US3722249A - Device for rolling corrugated tubular parts - Google Patents

Abstract

A device for rolling corrugated tubular parts, in which there is provided a row of series arranged passes formed by toothed rolls with at least the first of the passes in the direction of rolling being effected with driven toothed rolls.

Description

United States Patent [191 Zhukevich-Stosha et al.

[ 51 Mar. 27, 1973 DEVICE FOR ROLLING CORRUGATED TUBULAR PARTS [22] Filed: Dec. 3, 1970 [21] Appl. No.2 94,745

[52] U.S. CI ..72/187, 72/194 [51] Int. Cl. ..B21d 15/06 [58] Field of Search..l.....72/77, 78, 98, 99, 100, 187,

[56] References Cited UNITED STATES PATENTS 2,757,706 8/1956 Johnston ..72/96 Primary Examiner-Lowell A. Larson Attorney-Holman & Stern [57] ABSTRACT A device for rolling corrugated tubular parts, in which there is provided a row of series arranged passes formed by toothed rolls with at least the first of the passes in the direction of rolling being effected with driven toothed rolls.

3 Claims, 7 Drawing Figures PATENTEDHARZYISTS sum HP 3 f 3 111 f I H mm Ma 0 g 4 '2 m 13 I4 I I 7 6 HL 11 12 .gi M 11 u DEVICE FOR ROLLING CORRUGATED TUBULAR PARTS BACKGROUND OF THE INVENTION The present invention relates to devices for rolling corrugated tubular parts to be used, for instance, as sheathing for cables.

PRIOR ART Prior art corrugating devices are known which comprise a pass formed by toothed rolls, and through which tubular blanks are forced.

When corrugating by longitudinal rolling in a toothed roll pass provided with a round passage opening, outer wrinkles are formed on the surface of the blank at the places of contact with butt joint areas of two adjacent rolls, and such wrinkles are caused by the roll tooth edges pinching portions of the outer surface of the blank. This is due to the fact that, in the case of a round passage opening of a pass whose diameter is less than that of the blank, the penetration of the toothed rolls into the blank is initiated by the sharp edges of the teeth.

With a view to eliminating the outer wrinkles, in the known devices, provision is made of an inlet arrangement provided with adjustable smoothing members with whose aid longitudinal grooving is effected on the blank in the places of wrinkle formation, and as a result of which the wrinkles on the corrugated surface are pressed inwardly.

It should be noted that corrugated sheathings with inner wrinkles feature low plasticity and find no practical application.

As to forcing the blank through the toothed roll pass, the potentialities of the device are limited by the condition of the buckling strength of the parts being corrugated and of the compression strength during the blank contact with the toothed surface of the rolls. This rules out the possibility of using the known devices for corrugating parts made of a soft metal and featuring a small diameter and wall thickness.

It is an object of our invention to provide a corrugating device which, regardless of the diameter-to-wall thickness ratio of the tubular blank, attains a corrugation of any depth featuring no wrinkles or indentations, as well as for the axial displacement of the blank within the device without using any additional mechanisms.

SUMMARY OF THE INVENTION .of the passes in the direction of rolling being defined by driven toothed rolls, with the curvature radii of their concave toothed surfaces being greater than the radius of a circle inscribed in the pass, and each subsequent pass with respect to the preceding pass being turned about the axis of rolling through an angle insuring the mutual overlapping of butt joint portions of the rolls forming the passes.

In the specific embodiment of the device, the passage cross-section areas of the passes decrease in the direction of rolling.

In the present device, the corrugation can be effected without wrinkles and indentations owing to the fact that the initial pressing of the blank is effected by the middle portions of the teeth and not by the edges.

When corrugating with the present device, no additional mechanisms are required for effecting the axial displacement of the blank for the functions of such mechanisms are performed by the corrugating toothed rolls rotated from a drive, which provides for corrugating thin-walled tubular parts of a small diameter and unlimited length.

Presented hereinbelow is a detailed description of an exemplary embodiment of the present invention with reference to the accompanying drawings, wherein:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 view in side elevation of a corrugating device according to the present invention:

FIG. 2 is a view taken along the line lI-II of FIG. 1, the view looking in the direction of the arrows;

FIG. 3 is a view taken along the line III-III of FIG. 1, the view looking in the direction of the arrows;

FIG. 4 shows diagrammatically the manner in which a tubular part to be corrugated is rolled; and,

FIGS. 5a, 5b, 5c illustrate diagrammatically passage openings of the passes.

DETAILED DESCRIPTION OF THE DRAWINGS Referring to FIG. 1, a frame 1 of the device mounts one or several stands 20, 2b. Each stand 2a, 2b includes a housing 3 on whose side walls are arranged, with a possibility of setting displacement, three carriages 4 provided with built in reducing gears 5 as shown in FIG. 2.

The setting displacement of the carriages 4 relative to the housing 3 of the stands 2a, 2b, as well as their locking in place, is effected by means of screws 6.

Secured on output shafts 7 of the reducing gears 5 are rolls 8 having concave toothed working surfaces. The toothed rolls 8 coact to form passes whose passage openings are set and adjusted by means of the screws 6 due to the displacement of the carriages 4 on the housing 3 of the stands 2a, 2b.

Input shafts 9 (FIGS. 1 and 3) of the reducing gears 5 are connected to each other and to output shafts 10 of a distributing reducer 11 by means of toothed couplings 12. By means of an analogous coupling 12, an input shaft 13 of the distributing reducer 11 is connected to a shaft 14 of an electric motor 14a.

The passes of the device formed by the toothed rolls 8, which are shown in detail in FIG. 4, are turned relative to each other so that the butt joint portions of two adjacent rolls 8 mutually overlap in each subsequent pass with respect to the preceding pass in the direction of the common axis of the passes.

As shown in FIGS. 5a and 5b, the curvature radii of the concave toothed surfaces of the rolls 8 forming each of the passes are greater than the radius of a circle inscribed in the pass, with the exception of the last pass in the direction of rolling and which last pass is illustrated in FIG. 50.

The present device operates inthe following manner:

Depending upon the diameter of the tubular parts to be corrugated, in the device are placed stands whose passes correspond to a specific rolling, that is, the gage of the passes depends upon the blank diameter. The rotation from the electric motor 141: (FIG. 1) is transmitted via the shafts 14 and 13, distributing reducer 1 l and reducing gears 5 to the toothed rolls 8.

A tubular blank shown in FIG. 4 is moved to the first toothed roll pass of the stand 2a whose rolls 8 engage the tubular blank 15 and roll the latter forming on its surface corrugation recesses which, in the cross-sectional plane have the shape of a passage opening 16 (FIG. 5a).

Upon further movement, the blank 15 passes the second pass of the stand 2a after which the corrugation recesses in the cross-sectional plane acquire the shape of a passage opening 17 (FIG. 5b). The passage crosssection areas of the passes decrease in the direction of rolling.

The blank 15 is then upset in the passes of the stands until the desired depth of corrugation is attained. The last pass of stand 2b has a passage opening in the form of a circle 18 (FIG. 5c) and whose diameter corresponds to the required diameter of corrugation recesses.

What we claim is:

1. A device for rolling corrugated tubular parts, comprising a row of series-arranged passes, each pass being defined by a plurality of rolls, the rolls of each pass being arranged to encircle the part being rolled around it's entire periphery, said rolls having concave toothed working surfaces, at least the first of said passes in the direction of rolling being defined by driven toothed rolls, the curvature radii of whose concave surfaces are greater than the radius of a circle inscribed in the pass, and each subsequent pass with respect to the preceding pass being turned about the axis of rolling through an angle insuring the mutual overlapping of butt joint portions of the rolls defining the passes.

2. The device as set forth in claim 1, wherein the passage cross-section areas of the passes decrease in the direction of rolling.

3. The device as set forth in claim 2, including means for adjusting the relative position of the rolls of each pass.

Claims (3)

1. A device for rolling corrugated tubular parts, comprising a row of series-arranged passes, each pass being defined by a plurality of rolls, the rolls of each pass being arranged to encircle the part being rolled around it''s entire periphery, said rolls having concave toothed working surfaces, at least the first of said passes in the direction of rolling being defined by driven toothed rolls, the curvature radii of whose concave surfaces are greater than the radius of a circle inscribed in the pass, and each subsequent pass with respect to the preceding pass being turned about the axis of rolling through an angle insuring the mutual overlapping of butt joint portions of the rolls defining the passes.

2. The device as set forth in claim 1, wherein the passage cross-section areas of the passes decrease in the direction of rolling.

3. The device as set forth in claim 2, including means for adjusting the relative position of the rolls of each pass.

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