SU747593A1 - Winding process monitoring method - Google Patents

Description

(54) SURPRISE MONITORING PROCESS CONTROL

one

The proposed method is intended for use in power engineering, chemical engineering and other branches of the national economy in the manufacture of nuclear reactors, pressure vessels, chemical apparatus, columns, etc.

The expediency and necessity of using multi-layered shells in critical structures due to their valuable performance and manufacturing methods, which are highly processable and cost effective, are now generally recognized. The combination of lamination with the high mechanical properties of the material of small thickness, which constitute the shell, made the multilayer structures reliable to the surface and crack propagation.

At the same time, owing to the adverse effect of gaps between the layers, as stress concentrates on one side and reducing carrier

ability, on the other hand, the question of their measurement is one of the most important in the manufacture of a multilayer structure

CII,

The magnitude of the stresses arising in the multilayer structure, as well as the heat transfer conditions, substantially depend on the size of the gap between the layers. These gaps are one of the main factors that determine the carrying capacity of the reactor, vessel, i.e. the quality of its manufacture. Therefore, determining the size of the gap in the shell manufacturing process and the possibility of actively influencing its size are important characteristics.

15 manufacturing technology responsible structures.

A method is known for controlling the process of winding a strip preform along a spiral trajectory in the manufacture of multilayer structures, in which the density of adherence of the layers to each other is determined 1. By a known method, air is pumped out of the gaps between the layers. Argon is then introduced into this space. The amount of injected gas at certain parameters is the approximate value of the sum of the volumes of the gaps between the turns. However, the amount of argon injected into the interturn clearances is not constant, it depends on the conditions for filling narrow gaps, as well as on the degree of compression of gas in individual channels. Therefore, at the factory, the gap between the turns is practically not measured during the manufacture of the multi-layer shell, which does not allow one to estimate the load-carrying capacity of the product. The purpose of the invention is to increase the reliability of the process control coil winding a strip blank, which makes it possible to increase the reliability of the design. The goal is achieved by determining the distance between the outer surfaces of the adjacent layers and the thickness of the rolled strip to determine the density of the layers to each other, in case of exceeding the difference in these allowable limits, the winding process 1 (SI blanks are stopped. Example of how the winding is shown strip blank along a spiral trajectory with a pitch, a large width of the strip with its simultaneous pressing and tension. Fig. 1 shows the winding process in two projections; Fig. 2 - installation of sensors. Sensors 1, measurement The thickness of the rolled strip is mounted on a plazusche suspension 2, which has the ability to move in space with the strip 3. Then the sensors 4 are mounted, mounted on a traverse that is connected to the base of the unit 6, intended for the manufacture of the multilayer product 7. The sensors 4 are placed in the gap between the edges of the strip to be rolled in. The traverse can move in the vertical direction in order to increase the diameter of the shell. A second group of sensors 8 is placed on the same traverse, which support the outer surface of the welded section of the strip. Thus, sensors 4 and 8 make it possible to measure the dissipation between the outer surfaces of adjacent layers. The sensor readings do not depend on the spatial position of the crosshead. which may vary depending on the size of the product and its inaccuracy of mounting relative to the central axis. The size of the gap between the layers {, as the difference between the readings of the sensors 4 and 8 and the measured thickness of the winding strip, determines the equipment efficiency, which, in case of exceeding the allowable value of the interlayer gap, automatically gives the command to stop the process of manufacturing the product. The insignificant 3 1 gaps between the layers, which can occur in a multi-layer construction due to deviations of the crowd strip along its width and length as a result of the imperfection of the rolling equipment, are brought to a minimum value by process crimping with a minimum value by process crimping with part before the plastic state. This operation eliminates the residual welding stresses and reduces the uneven distribution of stresses across the wall thickness,. which positively reflects the strength of the structure. The use of the proposed multilayer construction method provides the following advantages: it makes it possible to control the quality of production of a multilayer shell, sphere, lid and bottom practically at the minimum allowable gaps by adjacent layers; the reliability of the multilayer structure is enhanced by drastically reducing the stress concentrates associated with the interlayer gaps, which are automatically recorded in the form of the records necessary to compile a passport for the product being manufactured. Formula of the invention A method for controlling the winding of a strip preform along a spiral path in the manufacture of multilayer structures, in which the density of layers arriving to each other, different to TGM, is determined, which, the distance between the outer surfaces of the adjacent 574 layers and the thickness of the rolled strip, in case of exceeding the difference of these values of permissible limits, the process of winding the strip blank is stopped. Sources of information taken into account in examination 3 1. Korolev E, M., et al. Experimental studies of the stress state of coiled high pressure vessels. Collection of scientific works NIIHimmash, vol. .63. Rolled pressure vessels, M., 1973, p. 1O2-105.

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Claims (1)

Claim A method of controlling the process of winding a strip billet along a spiral path in the manufacture of multilayer structures, in which they determine the abutment density of the layers to each other, characterized in that, in order to increase the reliability of control to determine the abutment density of the layers to each other, measure the distance between the outer surfaces of cm layers and the thickness of the winding strip, if the difference between these values of the allowable limits is exceeded, the process of winding the strip billet is stopped.