SU823080A1 - Apparatus for working aerodynamic grooves on semisphere surface - Google Patents

Description

(54) DEVICE FOR PROCESSING OF AERODYNAMIC CANALS ON THE SURFACE OF HEMISPHERE

one

The invention relates to abrasive machining and can be used in precision instrument making in the manufacture of gyroscopes.

A device for machining aerodynamic grooves on the surface of a loususphere is known, comprising a pritier tool spindle and a workpiece spindle mounted for reciprocating rotary motion and connected with a drive kinematic chain 1.

With the help of a known semi-automatic machine, aerodynamic grooves are processed, the edges of which are described by laxodromes. In this case, the movements of the part and the tool are in phase.

The purpose of the invention is to provide the possibility of processing on the spherical surface of the grooves in the form of areas (flags) of the same depth in the latitude of the sphere.

The goal is achieved by the fact that the kinematic chain of the spindle of the part is equipped with a cylindrical cam, the profile of which has two sections of constant radius corresponding to the extreme angular positions of the spindle of the part and are conjugated to each other by equal lift curves.

Moreover, the angle of the section of a constant radius corresponding to the extreme position of the spindle of the part at which the tool leaves a part of its width from the surface to be machined is selected from the condition

X - - - fig

Jtf /

one

e

- the angle of the constant cam radius corresponding to the other extreme position of the part spindle;

i

- the width of the lap;

with

-the value of lapping on a deep meridional groove.

Claims (1)

FIG. Figure 1 shows the kinematic scheme of the device proposed; in fig. 2 - workpiece, section along the axis of the base hole; in fig. 3 - the same, top view; in fig. 4 - cam profile, providing equal depth of the platform in terms of the sphere; in fig. 5 - possible cases of obtaining pads when the parameters of the cam profile deviate from the optimum. The object of processing is an element of an aerodynamic bearing in the form of a hemisphere, on the surface of which it is necessary to process several, for example, six areas with a depth of several micrometers and a width of 20-30 °. Ploch, adki should have access to deep and narrow meridongal grooves. The material of the part is special high-hardness ceramics. Item 1 set on the spindle 2 products. Guitir 3 interacts with the surface of the part, suspended on flat springs 4 to the tool spindle 5. The spring 6 provides the pressing of the lap to the part with a certain force. Drying processing is being confirmed. joint movements of part and priter. From the engine 7, the movement is transmitted to the camshaft 8. From the camshaft, the movement is transmitted through the articulated four-bar bearing 9 to the tool spindle and through the gear system 10 to the cam 11, the lever 12 with the roller 13 and to the spindle 2 of the product. Such a construction of the device provides the swinging movements of the grounding on the ple / 3 along the height of the sphere and the relative movements of the children and the lap along the latitude of the sphere on the fit and at a speed much lower than the speed of the lap in the height. High requirements are placed on the correctness of the shape of the bottom of the platform produced on the surface of the hemisphere. Especially in the direction of the latitude of the sphere, which coincides with the direction of rotation of the sub-sphere in the support. So, at a depth of h pdosh of several micrometers, the deviation of the profid bottom of the bottom pads is a fraction of a micrometer. Therefore, the law of motion priter in this direction can not be chosen arbitrarily. Theoretically, the depth of the platform is constant along the orb of the sphere with a point tool moving along the surface at a constant speed. At a certain width in the priter, the profiling conditions are sharply violated and the profile of the area being machined takes the form shown in FIG. 56. In the proposed device, the grounding in the latitude of the sphere is carried out by rotating the part from the cam, the profile of which has two sections - and. constant radii RI and RI, corresponding to the extreme wait of the grinding and coupled with each other by equal lift curves. Indeed, if Jj and gmalia areas, then the site has a slightly faulty profile (Fig. 56), but if these corners are chosen with good ones, then the pad has a poor profile of the reverse kind (Fig. 58). As can be seen from FIG. 3, the formation of the platform in the extreme positions is not the same. In one of the extreme positions, the lap turns into a pain groove with a part of its width from the work area. neck depth. If the time to priter in extreme positions, characterized by angles i and J (z. Cam, the same, then pdosh, hell has a roll in the direction of the deep groove in this extreme position (Fig. 5a), therefore please j profile cam, corresponding to this extreme position of the priter, you should choose from the ratio between the width of the priter pr and the value from the priter priste to the deep meridional groove according to the condition where is the angle of the constant cam radius corresponding to the other extreme position of the spindle Bleeding yi. However, it is possible to get burrs on the edge of the groove. The best results are obtained at C 1 / 2B. The proposed solution allows machining the grooves on the hemisphere surface as a platform of equal depth in the sphere's width. containing a tool spindle with priter and spindle spade, installed with the possibility of reciprocating motion and connected with a drive kinematic chain, characterized in that to ensure that grooves can be processed in the form of areas of equal depth in the sphere’s width; in the extreme position, in which the irithir leaves part of its surface from the surface to be treated, the pleasing of the section of constant radius is chosen from the condition G - Ji where X4 is the corner of the section of constant radius of the cam corresponding to the other end position schpindel parts; -the width of priter; -the value of lapping into a deep meridian groove. Sources of information taken into account during the examination 1. Author's testimony of the USSR No. 477826, cd. B 24 B 11/00, 1972. V FIG. 2 ig. one FIA FIG. five