Rotary medicine chamber and inner chamber large-interference-quantity assembly process

Abstract

The invention relates to a rotary medicine chamber and inner chamber large-interference-quantity assembly process. The process comprises the following steps: 1) a rotary medicine chamber is put in a drying box and heated to 300-400 DEG C, and is insulated in the drying box for at least 2 hours; 2) an inner chamber is put in a liquid nitrogen tank and cooled to -196 DEG C, and is insulated in the liquid nitrogen tank for at least 2 hours; 3) the heated rotary medicine chamber is taken out from the drying box; it is measured whether the diameter of an inner hole of the heated rotary medicine chamber meets the requirements or not; and then, the rotary medicine chamber meeting the requirements is put in an assembly station for positioning; 4) the cooled inner chamber is taken out from the liquid nitrogen tank; it is measured whether the outer diameter of the cooled inner chamber meets the requirements; and then, the inner chamber is inserted in from a guide hole of an assembly tool, so that the pressed-in end of the inner chamber is aligned to an inner hole of the rotary medicine chamber; and 5) the pressure is applied to the inner chamber; the inner chamber is totally pressed into theinner hole of the rotary medicine chamber within 30 seconds; and the rotary medicine chamber and the inner chamber form the interference fit assembly after recovering the normal temperature.

Description

technical field [0001] The invention relates to the technical field of assembly of parts with large interference, in particular to a large interference assembly process of a rotating drug chamber and an inner bore. Background technique [0002] A kind of ammunition with a double-layer drug chamber. The inner bore and the outer rotating drug chamber are assembled together with a large interference fit. The material used for the rotating drug chamber is generally 16Co14Ni10Cr2Mo (AF1410) (G1). This secondary Hardened ultra-high-strength steel materials are expensive and difficult to process, and the inner bore material is generally 00Ni18Co12Mo5T1Al. In the assembly of the rotating chamber and the inner bore, in order to achieve the purpose of increasing the pre-tightening force and ensuring smooth shelling, the interference between the outer diameter of the inner chamber and the inner hole of the rotating chamber is usually required to be 0.3 to 0.35. At present, the assembl...

AI Technical Summary

Problems solved by technology

However, in the practice of using the above two interference fit methods for assembly, it is found in practice that if only the rotating drug chamber is heated, the rotating drug chamber needs to be heated to above 500°C in order to make the heated rotating drug chamber inner hole and A gap of 0.1mm is formed between the outer diameters of the inner bore, but when the temperature of the rotating drug chamber reaches 500°C, there is a problem that the hardness and tensile strength of the rotating drug chamber decrease due to high temperature; if only the inner bore is cooled, then The inner bore must be cooled below -500°C in order to form a gap of 0.1mm between the rotating chamber and the inner bore. However, the current liquid nitrogen cooling technology used in general factories can only reach -196°C, and it is difficult to cool the inner bore. To -500°C, and when the inner bore is cooled to -500°C, the performance of the inner bore will change, and even cause the inner bore to be cold and brittle.

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