Friction-Ring Shank Structure to Limit Cutting Tool Rotation
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Solution Overview
Problem
Rotatable cutting tools experience excessive wear and mechanical failure due to the harsh environments in which they operate, particularly in PCD applications with heavy cutting portions, leading to reduced tool life.
Innovation Solution
Incorporating a friction ring made of resilient material within a retaining groove of the shank, secured by a retainer ring, which provides increased strength and frictional resistance to rotational movement, thereby reducing wear and extending tool life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a heavier cutting portion is used in PCD applications, then cutting performance is improved, but wear and loading on the shank increases leading to reduced tool life
Solution Approach 1:
The shank diameter is increased from conventional sizes (e.g., 19mm) to larger sizes (e.g., 22mm, 25mm, or 28mm) to change the mechanical parameters of the shank. This parameter change increases the shank's strength and load-bearing capacity, allowing it to support heavier cutting portions while reducing wear and mechanical failure, thereby resolving the contradiction between cutting performance and tool life
Solution Approach 2:
A friction ring made of resilient material (such as polyurethane, rubber, or elastomer) is introduced as a composite component within the shank structure. This friction ring creates frictional resistance to rotational movement, reducing wear on the shank and holder interface. The combination of the increased shank diameter and the friction ring creates a composite solution that simultaneously supports heavier cutting portions and extends tool life
2Strength
If the shank diameter is increased to support heavier cutting portions, then strength is improved, but device complexity increases
Solution Approach 1:
The shank structure is segmented into distinct functional components: the main shank body (increased diameter for strength), the retaining groove, and the friction ring. This segmentation allows each component to be optimized independently - the shank diameter is increased for strength while the friction ring is added as a separate element to provide frictional resistance, rather than attempting to achieve both functions with a single complex shank design
Solution Approach 2:
The friction ring acts as an intermediary component between the shank and the holder. Instead of increasing shank complexity to directly achieve both strength and wear resistance, the friction ring mediates the interaction by providing frictional resistance, allowing the shank to maintain a relatively simple increased-diameter design while still supporting heavier cutting portions and extending tool life
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
The friction ring configuration enhances the durability of cutting tools by imparting frictional resistance, potentially increasing tool life by 25-50% and preventing free-spinning, while supporting heavier cutting heads with increased shank strength.
Implementation Method 1
The friction ring can be configured such that additional portions of the friction ring reposition to be at an outer periphery of the friction ring as the retainer ring is disposed to increase compression of the friction ring
Implementation Method 2
The friction ring may be formed from a resilient and non-rigid material
Data Source
AI summary
Cutting tools (14) and cutting tool assemblies (10) include a friction ring (79). The friction ring (79) is provided in (disposed/secured within) a retaining groove (32) of a shank (30) of the cutting tool (14). The friction ring (79) can be formed from a resilient material or materials (150). The friction ring (79) can be secured in the retaining groove (32) by a retainer ring (80). The cutting tools (14) can also include a shank (30) having an increased diameter to provide increased strength and allow for a heavier cutting portion (28) of the cutting tool (14). The cutting tools (14) and cutting tool assemblies (10) can also include a washer (100) fitted about the shank (30) and positioned adjacent to a back side (26) of the cutting portion (28) of the cutting tool (14) for stabilizing the cutting tool body (22) in relation to a cutting tool holder (12).