SU878604A1 - Device for profiling conjugated surfaces - Google Patents

Description

one

The invention relates to a tool for drawing curves and can be used in educational institutions.

A device for profiling mating surfaces is known, comprising a screen 5 rotatable with respect to the axis and means for drawing.

The prior art device does not allow profiling of the surface of rotation mating with a ruled helical surface.

The aim of the invention is to expand the range of tasks to be accomplished by providing a profile of the surface of revolution connected to a ruled i5 helical surface.

To achieve this goal, the device has a screw movement mechanism for drawing means, consisting of a drum with a screw groove and a fixed rod, 20 located in the groove, and a screen swing mechanism containing a curvature, a slide hinged to it and a lever rigidly connected to the screen axis. connected to the slider, wherein the means of denial is made in the form of a light beam attached to the drum source.

FIG. 1 shows a diagram of the device; in fig. 2 - the screen with the traced curves and the desired profile; in fig. 3 - sopr - zo

Married couple: surface of rotation - screwed ruler surface.

The device contains a means of drawing, made in the form of a source of 1 beam of light mounted on a tripod 2, which is mounted to rotate and move in the fist 3. The fist 3 is mounted on the shaft 4 to rotate and move. The screw movement mechanism of the drawing means comprises a fixed pin 5 placed in the screw groove 6 of the drum 7 mounted on the shaft 4. The shaft 4 is mounted along the axis I-I of the body 8 with a predetermined ruled screw surface. The screen 9 fixed on the axis II-P has a swing mechanism comprising a drive 10, a curved shaft 11, a slider 12 hinged to it and a lever 13 rigidly fixed on the axis II-P.

The parameter PI of the helical groove 6 of the drum 7 is equal to

R, .R- / ",

where m is the required zoom scale

required profile; p is the parameter of a given ruled helical surface;

P .ctg,

where d is the outer diameter of a given

screw surface; U) - the angle of elevation of a given screw surface on the outer diameter.

On the screen 9, on the side of the source 1 of the light, a photosensitive paper is fixed. The axis II-II, on which the screen 9 is mounted, is positioned at an angle b to the axis I-I, equal to the angle of installation of the rotation body 14 when mating with the lined screw surface 8 of the body (Fig. 3), for example

5 90 ° - O),

where w is the elevation angle of a given helical groove on the outer diameter.

The distance M is determined by the formula

M m-D,

where t is the required zoom scale

required profile;

D is the distance between the axes of the interfaced surfaces.

For profiling, the light source 1 is moved along a helix, as a result of which a beam of light l successively passes through the positions of the rectilinear generators aa, located on one side of a given ruled helical surface, and the screen 9 is pumped, while it passes through the outermost A, C and central B position. As a result of the combination of these movements on the photosensitive paper attached to the screen 9, the beam of light reproduces a field of 15 randomly arranged curves that form the desired profile of the surface of rotation coupled to a given ruled helical surface without constructing an envelope. To obtain a complete profile of the conjugate surface, the beam of the source of light 1 is also combined with the position of the generatrix CW of the other side of a given ruled helical surface, after which the profiling is repeated.

If it is necessary to obtain a profile of the end section of a ruled screw surface, the screen 9 is fixed at a position perpendicular to the axis I-I (6 ° 90 °), after which the screw source is reported to the light source

obtaining the profile of the normal section, the screen 9 is set to the position in, then the screw movement is also reported to the light source 1. The proposed invention may be

it is also used for the case of conjugation with the screw surface of an alternating schag, for this purpose, the groove 6 with the identical screw must be made on the drum 7.

Claims (1)

1. USSR author's certificate number 397378, cl. In 43 L 11/00, 1971.