Toolholder Pocket Geometry for Mixed Clearance Angle Inserts
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Solution Overview
Problem
Existing rotary cutting tools require separate toolholders for positive and negative style cutting inserts, increasing costs due to the need for dual toolholder types.
Innovation Solution
The toolholder design incorporates seating pads with angled surfaces to accommodate both positive and negative style cutting inserts, allowing for a single toolholder to support both types by adjusting the angles of the support pads to match different clearance angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a toolholder is designed for positive style cutting inserts with high clearance angles, then it accommodates inserts for certain materials like high temperature alloys, but it cannot accommodate negative style cutting inserts with smaller clearance angles without causing spring back
Solution Approach 1:
The toolholder is designed with a universal pocket structure that can accommodate both positive style cutting inserts with high clearance angles and negative style cutting inserts with smaller clearance angles. The pocket includes a bottom floor and side walls configured to provide stable support for different insert geometries, eliminating the need for separate toolholders for different insert styles.
Solution Approach 2:
The pocket structure incorporates localized features with different geometric properties: the bottom floor has a first configuration optimized for positive style inserts, while the side walls include second configurations specifically designed to support negative style inserts. This local differentiation within the unified pocket structure enables compatibility with both insert types while maintaining mounting stability.
2Reliability
If separate toolholders are used for positive and negative style cutting inserts, then each insert type has optimal mounting stability, but the cost increases due to requiring two different types of toolholders
Solution Approach 1:
The invention consolidates the need for multiple toolholder types into a single universal toolholder design. The pocket structure integrates features that provide optimal mounting stability for both positive style inserts (with high clearance angles) and negative style inserts (with smaller clearance angles), reducing the total number of toolholder variants required in the system.
Solution Approach 2:
The design merges the previously separate toolholder configurations into a single integrated pocket structure. The bottom floor and side walls are configured to simultaneously provide the structural support needed for different insert styles, combining the functions of what were previously separate toolholders into one unified component.
Data Source
AI summary
A toolholder (10) has a pocket (20) that accommodates two styles of cutting inserts (25, 25′) having different clearance angles (CA). A support pad (78, 80) protrudes from two side walls (82, 84) of the pocket (20). Each support pad (78, 80) includes a first, planar wall (78a, 80a) and a second, planar wall (78b, 80b) formed at a composite angle defined by a first angle (92) and a second angle (94). The first, planar wall (78a, 80a) enables the pocket (20) to accommodate the second style of cutting insert (25′), and the second, planar wall (78b, 80b) enables the pocket (20) to accommodate the first style of cutting insert (25). In one aspect, the support pads (78, 80) extend the entire length, L, of the support pad (78, 80). In another aspect, an indentation (112, 114) divides one or both of the support pads (178, 180) into two portions, each portion having two planar walls (178a, 178b, 178c, 178d, 180a, 180b, 180c, 180d).