SU1468674A1 - Lathe self-centering chuck - Google Patents

Abstract

The invention relates to a machine tool industry, and more specifically to devices for securing blanks on a lathe spindle. The aim of the invention is to provide automatic replacement of interchangeable cams. In the body 1 of the cartridge, the sliders 2 are moved by the thrust 9 through the wedge head 10. The replaceable cam 5 is installed in the slider hole, the shank of the replaceable cam has a groove with inclined generators 15, which interact with the inclined lateral surfaces. tons of windows, made in the spring-loaded check 7, located in the slider. On the shank there is a gear wreath 12, which interacts with an internal gear wreath made in slider 2, as well as a conical surface 13 interacting with a counter surface made in slider 2. At the periphery of the cam 5 there are a number of working surfaces, outlined by arcs of circles of various radii . When the cartridge is retooled to a different clamping diameter, the check 7 is inserted into the slide and the shank is released. Under the action of the spring 6, the crown 12 and the surface 13 come out of contact with the mating surfaces in the slider. By turning the cam 5, a new angular position is established, and then the cam is pushed in, overcoming the spring 6. When the cam 5 is replaced, the check 7 is inserted and the cam is inserted, and then a new one is inserted which is tightened by a check 7 based on the surface 13 and fixed by the crown 12 2 hp f-ly, 8 silt (O (L

Description

FIG.

5

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FIG. eight

Claims (3)

Claim 1. Lathe self-centering chuck, in the radial grooves of the casing - which are sliders, in the openings of which are interchangeable cams with a working part and a shank, and on the working part on the periphery there are a number of working surfaces outlined by arcs of circles, as well as a mechanism for fixing the angular position of the interchangeable cams and their basing mechanism, characterized in that, in order to ensure automatic replacement of interchangeable cams, each slider is equipped with a check spring-loaded relative to it, to which the window is made inclined at an angle less than the self-locking angle of the side surfaces, and a removable liner has a groove cam with inclined, the angle of inclination which is equal to the angle of inclination of the side surfaces of the window, and the check is mounted for radial movement in a hole formed in the slider. 2. Lathe chuck in π. 1, characterized in that the basing and fixing mechanism is made in the form of a cone and a gear ring, sequentially located on the shank of the interchangeable cam, designed to interact with similar surfaces made in the hole of the slide. 3. Lathe chuck for PP. 1 and 2, characterized in that the centers of curvature of the arcs of circles outlining the working surfaces of the interchangeable cam are located on a circle described from the center of its shank with a radius equal to the distance between the axes of the cartridge and the shank. Aa FIG. 2. I68674 Figure 4 FIG. 6 FIG. 7 View 8 (enlarged)