Making screws by adding head to shaft, presses more ductile head onto pre-formed, profiled shaft, to produce closed, interlocking bond between them

Simple SummaryContent extracted from patent full text and abstract with AI.

This invention describes a process for manufacturing screws by pressing a more ductile, pre-formed head onto a specially shaped shaft. The shaft is made less ductile through Equal Channel Angular Pressing, while the softer head material is pressed onto the shaft so it fills the spaces and forms a tight, interlocking bond, creating a strong, one-piece screw.

Use CasesContent extracted from patent full text and abstract with AI.

• Manufacturing high-strength screws for automotive and aerospace industries
• Producing custom fasteners for machinery or construction
• Making secure bolts and fasteners for electronic devices
• Improving assembly line screw production for greater durability and reliability
• Creating screws specifically for high-vibration or safety-critical applications

BenefitsContent extracted from patent full text and abstract with AI.

• Stronger bond between screw head and shaft compared to traditional methods
• Reduces risk of head detachment under stress
• Enables use of different materials for head and shaft for optimized properties
• Enhances screw durability and longevity
• Scalable for mass manufacturing with improved mechanical properties

Technical Classifications (CPCs)

Inventors & Applicants

Patent Abstract

The shaft metal is deformable and is processed using the ECAP (Equal Channel Angular Pressing) operation. Its ductility is less than that of the screw head metal. A profile is first worked into the screw shaft preform; this includes radial and axial resting surfaces. A pre-formed blank screw head is then pressed onto the shaft, using a tool. The ductile head material fills up the space between the radial and axial resting surfaces in the region of the pressed-on head. In this way, head and shaft are interlocked together and the final form of the headed screw is reached.