JP3035880B2 - Method and apparatus for designating geometric combination element in coordinate measuring machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate measuring machine provided with position detecting means for movably supporting a probe and detecting the coordinate position of the probe. The present invention relates to a geometric shape combination element designating method for designating a combination element desired from among (symmetrical elements) and an apparatus therefor, and more particularly to a geometric shape combination element designation method and an apparatus therefor in a coordinate measuring machine for measuring a work by manual or joystick operation. .

[0002]

2. Description of the Related Art In a coordinate measuring machine, a probe is movably supported in two dimensions (two-axis directions orthogonal to each other) or three-dimensional (three axes directions orthogonal to each other), and a position detecting means for detecting a coordinate position of the probe is provided. In preparation for each axis, the geometrical shape of the measurement position of the work is calculated from the data of the coordinate position of the probe when the probe comes into contact with the measurement position of the work. Further, if necessary, a geometric shape combination element obtained by combining two geometric shapes is calculated. Geometric shape combination elements include intersection elements and symmetry elements. Intersection elements refer to intersections or lines, and symmetry elements refer to symmetry points (also commonly called midpoints), symmetry lines, and symmetry planes. Say.

FIGS. 10 and 11 show a conventional method and apparatus for designating a combination of geometric shapes. FIG. 10 is a block diagram of the apparatus, and FIG. 11 is a flowchart of the method. FIG.
At 0, the geometric shape calculation unit 12 calculates the geometric shape of the measurement position of the work measured by the coordinate measuring machine 11. The geometric shape storage unit 13 stores the geometric shape calculated by the geometric shape calculation unit 12. The input unit 24 designates two geometric shapes to be subjected to the geometric shape combination element calculation, and designates an intersection element or a symmetric element among the geometric shape combination elements to instruct the calculation. The combination element calculation unit 25 calculates a combination element of two geometric shapes specified from the input unit 31 based on the type of the combination element specified from the input unit 24. The output unit 16 outputs the result calculated by the combination element calculation unit 25.

[0004] In FIG. 11, an operator operates a coordinate measuring machine 11.
When the workpiece is measured by the
2 and the geometric shape of the measurement position of the workpiece is calculated and stored in the geometric shape storage unit 13 (step 9).
1). Next, after two or more geometric shapes are stored in the geometric shape storage unit 13, the operator designates two geometric shapes for calculating a geometric shape combination element from the stored geometric shapes (step 92). , Select the intersection element or the symmetric element among the geometric shape combination elements (step 9)
3). When an intersection element is selected in step 93 and an intersection element is designated from the input unit 24 (step 94), step 9 is performed.
In step 2, the intersection element of the two geometric shapes specified from the input unit 24 is calculated (step 95), and the calculation result is output to the output unit 16 (step 96). When a symmetric element is selected in step 93 and a symmetric element is designated from the input unit 24 (step 97), a symmetric element of two geometric shapes specified from the input unit 24 is calculated in step 92 (step 98). The calculation result is output to the output unit 16 (step 99).

The geometric combination elements calculated and output as described above are all intersections or intersection lines when an intersection element is designated. On the other hand, when a symmetry line or a plane of symmetry is calculated when a symmetric element is specified, two symmetry lines or a plane of symmetry can be calculated. Among the symmetry planes, the closest counterclockwise symmetry line or plane of the specified geometric shape is calculated and output. For example, when two geometric shapes are a line 101 and a line 102 as in the cross section of the part shown in FIG.
03 and 104 are possible, but first the line 101
Is specified, a symmetry line 104 which is the closest counterclockwise to the line 101 is output. When a symmetric element is designated, the intersection 105 is not output.

[0006]

However, in the conventional method, when obtaining a geometric shape combination element, two geometric shapes to be calculated are specified, and the type of the geometric shape combination element is selected and input from a keyboard or the like. There must be. When a symmetrical line or plane is determined, since the symmetrical line or plane to be calculated is determined by the geometrical shape specified first, it is necessary to sufficiently determine which geometrical shape should be specified first. Therefore, there is a problem that the operation is troublesome and time-consuming, and that when selecting a symmetry line or a symmetry plane, a mistake in selecting two symmetry lines or the symmetry plane is likely to occur.

The present invention has been made in view of such circumstances, and has a position detecting means for movably supporting a probe and detecting a coordinate position of the probe. The coordinate for measuring a work manually or by a joystick operation is provided. In a measuring machine, when finding the geometrical shape combination element of the measured workpiece, the work is easy and short, and when finding the symmetry line or plane of symmetry, it is difficult to select two symmetry lines or symmetry planes incorrectly. An object of the present invention is to provide a method and a device for specifying a geometric combination element in a coordinate measuring machine.

[0008]

According to the present invention, in order to achieve the above object, a method of designating a combination element to be determined from combination elements calculated by two geometric shapes is performed by a probe position after measurement. I did it.

That is, a first method and a device for designating a geometrical shape combination element in a coordinate measuring machine include: (a) position detecting means for movably supporting a probe and detecting a coordinate position of the probe; A coordinate measuring machine 11 for measuring a work manually or by a joystick operation; and (b) a geometric shape calculating unit 12 for calculating a geometric shape of a measurement position of the work measured by the coordinate measuring machine 11.
(C) a geometric shape storage unit 13 for storing the calculated geometric shape, (d) an input unit 14 for instructing calculation and selection of the geometric shape combination element, and (e) a geometric shape storage unit 13. A combination element calculation selection unit that calculates a geometric shape combination element from two stored geometric shapes and a geometry previously stored therein and selects a calculation result based on the probe position 11a after measurement. 15 and
(F) An output unit 16 for outputting the result selected by the combination element calculation selection unit 15. Then, the operator measures at least two measurement positions of the work with the coordinate measuring machine 11, the geometric shape of the measured measurement position is calculated by the geometric shape calculation unit 12 and stored in the geometric shape storage unit 13. Next, when the operator moves the probe to the vicinity of the desired geometrical shape combination element to set the probe position 11a, and instructs the input unit 14 to calculate and select the geometrical shape combination element, it is stored in the geometric shape storage unit 13. Of the stored geometric shapes, the latest stored geometric shape and the previously stored geometric shape are called, and the combination element calculation selection unit 15 calculates the combination element of the two geometric shapes. And the set probe position 11a
Is selected based on the calculation result, and the output unit 16 outputs the result. I did it as above.

Further, in the first method, the geometrical shape combination element is calculated and selected by the combination element calculation selection section 15 and is output to the output section 1.
6, the method calculates the intersection element of two geometric shapes, calculates the distance between the calculated intersection element and the probe position 11a to calculate the intersection element distance, and sets the calculated intersection element distance to a predetermined value. If the intersection element distance is smaller than a predetermined value, an intersection element (an intersection element having a smaller intersection element distance) is output, and if the intersection element distance is larger than a predetermined value, two geometric shapes are output. In addition to calculating the symmetric element, the distance between the calculated symmetric element and the probe position 11a is calculated to calculate the symmetric element distance, and the symmetric element having the smaller symmetric element distance is output.

Further, in the second method and its device, the combination element calculation selecting unit 1 described in the first method and its device is used.
The combination element calculation unit 15a that calculates all geometric shape combination elements from the two geometric shapes of the geometric shape most recently stored in the geometric shape storage unit 13 and the geometric shape stored immediately before (a) And (b) a combination element selector for calculating a distance between the calculated combination element and the probe position 11a after the measurement to calculate a combination element distance, and selecting a combination element having the smallest calculated combination element distance. Fifteen
b, a method of calculating, selecting and outputting a geometric shape combination element is described by a combination element calculation unit 15a in which all combination elements of two geometric shapes are calculated, and then a combination element calculation selection unit 15b Then, the distances between all the combination elements and the probe position 11a are calculated, the combination element with the minimum combination element distance is selected, and the output unit 16 outputs the result.

[0013]

According to the first method and apparatus of the present invention, an operator measures at least two measurement positions of a work with a coordinate measuring machine 11 and a geometric shape of the measured measurement positions is calculated by a geometric shape calculation unit 12. After the calculation is performed and stored in the geometric shape storage unit 13, the probe is moved to the vicinity of the geometric shape combination element desired by the operator, the probe position 11 a is set, and the calculation and selection of the geometric shape combination element are performed from the input unit 14. When instructed, the geometrical shape stored in the geometrical shape storage unit 13 is called out, and the two geometrical shapes of the latest stored geometrical shape and the geometrical shape stored immediately before that are called, and the combinational element calculation selecting unit 15 is called. , A combination element of the two geometric shapes is calculated, and a calculation result is selected based on the set probe position 11a, and the output unit 16 outputs the result.

In the combination element calculation calculation selecting section 15,
First, an intersection element of two geometric shapes is calculated, a distance between the calculated intersection element and the probe position 11a is calculated to calculate an intersection element distance, and the calculated intersection element distance is compared with a predetermined value. If the intersection element distance is smaller than a predetermined value, an intersection element (an intersection element having a smaller intersection element distance) is output. If the intersection element distance is larger than a predetermined value, a symmetric element of two geometric shapes is calculated. In addition, the distance between the calculated symmetric element and the probe position 11a is calculated to calculate the symmetric element distance, and the symmetric element having the smaller symmetric element distance is output.

According to the second method and apparatus of the present invention, the first method is used until the workpiece measurement, the calculation of the geometric shape, the storage of the geometric shape, the setting of the probe position, the calculation of the geometrical shape combination element, and the instruction of the selection. And the device, the operator operates the input unit 1
When the calculation and selection of the geometric shape combination element are instructed from No. 4, among the geometric shapes stored in the geometric shape storage unit 13,
The two geometrical shapes of the latest stored geometrical shape and the geometrical shape stored immediately before it are called, and all the combined elements of the two geometrical shapes are calculated by the combinational element calculation unit 15a. The calculation unit 15b calculates the distances between all the combination elements and the probe position 11a, selects the combination element with the minimum combination element distance, and outputs the result from the output unit 16.

[0016]

【Example】

Embodiment 1 FIG. 3 shows a block diagram of Embodiment 1 according to the present invention. FIG.
In the above, the coordinate measuring machine 11 movably supports the probe and includes position detecting means for detecting the coordinate position of the probe, and measures the work manually or by operating a joystick. The geometric shape calculator 12 calculates the geometric shape of the measurement position of the work measured by the coordinate measuring machine 11. The geometric shape storage unit 13 stores the geometric shape calculated by the geometric shape calculation unit 12. The input unit 14 instructs calculation and selection of a geometric shape combination element. When instructed by the input unit 14, the combination element calculation selection unit 15 selects two of the geometric shape stored in the geometric shape storage unit 13, the most recently stored geometric shape and the immediately preceding geometric shape. A geometric shape combination element is calculated from the geometric shape, and a calculation result is selected based on the probe position 11a after the measurement. Output unit 16
Outputs the result selected by the combination element calculation selection unit 15.

FIG. 1 shows a flowchart of a first embodiment according to the present invention. In FIG. 1, when the worker measures a work with the coordinate measuring machine 11, the geometric shape at the measured measurement position is calculated by the geometric shape calculation unit 12 and stored in the geometric shape storage unit 13 (step 61). After two or more geometric shapes are stored in the geometric shape storage unit 13, the probe is moved to the vicinity of the geometric shape combination element required by the operator, and the probe position 11 is set.
When a is set (step 62) and the calculation and selection of the geometric shape combination element are instructed from the input unit 14 (step 63), the geometric shape stored in the geometric shape storage unit 13 among the latest stored geometric shapes is selected. The two geometrical shapes of the shape and the geometrical shape stored immediately before it are called (step 64), and the combinational element calculation selecting unit 15 calculates the combinational element of the two geometrical forms and sets the probe position 11a. Is selected based on the calculation (step 65), and the result is output from the output unit 16 (step 66).

FIG. 2 shows a detailed flowchart of steps 65 and 66 in FIG. In FIG. 2, first, an intersection element of two geometric shapes is calculated (step 71), and the calculated intersection element and the probe position 11 are calculated.
The distance to a is calculated to calculate the intersection element distance (step 72), and the calculated intersection element distance is compared with a predetermined value (step 73), and it is determined that the intersection element distance is smaller than the predetermined value. And the intersection element with the smaller intersection element distance among the intersection elements calculated in step 72 is selected (step 74) and output (step 7).
5). If it is determined in step 73 that the intersection element distance is greater than the predetermined value, two geometrical symmetric elements are calculated (step 76), and the distance between the calculated symmetric element and the probe position 11a is reduced. The calculated symmetric element distance is calculated (step 77), and the symmetric element having the smaller symmetric element distance is selected (step 78) and output (step 79).

Next, a method of calculating and selecting a combination element will be described using a specific example of a geometric shape. In the example shown in FIG. 6, two geometric shapes are a straight line 21 and a straight line 22 like a cross section of a part.
In the case of, since one line is a combination of straight lines, "one intersection" is used as the intersection element, and "two symmetry lines" is used as the symmetric element.
Can be calculated. In this case, the intersection 23 is first obtained, and then the distance La between the probe position 11a (the actual position of the tip of the feeler that comes into contact with the workpiece corresponds to this) and the intersection 23 is calculated. As a result, when the distance La between the probe position 11a and the intersection 23 is smaller than a predetermined value, the intersection 23 is output as it is as a combination element. However, when the distance La between the probe position 11a and the intersection 23 is larger than a predetermined value, Two symmetry lines 24 and 25 are determined and the probe position 11a and the two symmetry lines 24
And 25 distances Ly and Lx are calculated and Lx <Ly
, The symmetry line 25 is selected and output.

The example shown in FIG. 7 is a case where the two geometric shapes are a circle 31 and a circle 32, and the circles 31 and 32 intersect closely. Therefore, "two intersections" are defined as the intersection elements, and the center 31a of the circle 31 and the center 32a of the circle 32 are defined as the symmetric elements.
"One symmetric point" can be calculated. In this case, first the intersection points 33 and 34 are determined, and then the probe positions 11 and
The distances Lb and Lc between a and the intersections 33 and 34 are calculated. As a result, if one of Lb and Lc is smaller than the predetermined value, the intersection (the intersection 33 if Lb <predetermined value in FIG. 7) is output which is smaller than the predetermined value. Is larger than the predetermined value, a symmetric point 35 between the center 31a of the circle 31 and the center 32a of the circle 32 is calculated and output. If Lc is also smaller than a predetermined value, Lc
b and Lc are compared and the smaller one is output.

In the example shown in FIG. 8, the two geometric shapes are a circle 41 and a straight line 42, and the circle 41 and the straight line 42 are close to each other and intersect. Therefore, "two intersections" as intersection elements,
As a symmetric element, “one symmetric point” between a perpendicular leg 42 a descended from the center 41 a of the circle 41 to the straight line 42 and the center 41 a of the circle 41 can be calculated. In this case, the intersections 43 and 44 are obtained first, and then the distances Ld and Le between the probe position 11a and the intersections 43 and 44 are calculated. As a result,
If either Ld or Le is smaller than the predetermined value, the intersection of the smaller of the predetermined values (Ld <predetermined value in FIG.
The intersection point 43) is output, but if both the distances Ld and Le are larger than a predetermined value, the point of symmetry 45 between the perpendicular leg 42a descending from the center 41a of the circle 41 to the straight line 42 and the center 41a of the circle 41 Required and output. If Le is also smaller than the predetermined value, Ld and Le are compared and the smaller one is output.

FIG. 9 shows an example in which the two geometric shapes are a circle 51 and a circle 52. The circles 51 and 52 are separated and do not intersect. Therefore, the intersection element is not calculated, and only "one point of symmetry" between the center 51a of the circle 51 and the center 52a of the circle 52 can be calculated as a symmetric element, and the center 51a of the circle 51 is independent of the probe position 11a. The point of symmetry 53 between the point and the center 52a of the circle 52 is calculated and output.

Second Embodiment FIG. 5 shows a block diagram of a second embodiment according to the present invention. The second embodiment is different from the first embodiment in that the combination element calculation and selection unit 15 shown in the first embodiment is composed of two components: a combination element calculation unit 15a and a combination element selection unit 15b. That is, in the second embodiment, all the combination elements are calculated by the combination element calculation unit 15a, and the combination element selection unit 15b selects them from the calculation results. The other parts are the same as those of the first embodiment, and therefore the same reference numerals are given to the same functional units, and the description will be omitted.

FIG. 4 is a flowchart of a second embodiment according to the present invention. Step 81 to step 84 of the second embodiment
The steps up to this point are the same as steps 61 to 64 of the first embodiment, but are described here in its entirety. In FIG. 4, when the worker measures the work with the coordinate measuring machine 11, the geometric shape of the measured position is measured by the geometric shape calculation unit 1.
2 and stored in the geometric shape storage unit 13 (step 81). After the two or more geometric shapes are stored in the geometric shape storage unit 13, the probe is moved to the vicinity of the geometric shape combination element required by the operator to set the probe position 11a (step 82), and the geometric shape is input from the input unit 14. When calculation and selection of a combination element are instructed (step 83), two of the geometric shapes stored in the geometric shape storage unit 13 are the latest stored geometric shape and the immediately preceding geometric shape. The shape is called (step 84), and all the combination elements of the two geometric shapes are calculated by the combination element calculation unit 15a (step 85). Next, the distances between all the calculated combination elements and the probe position 11a are calculated (step 86), the combination element having the minimum combination element distance is selected (step 87), and the selection result is output from the output unit 16. Is performed (step 88).

[0025]

As described above, when a geometrical shape combination element of a workpiece measured by a coordinate measuring machine is determined, a method for designating a combinational element to be determined from the combinational elements calculated by two geometrical shapes is as follows. It was specified by the probe position after measurement. Therefore, the specifying operation of the combinational element is easy and quick, and the method for specifying the geometrical shape combinational element in the coordinate measuring machine in which the selection error of the two symmetry lines and the symmetry plane hardly occurs even when the symmetry line or the symmetry plane is obtained. The device can be provided.

[Brief description of the drawings]

FIG. 1 is a flowchart of a first embodiment of a geometric shape combination element designation method in a coordinate measuring machine according to the present invention.

FIG. 2 is a detailed flowchart of a combination element calculation selecting step and a combination element output step of FIG. 1;

FIG. 3 is a block diagram of a first embodiment of a geometric shape combination element designating device in the coordinate measuring machine according to the present invention;

FIG. 4 is a flowchart of a second embodiment of a method for designating a geometric shape combination element in a coordinate measuring machine according to the present invention;

FIG. 5 is a block diagram of a second embodiment of the geometric shape combination element specifying device in the coordinate measuring machine according to the present invention;

FIG. 6 is a diagram showing an example of calculation and selection of specific combination elements, in the case of lines and lines;

FIG. 7 is a diagram showing an example of calculation and selection of specific combination elements;

FIG. 8 is a diagram showing an example of calculation and selection of specific combination elements in the case of a circle and a line intersecting

FIG. 9 is a diagram showing an example of calculation and selection of a specific combination element.

FIG. 10 is a flowchart of a method of designating geometric combination elements in a conventional coordinate measuring machine.

FIG. 11 is a block diagram of a geometric shape combination element designating device in a conventional coordinate measuring machine.

FIG. 12 is a diagram showing an example of calculation and selection of specific combination elements in the conventional geometric shape combination element designation method, in the case of lines and lines;

[Explanation of symbols]

 11 Coordinate measuring machine 12 Geometric shape calculation unit 13 Geometric shape storage unit 14 Input unit 15 Combination element calculation selection unit 16 Output unit 61 Geometric shape measurement storage step 62 Probe Position setting step 63 ... Combination element calculation selection instruction step 64 ... Geometric shape calling step 65 ... Combination element calculation selection step 66 ... Combination element output step

Claims (4)

(57) [Claims] 1. A coordinate measuring machine which movably supports a probe and has a position detecting means for detecting a coordinate position of the probe, and which measures a work manually or by operating a joystick. A geometric shape measurement storing step of measuring and measuring two measurement positions and calculating and storing the geometric shape of the measured work position; and a probe position for moving the probe to a position near the desired geometric shape combination element and setting the probe position. A setting step; a combination element calculation selection instructing step of instructing calculation and selection of a geometric shape combination element; and a latest stored geometric shape and a preceding one of the at least two of the stored geometric shapes. A geometric shape calling step for calling two geometric shapes of the set geometric shape; With to calculate the combined element,
A combination element calculation selection step of selecting a calculation result based on the set probe position; and a combination element output step of outputting a result of the combination element calculation selection step. The combination element calculation selection step and the combination element An output step of calculating an intersection element of the two geometric shapes; an intersection element calculation step of calculating a distance between the calculated intersection element and the probe position to calculate an intersection element distance; An intersecting element distance determining step of comparing the calculated intersecting element distance with a predetermined value; and determining that the intersecting element distance of the intersecting elements is smaller than a predetermined value. Selecting the smallest intersection element and outputting the selected intersection element; and determining the intersection element distance. Is greater than a predetermined value, calculate a symmetric element of the two geometric shapes, calculate a distance between the calculated symmetric element and the probe position to calculate a symmetric element distance, and among the symmetric elements, Selecting a symmetrical element having the smallest symmetrical element distance and outputting the selected symmetrical element. A method for specifying a geometrical shape combination element in a coordinate measuring machine, comprising: 2. A coordinate measuring machine which movably supports a probe and has a position detecting means for detecting a coordinate position of the probe, and which measures a work manually or by operating a joystick. A geometric shape measurement storing step of measuring and measuring two measurement positions and calculating and storing the geometric shape of the measured work position; and a probe position for moving the probe to a position near the desired geometric shape combination element and setting the probe position. A setting step; a combination element calculation selection instructing step of instructing calculation and selection of a geometric shape combination element; and a latest stored geometric shape of the at least two stored geometric shapes and a shape stored immediately before the geometric shape. A geometric shape calling step for calling two geometric shapes of the set geometric shape; An all-combination-element calculation step of calculating all of the combination elements; and an all-combination-element distance calculation step of calculating a distance between the calculated all geometric shape combination elements and the probe position to calculate all of the combination element distances. A combination element selection step of selecting a geometric shape combination element having the smallest combination element distance among all of the geometric shape combination elements, and a combination element output step of outputting the selected geometric shape combination element. A method for designating a geometric combination element in a coordinate measuring machine. 3. A coordinate measuring machine which movably supports a probe and has a position detecting means for detecting a coordinate position of the probe, and which measures a work manually or by operating a joystick. A geometric shape calculation unit that calculates a geometric shape at a measurement position; a geometric shape storage unit that stores the calculated geometric shape; an input unit that instructs calculation and selection of a geometric shape combination element; Combination element calculation for calculating a geometric combination element from two geometries of the latest stored geometry and the geometry previously stored, and selecting a calculation result based on the probe position after measurement A selection unit, and an output unit that outputs a result selected and calculated by the combination element calculation selection unit, wherein the combination element calculation selection unit and the output unit Calculating an intersection element of the two geometric shapes, calculating a distance between the calculated intersection element and the probe position to calculate an intersection element distance, and comparing the calculated intersection element distance with a predetermined value. When the result of the determination of the intersection element distance is smaller than a predetermined value, the intersection element having the smallest intersection element distance is selected from the intersection elements, and the selected intersection element is output. When the result of the determination is larger than a predetermined value, the symmetric element of the two geometric shapes is calculated, the distance between the calculated symmetric element and the probe position is calculated to calculate the symmetric element distance, and the symmetric element is calculated. Wherein the symmetric element having the smallest symmetric element distance is selected and the selected symmetric element is output. 4. A coordinate measuring machine for supporting a probe movably and having a position detecting means for detecting a coordinate position of the probe, for measuring a work manually or by operating a joystick, and for measuring a work measured by the coordinate measuring machine. A geometric shape calculation unit that calculates a geometric shape at a measurement position; a geometric shape storage unit that stores the calculated geometric shape; an input unit that instructs calculation and selection of a geometric shape combination element; A combination element calculation unit that calculates all the geometric shape combination elements from the latest stored geometric shape and the geometry stored immediately before the combination; and The distance from the probe position is calculated to calculate all the combination element distances, and the combination element distance is the smallest among the geometric shape combination elements. And combining element selection unit for selecting what shape combination element, geometry combination element designated device in a coordinate measuring machine, characterized in that it is composed of an output unit for outputting the result selected by the combination element selection unit.