CS199076B1 - Pressure bottle and method of its manufacture - Google Patents

Description

When calculating the wall thickness of the cylinder, the calculated wall thickness is replaced with the lowest value of the pipe thickness, ie after deduction of both tolerance and creep. Cylinders made of metallurgically produced tubes mean unnecessary waste of material during production and unnecessary weighting of increased weight when transporting compressed gases.

The prior art process of closing from tubes, from the starting metallurgical tube, is carried out by successive die forging while the tube is rotated or also on rotary forging machines.

The disadvantage of the unevenness of the wall thickness, which was already at the starting pipe, is thus maintained, which also preserves the disadvantage of higher excess weight. In addition, all forging methods have the disadvantage that any material defects, such as double material, are even more concealed by the forging and usually only occur during the pressure test, i.e. after the unnecessary work on the bottle has been spent.

These disadvantages are substantially eliminated by the cylinder according to the invention, which is based on the fact that my different wall thickness at the bottom and lid relative to the

199 076

199 076 of the housing part, wherein the transition of the thinner wall of the housing to the thicker wall of the bottom and lid is continuous, straight, curved or graduated.

The essence of the method of manufacturing a cylinder according to the invention is that the tube wall is reduced by ringing on the mandrel to the smallest extent at the beginning and end of the tube and at most in the future sleeve network, the wall being refined by thickness tolerance. hot forging to the bottom and lid.

In particular, the effects of the invention result in less material consumption, reduced weight, and improved product quality. In carrying out the process according to the invention, the concealed defects arising in the manufacture of the tubes, such as rolled material, double walls, diapers and the like, which are not capable of rotational reduction, are safely exposed. This precludes, at the start of the production of cylinders, those cylinders which would not pass the pressure test and, if they still survive, could mean a possible later accident.

An example of the invention can be seen in the attached drawing, in which Fig. 1 shows a cylinder in cross section of a variable wall thickness with a straight transition, Fig. 2 - cylinder in cross section of a variable wall thickness with a curved transition; Fig. 4 - Pressure cylinder in section with variable wall thickness with annular reinforcement at the shell outside or inside the bottle, Fig. 5 - Pressure cylinder in section with variable wall thickness in unconventional design, where reinforcement Fig. 6 - reduced tube with variable wall thickness for a conventional bottle, Fig. 8 - reduced tube with variable wall thickness for an unconventional bottle.

The cylinder according to the invention consists of a thickened bottom 1 of a continuous transition 2 or a graduated transition g of the weakened casing 6, a continuous transition 6 to the reinforced lid 6 or a graduated transition g to the thickened lid 6 terminated by a neck 8. bottles are made outside or inside the shell. The variation of the wall thickness need not alter the outer contour of the bottle.

The unconventional design retains the usual internal shape and transition 2 * of the reinforced bottom 1 ‘into the weakened housing 4 'transition 5 5 into the reinforced lid 6 *. Possible annular reinforcement of the sheath 6 goes outward.

The starting tube 10e is reduced by rolling or rolling on a mandrel to a variable wall thickness of the tube, with an inward reinforcement 11 for the bottom 1 and a reinforcement 12 outside for the lid 6. The reinforcement of both ends 1g and 14 outside is intended to make the cylinder unconventional.

The cylinder and the method of its manufacture are particularly suitable for cylinders of long and larger size, where savings of up to 30% on the weight of the batch material can be achieved. It is also advantageous for special purposes and materials of low weight, such as in medicine, for diving and rescue work and the like.

199 076 according to the invention

Claims (5)

The object of the invention A pressure cylinder, in particular a metal, for compressed gases, formed from a pipe, characterized in that it has a different wall thickness at the bottom (1) and the lid (6) with respect to the bulk of the sheet. A cylinder according to claim 1, characterized in that the transition of the thinner wall of the liner into the thicker wall of the bottom (1) and the lid (6) is continuous, linear, curved or graduated. A cylinder according to claims 1 and 2, characterized in that the shell wall has one or more annular thickenings (9). 4. The method of producing a cylinder according to claim 1, wherein the tube wall is reduced by ringing on the mandrel to the smallest extent at the beginning and end of the tube, and most in the future part of the cylinder housing, the wall being refined by thickness tolerance. the reinforced, open ends of the tube are closed by hot forging to form the bottom and the lid. 5. A method for producing a cylinder according to claim 4, characterized in that the bottom or lid is closed by ringing or punching. 8 drawings