A process for making perforating bullet casings by combining hot extrusion and cold stretching

Abstract

The invention relates to the technical field of metal material machining, in particular to a technological method for manufacturing a bullet shell of a perforating bullet through the combination of hot extrusion and cold drawing. By means of the technological method, the machining difficulty of the bullet shell of the perforating bullet is lowered, the product quality is improved, and material consumption of the product is reduced. The technological method includes the steps that a steel bar is selected and heated; cake upsetting and extruding forming are conducted; a formed piece is put into a material column to be soaked with hydrochloric acid or sulfuric acid, washed with water and put into a phosphating solution to be soaked; water washing is conducted again, and an obtained piece enters a saponification solution and then is immersed in boiled water and taken out rapidly to be air dried; bottom pressing is conducted through an oil press, the shape and size of an inner hole are formed, the bottom thickness of the product is lathed through a lathe, and residual materials are cut off; an outer circle and an external cone are lathed to be in the proper size, an antiskid groove and the total length are lathed in place at a time, an R groove of the product is milled, a center hole is drilled, and burrs in the hole are removed; and a small hole for pressing of a lasting fuse is drilled, galvanizing is conducted, and inspecting, packaging and delivering are conducted. The technological method is mainly applied to the aspect of production of bullet shells of perforating bullets.

Description

technical field [0001] The invention relates to the technical field of metal material processing, and more specifically relates to a process method for manufacturing perforating bullet casings by combining hot extrusion and cold stretching. Background technique [0002] Oil and gas well perforation is a key technology in petroleum exploration and development. The function of perforating bullets is to penetrate the casing and cement sheath that seal the target layer downhole and penetrate into the target layer to form an effective seepage flow pipe between the target layer and the well pipe. , to ensure that the oil and gas wells obtain the due production capacity. In addition to the application in oil perforation and well completion, the application of perforating bullets in other aspects is gradually being discovered and used. The perforating bullet casing is the main component of the perforating bullet. The processing technology of the perforating bullet casing is the key...

AI Technical Summary

Problems solved by technology

The disadvantage is that there are many specifications and varieties of raw materials required. According to the size of the perforating bullet casing, various types of steel materials need to be prepared. It is difficult to purchase steel materials, and the annealing time of parts is long, which affects production efficiency. More than 600 tons of hydraulic presses are required, and the mold production cycle It is long, difficult to manufacture, and has strict requirements. It cannot be processed for shells with an outer diameter of 48mm or more, which is not conducive to multi-variety production.

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