SU948501A1 - Method of producing vessels with doubled walls and narrow neck - Google Patents

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture of vessels with double walls and narrow necks, such as thermoses, cryostats, etc. The closest to the proposed technical essence and the achieved effect is a method of manufacturing vessels with double walls and a narrow mouth. sheet blanks, including the operation of stretching, dispensing and joining along the ends of the elongated hollow semi-finished products 1.

However, when using this method, the vessels are of poor quality due to the large number of welds, do not meet sanitary requirements, which is explained by the presence in the inner cavity of the weld, and a lot of material is required for manufacturing.

The purpose of the invention is to improve the quality, operational reliability and economy of the material.

To this end, when carrying out the method of manufacturing vessels with double walls and a narrow neck from sheet blanks, including the operation of drawing, distributing and joining along the ends of the elongated hollow semi-finished products, an outlet is formed in the center of one of the blanks; at the bottom, the package of blanks is stretched and after the semi-finished product is joined, pressure is applied at the ends from the inside until the inner

10 to a layer of semi-finished product of the dimensions of the internal cavity of the finished vessel, after which the bottom of the outlet is cut off, and the distribution of the semi-finished product is carried out by applying pressure simultaneously to its

15 internal cavity and into the gap between the layers.

Figure 1 is a section of a package of blanks; Fig. 2 is a sectional view of a semifinished product obtained after stretching; on

20 fig. 3 - section of the semi-finished product after the distribution of its inner layer to the size of the internal cavity of the finished vessel and trimming the bottom of the outlet .; Fig, 4 - received vessel with double

25 walls in the cut.

For the manufacture of a vessel with double walls, two blanks 1 and 2 are polished on a plane. After that, a branch 3 is formed on the blank 2 in the center. A package is assembled from these blanks and jointly pulled out in a few transitions; at the same time, the workpiece with a tap should be located below. After the obtained semi-finished product has been joined, pressure is applied from the inside to the ends to give the inner layer the dimensions of the internal cavity of the finished product. The bottom of the outlet is cut off, and the semi-finished product is distributed by applying pressure simultaneously to its internal cavity and to the gap between the layers. Example. Production of vessels with double walls with a narrow mouth.

For the manufacture of the proposed method, an all-metal thermos with an inner diameter of the outer shell of 190 mm, an inner diameter of the inner shell of 172 mm and an inner diameter of 370 mm, and a thickness of 0.8 mm made of steel 12X18H10T. In the center of one of the blanks, a branch with an inner diameter of 14 mm and height b mm is pulled out. After that, a package of these blanks is assembled and, over four transitions, a two-layer semi-finished product with an inner diameter of 100 mm and a height of 320 mm is placed, the blank is placed with a downward heat treatment (quenching for austenite) in argon after each transition, and is joined at layers of argon-arc welding.

A two-layer semi-finished product is distributed in two transitions with a distribution coefficient of 1.35 and 1.27 to an internal diameter of 172 mm, leaving the neck not deformed. Thermal treatment (quenching for austenite) is carried out in argon after each transition. Cut off the bottom of the outlet. The fluid supply pipe is welded to the outlet.

Then, to distribute the semifinished product, a liquid is pumped into the core simultaneously into its internal cavity and into the gap between the layers.

Using the proposed method of manufacturing a double-walled vessel, such as a thermos or cryostat, allows:

- improve the quality and operational reliability of double-walled vessels by reducing the number of welds;

-significantly save material.

Claims (1)

1. US patent No. 3331522, kl.215-13 07/18/67 (prototype).  XXXU U U O UHHH 1  I Wy / / y / A xxx / y / gl / Feg.g i / f.J yg Phgg.