Reaming Tool Assembly With Conical Self-Centering Connection
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Solution Overview
Problem
Existing reaming tools face issues with imprecise connections between the cutting and clamping parts due to thermal expansion during carbide tip coating, leading to deformation and incorrect tool function, and existing solutions are either expensive or difficult to produce.
Innovation Solution
A reaming tool design featuring a monolithic sintered carbide cutting part with a precise coaxial connection using a clamping screw and conical surfaces, along with a dismantling key for secure assembly and disassembly, ensuring precise alignment and simplified production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbide tips are attached by soldering at high temperature and then coated with wear-resistant coatings, then the cutting part gains enhanced durability and cutting performance, but thermal expansion causes deformation of the cutting tips leading to incorrect tool function
Solution Approach 1:
The cutting part is divided into separate carbide tips that can be independently positioned and fixed on the steel body, allowing each tip to be precisely located before assembly. This segmentation enables the tips to be arranged on a precision-machined template and fixed with adhesive, ensuring their relative positions remain stable during subsequent coating processes.
Solution Approach 2:
A precision-machined steel body serves as an intermediary structure between the carbide tips and the final coated assembly. The steel body provides a stable, precisely machined base with threaded holes and mounting features that hold the carbide tips in their correct positions during assembly and coating, preventing thermal expansion-induced misalignment.
2Manufacturing precision
If the cutting part is made from a monolith of sintered carbide, then thermal expansion deformation is eliminated, but production costs increase significantly
Solution Approach 1:
The cutting part uses a composite construction combining steel and sintered carbide materials. The steel body provides the structural framework with precise threading and mounting features, while the carbide tips provide the cutting functionality. This composite approach allows each material to be used where it is most effective, avoiding the need for expensive monolithic carbide while maintaining precision.
Solution Approach 2:
The invention changes the material parameter from monolithic carbide to a hybrid steel-carbide construction. By using adhesive bonding instead of high-temperature soldering, and by providing precise mechanical定位 features in the steel body, the system achieves the same precision outcome with lower-cost materials and processes.
3Manufacturing precision
If a threaded coupling with conical surfaces is used to connect the cutting head and holder, then a very precise axial connection is achieved, but the device complexity increases
Solution Approach 1:
The connection interface uses conical surfaces instead of flat or cylindrical interfaces. The conical geometry provides self-centering and automatic alignment when the components are assembled, ensuring precise axial positioning without requiring complex adjustment mechanisms or multiple alignment features.
4Manufacturing precision
If alignment shanks are provided for precise clamping of the reaming bit, then coaxial alignment is improved, but the production difficulty increases significantly
Solution Approach 1:
The steel body serves multiple functions: it provides the structural support, contains the threaded holes for fixing carbide tips, provides the conical connection interface for the holder, and incorporates the alignment features. This multi-functionality eliminates the need for separate alignment shanks, reducing production complexity while maintaining precision.
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
Achieves a cost-effective and precise coaxial connection between the cutting and clamping parts, maintaining tool functionality while simplifying production and assembly processes.
Implementation Method 1
the conical protrusion in the face of the cutting head fits without clearence into the conical opening in the face of the holder, thus achieving a very precise axial connection between the two parts of the reaming tool
Implementation Method 2
a threaded coupling is provided. The threaded coupling has two opposing threaded parts which are provided as external threads with opposite orientation and which interact with the internal threads of the tool holder and the cutting head
Data Source
AI summary
Assembly of a reaming tool, that includes a clamping part, a reaming bit and a dismantling key. The clamping part is provided with a driving pin and with a hollow seating central protrusion. The reaming bit is provided with a central through opening for depositing on the seating central protrusion of the clamping part. On a cutting part a frontal surface is provided with a central axis on which a through conical opening is provided. On the clamping part of the reaming tool a frontal abutting surface is provided. In the central axis of the clamping part, there is a tubular conical protrusion, whose apex angle is smaller than the apex angle of the through conical opening. On the frontal abutting surface of the clamping part at least one recess is provided corresponding in shape to the functional part of the dismantling key.