Two Common Tungsten Carbide Cutting Tool Cracks

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Category: Tungsten Information
Published on Wednesday, 12 November 2014 19:10
The reasons for tungsten carbide cutting tool cracks are quite complicated, but can be generally classified into two main categories, which are hot crack and grinding crack.
 
I. Hot crack
Hot crack is mainly caused by the internal stress generated in the welding and heat treatment of tungsten carbide cutting tool blade. The common factors for welding stress concentration include: low toughness of tungsten carbide itself, poor thermal conductivity, instantaneous stress caused by great temperature difference, mismatching of the thickness ratio between the blade and the blade width, and so on.
 
II. Grinding crack
Tungsten carbide cutting tools are very sensitive towards thermal stress and thermal deformation. Because its tensile strength is just 1/5~1/8 of its compressive strength and it has uniform hard particle distribution, great grinding force and high cutting temperature, the grinding stress is easily produced. Tungsten titanium has strength lower by about 60% than tungsten-cobalt alloy, and it is brittle with poor thermal conductivity, so it is more sensitive to thermal stress. It unsuitable grinding tools are used or there is too large grinding amount during grinding, large thermal stress will be produced, which will cause grinding cracks or even blade tipping.
 
Tungsten Carbide Cutting Tool
 
 
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Tungsten Carbide Indexable Insert Advantages

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Category: Tungsten Information
Published on Wednesday, 12 November 2014 19:03
Tungsten carbide indexable inserts’ advantages are reflected in the following points:
 
(l) High blade durability
Tungsten carbide indexable inserts are clamped on toolbars by using mechanical method. Because the blade does not take heat treatment, the hardness and cutting properties will not be reduced, and thus the cutting tool can has higher durability.
 
(2) High productivity
Tungsten carbide indexable inserts, with advanced geometry, can adopt relatively larger cutting amount. When its cutting edge is damaged or goes blunt, it can be shifted to another cutting edge quickly, which help achieve higher productivity.
 
(3) Low tool costs
The cost of tungsten carbide indexable cutting tools is about 2/5 of the welded cutting tools; its toolbars can be reused, so the cost is further reduced.
 
(4) Improving working conditions
Tungsten carbide indexable inserts can reduce dust pollution and industrial accidents due to the cutting tool grinding, which help improve the working conditions of workers.
 
(5) Simplifying tool management
Tungsten carbide indexable inserts can achieve multi-purpose usages, which help reduce tool inventory and simplify tool management.
 
In summary, tungsten carbide indexable inserts have been widely used at home and abroad due to its various kinds of advantages.
 
Tungsten Carbide Indexable Insert

 
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Tungsten Finesse Drop Shot Weights

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Category: Tungsten Information
Published on Wednesday, 12 November 2014 08:48

Tungsten finesse drop shot weights are cylindrical with a line guide through their center. It is used as an alternative for Carolina rigging, the weight's profile lets them easily pass through heavy cover and over rocks. The Weights are pegged at a fixed position on the line using specialty stops.

Why Tungsten?

Lead is dead. Lure companies are facing the eventuality of lead bans throughout Canada and the United States. Some states, such as New York, have already banned the use of lead fishing weights in recreational fishing. More lead bans are certain to come.

Tungsten finesse drop shot weights, the most technologically advanced weight available today, provide a more environmentally friendly alternative to lead. Comprised of tungsten, the second hardest substance next to diamonds, tungsten finesse drop shot weights do not add pollutants to water, our most precious resource.

Tungsten finesse drop shot weights which made of tungsten are 25 percent smaller, much more sensitive and emit twice the sound of lead. Their sensitivity gives you the ability to better define under water structure.

Tungsten-finesse-drop-shot-weights


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Tungsten Carbide Double Positive Milling Cutter Introduction

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Category: Tungsten Information
Published on Tuesday, 11 November 2014 18:08

Tungsten carbide double positive milling cutter uses positive inserts held in positive pockets. This is to provide the proper clearance for cutting. Double positive cutter geometry provides for low force cutting, but the inserts contact the workpiece at their weakest point, the cutting edge. In positive rake milling, the cutting forces tend to lift the workpiece or pull the cutter into the work. The greatest advantage of double positive milling is free cutting. Less force is exerted against the workpiece, so less power is required.

Tungsten Carbide Double Positive Milling Cutter


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Tungsten Carbide Double Negative Milling Cutter Introduction

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Category: Tungsten Information
Published on Tuesday, 11 November 2014 17:49
Tungsten carbide double negative milling cutter uses only negative inserts held in a negative pocket. Double negative geometry is one of the industry standard milling cutter geometries. This provides cutting edge strength for roughing and severe interrupted cuts. When determining cutter geometry it is important to remember that a negative insert tends to push the cutter away, exerting considerable force against the workpiece. This could be a problem when machining lightly held workpieces, or when using light machines. However, this tendency to push the work down, or push the cutter away from the workpiece may be beneficial in some cases because the force ends to "load" the system, which often reduces chatter.
 
Tungsten Carbide Double Negative Milling Cutter
 
 
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Tungsten Carbide Milling Cutter Milling Introduction

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Category: Tungsten Information
Published on Tuesday, 11 November 2014 17:28
The two basic tungsten carbide cutting tool types used in metalworking are the single-point and multi-point designs. Fundamentally, they are similar. By grouping a number of single point tools in a circular holder, the milling cutter is created.
 
Milling is a process of generating machined surfaces by progressively removing a predetermined amount of material from the workpiece, which is advanced at a relatively slow feedrate to a tungsten carbide milling cutter rotating at a comparatively high speed. The characteristic feature of the milling process is that each milling cutter tooth removes its share of the stock in the form of small individual chips.
 
Tungsten Carbide Milling Cutter
 
 
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Tungsten Carbide Indexable Cutting Tool’s Productivity Advantages

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Category: Tungsten Information
Published on Tuesday, 11 November 2014 16:52
Tungsten carbide indexable cutting tool is popular with many cutter users mainly due to its advantage in productivity. Using tungsten carbide indexable cutting tools to replace solid tungsten carbide cutting tool can greatly shorten cutting edge replacing time, and thus optimize the machining time. For instance, it would take about 30 minutes to replace solid tungsten carbide drill bits, while it would take only 1～2 minutes to replace drill tip before restarting machining if an indexable drill bit is used.
 
The shortening of the cycling time of machining is another reason why tungsten carbide indexable cutting tool can improve productivity. Using tungsten carbide cutting tool to replace solid tungsten carbide cutting tool can significantly reduce the cycling time of machining. For instance, if using solid tungsten carbide cutting tool during machining, the most of the rough machining should be done when workpieces are relatively soft, and then these workpieces should be sent to take heat treatment and be clamped again. After that, a tungsten carbide end mill is needed to do the finish machining. However, all these can be accomplished in the same tungsten carbide indexable cutting tool.
 
Tungsten Carbide Indexable Cutting Tool
 
 
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Tungsten Carbide Indexable End Mill’s Cost Advantage

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Category: Tungsten Information
Published on Tuesday, 11 November 2014 16:50
Tungsten carbide indexable end mill is suitable for milling shallow grooves, step surface, and boring blind holes. Tungsten carbide indexable end mill has many advantages in cost saving:
 
Firstly, it can reduce the cutting tool replacement cost. Cobalt high speed steel and solid tungsten carbide are relatively more expensive. When they break, the whole cutting tool should be replaced with a new one. Instead, in tungsten carbide indexable end mill, an indexable insert is worth just a few dollars.
 
In addition, tungsten carbide indexable end mill do not need to be reground, which is a labor-intensive and costly work. Also, regrinding may cause damages in cutting tool diameter size. During slotting machining, that would mean extra cost of a finish machining to meet the size requirements.
 
What is more, tungsten carbide indexable end mill has wide universality which helps reduce the cost. In many cases, it can be used in different kinds of workpiece materials and machining just by replacing the blade materials and groove shapes in the same cutter body.
 
Tungsten Carbide Indexable End Mill
 
 
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Tungsten Carbide Indexable Turning Tool Lever-type Clamping Introduction

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Category: Tungsten Information
Published on Tuesday, 11 November 2014 16:48
The lever-type clamping structure of tungsten carbide indexable turning tools is the most commonly used clamping structure at home and abroad, in which the blade is clamped to the toolbar according to lever principle. When the operator turns the screw, the clamping force will be produced through the lever, and then the blade will be located in the cutter groove side. When the operator removes the screw, the blade will be loosened, and the semicircular cylinder-shaped leaf spring can keep the shim position still. In this structure, due to the leverage, the blade can get acting force in horizontal direction during clamping, which can press one side of the blade onto the side of cutter groove. Through this, the blade can be tightly clamped.
 
The characteristics of lever-type clamping structure of tungsten carbide indexable turning tools: high location precision, firm clamping, reasonable stress, convenient in use, poor manufacturability. It is more suitable for mass production.
 
Tungsten Carbide Indexable Turning Tool
 
 
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Tungsten Carbide Indexable Turning Tool Eccentric Clamping Introduction

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Category: Tungsten Information
Published on Tuesday, 11 November 2014 16:46
Eccentric clamping structure of tungsten carbide indexable turning tools has gained increasingly wide applications due to its advantages of simple structure, convenient and reliable clamping and so on.
 
In the eccentric clamping structure of tungsten carbide indexable turning tool, blade is clamped to toolbar by using an eccentric pin on the upper screw. This structure is convenient to operate but can not perform bilateral positioning.
 
When the eccentricity is too small, it requires higher blade precision, but when the eccentricity is too large, the blade may be easily loosened under the impact of cutting force. Therefore, the eccentric clamping structure of tungsten carbide indexable turning tools is more suitable for continuous smooth cutting.
 
Tungsten Carbide Indexable Turning Tool
 
 
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