Solid Carbide Face Milling Cutter with Curved Teeth
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Solution Overview
Problem
Existing face milling cutters face challenges in machining tool steel, experiencing reduced feed rates, vibrations, and tool breakage due to high stress concentrations around screw holes, and lack standardized testing conditions for comparative assessments of tooth shapes.
Innovation Solution
A face milling cutter design featuring radially-curved teeth with specific rake, clearance, and helix angles, made from materials harder than high-speed steel, with a coolant conduit and brazed tungsten carbide cutting portion to eliminate screw holes and enhance wear resistance, optimized for machining hard materials with unique tooth spacing and parabolic shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional face milling cutters with screw-on inserts are used, then the tool can be assembled and disassembled for insert replacement, but the screw holes create stress concentrations leading to tool breakage and vibrations
Solution Approach 1:
The invention extracts and eliminates the screw holes from the cutter body by using a solid carbide construction with integrated cutting edges. The cutting edges are ground directly onto the carbide body, removing the need for separate inserts and screw fastenings, thereby eliminating the stress concentration points that cause tool breakage
Solution Approach 2:
The invention merges the cutter body and cutting edges into a single integrated solid carbide structure. The cutting edges are formed as an integral part of the carbide body through precision grinding, combining the functions of the cutter body and replaceable inserts into one monolithic tool that eliminates weak points
2Productivity
If higher cutting speeds and feeds are used to increase productivity, then metal removal rate increases, but tool wear and breakage increase
Solution Approach 1:
The invention uses solid carbide, a composite material consisting of tungsten carbide particles bonded with cobalt or nickel, which provides exceptional hardness and wear resistance. This material enables the tool to withstand higher cutting speeds and feeds while maintaining edge integrity and resisting wear
Solution Approach 2:
The invention changes the material parameter from high-speed steel or tool steel to solid carbide, which has superior mechanical properties including higher hardness, better wear resistance, and higher thermal stability, enabling operation at elevated cutting speeds and feeds
3Adaptability or versatility
If standard tooth shapes are used for general purpose machining, then the cutter can handle various materials, but performance on hard materials like tool steel is insufficient
Solution Approach 1:
The invention optimizes the tooth geometry with specific parameters including a 45-degree helix angle for reduced vibration, 15-degree rake angle for efficient chip evacuation, and 5-degree clearance angle for proper chip flow. These localized geometric optimizations enhance performance on hard materials while maintaining solid carbide's inherent versatility
4Ease of manufacture
If screw-on inserts are used to reduce tool cost, then initial tool investment decreases, but positioning precision and vibration control deteriorate
Solution Approach 1:
The invention removes the screw-on insert system entirely, eliminating the need for precise hole positioning and insert clamping. The solid carbide body with ground-in cutting edges provides inherent positioning accuracy and eliminates the vibration and loosening problems associated with threaded fastenings
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
The design significantly extends tool life, increases metal removal rates, and reduces wear, outperforming prior art cutters by allowing higher cutting speeds and feeds while minimizing tool breakage and vibrations, especially when machining alloy steels.
Implementation Method 1
a coolant conduit and brazed tungsten carbide cutting portion
Implementation Method 2
brazed tungsten carbide cutting portion
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
The invention relates to tools for the machining of materials by milling. The invention provides an improved form for a rotary cutting tool such as a face end-mill, configured to extend tool life while increasing metal removal rates and reducing tool wear. The invention provides a face milling cutter (10), in the range 4 - 5mm diameter, for fast metal removal having a shank portion (12) adjoining a cutting portion (14), the cutting portion terminating in a plurality of end cutting edges (18) positioned substantially radially from the axis of the milling cutter, the end cutting edges being curved at least along part of their length as viewed facing the end of the milling cutter.