SU1729661A1 - Method of making hollow axisymmetric articles - Google Patents

Abstract

The invention can be used in the manufacture by rotational drawing of vessels consisting of a thin-walled glass and a neck, for example, an internal and external flasks of a thermos. The method is carried out as follows; The initial cylindrical billet is mounted on a mandrel with a thrust base surface and subjected to rotary stretching to obtain a thin-walled glass, the initial billet is mounted on a conical mandrel and a rotary throat is carried out. Then, the open end of the glass and the base of the neck are trimmed, the nodules are formed in these places, they are checked and coated on the outer and inner surface, depending on the purpose of the vessel. In this case, during the rotational stretching of the neck, an additional forming of the centering cone at the base is carried out, and the shaping of the bulges is performed simultaneously with the rotational stretching of the cylinder and the neck by making sections with a reduced diameter on the mandrel. 1 hp f-ly, 3 ill. sl C

Description

The invention relates to the processing of metals by pressure, in particular, can be used in the manufacture by rotational drawing of vessels consisting of a thin-walled glass and a neck, for example, an internal and external flasks of a thermos.

The purpose of the invention is to improve the quality of the vessel, reducing its weight and the complexity of manufacturing.

FIG. 1-3 depicts the implementation of the proposed method of manufacturing parts.

The essence of the method is as follows. The initial blank for the cup T with the wall thickness Ti and the blank for the neck 2 with the wall thickness T2 are installed with an emphasis on the base surface on the corresponding inner profile parts of the mandrel 3 and 4, which have lowered steps 5 and 6 on the working surface corresponding to thickenings at the open the end of the cylindrical cup and the base of the neck, followed by rotational stretching. In the process, a thin-walled cup 7 with a given wall thickness t c and a thickening 8 at the open end is obtained. In this case, the choice of the length I of the thickened section and the height of the lowered step Hi provide a guaranteed clearance Z between the obtained inner surface di and the main surface of the mandrel d al.

Mri rotary stretching of the billet for the neck image / yut cone 9 with wall thickness t “and internal thickening 10 with prices |

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triangular cone 11 at the base of the neck. In this case, the stage on the mandrel is lowered by the value of H2, approximately equal to the thickening at the open end of the glass, i.e. H2 - ty, and the initial diameter d n of the centering cone is approximately equal to the outer diameter of the end of the glass, i.e. dH DH. The angle ai of the centering cone is provided with a profile of a mandrel or a profile of a ruler (not shown) defining the trajectory of movement of the deforming rollers 12.

After rotational drawing, the open end is cut at the glass obtained, and at the neck the base of the centering cone is cut to obtain the specified linear dimensions of the vessel.

When assembling parts for welding (Fig.2a). The open end of the glass is inserted into the centering cone up to the stop at the end of the internal neck thickening, after which welding is carried out and vessel 13 is obtained. In this method, vessels 14 can be produced, consisting of a whole-deformed body & as a neck mated to a long thin-walled cylinder, one-piece connected to the bottom part (fig.2b):

If necessary, a coating is applied on the given surfaces of the obtained vessel, for example, on the outer surface 15 of the inner flask and the inner surface 16 of the outer flask of the thermos flask (FIG. 3) ..

In the manufacture of vessels by the proposed method, it is possible to apply the coating on the surfaces of the original blanks, and in the process of rotational drawing, simultaneously with thinning of the part wall, reduce the coating to a predetermined thickness.

To reduce the weight of the vessel and save metal, such as stainless steel, preforms for glass and for the neck are obtained with a wall thickness in the range of 0.8-1.2 mm. Rotational drawing of the cup and the cone of the neck is carried out with a degree of deformation of at least 50%. At the same time, a wall thickness of less than 0.5 mm is obtained, and at lowered sections of the mandrel, rotational stretching is carried out with a degree of deformation of no more than 40%. at the same time form a thickening of 0.7-1.0 mm.

PRI me R. 1. Manufacturing glass.

From the original round sheet blank with a thickness of 1.0 mm and a diameter of 230 mm in three pressing operations (cutting-forming, first drawing, second drawing), a preliminary billet of glass was obtained. Workpiece dimensions: ®,, 0 mm, length 115 mm. The rotary stretching was carried out on a model B-245 rolling machine. The workpiece is mounted on a mandrel with a diameter of 103.95 mm donp. At a length of 173.0 mm from the end, which is the base

surface for the installation of the workpiece, is located undervalued by a height of 3 mm. Processing modes: deformation scheme of two rollers, straight; mandrel rotation speed 780 rpm

0 longitudinal roll feed 100 mm / min. The result was a glass with a thin-walled cylinder with a thickness of 0.42 mm and a thickening of 0.7 mm at the open end with a length of I / 10 mm. The height of the inner bulge is 0.3-0.5 mm, the outer diameter at the end of the cup is 105.6.

The degree of deformation on a thin-walled cylinder was

1 -0,42

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Claims (2)

one , and on a thickened 20 1 -0.7 nominal area 100% 30%. 2, Making the neck. From the original round sheet blank with a thickness of 1.0 mm and a diameter of 115 mm in one pressing operation (punching-forming) a preliminary preparation for the neck was obtained. Workpiece dimensions: flange diameter 115, 87 mm, thickness, 0 mm, diameter of the base surface, 65 mm, height base surface 3.0 mm. The rotary stretching was carried out on a model B-245 rolling machine. The workpiece is mounted on a conical mandrel with an apex angle of 40 ° (). Low stage located on the cone at the interface of the cone with the cylinder at a length of 55.8 mm from the end of the mandrel. The diameter of the adjoining cylinder 105.6m3 1 is equal to the initial diameter of the centering conical surface of the neck. Step height 0,7 - o.G mm. Processing modes: two-roller deformation scheme, straight: mandrel rotation speed of 780 rpm; longitudinal feed of rollers 80-100 mm / min. as a result, a neck with a cone at the top of 40 ° (“20 °) with a length of 58 mm was obtained. internal thickening with a height of 0.65 mm on the size of 55.8 mm from the base surface and a centering cone at the base with an initial internal diameter of 105.6; the angle of inclination of the conical surface to the axis of the part is 10 °. 2.5 mm long. The degree of deformation on the cone parts, on a thickened area of 10%. After rotational stretching was carried out trimming the ends, assembly and welding of the glass with the neck. As a result, a vessel with specified geometrical dimensions and with required quality to the outer and inner surface. This method of manufacturing hollow axisymmetric parts can be implemented on any machines and devices for rotational drawing with single-roll, multi-roll, forward and reverse deformation schemes. The implementation of the proposed method of manufacturing hollow axisymmetric parts allows a significant expansion of the range of metal vessels used for various consumer goods obtained by the rotary stretching method. At the same time, a reduction in the laboriousness of their manufacture and the saving of metal in the creation of lightweight vessel structures will be achieved, which will provide a great national economic effect. A method of manufacturing 1. A method of manufacturing hollow axisymmetric parts, such as an internal and external flask of a thermos flask, in which the initial billet is mounted on a cylindrical mandrel with an abutting base surface and subjected to rotary stretching to obtain a glass thin-walled cylinder, the initial billet is mounted on a conical mandrel and a rotational stretching of the neck is carried out, cutting is performed on the open end of the glass and the base of the neck, the formation of thickenings in these places, their welding and ix coating on the outer and inner surfaces, depending on the intended use of the vessel, characterized in that, in order to increase the quality of the container and reduce the complexity of manufacturing, in the process of rotational drawing of the mouths, additional shaping of the centering cone at the base is carried out, and shaping of the thickenings produced simultaneously with the rotational drawing of the cylinder of the cup and the cone of the neck by making sections with an underestimated diameter on the mandrel. 2. The method according to claim 1. exe and bout By the fact that, in order to reduce the mass of the vessel due to obtaining a wall thickness of the glass and the neck less than 0.5 mm, for the original blanks, a material with a wall thickness of 0.8-1.2 mm is used, rotational stretching the cylinder of the cup and the cone of the neck are carried out with a degree of deformation of at least 50%, and thickened areas of not more than 40%. Fig.Z Compiled by TDDolkacheva Editor M.Kobyl nska Tehred M.MorgentalKorretorM.Tovtin