A large interference assembly process for rotating medicine chamber and inner chamber

Abstract

The invention relates to a large interference assembling process of a rotating drug chamber and an inner bore, comprising the following steps: 1) Put the rotating drug chamber into a drying oven and heat it to 300-400°C, and keep it warm in the drying oven At least 2 hours; 2), put the inner chamber into a liquid nitrogen tank to cool to -196°C, and keep it warm in the liquid nitrogen tank for at least 2 hours; 3), take the heated rotary chamber out of the drying oven , and measure whether the diameter of the inner hole of the rotating drug chamber after heating meets the requirements, and then put the rotating drug chamber that meets the requirements into an assembly tool for positioning; 4), take the cooled inner bore out of the liquid nitrogen tank, and measure Whether the outer diameter of the inner bore after cooling meets the requirements, and then insert the inner bore from the guide hole of the assembly tool, so that the press-in end of the inner bore is aligned with the inner hole of the rotating medicine; 5), apply pressure to the inner bore, within 30 seconds The inner bore is completely press-fitted into the inner hole of the rotating medicine chamber, and the interference fit assembly is formed after the rotating medicine chamber and the inner bore return to 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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