A kind of method utilizing friction stir welding to prepare copper elastic belt

Abstract

The invention provides a method for preparing a copper bearing band through friction stir welding so as to solve the problem that according to a copper bearing band prepared through an existing build up welding method, because great stress concentration and severe permeation crack defects can be caused in a copper alloy build up welding layer when iron enters the copper alloy build up welding layer, the strength of a connector of the copper bearing band and a steel base body is remarkably lowered. The method includes the steps that firstly, the preset position A on a cannonball shell is sleeved with a copper ring; secondly, the copper ring is pressed towards the cannonball shell in the radial direction through a band collection machine, the copper ring is tightened, the cannonball shell is clamped on a friction stir welding workbench through a clamp, and meanwhile the copper ring is clamped on the cannonball shell; thirdly, welding is conducted, wherein a friction stir welding machine is started, a stirring head is pressed in the copper ring, the cannonball shell is driven by the clamp to rotate around the axis of itself, the copper ring also rotates, and welding is completed after the cannonball shell rotates by a circle; and fourthly, after welding is completed, repair welding is conducted on a keyhole through a filling type friction stir welding method, and preparation of the copper bearing band is completed at the moment. The method is used for preparing the copper bearing band.

Description

technical field [0001] The invention relates to a method for preparing a bullet belt in the shell manufacturing process, in particular to a method for preparing a copper bullet belt by friction stir welding. Background technique [0002] The belt is one of the main components of the shell, and it is widely used in shells of various sizes. Its main function is to seal the powder gas and make the shell rotate, while increasing the range, improving the accuracy, and reducing the wear of the rifling. The traditional method of producing the belt is the mechanical fitting method, which is to process the guide belt groove on the projectile body (the large-caliber shell is a dovetail groove), and roll the pattern on the bottom of the groove, so that the copper alloy or pure iron belt Fitted with the body under strong pressure. This traditional processing method not only takes a lot of time, but also causes serious wear on the tool. It also increases the wall of the shell, reduces t...

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Problems solved by technology

[0003] The present invention solves the copper elastic belt prepared by the existing overlay welding method. When iron enters the copper alloy overlay welding layer, it will cause great stress concentration and serious penetration crack defects in the copper alloy overlay welding layer, so that the copper elastic belt and The joint strength of the steel matrix is ​​significantly reduced; not only that, but the pan-iron produced increases the hardness of the bullet belt sharply, and it is easy to scratch the rifling when the shell is fired, which shortens the service life of the gun bore. Methods

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