JPS60242938A - Indication of deviation of work - Google Patents

Abstract

PURPOSE:To achieve finish of die with necessary accuracy irrespectively of the skill of worker by representing the contour of the deviation of die in press work on the basis of the deviation between the referential data of work and the measured data. CONSTITUTION:Three-dimensional measuring machine 10 has a base 12 to be mounted with a work or a press die 14. Main computer 22 for executing data input control, operational control of three-dimensional measuring machine and display control is provided with CPU24, ROM26 and RAM28. CPU24 is connected to an input device 34 such as keyboard and a color display 36 while furthermore connected to an external memory 38. ROM24 contains a control program of CPU24 for realizing a flowchart to execute data input from the input device 34, measurement of die through said machine 10, display of deviation contour on a color display 36 and painting of contour through said machine 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a technique for finishing a curved surface of a die (workpiece) in press working, and more particularly to a method and apparatus for displaying contour lines of deviation of a die.

BACKGROUND TECHNOLOGY In conventional press die manufacturing, curved surface finishing was performed by combining a model 1 copied from a master (original model) with a workpiece 2 (Figures 2-4). That is, Red Gara is applied on the surface of model 1 facing work 2, and model 1 and work 2
By crimping the blank part 2' of the workpiece 2 (
(Fig. 3), red chia is attached only to the area (Fig. 4). This red shavings adhesion portion 2' is called a red contact portion, and can be regarded as a portion where there is a grinding allowance for the model 1. The skilled worker gradually finishes the red contact portion 2' using a grinding tool, and finally brings it to a state where there is no grinding allowance.

However, this conventional finishing only indicates that the red contact area is relatively sharp compared to other areas, and does not indicate the required amount of grinding as a numerical value. Therefore, the work must depend on the experience and skill of the operator, rather than the shape of the model and the red contact state of the entire workpiece. Therefore, it was difficult to achieve a high-precision finish.

In addition, the worker visually checks the red contact area between the mating model and the workpiece, performs manual finishing using a grinding tool, and sequentially matches the workpiece shape to the reference model shape, so until the work is completed. requires a lot of man-hours.

OBJECTS OF THE INVENTION The present invention has been made in view of the shortcomings of the prior art, and it is an object of the present invention to provide a technique that allows precise mold finishing to be performed quickly and without requiring skill.

Structure of the Invention According to the present invention, standard shape data of a mold to be finished is stored, the shape of the mold is actually measured, a deviation between the standard shape data and the measured data is calculated, and the deviation is classified according to its magnitude. A deviation display method is provided in which contour line data is created and the contour lines are displayed.

FIG. 1 shows the configuration of an apparatus according to the present invention, in which memory means M stores mold reference data. The measuring means S performs actual measurement of the mold. The deviation calculation means calculates the deviation between the reference data and the actual measurement data. The initial value and pitch data of the contour line are inputted from the input means (2), and the contour line data creation means P creates contour line data from these data. The display means T is a video display or a painter and displays contour lines on the surface or on the workpiece.

Embodiment In the fifth leap showing the entire system configuration of the present invention, 1
0 indicates the coordinate measuring machine as a whole, base 12
A press mold 14, which is the workpiece to be measured, is placed on it.
will be installed. There is a carrier 18 on the carriage 16, and a sensing end or vainter is attached via an actuator 19 in a G-replaceable manner as will be described later. Carry Noji 1
6 is perpendicular to the paper, carrier 18 is carrier Fuji 16
Above, in the left and right direction of the figure, axotiment 19 is carrier 1
8 can be independently moved up and down, allowing three-dimensional measurement or painting of the mold.

22 is data input control, three-dimensional measuring machine operation control;
Furthermore, the main computer that controls the display includes a central processing unit (CPU) 24.
, a read-only memory (ROM) 26, and a random access memory (RAM) 28. (:PU
24 is connected to the interface 32 via the line 30,
The interface 32 connects the coordinate measuring machine 10 and the CPU 24.
Controls the exchange of signals between the The CPU 24 includes an input device 34 such as a keyboard, and a color display 3.
6.

The CPU 24 is further connected to an external storage device 38 such as a magnetic disk device. A control program for the CPU 24 that implements the flowchart described later is stored in the ROM 24, and the CPII 24 inputs data from the input device 34 manually and from the coordinate measuring machine 10 according to this control program.
The mold measurement is performed using the color display 36, the contour line display of the deviation is performed using the color display 36, and the contour line painting is performed using the three-dimensional measuring machine IO. In addition to the main computer 22, a subcomputer 40 is provided, which also has a CPU 42, a ROM 4
4, and RAM46. The CPU 42 includes an external storage device 48 such as a magnetic disk device. The CPU 42 of the subcomputer 40 has an interface 50 and a line 5.
2 to the CPU 24 of the main computer 22, making it possible to transfer data between the two computers.

A control program for the CPU 42 is stored in the ROM 44 .

The CPU 42 exchanges data with the main computer 22 according to this program, executes necessary calculations, and stores the results in the external storage device 48 or the interface 50.
, the main computer 2 via the line 52 and the CPU 24.
The data is stored in the external storage device 38 of No. 2.

Next, the principle of contour line display of mold deviation in the present invention will be explained. In the three-dimensional coordinate system in FIG. 6, 200 is a shape (master) that is the prototype of the article to be manufactured. Each point p on this curved surface 200 can be specified by its coordinates X p yp Z, and the curvature of the point p can be specified by each component 1, Jpk of a unit vector (vector perpendicular to the surface) N in the normal direction.

If this article is a part of an automobile, the shape is determined by the appearance of the automobile or the design of the body. In this section, such a design is performed using an electronic computer. In any case, there is master data for press-molding a certain part based on the exterior or body design of the automobile, and this data is stored in a computer.

In FIG. 7, 200 is such a master shape, and 200' is an actual workpiece. Now, standard shape 2
00 and the workpiece shape 200', it is necessary to know the deviation between the two for this comparison.

In the present invention, each point p1, β2°β on the reference shape 200
3... Workpiece shape 200' in the direction perpendicular to the pn
Adopt the idea of comparing with That is, the sensing end 20 provided on the three-dimensional measuring machine is driven along the perpendicular vector N for each point (for example, pl) on the reference data shape 200, and the coordinate (X') of the contact point u1 is determined.

y'+z'). A deviation S1 is calculated from the coordinates of this point u1 and the coordinates of the point p1 on the master shape. For example, the coordinates of the point plnul are root-mean-squared, converted into a scalar as the distance of each point from the origin, and the difference is taken as the deviation. That is, the deviation is 5 ips2,...Sn is 31.2"'n-maX"+7"+2"J72+,'2
4, -2.

In this way, each point p1, 2 on the reference data shape 200
．． . . . For each n, the deviation from the corresponding point u1.2 . . . n on the actual shape 200 in the perpendicular direction is calculated.

The deviations 5IzS2...Sn calculated at each point are classified according to the initial value of the isoline and the pinch, and isoline basic data is created. That is, if equal lines are created in two directions as shown in Figure 8, zl in the figure is the two coordinates that are the initial values of the equal lines, and I! 0°β1,7!2 indicates equal straight lines at a predetermined pitch. It is determined which pitch line each point on the surface of the convex shape 200 is located between, and the data is classified for each data located between certain pitch lines. By connecting this classified data like L, equal straight lines can be obtained. When expanded, this isoline data is actually created by connecting minute line segments as shown in Figure 9: - The intersection point t1 of each line segment.

It is configured as coordinate data of β2...tn.

The contour line data constructed in this manner is displayed by the three-dimensional measuring machine 10 in a different color between each contour line.

The equal straight lines actually displayed on the workpiece will be as shown in Fig. 10.

The isolines are also represented on the color display 36,
The situation will be as shown in Figure 11.

Having explained the principle of contour line display of mold deviation in the present invention, the software of the present invention will be explained below in accordance with the flowchart.

FIG. 12 schematically shows a reference data output and input routine, and when a predetermined manual command is input from the input device 34, master data is transferred from the subcomputer 40 to the main computer 22. That is, as already explained in FIG. 6, the reference data includes, for each point p1.2...n on the curved surface 200 formed by the data, its coordinate value 0'p3'+Z) and the surface perpendicular vector. Component value of N (1p
J 7 k), and such coordinate values and component values of the surface perpendicular vector are combined and stored in the storage area 48a for all points. When there is an input command, the CPU 24 starts from 300 in FIG.
j issues a master data output permission command to the interface 50 (step 301). Then, the CPU 24j of the subcomputer executes the interrupt routine shown in FIG.
Start from Then, in step 401, the CPU 24j writes 1 byte of reference data to the interface 50. When the writing is completed, a data read permission command is sent to the interface 50 in 402. When this data read permission command is received, the main computer 22
, PU24 starts the routine of FIG. 14 at 500, and
In step 502, the PU 24 connects the interface 50
The reference data written in is read and stored in RAM 2B. When the reading is completed, the CPU 2
'4 issues a reference data output permission command to the interface 50. Then, the routine shown in FIG. 13 starts again and outputs the next byte of the reference data.

In this way, the main computer 22 and the secondary computer 40
When data output is completed for all points while exchanging reference data with , the determination at 506 in FIG. The data is transferred to the area 38a of the device 38.

FIG. 15 shows a measurement routine for a press die, which is a workpiece. As already explained with reference to FIG. 6, the workpiece is measured at each point pt in the reference data.

2...n over all points in the direction perpendicular to the surface. When this measurement command is input, the routine starts from 600 in Fig. 15, and in 602, the coordinate values (Xzy, Z) at a certain point on the reference data (for example, pl in Fig. 7) are calculated.
And the component value (' n J p k) of the plane perpendicular vector N is taken in. In the next step 604, a measurement operating point is calculated. That is, the sensing end 20 of the three-dimensional measuring machine is once lowered from point q1 to point q2 on the surface normal vector N at the selected point p1 of the mask shape, and then automatically moves to a point q3 inside the master shape 200 in the direction of the surface normal vector. After contacting the convex shape 200 (point u1), it moves up to the measurement preparation point q4 of the next point, thereby completing the measurement of one point p1 on the press die, which is the object to be measured. A series of sensing ends 2 like this
0 operating points (HQ2, Q3, Q4) are calculated in 604 steps.

In 606, the operating point Ql −Q2− calculated in 604 is
93 A command to move the sensing end 20 in the order of Q4 is sent to the coordinate measuring machine 10 via the interface 31. When this command is issued, the three-dimensional measuring machine 10 moves the detection end 20 as described above, reaches the final point q4, and stops. When the sensing end comes to the point ul in Fig. 7, that is,
When it comes into contact with the press mold, the determination at 608 in FIG. 15 is Yes.
s, and at 610 the coordinates of the press mold at that time (X'p
V'pz') is read as data. In step 612, the CPU 24 stores the read data in the external storage device 3.
8 is stored in the second storage area 38b. In step 614, all points pt of the mask shape (200 in FIG. 7) are extracted.

2...n (X p 3' J Z), the contact point (X' p Y'
It is determined whether the measurement of pz') has been completed, and if YES, this routine ends at 616.

Let's move on to the explanation of the routine for calculating isoline basic data. Calculation of the isoline basic data is performed by calculating the deviation between the standard data shape and the actually measured shape of the workpiece, and the subcomputer 40 performs this calculation.

In advance, the reference data is stored in the storage area 48a of the external storage device 48 as described above, and the actual measurement data from the storage area 38a of the main computer 22 is stored in the storage area 48b. From the main computer 22 to the sub computer 4
Since the transfer of measurement data to 0 is substantially the same as the transfer of mask data from the subcomputer 40 to the main computer 22 in FIGS. 12-14, a detailed explanation thereof will be omitted.

When a start-up command is received from the human-powered device, the CPII 24 of the main computer 22 starts executing the routine at 700 in FIG. z1 is...
The equal straight line pitch is input from the keyboard 34. 70
In step 4, a read permission command for these input data is written to the interface 50. Then, the CPU 42 of the subcomputer 40 opens the interrupt routine shown in FIG. be done.

At 804, for each point p1, 2...n of the master shape, the actual measurement point 1 in the plane normal vector direction of the workpiece shape is determined.
．． 2 . Next, in 807, the difference data is classified from the initial value 21 contour line pitch k for isoline calculation. That is, assuming that equal straight lines are created in two directions as shown in FIG. 8, and βOp'jβ2 are equal straight lines for each pitch, data included between each of these lines is collected. Data is smoothed for each classification using a method such as the least squares method, and equilinear basic data such as L is obtained (80B). This contour line data is constructed as coordinate value data for each minutely spaced point tljt2...tn constituting one isoline (FIG. 9). When sorting is performed for all groups, a determination of Yes is made in 809, and this processing is completed.

The equilinear basic data thus calculated is received by the main computer 22 through the interface 50 and written into the storage area 38b of the external storage device 38.

The method of transmitting data from the subcomputer to the main computer is the same as that shown in FIGS. 12-14, and the explanation thereof will be omitted.

Next, the deviation display routine will be explained with reference to FIG. 18. When the command is input from the keyboard 34 at 900, this routine starts to be executed. At 902, the outline data of the workpiece is read from the contour data storage area 38b and the outline of the workpiece is displayed on the display 36. That is, each point on the screen of the display 3G is RAM.
There is a one-to-one correspondence with the 28 areas, and by setting a predetermined value to the RAM address corresponding to each point on the outline of the work, the shape can be displayed on the screen. Next, in step 904, the equal straight lines are displayed in color. That is, depending on which contour lines each point on the screen is located between, predetermined color data is transferred to each address in the RAM color area. The color of each point on the screen of the color display has a one-to-one correspondence with the color area of the RAM, and by setting data corresponding to the color in that area, a predetermined color can be displayed. Therefore, a shape line can be projected on a color display, and deviations can be expressed using equal straight lines according to their magnitudes. An example of such a display is shown in FIG.

Figure 19 shows NC for painting equal straight lines on the workpiece.
The data creation routine is shown. When a command for this purpose is input from the keyboard 36, the routine begins execution at step 1000, and at 1002, the coordinates of the paint start point (for example, SO in FIG. 8 is the paint start point) are input, and at 1004, The basic equilinear data in the storage area 38b of the external storage device 38 is read and stored in the RAM.
It is stored in 2B.

At 1006, the CPU 24 calculates NC information for isoline painting. Therefore, in Fig. 9, for the first point t1, calculate the amount of movement from the painting start point So to the first point t1 of the isolinear basic data, and for the second point t2 and subsequent points, calculate the amount of movement from the painting start point So to the first point t1 of the equilinear basic data. The amount of movement from is calculated as NC information. The NC information calculated in this manner is stored in the storage area 38b of the external storage device 38.

FIG. 20 shows the routine for isoline painting. 1
When a paint command is given from the input device 36 at 100, the CPII 24 sequentially reads out the equal straight line paint NG information stored in the storage area 38b of the external storage device W38 (1102). In the next step 1104, CPU2
4 transmits the read information to the coordinate measuring machine 10 via the interface 32. A paint device is attached to the three-dimensional measuring machine 10 in place of the measuring end, and isolinear painting processing is performed on the surface of the workpiece based on the transmitted NC information. This is NG information storage w4 area 38
This process is continued until there is no more NC information stored in b.

The state of the painted workpiece is shown in FIG.

After the contour line display of the deviation of the workpiece is completed, the operator performs the grinding operation according to the color while looking at the color of the paint on the workpiece and the color on the color display.

After grinding, the above-described contouring process is repeated until the deviation is within an acceptable range.

Effects of the Invention Since equal straight lines are created and displayed based on the deviation between the reference shape data of the workpiece and the actual measurement data, the operator can immediately know the required amount of grinding according to the displayed color.

Therefore, regardless of the skill level of the operator, the mold can be finished with the necessary precision in a short time.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of the present invention, FIGS. 2 to 4 are schematic perspective views explaining a conventional finishing method, FIG. 5 is a schematic diagram of a computer system in an embodiment of the present invention, and FIG. 6 is a diagram explaining the structure of standard data, FIG. 7 is a diagram showing the principle of measuring a workpiece, FIG. 8 is a diagram showing the principle of displaying isolines, and FIG. 9 is a diagram explaining the structure of basic isoline data. 10th
The figure is an example of the isoline painting result, FIG. 11 is an example of the isoline display result, and FIGS. 12 to 20 are flowcharts explaining the software configuration of the present invention. 10... Three-dimensional measuring machine, ]4... Work (press type), 22... Main computer, 34... Keyboard, 36... Color display, 38... External storage device, 40...・Secondary computer,
48...External storage device. Figure 1 Figure 6 Z Figure 7

Claims (1)

[Claims] 1. Storing reference shape data of a workpiece to be finished, actually measuring the shape of the workpiece, calculating deviations between the reference shape data and the actual measurement data, and classifying the deviations according to their magnitudes. A workpiece deviation display method that creates contour line data and displays the contour lines. 2. A workpiece deviation display device consisting of the following elements: (a) A memory means for storing the reference data of the workpiece; (2) A means for actually measuring the workpiece and measuring its shape data; (c) Reference data and actual measurement data 2. Means for inputting initial value and pitch data for contour line calculation; 5. Means for sorting from the initial value and pitch based on the above deviation to create contour line data; 2. Contour line data means for displaying contour lines according to