Angled Clamping Finger for Secure Cutting Insert Retention
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Solution Overview
Problem
Existing chip-removing cutting tools face issues with secure clamping of the cutting plate due to lack of radial compressive force, leading to detachment of the cutting tip during use.
Innovation Solution
The design enhances clamping force by incorporating an angled bearing surface on the clamping finger, allowing the clamping head to apply compressive force optimally and a clamping surface on the nose of the clamping finger to engage with the cutting plate, along with a compression spring for easy removal, ensuring secure attachment and orientation of the cutting insert.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the clamping screw is constrained by a bolt in a slot with double guidance, then the clamping finger can be positioned, but the radial compressive force on the cutting insert is insufficient and secure clamping cannot be achieved
Solution Approach 1:
The clamping screw head is given a specific geometric shape with an angled bearing surface (at angle α) that changes the force transmission parameters. This angled surface redirects the clamping force to create both radial compressive force and axial tensile force components, optimizing the force distribution for secure clamping.
Solution Approach 2:
The clamping mechanism transitions from simple linear constraint to multi-dimensional force application. The clamping screw head contacts the clamping finger at an angled bearing surface, creating force components in multiple directions (radial and axial) rather than single-direction compression, enabling secure clamping through multi-axis force application.
2Force
If the clamping finger pulls the cutting insert into the recess, then positioning is achieved, but there is essentially no radial compressive force on the cutting insert
Solution Approach 1:
The clamping screw head geometry is specifically designed with an angled bearing surface that changes the force transmission parameters. This creates a force vector decomposition where part of the clamping force becomes radial compressive force on the cutting insert, while the other part becomes axial tensile force, simultaneously achieving both compression and retention.
Solution Approach 2:
The clamping screw head has an asymmetric angled bearing surface rather than a symmetric flat surface. This asymmetric geometry directs the force application in a specific orientation, creating the necessary radial component for compressive force while maintaining the pulling action for insert retention.
3Force
If the clamping head presses with its entire surface on the bearing surface, then contact area is maximized, but the compressive force on the cutting plate is not optimized
Solution Approach 1:
Instead of uniform pressure distribution over the entire clamping head surface, the design creates localized high-compression zones through the angled bearing surface geometry. The force is concentrated at specific contact points where the angled surface directs the load, optimizing compressive force transmission to the cutting plate at critical locations rather than distributing it uniformly.
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 configuration improves the clamping force on the cutting plate, preventing detachment and allowing for precise orientation and easy removal of the cutting insert, ensuring optimal utilization and preventing wastage of cutting edges.
Implementation Method 1
a compression spring is preferably arranged between the clamping finger and the carrier tool
Data Source
Figure 1~7
Figure 8~13
Figure 14~17
AI summary
The invention relates to a cutting tool consisting of a carrier tool (24) which has a recess (8) for receiving a cutting insert (5, 9, 30) with a clamping depression (22) on the rake face (10), the cutting insert (5, 9, 30) being held in the carrier tool (24) by a clamping finger (1) having a lug (21), the clamping finger (1) being secured to the carrier tool (24) via a clamping bolt (2) in such a manner that, when the clamping bolt (2) is tightened, the clamping finger (1) pulls the cutting insert (5, 9, 30) into the recess (8), and a falciform engagement element (12) for engaging into the clamping depression (22) in the cutting insert (5, 9, 30) being arranged on the lug (21), and a) the clamping bolt (2) having a clamping head (2b) which overhangs with respect to its shank (2a), the clamping head (2b) being seated on a locating surface (6) of the clamping finger (1) which is angled off with respect to the axis (16) of the clamping bolt (2), and the angled-off locating surface (6) being arranged in such a manner that the compressive force of the clamping finger (1) on the cutting insert (5, 9, 30) is reinforced, and b) the lug (21) of the clamping finger (1) having a clamping surface (11) for bearing against the rake face (10) of the cutting insert (5, 9, 30).