CN110300968B - Method for correcting forming die - Google Patents
Method for correcting forming die Download PDFInfo
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- CN110300968B CN110300968B CN201880012135.6A CN201880012135A CN110300968B CN 110300968 B CN110300968 B CN 110300968B CN 201880012135 A CN201880012135 A CN 201880012135A CN 110300968 B CN110300968 B CN 110300968B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D47/00—Casting plants
- B22D47/02—Casting plants for both moulding and casting
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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Abstract
The method includes the steps of trial molding a product using a mold, measuring the positions of a plurality of measurement points in the trial molded product, calculating the magnitude of deviation between the measurement values and the design values of the measurement points, displaying the magnitude of deviation on a diagram of the shape of the product, adjusting the position of the product coordinate system of the product so that the magnitude of deviation of the measurement points is reduced, calculating the magnitude of deviation from the design values in the adjusted product coordinate system, and correcting the mold based on the calculated magnitude of deviation.
Description
Technical Field
The present invention relates to a method for correcting a molding die for molding a product.
Background
Japanese patent laid-open publication No. 2008-287468 discloses a method of trial molding a product using a molding die, and displaying a graph in which three-dimensional coordinate values of representative points of the trial molded product are expressed by relative coordinates based on design values of the representative points.
Disclosure of Invention
As shown in the technique of japanese patent laid-open publication No. 2008-287468, when information of a plurality of positions on a product is displayed by a graph, it is difficult for an operator to grasp at a glance whether the accuracy of the product is good.
The present invention has been made to solve the above-described problems, and an object thereof is to provide a method for correcting a mold, by which an operator can grasp at a glance whether or not the product accuracy is good.
The method for correcting a molding die of the present invention comprises: a product design step of designing a design product model having information on a three-dimensional shape and design values of a product on a product coordinate system which is a preset three-dimensional coordinate system; a molding die forming step of forming a molding die for molding the product based on the designed product model; a trial molding step of performing trial molding of a product using the molding die; a measurement step of measuring positions of a plurality of measurement points in the product to be trial-molded on a measurement coordinate system which is a preset three-dimensional coordinate system; a deviation information calculation step of calculating a magnitude of deviation between a measured value at the measurement point measured in the measurement step and a design value at a point on the design product model corresponding to the measurement point; a display step of displaying a diagram showing a shape of the product of the design product model and a magnitude of the deviation on a display unit; a reference adjustment step of adjusting a position of the product coordinate system so that a magnitude of the deviation of the measurement point is reduced; a deviation information recalculation step of calculating a magnitude of the deviation from a design value in the adjusted product coordinate system; and a mold correction step of correcting the mold based on the magnitude of the deviation calculated in the deviation information recalculation step.
In the reference adjustment step, the product coordinate system is adjusted so that the sum of the magnitudes of the deviations of the measurement points is reduced.
In the reference adjustment step, there are a partial best fit and a total best fit, wherein the partial best fit is a movement amount of the product coordinate system calculated so that a sum of magnitudes of the deviations of the selected measurement points decreases; the global best fit is a calculation of a movement amount of the product coordinate system so that a sum of magnitudes of the deviations of all the measurement points is reduced, and a calculation of a value obtained by changing a weight of each movement amount a plurality of times within a range between the movement amount based on the partial best fit and the movement amount based on the global best fit, and a value obtained by selecting 1 calculation result from the calculation result group in consideration of a correction method of a molding die by an operator, and adjusting the product coordinate system based on the value obtained by the selected calculation result.
Therefore, the magnitude of the deviation is displayed on the product drawing, and therefore, the operator can grasp the magnitude of the deviation at a glance, thereby reducing the amount of work for the operator to adjust the product coordinate system. In addition, the correction of the molding die is performed according to the magnitude of the deviation after the position of the product coordinate system is adjusted, so that the correction of the molding die can be reduced.
Further, the adjustment of the product coordinate system can be automatically performed, thereby reducing the amount of work for the operator.
Further, by selecting a measurement point that is partially best fit to a portion where the mold correction is difficult or a portion where the correction takes time, the mold correction can be facilitated. Further, the weight of the sum of the magnitude of the deviation of the measurement points based on the partial best fit and the sum of the magnitude of the deviation of the measurement points based on the entire best fit can be set with the accuracy obtained for the location selected as the measurement point for performing the partial best fit.
In the reference adjustment step, the operator inputs the amount of parallel movement and the amount of rotational movement about each coordinate axis of the product coordinate system to adjust the amount of movement of the product coordinate system. Therefore, the amount of movement of the product coordinate system can be input in a form intuitively easy for the operator to understand.
In the reference adjustment step, the operator inputs a target value of the measurement point at a position of the product defining the product coordinate system among the measurement points, thereby adjusting the movement amount of the product coordinate system. Therefore, after the product is molded, the product coordinate system can be adjusted in consideration of the machining adjustment amount of the molding die at the portion of the product that defines the product coordinate system.
According to the present invention, the operator can grasp the magnitude of the deviation at a glance.
Drawings
Fig. 1 is a block diagram showing a configuration of a mold correction system.
Fig. 2 is a diagram showing an example of designing a product model.
Fig. 3 is a diagram showing an example of measurement data.
Fig. 4 is a diagram showing an example of the interaxial check table.
Fig. 5A to 5C are diagrams showing a deviation information plan view.
Fig. 6 is a block diagram showing the configuration of the molding die correction data creation device.
Fig. 7 is a flowchart showing a flow of processing in the processing unit.
Fig. 8 is a diagram illustrating a correspondence relationship between a projection surface on which a design product model is projected and deviation information displayed on the projection surface.
Fig. 9A is a plan view showing the misalignment information before switching the sign indicating the direction of the misalignment. Fig. 9B is a plan view showing the offset information after switching the sign indicating the offset direction.
Fig. 10A is a plan view of the deviation information before the display position of the deviation information is adjusted. Fig. 10B is a plan view of the deviation information after the display position of the deviation information is adjusted.
Fig. 11A and 11B are diagrams showing an example of a method of moving the display of the deviation information.
Fig. 12 is a perspective view showing the offset information.
Fig. 13 is a perspective view showing the offset information.
Fig. 14 is a diagram showing an example of the reference adjustment window.
Fig. 15 is a flowchart showing a flow of processing in the reference adjustment unit.
Fig. 16 is a view showing a perspective view of offset information after adjustment of the product coordinate system.
Fig. 17 is a diagram illustrating a hole and an end face having an adjustment amount.
Fig. 18 is a diagram showing an example of an RPS reference adjustment window.
Fig. 19 is a flowchart showing a flow of processing in the reference adjustment unit.
Fig. 20 is a diagram showing a best-fit reference adjustment window.
Fig. 21 is a flowchart showing a flow of processing in the reference adjustment unit.
Detailed Description
The present invention will be described below with reference to embodiments thereof. The following embodiments do not limit the invention described in the claims. All combinations of the features described in the embodiments are not necessarily essential to the solution of the invention.
[ 1 st embodiment ]
[ Structure of mold correction System ]
Fig. 1 is a block diagram showing a configuration of a mold correction system 10. The mold correction system 10 includes a designed product CAD data creation device 12, a mold processing NC program creation device 14, a mold processing machine 16, a product molding machine 18, a three-dimensional measuring machine 20, and a mold correction data creation device 22.
The design product CAD data creation device 12 is a personal computer or the like, and is a device in which CAD is mounted as software. The design product CAD data creation device 12 is operated by an operator to design a design product model 50 composed of a three-dimensional shape and other attribute data of a product. Fig. 2 is a diagram showing an example of designing a product model 50. The design 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) of the center position and the end surface position of the hole in the design product model 50 on a product coordinate system. In the designed product CAD data creation device 12, the step of designing the designed product model 50 corresponds to the product design step 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 creating device 14 performs design of a not-shown molding die model based on the design product model 50 designed by the design product CAD data creating device 12. The molding die machining NC program creation device 14 creates a numerical control program for machining a molding die from a molding die model by the molding die machining machine 16.
The molding machine 16 is a numerical control machine tool that performs machining according to a numerical control program. The machining of the not-shown mold is performed in accordance with the numerical control program created by the mold machining NC program creating device 14. The step of forming the molding die by the molding die processing machine 16 corresponds to the molding die forming step of the present invention.
The product molding machine 18 is a casting machine that performs casting using a mold processed by the mold processing machine 16. A product not shown is trial molded by the product molding machine 18. The step of trial molding the product by the product molding machine 18 corresponds to the trial molding step of the present invention.
The three-dimensional measuring machine 20 is an optical or contact measuring machine. Fig. 3 is a diagram showing an example of the measurement data 52. The three-dimensional measuring device 20 measures a center position and an end surface position (hereinafter also referred to as a measurement point) of a predetermined hole of a product as coordinates (hereinafter referred to as a measurement value) on a predetermined three-dimensional coordinate system (hereinafter referred to as a measurement coordinate system), and outputs a deviation between the measurement value and a design value as measurement data 52 for easy evaluation by an operator based on information of tolerance input in the three-dimensional measuring device 20 in advance. The measurement coordinate system basically uses the same coordinate system as the product coordinate system described above, but when a measurement coordinate system different from the product coordinate system is used, the measurement values are converted into values of the same coordinate system as the product coordinate system by the subsequent processing. The step of measuring the measurement point of the product by the three-dimensional measuring machine 20 corresponds to the measurement step of the present invention.
As shown in fig. 2, each measurement point has a 4-bit identifier. In the following, for example, although an identifier is added as indicated by measurement point C313 when an individual measurement point is described, an identifier is not added when an individual measurement point is not described.
The mold correction data creation device 22 is a personal computer or the like, and creates an interaxial check table 54 based on the design product model 50 designed by the design product CAD data creation device 12 and the measurement data 52 output from the three-dimensional measuring device 20. Fig. 4 is a diagram showing an example of the interaxial check table 54. As shown in fig. 4, the interaxial inspection table 54 stores design values, tolerances, deviation information from the design values, and the like of the respective measurement points. The mold correction data creating device 22 will be described in detail later. Further, the designed 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 constituted by 1 device.
The molding die machining NC program creating device 14 creates a not-shown molding die correction map based on the inter-axis check table 54 created in the molding die correction data creating device 22. The molding die machining NC program creating device 14 creates a numerical control program based on the molding die correction map. The mold processing machine 16 performs mold correction processing in accordance with a numerical control program created from a mold correction map created by the mold processing NC program creation device 14. The step of performing the mold correction process by the mold processing machine 16 corresponds to the mold correction step.
[ correction for Forming mold ]
The outline of the mold correction will be described. Fig. 5A to 5C are two-dimensional graphs obtained by projecting the design product model 50 on a plane, and are graphs in which the magnitude and direction of deviation between the design value and the measurement value at each measurement point (hereinafter, the magnitude and direction of deviation are also referred to as deviation information). This diagram is hereinafter referred to as a deviation information plan view. Fig. 5A to 5C do not include identifiers or symbols to show the actual state of the drawings.
In the deviation information of the center position of the hole, the magnitude of the deviation is indicated by a numeral, and the direction of the deviation is indicated by an arrow mark. In the deviation information of the end face position, the magnitude of the deviation is indicated by a numeral, and the direction of the deviation is indicated by a symbol of "concave" or "convex". The direction of deviation is displayed as "convex" in the direction in which the operator facing the display unit 26 (fig. 6) approaches, and is displayed as "concave" when the direction of deviation is away from the operator. The magnitude of the deviation is in mm. Then, the deviation information in which the magnitude of the deviation is within the tolerance is displayed in cyan, and the deviation information in which the magnitude of the deviation is outside the tolerance is displayed in red. Since fig. 5A to 5C are displayed in black and white, the deviation information is displayed in black regardless of whether the magnitude of the deviation is within the tolerance or outside the tolerance, and only the deviation information outside the tolerance is displayed surrounded by four square frames.
By displaying the deviation information in this manner, the operator can grasp whether the magnitude of the deviation at each measurement point is within the tolerance range or outside the tolerance range at a glance, and can also grasp in which direction the direction of the deviation at each measurement point is.
The operator adjusts the position of the product coordinate system on the graph based on the deviation information of each measurement point. When the product coordinate system is moved, the measurement value changes as the product coordinate system moves. Therefore, the magnitude of the deviation of the measured value from the design value at each measurement point also changes. That is, the size of the deviation of each measurement point can be adjusted by adjusting the position of the product coordinate system. The operator adjusts the position of the product coordinate system so that the magnitude of the deviation of as many measurement points as possible is within the tolerance. Alternatively, the operator adjusts the position of the product coordinate system so that the magnitude of the deviation of the measurement points at the portions where the correction of the mold is difficult or at the portions where the correction takes time falls within the tolerance range.
And forming holes and end faces for defining a product coordinate system on the product on the molded product. In order to adjust the product coordinate system based on the measured value of the test molded product, there are adjustment amounts in the hole center coordinates and the end face position of the molding die. That is, the adjustment amount of the molding die is formed in the trial molded product. For example, the diameter of the hole having the adjustment amount is formed smaller than the diameter of the hole on the final product. After the product is molded, the center position of the hole of the final product can be shifted from the center position of the hole of the molded product before the correction of the molding die by processing the product so as to increase the diameter of the hole at a position shifted from the center position of the hole. The position of the product coordinate system on the product is adjusted by processing the hole and the end face with the adjusting amount after the product is formed. The mold is corrected according to the magnitude and direction of the deviation of the measured value from the design value in the adjusted product coordinate system.
In the related art, deviation information of each measurement point is calculated, and an operation of describing the deviation information on a graph (hereinafter, referred to as deviation information description operation) and an operation of adjusting the position of a product coordinate system (hereinafter, referred to as reference adjustment operation) are performed by a person. The mold correction data creating device 22 is a device that automates the deviation information recording operation and also automates a part of the reference adjustment operation.
[ 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 mold correction data creating device 22 includes an input unit 24, a display unit 26, and a main body 28.
The input unit 24 is a device operated by an operator, 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 includes 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 interaxial check table creation unit 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 three-dimensional measuring machine 20. When a measurement coordinate system different from the product coordinate system is used in the three-dimensional measuring machine 20, the coordinate conversion unit 38 converts the measurement value into a value in the same coordinate system as the product coordinate system. The deviation information calculation unit 40 calculates the magnitude and direction of deviation between the design value and the measurement value at the measurement point as deviation information based on the design product model 50 and the measurement data 52. The step of calculating the deviation information by the deviation information calculating section 40 corresponds to the deviation information calculating step and the deviation information recalculating step of the present invention.
The environment setting unit 42 performs setting related to display of the deviation information in the deviation information plan view. The display control unit 44 edits an image or the like displayed on the display unit 26, and generates a control signal for displaying the image or the like on the display unit 26, thereby controlling 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 adjustment unit 46 corresponds to the reference adjustment step of the present invention. The interaxial check table creation unit 48 creates an interaxial check table 54 based on the deviation information at each measurement point.
[ treatment in the treatment section ]
Fig. 7 is a flowchart showing a 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 three-dimensional measurement device 20. In step S3, when a measurement coordinate system different from the product coordinate system is used in the three-dimensional measurement device 20, the coordinate conversion unit 38 converts the measurement value into a value in the same coordinate system as the product coordinate system.
In step S4, the deviation information calculation unit 40 calculates deviation information of the measurement value at each measurement point from the design value. In step S5, it is determined whether the deviation information is displayed on the plan view or the perspective view. The selection of whether the deviation information is displayed on the plan view or the perspective view is performed by the operator. For example, it may be: if there is no designation from the operator, it is determined that the deviation information is displayed on the plan view, and if there is a designation from the operator to display the deviation information on the perspective view, it is determined that the deviation information is displayed on the perspective view. The process proceeds to step S6 when it is determined that the deviation information is to be displayed on the plan view, and proceeds to step S8 when it is determined that the deviation information is to be displayed on the perspective view.
In step S6, the environment setting unit 42 performs environment setting for displaying the deviation information on the deviation information plan view. The environment setting was performed in the following 3 settings. In the first type, in order to create the deviation information plan views shown in fig. 5A to 5C, a projection surface on which the design product model 50 is projected and the deviation information displayed on the projection surface are set to be associated with each other. Fig. 8 is a diagram illustrating a correspondence relationship between a projection surface on which the design product model 50 is projected and the deviation information displayed on the projection surface. For example, when the operator inputs the fact that measurement point C351 and measurement point C352 are associated with projection plane B using input unit 24, environment setting unit 42 associates measurement point C351 and measurement point C352 with projection plane B. Accordingly, when the deviation information plane is created, as shown in fig. 5B, the deviation information of the measurement point C351 and the measurement point C352 is displayed, but the deviation information of the other measurement points is not displayed.
In the 2 nd method, the sign indicating the direction of the deviation is switched. Fig. 9A is a deviation information plan view before switching the sign indicating the deviation direction. Fig. 9B is a deviation information plan view after switching the sign indicating the deviation direction. The measurement point 1101 is the end face position on a face inclined with respect to the left and right faces of the measurement point 1101 in fig. 9A and 9B, the left face of the measurement point 1101 is located on the far side of the figure, and the right face is located on the near side of the figure. Since the measurement point 1101 is the end face position, a symbol indicating the direction of deviation as shown in fig. 9A is usually indicated by "convex" (or "concave"). However, it is difficult for the operator to know the inclination direction of the slope at the position of the measurement point 1101 and to recognize the direction of the deviation by looking at only one eye of fig. 9A. The operator specifies such a measurement point using the input unit 24, and switches the sign indicating the direction of deviation of the deviation information of the specified measurement point to an arrow by the environment setting unit 42.
The 3 rd is setting of the display position for adjusting the deviation information. Fig. 10A is a plan view of the deviation information before the display position of the deviation information is adjusted. Fig. 10B is a plan view of the deviation information after the display position of the deviation information is adjusted. In fig. 10A, the display portions of the measurement point C371 and the measurement point 1201 of the deviation information overlap. The operator moves the display of the deviation information using the input unit 24, and the overlapping of the display of the deviation information is eliminated as shown in fig. 10B. Fig. 11A and 11B are diagrams showing an example of a method of moving the display of the deviation information. As shown in fig. 11A, the method of shifting the display of the deviation information is performed by inputting the shift amount of the display of the deviation information in the form of a numerical value by the operator in the deviation information position adjustment window 55 displayed on the display unit 26. Alternatively, as shown in fig. 11B, the deviation information displayed on the display unit 26 is dragged by the operator.
In step S7, the display control unit 44 causes the display unit 26 to display the deviation information plan view as shown in fig. 5A to 5C. In step S8, the display control unit 44 causes the display unit 26 to display the deviation information on the perspective view of the design product model 50. Fig. 12 and 13 are views showing a state in which the deviation information at each measurement point is displayed on the perspective view of the design product model 50 (hereinafter referred to as deviation information perspective views). As shown in fig. 12 and 13, the deviation information corresponding to each measurement point is displayed in the vicinity of each measurement point. The operator can view the design product model 50 from an arbitrary angle by rotating the perspective view of the design product model 50 on the display unit 26 using the input unit 24. The display form of the deviation information on the perspective view of the design product model 50 is the same as the description form of the deviation information on the deviation information plan view shown in fig. 5A to 5C. However, in the direction of observing the design product model 50, the display of "concave" and "convex" is switched even for the deviation information of the same measurement point. The information indicated as "convex 0.52" in fig. 13 is the variation information of the measurement points 1002, but since the design product model 50 is viewed from a direction different from that of fig. 12, it is indicated as "convex" in fig. 13 as opposed to "concave" in fig. 12. The coordinate axes such as the X-axis and the Y-axis shown in fig. 13 represent a product coordinate system. The process of causing the display unit 26 to display the offset information plan view or the offset information perspective view 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 processing of the reference adjustment unit 46 will be described in detail later. In step S10, the interaxial check table creating unit 48 creates and outputs the interaxial check table 54 based on the deviation information of each measurement point after the adjustment of the product coordinate system. The inter-axis check table 54 may be output by causing the display control unit 44 to display the inter-axis check table 54 on the display unit 26, or by printing out the inter-axis check table 54 by a printer not shown. In step S11, the storage unit 32 stores various information such as the design product model 50, the measurement data 52, the position of the adjusted product coordinate system, and the contents of the environment setting.
[ reference adjustment treatment ]
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 for inputting the parallel movement amounts of the product coordinate system in the X-axis direction, the Y-axis direction, and the Z-axis direction, and text boxes 62d to 62f for inputting the rotational movement amounts of the product coordinate system around the X-axis, around the Y-axis, and around the Z-axis. The operator can input the parallel movement amounts 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 rotational movement amounts of the product coordinate system around the X-axis, around the Y-axis, and around the Z-axis in the text boxes 62d to 62f, using the input unit 24.
The reference adjustment window 60 includes a preview button 64, an OK button 66, and a cancel button 68. The operator can click on the preview button 64, the OK button 66, and the cancel button 68 using the input section 24.
Fig. 15 is a flowchart showing a flow of processing in the reference adjustment unit 46. In step S21, the display unit 26 displays the reference adjustment window 60, and receives the movement amount of the product coordinate system input by the operator. The process of step S21 is performed by the display control unit 44 in accordance with the instruction from the reference adjustment unit 46.
In step S22, it is determined whether or not the preview button 64 is clicked. The process proceeds to step S23 when the preview button 64 is clicked, and proceeds to step S25 when the preview button 64 is not clicked.
In step S23, deviation information of the measured values from the design values at the respective measurement points in the product coordinate system after the movement is calculated. The process of step S23 is performed by the deviation information calculation unit 40 in accordance with the command from the reference adjustment unit 46.
In step S24, a control signal is output to the display unit 26 to display the deviation information of each measurement point calculated in step S23 as a deviation information plan view or a deviation information perspective view. The process of step S24 is performed by the display control unit 44 in accordance with the instruction from the reference adjustment unit 46. Fig. 16 is a view showing a perspective view of offset information after adjustment of the product coordinate system. When fig. 8 and 16 are compared, it is understood that the deviation information of each measurement point changes before and after the adjustment of the product coordinate system. The operator can adjust the position of the product coordinate system by clicking the preview button 64 every time the operator inputs the movement amount of the product coordinate system while checking the deviation information of each measurement point after the movement of the product coordinate system.
Step S25 determines whether the cancel button 68 is clicked. The process proceeds to step S21 when the cancel button 68 is clicked, and proceeds to step S26 when the cancel button 68 is not clicked.
Step S26 determines whether the OK button 66 is clicked. The process proceeds to step S27 when the OK button 66 is clicked, and proceeds to step S22 when the OK button 66 is not clicked.
In step S27, deviation information of the measured values from the design values at the respective measurement points in the adjusted product coordinate system is calculated. The process of step S27 is performed by the deviation information calculation unit 40 in accordance with the command from the reference adjustment unit 46. In the case where the process of calculation of the deviation information in step S23 has been performed, the process of step S27 may also be skipped.
In step S28, a control signal is output to the display unit 26 to be displayed as a deviation information plan view or a deviation information perspective view. The process of step S28 is performed by the display control unit 44 in accordance with the instruction from the reference adjustment unit 46.
[ Effect ]
As described above, in the conventional technique, the deviation information recording operation and the reference adjustment operation are performed by a person. However, when there are a plurality of measurement points, the amount of calculation of the deviation information and the number of descriptions of the deviation information in the map increase in the deviation information description work, and the work amount increases. In addition, errors in calculation of the deviation information and errors in description of the graph are likely to occur. In the reference adjustment work, calculation of the deviation information in the product coordinate system after the movement is necessary every time the product coordinate system is moved, and therefore, calculation takes time and calculation errors are liable to occur. Further, the adjustment of the position of the product coordinate system is based on many empirical rules, and the adjustment requires a long time for an operator who is responsible for the reference adjustment work, and as a result, the dimensional quality of the product varies due to the difference in experience and ability of the operator.
Therefore, in the present embodiment, the mold correction data creation device 22 calculates deviation information between the measured values at the respective measurement points and the design values at the points on the design product model 50 corresponding to the respective measurement points. Then, the deviation information is displayed on the design product model 50 displayed on the display unit 26. Accordingly, the operation of recording the deviation information can be automated, the workload of the operator can be reduced, and the accuracy of the deviation information can be improved.
In the mold correction data creation device 22, every time the product coordinate system is moved, deviation information of each measurement point in the moved product coordinate system from the design value is calculated, and the deviation information is displayed on the design product model 50 displayed on the display unit 26. The operator can adjust the position of the product coordinate system while checking the deviation information of each measurement point accompanying the movement of the product coordinate system, thereby reducing the workload of the operator and shortening the time required for adjustment.
In the mold correction data creation device 22, when the display unit 26 displays the variation information, the variation information in which the magnitude of the variation is within the tolerance is displayed in cyan, and the variation information in which the magnitude of the variation is outside the tolerance is displayed in red. Accordingly, the operator can grasp at a glance whether the magnitude of the deviation at each measurement point is within the tolerance range or outside the tolerance range.
In the mold correction data creation device 22, the direction of the deviation is indicated by a symbol such as "concave" or "convex" with respect to the deviation information displayed on the end face position of the display unit 26, and the direction of the deviation is indicated by an arrow symbol with respect to the deviation information on the center position of the hole. Accordingly, the operator can grasp at a glance which direction the deviation direction of each measurement point is.
[ 2 nd embodiment ]
[ reference adjustment treatment ]
In embodiment 2, adjustment of a product coordinate system called RPS reference adjustment is performed. In the RPS reference adjustment, target values of the center position and the end face position of the hole arbitrarily selected by the operator are set for the hole and the end face having the adjustment amount, and the position of the product coordinate system is adjusted based on the target values. Fig. 17 is a diagram illustrating a hole and an end face having an adjustment amount. In fig. 17, the holes and end faces (measurement points C311, C312, C313, 1001, 1002, and 1003) surrounded by the double-dashed circle have adjustment amounts. For example, the measurement points 1001, 1002, and 1003 in fig. 17 are end faces defining a plane in the height direction of the product coordinate system, but by intentionally setting target values of the positions of these end faces, it is possible to adjust the parallel movement or the rotational movement to the plane in the height direction in any way. Similarly, the measurement points C311, C312, and C313 in fig. 17 are holes for defining the axial directions in the width direction and the depth direction of the product coordinate system, but by intentionally setting their coordinate target values, it is possible to perform the parallel movement or the rotational movement in the axial direction adjustment in the width direction and the depth direction on the height plane of the product coordinate system in any case. When the target coordinate values of the center position and the end face position of the hole defining the product coordinate system of the test molded product are clear, the RPS reference adjustment can suppress an increase in the amount of work performed by the operator.
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 for displaying current values of the X, Y, and Z axes, text boxes 74a to 74c for inputting target values of the X, Y, and Z axes, and check boxes 76a to 76c for checking the axes for inputting the target values, for each hole having an adjustment amount and each end face. The operator can input a check in the check boxes 76a to 76c of the axes for inputting the target values and input the target values in the text boxes 74a to 74c of the axes for which the check is made, using the input unit 24.
The RPS reference adjustment window 70 includes a preview button 78, an OK button 80, and a cancel button 82. The operator can click on preview button 78, OK button 80, and cancel button 82 using input unit 24.
Fig. 19 is a flowchart showing a 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 target values of the positions of the hole and the end face having the adjustment amount are received as input by the operator. The process of step S31 is performed by the display control unit 44 in accordance with the instruction from the reference adjustment unit 46.
In step S32, it is determined whether or not the preview button 78 is clicked. The process proceeds to step S33 when the preview button 78 is clicked, and proceeds to step S35 when the preview button 78 is not clicked.
In step S33, deviation information of the measured values from the design values at the respective measurement points in the product coordinate system after the movement is calculated. The process of step S33 is performed by the deviation information calculation unit 40 in accordance with the command from the reference adjustment unit 46.
In step S34, a control signal is output to the display unit 26 so that the deviation information at each measurement point calculated in step S33 is displayed as a deviation information plan view or a deviation information perspective view. Step S35 determines whether the cancel button 82 is clicked. The process proceeds to step S31 when the cancel button 82 is clicked, and proceeds to step S36 when the cancel button 82 is not clicked.
Step S36 determines whether or not the OK button 80 is clicked. The process proceeds to step S37 when the OK button 80 is clicked, and proceeds to step S32 when the OK button 80 is not clicked.
In step S37, deviation information of the measured values from the design values at the respective measurement points in the adjusted product coordinate system is calculated. The process of step S37 is performed by the deviation information calculation unit 40 in accordance with the command from the reference adjustment unit 46. In the case where the calculation processing of the deviation information in step S33 has been performed, the processing of step S37 may also be skipped.
In step S38, a control signal is output to the display unit 26 to be displayed as a deviation information plan view or a deviation information perspective view. The process of step S38 is performed by the display control unit 44 in accordance with the instruction from the reference adjustment unit 46.
[ Effect ]
In embodiment 2, in the mold correction data creating apparatus 22, the operator inputs a target value of a measurement point at a position of a predetermined product coordinate system in a product among measurement points, and adjusts the movement amount of the product coordinate system. Therefore, after the product is molded, the product coordinate system can be adjusted in consideration of the machining adjustment amount of the molding die at the portion of the product that defines the product coordinate system.
[ 3 rd embodiment ]
[ reference adjustment treatment ]
Fig. 20 is a diagram showing the best-fit reference adjustment window 84. In embodiment 3, the mold correction data creation device 22 adjusts a product coordinate system called best fit. In the best fit, the product coordinate system is adjusted so that the sum of the magnitudes of the deviations of the respective measurement points becomes minimum. After the product is measured by the three-dimensional measuring machine 20, the mold correction data creation device 22 first calculates the sum of the deviations of the measured values from the design values at all the measurement points for the measurement data 52 to be output, and then the mold correction data creation device 22 calculates the parallel movement amounts in the X-axis direction, the Y-axis direction, and the Z-axis direction and the rotational movement amounts around the X-axis, the Y-axis, and the Z-axis, which minimize the sum of the deviations of the measured values from the design values at all the measurement points. As a flow of this calculation method, for example, the sum of the deviations of the measured values from the design values at all the measurement points is calculated in 0.01[ mm ] for the parallel movement amount of the X axis in the range from-0.5 [ mm ] to 0.5[ mm ], and the parallel movement amount of the X axis at which the sum becomes minimum is determined. Next, this flow is also performed for the amount of parallel movement in the Y axis direction and the Z axis direction and the amount of rotational movement about the X axis, the Y axis, and the Z axis. Therefore, the product coordinate system is finally adjusted by determining the amount of parallel movement in the X-axis direction, the Y-axis direction, and the Z-axis direction, and the amount of rotational movement about the X-axis, the Y-axis, and the Z-axis, which minimize the sum of the deviations between the measured values and the design values at all the measurement points.
Two adjusting methods of partial optimal fitting and overall optimal fitting are prepared in the optimal fitting. 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 becomes minimum. In the global optimum fit, the movement amount of the product coordinate system is calculated so that the sum of the magnitudes of the deviations of substantially all the measurement points becomes the minimum. Simultaneously, a value of a movement amount based on the partial best fit, a value of a movement amount based on the entire best fit, a median value of the movement amount based on the partial best fit and the movement amount based on the entire best fit, and a value in which the weight of each movement amount is changed a plurality of times within a range between the movement amount based on the partial best fit and the movement amount based on the entire best fit are calculated in a product coordinate system, and an operator selects 1 calculation result from the calculation result group in consideration of a correction method of the molding die, and adjusts the product coordinate system in accordance with 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 block 86b for selecting measurement points that are not used in the global best fit. The operator can select, using the input unit 24, measurement points used for partial best-fit, and can select measurement points not used for overall best-fit. As the measurement points used for the partial best fit, measurement points are selected at positions where the correction of the mold is difficult or at positions where the correction takes time. In this way, the size of the deviation of the measurement points at the portion where the correction of the mold is difficult or the portion where the correction takes time can be reduced by adjusting the position of the product coordinate system, and thus the correction of the mold can be facilitated. On the other hand, as the measurement points that are not used in the overall best fit, the measurement points of the portion where the correction amount is set in advance are selected. In the trial molded product, the portion where the correction amount is set is designed on the premise that the correction processing is performed on the molding die after molding, and it is known in advance that the magnitude of the deviation is increased as compared with other portions. These deviations are interference factors that disturb the calculation accuracy in the calculation of the best fit for minimizing the sum of the deviations at the respective measurement points. Therefore, by selecting the measurement points at the position where the correction amount is set as the measurement points that are not used in the overall best fit, the accuracy of adjusting the position of the product coordinate system at other positions can be improved.
The best-fit reference adjustment window 84 has an adjustment bar 88 for adjusting the sum of the magnitudes of deviations on the measurement points selected for the partial best fit and the sum of the magnitudes of deviations for all the measurement points for the global best fit. The operator can use the input 24 to move the adjustment bar 88 between a partial best fit and a global best fit.
For example, when the adjustment bar 88 is moved to the partial best fit side, the weight of the sum of the magnitudes of deviations of the measurement points selected by the partial best fit is increased, and the weight of the sum of the magnitudes of deviations of all the measurement points of the entire best fit is decreased. Accordingly, the adjustment of the product coordinate system with the priority part of the best fit is performed.
In addition, when the adjustment bar 88 is moved to the global best fit side, the weight of the sum of the magnitudes of the deviations based on the global best fit is increased, and the weight of the sum of the magnitudes of the deviations based on the partial best fit is decreased. Accordingly, the product coordinate system with the prior overall optimal fitting is adjusted.
Also, the best fit reference adjustment window 84 has a preview button 90, an OK button 92, and a cancel button 94. The operator can click preview button 90, OK button 92, and cancel button 94 using input unit 24.
Fig. 21 is a flowchart showing a flow of processing in the reference adjustment unit 46. In step S41, the optimal fitting reference adjustment window 84 is displayed on the display unit 26, and the selection of the measurement point to be used for the partial optimal fitting input by the operator is accepted. In step S42, selection of measurement points that are not used for the global best fit is received as input. In step S43, the setting of the weight of the partial best fit is accepted as an input. The processing in steps S41 to S43 is performed by the display control unit 44 in accordance with the instruction from the reference adjustment unit 46.
In step S44, it is determined whether or not preview button 90 is clicked. The process proceeds to step S45 when the preview button 90 is clicked, and proceeds to step S47 when the preview button 90 is not clicked.
In step S45, the movement amount of the product coordinate system is calculated, and deviation information of the measurement value of each measurement point in the product coordinate system after the movement from the design value is calculated. The amount of movement of the product coordinate system is calculated in the following manner: the sum of the magnitudes of deviations of the selected measurement points based on the partial best fit and the sum of the magnitudes of deviations of the measurement points based on the overall best fit after the weights are set is reduced. The process of step S45 is performed by the deviation information calculation unit 40 in accordance with the command from the reference adjustment unit 46.
In step S46, a control signal is output to the display unit 26 to display the deviation information of each measurement point calculated in step S45 as a deviation information plan view or a deviation information perspective view. Step S47 determines whether the cancel button 94 is clicked. The process proceeds to step S41 when the cancel button 94 is clicked, and proceeds to step S48 when the cancel button 94 is not clicked.
Step S48 determines whether or not the OK button 92 is clicked. The process proceeds to step S49 when the OK button 92 is clicked, and proceeds to step S43 when the OK button 92 is not clicked.
In step S49, the movement amount of the product coordinate system is calculated, and information on the deviation of the measurement value from the design value at each measurement point in the product coordinate system after the movement is calculated. The process of step S49 is performed by the deviation information calculation unit 40 in accordance with the command from the reference adjustment unit 46. In the case where the process of calculation of the deviation information in step S45 has been performed, the process of step S49 may also be skipped.
In step S50, a control signal is output to the display unit 26 to be displayed as a deviation information plan view or a deviation information perspective view. The process of step S50 is performed by the display control unit 44 in accordance with the instruction from the reference adjustment unit 46.
[ Effect ]
In embodiment 3, the mold correction data creating device 22 moves the product coordinate system so that the sum of the magnitudes of the deviations of the measurement points is reduced. Therefore, the adjustment of the product coordinate system can be automatically performed, thereby reducing the workload of the operator, and reducing the error of the movement amount of the product coordinate system due to the difference of the experience and the capability of each operator, as a result, the dimensional quality of the product can be improved.
Then, in the mold correction data creation device 22, a partial best fit in which the amount of movement of the product coordinate system is calculated so that the sum of the magnitudes of the deviations of the selected measurement points is reduced and a total best fit are performed; the global best fit calculates the amount of movement of the product coordinate system in such a way that the sum of the magnitudes of the deviations of all measured points is reduced. Then, the calculation of the value of the movement amount based on the partial best fit, the value of the movement amount based on the entire best fit, the intermediate value between the movement amount based on the partial best fit and the movement amount based on the entire best fit, and the value of the weight of each movement amount which is changed a plurality of times within the range between the movement amount based on the partial best fit and the movement amount based on the entire best fit is performed simultaneously, the operator selects 1 calculation result from the calculation result group in consideration of the correction method of the molding die, and adjusts the product coordinate system using the value based on the selected calculation result as the final movement amount.
Therefore, the weight is adjusted so as to be optimally fitted to the measurement point priority portion of the portion where the correction of the mold is difficult or the portion where the correction takes time, and thereby the correction of the mold can be facilitated.
[ other embodiments ]
The present invention has been described above using the embodiments, but 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 modifications and improvements can be added to the above embodiment. It is apparent from the description of the scope of the present invention that various modifications or improvements can be added to the present invention.
Claims (3)
1. A method for correcting a molding die, comprising:
a product design step of designing a design product model (50) having information on the three-dimensional shape and design value of a product on a product coordinate system which is a preset three-dimensional coordinate system;
a molding die forming step of forming a molding die for molding the product on the basis of the design product model (50);
a trial molding step of performing trial molding of a product using the molding die;
a measurement step of measuring positions of a plurality of measurement points in the product to be trial-molded on a measurement coordinate system which is a preset three-dimensional coordinate system;
a deviation information calculation step of calculating the magnitude of deviation between the measurement value of the measurement point measured in the measurement step and the design value of a point on the design product model (50) corresponding to the measurement point;
a display step of displaying a figure representing the shape of the product of the design product model (50) and the magnitude of the deviation on a display unit (26);
a reference adjustment step of adjusting a position of the product coordinate system so that a magnitude of the deviation of the measurement point is reduced;
a deviation information recalculation step of calculating a magnitude of the deviation from a design value in the adjusted product coordinate system; and
a molding die correction step of correcting the molding die so that a position of the product coordinate system on the product becomes a position of the product coordinate system adjusted in the reference adjustment step,
in the reference adjustment step, the product coordinate system is adjusted so that the sum of the magnitudes of the deviations of the measurement points is reduced,
in the reference adjustment step, there are a partial best fit and a total best fit, wherein the partial best fit is a movement amount of the product coordinate system calculated so that a sum of magnitudes of the deviations of the selected measurement points is reduced; the global best fit is a calculation of the amount of movement of the product coordinate system in such a manner that the sum of the magnitudes of the deviations of all the measurement points is reduced, and at the same time, the following values are calculated, that is, the operator selects 1 calculation result from the calculated calculation result group in consideration of the correction method of the molding die, and adjusts the product coordinate system in accordance with the value based on the selected calculation result, based on the value of the movement amount based on the partial best fit, the value of the movement amount based on the entire best fit, the intermediate value between the movement amount based on the partial best fit and the movement amount based on the entire best fit, and the value of the weight of each movement amount changed a plurality of times within the range between the movement amount based on the partial best fit and the movement amount based on the entire best fit.
2. The method of correcting a molding die according to claim 1,
in the reference adjustment step, the operator inputs the amount of parallel movement and the amount of rotational movement about each coordinate axis of the product coordinate system to adjust the amount of movement of the product coordinate system.
3. The method of correcting a molding die according to claim 1,
in the reference adjustment step, an operator inputs a target value of the measurement point at a position of the product defining the product coordinate system among the measurement points, thereby adjusting a movement amount of the product coordinate system.
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| JP2017-025572 | 2017-02-15 | ||
| JP2017025572 | 2017-02-15 | ||
| PCT/JP2018/005257 WO2018151212A1 (en) | 2017-02-15 | 2018-02-15 | Shaping mold correction method and deviation information display method |
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| CN114654623B (en) * | 2020-12-22 | 2023-06-23 | 青岛海信模具有限公司 | Method for correcting reverse deformation of injection mold |
| JP2022157425A (en) * | 2021-03-31 | 2022-10-14 | 富士フイルムビジネスイノベーション株式会社 | Information processing device and information processing program |
| CN113601267B (en) * | 2021-07-26 | 2022-09-20 | 成都飞机工业（集团）有限责任公司 | Method for establishing part machining coordinate system |
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| CN104476109A (en) * | 2014-09-25 | 2015-04-01 | 北京航星机器制造有限公司 | Skin structure accurate positioning machining method |
| JP2016203216A (en) * | 2015-04-23 | 2016-12-08 | トヨタ自動車株式会社 | Correction method of forging die |
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| JP2947367B2 (en) * | 1990-10-25 | 1999-09-13 | 株式会社 ミツトヨ | Inspection drawing display method and device |
| JP4357156B2 (en) * | 2002-06-11 | 2009-11-04 | トヨタ自動車株式会社 | 3D object measurement evaluation system |
| JP2008036889A (en) * | 2006-08-02 | 2008-02-21 | Toyota Motor Corp | Mold correcting method, mold correcting quantity calculation method, mold correcting quantity calculation system and mold correcting quantity calculation program |
| JP2008287468A (en) * | 2007-05-17 | 2008-11-27 | Toyota Motor Corp | Design method for molding die and device and program to be used for the same |
| JP5688253B2 (en) * | 2010-09-08 | 2015-03-25 | 株式会社オプトン | Mold correction method |
| JP6460938B2 (en) * | 2015-07-30 | 2019-01-30 | 株式会社キーエンス | Measurement object measurement program, measurement object measurement method, and magnification observation apparatus |
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| CN104476109A (en) * | 2014-09-25 | 2015-04-01 | 北京航星机器制造有限公司 | Skin structure accurate positioning machining method |
| JP2016203216A (en) * | 2015-04-23 | 2016-12-08 | トヨタ自動車株式会社 | Correction method of forging die |
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