Cutting Insert Clamp Mechanism for Dense Tool Body Layouts
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Solution Overview
Problem
Existing cutting tools face challenges in maximizing the number of cutting inserts on a tool body of a given diameter due to space constraints, particularly with traditional fastening mechanisms that require significant space and high manufacturing tolerances.
Innovation Solution
A cutting tool design featuring a clamp and clamping screw mechanism with a screw shaft and clamp pocket configuration that allows for efficient clamping of cutting inserts using a single-threaded screw, reducing space requirements and manufacturing complexity, while enabling easy access and minimal loads on the tool components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional screw fastening mechanism is used to secure cutting inserts, then the cutting insert can be reliably fixed, but the space required in the tool body between insert seats increases
Solution Approach 1:
The clamp mechanism transitions the fastening action from a traditional axial screw insertion (one-dimensional) to a multi-dimensional clamping action where the clamp lever rotates about a pivot point, applying force in multiple directions. This allows the fastening function to be achieved in a more compact space by utilizing rotational motion and lever mechanics rather than linear screw insertion.
Solution Approach 2:
The clamp is designed as a dynamic component that rotates about a pivot point during the fastening process. The clamp transitions from an open position (allowing insert installation) to a closed clamping position (securing the insert). This dynamic movement enables the mechanism to achieve reliable securing in a smaller overall space compared to static traditional screw mechanisms.
2Ease of manufacture
If sufficient material thickness is provided behind the tangential support surface for a threaded hole, then the screw can be engaged, but the space required in the tool body increases
Solution Approach 1:
The threaded hole engagement requirement is extracted from the main tool body structure and relocated to the clamp assembly itself. The clamp contains its own threaded hole for screw engagement, separated from the insert seat structure. This extraction allows the tool body to have reduced material thickness requirements while maintaining manufacturability of the fastening mechanism.
Solution Approach 2:
The fastening system is segmented into separate functional components: the insert seat provides positioning, the clamp provides clamping force, and the screw provides actuation. Each component has its own threaded hole engagement feature. This segmentation distributes the manufacturing requirements across multiple small components rather than requiring large threaded holes in the tool body, reducing overall space requirements.
3Ease of operation
If free space is left in front of the cutting insert for screw insertion and torque tool engagement, then the screw can be installed, but the space between insert seats increases
Solution Approach 1:
The screw insertion and torque application functions are nested within the clamp assembly structure. The clamp body incorporates recesses and features that guide screw insertion and provide torque tool engagement surfaces directly at the clamp location, eliminating the need for separate free space in front of the insert. The fastening operations are nested into the compact clamp mechanism rather than requiring external space.
4Productivity
If more cutting inserts are mounted on a tool body of given diameter, then the productivity increases, but the space constraints between insert seats worsen
Solution Approach 1:
The clamp mechanism utilizes rotational motion about a pivot point and lever-arm geometry to achieve clamping force generation in a compact space. This multi-dimensional mechanical advantage allows the fastening function to be performed in a smaller footprint, enabling closer spacing of insert seats around the tool body circumference, thereby increasing the number of inserts that can be mounted.
Solution Approach 2:
The dynamic clamp mechanism with rotating movement requires less static space than traditional fixed screw mechanisms. The clamp can transition between open and closed states within a compact envelope, allowing insert seats to be positioned closer together while still accommodating the fastening operation. This dynamic behavior enables higher insert density on the tool body.
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
A cutting tool comprising: - a tool body (2) with an insert seat (10) and an associated clamp pocket (20); - a cutting insert (30) releasably mountable in the insert seat; - a clamp (40) received in the clamp pocket; and - a screw (60) that extends with play through a through hole (47) in the clamp and is engaged in a hole (22) at the bottom of the clamp pocket. Upon tightening of the screw, the clamp will slide against an inclined guide surface (26) in the slide pocket via a slide surface (46) on the clamp, which will force the clamp to move transversally to the screw shaft (61) towards the cutting insert such that a clamp protrusion (45) on the clamp is moved into a recess (37) in the cutting insert and clamping surfaces on the clamp are pressed tightly against corresponding contact surfaces on the cutting insert.