SU1548656A1 - Method of determining coordinates of points of surface - Google Patents

Abstract

The invention relates to the field of engineering. The aim of the invention is to expand the technological capabilities of the method for determining the coordinates of the surface points of the part. The purpose of the invention is achieved by installing a step bridge 4 on the measured surface of part 1 and sequentially performing a cycle of operations consisting of measuring the angle of inclination of the step bridge 4 relative to the reference plane 6, rotating the part 1 relative to its axis, measuring the angle of inclination of the step bridge 4 relative to the basic the plane 6, the movement of the step bridge 4 along the measured surface of the part 1 to the measurement step and the calculation from the obtained values of the angles of the coordinates of the surface points of the part 1. 3 Il.

Description

315

The invention relates to the field of mechanical engineering and can be used to determine deviations from the shape of parts using a stepwise method, for example, to measure deviations from the roundness of rolled shells directly on rolling machines.

The aim of the invention is the expansion of technological capabilities by providing measurement of large-sized cylindrical parts.

FIG. 1 shows a diagram of the method in the first measurement step; in fig. 2 is a schematic of the method during the first phase of the second step; in fig. 3 is a schematic of the method during the second phase of the second step.

The measurement of surface point coordinates is done as follows.

On the inner surface of the hollow cylindrical part (shell) 1, located in the roller-supports 2 rollers with retracted pressure roller 3, a stepping bridge 4 with an inclination meter 5 is installed at the control points A0 and A, and its angle of inclination is measured relative to base plane 6 in the XA0Y coordinate system rigidly connected to the measured part

After that, the measured part 1 is turned on roller 2 by an angle convenient for the operator to reset the step bridge, and measure the comfort angle o62, the inclination of the step bridge relative to the reference plane 6. Next, move the step bridge to the second measurement step to points А1 and АЈ and again measure an angle of Ј21 of the inclination of the bridge relative to the reference plane 6.

Repeating the cycle of operations: measuring the angle of inclination of the step bridge 4, turning the part 1, measuring the angle of inclination of the step bridge 4, and moving it to the next measurement step, get a sequence of values of the angles of the step bridge, ОЈг,, ОЈгг, ...,; ; 2, where i is the number of measurement cycle „

The coordinates of the current points are calculated by the formulas

V

K-1

- .1 + l.cosk, + T. (oi-ia-ct; 1) l,, L J

.sink +,)

 G: O-

 cosed ,,, i l;

Y; 1- sintf ,,,,

where Xk is the abscissa of point A in the Kth cycle;

YK is the ordinate of point Ak in the Kth cycle;

Oi, (- the angle of the stepping bridge after the first installation; - the angle of the stepping bridge after turning the part in the 1st cycle, i 2;

. ANGLE of inclination of the stepping bridge after its permutation in the ith cycle;

1 - distance between the supports of the step bridge (measurement step).

Claims (1)

The obtained values of the coordinates of the surface points are subjected to further mathematical processing in order to calculate the deviations of the shape, size and location of the surface from the nominal. Invention Formula The method of determining the coordinates of the surface points of a part, including installing a step bridge on the measured surface, sequentially performing a cycle of operations consisting of measuring the angle of the step bridge relative to the reference plane and moving the step bridge along the measured surface to a step of measurement with the subsequent calculation of the coordinates of the surface points, characterized in that, in order to expand technological capabilities, before each operation of the interlea ™. The bridge rotates the part about its axis and measures the angle of inclination of the step bridge relative to the reference plane, which is used when calculating the coordinates of surface points. Horizon plane figure 1 Horizon plane X