Machining Tool Coupling Region Separates Clamping and Centering
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Solution Overview
Problem
Existing machining tools with cutting heads face challenges in securely and easily fitting into holders without clamping aids and remachining, particularly due to the self-tightening forces caused by conical threads, which increase machining forces and wear on threads.
Innovation Solution
The coupling region of the cutting head is designed with a flat contact area, a cylindrical thread carrier with an external thread, and a clamping cone, which separates force introduction from centering and guiding, using a holder with a planar counter-contact area, internal thread, and hollow-conical cone contact area to reduce wear and installation space, eliminating the need for clamping aids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conical thread is used to clamp the cutting head in the holder, then the cutting head is securely fixed, but the conical form causes the thread to self-tighten during machining, increasing forces in the screwed coupling
Solution Approach 1:
The coupling region is divided into three functionally separate zones: a flat contact area for force introduction, a cylindrical thread carrier for bracing, and a clamping cone for centering. This segmentation allows each element to perform its specific function without interfering with others, preventing the self-tightening effect while maintaining secure fixing.
Solution Approach 2:
The clamping function is extracted from the thread and assigned to a separate clamping cone element. The thread is reduced to purely bracing the flat contact area, removing the harmful self-tightening characteristic while preserving the secure fixing through the dedicated clamping mechanism.
2Reliability
If clamping aids such as clamping pins are used in the coupling region, then the cutting head can be securely clamped, but the structural design becomes more complex and requires additional installation space
Solution Approach 1:
Multiple functions (force introduction, bracing, centering, and clamping) are merged into a unified coupling region design with three integrated elements that work together. This eliminates the need for separate clamping aids while achieving secure clamping through the coordinated action of the flat contact area, thread carrier, and clamping cone.
Solution Approach 2:
The coupling region elements are designed to perform multiple functions: the flat contact area provides both force introduction and bracing, the thread carrier provides bracing and force transmission, and the clamping cone provides both centering and clamping. This multi-functionality reduces the need for additional specialized components.
3Manufacturing precision
If remachining is performed in the coupling region to make the cutting head fit into the holder, then precise fitting is achieved, but laborious finishing operations and additional time are required
Solution Approach 1:
The coupling region elements are designed with precise geometries (flat contact area, cylindrical thread carrier, clamping cone) that inherently provide accurate fitting and centering when assembled. This preliminary design ensures proper fit without requiring subsequent remachining or finishing operations.
Solution Approach 2:
The design parameters of the coupling region (contact area geometry, thread dimensions, cone angles) are optimized to achieve precise fitting through the assembly itself rather than through post-assembly machining. The functional separation allows each parameter to be independently optimized for its specific purpose.
4Reliability
If the external thread and internal thread are designed for high clamping force, then secure fixing is achieved, but wear on the threads increases
Solution Approach 1:
The clamping function is extracted from the thread and assigned to the clamping cone. The thread is reduced to purely bracing the flat contact area, which significantly reduces the load and wear on the threaded connection while maintaining secure fixing through the clamping mechanism.
Solution Approach 2:
The force transmission path is segmented into different elements: the flat contact area and thread carrier handle bracing with minimal wear, while the clamping cone handles the clamping force and centering. This segmentation protects the thread from excessive wear by limiting its function to bracing only.
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 ensures secure, centered, and efficient fitting of the cutting head with reduced wear and installation space, allowing for adaptable thread types based on machining processes, preventing over-tightening and maintaining precise centering.
Implementation Method 1
The clamping cone of the cutting head lies against this cone contact area when the cutting head is screwed into the holder, and spreads the holder apart in the region of this cone contact area
Implementation Method 2
The external thread can be screwed into the internal thread for fixing the cutting head on the holder. The cylindrical thread improves the force transmission here between the cutting head and the holder
Data Source
AI summary
A machining tool includes a holder and a cutting head which can be screwed into the holder. The cutting head includes a cutting-edge region and a coupling region. The coupling region includes a flat contact area facing the holder, a cylindrical thread carrier with an external thread adjoining the flat contact area, and a clamping cone adjoining the thread carrier. The holder includes a planar counter-contact area disposed adjacent the flat contact area of the coupling region, a cylindrical internal thread adjoining the planar counter-contact area, and a hollow-conical cone contact area next to the internal thread.