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A Plastic Forming Method for Small-sized Hollow and Thin-walled Shell Parts

A thin-walled shell and plastic forming technology, which is applied to weapon accessories, offensive equipment, ammunition, etc., can solve the problems of reducing product quality stability, difficult to control welding heat, and affecting fragment quality, so as to improve penetration resistance and Stability, achieve consistent control of organizational performance, good process stability

Active Publication Date: 2020-10-02
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing turning, stamping and welding processes have the following disadvantages: first, the weld seam is brittle, which affects the quality of fragments; second, the welding heat is not easy to control (weld seam temperature ≥ 300°C), which reduces the stability of product quality; third, production efficiency low cost high

Method used

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  • A Plastic Forming Method for Small-sized Hollow and Thin-walled Shell Parts
  • A Plastic Forming Method for Small-sized Hollow and Thin-walled Shell Parts
  • A Plastic Forming Method for Small-sized Hollow and Thin-walled Shell Parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A plastic forming method for a small-sized hollow thin-walled casing, comprising the following steps:

[0040] (1) Blank preparation: According to the forming part diagram of the hollow thin-walled shell part ( figure 2 ), calculate the volume of the material, and select the appropriate blank size according to the plastic forming theory and the principle of near-uniform plastic deformation, and cut the corresponding bar according to the principle of plastic forming volume invariance. The material grade is 20, and the diameter of the bar is φ12mm. A blank with a size of φ11.2×10.6 mm was prepared by turning. After I lubricant treatment, a lubricating layer is prepared on the surface of the billet.

[0041](2) Thin-walled shell by extrusion: put the billet obtained in step (1) into the cavity of the extrusion die, under the action of three-dimensional compressive stress and deformation rate of 10mm / s, after two passes of extrusion Compression deformation, the depth of ...

Embodiment 2

[0047] A plastic forming method for a small-sized hollow thin-walled casing, comprising the following steps:

[0048] (1) Blank preparation: Calculate the volume of the material according to the formed part diagram of the hollow thin-walled shell, and select the appropriate blank size according to the theory of plastic forming and the principle of near-uniform plastic deformation, and cut the corresponding blank according to the principle of constant volume in plastic forming. The bar, the material grade is 45, the diameter of the bar is φ12mm, and it is prepared into φ11.2×10.6mm through turning. After I lubricant treatment, a lubricating layer is prepared on the surface of the billet.

[0049] (2) Thin-walled shell by extrusion: put the billet obtained in step (1) into the cavity of the extrusion die, and under the action of three-dimensional compressive stress and deformation rate of 15mm / s, extrude through three passes. Compression deformation, the depth of the first extr...

Embodiment 3

[0055] A plastic forming method for a small-sized hollow thin-walled casing, comprising the following steps:

[0056] (1) Blank preparation: Calculate the volume of the material according to the formed part diagram of the hollow thin-walled shell, and select the appropriate blank size according to the theory of plastic forming and the principle of near-uniform plastic deformation, and cut the corresponding blank according to the principle of constant volume in plastic forming. The bar, the material grade is 921A, the diameter of the bar is φ12mm, and it is prepared by turning to φ11.2×10.6mm. After I lubricant treatment, a lubricating layer is prepared on the surface of the billet.

[0057] (2) Thin-walled shell by extrusion: put the billet obtained in step (1) into the cavity of the extrusion die, and under the action of three-dimensional compressive stress and deformation rate of 20 mm / s, extrude through 4 passes Compression deformation, the first extrusion cavity depth is ...

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Abstract

The invention provides a plastic forming method of a small-size hollow thin-wall shell piece. The plastic forming method of the small-size hollow thin-wall shell piece comprises the steps of extrusionforming, carrying out annealing heat treatment, numerical control spinning and sealing, and cutting. The distance between a spin pressing starting point and a shell port is 2 to 3.5mm, the rotating speed of a main shaft is 200 to 300r / min, the rotating speed of a spinning roller is 500 to 850r / min, the feed rate of the spinning roller is 0.05 to 0.1mm, the sealing wall thickness of the port is 1.3+ / -0.15mm, and the temperature of the thin-wall shell piece is smaller than or equal to 120 DEG C. According to the plastic forming method of the small-size hollow thin-wall shell piece provided by the invention, the prepared small-size hollow thin-wall shell piece port is plastically and seamlessly sealed, and the sealing part is uniform in wall thickness, so that the anti-penetration performance and the stability of a hollow thin-wall shell combined armor can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, in particular to a plastic forming method of a small-sized hollow thin-walled casing. Background technique [0002] The liner is the core component of the shaped charge warhead. 98% of the existing armor-piercing warheads use copper liner. A large number of ballistic tests show that the liner made of hot-rolled or extruded copper rod or plate , the average grain size is 10-45 μm, and the armor-piercing penetration power is 8-10 times the charge diameter. At present, the world's advanced anti-tank missiles, such as "Javelin", "Cornet", and "Spike", all use series warheads (two-stage or three-stage series), shaped charges with partitions, large-caliber Charges, new military explosives, etc., have improved the damage capability of anti-tank missiles. [0003] Armor protection and anti-armor ammunition contradict and promote each other, thus developing high-performance armor systems s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00F42B33/00
CPCB23P15/00F42B33/00
Inventor 舒大禹陈强赵强胡传凯吴洋赵祖德夏祥生屈俊岑王长朋李辉
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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