Tungsten Information

Tungsten Carbide Saw Blade’s Common Specifications

Published on 07 November 2014

Tungsten carbide saw blade has many types of specifications, and some common ones will be introduced in the following.

Generally speaking, left and right teeth should be applied in the sawing of chipboard and particleboard of medium density, while horizontal ladder tooth is normally adopted in the sawing of laminated board and fire-proof plate. The external diameter of tungsten carbide saw blade is often with Ф300-350mm according to different types of circular sawing machines and the saw blade thickness is connected with diameters (Ф250-300mm with a thickness of 3.2mm and over Ф350mm with a thickness of 3.5mm). Computer-controlled material handling machine usually adopts tungsten carbide saw blades with larger diameter and thickness (350-450mm of diameter and 4.0-4.8mm of thickness) due to its high power of sawing, and normally applies horizontal ladder tooth to reduce chipping and saw notch. As for maintaining a smooth grooving in the slot base, flat teeth or composite tooth form of left and right teeth should be adopted.

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How to Identify High-quality Tungsten Carbide Saw Blade

Category: Tungsten Information

Published on 07 November 2014

Tungsten carbide saw blade, made up of saw blade and saw teeth, is especially used for cutting and grooving metal materials. Its quality is closely related to the product quality, so, how to identify high-quality tungsten carbide saw blade?

The alloy particles contained in high-quality saw blades is thicker and larger which allows for many times of cutter sharpening on carbide teeth and longer service life. The welding quality of tungsten carbide is also very important. Thin and uniform welding lines are required, which can enable the saw teeth to withstand larger cutting force. Also, a high-quality saw blade is also very essential, because it adjusts the rotation, and should not only pass the cutting force, but also maintain the working stability. High-quality tungsten carbide saw blades has static geometry size, accuracy and dynamic performance as well. When the saw blade conducts cutting continuously, the heat generated will be passed to saw blade and lead to its increasing temperature, under which, a high-quality saw blade can still remain its precision while the inferior one will warp and has lower precision.

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Tungsten Carbide Titanize Cutting Tool Cutting Fluid Usage Problem

Category: Tungsten Information

Published on 07 November 2014

Tungsten carbide cutting tool, in recent years, is widely applied in the machinery processing. But due to its high price, the operators often adopt cutting fluid in its machining in order to save tools and improve machining speed, which has caused a lot of problems to the machine tool maintenance.

Generally speaking, cutting fluid can help improve cutting speed, especially of high-speed steel cutting tools, with an average increased speed rate about 30％～40％. However, when it comes to tungsten carbide titanize cutting tools, whether to apply cutting fluid or not has to be considered carefully. The reasons are as follows:

I. Tungsten carbide titanize cutting tool can withstand high temperature up to 1 000℃, but the cutting fluid can only lower the tool temperature by 60～90℃, which is of almost no influence on the tool.

II. Tungsten carbide titanize cutting tool has high cutting speed and high cutting temperature as well, under which, cutting fluid oil film will be damaged and achieve a poor lubrication.

III. Then cleaning effect of cutting fluid is still of some help to tools, but the dirt washed away will do harm to sliding boxes and tool carriers, which has poor leakproofness, and thus lowers the machine tool precision.

IV. Many operators tend to add water to it during machining, which causes that cutting fluid not only has no rust prevention ability, but also lead to rust forming on workpiece and machine tools.

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Tungsten Carbide Cutting Tool Crack Analysis

Category: Tungsten Information

Published on 07 November 2014

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

Category: Tungsten Information

Published on 07 November 2014

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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How to Build Nail-Worm System

Category: Tungsten Information

Published on 07 November 2014

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 (II)

Category: Tungsten Information

Published on 06 November 2014

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

Category: Tungsten Information

Published on 06 November 2014

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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Tungsten carbide plane cutter planing Introduction

Category: Tungsten Information

Published on 06 November 2014

Tungsten carbide plane cutter, with one cutting part, is a kind of cutter that is used in planing. Planing is the most common machining method in unit production. Planer types most commonly seen include shaper, double housing planer and slotting machine. Planing’s main movement is variable speed reciprocating linear motion. Due to the inertia during speed changing, the cutting speed is limited. Also, because planing does not conduct cutting in its return trip, it has relatively low production efficiency. However, planing only requires for simple-structured machine tools and cutting tools which are easy to be installed and adjusted, so it has high universality.

Due to its characteristics, tungsten carbide plane cutting planing mainly used in plane processing and also widely applied in straight groove processing, such as right-angled groove, dovetail groove T-shaped groove, etc.

The technical characteristics of tungsten carbide plane cutter planning:

I. High universality

II. Low efficiency

III. Low machining precision

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Can Cutting Fluid Be Used in Tungsten Carbide Cutting Tool

Category: Tungsten Information

Published on 06 November 2014

Tungsten carbide cutting tool normally do not adopt cutting tool for cooling during machining. It is because that tungsten carbide is of high hardness (aboutHRC90), and can allow high cutting temperature (up to 1000℃), so the absence of cool fluid does not affect its cutting. In addition, due to its sensibility towards to shock heating, adopting cutting fluid may caused its tipping.

So, is that true that tungsten carbide cutting tools absolutely do not allow for the adopting of cutting fluid during cutting? The answer is yes, but it is conditional. Operator should pay attention to some points as follows if they want to apply cutting fluid in the cutting:

I. Using oil-based metal cutting fluid with antiwear additive

Oil-based metal cutting fluid has poor heat conduction property, and thus will not cause shock chilling on the tool. Also, oil-based metal cutting fluid can easily stick to the tool and thus help to keep a stationary temperature for the tool.

II. Cooling tungsten carbide cutting tools evenly

The cooling towards cutting tools by cutting fluid should be done evenly in case of tools being hot and cold and finally results in tool tipping.

III. Cooling tungsten carbide cutting tools in the whole process

Before the cutting starts, the operator had better open the cutting fluid in advance and the cooling fluid should be adopted in the whole cutting process without stops.

The cutting fluid, if used properly with the above mentioned points, can not only protect tungsten carbide cutting tools, but also improve the cutting precision, because the oil-based metal cutting fluid, when used in the cutting to cool the tools, can also lubricate the tools and the machining areas of workpieces and thus improve the surface machining quality.

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