Cutting Head Shank Segmentation for Torque Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cutting head designs face challenges in forming monobloc constructions for small diameters with multiple teeth due to complex torque transmission arrangements, which limits the number of cutting edges and requires brazing onto a steel body, making it difficult to achieve efficient torque transmission and toolholder compatibility.
Innovation Solution
A cutting head with a shank portion having varying diameters and axially extending recesses, allowing for integrally formed cutting edges and non-rotational attachment to a toolholder using axially extending pins or balls, enabling monobloc construction and simple torque transmission without radially extending pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If complex torque transmission arrangements are used, then torque transmission effectiveness is improved, but device complexity increases and manufacturing difficulty increases
Solution Approach 1:
The shank portion is segmented into multiple portions with different diameters (first portion with first diameter, second portion with second diameter smaller than first, third portion with third diameter larger than second). This segmentation allows each portion to serve specific functions: the first portion engages with the toolholder for torque transmission, the second portion provides a reduced diameter section, and the third portion extends to the end. The axially extending recesses in the first portion further segment the engagement surface, enabling effective torque transmission through pins or balls while maintaining a relatively simple overall structure.
Solution Approach 2:
Different portions of the shank have different local qualities (diameters and surface features) optimized for their specific functions. The first portion has larger diameter and axially extending recesses for torque transmission engagement, the second portion has smaller diameter for geometric constraints, and the third portion has larger diameter extending to the end. This local differentiation allows effective torque transmission without requiring complex arrangements throughout the entire shank structure.
2Ease of manufacture
If monobloc construction is used for small diameter cutting heads, then manufacturing simplicity is improved, but the number of cutting edges that can be accommodated is reduced
Solution Approach 1:
The invention transitions from relying solely on radial space (which limits the number of cutting edges on small diameter heads) to utilizing axial dimension for torque transmission. The axially extending recesses and the axial arrangement of pins or balls allow effective torque transmission without requiring complex radial arrangements. This dimensional shift enables monobloc construction with multiple cutting edges (six or more) on small diameter cutting heads (10mm or 12mm) that would otherwise be impossible.
3Strength
If radially extending pins are used for torque transmission, then torque transmission is improved, but toolholder strength and size are compromised
Solution Approach 1:
Instead of using radially extending pins that would require large toolholder bore holes and compromise toolholder strength, the invention inverts the approach by using axially extending recesses in the shank that receive pins or balls from the toolholder. This axial engagement method transmits torque effectively while requiring minimal intrusion into the toolholder structure, preserving toolholder strength and allowing smaller toolholder sizes.
Data Source
AI summary
A cutting head for a cutting tool includes a cutting portion and a shank portion. The cutting portion has a plurality of integrally formed cutting edges and the shank portion has a first end adjacent the cutting portion and a second end. The first portion of the shank portion is closer to the first end of the shank portion than the second and third portions of the shank portion and the third portion of the shank portion is disposed closer to the second end of the shank portion than the first and second portions. The first portion of the shank portion has an exterior surface including at least one axially extending recess extending from an end of the first portion closest to the second portion toward the first end of the shank portion. The cutting head is formed of a pressed and sintered cemented carbide material.