A method of manufacturing cylinders

 

(57) Abstract:

Use: treatment of metals by pressure. The inventive method includes heating the ends of the workpiece and the rolls. Then do the heat treatment of the workpiece and one of the operations of the internal surface cleaning termomassazhnye. Next, perform shot blasting the inner surface and application of a fluoropolymer coating.

The invention relates to the processing of metals by pressure and can be used in machine building industry in the manufacture of cylinders designed for storage and transport of compressed and liquefied gases, in particular bottles to be used as automotive fuel tanks.

Known methods of manufacturing containers of hot-rolled billet firmware in hot condition, followed by forming a "Cup", and then the neck of the container (US patent N 3948073, CL 21 D 21/24, 1976). Sheet blanks by means of deep drawing cold (U.S. patent N 4148208, class B 21 D 22/20, 1972), as well as from a tubular piece forming the bottom and the neckline (Kaparovich Century, the Running-in of hardware in production. M. Engineering, 1973).

Naitove, degreasing the inner surface of the balloon preform, shot blasting the inner surface and enamel, baking enamel, heat the end of the workpiece and the sealing plate, heating the other end of the workpiece and the sealing cap, heat treated cylinder, machining neck and hydrotesting (ed.St. USSR N 1754298, class B 21 D 51/24, publ. 1992).

The technical result of the invention the improvement of the quality of the container and increase the productivity of the process.

The method comprises the following process steps: pipe is cut into blanks, heat up one end of the billet and rolled the bottom, after heating the second end of the workpiece roll neck, then thermoablative cylinder, conduct blasting cleaning of the internal surfaces are coated (fluoropolymer), burn it, make the machining of the neck and hydrospatial the container.

P R I m m e R. the Making of a cylinder capacity of 50 l of the pipe h,5 mm, steel HM.

The pipe is cut on the balloon preform length 1720 mm Balloon preparation served in a heating device, such as inductor for heating one end of the workpiece to 1200aboutC. Then the workpiece with the heated end is served in Zack is guilt. After that, the container is fed to the heat treatment regime: heating at 900aboutC for 40 min with subsequent cooling in water. Simultaneously with the heat treatment container is termomassazhnye inner surface. Then the balloon serves to position shot blasting, where the inner surface of the cylinder is freed from the dross and her pridetsja roughness Rz40. Then the container arrives at the position of the coating, where its inner surface is applied fluoropolymer coating, for example, the powder in an electrostatic field. As the fluoropolymer powder is used, for example, Teflon brand LD-1-400. After applying a layer of powder realize it melt at 350aboutC for 4 min and get a coating thickness of 100 μm. Then the balloon is supplied to the operation of machining the neck, hydrotest and next cycle.

The test results of the proposed method in comparison with the prototype showed that the quality of the indoor coverage has improved, the marriage because of the discontinuity of coverage has decreased in 2 times, process productivity increased by 13% due to the consolidation of operations termoeletricidade and heat treatment, as well as for controversely workpiece, the coating on the inner surface, heating the ends of the workpiece and sealing by forming on one end of the bottom, and the other cap, wherein the first carry out heating of the ends of the workpiece, sealing, then simultaneously perform heat treatment of the workpiece and one of the operations of the internal surface cleaning her termomassazhnye, then perform another operation of cleaning the inner surface shot blasting, next to the internal surface applied fluoropolymer coating.

 

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