Thread Milling Cutter Edge Geometry to Resist Deflection
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Solution Overview
Problem
Thread milling cutters tend to deflect from the central axis of internal threads due to radial forces, leading to reduced tool life.
Innovation Solution
The thread milling cutter design includes end cutting edges with specific angles and dimensions, such as a first end cutting edge forming an angle of 6° or less with a perpendicular plane, and a second end cutting edge angled more towards the rear, along with a diameter configuration that enhances axial bracing force and reduces cutting resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If end cutting edges are added to eliminate pre-drilling, then drilling and threading can be performed simultaneously, but the tool tends to deflect from the central axis due to radial forces, reducing tool life
Solution Approach 1:
The patent changes the geometric parameters of the end cutting edges, specifically setting the angle between the imaginary plane perpendicular to the axis and the first end cutting edge at 6° or less, and the second end cutting edge at a greater angle. This parameter optimization balances the axial bracing force generation with cutting resistance reduction, resolving the deflection problem while maintaining simultaneous drilling and threading capability
Solution Approach 2:
The patent applies different angle characteristics to different portions of the end cutting edges. The first end cutting edge has a smaller angle (6° or less) to generate axial bracing force, while the second end cutting edge has a larger angle to reduce cutting resistance. This local differentiation of geometric properties allows the tool to simultaneously achieve deflection resistance and reduced wear
2Force
If the angle between the end cutting edge and perpendicular plane is reduced to strengthen axial bracing force, then deflection resistance improves, but cutting resistance may increase
Solution Approach 1:
The end cutting edge is segmented into two distinct portions: the first end cutting edge with a smaller angle (6° or less) optimized for generating axial bracing force, and the second end cutting edge with a larger angle optimized for reducing cutting resistance. This segmentation allows each portion to perform its specific function optimally without compromising the other
Data Source
AI summary
The end cutting edges formed on the front end face of the tool body includes a first end cutting edge that is connected to the front end of the thread cutting edge, and a second end cutting edge that is connected to the first end cutting edge on the side closer to the axis, and is angled more toward the rear end than the first end cutting edge. The angle formed by an imaginary plane perpendicular to the axis and the first end cutting edge is set to 6° or less. The angle formed by the second end cutting edges and the imaginary plane perpendicular to the axis and is set to be greater than the angle formed by the first end cutting edges and the imaginary plane perpendicular to the axis.