JPS63285615A - Off-line teaching device for three-dimensional measuring instrument - Google Patents

Abstract

PURPOSE:To obtain an off-line teaching device simpler in operation than the conventional by using a means which decides the drawing data from a designated accuracy name. CONSTITUTION:An accuracy name is designated by an accuracy name designating means 40 and a measuring element is designated by a measuring element designating means 41 in response to said accuracy name. Thus a specific area to be measured is designated for a subject. Then a deciding means 42 decides from the designated accuracy name whether the drawing data belongs to a 1st group where the drawing data can be treated as the space coordinate data, a 2nd group where the drawing data is handled as the projection coordinate data, or a 3rd group where it is impossible to decide unconditionally whether the drawing data should by handles as the space coordinate data or the projection coordinate data. Thus an automatic off-line teaching action is possible to the measuring path of a 3-dimensional measuring instrument just with designation of the accuracy name and the measuring element.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an offline teaching device for a three-dimensional measuring machine that can perform efficient teaching using CAD data used when designing a part.

[Conventional technology]

Compared to conventional manual machines, the 3D measuring machine uses an NC system that uses a teaching playback method.
Measurement efficiency has been significantly improved.

As is well-known, the teaching playback method is a method in which a measurement point is determined while moving the probe of a three-dimensional measuring machine for the first object among multiple objects to be measured, and the measurement operation is memorized. (This is referred to as teaching).Then, by repeatedly calling up the teaching data, the measurement work becomes more efficient.

By the way, as mentioned above, in so-called online teaching, in which students learn measurement operations while moving the probe of a three-dimensional measuring machine, 1. During teaching, there is not only the problem that the 3D measuring machine is occupied for teaching and the original measurement cannot be performed, but also the problem that teaching requires a lot of time. .

Therefore, offline teaching has been proposed that allows for efficient teaching using the CAD data used when designing parts (for example, "Machinist VOL, 3
1 Nα3 pages 50-53). This is a plan view input means (general-purpose two-dimensional C
(3D processing) means (computer) for creating geometric data (this becomes a shape model of the object) by giving height information to the plan view created by the plan view input means and making it into a three-dimensional shape; The apparatus includes measurement path determining means and measurement path display means for instructing on the screen to measure the shape model of the object created by the three-dimensional processing means and determining the measurement path.

In order to determine the measurement path, the operator is required to perform the following operations.

■ Click (designate) the desired measurement item (flatness, roundness, groove width, dimension between elements, etc.) from the measurement item menu in the menu area displayed on the screen.

■ Hit the element (mainly surface) you want to measure.

■Enter the number of measurement points.

■Instruct the number of measurement points.

■Set measurement specifications (probe dimensions, feeler dimensions, etc.).

0 Set the measurement reference plane, reference axis, and origin of the test object on the screen.

The measurement path determining means determines a measurement path based on the data inputted through the above-mentioned operations 1 to 2, and causes the measurement path display means to display the determined measurement path.

In addition, when a measurement point is set at a position where the probe and the object to be measured interfere with each other in (■) above, there is an interference check function that blinks the corresponding measurement point to prompt the operator to reset it, and the addition of a measurement point. Deletion and deletion functions are added.

[Problem that the invention seeks to solve]

In the conventional techniques as described above, the operator is required to perform many operations in order to determine the measurement path. Therefore, it is an object of the present invention to provide an offline teaching device that is easier to operate.

(Summary of the Invention) The present invention provides an apparatus for off-line teaching of a three-dimensional measuring machine based on the storage contents of a data storage means for storing drawing data. A measuring element specifying means to be specified, and whether the specified measuring element is from a first group that can treat the drawing data as spatial coordinate data or a second group that can treat the drawing data as projected coordinate data, and the drawing data. a determination means for determining whether the specified measurement element can be treated as spatial coordinate data or projected coordinate data or belongs to an unknown third group based on the specified accuracy name; reads the three-dimensional data of the specified measurement element from the data storage means, and calculates the number of measurement points and measurement positions based on the measurement item determined from the specified accuracy name.
If the specified measurement element is in a second group, the calculation means reads the three-dimensional data of the specified measurement element from the data storage means and converts it into two-dimensional data projected on a predetermined projection plane. a second calculation means for calculating the number of measurement points and measurement positions based on the measurement items determined from the specified accuracy basis; and if the specified measurement element is in the third group, the specified measurement element; The three-dimensional data of is read from the data storage means, and it is determined whether the element is treated as a surface, a straight line, or a point based on the area, length, and width of the element, and the measurement items determined based on the specified accuracy criteria are determined. a third calculation means for calculating the number of measurement points and a measurement position based on the above, and the calculation results of the first calculation means, the second calculation means, and the third calculation means are manually calculated, and the measurement path of the probe of the three-dimensional measuring machine is determined. measurement path storage means for determining and storing the
This is an offline teaching device for a three-dimensional measuring machine characterized by having the following.

(Example) The present invention will be described below based on the example shown in the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

In CADI, which has a plan view input function and a three-dimensional processing function, drawing data is input using a keyboard. The first storage means 2 stores the three-dimensional shape of the object processed by CADl.

The precision name foot means 40 is for specifying the precision base on the drawing using a keyboard or the like.

Accuracy is classified into geometric deviation, dimensional tolerance, and angular tolerance, and specific accuracy bases include, for example, flatness, cylindricity, roundness, and dimension. The measurement element specifying means 41 specifies which part of the test object is to be measured, and the three-dimensional shape of the test object displayed on the graphic display 3 according to the stored contents of the first storage means 2. While looking at the table, the measurement target is designated on the graphic display 3 using a tablet (accuracy name finger/toe means 40 and measurement element designation means 41).
are included in the input means 400, and the input means 400 stores the accuracy basis and the measurement element in correspondence, and sequentially selects the judgment means 42, the calculation means 43, 44, .
45. The determining means 42 is an accuracy measuring means 40.
Based on the precision basis specified in , whether the measurement element specified by the measurement element specification means 41 is from the first group in which the drawing data stored in the first storage means 2 can be treated as spatial coordinate data; Whether the drawing data stored in the first storage means 2 belongs to the second group that can be handled as projected coordinate data, or whether the drawing data stored in the first storage means 2 can be handled as spatial coordinate data or projected coordinate data. Determine if it belongs to the unknown third group.

When the determining means 42 determines that the specified measuring element belongs to the first group, the first calculating means 43 reads the three-dimensional data of the element specified by the measuring element specifying means 41 from the first storage means 2, and The number of measurement points and measurement positions are calculated based on the measurement items determined from the specified accuracy criteria. That is, the first calculation means 43 has a measurement item determination means and a measurement point number and measurement position determination means. In addition,
For example, if flatness is given as an accuracy basis, the measurement item determining means determines a corresponding measurement item (in this case, a surface). More specifically, a figure read out as three-dimensional data is cut into meshes (this method is well known in the field of image analysis as a means of figure recognition), and for example, if the figure is a plane, To do this, check for interference between the probe and the object, and measure the three points in the figure where the area covered by the three measurement points is maximum. Furthermore, when multi-point measurement is required, such as in the case of flatness measurement, the number of measurement points and the coordinates of the measurement points are determined with a fineness corresponding to the surface accuracy of the drawing data in the first storage means 2. .

The coordinates of the measurement point calculated by the first calculation means 43 are stored in the second storage means 46.

When the determination means 42 determines that the specified measurement element belongs to the second group, the second calculation means 44 reads the three-dimensional data of the element specified by the measurement element specification means 41 from the first storage means 2, and The number of measurement points and measurement positions are calculated based on the measurement items determined from the specified accuracy criteria. In other words, if, for example, roundness is given as the accuracy basis, the measurement item determining means selects the corresponding measurement item (
yen). Next, the projection plane determining means determines the most suitable projection plane for measuring the measurement element. Specifically, when measuring the roundness of a hole, for example, the widest plane perpendicular to the axis of the hole is selected from the drawing data and used as the projection plane.

Then, the measurement point number and measurement position determining means determines the coordinates of the measurement points. In this way, the second calculation means 44 includes a measurement item determination means, a projection plane determination means, and a measurement point and measurement position determination means. In this way, the second calculation means 4
The coordinates of the measurement point calculated in step 4 are also stored in the second storage means 46.

When the determining means 42 determines that the specified measuring element belongs to the third group, the third calculating means 45 reads the three-dimensional data of the element specified by the measuring element specifying means 41 from the first storage means 2, and The number of measurement points and measurement positions are calculated based on the measurement items determined from the specified accuracy name. Specifically, the measurement item determining means of the third calculation means determines the measurement item of the three-dimensional measuring machine from the accuracy name and the measurement element. For example, in the case of the distance between planes, if both planes can be treated as planes, the measurement item is determined as the distance between planes, and if both can be treated as straight lines, the measurement item is determined as the distance between straight lines. That is, in the case of a plane, the figure read out as three-dimensional data is cut into a mesh, and the area, length, and width are inspected, taking into account interference between the probe and the object. When the area, length, and width are each greater than or equal to the first predetermined values, it is determined that this figure can be treated as a plane on three-dimensional coordinates, and the means for determining the number of measurement points and measurement positions is executed. For example, the coordinates of three points having the maximum area within the figure are determined as measurement points. On the other hand, if the above-mentioned area, length, and width are smaller than the corresponding first predetermined values and greater than or equal to the second predetermined values smaller than the first predetermined values, this figure is 3 It is determined that it is better to treat the element as a straight line on three-dimensional coordinates than as a plane on dimensional coordinates, and the projection plane determining means determines the optimal projection plane for measuring the element, and determines the number of measurement points and the measurement position. The determining means determines the coordinates of two points that are the maximum distance between the projected straight lines as measurement points. Further, if the above-mentioned area, length, and width are smaller than the corresponding second predetermined values, it is treated as a point and its coordinates are determined.

Similarly, in the case of a cylindrical surface, for example, the cylindrical surface is cut into a mesh and inspected in the same way as for a flat surface, to find the coordinates of two circles that have the maximum span in the axial direction. If the span is greater than a certain value, it is treated as a cylindrical surface, and if it is smaller, it is treated as a circle.

The coordinates of the measurement point calculated by the third calculation means 44 in this manner are also stored in the second storage means 46.

The measurement path determining means 47 determines a measurement path from the coordinate values of the measurement points stored in the second storage means 46, stores it, and displays it on the display 3 together with the three-dimensional shape of the object.

The output means 48 outputs the output signal of the measurement path determination means 47 to three
As a result, the probe of the three-dimensional measuring machine 6 moves according to the measurement bus determined by the measurement bus determination means 47.

Note that the accuracy name toe/toe means 40, measurement element designation means 41, judgment means 42, first calculation means 43, second calculation means 44, third calculation means 45, second storage means 46, measurement bus determination means explained above 47, the output means 48 constitutes the offline teaching device main body 4.

Hereinafter, the operation shown in FIG. 1 will be explained based on FIG. 2, which is a flowchart of offline teaching.

First, input drawing data into CADI (step 20)
). There is no need to input this drawing data manually during offline teaching (if the data of the object to be inspected is already included as a result of design work using CADl (usually it is already included), this input is not necessary. Just call it (
Step 20). Next, the accuracy name is designated by the accuracy name finger foot means 40 (step 21), and the measurement element designation means 41
The measurement element is specified in correspondence with the accuracy name (step 22). This specifies where on the object to be measured. The input means 400 determines whether or not the specification of accuracy name and measurement element has been completed (step 23). When the instruction to finish is given, the input means 400 assigns an order to the specified combination of accuracy name and measurement element, and returns N- 1 (step 24). The determining means 42 determines from the accuracy name specified by the specifying means 40,
Whether it is the first group that allows drawing data to be treated as spatial coordinate data, or the second group that treats drawing data as projected coordinate data, or whether drawing data is treated as spatial coordinate data or projected coordinate data. It is determined whether the data belongs to the unspecified third group (step 25). - When the designated accuracy name is determined by the determination means 42 to be of the first group, the first calculation means 43 stores the spatial coordinate data of the measurement element designated by the measurement element designation means 41 in the first storage means 2. The number of measurement points and the coordinates of the measurement points are calculated and stored in the second storage means 46 (step 26). In addition, if the specified accuracy name is determined by the determination means to belong to the second group, the second
The calculating means 44 reads the spatial coordinate data of the measuring element specified by the measuring element specifying means 41 from the first storage means 2, performs the above-mentioned calculations, calculates the number of measuring points and the coordinates of the measuring points, and calculates the number of measuring points and the coordinates of the measuring points. It is stored in the storage means 46 (step 27). Further, when the designated accuracy name is determined by the determining means 42 to be of the third group, the third calculating means 45 stores the spatial coordinate data of the measuring element specified by the measuring element specifying means 41 in the first storage means. Called from 2,
First, determine whether this measurement element can be treated as spatial coordinate data or projected coordinate data.
), based on this determination, the number of measurement points and the coordinates of the measurement points are calculated and stored in the second storage means 46 (step 29
).

When steps 26, 27, and 29 are completed, it is determined whether all the specified accuracy name and measurement element pairs have been calculated (step 30), and if not, the next pair is calculated (step 30). 31.25.26.27.28.
29) If the measurement path has been completed, the measurement path determination means 47 determines the measurement path and displays it on the display 3 (
Step 32).

Then, it is determined whether there is an output command or not (step 3
3) If there is an output command, a measurement path determination signal is sent to the three-dimensional controller 5 (step 34).

Note that it is preferable that the remaining portion of the offline teaching device 4 except for a command member such as a keyboard be configured by a computer.

(Effects of the Invention) As described above, according to the present invention, the measurement path of the 3D measuring machine can be taught automatically and off-line by simply specifying the accuracy name and measurement element, making it extremely easy to use. An offline teaching device can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of the embodiment of FIG. (Explanation of symbols of main parts) 4...Offline teaching device 40...Accuracy name specifying means 41...Measurement element specifying means 42...Judgment means 43...First calculation means 44...No. 2 calculation means 45...Third calculation means 47...Measurement path determination means 400...Input means

Claims (1)

[Scope of Claims] An apparatus for offline teaching of a three-dimensional measuring machine based on the contents stored in a data storage means for storing drawing data, comprising: an accuracy name designation means for designating an accuracy name; and a measurement element for designating a measurement element. specifying means; determining whether the specified measurement element is from a first group that can treat the drawing data as spatial coordinate data or a second group that can treat the drawing data as projected coordinate data; determining means for determining whether the specified measurement element is of a third group of unknown whether it can be treated as data or projected coordinate data, based on the specified accuracy name; a first calculation means for reading three-dimensional data of a specified measurement element from the data storage means and calculating the number of measurement points and measurement positions based on the measurement item determined from the specified accuracy name; If the element is in the second group, the three-dimensional data of the specified measurement element is read from the data storage means, converted into two-dimensional data projected on a predetermined projection plane, and then converted from the specified accuracy name. a second calculation means that calculates the number of measurement points and measurement positions based on the determined measurement items; and when the designated measurement element is in a third group, the data storage means stores the three-dimensional data of the designated measurement element; , determine whether the element is treated as a surface, straight line, or point based on the area, length, and width of the element, and calculate the number of measurement points and measurement position based on the measurement item determined from the specified accuracy name. and a measurement path for inputting the calculation results of the first calculation means, the second calculation means, and the third calculation means, and determining and storing the measurement path of the probe of the three-dimensional measuring machine. An offline teaching device for a three-dimensional measuring machine, comprising: a storage means;