Milling Tool Body Assembly With Locking Disc for Low Run-Out
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Solution Overview
Problem
Existing milling tool bodies suffer from vibrations and axial/radial run-out due to manufacturing tolerances and centralized coupling forces, leading to reduced machining precision and increased wear on cutting inserts.
Innovation Solution
A milling tool body design with a constant diameter central through-hole and a locking disc that distributes compressive forces radially, eliminating the need for internal shoulders and allowing for single-sided manufacturing, thereby reducing vibrations and run-out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate drilling and milling operations are performed from both front and rear end surfaces to create parts of different diameters, then the milling tool body can be mounted to the adaptor, but manufacturing tolerances lead to non-concentric parts causing vibrations during rotation
Solution Approach 1:
The patent divides the mounting function into two separate components: a through-hole of constant diameter for rotational alignment and a locking disc for securing the tool body to the adaptor. This segmentation eliminates the need for complex multi-step drilling and milling operations that compromise concentricity, while maintaining ease of manufacture through simpler single-sided operations.
2Strength
If a screw head presses directly on an internal shoulder surface, then the milling tool body can be fastened to the adaptor, but the centrally applied coupling force induces elastic deformation and bending causing axial and radial run-out
Solution Approach 1:
The patent extracts the force application function from the central through-hole region and relocates it to the locking disc positioned at the periphery of the milling tool body. This extraction prevents the screw from directly pressing on internal shoulder surfaces, eliminating the source of elastic deformation and bending that cause run-out, while maintaining adequate fastening strength through the locking disc mechanism.
Solution Approach 2:
The patent transitions from centralized force application in the axial dimension to distributed peripheral force application in the radial dimension through the locking disc. This dimensional change moves the coupling force from the center to the periphery, preventing elastic deformation and bending of the tool body that would otherwise occur with central loading.
3Reliability
If internal shoulders and coolant chambers are manufactured with complex multi-sided operations, then mounting and cooling functions are achieved, but manufacturing complexity and time increase
Solution Approach 1:
The patent extracts the coolant chamber function from the complex multi-sided drilling and milling operations and replaces it with a through-hole of constant diameter that can be manufactured in a single operation from one side. The locking disc is similarly extracted as a separate component that simplifies the mounting function, eliminating the need for complex internal shoulder formation and significantly reducing manufacturing cycle time while maintaining reliability.
Data Source
Figure 1a~1c
Figure 2~3
Figure 4
AI summary
The invention relates to a milling tool body (1) being rotatable around a central rotation axis (R). The milling tool body (1) has a front end surface (2) and a rear end surface (3), wherein an envelope surface (4) surrounds the central rotation axis (R) and extends between the rear end surface (3) and the front end surface (2). A plurality of insert pockets (5) are formed in a transition between the envelope surface (4) and the front end surface (2). A first central through-hole (6) of constant diameter extends between the rear end surface (3) and the front surface (2). The milling tool body (1) includes a locking disc (7) with a second central through-hole (8) and a fastening device (9) arranged to extend through the second central through-hole (8) of the locking disc (7). The locking disc (7) is arranged to press against the front end surface (2) of the milling tool body (1) when mounting the milling tool body (1) to an adaptor (10) by the fastening device (9) being mountable to an end (11) of the adaptor (10) insertable into the first central through-hole (6) of the milling tool body (1).