Cutting Tool Assembly Dovetail Coupler Positioning
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Solution Overview
Problem
Existing cutting tool assemblies face challenges in accurately orienting and securely fastening tool heads, leading to inefficient force distribution and potential separation during metal cutting operations, particularly in internal grooving and boring processes.
Innovation Solution
A cutting tool assembly design featuring a tool holder with a male or female type coupler and abutment wall surfaces inclined at an acute angle, combined with a tool head having a corresponding through bore and abutting wall surfaces, ensures secure engagement and efficient force transmission through a fastening screw, allowing for precise and repeatable positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dovetail groove with side surfaces inclined at an acute angle is used to automatically orient the tool head, then the tool head positioning accuracy is improved, but the difficulty of initially locating the slide member within the groove increases
Solution Approach 1:
The patent incorporates a locating pin that protrudes from the tool head and fits into a corresponding recess in the tool holder before the dovetail engagement. This preliminary locating action guides the slide member into the correct position within the dovetail groove, eliminating the difficulty of initial location while maintaining the positioning accuracy benefits of the dovetail configuration.
2Ease of manufacture
If the tool holder seat surface is horizontal, then the manufacturing simplicity is improved, but the cutting force distribution becomes unfavorable causing forces to be directed away from the seat surface
Solution Approach 1:
The patent changes the orientation parameter of the tool holder seat surface from horizontal to inclined at a specific angle (e.g., 45 degrees). This parameter change optimizes the cutting force distribution by directing forces toward the seat surface, improving clamping effectiveness. The patent compensates for the increased manufacturing complexity by providing precise angular specifications and maintaining symmetry in the design.
Solution Approach 2:
The patent employs asymmetric positioning of the cutting insert relative to the tool holder, with the insert angled to work against the inclined seat surface. This asymmetric configuration ensures that cutting forces are directed toward the seat surface, maximizing the mechanical advantage of the inclined design.
3Device complexity
If a single large solid carbide cutting insert is used, then the structural simplicity is improved, but the cost increases due to the expense of solid carbide tooling
Solution Approach 1:
The patent segments the cutting tool into two distinct parts: an inexpensive tool holder body and a replaceable cutting insert. This segmentation allows the use of cheaper materials for the tool holder while concentrating the expensive solid carbide material only in the cutting insert, thereby reducing overall cost. The modular design also enables replacement of only the insert when worn, rather than the entire tool.
Solution Approach 2:
The patent designs the tool holder with a universal seat surface and mounting mechanism that can accommodate different types of cutting inserts. This multi-functionality allows the same tool holder to be used with various inserts for different cutting operations, maximizing the value of the investment and reducing the need for multiple specialized tools.
4Productivity
If the tool head is designed for easy removal and reattachment, then the productivity is improved through quick tool changes, but the reliability of secure fastening during cutting operations decreases
Solution Approach 1:
The patent incorporates a locating pin and recess system that performs preliminary positioning of the tool head on the tool holder before final fastening. This preliminary action ensures accurate alignment and proper engagement of the fastening mechanism, maintaining reliability while enabling quick tool changes. The locating features prevent misalignment that could compromise fastening security.
Solution Approach 2:
The dovetail groove and slide member configuration creates a self-aligning and self-latching mechanism. When the tool head is inserted, the dovetail surfaces automatically guide and secure the tool head in the correct position, providing inherent reliability without requiring complex fastening procedures. This self-service mechanism maintains secure fastening while enabling rapid tool changes.
Data Source
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AI summary
A cutting tool assembly for boring and internal grooving operations includes a tool head having a removably secured cutting insert at a forward insert receiving end and a rear mating end with a male or female type tool holder coupler in the form of an engagement protrusion or cutting holder receiving pocket. The tool head is fixed to a tool holder with a front mating end having a female or male tool head coupler in the form of a tool head receiving pocket or engagement protrusion. Following assembly, at least three abutting wall surfaces and an adjacent support surface of the tool holder coupler make contact with at least three non-coplanar abutment surfaces and an adjacent supporting surface of the tool head coupler, respectively, and a fastening screw member extends through a through bore in the tool holder coupler engaging a threaded screw bore in the tool head coupler.