RU1808493C - Mandrel for fixing set of piston rings - Google Patents

Abstract

Usage: for securing a package of piston rings when cutting twin workpieces into separate rings. SUMMARY OF THE INVENTION: The mandrel consists of a cylindrical body 1, inside of which, coaxially with it, a clamping mechanism is mounted. Outside the casing 1, elastic rings 7 and oval rings 16 are located, located between each pair of rings 7. The elastic rings 7 have thinned sections that allow the spring rings 7 to deflect when exposed to the expanding elements of the clamping mechanism, and protrusions designed to base the piston rings 10. Paired blanks of piston rings are drawn onto a mandrel. By means of a clamping mechanism, the elastic rings 7 are moved apart in a radial direction from the center of the mandrel to touch with the protrusions with their blanks. After finishing the treatment, the rings 7 return to their original position. The surface described around the protrusions and the outer surface of the oval rings coincide and the machined rings are easily removed from the mandrel. 1 s.p. f-ly, 3 ill.

Description

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The invention relates to metal processing and can be used to secure a package of uncut piston ring blanks during processing.

The purpose of the invention is to increase the reliability of fixing the rings to the mandrel and to increase productivity by facilitating the removal of the rings after processing.

Figure 1 shows a General view of the mandrel; figure 2 is a section aa in figure 1; Fig. 3 section BB in Fig. 2,

The mandrel for securing the packet of neva rings consists of a cylindrical body 1, inside of which, coaxially with it, is a clamping mechanism consisting of a rod 2, cones 3, expandable by a spring 4, and rollers 5 placed in longitudinal grooves 6 of the housing 1.

Clamping elements made in the form of elastic rings 7 and oval rings 16 located between each pair of elastic rings 7 are installed on the outer cylindrical surface of the housing 1.

The elastic rings 7 have thinned sections 8, which allow the elastic rings 7 to deflect when exposed to rollers 5, which are expandable elements of the clamping mechanism, and protrusions 9, designed to base the piston ring blanks. The surface described around the protrusions 9 in the uncompressed state of the rings 7 coincides with the oval outer surface of the rings 16 ..

The number of elastic rings 7 corresponds to the number of piston rings obtained after cutting the double blanks 10.

To orient the blanks 10, the mandrel body 1 is provided with a key 11 that fits into the hole 12, which is present on the inner diameter of the blank 10 of the uncut piston ring.

The nut 13 and the sleeve 14 are designed to compress (reduce) the cones 3.

The pack of elastic rings 7 is closed by a sleeve 15 rigidly fixed to the housing 1.

The base and clamping of the piston ring stack on the mandrel is as follows ...

The twin blanks 10 of the piston rings are drawn onto the mandrel, orienting them with a key 11 in the holes 12 on the inner surface of the blanks 10. With a stow between the blanks 10 and the base protrusions 9, a small gap (2-3 mm) is maintained.

By turning the nut 13 through the sleeve 14, the cones 3 are pulled which extend the rollers 5 in a radial direction from the center of the mandrel (see, FIG. 3). The expansion of the rollers 5 takes place until all the protrusions touch the elastic rings 7 with their blanks 10 of the piston rings. Moreover, since two elastic rings 7 are touching each blank, then after cutting the blank, each ring will be held by its elastic ring 7. In this case, the outer diameter of the protrusions 9 will increase and the outer diameter of the oval rings 16 (remaining unchanged) will be smaller than the diameter of the protrusions. thus ensuring the free passage of the cutter during cutting.

After the cutting is completed, the cones 3 are pulled apart, and the rings 7 return to their original state and the surface described around the protrusions 9 coincides with the outer oval surface of the rings 16 (not shown). And thus the treated rings are easily (without special equipment) removed from the mandrel.

 Technical and economic efficiency from the use of the invention will be expressed in improving the quality of the piston rings and lowering the cost of equipment, due to the increased reliability of fixing the rings on the mandrel and ensuring their free removal after processing.

Claims (2)

1. A mandrel for securing a package of piston rings, comprising a housing, radially movable clamping elements for interacting with a clamping mechanism, characterized in that, in order to increase the reliability of clamping, the clamping elements are made in the form of a set of elastic rings with protrusions designed for the base of the piston rings, and the sections of the rings between the protrusions are made from the condition of deformation under the action of the mech. the bottom of the clamp. 2. The mandrel according to claim 1, with the aim that, in order to increase productivity by facilitating the removal of rings after processing, the mandrel is equipped with rings, the outer surface of which is oval and forms, together with the protrusions of the elastic rings a seating surface, with rings installed between each pair of clamping elements. Aa 6 V / 7a & r / nЈ // gga pv.2