Magnetic Scattering-Based Detection Technology for Inner Surface Wear of Rifled Gun

doi:10.12382/bgxb.2022.0346

Abstract

Abstract:

To meet the requirement of wear detection of the inner surface of the barrel during the use of the rifled gun, a magnetic scattering model of the inner surface wear of the rifled gun was established, and a detection method for the inner surface wear of the rifled gun was studied. In the geomagnetic environment, based on the magnetic dipole model, the two-dimensional magnetic dipole model of the rifling wall on both sides of the land was analyzed, and the scattered magnetic field distribution models of the bore, the guide side, the ablation groove, the coating and other wear is deduced. The variation law of the magnetic field distribution of the barrel’s inner surface wear was obtained by simulation. A hardware-in-the-loop simulation test was carried out for the wear detection of the rifling. The experimental results showed that when the land was not worn, the difference between the magnetic field strength of the land and the groove was 17.6 A/m; when the land wear was 56.15%, the magnetic field strength difference was reduced to 1.78 A /m. The proposed method provides a rifling wear inspection theory and method for the delivery and use of barrels.

Key words: rifle wear, bore wear, rifling magnetic field distribution, magnetic dipole model, magnetic field distribution inside the barrel

LI Kai, ZHOU Shichao, WEN Peng, SUN Jiangang, GONG Qingqing, LI Yuan, HAN Yan. Magnetic Scattering-Based Detection Technology for Inner Surface Wear of Rifled Gun[J]. Acta Armamentarii, 2023, 44(3): 748-756.

Figures/Tables 14

Fig. 1 Schematic diagram of the angle between the geomagnetic field and the barrel

Fig. 2 Two-dimensional magnetic dipole model at the groove

Table 1 Rifling wear characteristics

磨损原因	磨损分类	磨损特点
机械磨损	内膛磨损	膛线的阳线部分高度降低
机械磨损	导转侧磨损	膛线的阳线变窄
热化学烧蚀	局部烧蚀沟	在阴线部分出现凹槽
热化学烧蚀	镀层磨损	阳线的磨损具有随机性和不对称性

Fig. 3 Schematic diagram of rifling wear

Fig. 4 Two-dimensional magnetic dipole model of rifling wear

Fig. 5 Schematic diagram of the geomagnetic field applied by the gun barrel

Table 2 Wear amount set by simulation

磨损类型	磨损量设置
内膛磨损	将右侧膛线向下磨损Δh为0.3 mm
导转侧磨损	将右侧膛线向右磨损Δa设置为0.15 mm
烧蚀沟磨损	在阴线底部正中位置设置一条长2 $Δ a =0.3 mm$ ，深 $Δ a =0.3 mm$ 的烧蚀沟
镀层磨损	在阴线右侧将阳线棱角打磨成弧形，最大磨损处磨损量约0.3 mm

Table 2 Wear amount set by simulation

磨损类型	磨损量设置
内膛磨损	将右侧膛线向下磨损Δh为0.3 mm
导转侧磨损	将右侧膛线向右磨损Δa设置为0.15 mm
烧蚀沟磨损	在阴线底部正中位置设置一条长2 $Δ a =0.3 mm$ ，深 $Δ a =0.3 mm$ 的烧蚀沟
镀层磨损	在阴线右侧将阳线棱角打磨成弧形，最大磨损处磨损量约0.3 mm

Fig. 6 Magnetic field intensity distribution around the muzzle under different wear conditions

Fig. 7 y-axis magnetic field strength under the change of the magnetic inclination angle I (D=90°)

Fig. 8 y-axis magnetic field strength under the change of magnetic declination D (I=0°)

Fig. 9 Calibration cylinder model parameters

Fig. 10 Diagram of the experimental setup

Fig. 11 Rotation experiment results

Table 3 Details of changes in magnetic field strength at worn parts

磨损量/mm	阳线到阴线的磁场变化/(A·m^-1)
0	-17.6
0.25	-8.48
0.82	-2.13
1.37	-1.78

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