Segmented Reamer Tips for Controlled Bore Surface Roughening
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Solution Overview
Problem
Existing reamers struggle to produce a surface roughness higher than what is typically achieved, which is necessary for certain applications like pin bores on connecting rods for reciprocating piston engines, where a plain bearing element requires adequate grip.
Innovation Solution
A reamer design featuring a main body with cutting tips that have both a reamer section and a roughening section, where the roughening section is arranged at a distance from the reamer section and includes at least one roughening blade that protrudes beyond the reamer section, allowing for controlled surface roughness without the need for adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single graver is provided to roughen the surface, then the reamer can produce higher surface roughness, but the service life of the tool becomes unsatisfactory
Solution Approach 1:
The reamer is divided into multiple cutting tips, each with its own roughening section. This segmentation allows the wear to be distributed across multiple sections, extending the overall service life of the tool while maintaining the surface roughening capability.
Solution Approach 2:
The design allows individual cutting tips to be replaced or worn away while the main tool body remains functional. The multiple roughening sections ensure that even as some tips wear, the tool can continue to produce the required surface roughness.
2Manufacturing precision
If a single graver is arranged far away from the fixed reaming cutter, then the reamer can roughen the surface, but a substantial adjustment effort is necessary to precisely adjust the projection of the graver
Solution Approach 1:
The roughening section is merged with the reamer section at a small distance, eliminating the need for separate adjustment mechanisms. The fixed relative positioning simplifies the structure and removes the substantial adjustment effort required in prior art designs.
Solution Approach 2:
The reamer design is self-configuring with the roughening section automatically positioned at the correct distance from the reamer section. This eliminates the need for operator adjustment and ensures consistent surface roughness without substantial adjustment effort.
3Reliability
If multiple roughening sections are provided on multiple cutting tips, then the wear on individual roughening sections is reduced, but the device complexity increases
Solution Approach 1:
The reamer is segmented into multiple cutting tips with distributed roughening sections. This segmentation reduces wear on individual sections while the modular nature of the design prevents excessive complexity increase, as each tip is a repeating unit.
Data Source
AI summary
The invention relates to a reamer (3), having a main body (5) and at least one cutting tip (1) arranged on the main body (5), the cutting tip (1) having a reamer section (7), the cutting tip (1) having, at a distance (A) from the reamer section (7), a roughening section (9) having at least one roughening blade (11), the at least one roughening blade (11) protruding beyond the reamer section (7) by a particular projection (D).