Gun Barrel Milling with Keyed Clamping for Faster Alignment
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Solution Overview
Problem
The existing method for manufacturing gun barrels is laborious and time-consuming, requiring frequent loading and unloading of the workpiece, which leads to misalignment and increased production time, typically taking around 18 hours.
Innovation Solution
A method utilizing a 5-axis CNC milling machine to machine a metal billet with an elongate key, allowing the workpiece to remain clamped and unmoved throughout the process, reducing manual handling and enabling faster, more accurate production of gun barrels with variable geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the workpiece is loaded and unloaded multiple times during machining operations, then the machining process can be completed in stages, but the production time increases significantly and misalignment risk increases
Solution Approach 1:
The workpiece is segmented into multiple barrel sections that are machined simultaneously from a single billet, allowing each barrel to be processed independently while maintaining overall alignment through the shared mounting key and rigidity block structure
Solution Approach 2:
An elongate key is machined into the workpiece beforehand, which serves as a permanent alignment reference that eliminates the need for repeated positioning and clamping operations during subsequent machining stages
2Ease of manufacture
If traditional machining operations are used with frequent workpiece handling, then multiple machining steps can be performed, but the overall manufacturing time extends to around 18 hours
Solution Approach 1:
Multiple machining operations that would traditionally be performed separately on individually handled workpieces are merged into a single continuous process where all barrel sections remain clamped to the same rigidity block throughout all machining steps
Solution Approach 2:
The rigidity block with mounted barrels serves multiple functions simultaneously: it acts as a mounting fixture, an alignment reference, and a structural support for all machining operations, eliminating the need for multiple specialized fixtures
Data Source
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AI summary
A method for forming a set of gun barrels, comprises: machining an elongate key along a length of a metal billet; mounting the metal billet on a machining jig, clamped along the key; performing CNC milling operations on the mounted metal billet in a 5-axis CNC milling machine to form a set of gun barrels having a pair of bores and a rib, the rib extending lengthwise proximate the elongate key; and, separating the set of gun barrels from the key along the length of the rib section. The present invention provides for significantly faster machine production with no manual handling of the workpiece throughout the milling operations. This makes the milling operations more accurate as the workpiece remains in position throughout, without reloading. Holding the workpiece along a key which runs the length of what will become the rib of the barrels avoids any loading of the workpiece in areas that need to be machined. The use of a 5-axis CNC milling machine allows for variable geometries to adjust the finished shape and configuration of the gun barrels.