JP6735367B2 - Mold correction method - Google Patents

Description

The present invention relates to a method for modifying a mold for molding a product.

In Japanese Unexamined Patent Application Publication No. 2008-287468, a product is trial-molded using a molding die, and three-dimensional coordinate values at representative points of the trial-molded product are represented by relative coordinates with reference to the design value of each representative point. What displays a graph is disclosed.

When the information of a large number of places on a product is displayed in a graph as in the technique of Japanese Patent Laid-Open No. 2008-287468, there is a problem that it is difficult for a worker to grasp the quality of the product at a glance.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for correcting a molding die that allows an operator to grasp the quality of a product at a glance.

The method for correcting a molding die of the present invention, a design product model having a product three-dimensional shape and information of design values, a product design step of designing on a product coordinate system which is a preset three-dimensional coordinate system, Based on the design product model, a molding die creating step of forming a molding die for molding the product, a trial molding step of trial-molding a product using the molding die, and a plurality of measurement points on the trial-molded product Position, the measurement step of measuring on a measurement coordinate system that is a preset three-dimensional coordinate system, the measurement value of the measurement point measured in the measurement step, and on the design product model corresponding to the measurement point Deviation information calculating step of calculating the magnitude of deviation from the design value of the point, a drawing showing the shape of the product of the designed product model, and a display step of displaying the deviation magnitude on a display unit, A reference adjustment step for adjusting the position of the product coordinate system so that the magnitude of the deviation at the measurement point becomes smaller, and a deviation information re-calculation for calculating the deviation magnitude with respect to the design value in the adjusted product coordinate system. There is a calculation step and a molding die correction step of correcting the molding die so that the position of the product coordinate system on the product becomes the position of the product coordinate system after the adjustment in the reference adjustment step.
Further, in the reference adjusting step, the product coordinate system is adjusted so that the sum of the magnitudes of the deviations at the measurement points becomes small.
Furthermore, in the reference adjustment step, a partial best fit for calculating the movement amount of the product coordinate system so that the sum of the magnitudes of the deviations at the selected measurement points becomes small, and the deviations at all the measurement points. A total best fit for calculating the amount of movement of the product coordinate system so that the sum of the magnitudes of , An intermediate value between the movement amount by the partial best fit and the movement amount by the whole best fit, and within a range sandwiched between the movement amount by the partial best fit and the movement amount by the whole best fit, A plurality of values obtained by changing the weights of the respective movement amounts are calculated at the same time, and the worker selects one calculation result from the calculation result group in consideration of the correction method of the molding die. The product coordinate system is adjusted based on the calculated value.

Therefore, since the size of the deviation is displayed on the drawing of the product, the worker can grasp the size of the deviation at a glance, and the work amount of the worker can be reduced by adjusting the product coordinate system. it can. Further, since the molding die is corrected based on the size of the deviation after the position of the product coordinate system is adjusted, the correction of the molding die can be reduced.
Furthermore, the product coordinate system can be automatically adjusted, and the work amount of the worker can be reduced.
Furthermore, it is possible to easily correct the molding die by selecting to perform the partial best fit on the measurement points of the portion where the molding die is difficult to correct or the portion where the correction takes a lot of time. In addition, depending on the accuracy required for the part of the measurement point selected to perform the partial best fit, the sum of the deviations at the measurement points by the partial best fit and the deviation at the measurement points by the overall best fit. The weight of the sum of can be set.

In the reference adjusting step, the worker inputs the parallel movement amount of the product coordinate system and the rotation movement amount around each coordinate axis to adjust the movement amount of the product coordinate system. Therefore, the amount of movement of the product coordinate system can be input in a format that is easy for the worker to intuitively understand.

Further, in the reference adjustment step, the operator adjusts the movement amount of the product coordinate system by inputting the target value of the measurement point of the part that defines the product coordinate system in the product among the measurement points. To do. Therefore, after the product is molded, the product coordinate system can be adjusted in consideration of the processing adjustment amount of the molding die of the part that defines the product coordinate system in the product.

According to the present invention, the worker can grasp the magnitude of the deviation at a glance.

It is a block diagram which shows the structure of a shaping|molding die correction system. It is a figure which shows the example of a design product model. It is a figure which shows the example of measurement data. It is a figure which shows the example of an inter-axis inspection table. 5A to 5C are diagrams showing shift information plan views. It is a block diagram which shows the structure of a shaping|molding die correction data preparation apparatus. It is a flow chart which shows a flow of processing in a treating part. It is a figure explaining correspondence of a projection plane which projects a design product model, and shift information displayed on a projection plane. FIG. 9A is a displacement information plan view before switching the symbol indicating the displacement direction. FIG. 9B is a displacement information plan view after switching the symbol indicating the displacement direction. FIG. 10A is a plan view of the shift information before adjusting the display position of the shift information. FIG. 10B is a plan view of the deviation information after adjusting the display position of the deviation information. 11A and 11B are diagrams illustrating an example of a method of moving the display of the shift information. It is a figure which shows a shift information stereogram. It is a figure which shows a shift information stereogram. It is a figure which shows the example of a reference|standard adjustment window. It is a flow chart which shows a flow of processing in a standard adjustment part. It is a figure which shows the shift information solid figure after adjustment of a product coordinate system. It is a figure explaining a hole and an end face which have an adjustment allowance. It is a figure which shows the example of an RPS reference|standard adjustment window. It is a flow chart which shows a flow of processing in a standard adjustment part. It is a figure which shows a best fit reference|standard adjustment window. It is a flow chart which shows a flow of processing in a standard adjustment part.

Hereinafter, the present invention will be described through embodiments of the invention. The following embodiments do not limit the invention according to the claims. Not all combinations of the features described in the embodiments are essential to the solving means of the invention.

[First Embodiment]
[Structure of Mold Correction System]
FIG. 1 is a block diagram showing the configuration of a molding die correction system 10. The molding die correction system 10 includes a design product CAD data creation device 12, a molding die machining NC program creation device 14, a molding die processing machine 16, a product molding machine 18, a three-dimensional measuring machine 20, and a molding die correction data creation device 22. doing.

The designed product CAD data creation device 12 is a personal computer or the like, and is a device in which CAD is installed as software. The design product CAD data creation device 12 is operated by an operator to design a design product model 50 including the three-dimensional shape of the product and other attribute data. FIG. 2 is a diagram showing an example of the designed product model 50. The designed product model 50 is designed in a predetermined three-dimensional coordinate system (hereinafter referred to as a product coordinate system). The design product model 50 has, as other attribute data, coordinates (hereinafter referred to as design values) on the product coordinate system of the center position and the end face position of the hole on the design product model 50. The process of designing the design product model 50 in the design product CAD data creation device 12 corresponds to the product design process of the present invention.

The molding die machining NC program creating device 14 is a personal computer or the like, and is a device in which CAD and CAM are installed as software. The molding die machining NC program creation device 14 designs a molding die model (not shown) based on the design product model 50 designed by the design product CAD data creation device 12. Further, the molding die machining NC program creation device 14 creates a numerical control program for machining the molding die in the molding die processing machine 16 based on the molding die model.

The molding die processing machine 16 is a numerically controlled machine tool that performs machining according to a numerical control program. Molding die machining In accordance with a numerical control program created by the NC program creating device 14, machining of a molding die (not shown) is performed. The step of forming a forming die by the forming die processing machine 16 corresponds to the forming die forming step of the present invention.

The product forming machine 18 is a casting machine that performs casting using the forming die processed by the forming die processing machine 16. The product molding machine 18 prototype-molds a product (not shown). The process of trial-molding a product by the product molding machine 18 corresponds to the trial-molding process of the present invention.

The coordinate measuring machine 20 is an optical or contact type measuring machine. FIG. 3 is a diagram showing an example of the measurement data 52. The three-dimensional measuring machine 20 uses a predetermined three-dimensional coordinate system (hereinafter, referred to as a measurement coordinate system) to set a predetermined center position or end face position (hereinafter, also referred to as a measurement point) of a product hole on a product. Is measured as coordinates (hereinafter, referred to as a measured value), and the deviation between the measured value and the designed value is easily evaluated by the worker based on the information on the tolerance input to the coordinate measuring machine 20 in advance. The measurement data 52 is output. The measurement coordinate system basically uses the same coordinate system as the product coordinate system described above, but if a measurement coordinate system different from the product coordinate system is used, the measured value will be the same as the product coordinate system in the subsequent processing. Convert to system value. The process of measuring the measurement points of the product by the coordinate measuring machine 20 corresponds to the measurement process of the present invention.

Each measurement point has a four-digit identifier, as shown in FIG. Hereinafter, when referring to the individual measurement points, for example, an identifier such as the measurement point C313 is described, but when the individual measurement points are not referred to, the identifier is not attached.

The molding die correction data creation device 22 is a personal computer or the like, and based on the design product model 50 designed by the design product CAD data creation device 12 and the measurement data 52 output by the coordinate measuring machine 20, the axis This is a device for creating the inspection table 54. FIG. 4 is a diagram showing an example of the inter-axis inspection table 54. As shown in FIG. 4, the inter-axis inspection table 54 describes design values, tolerances, deviation information with respect to the design values, and the like at each measurement point. The molding die correction data creation device 22 will be described in detail later. The design product CAD data creation device 12, the molding die machining NC program creation device 14, and the molding die correction data creation device 22 may be configured by one device.

The molding die machining NC program creation device 14 creates a molding die correction drawing (not shown) based on the inter-axis inspection table 54 created by the molding die correction data creation device 22. The molding die machining NC program creation device 14 creates a numerical control program based on the molding die correction drawing. The molding die processing machine 16 corrects the molding die according to a numerical control program created based on the molding die modification drawing created by the molding die machining NC program creating device 14. The process of modifying the molding die by the molding machine 16 corresponds to the molding die modifying process.

[About mold correction]
The outline of the correction of the molding die will be described. 5A to 5C show the magnitude and direction of the deviation between the design value and the measurement value at each measurement point (hereinafter, the deviation size and direction are matched on a two-dimensional drawing obtained by projecting the designed product model 50 on a plane). (Also referred to as deviation information). Hereinafter, this drawing is referred to as a shift information plan view. 5A to 5C show the actual states of the drawings and are not provided with an identifier or a code.

As for the shift information of the center position of the hole, the shift size is displayed by a number, and the shift direction is displayed by an arrow symbol. In the end surface position deviation information, the deviation magnitude is displayed by a numeral, and the deviation direction is indicated by a symbol "concave" or "convex". The direction in which the deviation approaches the worker facing the display unit 26 (FIG. 6) is displayed as "convex", and the direction away from the worker is displayed as "concave". The unit of the displacement magnitude is [mm]. Further, the deviation information in which the deviation magnitude is within the tolerance range is displayed in blue, and the deviation information in which the deviation magnitude is outside the tolerance range is displayed in red. Note that since FIGS. 5A to 5C are displayed in black and white, the deviation information is displayed in black regardless of the magnitude of the deviation within the tolerance range, and only the deviation information that is outside the tolerance range is indicated by a square frame. It is surrounded and displayed.

By displaying the deviation information in this way, the operator can see at a glance whether the magnitude of the deviation of each measurement point is within the range of the tolerance and which direction the deviation of each measurement point is. Can be grasped.

The worker adjusts the position of the product coordinate system on the drawing based on the deviation information of each measurement point. When the product coordinate system is moved, the measured value changes as the product coordinate system moves. Therefore, the magnitude of the deviation of the measurement value at each measurement point with respect to the design value also changes. That is, by adjusting the position of the product coordinate system, it is possible to adjust the magnitude of the deviation of each measurement point. The worker adjusts the position of the product coordinate system so that the deviations at as many measurement points as possible fall within the tolerance range. Alternatively, the worker adjusts the position of the product coordinate system so that the size of the deviation is within the tolerance range at the measurement point of the part where the mold is difficult to modify or the part where man-hours are required for the modification. To do.

The molded product has holes and end faces for defining a product coordinate system on the product. In order to adjust the product coordinate system based on the measured values of the prototype molded product, there is an adjustment allowance in the hole center coordinates and end face position of the molding die. That is, an adjustment allowance for this mold is formed in the prototype molded product. For example, the diameter of the hole having the adjustment allowance is smaller than the diameter of the hole in the final product. After molding the product, at the position where the center position of the hole is shifted, by processing so that the diameter of the hole is increased, the center position of the hole of the molded product before the mold correction The position can be shifted. The position of the product coordinate system on the product is adjusted by processing a hole or an end surface having an adjustment allowance after molding the product. The correction of the mold is performed based on the magnitude and direction of the deviation of the measured value from the design value in the adjusted product coordinate system.

Conventionally, the deviation information of each measurement point is obtained by calculation, and the deviation information is described on the drawing (hereinafter referred to as deviation information describing operation) and the operation of adjusting the position of the product coordinate system (hereinafter referred to as standard adjustment operation). Was described by a person. The molding die correction data creation device 22 is a device that automates the work of describing the deviation information and automates part of the reference adjustment work.

[Molding die correction data creation device]
FIG. 6 is a block diagram showing the configuration of the molding die correction data creation device 22. The molding die correction data creation device 22 has an input unit 24, a display unit 26, and a main body 28.

The input unit 24 is a device operated by a worker such as a keyboard and a mouse. The display unit 26 is a display capable of displaying images, characters and the like. The main body 28 has a processing unit 30 and a storage unit 32. The processing unit 30 is a processor such as a CPU. The storage unit 32 is a storage medium such as a hard disk.

The processing unit 30 includes a design product model reading unit 34, a measurement data reading unit 36, a coordinate conversion unit 38, a deviation information calculation unit 40, an environment setting unit 42, a display control unit 44, a reference adjustment unit 46, and an inter-axis inspection table creation unit. Has 48.

The designed product model reading unit 34 reads the designed product model 50 from the designed product CAD data creation device 12. The measurement data reading unit 36 reads the measurement data 52 from the coordinate measuring machine 20. When the coordinate measuring unit 38 uses a measuring coordinate system different from the product coordinate system in the coordinate measuring machine 20, the coordinate transforming unit 38 transforms the measured value into a value in the same coordinate system as the product coordinate system. The deviation information calculation unit 40 calculates, from the designed product model 50 and the measurement data 52, the magnitude and direction of the deviation between the design value of the measurement point and the measurement value as deviation information. The process of calculating the shift information by the shift information calculating unit 40 corresponds to the shift information calculating process and the shift information recalculating process of the present invention.

The environment setting unit 42 makes settings relating to display of shift information in the shift information plan view. The display control unit 44 edits an image or the like displayed on the display unit 26, generates a control signal for displaying the image or the like on the display unit 26, and controls the display unit 26. The reference adjustment unit 46 adjusts the position of the product coordinate system. The step of adjusting the position of the product coordinate system by the reference adjusting unit 46 corresponds to the reference adjusting step of the present invention. The axis-to-axis inspection table creation unit 48 creates the axis-to-axis inspection table 54 based on the deviation information of each measurement point.

[Processing in processing unit]
FIG. 7 is a flowchart showing the flow of processing in the processing unit 30. In step S1, the designed product model reading unit 34 reads the designed product model 50 from the designed product CAD data creation device 12. In step S2, the measurement data reading unit 36 reads the measurement data 52 from the coordinate measuring machine 20. In step S3, when a coordinate system different from the product coordinate system is used in the coordinate measuring machine 20, the coordinate conversion unit 38 converts the measured value into a value in the same coordinate system as the product coordinate system.

In step S4, the shift information calculation unit 40 calculates the shift information of the measured value with respect to the design value at each measurement point. In step S5, it is determined whether the deviation information is displayed on the plan view or the stereoscopic view. The operator selects whether to display the shift information on the plan view or the three-dimensional view. For example, if there is no designation from the worker, it is determined that the shift information is displayed on the plan view, and the shift information is displayed when the worker specifies that the shift information is displayed on the stereoscopic view. It may be determined that the image is displayed on the stereoscopic view. When it is determined that the displacement information is displayed on the plan view, the process proceeds to step S6, and when it is determined that the displacement information is displayed on the stereoscopic view, the process proceeds to step S8.

In step S6, the environment setting unit 42 sets the environment for displaying the deviation information of the deviation information plan view. The following three settings are made as environment settings. First, in order to create displacement information plan views as shown in FIGS. 5A to 5C, the projection plane on which the designed product model 50 is projected and the displacement information to be displayed on the projection surface are set to correspond to each other. FIG. 8 is a diagram for explaining the correspondence between the projection surface on which the designed product model 50 is projected and the deviation information displayed on the projection surface. For example, when the operator uses the input unit 24 to input that the measurement points C351 and C352 are associated with the projection plane B, the environment setting unit 42 associates the measurement points C351 and C352 with the projection plane B. As a result, when the displacement information plan view is created, as shown in FIG. 5B, the displacement information of the measurement points C351 and C352 is displayed, but the displacement information of other measurement points is not displayed.

Secondly, the setting for switching the symbol indicating the displacement direction is performed. FIG. 9A is a displacement information plan view before switching the symbol indicating the displacement direction. FIG. 9B is a displacement information plan view after switching the symbol indicating the displacement direction. The measurement point 1101 is an end face position on a surface inclined with respect to the left side surface and the right side surface of the measurement point 1101 in FIGS. 9A and 9B, and the left side surface of the measurement point 1101 is on the back side of the drawing. The right side is on the front side of the figure. Since the measurement point 1101 is the end surface position, the symbol indicating the displacement direction is normally represented by “convex” (or “concave”) as shown in FIG. 9A. However, it is difficult for the worker to understand the inclination direction of the slope where the measurement point 1101 is located, and it is difficult to recognize the displacement direction, only by looking at FIG. 9A. The operator designates such a measurement point using the input unit 24, and the environment setting unit 42 switches the symbol indicating the direction of the deviation of the specified measurement point deviation information to the arrow.

Thirdly, the setting for adjusting the display position of the displacement information is performed. FIG. 10A is a plan view of the shift information before adjusting the display position of the shift information. FIG. 10B is a plan view of the deviation information after adjusting the display position of the deviation information. In FIG. 10A, the display of the displacement information between the measurement point C371 and the measurement point 1201 partially overlaps. The worker moves the display of the shift information using the input unit 24 to eliminate the overlap of the display of the shift information as shown in FIG. 10B. 11A and 11B are diagrams illustrating an example of a method of moving the display of the shift information. As shown in FIG. 11A, the method of moving the display of the deviation information is performed by inputting a numerical value to the deviation information position adjustment window 55 displayed on the display unit 26 by the worker, and performing the operation. Be seen. Alternatively, as shown in FIG. 11B, the shift information displayed on the display unit 26 is dragged by the worker.

In step S7, the display control unit 44 displays the displacement information plan view on the display unit 26 as shown in FIGS. 5A to 5C. In step S8, the display control unit 44 displays the deviation information on the three-dimensional drawing of the designed product model 50 on the display unit 26. 12 and 13 are diagrams showing a state in which the deviation information of each measurement point is displayed on the stereoscopic drawing of the designed product model 50 (hereinafter, referred to as deviation information stereoscopic view). As shown in FIGS. 12 and 13, the displacement information corresponding to each measurement point is displayed near each measurement point. The operator rotates the stereoscopic view of the designed product model 50 on the display unit 26 using the input unit 24, so that the designed product model 50 can be viewed from an arbitrary angle. The display format of the deviation information on the three-dimensional diagram of the designed product model 50 is the same as the description format of the deviation information of the deviation information plan view shown in FIGS. 5A to 5C. However, depending on the direction in which the designed product model 50 is viewed, the display of “concave” and “convex” is switched even if the information on the deviation of the same measurement point. What is shown as “convex 0.52” in FIG. 13 is the deviation information of the measurement point 1002, but since the designed product model 50 is viewed from a direction different from that in FIG. 12, it is “concave” in FIG. 12. While displayed, in FIG. 13, “convex” is displayed. The X-axis and Y-axis coordinate axes displayed in FIG. 13 indicate the product coordinate system. The process of displaying the displacement information plan view or the displacement information stereoscopic view on the display unit 26 by the display control unit 44 corresponds to the display process of the present invention.

In step S9, the reference adjustment unit 46 adjusts the position of the product coordinate system. The process of the reference adjustment unit 46 will be described in detail later. In step S10, the inter-axis inspection table creation unit 48 creates and outputs the inter-axis inspection table 54 based on the deviation information of each measurement point after the adjustment of the product coordinate system. As for the output of the inter-axis inspection table 54, the display control unit 44 may cause the display unit 26 to display the inter-axis inspection table 54, or the printer (not shown) may print out the inter-axis inspection table 54. Good. In step S11, the storage unit 32 stores various kinds of information such as the designed product model 50, the measurement data 52, the position of the adjusted product coordinate system, and the contents of environment settings.

[Standard adjustment processing]
FIG. 14 is a diagram showing an example of the reference adjustment window 60. As shown in FIG. 14, the reference adjustment window 60 includes text boxes 62a to 62c in which the parallel movement amounts of the product coordinate system in the X-axis direction, the Y-axis direction, and the Z-axis direction are input, and around the X-axis and around the Y-axis. , And text boxes 62d to 62f for inputting the rotational movement amount of the product coordinate system around the Z axis. Using the input unit 24, the worker can input the parallel movement amount of the product coordinate system in the X-axis direction, the Y-axis direction, and the Z-axis direction in the text boxes 62a to 62c, and the X-axis directions in the text boxes 62d to 62f. It is possible to input the rotational movement amount of the product coordinate system around the Y axis, the Y axis, and the Z axis.

Further, the reference adjustment window 60 has a preview button 64, an OK button 66, and a cancel button 68. The operator can click the preview button 64, the OK button 66, and the cancel button 68 using the input unit 24.

FIG. 15 is a flowchart showing the flow of processing in the reference adjustment unit 46. In step S21, the reference adjustment window 60 is displayed on the display unit 26, and the input of the movement amount of the product coordinate system by the worker is accepted. The process of step S21 is performed by the display control unit 44 according to a command from the reference adjustment unit 46.

In step S22, it is determined whether the preview button 64 has been clicked. When the preview button 64 is clicked, the process proceeds to step S23, and when the preview button 64 is not clicked, the process proceeds to step S25.

In step S23, the deviation information of the measurement value at each measurement point with respect to the design value in the moved product coordinate system is calculated. The process of step S23 is performed by the deviation information calculation unit 40 according to a command from the reference adjustment unit 46.

In step S24, a control signal is output to the display unit 26 so that the shift information of each measurement point calculated in step S23 is displayed as a shift information plan view or a shift information stereoscopic view. The process of step S24 is performed by the display control unit 44 according to a command from the reference adjustment unit 46. FIG. 16 is a diagram showing a displacement information stereoscopic view after the adjustment of the product coordinate system. Comparing FIG. 8 and FIG. 16, it can be seen that the deviation information of each measurement point changes before and after the adjustment of the product coordinate system. The worker clicks the preview button 64 every time when inputting the movement amount of the product coordinate system, and confirms the deviation information of each measurement point after moving the product coordinate system, while checking the position of the product coordinate system. Can be adjusted.

A step S25 decides whether or not the cancel button 68 has been clicked. When the cancel button 68 is clicked, the process proceeds to step S21, and when the cancel button 68 is not clicked, the process proceeds to step S26.

A step S26 decides whether or not the OK button 66 has been clicked. When the OK button 66 is clicked, the process proceeds to step S27, and when the OK button 66 is not clicked, the process proceeds to step S22.

In step S27, the deviation information of the measurement value at each measurement point with respect to the design value in the adjusted product coordinate system is calculated. The process of step S27 is performed by the deviation information calculation unit 40 according to a command from the reference adjustment unit 46. If the process of calculating the shift information in step S23 has already been performed, the process of step S27 may be skipped.

In step S28, a control signal is output to the display unit 26 so as to be displayed as the displacement information plan view or the displacement information stereoscopic view. The process of step S28 is performed by the display control unit 44 according to a command from the reference adjustment unit 46.

[Effect]
As described above, conventionally, the work of describing the deviation information and the reference adjustment work have been performed manually. However, when the number of measurement points becomes large, the amount of calculation of the deviation information and the number of pieces of the deviation information written in the drawing increase in the deviation information writing work, resulting in an increase in the work amount. In addition, miscalculations of misregistration information and errors in the drawings were likely to occur. Even in the standard adjustment work, it is necessary to calculate the deviation information in the product coordinate system after the movement each time the product coordinate system is moved, so that the calculation takes time and the calculation error is likely to occur. Furthermore, the adjustment of the position of the product coordinate system is often based on empirical rules, and it takes a long time for the operator who is in charge of the reference adjustment work. It was also a cause of variations in dimensional quality.

Therefore, in the present embodiment, the molding die correction data creation device 22 calculates the deviation information between the measured value of each measurement point and the design value of the point on the designed product model 50 corresponding to each measurement point. Further, the deviation information is displayed on the designed product model 50 displayed on the display unit 26. This makes it possible to automate the work of describing the deviation information, reduce the work amount of the worker, and improve the accuracy of the deviation information.

Further, in the molding die correction data creation device 22, each time the product coordinate system is moved, the deviation information of each measurement point with respect to the design value in the moved product coordinate system is calculated, and the designed product model 50 displayed on the display unit 26 is calculated. Display shift information on top. The worker can adjust the position of the product coordinate system while checking the deviation information of each measurement point due to the movement of the product coordinate system, reducing the work amount of the worker and reducing the time required for the adjustment. It can be shortened.

Further, in the molding die correction data creation device 22, when displaying the deviation information on the display unit 26, the deviation information whose deviation magnitude is within the tolerance range is displayed in blue, and the deviation information outside the tolerance range is displayed. Is displayed in red. Thereby, the worker can grasp at a glance whether the magnitude of the deviation of each measurement point is within the range of the tolerance.

Further, in the molding die correction data creation device 22, with respect to the deviation information of the end surface position displayed on the display unit 26, the deviation direction is displayed with a symbol of “concave” or “convex”, and the deviation information of the center position of the hole is The direction of deviation is indicated by the arrow symbol. Thereby, the worker can grasp at a glance which direction the displacement direction of each measurement point is.

[Second Embodiment]
The second embodiment is partially different from the first embodiment in the content of the processing in the reference adjustment unit 46. As described in the first embodiment, the product after molding has holes and end faces for defining the product coordinate system on the product, and the product coordinate system is formed based on the measured values of the prototype molded product. In order to make the adjustment, the holes and end faces of the mold have an adjustment allowance for adjusting the center position and end face position of the holes. That is, an adjustment allowance for this mold is formed in the prototype molded product. In the first embodiment, the product coordinate system is adjusted by inputting the movement amount of the product coordinate system, but in the second embodiment, the center position of the hole is adjusted for holes and end faces having adjustment allowances. Adjust the product coordinate system by inputting the or end face position.

[Standard adjustment processing]
In the second embodiment, the product coordinate system called RPS reference adjustment is adjusted. In the RPS reference adjustment, the position of the product coordinate system is adjusted by setting the target values of the center position and the end surface position of the hole arbitrarily selected by the worker for the hole and the end surface having the adjustment allowance. FIG. 17 is a diagram illustrating a hole or an end surface having an adjustment allowance. In FIG. 17, holes or end faces (measurement points C311, C312, C313, 1001, 1002, 1003) surrounded by a chain double-dashed line have an adjustment allowance. For example, the measurement points 1001, 1002, and 1003 in FIG. 17 are end faces that define a plane in the height direction of the product coordinate system, but by intentionally setting the target values of these end face positions, It is possible to adjust the parallel movement and rotational movement of the plane in any way. Similarly, the measurement points C311, C312, and C313 in FIG. 17 are holes that define the axial directions of the width direction and the depth direction of the product coordinate system, but by intentionally setting these coordinate target values, Parallel and rotational movements can be adjusted in any direction on the height plane of the product coordinate system in the width direction and the depth direction. When the coordinate target values of the center position and the end face position that define the product coordinate system of the prototype molded product are clear, the RPS reference adjustment can suppress an increase in the work amount of the worker.

FIG. 18 is a diagram showing an example of the RPS reference adjustment window 70. As shown in FIG. 18, the RPS reference adjustment window 70 includes text boxes 72a to 72c in which the current values of the X axis, Y axis, and Z axis are displayed for each hole or end surface having an adjustment allowance, and the X axis and Y axis. , Z-axis target values are input into the text boxes 74a to 74c, and check boxes 76a to 76c into which a check for selecting an axis for inputting the target value is input. Using the input unit 24, the worker can input a check into the check boxes 76a to 76c of the axes for inputting the target values, and can input the target values into the text boxes 74a to 74c of the checked axes. it can.

Further, the RPS reference adjustment window 70 has a preview button 78, an OK button 80 and a cancel button 82. The operator can click the preview button 78, the OK button 80, and the cancel button 82 using the input unit 24.

FIG. 19 is a flowchart showing the flow of processing in the reference adjustment unit 46. In step S31, the RPS reference adjustment window 70 is displayed on the display unit 26, and the input of the target value of the position of the hole or the end surface having the adjustment allowance by the operator is accepted. The process of step S31 is performed by the display control unit 44 according to a command from the reference adjustment unit 46.

In step S32, it is determined whether the preview button 78 has been clicked. When the preview button 78 is clicked, the process proceeds to step S33, and when the preview button 78 is not clicked, the process proceeds to step S35.

In step S33, the deviation information of the measurement value at each measurement point with respect to the design value in the moved product coordinate system is calculated. The process of step S33 is performed by the deviation information calculation unit 40 according to a command from the reference adjustment unit 46.

In step S34, a control signal is output to the display unit 26 so that the shift information of each measurement point calculated in step S33 is displayed as a shift information plan view or a shift information stereoscopic view. A step S35 decides whether or not the cancel button 82 has been clicked. When the cancel button 82 is clicked, the process proceeds to step S31, and when the cancel button 82 is not clicked, the process proceeds to step S36.

A step S36 decides whether or not the OK button 80 has been clicked. When the OK button 80 is clicked, the process proceeds to step S37, and when the OK button 80 is not clicked, the process proceeds to step S32.

In step S37, the deviation information of the measurement value at each measurement point with respect to the design value in the adjusted product coordinate system is calculated. The process of step S37 is performed by the deviation information calculation unit 40 according to a command from the reference adjustment unit 46. If the process of calculating the shift information in step S33 has already been performed, the process of step S37 may be skipped.

In step S38, a control signal is output to the display unit 26 so as to be displayed as the displacement information plan view or the displacement information stereoscopic view. The process of step S38 is performed by the display control unit 44 according to a command from the reference adjustment unit 46.

[Effect]
In the second embodiment, in the molding die correction data creation device 22, the operator inputs the target value of the measurement point of the part that defines the product coordinate system of the product among the measurement points, so that the product coordinate system Adjust the movement amount. Therefore, after the product is molded, the product coordinate system can be adjusted in consideration of the processing adjustment amount of the molding die of the part that defines the product coordinate system in the product.

[Third Embodiment]
The third embodiment is partially different from the first embodiment in the contents of the processing in the reference adjusting unit 46. As described in the first embodiment, in the first embodiment, the operator inputs the movement amount of the product coordinate system, but in the third embodiment, the molding die correction data is input. The moving amount of the product coordinate system is calculated by the creating device 22.

[Standard adjustment processing]
FIG. 20 is a view showing the best fit reference adjustment window 84. In the third embodiment, the molding die correction data creation device 22 adjusts the product coordinate system called the best fit. In the best fit, the product coordinate system is adjusted so that the sum of the deviations of the measurement points is minimized. In the best fit, after measuring the product with the coordinate measuring machine 20, the output measurement data 52 is first calculated by the molding die correction data creation device 22 to calculate the sum of the deviations between the measurement values at all the measurement points and the design values. Then, after that, the molding die correction data creating device 22 causes the parallel displacement amount in the X-axis direction, the Y-axis direction, and the Z-axis direction and the X-axis direction in which the total sum of the deviations between the measured values and the design values at all the measuring points becomes the smallest. Rotational movement amounts about the circumference, the Y axis, and the Z axis are calculated. As a flow of this calculation method, for example, the X-axis parallel movement amount is in the range of −0.5 [mm] to 0.5 [mm] in 0.01 [mm] increments, and all measurement points are measured. The sum of the deviation between the value and the design value is calculated, and the X-axis parallel movement amount that minimizes the sum is determined. Subsequently, this flow is performed with the parallel movement amount in the Y-axis direction and the Z-axis direction and the rotational movement amount around the X axis, around the Y axis, and around the Z axis. Therefore, the total sum of the deviations between the measured values and the design values at all the measurement points is the smallest in the X-axis direction, the Y-axis direction, and the Z-axis direction. The amount of rotational movement around is determined, and the product coordinate system is adjusted.

For the best fit, there are two adjustment methods: partial best fit and overall best fit. In the partial best fit, the movement amount of the product coordinate system is calculated so that the sum of the magnitudes of the deviations of the selected measurement points is minimized. In the overall best fit, basically, the movement amount of the product coordinate system is calculated so that the sum of the displacement magnitudes of all the measurement points is minimized. The product coordinate system consists of the amount of movement due to partial best fit, the amount of movement due to overall best fit, the intermediate value between the amount of movement due to partial best fit and the amount of movement due to overall best fit, and the amount of movement due to partial best fit. Within the range that is sandwiched between the movement amount by the overall best fit, multiple values with different weights for each movement amount are calculated at the same time, and from the calculation result group, the worker selects the method for correcting the molding die. One calculation result is selected in consideration, and the product coordinate system is adjusted based on the value based on the selected calculation result.

As shown in FIG. 20, the best fit reference adjustment window 84 has a selection box 86a for selecting the measurement points used in the partial best fit and a selection box 86b for selecting the measurement points not used in the overall best fit. There is. The operator can use the input unit 24 to select measurement points to be used in the partial best fit, and select measurement points not to be used in the overall best fit. As the measuring points used in the partial best fit, the measuring points of the parts are selected as the measuring points of the part where the molding die is difficult to modify and the part requiring a lot of man-hours for the modification. As a result, it is possible to reduce the size of the deviation of the measurement points of the part that is difficult to modify the mold or the part that requires man-hours for modification by adjusting the position of the product coordinate system, which facilitates the modification of the mold. be able to. On the other hand, as the measurement points that are not used in the overall best fit, the measurement points of the part for which the correction allowance is set in advance are selected. In the prototype molded product, the part where the correction allowance is set is designed on the assumption that the molding die is modified after molding, and it is known in advance that the amount of deviation will be larger than other parts. Has been done. These deviations are disturbance factors that disturb the calculation accuracy in the calculation of the best fit for minimizing the total sum of the deviations of the respective measurement points. Therefore, by selecting the measurement point of the part for which the correction margin is set as the measurement point not used in the overall best fit, it is possible to improve the accuracy of adjusting the position of the product coordinate system of the other part.

The best fit criterion adjustment window 84 includes a weight set to the sum of the deviation magnitudes at the selected measurement points of the partial best fit and a weight set to the sum of the deviation magnitudes of all the measurement points of the overall best fit. It has a lever 88 for adjusting. The operator can use the input unit 24 to move the lever 88 between the partial best fit and the overall best fit.

For example, when the lever 88 is moved to the partial best fit side, the weight of the sum of the deviation sizes of the selected measurement points of the partial best fit is increased and the deviation size of all the measurement points of the overall best fit is increased. Reduce the weight of the sum of. As a result, the product coordinate system is adjusted with priority on the partial best fit.

Further, when the lever 88 is moved to the overall best fit side, the weight of the sum of displacement amounts due to the overall best fit is increased, and the weight of the sum of displacement amounts due to the partial best fit is decreased. As a result, the product coordinate system is adjusted with priority given to the overall best fit.

Furthermore, the best fit reference adjustment window 84 has a preview button 90, an OK button 92, and a cancel button 94. The worker can click the preview button 90, the OK button 92, and the cancel button 94 using the input unit 24.

FIG. 21 is a flow chart showing the flow of processing in the reference adjustment unit 46. In step S41, the best fit reference adjustment window 84 is displayed on the display unit 26, and the operator's input of the selection of the measurement point used in the partial best fit is accepted. In step S42, an input for selecting a measurement point that is not used in the overall best fit is accepted. In step S43, an input for setting the weight of the partial best fit is accepted. The processing of steps S41 to S43 is performed by the display control unit 44 according to a command from the reference adjustment unit 46.

In step S44, it is determined whether the preview button 90 has been clicked. When the preview button 90 is clicked, the process proceeds to step S45, and when the preview button 90 is not clicked, the process proceeds to step S47.

In step S45, the amount of movement of the product coordinate system is calculated, and the deviation information of the measured value at each measurement point with respect to the design value in the moved product coordinate system is calculated. The amount of movement of the product coordinate system was obtained by adding the sum of the deviation magnitudes at the selected measurement points by the partial best fit and the sum of the deviation magnitudes at the measurement points by the overall best fit after setting the weights. The value is calculated to be small. The process of step S45 is performed by the deviation information calculation unit 40 according to a command from the reference adjustment unit 46.

In step S46, a control signal is output to the display unit 26 so that the shift information of each measurement point calculated in step S45 is displayed as a shift information plan view or a shift information stereoscopic view. A step S47 decides whether or not the cancel button 94 has been clicked. When the cancel button 94 is clicked, the process proceeds to step S41, and when the cancel button 94 is not clicked, the process proceeds to step S48.

A step S48 decides whether or not the OK button 92 is clicked. When the OK button 92 is clicked, the process proceeds to step S49, and when the OK button 92 is not clicked, the process proceeds to step S43.

In step S49, the movement amount of the product coordinate system is calculated, and the deviation information of the measurement value of each measurement point with respect to the design value in the product coordinate system after the movement is calculated. The process of step S49 is performed by the deviation information calculation unit 40 according to a command from the reference adjustment unit 46. If the process of calculating the shift information in step S45 has already been performed, the process of step S49 may be skipped.

In step S50, a control signal is output to the display unit 26 so as to be displayed as a displacement information plan view or a displacement information stereoscopic view. The process of step S50 is performed by the display control unit 44 according to a command from the reference adjustment unit 46.

[Effect]
In the third embodiment, in the molding die correction data creation device 22, the product coordinate system is moved so that the sum of the deviation magnitudes at the measurement points becomes smaller. Therefore, it is possible to automatically adjust the product coordinate system, reduce the work amount of the worker, and reduce the variation in the amount of movement of the product coordinate system due to the difference in experience and ability of each worker. As a result, the dimensional quality of the product can be improved.

Further, in the molding die correction data creation device 22, a partial best fit for calculating the movement amount of the product coordinate system so that the sum of the deviation magnitudes at the selected measurement points becomes small, and the deviation magnitudes at all the measurement points. The overall best fit for calculating the amount of movement of the product coordinate system is performed so that the sum of the two becomes smaller. Then, the value of the movement amount by the partial best fit, the value of the movement amount by the whole best fit, the intermediate value between the movement amount by the partial best fit and the movement amount by the whole best fit, and the movement amount by the partial best fit and the whole best fit. Within the range sandwiched by the amount of movement due to, the value of multiple changes in each amount of movement is calculated at the same time, and the operator considers the correction method of the molding die from the calculation result group. One calculation result is selected, and the product coordinate system is adjusted with the value based on the selected calculation result as the final movement amount.

Therefore, it is possible to easily correct the molding die by adjusting the weights so that the partial best fit is prioritized with respect to the measurement point of the portion where the molding die is difficult to modify or the portion where the number of man-hours is required for the modification.

[Other Embodiments]
Although the present invention has been described using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is needless to say that various changes or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

Claims (3)

A product design step of designing a design product model (50) having a product three-dimensional shape and design value information on a product coordinate system which is a preset three-dimensional coordinate system;
A mold making step of making a mold for molding the product based on the designed product model (50);
A trial molding step of trial molding a product using the molding die,
Positions of a plurality of measurement points in the prototype molded product, a measurement step of measuring on a measurement coordinate system that is a preset three-dimensional coordinate system,
A deviation information calculating step of calculating a magnitude of deviation between a measured value of the measuring point measured in the measuring step and a design value of a point on the designed product model (50) corresponding to the measuring point;
A drawing showing the shape of the product of the designed product model (50) and a display step of displaying the size of the deviation on a display unit (26);
A reference adjustment step of adjusting the position of the product coordinate system so that the magnitude of the deviation at the measurement point becomes small,
A deviation information recalculation step of calculating the magnitude of the deviation with respect to the design value in the adjusted product coordinate system,
A position of the product coordinate system on the product, so as to be the position of the product coordinate system after adjustment in the reference adjustment step, a mold correction step of correcting the mold,
Have
In the reference adjusting step, the product coordinate system is adjusted so that the sum of the magnitudes of the deviations at the measurement points becomes small,
In the reference adjustment step, a partial best fit that calculates the amount of movement of the product coordinate system so that the sum of the magnitudes of the deviations at the selected measurement points becomes small, and the magnitudes of the deviations at all the measurement points. A total best fit for calculating the movement amount of the product coordinate system so that the sum of the values becomes smaller, the value of the movement amount by the partial best fit, the value of the movement amount by the whole best fit, and the portion. In the range between the movement amount by the best fit and the movement amount by the overall best fit, and within the range sandwiched between the movement amount by the partial best fit and the movement amount by the overall best fit, each of the above The calculation is performed at the same time by changing the weighting of the movement amount, and the worker selects one calculation result from the calculation result group in consideration of the correction method of the molding die, and the selected calculation is performed. A method for correcting a molding die, wherein the product coordinate system is adjusted based on a value obtained as a result. A method for modifying a molding die according to claim 1, wherein
In the reference adjusting step, a method for correcting a molding die, wherein a worker inputs a parallel movement amount of the product coordinate system and a rotation movement amount around each coordinate axis to adjust the movement amount of the product coordinate system. A method for modifying a molding die according to claim 1, wherein
In the reference adjustment step, among the measurement points, the target value of the measurement point of the part that defines the product coordinate system in the product, the worker adjusts the movement amount of the product coordinate system by inputting, Mold modification method.

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