Broaching Cutter Staged Cutting Blade Geometry
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Solution Overview
Problem
Conventional broaching cutters experience high abrasion and metal particle loss due to the obtuse angles on the first cutting blade, leading to reduced tool life and efficiency in forming internal teeth.
Innovation Solution
The broaching cutter incorporates initial, intermediate, and final cutting blade stages with progressively deeper cutting depths and curved or chamfered distal end corners, reducing abrasion by distributing the cutting load and enhancing edge strength, particularly in the intermediate and final stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the first cutting blade has an obtuse angle or right angle with large cutting depth for rough cutting, then the cutting efficiency is improved, but metal particles are easily dropped off and high degree of abrasion occurs on the cutting blade
Solution Approach 1:
The broaching cutter divides the cutting process into multiple stages: initial cutting blade stages with smaller cutting depths for rough cutting, and final cutting blade stages with larger cutting depths for finish cutting. This segmentation allows each stage to perform its specific function optimally while reducing overall abrasion on the initial cutting blades.
Solution Approach 2:
The patent applies different geometric characteristics to different parts of the cutting blade. The initial cutting blades have smaller cutting depths and specific distal end corner shapes, while the final cutting blades have larger cutting depths. This local differentiation optimizes both rough cutting efficiency and reduces abrasion on critical edges.
2Productivity
If the first cutting blade has large cutting depth for rough cutting, then the material removal rate is improved, but the cutting blade experiences high abrasion and metal particle loss
Solution Approach 1:
The cutting process is segmented into initial and final cutting blade stages. The initial stages perform rough cutting with controlled cutting depths, while the final stages complete the cutting with larger depths. This segmentation distributes the cutting load and reduces metal particle loss on the initial cutting blades.
Solution Approach 2:
The initial cutting blade stages perform preliminary rough cutting to remove the majority of material before the final cutting blade stages perform the finish cutting. This preliminary action reduces the burden on subsequent stages and minimizes abrasion on the initial cutting blades.
3Length of moving object
If the distal end corners of cutting blades have obtuse angles for rough cutting, then the cutting depth is increased, but the cutting edges are more susceptible to abrasion and particle drop-off
Solution Approach 1:
Different distal end corner geometric characteristics are applied to different cutting blade stages. The initial cutting blades have specific distal end corner shapes optimized for rough cutting with reduced abrasion, while the final cutting blades have different characteristics suited for finish cutting. This local quality differentiation optimizes both cutting depth and edge strength for each stage.
Solution Approach 2:
The patent changes the geometric parameters of the cutting blades, specifically the distal end corner characteristics and cutting depth parameters, between initial and final cutting blade stages. This parameter optimization ensures that each stage operates with the most suitable geometric characteristics for its specific cutting function.
Data Source
AI summary
A broaching cutter includes a plurality of initial cutting blade stages for cutting formation portions to be tooth body portions in internal teeth, a plurality of intermediate cutting blade stages for cutting the formation portions to be the tooth body portions further deeply, and a plurality of final cutting blade stages for cutting formation portions to be clearance portions located deeper than the tooth body portions, the initial cutting blade stages, the intermediate cutting blade stages, and the final cutting blade stages being sequentially arranged from an upstream side in a cutting direction S. Each of a pair of distal end corners of each of cutting blades in the intermediate and final cutting blade stages has a chamfered shape larger than that of a curved shape of a pair of distal end corners of each of the cutting blades in the initial cutting blade stages.