SU1255242A1 - Versions of tool unit for moulding pipelines with screw corrugations - Google Patents

Abstract

1. A tooling unit for forming pipelines with screw corrugations from tubular blanks, containing a hollow matrix with a screwed groove of variable pitch on a working surface having a semi-cylindrical bottom, and with forming rollers installed in the groove, rings mounted on both sides of the matrix ends, as well as a mandrel coaxially arranged with a matrix with a conical working surface having a larger diameter on the supply side, characterized in that, in order to improve the quality of the products, it is provided The ends of the rings are chained, the rollers are mounted into chain links, the working surface of the matrix is made conical with a large diameter on the feed side, the depth of the screw grooves of the matrix is made g constant and with a bottom radius exceeding the edge radius of the forming rollers, and on the inner cylindrical surface of each ring screw groove constant pitch. (L GO ate Cd t49 i4 to Fig. /

Description

2. The unit according to claim 1, 1 and 2, with the fact that it is equipped with two cylindrical sleeves with helical grooves of constant pitch on the outer surface mounted on a mandrel against the rings, and an additional chain with forming The roller grooves on the outer ends of the sleeves, and on the working surface of the mandrel there is a screw groove for the 1-curved rollers, similar to the helical groove on the die.

3. A pipe forming unit with screw corrugations from tubular blanks containing a conical mandrel, a treadmill with a screw groove having a variable pitch and the invention relates to a tooling for metal forming and can be used for the manufacture of metal pipe bending with screw corrugations.

The purpose of the invention is to improve the quality of manufacture of the product by means of rolling and crimping the surface of the workpiece.

Fig, 1 shows the snap in, the form of a matrix having a forming rollers and a mandrel (option I); in fig. 2 - the same, the forming rollers are mounted on the mandrel (option 1a,) j in FIG. 3, the equipment in the form of a mandrel with forming rollers (option) J in FIG. 4, is a part of the chain from the chi roller; in FIG. 5, a section, A-A in FIG. 4.

Instrumental block, F1 forming pipelines with screw corrugations according to option I contains a hollow matrix 1 with a variable groove groove on a conical working surface, the groove having a semi-cylindrical bottom fixed on both sides of the ends of the ring 2 and 3c with a helical groove of a constant pitch on the inside surface mounted coaxially with the mandrel 4 with a conical working surface, and the chain 5 with the rollers 6 mounted into its links, mounted on

; gutsilindricheskaya bottom mounted on the side track rollers, characterized in that, in order to improve the quality of products, it is equipped with two cylindrical sleeves with helical grooves on the outer surface mounted on the ends of the mandrel and a chain fixed on the outer ends of the sleeves, rollers mounted in chain links, and the bevel track is placed on the surface of the mandrel, while the depth of the groove is constant, the radius exceeds the edge radius of the forming rollers, and the mandrel is smaller in diameter on the feed side sheepdogs.

the outer ends of the rings 2 and 3 (not shown).

The maximum diameters of the die and mandrel are located on the supply side of the tubular billet, the depth of the groove on the die is constant and has a bottom radius exceeding the edge radius of the forming rollers.

The tool block for option I can be equipped with two cylindrical sleeves 7 and 8 with screw grooves of constant pitch: on the outer surface mounted on the mandrel 4 against the rings 2 and 3, located on both sides of the ring 1, on the outer ends of the plugs 7 and 8 (not shown) fixed chain 9 with the forming rollers 6.

The tool block according to variant II contains a conic mandrel 4, on which a running track with a helical groove of variable pitch with a field I of a horizontal pitch is made.

the bottom, two cylindrical sleeves 7 and 8 screw grooves on the outer surface, mounted on the ends of the mandrel 4, chain 5 with rollers 6 mounted into its link.

The chain 5 is fixed on the outer ends of the sleeves 7 and 8 (not shown), the depth of the groove on the mandrel 4 is constant, and the bottom radius exceeds the edge radius of the forming ro31

faces, and the mandrel is made with a smaller diameter from the feed side of the workpiece.

P1 instrument unit works as follows.

The tubular billet is fed to the left, its end is mounted on the mandrel and the rotary motion and translational movement are delivered to the billet. When this forming rollers 6, the workpiece is compressed from the outside (option I) or additionally distributed from the inside (option 1a), or only distributed from the inside (option II), form a helical corrugation.

The presence of sections of the helical grooves on the rings and bushings of constant pitch provides the required corrugation pitch, and exceeding the radius of this part of the groove on the die and mandrel above the radius of the edges of the rollers 6. ensures their self-installation. The first version of the tooling is designed to obtain pipelines with screw corrugations by precipitating the pipe from the outer diameter of the workpiece to the diameter of the hollows of the corrugation and is used if it is impossible to structurally place the mandrel inside the pipelines, for example, for Dy 32.40.50 mm.

Another variant of this variant is designed to obtain pipelines with screw corrugations with an equally deformed bottom profile Dy 70.80,90,100,125 mm. In that

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In this case, the diameter of the workpiece is taken equal to the average diameter of the mandrel, while providing the best profile characteristics. 5 The second version of the tooling is designed to receive pipelines with screw corrugations during distribution of the pipe. from the internal diameter of the workpiece to the diameter of the protrusions of the corrugation and, is used in the case when it is structurally possible to place the mandrels inside the pipeline, and the radial rigidity of the pipe is sufficient to form corrugations, for example

15 to Dy 70.80.90 mm with a wall thickness of 0.3 mm.

The use of the proposed instrumental block leads to the fact that the plastic deformation of the material in the process of corrugation has a gradual and continuous nature without sliding rubbing.

In addition, there are no additional harmful materials in the product.

25 deformation and stress, and this leads to an increase in the service life of the pipeline and a decrease in the rejection of microcracks in the weld zone.

Bench testing of pipelines

30 per 70 mm Dy showed an increase in resource by about 1.5 times.

The breakage due to microcracks during the knurling process is 2-3%, instead of 20-30% using the well-known technology used in serial production.

Thebes.2

R

Have

FIG. 4 Arhedactor G. Volkova

Compiled by L.Tkachenko Tehred L.Serdyukova

Order 4746/9 Circulation 733 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, F-33, Raushsk nab., 4/5

Production and Printing Project, Uzhgorod, Projecto st., 4

Proofreader S. Shekmar

Claims (3)

1. The tool block for forming pipelines with screw corrugations from tubular blanks, containing a hollow matrix with a screw groove of variable pitch on the working surface with a semi-cylindrical bottom, and with forming rollers installed in the groove, rings mounted on both sides of the ends of the matrix , as well as a mandrel placed coaxially with the matrix, with a conical working surface having a larger diameter on the supply side, characterized in that, in order to improve the quality of the products, it is equipped with an external the end of the rings with a chain, the rollers are mounted in the links of the chain, the working surface of the matrix is conical with a large diameter on the supply side, the depth of the helical groove of the matrix is made d constant and with a radius of the bottom exceeding the radius of the edge of the forming rollers, and a helical groove is made on the inner cylindrical surface of each ring constant step. SU, „1255242 FIG. / 2. The block according to π.1, characterized in that it is equipped with two cylindrical bushings with screw grooves of constant pitch on the outer surface, mounted on a mandrel against the rings, and an additional chain with forming rollers mounted on the outer ends of the bushings, and a helical groove for forming rollers is made on the working surface of the mandrel, similar to the helical groove on the matrix. 3. A block for forming pipelines with screw corrugations from tubular billets, comprising a conical mandrel, a treadmill with a helical groove having a variable pitch and a (gutsilindrovochny bottom, rollers mounted on the side track, which is designed to increase product quality, it is equipped with two cylindrical bushings with screw grooves on the outer surface mounted at the ends of the mandrel, and a chain fixed to the 'outer ends of the bushings, the rollers are mounted in the chain links, and the δετοί track is placed on the rhnosti mandrel, wherein the groove depth is made constant radius greater than the radius of the edge forming rollers and the mandrel - the smaller diameter from the workpiece.