Screw Chip Removal Structure for Wood Cracking Prevention
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Solution Overview
Problem
Conventional screws cause wood cracking due to excessive pressure and require high torque for screwing, leading to operator injury and compromised product safety.
Innovation Solution
A screw design featuring a tapering tail section with two or more chip removal grooves, arranged at varying inclination angles and widths, to improve chip removal capability and reduce screw-in torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional screw with a single V-shaped chip removal groove is used, then the screw structure is simple, but the chip removal capability is poor and wood cracking occurs due to excessive pressure
Solution Approach 1:
The single V-shaped chip removal groove is segmented into multiple chip removal grooves (first, second, and third grooves) with different orientations and positions. This segmentation divides the chip removal function across multiple grooves, improving overall chip removal capability while distributing the stress to prevent wood cracking.
Solution Approach 2:
Different chip removal grooves are designed with different local characteristics - the first groove has a specific angle for initial chip removal, the second groove is positioned at a different angle for additional chip removal, and the third groove provides further chip removal capability. Each groove is optimized for its specific location and function.
2Ease of operation
If a conventional screw with a single chip removal groove is used, then the manufacturing process is simple, but the screw-in torque is excessively large causing operator injury
Solution Approach 1:
The chip removal function is segmented into multiple grooves that work together to reduce resistance during screwing. The multiple grooves create more efficient chip ejection paths, reducing the torque required to drive the screw into the wood while maintaining secure fastening.
Solution Approach 2:
The chip removal grooves are arranged asymmetrically with different angles and positions relative to the screw axis. This asymmetric arrangement optimizes chip removal efficiency and reduces screw-in torque by creating favorable stress distribution patterns during the screwing operation.
3Object-affected harmful factors
If a conventional screw with a single V-shaped chip removal groove is used, then the groove geometry is simple, but wood cracking occurs compromising product safety
Solution Approach 1:
The stress and chip removal function are segmented into multiple grooves positioned at different angles. This segmentation prevents stress concentration in a single location, distributing the mechanical loads more evenly across the wood material and preventing crack propagation.
Solution Approach 2:
Each chip removal groove is designed with specific local geometric properties - different angles, positions, and orientations - to address local stress conditions in the wood. This localized optimization prevents cracking by ensuring that stress is distributed favorably across different regions of the wood material.
Data Source
AI summary
Disclosed is a chip removal structure of a screw. The screw includes a screw head. A shank extends downward from the screw head. The shank has an outer circumferential surface on which a thread is formed in a surrounding form. The shank has a lower end that is formed with a tapering tail section. The thread is extended to the tapering tail section. The tapering tail section is formed, through cutting or pressing, with two or more chip removal grooves. The spacing distance of the chip removal grooves can be adjusted as desired. The chip removal grooves are set at an inclination angle and any one of the chip removal grooves may exceed or may not exceed a screw center line. The chip removal grooves on the left side are each 0.5 to 4.5 times in width of the chip removal grooves on the right side.