SU1227362A1 - Dog chuck - Google Patents

Description

The invention relates to metalworking and can be used to fasten ring-shaped parts along an inner spherical surface, for example, outer rings of spherical roller bearings.

The purpose of the invention is to improve the fixing accuracy by reducing the deformations of the fixed parts.

FIG. I shows the cartridge, a general view. lengthwise cut; in fig. 2 — node I in FIG. one.

The cartridge (Fig. 1) consists of a housing 1 in which the cams 2 are placed, moving with the help of each stem 3 connected to a drive (not shown). To hold the cams 2, spring springs 4 are provided. Cams 2 are mounted on the cams 2, connected with screws 6, and the axis of each crumbs 5 is offset relative to the axis of the cams 2 by an amount c. The contacting surfaces of the cams 2 and the crackers 5 are spherical, which allows the crackers 5 to self-align during the fixing of the part.

The working surface of the crackers 5, interacting with the internal spherical surface of the part 7, has a cylindrical shape with a toroidal chamfer (Fig. 2) which ensures reliable contact of the crackers 5 with the spherical surface of the part 7. On the case 1 paa.weuieHa Axially, the sleeve 8 moves, in the radial holes of which cams 2 are mounted.

To limit the axial movement of the sleeve 8 in the groove of the latter, a stop screw 9 is located. A stop 10 rigidly attached to the housing 1 limits the axial movement

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five

5 o

0

Placing the part 7 in the process of its basement and consolidation.

The cartridge works as follows.

In the initial position, the tapered rod 3 is retracted to the right extreme position, the parts are preliminarily based on cams 2. After the clamping drive is activated, the conical brush 3 moves to the left, the cams 2, having overcome the action of the spring springs 4, are moved apart in the radial direction. After the initial contact of the crumbs 5 with the inner spherical surface of the part 7, the axial force exerted by the cams 2 on the bushing 8 is axially changed, the system of rod 3 is cams 2 ,. sleeve 8 - detail. The fastening process ends at the moment of rigid tight contact of the base turn of the part with the stop 10. Thus, when the part is fastened in the proposed cartridge, its reliable and stable contact with the patron vnopoM 10 is always ensured, which excludes the axial installation error.

The tests carried out show that the highest pinning accuracy with minimal deformations from the clamping forces is provided if the axis of each cracker 5 is offset relative to the axis of the cam 2 by the value e (0.03-0, l) Ri, where Ri is the radius of curvature of the cam 2, and the ratio of the radii of the working surface of the rusk 5 Ry to the spherical surface of the cam 2 Ri is determined by the R2: Ri 1: 2 relationship, and the radius of the spherical surface of the rusk is 5 R3 (l, 02-1, 05) Ri (Fig. 2).

The application of the proposed cartridge improves the accuracy of fixing and reduces the deformation of the workpiece. one

FIG g

Composition-fir A. Gribkov

Editor E. KopchaTehred I. Vet) Corrector V. Booth gz

Order 1990/12 Circulation 1001Subscription

VNIIPI State Committee of the USSR

for inventions and discoveries

113035, Moekeva, Ж-35, Raushsk nab., 4/5

Branch PPP "Patent, Ud city, st. Design. four

Claims (2)

1. CAM CARTRIDGE, in the case of which spring-loaded cams with floating crackers and a taper rod are installed, characterized in that, in order to increase the accuracy of fastening, it is equipped with a sleeve mounted on the housing with axial movement with radial holes designed to accommodate cams with floating crackers moreover, the axis of each cracker is offset relative to the axis of the cams by the amount e = (0.03-0.1) Ri, where e is the displacement of the axis of the cracker; Ri is the radius of curvature of the cams, and the radius R2 of the working surface of the crackers is selected from the ratio R ₂ : Ri = 1: 2. 2. Cartridge according to π. 1, characterized in that the radius of curvature of the contacting surfaces of crackers and cams is selected from the ratio R ₃ = (1,02-1,05) Ri, where R ₃ is the radius of the contact surface of the cams. SU ₍₁₁₎ 1227362