JPH10185548A - Method and device for discriminating surface shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically discriminate the straightness of the diameter of a pipe, by placing an object to be discriminated on a surface plate having a reference horizontal plane, and calculating the distance between each point by using a plurality of distance measuring means arranged on coordinate lines which constitute X-Y coordinates and are drown in a grid. SOLUTION: Distance measuring instruments 5 are arranged on a mounting base 9 which is provided immediately above a surface plate 11, on which an object A to be discriminated is placed and which has a reference horizontal plane with an interval in between. The instruments 5 are arranged on coordinate lines which constitute X-Y coordinates and are drawn in a grid, with (m) pieces of instruments 5 being arranged along the vertical (Y) axis and (n) pieces of instruments 5 being arranged along the horizontal (X) axis. Each instrument 5 is composed of a visible laser displacement sensor which measures the distance to an object, by projecting a laser beam upon the object from a light emitting device and detecting reflected beam from the object. An input device 5 fetches numerical value signals from the instruments 5 and instructs a display 7 to display the numerical values. A central processing unit 1 starts a program, calculates the straightness of the diameter of a pipe from the calculated distance between each point, and displays the straightness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method and an apparatus for determining a surface shape.

[0002]

2. Description of the Related Art For example, when measuring the bending of a pipe, at present, the degree of bending is determined by looking at the difference between the end face of the pipe and the opposite end face. At the measurement point, it is necessary to measure the center of the pipe diameter, but the center of the pipe diameter has been determined by human judgment.

[0003]

However, determining the center of the pipe diameter involves considerable difficulty. The present invention solves the above-mentioned problems, and uses a laser light distance measuring device to automatically determine the center of the tube diameter, measures the distance to the object, and reads the surface shape of the object to determine the position of the central portion. An object of the present invention is to provide a shape discriminating method and apparatus.

[0004]

Means for Solving the Problems To solve the above problems, the configuration of the present invention is as follows. That is, the method of the first configuration includes a surface plate having a reference horizontal plane on which an object to be discriminated can be placed, and a grid plate arranged immediately above the surface plate with an interval therebetween to form XY coordinates. Placing an object on the surface plate using m distance measurement means on the vertical (Y) axis and n distance measurement means on the horizontal (X) axis, arranged on a coordinate line;
The shortest distance points XO (nO, mO) to XN (n
N, mN), the points A (nA, mA) and B (nB, mB) at both ends in the horizontal axis direction at the shortest point, and the center point C (nC, mC) between the points A and B. ), The shortest point D (nD, m) on the Y axis passing through the point C
D), calculating the distance between points A and B,
This includes calculating the distance between points C and D, calculating straightness from the distance, and printing the calculated value.

[0005] The apparatus of the second configuration comprises a surface plate having a reference horizontal plane on which an object to be discriminated can be placed, and a grid board arranged immediately above the surface plate with an interval therebetween to form XY coordinates. M on the vertical (Y) axis and n on the horizontal (X) axis, and the shortest distance points XO (nO, mO) to XN in the Nth column. Means for determining (nN, mN) and a point A (nA,
mA) and B (nB, mB), a means for determining a center point C (nC, mC) between the points A and B, and a shortest point D (nD, mD); a means for calculating the distance between points A and B;
A means for calculating the distance between D, a means for calculating straightness from the distance, and a means for printing the calculated value.

[0006]

Embodiments of the present invention will be described below based on one embodiment shown in the drawings. In FIGS. 1 and 2, a surface plate 11 having a reference horizontal surface on which an object A to be discriminated can be placed is provided. 5 are arranged. The measuring device is composed of m laser distance measuring devices on the vertical (Y) axis and n laser distance measuring devices on the horizontal (X) axis, which are arranged on grid lines forming XY coordinates.

A known visible light laser displacement sensor is used as the measuring device. That is, a laser beam from a projector is irradiated on the surface of an object, and a reflected beam from the object is detected by a photodetector to measure the distance. Keyence Corporation (Head office; 2-13 Akitacho, Takatsuki-shi, Osaka) Made of LB
An ultra long range type of -1000 series is used.

This apparatus uses a sequencer (programmable controller), as shown in FIG. 3, with a central processing unit 1 as a center, a storage unit 2, an arithmetic unit 3, a distance measuring unit 5, and a keyboard. The devices 4 are connected to each other, and furthermore, the display devices 7,
The printing device 8 is connected.

The central processing unit 1 is mainly composed of a microprocessor, and the storage device 2 is composed of a read only memory (ROM) and a random access memory (R).
AM), and stores a program that defines an operation procedure of the central processing unit 1 and data to be processed by the central processing unit 1.

The input device 4 can also take in a numerical signal from the distance measuring device 5 and instruct the display of the distance at each point. According to the operation command from here,
The central processing unit 1 causes the display unit 7 to perform numerical display in cooperation with the storage device 2, the arithmetic unit 3, and the like. In this example, the display 7 is a two-dimensional screen display using a liquid crystal display.

Next, an embodiment of the present invention using the above-described distance measuring device will be described with reference to a flowchart shown in FIG. When the program starts, the distance from R (o, o) to R (n, m) is measured (step S1), and each Y of N = 0, 1, 2,.
The coordinates are sequentially specified (step S2), and for each of the Y coordinates, each X coordinate of M = 0, 1, 2,... M is sequentially specified (step S3), and the distance at each coordinate point is measured. The shortest distance X coordinate point on the coordinates is obtained, and in this way, the shortest distance point XO (nO, mO) 〜
XN (nN, mN) is obtained (step S4).

Next, at the shortest point, a point A at both ends in the horizontal axis direction.
(NA, mA) and B (nB, mB) are obtained (step S5). For example, in FIG. 4, A (nA, mA) =
(4, 7), B (nB, mB) = (36, 7).
Next, a center point C (nC, mC) between the points A and B is obtained (step S6). That is, the determination of C (nC, mC) is performed as follows. nC = (nB−nA) / 2 + nA = (36−4) / 2 + 4 =
20 mC = (mB−mA) / 2 + mA = (7−7) / 2 + 7 = 7 Next, the shortest point D (nD, m) on the Y axis passing through the point C
D) is obtained (step S7). As a result, the point C (2
0,7), the shortest distance point D (nD, m) on the X-ray coordinates
D) = (20, 4) is determined.

Here, the distance between A and B (L), the distance between C and D (l) and the straightness (S) are obtained by the following equations, and these equations are stored in the storage device 2. A-B distance (L) = (nB-nA) × α = (36−4) × 32α (Equation-1) α: Distance between lateral detector heads C-D distance (l) = ( mC−mD) × β = (7−4) × β = 3β (Expression-2) β: Distance between vertical detector heads Straightness (S) = 1 / L = 3β / 32α (Expression-2) 3).

The distance between points A and B is calculated based on equation (1) (step S8). The distance between points C and D is calculated based on equation (2) (step S9). Based on the calculated straightness (step S10), the calculated value is displayed and printed.

The present invention is not limited to the embodiments and embodiments described above, but includes various modifications without departing from the spirit and scope of the appended claims.

[0016]

According to the configuration of the present invention, the straightness of the pipe diameter can be automatically determined.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a block diagram of a control unit of the present apparatus.

FIG. 4 is an explanatory diagram of a bending degree measurement.

FIG. 5 is a flowchart showing an operation of the central processing unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Central processing unit 2 Storage device 3 Computing device 4 Input device 5 Distance measuring device 6 Output device 7 Display device 8 Printing device 9 Mounting stand

Claims (2)

[Claims] 1. A surface plate having a reference horizontal plane on which an object to be discriminated can be placed, and placed directly above the surface of the surface plate with an interval therebetween, and placed on a grid line of XY coordinates constituting an XY coordinate system. Using m distance measurement means on the vertical (Y) axis and n distance measurement means on the horizontal (X) axis, placing the object on the platen, the point of the shortest distance in the Nth column XO (nO, mO) to XN
(NN, mN), the points A (nA, mA) and B (nB, mB) at both ends in the horizontal axis direction at the shortest point, and the center point C (nC, nC) between the points A and B. mC) and the shortest point D (n) on the Y axis passing through the point C
D, mD), calculating the distance between points A and B, calculating the distance between points C and D, calculating the straightness from the distance, and printing the calculated value. A method for determining a surface shape, comprising: 2. A surface plate having a reference horizontal plane on which an object to be discriminated can be placed, and disposed on the surface of the plate with a space between the surface plate and an XY coordinate line. M distance measurement means on the vertical (Y) axis and n distance measurement means on the horizontal (X) axis, and the shortest distance point XO (n
O, mO) to XN (nN, mN), and points A (nA, mA) and B at both ends of the shortest point in the horizontal axis direction.
Means for determining (nB, mB), means for determining the center point C (nC, mC) between the points A and B, and Y passing through the point C
Means for calculating the shortest point D (nD, mD) on the axis, means for calculating the distance between points A and B, means for calculating the distance between points C and D, and calculating straightness from the distance And means for printing the calculated value.