Cutting Tool Insert Mounting Device With Inclined Screw Hole
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Solution Overview
Problem
Existing cutting tool mounting devices face challenges in stabilizing the tightened state of cutting inserts, particularly when dealing with difficult-to-cut materials and high-speed cutting, leading to a shorter lifespan of tightening screws due to uneven force distribution.
Innovation Solution
A mounting device design where the central axis of the screw hole is inclined relative to the normal direction of the insert mounting seat, with a distinct axis shift and inclination direction, ensuring the cutting insert is pressed onto specific side wall surfaces, providing enhanced stability and distribution of tightening force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the central axis of the screw hole is shifted in parallel with respect to the central axis of the through hole, then the cutting insert can be pressed onto the side wall surface, but the tightening screw is subjected to fracture force and its lifespan becomes short
Solution Approach 1:
The patent changes the geometric parameters of the screw hole by inclining its central axis relative to the normal direction of the bottom wall surface. This parameter change allows the screw hole central axis to be both shifted laterally and inclined, creating a combined effect that presses the cutting insert against the side wall surface while directing tightening forces along a more favorable path that reduces fracture risk to the tightening screw.
2Duration of action of stationary object
If the central axis of the screw hole is inclined with respect to the normal direction of the bottom wall surface, then fracture of the tightening screw is suppressed, but the tightening stability needs further improvement for difficult-to-cut materials and high-speed cutting
Solution Approach 1:
The patent introduces asymmetry in the mounting structure by inclining the screw hole central axis at a specific angle relative to the normal direction of the bottom wall surface. This asymmetric configuration, combined with the lateral shift, creates a directional pressing force that enhances tightening stability while maintaining screw durability. The asymmetric geometry ensures the cutting insert is firmly pressed against the side wall surface in a controlled manner.
3Reliability
If the central axis of the screw hole is shifted in parallel with respect to the central axis of the through hole, then the cutting insert can be pressed onto the side wall surface, but uneven force distribution causes premature screw fracture
Solution Approach 1:
The patent transitions from a two-dimensional lateral shift to a three-dimensional configuration by adding an inclination component to the screw hole central axis. This dimensional change creates a combined lateral shift and angular inclination that distributes tightening forces more uniformly. The inclination angle introduces a vertical force component that complements the lateral pressing effect, resulting in more balanced force distribution across the cutting insert and reduced stress concentration on the tightening screw.
Data Source
AI summary
A cutting insert mounting system adapted for a cutting tool in which, by using a tightening screw, a cutting insert is detachably mounted on an insert mounting seat. A central axis of a screw hole of the insert mounting seat is inclined with respect to a normal direction of a bottom wall surface of the insert mounting seat. When the cutting insert is placed on the insert mounting seat, on a virtual plane defined to expand the bottom wall surface, a central axis of the screw hole is shifted from the central axis of a through hole of the cutting insert to the side of one of two side wall surfaces of the insert mounting seat. On the virtual plane, an axis shift direction of the central axis of the screw hole and an inclination direction of the central axis of the screw hole are different.