Abstract
High temperatures and exposure to the chemical effect of powder gases that accompany artillery salvos actively destroy the surface layer of a barrel channel material. This disrupts the geometry of a barrel channel, thereby reducing the accuracy of an artillery gun aimed firing. We have proposed a technology of surface plastic deformation of the channel inner surface for strengthening the barrels of large caliber artillery and tank guns. The strengthening implies the cold-work hardening of a barrel channel metal with spherical deforming bodies that are mounted onto a massive cylindrical reinforcer. During machining, the reinforcer is driven into a rolling motion over the treated inner surface of a barrel channel and moves along the geometrical center of the machined gun’s barrel. As a result of such a hardening treatment, the residual compression stresses form in the thickness of a barrel channel material, thereby improving its surface microhardness. That contributes to an increase in the resistance of a barrel channel material against its burn-out and wear during artillery salvos.The reinforcing equipment for the implementation of such a treatment includes a reinforcer in the form of a cylinder with deforming bodies, an electric motor of the drive, and a mechanism to transfer the torque from the motor shaft to the reinforcer. During strengthening treatment, the set-up moves along a gun barrel channel, cold-working its material. The ensured hardening thickness is 0.15‒0.20 mm.The hardened surface layer of a gun barrel material, due to the heightened microhardness, firmly opposes the formation of operational microcracks within it. The compression stresses, formed in the thickness of a barrel channel metal, resist the temperature propagation of microcracks. Owing to this, the resistance of the hardened barrel metal against operational destruction increases, thereby improving the reliability and durability of costly artillery armament.
Highlights
The barrels of artillery guns, along with a pointing shooting sighting system, are one of the most important components of the gun, which ensures the range and accuracy of a sighting shot, and defines the durability of the gun in general
We have analyzed operational loads acting on a mate rial of the artillery gun barrel channel
It was established that the high temperatures and pressures that accompany gun shots form the operational stretching stresses in the thickness of a barrel channel material
Summary
The barrels of artillery guns, along with a pointing shooting sighting system, are one of the most important components of the gun, which ensures the range and accuracy of a sighting shot, and defines the durability of the gun in general. At each shot from a gun, the surface layers of its barrel channel metal are exposed to the destructive active effect of high-temperatures (up to 1,000 °C), the chemical action from powder gases, superhigh pressure, and mechanical wear caused by a shell moving along the barrel. It is a relevant task to undertake studies into the development of innovative technological processes aimed at improving the reliability and durability of artillery weapons Those include, for instance, new technological processes intended to increase the resistance of a gun barrel material to operational loads that manifest themselves during shooting. One of these fields of research is the development of a technology to enhance the strength characteristics of the surface layer of a barrel channel material
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