SU1696050A1 - Method of progressive lateral corrugation of tubular blanks - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to the manufacture of corrugated products with different cross sections. The purpose of the invention is to improve the quality of finished products by improving the conditions of deformation. A device for carrying out the method comprises a working mandrel and an inductor. The mandrel is made in the form of a central stock, clamping, in hollows and elastic inserts. The diameter of the inserts is less than the internal diameter of the workpiece by a double height of the formable corrugations. The mandrel is inserted inside the workpiece. An inductor is installed outside the workpiece. The inserts act on the inner surface of the workpiece with a pressure that causes elastic stresses in the workpiece material. The inductor generates an alternating magnetic field and creates pressure on the workpiece. The blank is crimped into the gap between the inserts. Elastic inserts create a backbone that prevents movement of the workpiece material in the radial direction. The method allows the molding of rifts to be crimped with large degrees of deformation. 3 il. Ne Ё

Description

The invention relates to the processing of metals by pressure, in particular to the manufacture of corrugated products with different cross sections.

The aim of the invention is to improve the quality of the finished products by improving the molding conditions.

FIG. 1 shows a working mandrel of an apparatus for carrying out the method; FIG. 2 shows a device prior to molding; in fig. 3 is the same at the end of molding.

A device for carrying out the method comprises a working mandrel 1, a unit 2 for creating an external deforming pressure, for example, an inductor.

The device mandrel consists of a central rod 3, a clamp 4, a sleeve 5 and

elastic inserts 6. The thickness of the sleeve 5 determines the pitch of the formable corrugations. The diameter of the inserts 6 is less than the internal diameter of the workpiece 7 to double the size of the formed corrugations.

The method is implemented as follows.

The working mandrel is inserted inside the workpiece 7, and an outside inductor is mounted, connected to a magnetic-pulse installation. The working zone of the inductor is placed in the middle of the sleeve 5. After that, a force directed against each other is applied to the rod 3 and the clamp 4, as a result of which the elastic inserts 6 are compressed axially prior to contact with the workpiece. Inserts 6 impact

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They are pressed onto the internal surface of the workpiece with a pressure that causes elastic stresses in the workpiece material. Thereafter, a discharge of the magnetic-pulse installation through an inductor is produced, as a result of which the alternating magnetic field generated by it creates pressure on the workpiece. Under the action of this pressure, the preparation is crimped into the annular gap between the elastic inserts 6. The elastic inserts 6 create a backing that prevents the free movement of the workpiece material in the radial direction. In addition, tensile tangential stresses created by inserts in the workpiece cause a change in the stress state in the deformation zone, which leads to the appearance of additional tensile axial stresses, as a result of which the buckling of the material occurs at high degrees of crimping.

After forming corrugations elastic

insert 6 due to its own elasticity

return to the starting position. The tubular workpiece 7 is moved axially by a distance equal to the pitch

molded corrugations and the formation of subsequent corrugations.

The cross-sectional shape of the stem 3, the clamp 4, the elastic inserts b and the inductor may be different. Therefore, this method can be used when corrugating blanks of various cross sections.

Example. Tubular billet - honey. on a pipe f 50 x 0.5 mm. The diameter of the elastic inserts in the initial position is 42 mm. Inserts made of polyurethane SKU7. Inserts are compressed with a screw press. The squeeze force is measured by the dynamo center. The corrugations are formed by a single-turn inductor with a 3.5 mm working area width connected to the MIU-20/1 magnetic-pulse unit. Pitch molded bumps 11 mm. their height is 3.5 mm; The required discharge energy is 3.24 kJ. No loss of stability of the material in the deformation zone is observed.

The method allows the molding of rifts to be crimped with large degrees of deformation.

Claims (1)

Claims The method of transverse successive corrugation of tubular blanks by creating a backwater from the inner surface of the blank and molding the corrugations into the inner blank by lengthening, characterized in that, in order to increase the quality of the finished products by improving the molding conditions; the backwater is performed in the zones of the tops of the formable corrugations on both sides of the moldable cavity by the mandrel with elastic inserts whose diameter smaller than the internal diameter of the workpiece by twice the height of the molded corrugations, while the elastic inserts are compressed to create elastic stresses in the tubular blank. 4 5 6 5 / / $ glhch  j ///////////////. THOSE one / 1 1