Fiber Reinforced Resin Screw Thread Strength
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Solution Overview
Problem
Resin screws lack strength in their threads, particularly when the engagement length of male and female screws is shortened, limiting their application in fields requiring higher strength, such as those needing chemical resistance, corrosion resistance, biocompatibility, explosion proof properties, light weight, and heat retention.
Innovation Solution
A fiber reinforced resin screw with a longer thread pitch (1.5 to 2 times the standard pitch) and average fiber length (1 to 1/3 times the pitch) is developed, using reinforcing fibers like glass or carbon fibers in a resin composition, which enhances the strength of the threads and allows for improved resin flow orientation during injection molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resin screw is used to achieve chemical resistance, corrosion resistance, biocompatibility, explosion proof property, light weight, and heat retention, then these properties are improved, but strength is insufficient compared to metal screw
Solution Approach 1:
The patent applies composite materials by combining thermoplastic resin with reinforcing fibers (glass fiber, carbon fiber, aramid fiber, or ultra-high molecular weight polyethylene fiber) at optimized content rates of 20-80%, which significantly enhances the strength of the resin screw while preserving its inherent chemical resistance, corrosion resistance, biocompatibility, explosion proof properties, and heat retention
Solution Approach 2:
The patent optimizes multiple parameters including pitch (1.5 to 2 times standard pitch), fiber length (1 to 1/3 times the pitch), and fiber content rate (20-80%) to achieve the desired strength level while maintaining the advantageous properties of resin materials
Data Source
AI summary
The present invention is relates to a fiber reinforced resin screw 10, 20 shaped using a resin composition containing reinforcing fiber in a resin. A pitch of threads has a length of 1.5 to 2 times of a standard pitch corresponding to an outer diameter of the threads prescribed in standards of a metric coarse screw, a unified coarse screw and a unified fine screw. An average fiber length of the reinforcing fiber is 1 to 1/3 times of the pitch of the threads in the fiber reinforced resin screw. A content rate of the reinforcing fiber is in a range of 20 to 80%. In this way, the fiber reinforced resin screw to have improved is provided in the strength of the thread.