SU503701A1 - The method of manufacture of multilayer pressure vessels - Google Patents

Description

METHOD OF MANUFACTURING MULTILAYERED VESSELS

(54) high PRESSURE

This invention relates to metal forming.

A known method of making multilayer vessels at high pressure, allowing for autocoupling of the outer layers; and sequential pressing-in of the internal tapered bushings.

The purpose of the invention is to increase the carrying capacity of the vessel.

This is achieved by the fact that auto-bonding is carried out in the process of pressing the inner sleeve, followed by partially pressing it out by an amount that prevents the occurrence of plastic deformations from the effect of residual stresses.

FIG. 1 shows the position of the vessel details before pressing in; HP of FIG. 2 - the same, after pressing; in fig. 3 - the same, after partial extrusion of the inner sleeve.

In part 1, which is the outer layer of the reservoir and placed on the stand 2, the inner conical sleeve 4 is inserted on the core 3 with 1 additional sleeve 5 coaxially located after it

by pressing them into the inner sleeve 4 from the part 1. As a result of the pressing on the inside of the part 1, the stresses exceed the yield strength of the material of this part and it is plastically deformed. During plastic deformation, hardening of cetal 1 takes place due to deformation hardening of the material. At the same time, the limit of elastic work of the part increases. There is an autobonding of the outer layer. In order to carry out full auto-bonding, one is unloaded, for this purpose, the core is pressed into the inner and additional bushes. As a result of the fact that the tensile force applied to the surface of the part 1 decreases during extrusion, the elastic forces generated by stretching the part tend to return it to its original state. However, plastic deformation, performed in the material, excludes free discharge of the part, as a result of which residual stress relieving occurs on the surface, contributing to additional strengthening of the part. To eliminate the possibility of the formation of secondary plastic deformations under the action of residual stresses, the inner sleeve is partially pressed out by an amount that prevents plastic formations from residual stresses, for example, by the formula; h - 2 (Pa-RSD) G5 (1-K) (.. where: Pb is the self-pinned voltage; p g is the assembly voltage; J. is the radius of the surface of the assembly; is Young's modulus; d is the angle of taper of the surface of the assembly; - coefficient of the thickness of the vessel; - the coefficient of thickness of the inner one - coefficient 4) of the thickness of the outer ring (outer layer);

/////////////// /////////////// 1.G ,, rm - internal, assembly and up to 1i1 radii. The height of the additional sleeve is chosen equal to the amount of extrusion of the inner sleeve. When pressing out, additional sleeve 5 comes out of part 1, Then the core 3 is pressed out of internal sleeve 4 and the same operations are repeated with the next internal sleeve. The invention The method of manufacturing high-pressure multilayer vessels, which includes auto-sticking the outer layers and sequential pressing of the inner conical sleeves, is different from the fact that, in order to increase the bearing capacity of the vessel, the auto-bonding is carried out during the pressing of the inner sleeve with subsequent partial pressing the value excluding the occurrence of plastic deformation due to residual stresses.

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