explanatory diagram showing a solid model of a product. FIG. 7 is an explanatory diagram showing a mesh model of a product. FIG. 8 is an explanatory diagram showing characteristic portions in a solid model of a product. [Description of Signs] 21 Characteristic part 22 Description information 23 Type of physical quantity 41 Flow front 42 Rib 43 Nozzle 44 Gate 45 Weld

Claims (1)

(1) In an apparatus for performing an analysis for injection molding based on graphic information represented by CAD data, a characteristic portion in the analysis for injection molding, such as a rib, a gate, and a flow front. And the flow rate, temperature, pressure, etc., the type of physical quantity that is the analysis result of the injection molding analysis at the characteristic part, and the average value, maximum value, minimum value, etc., of the physical quantity obtained at the characteristic part The corresponding relationship with the adjective information indicating the extraction method is stored in the evaluation index database as an evaluation index, and for each of the evaluation indexes , the evaluation is performed.
A reference value serving as a reference for the value is associated with the evaluation index,
Store in the evaluation index database, and evaluate the analysis result
When performing, read from the evaluation index database
The analysis based on the obtained evaluation index and the reference value.
A method of evaluating an analysis result for injection molding , wherein the quality of the result is determined .