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

An assembly process and interference technology, which is applied in the large interference assembly process field of the rotating drug chamber and the inner bore, can solve the problems of inner bore performance changes, cold and brittle inner bore, and difficulty in cooling the inner bore, and achieve assembly Accurate and reliable results

Active Publication Date: 2020-05-15
CHONGQING WANGJIANG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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...

Method used

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

Examples

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Embodiment 1

[0035] Embodiment 1, the inner hole diameter is 81.98mm rotating drug chamber 2 and the outer diameter is 82.23mm inner bore 1 is assembled. The inner bore 1 with an outer diameter of 82.28 to 82.23mm shrinks in diameter by 0.12 to 0.13mm after being cooled by liquid nitrogen; the rotating drug chamber 2 can be calculated according to the formula:

[0036]

[0037] It can be calculated how much the inner hole of the rotating drug chamber 2 can expand theoretically after heating, where α is the change of the outer diameter or inner diameter, K is the linear expansion coefficient of the material, D1 is the diameter of the inner hole before heating, and T2 is the dry The required heating temperature set by the box, T1 is the room temperature before heating. In the case of a room temperature of 30°C, if the rotating drug chamber 2 is heated to 350°C, according to formula 1), it can be calculated that the diameter of the inner hole of the rotating drug chamber 2 after heating ca...

Embodiment 2

[0038] In the second embodiment, the rotating drug chamber 2 with an inner hole diameter of 81.9 mm and the inner bore 1 with an outer diameter of 82.2 mm are assembled. In the case of a room temperature of 30°C, if the rotating drug chamber 2 is heated to 350°C, the diameter of the inner hole of the rotating drug chamber 2 after heating can theoretically be enlarged by 0.29877mm, and the diameter of the inner bore 1 can theoretically be calculated according to formula 1). The shrinkage is about 0.1mm, so in theory, the rotating drug chamber 2 can be heated to 350°C to complete the assembly. Put the rotating drug chamber 2 into a QX841-2 drying oven and heat it to 350°C, and keep it warm for 3 hours, and put the inner chamber 1 in a liquid nitrogen tank for cooling treatment, and keep it warm for 3 hours; The hole actually expanded to 82.2mm, which was expanded by 0.3mm, and the outer diameter of the inner bore 1 actually shrank to 82.1mm after cooling, which was reduced by 0....

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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...

Claims

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Application Information

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IPC IPC(8): B25B27/02B25B11/02
CPCB25B27/026B25B11/02
Inventor 彭凌波陈施有罗忠坤刘琴
Owner CHONGQING WANGJIANG IND
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