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Poor chip removal leads to thread defects
Spiral grooves block chips, causing tooth decay, skewed threads, or surface scratches. Adhesive materials such as stainless steel and aluminum are prone to forming "chip lumps"
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Tool wear
When tapping high-strength steel (such as 45 #, alloy steel) or titanium alloy, the tool generates high temperature due to friction, resulting in blade wear; Hard materials (such as HRC50+) are prone to causing tap breakage or spiral groove wear
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Heat treatment is prone to deformation and has poor dimensional stability
After tapping the cast iron parts such as the gearbox housing, the aperture expands due to the release of residual stress. After pre-processing and quenching of mold steel, the shrinkage rate of the inner hole is uneven
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Hole accuracy and axis deviation
Thin walled parts (such as aviation aluminum alloys) are prone to "horn mouth" or "pitch error" during tapping due to vibration