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Tungsten Carbide Cutting Tool Crack Analysis

Details: Category: Tungsten Information; Published on Friday, 07 November 2014 16:47; Written by xjq; Hits: 467

The higher intensity the tungsten carbide cutting tool has, the lower the risk that it will produce cracks. However, in the actual production process, even the carbide material with highest intensity and abrasion resistance will produce cracks. So, what are the reasons for this?

Tungsten carbide cutting tool cracks are formed because the welding stress exceeds the intensity limit of tungsten carbide cutting tools. If the tungsten carbide cutting tool bends, then there will be tensile stress along the direction of carbide blade thickness. When the cutting tool is welded, it is not conducted on the same plane, but on several planes. In addition, when tungsten carbide suffers rapid heating or cooling, the blade surface temperature will be pretty unevenly and thus obvious instantaneous stress can happen, which will easily results in tungsten carbide cutting tool cracks. Therefore, the heating or cooling of the cutting tools should be conducted slowly.

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Tungsten Carbide Drill Bit Selecting

Details: Category: Tungsten Information; Published on Friday, 07 November 2014 16:45; Written by xjq; Hits: 544

Tungsten carbide drill bit is a kind of cutting tool used in the drilling of through-holes and blind holes in solid materials, or the chambering of the existing holes. During tungsten carbide drill bit selecting, the factors as follows should be taken into consideration.

I. Machining stability

When selecting tungsten carbide drill bits, the stability of machine tools should be considered. And therefore, the principal axis, fixture of machining tools should be tested. In addition, the stability of drill bit itself should also be considered.

II. Generally speaking, the smaller the hole diameter is, the smaller the tolerance is. The solid tungsten carbide drill bit, with the highest machining precision, is the best choice for machining high precision holes, while the welded tungsten carbide drill bit is more suitable for the machining of holes of common precision requirement. Tungsten carbide indexable drill bit, with lower machining precision, is generally used in the machining of holes with low precision requirement.

III. Machining cost of each hole

The productivity and machining cost of each hole are the most important factors in drilling machining. In order to improve productivity, tungsten carbide drill bit manufacturers are dedicated to the studies on machining methods of many operation sequences and develop drilling tools with higher feeding rate and higher revolving speed.

IV. Chip removal and cooling fluid

Chip removal problem should be attached much more importance on the tungsten carbide drill bit selecting. In fact, the most commonly seen problem in drilling is chip removal difficulty. In addition, proper cooling fluid types, flow and pressure that match the drill bit diameter should be chosen.

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

Details: Category: Tungsten Information; Published on Thursday, 06 November 2014 18:35; Written by xjq; Hits: 512

II. Technology consistency improving

(1) Reducing the surface roughness of the cutting edge and rake face to keep the tool smooth, clean and sharp.

(2) Installing the blade firmly. The toolbar should not stretch too far out of the knife rest to avoid toolbar deformation.

(3) Installing the toolbar straightly incase that the toolbar touch the surface processed.

(4) During tool setting, the tool nose of tungsten carbide hole boring cutter should a little higher than centre of gyration of workpiece (but should be controlled within 2mm) to reduce vibration and breaking edge and avoid that the bottom of boring cutter touch the hole wall and reduce machining precision.

(5) As to machine tools, the spindle clearance should be adjusted to the bearing precision.

After the improvement of tungsten carbide hole boring cutter structure and technology consistency, the vibration is reduced, the tool toughness is improved, and the problems of chatter marks, off-size, deformation etc. are basically avoid, which helps improve the machining quality of thin wall inner hole and its machining efficiency.

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How to Build Nail-Worm System

Details: Category: Tungsten Information; Published on Friday, 07 November 2014 08:51; Written by Sherry; Hits: 540

First prepared the tools you will need to rig and fish the new Nail-Worm system: Prowled Plastic welding tool, straight Tail, Owner weedless wacky hook and the most important is tungsten nail weight.

Then take the worm and cut two rings off the nose of the worm, approximately 1/8".

And insert the tungsten nail weight into the head of the work pressing it completely in, burying it.

Finally use the wormier and melt over the top of the worm head so the nail will not come out .See illustration for proper hook rigging.

worm-nail-system

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

Details: Category: Tungsten Information; Published on Thursday, 06 November 2014 18:32; Written by xjq; Hits: 521

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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