Tungsten Carbide Hole Boring Cutter’s Structural Improvement (I)

Details: Category: Tungsten Information; Published on Thursday, 06 November 2014 18:32

Tungsten carbide hole boring cutter, applied in coal mining machinery parts processing, may come across parts of many Thin-walled inner hole surface. The machining of thin wall inner hole parts is quite difficult. If tungsten carbide hole boring cutter of common structure is in applied in the machining, workpieces always tend to have chatter marks and off-size and even deformation, and so on, which will result in low machining precision and low machining efficiency.

To ensure the machining quality of parts, the tool design and technology consistency must be improved.

I. Structural improvement

1. Geometric angle setting

(1) In order to increase the tool toughness, clearance angle should be reduced. Also, the second clearance angle should be increased in case that the clearance angle of tungsten carbide hole boring cutters rub workpieces.

(2) When the tool start cutting the workpiece, it suffers great impact load and thus the rake angle should be decreased to reduce impact load.

(3) Reducing tool minor cutting edge angle will have good effect in surface roughness.

(4) Adopting tool cutting edge angel of 91~ 95°and reducing radial force during machining can reduce workpiece vibration.

2. Blade parameters setting

(1) The toolbar size and structure of tungsten carbide hole boring cutter should have high toughness and intensity. In order to avoid chatter marks and cutter back-off during machining, the toolbar diameter of the hole boring cutter should be increased to ensure the tool bar toughness.

(2) Increasing the corner radius, normally not less than 1mm.

(3) Grinding out a chamfer larger than feeding rate f can improve he surface finish of workpieces and reduce vibration.

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