Cutting Insert Fixing Member With Nested Screw Engagement
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Solution Overview
Problem
Existing cutting tools require a large-sized fixing member with a through hole for a screw and a sufficient surface area for screw head engagement, which limits size reduction while maintaining strength and interferes with workpieces during cutting processes.
Innovation Solution
A fixing member configuration that includes a fitting protrusion fitted into a fitting hole of the tool body, with an engagement recess on the protrusion engaged by a pressing member, allowing the protrusion to be drawn into the hole, thereby pressing and fixing the cutting insert without the need for a through hole or large surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a through hole is formed in the fixing member for screw passage, then the fixing member can secure sufficient thickness around the through hole to maintain strength, but the fixing member becomes large-sized
Solution Approach 1:
The pressing member is inserted into the fitting protrusion, and the engagement recess is formed within the peripheral surface of the fitting protrusion. This nesting arrangement allows the pressing mechanism to be contained within the fixing member body, eliminating the need for a through hole and large engagement surface, thereby reducing the overall size while maintaining structural strength.
Solution Approach 2:
The engagement recess is formed on the peripheral surface of the fitting protrusion, utilizing the circumferential dimension rather than requiring a large planar surface. This dimensional approach allows the screw head to engage with the pressing member within a compact volume, resolving the contradiction between strength requirements and size reduction.
2Strength
If a large surface area is provided for screw head engagement, then sufficient engagement strength is achieved, but the fixing member size increases causing interference with workpieces
Solution Approach 1:
The engagement recess is nested within the fitting protrusion, allowing the screw head to engage in a compact space. This eliminates the need for a large external engagement surface, thereby preventing interference with workpieces during cutting operations while maintaining sufficient engagement strength through the nested engagement mechanism.
3Volume of moving object
If the fixing member is reduced in size, then interference with workpieces is reduced and chip discharge space is increased, but the strength and engagement capability may be compromised
Solution Approach 1:
The pressing member is nested within the fitting protrusion, and the engagement recess is formed on the peripheral surface of the fitting protrusion. This nested configuration achieves compact size while maintaining strength through the engagement mechanism that utilizes the circumferential surface of the fitting protrusion, ensuring sufficient fixing capability without compromising structural integrity.
Solution Approach 2:
The engagement recess utilizes the circumferential dimension of the fitting protrusion rather than requiring a large planar surface. This dimensional approach maintains engagement strength in a compact volume, resolving the contradiction between size reduction and strength maintenance.
Data Source
AI summary
The present invention provides a fixing member that presses and fixes a cutting insert disposed on an insert mounting part of a tool body, the fixing member including: a fixing member body that has a pressing part for pressing the cutting insert; a fitting protrusion that is provided so as to protrude from a bottom part of the fixing member body, the fitting protrusion being fitted in a fitting hole formed in the tool body; and an engagement recess formed in a peripheral surface of the fitting protrusion, the engagement recess being engaged with a leading end of a fastening screw which is screwed into an internal thread that communicates with the fitting hole of the tool body, wherein the fitting protrusion is drawn into the fitting hole by the fastening screw that engages with the engagement recess, whereby the pressing part presses and fixes the cutting insert.