Cutting Insert Fixing Member With Draw-In Protrusion Clamping
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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 strength, but the fixing member becomes large-sized
Solution Approach 1:
The invention divides the fixing member into two separate components: a fixing member body and a pressing member. The fixing member body provides structural strength without requiring a through hole, while the pressing member (inserted through the hole part) provides the pressing function. This segmentation allows each component to be optimized independently, reducing the overall size while maintaining strength.
Solution Approach 2:
The invention extracts the screw passage function from the fixing member body by providing a separate hole part that communicates with the external environment. The pressing member is inserted through this hole part to engage with the engagement recess, thereby providing the necessary pressing force without requiring a through hole in the fixing member body itself.
2Strength
If a large surface area is provided for screw head engagement, then sufficient strength is secured, but the fixing member size increases
Solution Approach 1:
The invention extracts the engagement function from the fixing member body by providing a separate pressing member that engages with the engagement recess. The pressing member provides the necessary engagement surface area without increasing the size of the fixing member body, as the engagement occurs within the recess rather than requiring a large external surface.
Solution Approach 2:
The pressing member is inserted into the hole part and engages with the engagement recess formed in the fitting protrusion. This nested configuration allows the pressing member to be housed within the overall structure, providing sufficient engagement surface area without increasing the external dimensions of the fixing member.
3Adaptability or versatility
If the fixing member is reduced in size, then interference with workpiece is alleviated, but the strength and engagement surface area are reduced
Solution Approach 1:
By segmenting the fixing member into a compact fixing member body and a separate pressing member, the invention reduces the overall size of the fixing member body to minimize interference with workpieces during cutting processes, while the pressing member provides the necessary fixing strength through engagement with the engagement recess.
Solution Approach 2:
The invention transitions from a two-dimensional surface engagement (screw head on external surface) to a three-dimensional engagement within the engagement recess. The pressing member engages with the recess in multiple directions, providing sufficient fixing strength in a compact configuration that reduces interference with workpieces.
Data Source
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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.