Resin Gear Tooth Cutting After Molding for Precision and Durability
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Solution Overview
Problem
Existing methods for producing gears from fluid materials, such as resin, face challenges in achieving the required accuracy for gear devices while maintaining cost advantages, as dimensional variations occur during molding, affecting the durability and abrasion resistance of the gears.
Innovation Solution
A method involving an intermediate product forming process where a fluid material is solidified to create a gear intermediate product, followed by a tooth forming process using cutting techniques to achieve high accuracy and precision, specifically using injection molding or compression molding with resin materials containing reinforcing fibers like carbon fibers, and cutting techniques like grinding to form teeth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a gear is produced by solidifying a fluid material (injection molding), then production cost is reduced and productivity is improved, but manufacturing precision deteriorates due to dimensional variations during molding
Solution Approach 1:
The gear production process is divided into two distinct stages: (1) intermediate product formation by solidifying fluid material through injection molding, and (2) tooth formation by cutting the intermediate product. This segmentation allows each stage to be optimized independently - the first stage achieves high productivity and cost efficiency, while the second stage ensures high manufacturing precision for the gear teeth.
Solution Approach 2:
The gear intermediate product is formed in advance through injection molding with the tooth grooves preliminarily shaped. This preliminary action creates a near-finished product that requires only the final tooth cutting operation, combining the advantages of moldable material forming (high productivity) with precision cutting (high accuracy).
2Manufacturing precision
If carbon fiber length is reduced to 100 μm or less, then manufacturing precision of small gears is improved, but strength and durability may deteriorate
Solution Approach 1:
Different regions of the gear are assigned different carbon fiber lengths according to their functional requirements. The tooth portions, which require high precision, contain short carbon fibers (100 μm or less) to minimize dimensional variation. The root portions and other non-critical areas contain longer carbon fibers to maintain strength and durability. This local differentiation resolves the contradiction between precision and strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for the production of gears with high accuracy and durability, reducing production costs while maintaining the benefits of fluid material molding, enabling the creation of bending meshing type gear devices with improved operational accuracy and reduced weight.
Implementation Method 1
an intermediate product forming process of solidifying a fluid material to form a gear intermediate product
Data Source
AI summary
Provided is a method for producing a gear including an intermediate product forming process of solidifying a fluid material to form a gear intermediate product, and a tooth forming process of cutting the gear intermediate product to form teeth.