Insert Pocket Abutment Geometry for Stable Rotary Milling
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Solution Overview
Problem
Existing rotary cutting tools lack stability during high-speed milling operations and ramp down milling, particularly due to inadequate abutment mechanisms that lead to relative movement between cutting inserts and their seats, affecting the precision and effectiveness of the cutting process.
Innovation Solution
A rotary cutting body with insert receiving pockets featuring a threaded bore, radially outward facing pocket walls, and a plurality of male and/or female abutment elements forming an external acute clamping angle, which securely engages the cutting insert with a clamping screw, ensuring high stability and reduced rotational displacement during milling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional abutment mechanisms are used in rotary cutting tools, then the device complexity is reduced, but the stability of the cutting insert during high-speed milling operations deteriorates
Solution Approach 1:
The abutment mechanism is segmented into multiple independent abutment elements (first abutment element, second abutment element, third abutment element) that can be individually configured. Each element provides specific directional support, allowing the system to achieve enhanced stability through distributed constraint points rather than a single complex abutment structure.
Solution Approach 2:
The invention transitions from conventional single-plane abutment to multi-dimensional constraint by positioning abutment elements on different surfaces (seat surface, radial wall, axial wall) of the insert receiving pocket. This spatial distribution across multiple dimensions creates comprehensive constraint that prevents relative movement in all directions during high-speed milling.
2Manufacturing precision
If multiple abutment elements are added to the insert receiving pocket, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The precision requirement is segmented across multiple abutment elements rather than demanding high precision from a single complex feature. Each abutment element (first, second, third) provides localized constraint that collectively ensures accurate positioning of the cutting insert, distributing the precision requirement across simpler individual components.
Solution Approach 2:
Each abutment element is designed with specific local geometry optimized for its particular function: the first abutment element on the seat surface, the second on the radial wall, and the third on the axial wall. This local optimization allows each element to contribute precisely to insert positioning while maintaining simple individual structures that are easier to manufacture.
3Reliability
If conventional abutment structures are used, then the ease of manufacture is improved, but the reliability of the cutting tool during ramp down milling deteriorates
Solution Approach 1:
The reliable constraint system is segmented into three independent abutment elements rather than requiring a single complex integrated feature. This segmentation allows each element to be manufactured using standard machining operations on simple geometries, while their combined effect provides the multi-directional constraint necessary for reliable performance during ramp down milling operations.
Solution Approach 2:
The invention adds reliability by distributing constraint features across multiple dimensions and surfaces of the insert receiving pocket. Instead of relying on a single complex abutment structure, the first, second, and third abutment elements are positioned on different surfaces (seat surface, radial wall, axial wall), creating redundant constraint paths that enhance reliability without requiring advanced manufacturing capabilities.
4Productivity
If simple abutment mechanisms are used, then the device complexity is reduced, but the productivity during high-speed milling operations deteriorates
Solution Approach 1:
The abutment system is segmented into multiple specialized elements that collectively provide superior constraint during high-speed milling. This segmentation enables the insert to remain firmly positioned under dynamic loading conditions, preventing relative movement that would compromise cutting effectiveness, while each individual element remains structurally simple.
Solution Approach 2:
By distributing abutment elements across multiple dimensions and surfaces of the insert receiving pocket, the system achieves comprehensive constraint that maintains insert stability during the dynamic conditions of high-speed milling. This multi-dimensional arrangement ensures the cutting tool maintains precision and effectiveness throughout the operation without requiring overly complex individual components.
Data Source
AI summary
A cutting body rotatable about a tool axis has an insert receiving pocket with a seat surface at an axial forward end thereof. The seat surface has a plurality of abutment elements, including an axial abutment element having an axially forward facing abutment surface and at least one radial abutment element. In a top view of the insert receiving pocket, the axially forward facing abutment surface forms an external acute clamping angle with a radially outward facing pocket wall. A rotary cutting tool includes the cutting body, and a cutting insert removably secured in the insert receiving pocket, having a base surface in contact with the seat surface. The at least one radial abutment element occupies or is occupied by at least one radial abutting element of the base surface, and the axially forward facing abutment surface is in contact with an axial abutting surface of the base surface.