Cutting Tool Head Member Inclined Clamp Screw Design
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Solution Overview
Problem
Cutting tools with detachable inserts face challenges in achieving stable clamping of cutting inserts due to limited jaw width, leading to insufficient clamping force and potential instability during machining, especially when using large-diameter clamp screws.
Innovation Solution
The head member design includes a clamp screw that inclines as it screws into the holder, utilizing a connecting portion that widens in the direction of screwing to allow elastic deformation of one jaw portion, ensuring a straight pressing surface and stable clamping force, even with large-diameter screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a large-diameter clamp screw is used to increase clamping force, then the clamping force is improved, but the jaw width becomes insufficient to accommodate the screw, making it difficult to secure the space for screwing
Solution Approach 1:
The clamp screw is designed to screw in at an inclination angle rather than perpendicular to the jaw surface. This dimensional change in the screwing direction allows the screw to bypass the limited jaw width constraint while still engaging both jaw portions effectively, enabling the use of larger diameter screws without increasing the required jaw width
Solution Approach 2:
The clamp screw features an asymmetric threading configuration where the screwing direction is inclined relative to the jaw surface normal. This asymmetric design allows the screw to accommodate large diameter while fitting within the limited jaw width by utilizing the inclined path through the jaw portions
2Force
If the clamp screw is screwed in at an inclination to accommodate large diameter, then the clamp screw size is improved, but the jaw portion elastically deforms and bends in the screwing direction, causing instability in clamping
Solution Approach 1:
The pressing surface is designed with a specific inclination angle that matches the clamp screw's screwing direction. This local quality adjustment ensures that the elastic deformation of the jaw portion occurs uniformly along the screwing path, preventing bending and maintaining clamping stability despite the inclined screwing action
Solution Approach 2:
The pressing surface inclination angle is optimized to correspond with the clamp screw's inclination angle. By changing this geometric parameter, the design allows the jaw portion to deform elastically in a controlled manner during screwing, preventing unwanted bending while maintaining stable clamping of the cutting insert
3Device complexity
If the clamp screw is screwed in perpendicular to the jaw surface, then the clamping action is simple, but the clamp screw diameter must be small due to limited jaw width, reducing clamping force
Solution Approach 1:
Instead of screwing perpendicular to the jaw surface, the clamp screw is designed to screw in at an inclination angle. This dimensional change in the screwing direction allows the screw to accommodate large diameter while fitting within the limited jaw width, thereby increasing clamping force without significantly increasing device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables a stable and firm clamping of cutting inserts, improving machining accuracy by preventing inclination and clattering, and allowing the use of larger clamp screws without compromising stability.
Implementation Method 1
one jaw portion is enabled to elastically deform towards the other jaw portion by using as a fulcrum a connecting portion
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
In a head member (30) for this cutting tool with detachable insert (70), a slit (38) is provided so as to further extend towards a rear end side from a rear end for an insert attachment seat formed by a pressing surface of an upper jaw portion of a head member body (31) and a pedestal surface of a lower jaw portion (33). Also, a clamp screw engaged with the upper jaw portion is screwed while inclining in a direction separated as it moves towards the lower jaw portion (33), with respect to an imaginary plane (P) which extends along an extension direction of the slit (38) and in a direction in which the pressing surface and the pedestal surface face each other, whereby the upper jaw portion is enabled to elastically deform by using as a fulcrum a connecting portion 39 between a rear wall surface (38B) of the slit (38), and a rear end surface (31F) of the head member body (31). Moreover, the connecting portion (39) is formed such that the width thereof in the extension direction becomes gradually greater as the clamp screw moves in a separating direction from the imaginary plane (P). According to the head member (30), a cutting insert (50) can be stably clamped by elastically deforming the jaw portion formed with the pressing surface straight with respect to the pedestal surface while operating a large clamping force.