JP2005199567A - Mold correction system, its device, mold correction method, recording medium, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a proper mold by automatically correcting mold 3DCAD data without spending labor and time. <P>SOLUTION: After the alignment of the molding measurement results 23 in relation to molding 3DCAD data 21 by an alignment part 11, the positional dislocation between them (the quantity and direction of dislocation) is calculated by a positional dislocation calculation part 12. Next, by a measurement result matching part 13, after the molding measurement results 23 and the mold measurement results 24 are compared to obtain the correspondence relationship between them, the mold measurement results 24 are corrected by using the positional dislocation (the quantity and direction of dislocation) by a correction part 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mold correction system / method for correcting a mold created using, for example, CAD or CAM.

Conventionally, when producing a mold, the following procedure is performed.
First, a molded product is designed. First, a designer creates shape data of a molded product using, for example, 3D CAD (Computer Aided Design), and then designs a mold in accordance with the shape of the molded product. When the design of the mold is completed, a numerical control program for machining the mold is created from the 3D CAD data of the mold. The numerical control program is sent to the machine tool, and the die before finishing is machined by the machine tool.

  Next, the mold is corrected. First, a prototype of a molded product is produced using the above-processed / prepared mold. Subsequently, in order to inspect the prototype molded product, the shape of the prototype molded product is measured with a three-dimensional measuring machine or the like, and the measurement result (measurement point group data of the molded product) is used as the 3D CAD data (molded product shape data). ) And drawings to evaluate the validity of the mold.

  As a result of the evaluation, if the prototype is not as designed, the mold is corrected. As a method of correcting the mold, for example, a deviation amount of the measurement point group data of the molded product with respect to the 3D CAD data of the molded product is calculated, and the calculation result is displayed in a form that is visually easy to understand. Then, from this display content, the 3D CAD data of the mold corresponding to the shifted portion is manually corrected according to the rule of thumb of the skilled person. In other words, in order to reflect the calculation result on the mold, it is necessary to perform a manual operation (especially an expert). In addition, in order to obtain a molded product with high accuracy, it is necessary to repeat the above-described mold creation → molded prototype production → prototype molded product measurement → evaluation → mold correction process many times.

In order to solve such a problem, for example, it is conceivable to make and correct a mold by using a technique described in Patent Document 1. That is, when the design of the molded product is completed and the molded product 3DCAD data is completed, the mold is designed and the mold 3DCAD data is completed. At that time, by molding analysis simulation, the molding state excluding the springback amount (plate thickness reduction, wrinkles, etc.) and the springback amount are analyzed. Then, NC data is created based on the mold 3D CAD data and the springback amount. In this method, machining error data is created by analyzing machining errors from NC data, and NC data is created by correcting the NC data based on the machining error data. As is well known, springback is a phenomenon in which when a material is molded with a mold and then removed from the mold, the elastic force of the material causes the material to return to the direction opposite to the bending direction. is there.
JP 2002-126634 A

  However, the method described in Patent Document 1 has a problem that it takes a very long time to input data for creating an optimum mold shape. That is, in order to perform the simulation, it is necessary to create a mesh model used in the analysis software from 3D CAD data created by CAD or the like, which is very laborious. Further, a great amount of time is required for the molding simulation and the die machining simulation. In addition, it is not possible to obtain an optimal mold simply by executing a simulation. After all, it is necessary to correct the mold after creating an actual molded product. Moreover, the rule of thumb of the skilled person may not be necessary, but an expert who has expertise in simulation is required.

In addition, the molding simulation cannot be used for new materials, new injection methods, or completely new molded product shapes for which no know-how database has been accumulated.
Further, in Patent Document 1 described above, the problem of springback with respect to the press mold is a problem. However, in the case of an injection molded product (such as a plastic molded product), shrinkage of the resin becomes a problem. Regardless of whether the problem is springback or resin shrinkage, there is no need for trouble if the shape does not simply conform to the shape of the mold (as per the surface transfer of the mold). It is desired that a highly accurate molded product can be obtained in a short time. Needless to say, the injection molding is a method of obtaining a molded product by injecting and injecting a heat-melted material into a mold, and cooling and solidifying it.

  The problem of the present invention is that it is not necessary to perform manual work correction by skilled workers, etc., and it is not necessary to perform labor-consuming and time-consuming work / processing like simulation, and based on measured data of molded products and molds. It is to provide a mold correction system, an apparatus, a method, a program, and the like that can create an appropriate mold in a short time without trouble and time by automatically correcting the mold.

  The mold correction system of the present invention includes a design means for creating a molded product 3D CAD data and a mold 3D CAD data, a real mold produced using the mold 3D CAD data, and an actual product produced by the mold. A shape measuring means for measuring each shape of the molded article, an alignment means for aligning a measurement result of the molded article obtained by the measuring means with respect to the molded article 3DCAD data, and the measurement result of the molded article A positional deviation calculating means for calculating positional deviation information with respect to the molded product 3DCAD data, an association means for comparing the molded product measurement result and the mold measurement result to obtain mutual correspondence, and an association means Correction means for correcting the mold measurement result using the correspondence and the positional deviation information, and a corrected mold 3D from the mold measurement result corrected by the correction means Configured to have a mold 3DCAD data creating means for creating AD data.

  The mold correction apparatus of the present invention includes a created molded product 3DCAD data, a mold measurement result that is a measurement result of the shape of an actual mold produced using the created mold 3DCAD data, and the actual product. A positioning means for aligning the molded product measurement result with the molded product 3DCAD data based on a molded product measurement result that is a measurement result of a shape of an actual molded product produced by the mold of A misalignment calculating means for calculating misalignment information for the molded product measurement result with respect to the molded product 3DCAD data, an associating means for comparing the molded product measurement result and the mold measurement result to obtain mutual correspondence; Correction means for correcting the mold measurement result using the correspondence obtained by the association means and the positional deviation information, and a corrected mold from the mold measurement result corrected by the correction means Configured to have a mold 3DCAD data creating means for creating DCAD data.

  In the mold correction system and the mold correction apparatus, the molded product 3D CAD data is compared with the molded product measurement result to obtain a deviation (error) from the molded product 3D CAD data caused by springback or shrinkage. By correcting the mold measurement result using the deviation, a corrected mold 3D CAD data can be automatically created. Therefore, it is not necessary to modify manual operations by skilled workers as in the past, and it is not necessary to perform labor-consuming and time-consuming work / processing as in simulation, and it is possible to use an appropriate mold without labor / time. Can be created. In addition, since the mold measurement result is corrected rather than correcting the mold 3D CAD data, the correction result also reflects the machining error of the mold, so that more appropriate mold correction can be performed. This makes it possible to produce a highly accurate molded product without taking time and effort. Further, unlike the simulation, there is no problem even if it is a material (resin etc.) used for injection molding for the first time.

  In the mold correction device, for example, the molded product measurement result is a molded product measurement point group measured at a predetermined interval, the mold measurement result is a mold measurement point group measured at a predetermined interval, The positional deviation calculation means calculates vector information indicating a deviation amount and a deviation direction with respect to the molded article 3DCAD data for each point of the molded article measurement point group, and the association means includes the molded article For each point of the measurement point group, the point of the mold measurement point group corresponding to that point is obtained, and the mold correction means forms each point of the mold measurement point group corresponding to that point. The point of the product measurement point group is moved by the amount of the positional deviation calculated by the positional deviation calculating means, and the mold 3D CAD data creating means is a mold measuring point corrected by the mold correcting means. Connect polygon points to create a polygon model And, creating a NURBS surface based on the polygon model is intended to create a modified version mold 3DCAD data based on the NURBS surface.

  In addition, with the above-mentioned mold correction system / apparatus, it should be noted that there is a high possibility that the first mold will not be an appropriate mold (at least once correction is premised). Since the first mold is manufactured without performing, for example, the mold 3D CAD data can be generated only by transferring the surface from the molded product 3D CAD data, and the labor of the first mold manufacturing process is reduced. it can.

  The present invention is not limited to the above-described mold correction system / apparatus, and a program for causing a computer to execute and implement the mold correction method or the function of the mold correction apparatus, and a recording medium on which the program is recorded. It can also be configured as itself (including a portable recording medium such as a CD-ROM).

  According to the mold correction system, the apparatus, the method, and the program of the present invention, the mold can be automatically corrected based on the actual measurement data of the molded product and the mold. It is not necessary to make corrections, or it is not necessary to perform work / processing which takes time and time as in simulation, and an appropriate mold can be created in a short time without taking time and time. Furthermore, since the mold measurement result is corrected instead of correcting the mold 3D CAD data, the correction result also reflects the machining error of the mold, so that more appropriate mold correction can be performed. And a high-precision molded product can be produced. Further, for example, since the simulation data is not accumulated for a material (resin or the like) used for injection molding for the first time, the injection molding simulation does not work effectively, but such a problem does not occur in the present invention. Furthermore, since dedicated software for performing molding simulation and processing simulation is not required, a low-cost system can be constructed accordingly. Furthermore, even if it is not the expert who has the expertise regarding simulation, the metal mold | die which corrects a metal mold | die and can obtain a highly accurate molded article can be produced.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a functional block diagram of a mold correction system according to this example.
The mold correction system includes a design unit 1, an object shape measurement unit 2, and a mold correction device 10.

The mold correction apparatus 10 includes an alignment unit 11, a positional deviation calculation unit 12, a measurement result association unit 13, a correction unit 14, and a surface creation unit 15.
First, in the design unit 1, a molded product 3D CAD data 21 and a mold 3D CAD data 22 are created by a designer or the like. First, the molded product 3D CAD data 21 is created, and the mold 3D CAD data 22 is created based on this. A real mold is created based on the mold 3DCAD data 22, and a real molded product is created based on the mold.

The object shape measuring unit 2 measures the shapes of the created actual molded product and the mold, and obtains a molded product measurement result 23 and a mold measurement result 24.
The mold correcting device 10 creates the corrected mold 3D CAD data 27 using the molded product 3DCAD data 21, the molded product measurement result 23, and the mold measurement result 24.

  In the mold correction apparatus 10, first, the positioning unit 11 aligns the molded product measurement result 23 with the molded product 3D CAD data 21. That is, alignment is performed such that the distance between the shape of the molded product measurement result 23 and the shape of the molded product 3D CAD data 21 is the closest (if the shape is the same, the position is almost completely overlapped).

  The misalignment calculation unit 12 compares the shape of the molded product measurement result 23 with the shape of the molded product 3D CAD data 21 in the state of being aligned by the positioning unit 11, and the molded product 3D CAD data of the molded product measurement result 23. 21 is calculated. Here, the molded product measurement result 23 is actually composed of a large number of measurement point groups. For each measurement point, a positional deviation with respect to the molded product 3DCAD data 21 is calculated, and this calculated result (positional deviation information 25). ) Is stored.

Similarly, the mold measurement result 24 actually includes a large number of measurement point groups.
The measurement result associating unit 13 compares the molded product measurement result 23 and the mold measurement result 24 (both positions are aligned before that), and obtains measurement points corresponding to each other. For example, for each measurement point of the mold, the measurement point of the molded product at the shortest distance from the measurement point is found.

  The correction unit 14 uses the correspondence obtained by the measurement result comparison unit 13 and the positional deviation information 25 to determine the position obtained for the measurement point of the corresponding molded product for each measurement point of the mold. The corrected measurement result 26 is obtained by moving each measurement point of the mold by the amount of deviation. As a result, the mold is corrected. However, the modified mold 3D CAD data as non-smooth polygon data is created only by this, and therefore the modified mold 3DCAD is smoothed by the surface creation unit 15 (creates a Nurbs surface). Data 27 is created.

The position information (deviation) is vector information indicating a deviation amount and a deviation direction.
FIG. 2 is a diagram showing a specific configuration example of the mold correction system of FIG.
In the following description, an injection-molded product is taken as an example, but in the case of a press-processed product, automatic mold correction can be performed in substantially the same manner.

  In FIG. 2, a computer 30 has a configuration corresponding to the mold correction device 10 and realizes various functions of the alignment unit 11 to the surface creation unit 15 by executing a predetermined application program. In FIG. 2, in the computer 30, the alignment unit 11 to the surface creation unit 15 are not particularly shown, and show data used for processing of these various functional units, data obtained during the processing, and processing result data. Further, the flow of processing is indicated by arrows.

  In FIG. 2, CAD 41 is an example of a tool for designing an injection molded product or a mold, and is a specific example of the design unit 1 in FIG. 1. The designer performs three-dimensional design using the CAD 41, creates the injection molded product 3D CAD data 31, and further creates the mold 3D CAD data 22 based on this. Further, a machining program is created from the mold 3D CAD data 22 using a CAM system (not shown), and this program is transferred to the machining apparatus 51. The processing apparatus 51 processes and creates a real die 52 using the transferred program. The above is a general method for creating the mold 52, and an injection molded product 53 is created using the created mold 52 in a manufacturing apparatus (not shown). In this example, since the mold 3D CAD data 22 is generated without performing an analysis simulation, the mold 3D CAD data 22 need only be transferred by transferring the surface of the injection molded product 3D CAD data 31, as in the conventional case. There is no need to further modify the mold data created by transferring the data to the analysis simulation result.

  In the mold correction system of this example, the mold 3D CAD data is corrected to an appropriate one according to the procedure of the flowchart shown in FIG. The correction to an appropriate one means that the mold is corrected so that a molded product as designed can be obtained by reflecting errors at the time of mold processing and shrinkage of the molded product. Hereinafter, a description will be given with reference to FIGS. 2 and 3.

  First, using the three-dimensional digitizer 54, the shapes of the mold 52 and the injection molded product 53 are measured (steps S1 and S2 in FIG. 3). Here, since the three-dimensional digitizer 54 measures the object to be measured at a predetermined interval, the measurement result is obtained in the form of a measurement point group indicating the shape of the object. Therefore, the mold measurement point group data 34 and the injection molded product measurement point group data 33 shown in FIG. 2 are obtained as measurement results. The three-dimensional digitizer 54 is a specific example of the object shape measuring unit 2 shown in FIG.

  The computer 30 uses the injection molded product 3D CAD data 31, the injection molded product measurement point group data 33, and the mold measurement point group data 34 among the data obtained by the above-described operations, to provide a modified mold 3D CAD. Data 27 is generated. Prior to the processing described below, the computer 30 captures the injection molded product 3D CAD data 31 from the CAD 41 and the mold measurement point group data 34 and the injection molded product measurement point group data 33 from the three-dimensional digitizer 54. Then, each of them is stored in a storage device (for example, a hard disk device) in the computer 30. In FIG. 2, the mold 3D CAD data 22 may appear to be stored in the computer 30, but this is not necessary. In addition, the computer 30 is not limited to a single computer. For example, a plurality of computers 30 may be prepared for each functional unit shown in FIG.

  First, the computer 30 evaluates whether the produced injection molded product 53 is made as designed. This evaluation is to determine whether or not the shape of the injection molded product 3DCAD data 31 and the shape of the injection molded product measurement point group data 33 match. That is, first, by the function of the alignment unit 11 in FIG. 1, the injection molded product measurement is performed so that the deviation of the shape of the injection molded product measurement point group data 33 with respect to the shape of the injection molded product 3DCAD data 31 is minimized. The point cloud data 33 is aligned and the coordinate system of the data is matched (step S3 in FIG. 3). Specifically, for example, first, the user performs rough positioning manually. For example, the shape of the injection molded product 3DCAD data 31 and the shape of the injection molded product measurement point cloud data 33 are displayed on the display of the computer 30, and the user operates the input device (keyboard, mouse, etc.) of the computer 30, By moving / rotating the shape of the injection molding product measurement point cloud data 33 on the display screen, the shape of the injection molding product 3D CAD data 31 is brought to a position that roughly matches the shape. For example, an example is shown in FIG. In the example shown in the drawing, even if the shape of the injection molded product 3DCAD data 31 and the shape of the injection molded product measurement point group data 33 are moved so as to roughly match, the shapes of the two do not match. Various deviations occur at each point.

In FIG. 5A, the mold 3D CAD data 22 is also shown, but this is not particularly relevant.
Subsequently, the computer 30 executes, for example, the process shown in FIG. In FIG. 4, first, after rough positioning is performed manually as described above, at this position, each point of the injection molding product measurement point group data 33 is initially at a minimum distance from that point. The coordinates of the CAD surface of the injection molded product 3DCAD data 31 are obtained (step S11). That is, a perpendicular is drawn from each point to the CAD plane to obtain the coordinates of the intersection.

  Subsequently, for each point of the measurement point group, the distance between the point and the coordinates obtained in step S11 is obtained (step S12), and the obtained distance is squared to calculate the total value of the square values ( Step S13). Then, the current position of the injection molding product measurement point group (first position manually determined by the user) and the calculated total value are stored in association with each other (step S14).

  Next, the whole injection molded product measurement point group is slightly moved (step S15), and the processing of steps S11 to S14 is performed at the moved position to calculate and store the total value. In the process of step S15, for example, the entire injection molded product measurement point group is shifted by a predetermined amount in each direction.

The above process is performed a predetermined number of times set in advance (step S16). That is, the above processing is to obtain the total value while gradually shifting the whole measurement point group of injection molded products around the position manually determined by the user.
Finally, the smallest one of the total values obtained by the above processing is discriminated (step S17), and the whole injection molded product measurement point group is shifted to the position where the smallest total value is obtained (step S18). ) To complete the alignment.

If the minimum total value is smaller than a preset threshold value, it may be determined that the molded product is as designed and the mold is not corrected.
When the above alignment is completed, the computer 30 uses the function of the positional deviation calculation unit 12 in FIG. 1 for each point of the injection molded product measurement point group data 33 to provide a deviation amount (D1) with respect to the injection molded product 3DCAD data 31 and The displacement direction (D2) is calculated (step S4 in FIG. 3). This is shown in FIG.

  FIG. 5 (b) is an enlarged view of the broken-line circle portion of FIG. 5 (a), and the vertical line is drawn from each point of the injection molded product measurement point group data 33 to the CAD surface of the injection molded product 3D CAD data. The perpendicular direction is the displacement direction (D2), and the distance to the CAD surface along the perpendicular direction is the displacement amount (D1) (this displacement amount (D1) itself is the distance obtained in step S12. The difference from the process of S12 is that the direction is also taken into account, that is, a vector indicated by an arrow in the figure is obtained).

  Then, the obtained deviation amount (D1) and deviation direction (D2) are stored in association with each point of the injection molded product measurement point group data 33 (this corresponds to the positional deviation information 25 in FIG. 1). . Further, such ““ injection molded product measurement point group data 33 ”+“ deviation amount (D1) and deviation direction (D2) for each point ”” is the injection molded product measurement point group data (positional deviation) of FIG. Corresponds to 35).

  Once the injection molded product measurement point group data (including the positional deviation information 25) 35 is generated by the processing described above, the measurement result association unit 13 in FIG. 35) (including information 25) and the mold measurement point group data 34 are compared to determine the measurement points corresponding to each other. That is, first, as in step S3, the user manually performs rough alignment between the injection molded product measurement point group data and the mold measurement point group data 34. The injection molded product measurement point group data (including positional deviation information 25) 35 has only a deviation amount (D1) and a deviation direction (D2), and the shape is not corrected by this. In this alignment, the alignment of the injection molded product measurement point group data 33 and the mold measurement point group data 34 is substantially performed.

The mold usually consists of a part that directly contacts the molded product to form the molded product (referred to as a transfer surface) and other parts, but the mold measurement point group data 34 is the transfer surface. This means the measured data of the part.
When the rough alignment in the manual is performed, the computer 30 subsequently executes, for example, the processing shown in FIG. 6 to perform accurate alignment (step S5 in FIG. 3).

  The process of steps S21 to S28 shown in FIG. 6 is substantially the same as the process of steps S11 to S18 of FIG. 4 except for a part thereof, and only the points different from the process of FIG. 4 will be described here. First, the process of step S21 is different from the process of step S11. That is, the processing of FIG. 4 is a comparison between the CAD surface and the measurement point group, but since this processing is a comparison between the measurement point groups, first, the injection molded product measurement point group data 35 is processed as in step S21. For each point, a point of the die measurement point group data 34 closest to that point is searched. In the process of step S25, the entire injection molded product measurement point group is shifted by a predetermined distance in a predetermined direction that is arbitrarily set in advance. Except for these differences, the process is substantially the same as the process of FIG. 4, and finally, the deviation of the injection molded product measurement point group data 35 from the mold measurement point group data 34 is minimized. Position alignment (coordinate system alignment) is performed.

  When the alignment process in step S5 is completed, a process of searching for a point corresponding to each point at the aligned position is performed (step S6 in FIG. 3). That is, for each point of the injection molded product measurement point group data 35, a point of the mold measurement point group data 34 that is the shortest distance from the point is searched. As an example, for each point of the injection molding product measurement point group data 35, a sphere centered on the point is virtually created, and the sphere is gradually expanded. It is assumed that it is the measuring point of the mold in the shortest distance.

As described above, since the deviation amount (D1) and the deviation direction (D2) are held for each point of the injection molded product measurement point group data 35, the mold measurement point group data 34 corresponding to the point is stored. The point is moved in the shift direction (D2) by the shift amount (D1) (step S7 in FIG. 3). FIG. 7 shows an example of such a situation.
In the example shown in FIG. 7, two measurement points of the mold measurement point group data 34 and the injection molded product measurement point group data 35 are shown. Further, in the same figure, the measurement points associated in the process of step S6 are connected by a broken line. An arrow E shown in the figure is a vector indicating the shift amount (D1) and the shift direction (D2).

The corrected mold measurement point group 36 of FIG. 2 is generated by executing the process of step S7 on all the measurement points of the mold measurement point group data 34. The modified mold measurement point group 36 in FIG. 2 is an example of the modified measurement result 26 in FIG.
In the above processing, the mold is temporarily corrected. However, since the shape of the measurement point group remains as it is, it is necessary to make this into the form of 3D CAD data. For this reason, the mold polygon data 37 of FIG. 2 is first created by connecting the points of the corrected mold measurement point group 36 by the surface creation unit 15 of FIG. 1 (step S8 of FIG. 3). 2 is created from the mold polygon data 37 (step S9 in FIG. 3), and the modified mold 3D CAD data 27 in FIG. 2 is regenerated based on the mold naves surface 38. To do. The corrected mold 3D CAD data 27 is an example of the corrected mold 3D CAD data 27 of FIG. In addition, the Nerves surface is generally known as NURBS (Non Uniform Rational B-splines), and can be said to be a data format that can be handled by the CAM. In other words, polygon data is an aggregate of polygons, and even if it is a curved surface, it is represented by a collection of straight lines. It can also be said. Note that the processing in steps S8 and S9 may be realized by, for example, an existing product (for example, Rapidform; manufactured by INUS).

  If there are only a few parts to be re-corrected, the processes in steps S8 and S9 may be performed only for the parts to be re-corrected. That is, only the portion to be recorrected from the corrected mold measurement point group data 36 is created as mold polygon data 37, and a mold nurse surface 38 is created from the mold polygon data 37, and this is used as the original mold 3D CAD data 22. You may make it stick on the coincidence surface.

  By the above-described processing, the corrected mold 3D CAD data 27 is created by the computer 30 functioning as a mold correcting device. Thereafter, as usual, the corrected mold 3D CAD data 27 is transferred to the processing apparatus 51, and the correction mold is processed and created in the processing apparatus 51. Furthermore, a more appropriate (highly accurate molded product can be obtained) mold can be obtained by creating a molded product using the modified mold and performing the above-described processing to further modify the mold. You may make it create.

  As described above, according to the mold correction system of this example, the mold can be corrected based on the actual measurement data of the molded product and the mold, so that it is possible to further reduce the time and effort without requiring a particularly skilled person. Appropriate molds can be created without taking time. In this method, since the mold measurement point group data 34 is corrected instead of the mold 3D CAD data 22, more appropriate mold correction can be performed. That is, since a processing error also occurs in the processing apparatus 51, the manufactured mold often does not match the mold 3D CAD data 22. Thus, by correcting the mold measurement point group data 34 including such processing errors instead of the mold 3D CAD data 22, the correction result also reflects the processing error. Appropriate mold correction can be performed, and a highly accurate molded product can be produced without taking time and effort.

  In addition, in the conventional method described in Patent Document 1, it takes a lot of time and effort to create an analytical model for press molding simulation, press molding simulation, die machining simulation, molding simulation, and the like. On the other hand, in the method of this example, it is not necessary to perform such a time-consuming and time-consuming simulation, and the mold creation / correction can be performed in a shorter time without time-consuming. Further, for example, since the simulation data is not accumulated for a material (resin or the like) used for injection molding for the first time, the injection molding simulation does not work effectively. On the other hand, in the method of this example, since the actual product is suddenly created and measured without performing simulation, and the mold is corrected based on the measured result, even a material (resin etc.) used for the first time can be handled without any problem. . In addition, since dedicated software for performing molding simulation and machining simulation is not required, a low-cost system can be constructed accordingly. Furthermore, even if it is not the expert who has the expertise regarding simulation, the metal mold | die which corrects a metal mold | die and can obtain a highly accurate molded article can be produced.

  Further, in injection molding, a molded product after injection always shrinks and becomes smaller. On the other hand, in the method of this example, since simulation is not performed, the method of correcting the mold always cuts the mold (to enlarge the transfer surface). That is, if the transfer surface is enlarged from the beginning in anticipation of shrinkage by simulation, it is necessary to fill the mold if the transfer surface is too large. The build-up of the mold requires a great amount of correction man-hours. In the method of this example, there is no possibility of this happening (the build-up described here is to give metal to the mold, and it is a modification to dent the over-inflated injection molded product Say).

In this embodiment, the injection molding is targeted, but the same effect can be obtained with substantially the same configuration even when the press molding is targeted.
FIG. 8 is a diagram illustrating an example of a hardware configuration of the computer 30 (mold correction apparatus).

  The computer 30 in the illustrated example includes a CPU 61, a ROM 62, a RAM 63, a storage unit 64, an interface unit 65, an operation input unit 66, a display unit 67, and the like, which are connected to each other via a bus 68. Data can be exchanged with each other under the management of

A CPU (Central Processing Unit) 61 is a central processing unit that controls operation of the entire computer 30.
The ROM 62 is shown in the figure for the time being, but it may not be provided and is not particularly described here.
A RAM (Random Access Memory) 63 stores various application programs stored in the storage unit 64 (particularly, the functions of the various functional units 11 to 15 shown in FIG. 1 and the processing of the flowcharts shown in FIGS. 3, 4, and 6). This is a memory that is used as a work memory when the CPU 61 executes a program for realizing (2), and is also used as a main memory that is used as necessary as a temporary storage area for various data.

  The storage unit 64 is a storage device for storing the various application programs and data, for example, a hard disk device, or portable such as an FD (flexible disk), CD-ROM, CD-R, MO, and DVD-ROM. It is a recording medium. The term “portable” as used herein means that it can be carried independently of the computer 30.

  The interface unit 65 is a communication control unit for transmitting / receiving data to / from some other external device via an arbitrary network, for example. For example, the injection molded product 3D CAD data 31, the injection molded product measurement point group data 33, the mold measurement point group data 34, and the like are fetched from the CAD 41 and the three-dimensional digitizer 54 of FIG. Alternatively, the various application programs may be downloaded from an external information processing apparatus (such as a server) via the interface unit 65.

The operation input unit 66 is, for example, a keyboard, a mouse, or the like, and the user operates these to perform the rough positioning.
The display unit 67 is a display and displays, for example, the injection molded product 3D CAD data 31, the injection molded product measurement point group data 33, the mold measurement point group data 34, and the like when the user performs the rough alignment. .

FIG. 9 shows an example of a recording medium storing the various application programs, a storage device, and a download thereof.
9, the various application programs (in particular, the functions of the various functional units 11 to 15 shown in FIG. 1 and the programs for realizing the processing of the flowcharts shown in FIGS. 3, 4, and 6) are stored in the computer 30. May be stored in the storage device 70 (hard disk device 71, ROM 72, etc.) or may be recorded on a portable recording medium 80 (flexible disk 81, CD-ROM 82, MO83, DVD-ROM 84, etc.). In addition, it may be stored in the storage device 91 in an arbitrary external information processing apparatus (server or the like) 90. Then, for example, the portable recording medium 80 is inserted into the computer 30 and the program recorded on the portable recording medium 80 is read. Alternatively, the program stored in the storage device 91 may be downloaded via an arbitrary network 100 (public line network, Internet, cable television network, some dedicated line, etc.).

It is a functional block diagram of a metal mold correction system. It is a figure which shows the specific structural example of the metal mold | die correction system of FIG. It is a flowchart figure of the whole process performed by the metal mold | die correction apparatus. It is a detailed flowchart figure of the process of step S3 of FIG. (A) is a figure which shows the specific image of the process of step S3 of FIG. 2, (b) is step S4. It is a detailed flowchart figure of the process of step S5 of FIG. It is a figure which shows the specific image of the process of step S7 of FIG. It is a hardware block diagram of a computer. It is a figure which shows the example of the recording medium which recorded the program, and download.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Design part 2 Object shape measurement part 10 Mold correction apparatus 11 Position adjustment part 12 Position shift calculation part 13 Measurement result matching part 14 Correction part 15 Surface creation part 21 Molded article 3D CAD data 22 Mold 3D CAD data 23 Molded article Measurement result 24 Mold measurement result 25 Misalignment information 26 Correction measurement result 27 Modified mold 3D CAD data 30 Computer 31 Injection molded product 3D CAD data 33 Injection molded product measurement point cloud data 34 Mold measurement point cloud data 35 Injection molded product measurement Point cloud data (including misalignment information)
36 Correction mold measurement point group 37 Mold polygon data 38 Mold nurbs surface 41 CAD
51 Processing Device 52 Mold 53 Injection Molded Product 54 3D Digitizer 61 CPU
62 ROM
63 RAM
64 Storage unit 65 Interface unit 66 Operation input unit 67 Display unit 70 Storage device 71 Hard disk device 72 ROM
80 Portable recording medium 81 Flexible disk 82 CD-ROM
83 MO
84 DVD-ROM
90 Any external information processing device (server, etc.)
91 storage device 100 network

Claims (8)

Design means for creating molded product 3D CAD data and mold 3D CAD data;
A real mold produced using the mold 3DCAD data, and a shape measuring means for measuring the shape of each real molded product produced by the mold;
Alignment means for aligning the measurement result of the molded product obtained by the measurement means with respect to the molded product 3DCAD data;
A misregistration calculation means for calculating misregistration information for the molded product 3DCAD data of the molded product measurement result;
An association means for comparing the molded product measurement result and the mold measurement result to obtain a mutual correspondence;
Correction means for correcting the mold measurement result using the correspondence obtained by the association means and the positional deviation information;
Mold 3D CAD data creating means for creating corrected mold 3D CAD data from the mold measurement result corrected by the correcting unit;
A mold correction system characterized by comprising: The created molded product 3DCAD data, the mold measurement result that is the measurement result of the shape of the actual mold produced using the created mold 3DCAD data, and the actual product produced by the actual mold Based on the measurement result of the molded product, which is the measurement result of the shape of the molded product,
Alignment means for aligning the molded product measurement result with the molded product 3DCAD data;
A misregistration calculation means for calculating misregistration information for the molded product 3DCAD data of the molded product measurement result;
Correlation means for comparing the molded product measurement result and the mold measurement result to obtain a mutual correspondence;
Correction means for correcting the mold measurement result using the correspondence obtained by the association means and the positional deviation information;
Mold 3D CAD data creating means for creating corrected mold 3D CAD data from the mold measurement result corrected by the correcting unit;
A mold correction apparatus comprising: The molded product measurement result is a molded product measurement point group measured at a predetermined interval, and the mold measurement result is a mold measurement point group measured at a predetermined interval,
The positional deviation calculation means calculates vector information indicating a deviation amount and a deviation direction from the molded product 3D CAD data for each point of the molded product measurement point group,
The association means obtains a point of the mold measurement point group corresponding to each point of the molded product measurement point group,
The mold correcting means moves each point of the mold measurement point group by the position deviation calculated by the position deviation calculation means with respect to the point of the molded product measurement point group corresponding to the point. ,
The mold 3D CAD data creating unit creates 3D CAD data from each point of the mold measurement point group corrected by the mold correcting unit, creates a surface based on the 3D CAD data, and modifies based on the surface. 3. The mold correcting apparatus according to claim 2, wherein the mold mold 3DCAD data is created. The molded product measurement result is a molded product measurement point group measured at a predetermined interval, and the mold measurement result is a mold measurement point group measured at a predetermined interval,
The positional deviation calculation means calculates vector information indicating a deviation amount and a deviation direction from the molded product 3D CAD data for each point of the molded product measurement point group,
The association means obtains a point of the mold measurement point group corresponding to each point of the molded product measurement point group,
The mold correcting means moves each point of the mold measurement point group by the position deviation calculated by the position deviation calculation means with respect to the point of the molded product measurement point group corresponding to the point. ,
The mold 3D CAD data creation means creates a polygon model by connecting each point of the mold measurement point group corrected by the mold correction means, creates a Nervous surface based on the polygon model, and 3. The mold correction apparatus according to claim 2, wherein the corrected mold 3D CAD data is created based on the data.   The mold correction apparatus according to claim 2, wherein the mold 3DCAD data is created by transferring a surface from the molded product 3DCAD data. The created molded product 3DCAD data, the mold measurement result that is the measurement result of the shape of the actual mold produced using the created mold 3DCAD data, and the actual product produced by the actual mold Based on the measurement result of the molded product, which is the measurement result of the shape of the molded product,
Align the measurement result of the molded product with the molded product 3DCAD data,
Calculate positional deviation information for the molded product 3D CAD data of the molded product measurement result,
Compare the molded product measurement result and the mold measurement result to obtain the corresponding relationship,
The mold measurement result is corrected using the obtained correspondence and the positional deviation information,
A mold correction method comprising: generating a corrected mold 3D CAD data from the corrected mold measurement result. On the computer,
The created molded product 3DCAD data, the mold measurement result that is the measurement result of the shape of the actual mold produced using the created mold 3DCAD data, and the actual product produced by the actual mold Based on the measurement result of the molded product, which is the measurement result of the shape of the molded product,
A function of aligning the molded product measurement result with the molded product 3DCAD data;
A function of calculating positional deviation information with respect to the molded product 3DCAD data of the molded product measurement result;
A function for comparing the molded product measurement result and the mold measurement result to obtain a mutual correspondence;
A function of correcting the mold measurement result using the obtained correspondence and the positional deviation information;
A function of creating corrected mold 3D CAD data from the corrected mold measurement result;
The computer-readable recording medium which recorded the program which implement | achieves. On the computer,
The created molded product 3DCAD data, the mold measurement result that is the measurement result of the shape of the actual mold produced using the created mold 3DCAD data, and the actual product produced by the actual mold Based on the measurement result of the molded product, which is the measurement result of the shape of the molded product,
A function of aligning the molded product measurement result with the molded product 3DCAD data;
A function of calculating positional deviation information with respect to the molded product 3DCAD data of the molded product measurement result;
A function for comparing the molded product measurement result and the mold measurement result to obtain a mutual correspondence;
A function of correcting the mold measurement result using the obtained correspondence and the positional deviation information;
A function of creating corrected mold 3D CAD data from the corrected mold measurement result;
A program to realize

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