JPH06347231A - Size inspecting system - Google Patents

Abstract

PURPOSE:To inspect the sizes of parts having all kinds of shapes precisely with small man-hours and to control a machining apparatus automatically in response to the result of the inspection. CONSTITUTION:In a processing device, the distance (measured size L') between the intersections of machining surfaces S1' and S2' corresponding to base points P1 and P2 and a straight line SV' passing the base points P1 and P2 is computed from the drawing data read out of a memory device and the measured data outputted from a measuring device. The size error between the measured size L' and a reference size L is computed. Machining errors DELTAX and DELTAY in the machining coordinate system are computed from the relationship between preset size measuring surfaces S2 and S3 and the machining surfaces S2' and S3'. The correcting amounts for offsetting the machining errors are added to the size command. Thus, the size error becomes small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dimension inspection system for inspecting the three-dimensional dimensions of machined parts.

[0002]

2. Description of the Related Art As is well known, blades and the like used in turbines of jet engines have CAD (Computer).
Based on the design drawing created by the Aided Design system, etc.
Dimensionally processed into finished parts. This type of processing is called compound processing, and the part is processed so that the actual size (hereinafter referred to as the measured size) matches the reference size shown in the design drawing. When the quality manager confirms that the finished parts that have been processed have the dimensions of each part measured by a measuring device and the error between the measured dimensions and the reference dimensions exceeds the allowable range (hereinafter referred to as tolerance), It is considered defective. When the grinding wheel mounted on the processing device is worn and the error between the measured size and the reference size exceeds the tolerance, the quality manager controls the processing device so that the error in the measured size is small.

[0003]

As described above, in the conventional composite machining process, the quality of the completed part is judged by comparing the measured size with the reference size. In this comparison (hereinafter referred to as inspection work), the quality manager (human) enters the measurement dimension on the check sheet etc. for each measurement of each part of the finished part, and the dimension error of the reference dimension corresponding to the measurement dimension It is done by evaluating whether it is within the tolerance.

As described above, since the inspection work of the completed parts is performed manually, there is a problem that it takes time and labor of the inspection work increases. There is also a problem that human error such as erroneous writing on the check sheet is likely to occur. Furthermore, there is a problem that the inspection result is used only for determining the quality of the finished part, and the inspection result for the finished part which is determined to be a non-defective product is not reflected in the next part processing.

The present invention has been made in view of such a background, and it is possible to precisely inspect the dimensions of parts of any shape with a small number of man-hours, and to automatically control the processing device according to the inspection result. It is an object of the present invention to provide a dimension inspection system capable of

[0006]

A dimensional inspection system according to the present invention is a dimensional inspection system for inspecting the dimensions of a component composed of a plurality of machined surfaces, which comprises position information of a pair of base points and the first of the components. Storage means for storing drawing data having information on one reference surface; and a preset second
Measuring means for measuring the position of the processing surface corresponding to the reference surface of, and the measurement dimension the distance between the intersection of the processing surface corresponding to the pair of base points and a straight line passing through the pair of base points, The dimensional error between the reference dimension, which is the distance between the base points, and the measured dimension is calculated, and the deviation amount in the machining coordinate system is calculated from the positional relationship between the second reference surface and the machining surface, and the deviation amount is calculated. It is characterized by comprising an inspection means for adding a correction amount for canceling out to a dimension command based on the drawing data, and a processing device for processing the component into a predetermined shape based on the dimension command.

[0007]

According to the above construction, first, in the inspection means,
Based on the drawing data read from the storage means and the position information of the machining surface measured by the measuring means, the distance between the intersections of the machining surface corresponding to the pair of base points and the straight line passing through the pair of base points ( The measurement dimension) is calculated, and the dimension error between this measurement dimension and the reference dimension, which is the distance between the base points, is calculated. Further, a deviation amount in a coordinate system corresponding to the machining direction is calculated from a positional relationship between a preset second reference surface and the machining surface, and a correction amount for canceling the deviation amount is converted into a dimension command based on the drawing data. Is added. And the parts are
It is processed into a predetermined shape by the processing device based on the dimension command. Thus, the components of all shapes are precisely inspected with a small number of steps, and the processing apparatus is automatically controlled according to the inspection result.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a combined machining line to which a dimension inspection system according to an embodiment of the present invention is applied. In the processing line shown in this figure, a plurality of parts are sequentially conveyed by a conveyor and processed into a predetermined shape.

In this figure, 1a is a part machined into a predetermined shape, and 2 is a processing device for grinding the part 1a based on a dimension command sent from a processing device 5 which will be described later. Have. Reference numeral 3 denotes a measuring device that operates in response to a control signal sent from a processing device 5 described later, and is a component (completed component) placed on a measuring bench (not shown).
The three-dimensional shape of 1b is measured, and the measurement data obtained by this is sent to the processor 5.

The measuring device 3 comprises a transducer 3a and a touch sensor 3b as measuring means. The transducer 3a has a tip portion T as shown in FIG.
1 measures the distance d from the reference position to the position in contact with the object to be measured (component 1b), and the touch sensor 3b
2 is for measuring the coordinates (x, y, z) of the point p at which the tip T2 contacts the object to be measured, as shown in FIG. The coordinates (x, y, z) are the coordinates of the point p in the coordinate system created by the processing device 5.

Further, in FIG. 1, reference numeral 4 denotes parts 1a and 1b.
Is a conveyor laid so that the processing device 2 and the measuring device 3 are conveyed in this order. The processing unit 5 performs various arithmetic processes and controls each component, and includes a CPU (not shown),
It is composed of ROM, RAM and various I / O interfaces. The processing device 5 performs various processes by executing a program stored in the ROM in the CPU, and its operation will be described later.

A storage device 6 is connected to the processing device 5 and stores drawing data created by a CAD system or the like. A display device 7 such as a display connected to the processing device 5 displays various processing results. An input device 8 such as a keyboard sends an instruction signal corresponding to the input instruction to the processing device 5. The instruction signal includes information for designating drawing data corresponding to the part to be processed.

Next, the operation of the dimension inspection system having the above-mentioned structure will be described with reference to FIGS. FIG. 3 shows the processing device 5.
5 is a flowchart showing the flow of processing performed by the processing device 5. As shown in this figure, the processing device 5 operates while the processing line is operating. In addition, here, the processing apparatus 2 is shown in FIG.
It shall operate based on the dimensional command corresponding to the drawing data of the parts of the shape shown in.

First, before starting the operation of the processing line,
When a predetermined instruction signal is sent via the input device 8, the processing device 5 executes step S1 shown in FIG. In step S1, a drawing coordinate system (X, Y, Z) is created and drawing data designated by an instruction signal sent from the input device 8 is read from the storage device 6. And FIG.
As shown in (b), a surface model (reference surface model) is created on the drawing coordinate system (X, Y, Z) from the drawing data. Then, the measuring device 3 measures the finished part processed to the standard dimensions.
Then, the mounting surface of the finished part and the corresponding surface (first reference surface) of the reference surface model are aligned with each other.

The reference plane model created here is the dimension measurement planes S1 and S2, the dimension measurement plane vectors V1 and V2 which are normal vectors of the dimension measurement planes, the dimension line vector SV indicating the measurement direction of the reference dimension, It has base points P1 and P2 of reference dimensions. Further, the processing device 5 measures the positions of the base points P1 and P2 so as to measure the positions on the component 1b corresponding to the base points P1 and P2.
A control signal corresponding to the coordinates of P2 is sent to the measuring device 3.

Next, in step S2, the operating state of the processing line is determined. Here, if the processing line is stopped, the process ends, and if it is operating, the process proceeds to step S3. In step S3, when the measurement data about the component 1b is sent from the measurement device 3, the deviation amounts (distances) D1 and D2 in the directions that match the dimension measurement plane vectors V1 and V2 are calculated based on the measurement data, and the deviations are calculated. Amount D
Based on 1 and D2, machined surfaces S1 'and S2' corresponding to the dimension measurement surfaces S1 and S2 are created on the drawing coordinate system (X, Y, Z). That is, the machined surface model shown in FIG. 4C is created. The format of the measurement data differs depending on the measuring means. For example, as shown in FIG. 4C, the transducer 3a has a distance D2 in the direction corresponding to the dimension measurement plane vector V2, and the touch sensor 3b has a contact point P1 ″ in the drawing coordinate system (X, Y, Z). Coordinates (x1,
Let y1, z1) be the measurement data.

Next, in step S4, a dimension (measurement dimension) of a predetermined portion is calculated from the created machined surface model. This calculation is, as shown in FIG. 5A, an intersection point P1 of a straight line SV ′ passing through the above-described two base points P1 and P2 and parallel to the dimension line vector SV, and two processing surfaces S1 ′ and S2 ′. The coordinates of ', P2' are obtained, and the distance (measurement dimension L ') between the intersection points P1', P2 'is calculated.

Next, when the process proceeds to step S5, step S
Dimensional error between the measured dimension L ′ calculated in 4 and the corresponding reference dimension L is calculated. If this dimensional error exceeds the tolerance, an output signal indicating that the product is defective is sent to the display device 7. If the dimensional error is equal to or smaller than the tolerance, the output signal becomes a signal indicating that the product is non-defective.

Next, in step S6, a dimension command including a machining correction amount for eliminating a machining error is sent to the machining apparatus 2. The process of calculating the correction amount will be described with reference to FIG. As shown in this figure, first, the dimension measurement surface S2,
S3 and the machining surfaces S2 'and S3' are defined by machining coordinate systems (MX, M
Y, MZ). Then, the dimension measurement surfaces S2, S
3 from the error in the coordinate axis direction between the machining surface S2 'and S3'
Processing errors ΔX and ΔY in the X-axis direction and the MY-axis direction are calculated.

The working direction of the processing apparatus 2 is assumed to be parallel to the plane specified by the MX and MY axes. That is, the processing error ΔZ becomes zero. The correction amount is set so as to cancel out the processing errors ΔX and ΔY. The processing device 5 sends to the processing device 2 a dimension command in which a correction amount corresponding to the processing errors ΔX and ΔY is added. Since the processing device 2 processes the component 1a based on the above dimension command, the measured dimension of the component 1a approaches the design dimension.

As described above, according to the above-described embodiment, the drawing coordinate system (X, Y, Z) in the processing device 5 is used.
Then, each surface model created from the drawing data and the measurement data is compared to calculate the measurement dimension and the dimension error. Therefore, the correction amount can be calculated accurately. Further, in the processing device 5, since the dimension command is automatically corrected according to the processing error, the processing device 2
Can be quickly controlled.

In the above-described embodiment, the processing device 2 has the grinding wheel, but the processing device 2 can be applied to a processing line having a processing device for performing processing other than grinding. Alternatively, the reference surface model and the processed surface model may be displayed on the display, and the measurement portion may be designated by an input device such as a mouse. Furthermore, measuring devices other than the transducer 3a and the touch sensor 3b may be used. When calculating the correction amount, the machining coordinate system (M
The reference surface model and the machining surface model are created on (X, MY, MZ), but the surface model on the drawing coordinate system (X, Y, Z) created at the time of dimension measurement is coordinate-converted, Each surface model may be created.

[0023]

As described above, according to the present invention,
The inspection means, based on the drawing data read from the storage means and the position information of the machining surface measured by the measuring means, between the intersections of the machining surface corresponding to the pair of base points and the straight line passing through the pair of base points. The distance (measured dimension) is calculated, and the dimensional error between the measured dimension and the reference dimension, which is the distance between the base points, is calculated. Further, a deviation amount in the coordinate system corresponding to the machining direction is calculated from the preset positional relationship between the second reference surface and the machining surface, and a correction amount for canceling the deviation amount is converted into a dimension command based on the drawing data. to add. Then, the processing device processes the component into a predetermined shape based on the dimension command. As a result, it is possible to precisely inspect the dimensions of parts of any shape with a small number of man-hours and automatically control the processing apparatus according to the inspection result.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a processing line to which a dimension inspection system according to an embodiment of the present invention is applied.

FIG. 2 is a partial cross-sectional view showing a specific configuration of the measuring device 3.

FIG. 3 is a flowchart showing a processing flow of a processing device 5.

FIG. 4 is a diagram for explaining the operation of the dimension inspection system according to the present embodiment.

FIG. 5 is a diagram for explaining the operation of the dimension inspection system according to the present embodiment.

[Explanation of symbols]

 1a, 1b Parts 2 Processing device 3 Measuring device (measuring means) 5 Processing device (inspecting means) 6 Storage device (storage means)

Claims (1)

[Claims] 1. A dimension inspection system for inspecting the dimensions of a component composed of a plurality of machined surfaces, the drawing data including position information of a pair of base points and information on a first reference plane of the component. Storage means for storing; measurement means for measuring the position of the machining surface corresponding to a preset second reference surface; straight line passing through the base point forming the pair with the machining surface corresponding to the base point forming the pair The distance between the intersections with and is taken as the measurement dimension, and the dimension error between the reference dimension, which is the distance between the base points, and the measurement dimension is calculated, and the machining coordinates are calculated from the positional relationship between the second reference plane and the machining plane. Calculate the amount of deviation in the system,
A dimension inspection system comprising: an inspection unit that adds a correction amount that cancels the deviation amount to a dimension command based on the drawing data; and a processing device that processes the component into a predetermined shape based on the dimension command. .