Waved Thread Screw Segmentation Reduces Torque
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional screws with sawtooth threads enhance cutting efficiency and prevent loosening, but there is a need for improved screwing efficiency and reduced torque while maintaining locking ability.
Innovation Solution
A screw design featuring a shank with spirally disposed threads, including a first and second threaded section with interlaced segments and a wave-shaped directrix, where the upper and lower flanks converge to form multiple peaks for enhanced drilling power and reduced torque, and the wave-like surface improves locking to prevent loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional screws use interlaced thread portions in sawtooth shape to increase cutting area, then screwing speed is enhanced, but the torque required for screwing remains high
Solution Approach 1:
The thread is divided into multiple thread portions (first, second, third, and fourth thread portions) that are interlaced in a sawtooth pattern around the shank. This segmentation allows multiple peaks to engage the workpiece simultaneously, distributing the cutting load and reducing the torque required while maintaining high screwing speed.
Solution Approach 2:
The thread portions are arranged in a three-dimensional interlaced configuration around the shank, creating multiple peaks that engage the workpiece at different angular positions. This spatial arrangement increases the effective cutting area and drilling power without proportionally increasing the torque requirement.
2Productivity
If conventional screws use interlaced thread portions to increase cutting area, then screwing speed is enhanced, but the screw may still loosen or drop out during operation
Solution Approach 1:
The thread is segmented into multiple interlaced thread portions that create numerous peaks engaging the workpiece simultaneously. This segmentation provides multiple locking points, enhancing the screw's resistance to loosening and dropout while maintaining high screwing speed.
Solution Approach 2:
The thread portions are configured with curved surfaces that conform to the workpiece geometry, creating friction-based locking. The interlaced arrangement of multiple curved thread portions provides redundant locking mechanisms, ensuring the screw remains securely fastened during operation.
3Ease of manufacture
If conventional screws use simple thread geometry, then the structure is simple to manufacture, but the drilling power is insufficient for rapid screwing
Solution Approach 1:
The thread is segmented into multiple portions arranged in an interlaced sawtooth pattern, creating multiple peaks that engage the workpiece simultaneously. This segmentation significantly increases the drilling power and cutting efficiency while remaining manufacturable using conventional thread rolling or cutting processes.
Solution Approach 2:
The thread geometry parameters are optimized by creating interlaced thread portions with specific pitch, depth, and angular arrangements. These parameter changes enhance the drilling power and cutting area without requiring complex manufacturing processes, as the pattern can be achieved through standard threading operations.
Data Source
AI summary
A screw with wave thread including a head, a shank extending therefrom, and a thread spirally disposed on the shank; in particular, the thread has respective first and second threaded sections. Each thread unit of the second threaded section defines a continuous wave-shaped directrix around the shank for a base. A plurality of thread segments are formed on each thread unit of the second threaded section, and each of which has an upper flank as well as a lower flank extended from the shank and disposed along the wave shape directrix to form into a wavy arrangement around shank, thereby disposing more peaks converged by the upper flank and the lower flank for increasing the drilling capability.