SU468764A1 - Oscillating mechanism for grinding center holes - Google Patents

Description

The invention relates to the field of metal cutting and can be used in 5 machines for grounding answers.

Mechanisms are known for oscillating machine tools for grinding of pivot-opening SC-iiiii, in which the change is not a complete machine; (01H) is carried out by the pnp pomoschis eskontrnkovo-lever or rocker mechanisms.

However, in the UDAH mechanisms, the speed of the res I1 iipii ui, ni (j); to riférien () pic abrasive 1H1H circle changes from zero in the cone of the cone of the circle to the greatest magnitude of the cylindrical part. In accordance with - / gim, the cutting ability of the abrasive wheel; diminishes as one approaches its height, and therefore the pattern of the processed bore of the center hole is distorted.

The purpose of the invention is to improve the accuracy of the processed surface.

This is achieved by the cam: C; :; n-ide of the 1st cylinder with the foundation ON i; form, n. the possibility of non-displacement along the axis of the gearbox shaft.

FIG. 1 shows the proposed mechanism oscillating; in fig. 2 shows a section A — A in FIG. one; FIG. 3 - kinematic scheme of oscillation mechanization; in fig. four

- cam scheme; in fig. o is a graph of the measured current cam radius at various values of S, value of the displacement of the vran1 axis, of the cam from the center of the ellis (curves of n b).

The oscillation mechanism is composed of case 1, on the rolling tracks 2 of which carriage 3 is installed with a grinding spindle 4 fixed in it. On the case there is an electric motor 5 connected to the shaft of a coupling G with a gearbox consisting of a worm shaft 7 N worm 8. At the exit of the shaft 9 of the reducer, the cam 10 is positioned, the 1O1 itself is the HaK.ioHHijiii cylinder with the base in the form e.1L1G: sa. K Ma4o; v 10; 1 cre 1 le ia isa.Ty 9 irn of the screw 11, pusher 12 on the delivery 13. The body is fixed to the limb 14. In contact with the cam 10, there is a roller 15 located on the two-arm lever 16. Finger 17 of the lever 16 controls with a screw 18, which is included in the nut 19 attached to the carriage 3. The som short circuit of the axle system is spring 20 installed between the housing and the carriage 3.

CooTHOHjeiiHe between 1param .exannism p, jR, X, S is determined by the following equation. In accordance with the law. M neremegtsein carriage curve of or 6

in fig. o is determined by the above formula

- p / Scos + and + (a-S),

 sili y h

where a -; sh to

o-current cam radius;

R is the radius of the circle of the cam section perpendicular to the generator of the cylinder;

- the angle of inclination of the cylinder-forming cam towards the base of the cam;

S is the magnitude of the displacement of the axis of rotation of the cam from the center of the ellipse; 9 - cam rotation angle;

and - the big axis of the ellipse.

The graph in FIG. 5 shows that when the abrasive wheel is in the extreme left position, either the tool dwell occurs (curve a, or the circle at this moment makes a reciprocating movement with a small stroke (curve b). This leads to that increases the time of contact of the abrasive wheel with the surface to be processed at the small diameter of the centering OTECpCiiiH and that g 11 ... |; m increases the removal of metal in this zone.

The device works as follows (in the following way. When the electric motor 5 is turned on, it rotates: iiic from. It will be transmitted through the coupling 6, the worm 7, the cog wheel 8 and the chipper.

A shaft 9 on the cam 10. As a result of the rotation, the cam 10, through the roller 15, pumps the lever 16, which moves the screw 18 and, therefore, the carriage 3 along the guides 2.

Depending on the magnitude 5 of the displacement axis of rotation of the cam 10 from the center of the ellipse (see Fig. 4), the maximum oscillating stroke A of the actuator, which is determined by the difference of the largest and smallest current cam radius (see Fig. 5), t. e. L Rmaks - R.M.Sh.

The change in the magnitude of the displacement 5 is made by moving the cam 10 along the output shaft 9. The oscillation stroke is determined over the limb 14. After the cam 10 is displaced, it is fixed on the shaft 9 by a screw 11 through the pusher 12 and the space 13.

PRIORITY AREA

Oscillation mechanism of the machine for grinding center holes, made in the form of a gearbox with a cam on the output shaft and a system of levers connecting the cam to the grinding carriage; foot 1 11; Section, characterized in that, with the use of precision of the machined vertex Hi .uTii, the cam is made and it is inclined (Sec. Ch1 with the base in the form of an ellipse or power box).

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