About: Breech mechanism   Sponge Permalink

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The Breech mechanism closes and seals the gun barrel's powder chamber after the projectile and powder charge are loaded. The breechblock, the principal part of the breech mechanism, is either a sliding-block or a threaded plug design. The breechblock must open and close quickly while making a high-pressure gas-tight seal. A typical gas pressure approaching 50,000 psi is found in the chamber and gun barrel shortly after the powder charge is ignited.

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  • Breech mechanism
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  • The Breech mechanism closes and seals the gun barrel's powder chamber after the projectile and powder charge are loaded. The breechblock, the principal part of the breech mechanism, is either a sliding-block or a threaded plug design. The breechblock must open and close quickly while making a high-pressure gas-tight seal. A typical gas pressure approaching 50,000 psi is found in the chamber and gun barrel shortly after the powder charge is ignited.
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dbkwik:military/pr...iPageUsesTemplate
abstract
  • The Breech mechanism closes and seals the gun barrel's powder chamber after the projectile and powder charge are loaded. The breechblock, the principal part of the breech mechanism, is either a sliding-block or a threaded plug design. The breechblock must open and close quickly while making a high-pressure gas-tight seal. A typical gas pressure approaching 50,000 psi is found in the chamber and gun barrel shortly after the powder charge is ignited. Weapons smaller than 155mm are usually of one of several sliding-block designs. Larger weapons are usually of one of several interrupted-screw designs. For rapid-fire guns, a sliding breech-block is commonly used which may open and close automatically as the gun is fired. Recent large weapons have incorporated automatic or semi-automatic breechblocks, more than doubling the weapon's rate-of-fire. Using Time On Target methods such as "Multiple Round Simultaneous Impact (MRSI)", one modern 155mm gun can fire eight projectiles, with all eight landing on the same target within four seconds, a task that normally requires firing eight individual guns at the correct calculated times.
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