Mid Lock-Up Receiver Sleeve Segmentation for Accuracy
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Solution Overview
Problem
The manufacturing of mid lock-up receivers is costly and results in a less rigid receiver due to lug ways continuing forward of the abutments, affecting rifle accuracy, as conventional methods are more economical but less accurate compared to mid lock-up designs.
Innovation Solution
An improved mid lock-up receiver design featuring an elongated cylindrical body with a compressively received sleeve, where the sleeve is thermally bonded to the body, allowing radiused bolt lugs that eliminate the need for costly EDM machining and ensure lug ways terminate at the midpoint, enhancing receiver rigidity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional rear lock-up manufacturing is used, then manufacturing cost is reduced and ease of manufacture is improved, but rifle accuracy deteriorates
Solution Approach 1:
The receiver is divided into two separate components: the main receiver body and a sleeve component. The sleeve is received within the receiver body and contains the lug ways that terminate at the abutments. This segmentation allows the lug ways to be precisely formed in the sleeve without requiring costly EDM machining of the entire receiver, while still achieving the accuracy benefits of mid lock-up design.
Solution Approach 2:
The sleeve acts as an intermediary component that mediates between the manufacturing process and the final accuracy requirement. By forming lug ways in the sleeve rather than directly in the receiver, the design achieves precise lug way termination at the abutments without requiring expensive EDM machining, thus improving accuracy while maintaining manufacturing economy.
2Ease of manufacture
If mid lock-up design with lug ways continuing forward of abutments is used, then manufacturing is simplified, but receiver rigidity deteriorates and accuracy is reduced
Solution Approach 1:
The receiver structure is segmented into the receiver body and a separate sleeve. The lug ways are formed only in the sleeve and terminate at the abutments, while the receiver body maintains its structural integrity without lug ways extending forward. This segmentation provides both the manufacturing simplicity of conventional designs and the rigidity benefits of mid lock-up design.
Solution Approach 2:
The lug ways are extracted from the receiver body and placed in the sleeve instead. This extraction allows the lug ways to terminate at the abutments without extending forward into the receiver body, thereby maintaining receiver rigidity while still enabling economical manufacturing through the sleeve component.
3Manufacturing precision
If mid lock-up design is implemented, then rifle accuracy is improved, but manufacturing cost increases due to costly EDM machining
Solution Approach 1:
The receiver is segmented into a receiver body and a separate sleeve component. The expensive-to-machine lug ways are formed only in the sleeve using conventional machining processes, while the receiver body is manufactured separately without requiring costly EDM operations. This segmentation achieves mid lock-up accuracy at reduced manufacturing cost.
Solution Approach 2:
The sleeve acts as a disposable or replaceable component that contains the precision-lug-way features. Instead of investing in expensive EDM machining of the entire receiver, the precision features are concentrated in the cheaper sleeve that can be manufactured using conventional, more economical processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design allows for economical production of mid lock-up receivers with increased accuracy and rigidity, reducing manufacturing costs and overcoming the accuracy disadvantages of prior art mid lock-up receivers.
Implementation Method 1
The sleeve may be thermally bonded to the body
Data Source
AI summary
Mid lock-up receivers have an elongated cylindrical body, the body defining a passage, the body having a first rear portion and a second forward portion adjacent to and forward of the rear portion, the first rear portion defining a first passage segment having a first diameter and the second forward portion defining a second passage segment having a second diameter greater than the first diameter, a forward facing step surface defined at a forward face of the first rear portion, an elongated cylindrical sleeve defining a sleeve passage and received in the second passage segment, the sleeve having a rear end spaced apart from the step surface, and the sleeve being compressively received in the body wherein the body is in tension about the sleeve, and the sleeve is compressed by the body. The sleeve may be thermally bonded to the body.