Cutting Insert Torque Transmission via Segmented Contact Surfaces
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Solution Overview
Problem
Existing circular milling cutters face challenges in transmitting high torques without compromising stability due to the interface between the cutting insert and tool holder, which requires precise and stable contact surfaces for effective torque transmission.
Innovation Solution
The design incorporates a cutting insert with a base body, cutting bodies, a cutting insert bore, radial, axial, and torque transfer surfaces, along with a spigot, which provides a cylindrical or conical radial contact surface and segmented axial contact surfaces for stable bearing contact with the tool holder, allowing for efficient torque transmission while maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional cutting insert interface is used, then the structure is simple, but the torque transmission capability is insufficient
Solution Approach 1:
The cutting insert interface is segmented into multiple functional surfaces: radial contact surfaces for axial load bearing, axial contact surfaces for radial load bearing, and torque transfer surfaces for torque transmission. This segmentation allows each surface to be optimized for its specific function, enabling high torque transmission while maintaining structural clarity
Solution Approach 2:
The invention transitions from a conventional single-plane contact interface to a multi-dimensional contact system with surfaces oriented in different directions (radial, axial, and toroidal). This dimensional expansion allows simultaneous bearing of forces in multiple directions and effective torque transmission
2Manufacturing precision
If the cutting insert bears against the tool holder with simple contact, then the manufacturing is easier, but the alignment precision is insufficient
Solution Approach 1:
Different regions of the cutting insert interface are given different geometric qualities: radial contact surfaces with cylindrical/conical geometry for precise axial alignment, axial contact surfaces for radial positioning, and torque transfer surfaces with specific flank angles for torque transmission. This localized optimization of surface properties achieves high alignment precision
3Reliability
If a stable insert seat is designed for high torque, then the torque transmission is improved, but the contact surface requirements become more stringent
Solution Approach 1:
The contact interface is divided into segmented zones with distinct functions: radial contact surfaces for axial stability, axial contact surfaces for radial stability, and torque transfer surfaces for rotational stability. This segmentation distributes the precision requirements across multiple surfaces rather than concentrating them on a single interface
Solution Approach 2:
The radial contact surfaces are designed as cylindrical or conical curved surfaces rather than flat surfaces. This curvature provides self-aligning characteristics and more forgiving tolerance zones, reducing the stringency of manufacturing precision requirements while maintaining stability
Data Source
AI summary
A cutting insert, an associated tool holder, and a tool comprising such a cutting insert and such a tool holder. The cutting insert has a base body, which defines a cutting insert longitudinal axis, at least one cutting body, which laterally projects from a periphery of the base body and comprises a cutting edge, and a cutting insert bore, which is provided in the base body and extends along the cutting insert longitudinal axis, wherein on an underside, running transversely to the cutting insert longitudinal axis, of the base body are provided a plurality of elevations, which are arranged distributed in the peripheral direction and protrude from the underside of the base body, so that, between respectively two adjacent elevations, a relative depression is respectively obtained, wherein the cutting insert comprises at least one radial contact surface, a plurality of axial contact surfaces and a plurality of torque transfer surfaces for a bearing contact of the cutting insert against the tool holder.