Projectile Ogive Connection via Threaded Through-Bolt and Form-Fitting Element
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Solution Overview
Problem
The existing technologies for connecting artillery projectile casings and ogives face challenges with high manufacturing complexity, material strength requirements, and assembly effort due to the need for precise threaded connections and high torque applications, which can lead to thread failure and increased logistical and cleaning efforts.
Innovation Solution
A threaded through-screw connection is introduced between the ogive and the bullet casing, featuring a cylindrical extension with a defined thread and a screw ring, allowing for internal screwing and reducing the need for high-strength materials, while form-fitting elements prevent relative rotation and stress-dependent deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded connection is used to connect the ogive to the projectile casing, then the connection can be assembled, but the manufacturing complexity and assembly effort increase due to the need for precise threads and high torque application
Solution Approach 1:
The connection system is divided into two functional parts: a threaded connection component for assembly and a form-fitting element for operational stability. This segmentation allows the threaded part to handle assembly requirements while the form-fitting element handles spin acceleration stability, reducing the complexity requirements for each individual component.
Solution Approach 2:
The form-fitting element acts as an intermediary between the threaded connection and the spin acceleration forces. It prevents relative rotation during spin acceleration without requiring the threaded connection to withstand high torque, thereby reducing manufacturing precision requirements for the threads.
2Strength
If high-strength materials are used to withstand high torque during spin acceleration, then connection stability is improved, but material requirements and manufacturing difficulty increase
Solution Approach 1:
The requirement for high connection strength during spin acceleration is extracted from the threaded connection and transferred to the form-fitting element. The threaded connection only needs to provide assembly functionality, while the form-fitting element provides the strength and anti-rotation functionality during operation, allowing use of standard materials.
Solution Approach 2:
The form-fitting element is designed beforehand to prevent relative rotation between the ogive and projectile casing during spin acceleration. This pre-established protective mechanism eliminates the need for the threaded connection to withstand high torque, reducing material strength requirements.
3Reliability
If precise threaded connections are manufactured to prevent thread failure, then connection reliability is improved, but manufacturing precision requirements and cleaning efforts increase
Solution Approach 1:
The form-fitting element serves as an intermediary that prevents relative rotation between connected components. This eliminates the need for high-precision threads to prevent loosening under torque, as the form-fitting element mechanically prevents the rotational movement that would cause thread failure.
Solution Approach 2:
The design converts the potential harm of imprecise threads (loosening under torque) into a benefit by using the form-fitting element to prevent the underlying cause (relative rotation). The threaded connection only needs to provide assembly functionality, not withstand operational torques.
4Quantity of substance
If the projectile casing has a thin wall thickness to accommodate high payload, then payload capacity is improved, but the available space for connecting components is reduced
Solution Approach 1:
The form-fitting element is nested within the existing projectile casing structure, utilizing the internal geometry of the ogive and casing rather than requiring additional external space. This allows the anti-rotation functionality to be integrated without increasing overall dimensions or compromising payload capacity.
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
This solution simplifies the assembly process, reduces material requirements, minimizes cleaning and bonding efforts, and ensures reliable connection stability under spin acceleration, preventing thread failure and overloading, thus enhancing the robustness and reliability of the projectile.
Implementation Method 1
The tightening torque of the components to be joined, i.e. the ogive to the projectile casing, is a further manufacturing challenge. The torque to be applied depends on the moments of inertia of the components and the maximum spin acceleration.
Data Source
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AI summary
A projectile (10) is proposed, comprising a projectile part (4) and an ogive (1) that can be attached to the projectile part (4). The ogive (1) can be connected to the projectile part (4) by means of a threaded through-bolt connection. The ogive (1) has a cylindrical extension (5) which includes a thread (7) in a definable area (6). The thread (7) can be a fine thread or a thread profile. A screw ring (3) can be screwed onto the cylindrical extension (5). A positive-locking element (2, 9) can be integrated between the ogive (1) and the projectile part (4). In one embodiment, the integration is such that the positive-locking element (2, 9) is located between an end face (11) of the ogive (1) and an end face (12) of the projectile part (4). A ring (2), in particular a friction ring (9), is also provided as a positive locking element (2, 9). However, the two end faces (11, 12) can also themselves be the positive locking element or...include a profile on the surface.