SU1212706A1 - Cam mandrel - Google Patents

Description

The invention relates to metalworking and can be used for securing blanks when machining on machine tools.

The purpose of the invention is the expansion of technological capabilities by increasing the range of fixed products.

FIG. 1 shows the mandrel, a general view; in fig. .2 - section A-A in FIG. I; in fig. 3 - section BB on. one; in fig. . 4 is a fragment of a sweep of the slots of the front part of the bar of the mandrel. FIG. 5 shows some geometrical relationships in the proposed mandrel. In the bore of the frame 1 of the mandrel, a movable m 2 was installed, with screw and right and left inclined grooves 3 and 4 made on it, “above”. cross section) and angle v (in longitudinal section). The cams 5 of the left row and 6 of the right row have on the end surfaces bevels made at an angle a. A cap 7 is attached to the mandrel body from the end. The blank 8 is based on the outer surface of the cams 5 and 6, which are mounted with spring rings 9-T ha 2 and are rotatably mounted relative to the actuator stem 10.

Kulachkov mandrel works as follows.

After installation, the workpiece 8 on the mandrel of the ha 2, moving left (Fig. 1), interacts with its grooves 3 and 4 with the end bevels of the cams 5 and 6. At the same time, they move from the axis of the mandrel to the periphery. Due to fluctuations (within tolerance) of the size of the base hole of the workpiece in the longitudinal section of the cams 5

and 6 of one of the two races reaching the surface of the base hole earlier than the other. If these are cams 5 of the left row (fig. 1), then, with the continuing action of axial force, per ton,

it, moving along its axis, at the same time begins to turn counterclockwise relative to the shaft 10 (Figs. 2 and 3), while continuing to eject the cams 6 of the right row. I. .tak to those

then, until both rows of cams fix the workpiece 8. If the cams 6 of the right row reach the surface of the base hole of the workpiece 8 first, then the pull 2, moving in axial direction, rotates relative to the fixed cams 6 in a clockwise direction. When this happens, the cams 5 of the left row extend, until the workpiece 8 is fixed in two sections.

Normal mandrel work

with a choice of angles a and slope of the grooves (Fig. 5). The triangle ABG lies in the axial section plane of the mandrel; the quadrilateral A CKQ lies in the plane of the base of the groove; segment BB is parallel to the axis of the mandrel. Projection angle a

on the plane of the axial section is marked a ,, on the plane of the longitudinal section of the mandrel - V- The presence of the angle Y provides the radial movement of the cams during axial movement of the rod 2, and of the angle a - the radial movement of the cams during rotation of the cams. The width of the slots 3 and 4 (shown in Fig. 5) is selected depending on the diameter of the cams 5 and 6 and the magnitude of their radial stroke. Angles a, - h are taken in the range of 10-14 °. The angle a is equal to:

a arctg (| -j). bff

FIG. 2

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OnpaSnu axis

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Claims (1)

CAM AREA, in the radial openings of the housing of which there are two rows of spring-loaded cams with bevels designed to interact with reciprocal push beveled surfaces of the rod connected to the actuator rod, characterized in that, in order to expand technological capabilities by increasing the range of fixed products, the beveled bevel surfaces the rods are made in the form of right and left helical grooves inclined in two planes relative to the axis of the mandrel, and the rod is installed relative to the rod water rotatably. Figure 1