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Multiple-extrusion forming cartridge case machining method

A processing method and cartridge case technology are applied in the field of multiple extrusion molding cartridge case processing, which can solve the problems such as the inability to accurately determine the inner hole volume of the cartridge case, the excessive machining allowance of the inner hole, and the uneven wall thickness of the cartridge case.

Inactive Publication Date: 2017-11-17
重庆千迈机械制造有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention mainly solves the problems existing in the prior art such as uneven wall thickness of the cartridge case, inability to form a vase-shaped or spindle-shaped inner hole, a large amount of machining allowance in the inner hole, especially the inability to accurately determine the volume of the inner hole of the cartridge case, etc.

Method used

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  • Multiple-extrusion forming cartridge case machining method
  • Multiple-extrusion forming cartridge case machining method
  • Multiple-extrusion forming cartridge case machining method

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Embodiment Construction

[0020] Below by embodiment, in conjunction with accompanying drawing, technical scheme of the present invention is specifically described as follows:

[0021] Such as figure 1 As shown, the finished product 1 of the cartridge case is a thin-walled concave shell whose lower end is closed and the upper end is open, and the outer diameter and inner diameter are both spindle-shaped or bottle-shaped. The bottom 2, the transition section 3, the positioning section 4 and the opening 5 components, wherein the inner and outer diameters of the positioning section 4 are cylindrical.

[0022] Such as figure 2 The processing process shown consists of the following steps:

[0023] Step (1) Heating after cutting off the material, cutting such as figure 2 The cylindrical rod blank shown in the figure is heated to 1150 to 1200 degrees Celsius for later use. The selected raw material can be 40Cr round steel suitable for hot forging, and various heating methods such as medium frequency indu...

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Abstract

The invention discloses a multiple-extrusion forming cartridge case machining method. The multiple-extrusion forming cartridge case machining method includes the following steps: (1) material cutting and heating; (2) initial pressing forming; (3) forming extrusion; (4) shape-fixing extrusion; (5) turning and eccentricity correction; (6) closing extrusion; and (7) machining forming. The initial pressing forming step can allow easy extension of the forming extrusion; the inner diameter and the outer diameter of an opening portion are less than that of a central spindle-shaped structure through the multiple-extrusion steps and the closing forming step, the thickness of a wall of the cartridge case is more even, the volume of an inner hole of the cartridge shell is improved, normalizing and cold extruding can be avoided, and the machining complexity is lowered.

Description

technical field [0001] The invention relates to a processing method of a bullet casing, in particular to a processing method of a multiple-extrusion molding bullet casing. Background technique [0002] In the prior art, the processing method of the cartridge case is casting. Due to the pores, loose structure and inhomogeneity in the casting wall, the product consistency is poor. [0003] In addition, in the prior art, there is also a processing method of one-time hot extrusion, or alternate molding of hot extrusion and cold extrusion. For example, the Chinese invention patent application with the publication number CN103286534A discloses a method of manufacturing a projectile hole shell The process includes the following steps: (1) intermediate frequency heating, heating the round steel to between 1150 and 1200 degrees Celsius by means of intermediate frequency heating; (2) blanking; (3) piercing, so that the center of the round steel head forms a spherical depression (4) S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/22
CPCB23P15/22
Inventor 钱宗富
Owner 重庆千迈机械制造有限公司