Cutting Insert Non-Planar Surfaces Torque Reduction
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Solution Overview
Problem
Existing metal cutting tools face challenges in accurately positioning and stabilizing cutting inserts during operations, particularly in restricting outward displacement and managing forces in restricted access cutting operations, leading to instability and increased torque.
Innovation Solution
The cutting tool and insert design incorporates a block portion with resilient slots and clamping jaws, featuring a cutting portion support projecting at an angle, with non-planar surfaces for secure mating and reinforcement, providing support against vertical and longitudinal forces, and reducing torque on the shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If friction between upper and lower slot surfaces is used to restrain the cutting insert, then the structure is simple, but outward displacement of the cutting insert occurs during cutting operations
Solution Approach 1:
The patent applies non-planar (curved) profiles to the lower slot surface and bottom cutting insert surface. The lower slot surface includes a first curved surface and a second curved surface, while the bottom cutting insert surface includes corresponding first and second curved surfaces that mate together. This curvature provides mechanical interlocking to prevent outward displacement, replacing the insufficient friction-based restraint with a geometric constraint that positively engages the insert against the slot walls.
2Length of moving object
If an angled cutting insert with unsupported cutting portion is used for restricted access cutting, then the shaft can be of standard length, but forces acting on the cutting portion increase the torque of the shaft
Solution Approach 1:
The patent incorporates a support surface on the lower slot that extends forward to support the cutting portion of the insert before cutting forces are applied. This preliminary support structure is built into the slot design, allowing the cutting portion to be restrained against vertical and longitudinal forces. The support surface is positioned to provide mechanical assistance to the cutting portion, reducing the load transmitted to the shaft and thereby reducing torque requirements.
3Ease of operation
If a shortened cutting insert is used for restricted access cutting operations, then access to the cutting area is improved, but the insert has shorter clamping surfaces and is less stable
Solution Approach 1:
The patent uses non-planar curved profiles on the clamping surfaces of both the slot and the cutting insert. The lower slot surface includes curved surfaces that mate with corresponding curved surfaces on the bottom cutting insert surface. This geometric interlocking provides enhanced stability for shortened inserts by creating positive mechanical engagement that compensates for the reduced clamping surface area, preventing both outward and lateral displacement even with limited contact length.
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 design ensures accurate positioning, enhances stability by resisting outward displacement and longitudinal forces, and reduces torque on the shaft, improving the cutting tool's performance in metal cutting operations.
Implementation Method 1
an insert holder (42) for retaining the cutting insert (10), the insert holder comprising: a block portion (44) and a clamping portion (46) for retaining the cutting insert (10)
Implementation Method 2
The only element restraining the cutting insert in the slot in the outward direction is friction between the upper and lower slot surfaces and the respective top and bottom cutting insert surfaces
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A metal cutting tool having an insert holder and a cutting insert releasably secured therein. The insert holder has upper and lower blocks and upper and lower jaws, each jaw projects from the front end of each respective block. The cutting tool has a cutting portion support projecting transversely from the front end of the lower clamp at an angle a. The cutting insert has a shaft and a first cutting portion projecting transversely from the shaft at the angle a. The cutting insert has non-planar abutment surfaces formed to mate with corresponding, non-planar support surfaces located on the lower and upper jaws and on the cutting portion support.