Crimp Sleeve Over Corrugated Tube

User Pain Point Description

Peter, a product development engineer, wants to develop a novel connection for a corrugated tube to a plastic spigot. The tube carries fluid and therefore the connection needs to allow continuous flow, the max pressure is 10 bar. The tube has a diameter of approx. 20mm. There is no axial force during operation. The corrugation is outside which makes it difficult to clamp and seal. The clamping force needs to be large enough to enable a leak free connection. The connection shall be permanent, not reusable. Preferably only hand tools shall be used for assembly.

AI Interpreted Engineering Challenge

AI analysed the pain point and transformed it into an lean engineering challenge: Design a permanent connection between a 20 mm corrugated tube and a plastic spigot for continuous fluid flow at high load, using polymer-compatible features, assembled with a tool, and intended for static mechanics. The joint must accommodate external corrugation, provide sufficient clamping force for a leak-free seal at up to 10 bar, and require no reusability or axial load capacity during operation.

AI Generated Concepts

Based on the interpretated engineering challenge, AI proposed three different concepts - and this in seconds!

User Selected Concept

Peter reviewed the proposed concepts and decided to go forward with the one idea which best solves his technical pain point.

Crimp Sleeve Over Barbed Spigot

A molded plastic spigot carries two sealing beads and a rear barb profile sized to fit inside the 20 mm corrugated tube bore. The tube end is pushed over the spigot until a hard stop locates it. A separate ductile metal or reinforced polymer crimp sleeve is then placed over the tube OD and compressed with a radial crimp tool. The sleeve has an internal stepped profile so, when crimped, it collapses primarily into selected corrugation valleys, generating high local hoop pressure while avoiding tube buckling. The sealing beads compress the tube liner against the spigot, creating the leak path barrier. Retention comes from mechanical interlock between corrugation valleys, barb faces, and the permanently deformed sleeve.

Pros:

• High clamping force from standard crimp tooling
• Good fit to externally corrugated tube geometry
• Simple load path through sleeve, tube, and spigot

Cons:

• Requires tight crimp process control
• Metal sleeve may affect corrosion specifications
• Permanent assembly cannot be adjusted after crimping

Market potential: high - Familiar crimped hose architecture fits existing assembly lines and addresses many automotive and industrial fluid applications.

Profit-Margin potential: medium - Low part count limits premium pricing, but tooling-compatible reliability supports solid value in volume production.

User Requested Concept Refinement

Refinement: Peter wants to increase the crimp sleeve length - direction indicated by red arrow - by 50% in direction of the arrow. Nothing else needs to be changed.

AI Updated Prototype Geometry

AI Generated 3D-Printable STL

The refined concept looked ready to be 3D-printed. Peter used AIdeator's STL generation feature to create a printable 3D model from the selected concept image. Only a few seconds later, he received the STL file, downloaded and printed it.

AI Generated OpenSCAD File

Peter liked the 3D-printed concept, it gave him a good first idea of a possibel solution coudl look like. In order to further optimize it and to change specific features, Peter let AIdeator to create a parametric OpenSCAD file automatically based on the STL file.

Engineering Assessment by the User

<strong>Such a fast concept generation, I am impressed!</strong> Peter was amazed by the speed and quality of the generated concepts. Although the concept might not be 100% ready for production, it is a great starting point for further development. Being given three concept options and then being able to quickly optimize and print them, is a significant advantage.