China tungsten carbide cutting tools industry status mainly in the following two ways:

First, China tungsten carbide cutting tools industry status reflects in that even though several large companies in the country can produce high strength, high hardness ultrafine alloy, it is difficult to meet the automotive, aerospace large manufacturing of tungsten carbide cutting tools of high strength, high wear resistance, high stability requirements. Although domestic tungsten carbide cutting tools in the price of imports relative to the tool by the advantages, however, the stability is at a disadvantage.

Secondly, China tungsten carbide cutting tools industry status reflects in that the researches on tungsten carbide cutting tool are relatively backward. Domestic researches on cemented carbide tool data has not been a big investment, the study on tungsten carbide cutting tools process is little, tungsten carbide cutting tools design also stays in the mapping, generic, low-level substitute imported products.

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Inserts welded of tungsten carbide cutting tools is a very important process. Due to chemical composition and mechanical properties of carbide and steel is completely different, often in the welding prone to cracking and welding which makes tungsten carbide cutting tools scrapped.

Tungsten carbide cutting tools welding crack caused by excessive stress. After sufficient heating, tungsten carbide cutting tools cooling starts, weld solidification. Since the thermal expansion coefficient of steel is 2-3 times larger than the carbide to produce different shrinkage in steel and cemented carbide, after reaching room temperature, the contraction of steel when carbide twice. The result is a gradual contraction tensile stresses in the tungsten carbide cutting tools which results in tungsten carbide cutting tools welding crack. Further, in the cemented carbide 950 ° C-1100 ° C will produce vigorous oxidation, the oxide film formed brittle carbide leaving many voids, thereby reducing the mechanical properties of tungsten carbide cutting tools. Thus, during welding, it is necessary to avoid oxidation of the welding area.

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As lather boring is a cutting process to generate conical or cylindrical surfaces on a pre-existing hole in a workpiece, the tungsten carbide cutting tools applied on are usually single-point cutting tools or boring head.



Lathe boring usually requires that the workpiece be held in the chuck and rotated. As the workpiece is rotated, a boring bar with an carbide insert attached to the tip of the bar is fed into an existing hole. When the tungsten carbide cutting tool engages the workpiece, a chip is formed. For non-tapered holes, the cutting tool moves parallel to the axis of rotation. For tapered holes, the cutting tool moves at an angle to the axis of rotation.

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It is known that boring is a process meant to increase a pre-existing hole in the machining. Usually ,tungsten carbide boring cutter is a single point cutting tool , made from carbide. The adjustable dimensions between the pieces and the tool bits enable the vertical cutting and horizontal cutting into internal surface.



The design concepts of boring cutter related to lower the product tolerances on holes that already have been drilled are need to be addressed. First, large length-to-bore-diameters are not preferred due to cutting tool deflection. Next, through holes are preferred over blind holes (holes that do not traverse the thickness of the work piece). Interrupted internal working surfaces, where the cutting tool and surface have discontinuous contact are preferably avoided. The boring bar is the protruding arm of the machine that holds cutting tools, which should be very rigid.


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Tungsten carbide gun drill is a straight fluted drill with coolant holes in drill’s body, which is able to let cutting fluid like compressed air and suitable liquid to be introduced through a small hole within the tool. Compared with the metal tips, it adopts carbide tips to lower the total cost and extend the service time. The coolant hole in the hollow body plays roles of removing the cutting chips and offering lubrication as well as cooling to the cutting edges.



Tungsten carbide gun drill owns ability to drill long straight holes no matter in metal, plastic or wood. Differently from standard twist drill, gun drilling finely solves the problem related to drill holes with accurately size and straight. Gun drilling was well developed and available to drill a long and straight hole over a range of depths and diameters.


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The deep hole drilling processes are separated by the ways cutting coolant removes heat and flushes the chips. Generally ,While using tungsten carbide cutting tools, the deep drilling types are fallen into three categories,

Gun Drilling

The tungsten carbide cutting tool is a fluted solid rod uses carbide tips and recognized as a straight fluted drill with ability to offer the coolant entry and chip removal. Coolant is injected through the center hole, when it flows back outside the drill, the chips and the heat are removed.

Boring and Trepanning Association

The tungsten carbide cutting tool is a tube. Coolant enters around the cutting tool surface and removes the chips out through the center tube. The acceptable minimum sizes of diameter is over15.6mm ,since the technology limitation.BTA drilling becomes more effective than gun drilling around a 50mm hole diameter.

Ejector System

The cutting tool is a set with two nested tubes.Coolant is carried through the smaller tube to the cutting face and the cutting chips are removed via bigger tube.


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Tool Holder Selection

The recommended  types of tool holder for the tungsten carbide cutting tools comprise collet chuck, side handle and hydraulic chuck. On the contrary, quickly change chuck is not suggested.



Proper Cooling Process

In order to ensure the tungsten carbide drill bits could work functionally, special attention needed to be paid to the directional combination of cooling as well as the upper and lower echelon configuration during the external cooling. In terms of inner cooling, the pressure and flow rate are the vital parts. Attention also needed to be draw for the leakage of the cooling liquid.

Beside all the aspects listed above, the right drilling technology also play an important role in the selection procedure.


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As one of the most popular solid carbide cutting tools , tungsten carbide drill bits are widely used in various machining processes.Understanding how to correctly use the drill bits could improve the efficiency of the working process and also making all the material resources into good account. The aspects related to correctly use tungsten carbide drill bits include,



Right Machine Tool Selection

High power and good rigidity are the characteristics of machine tools suggested to be contained. The low power and poor precision ones like radial drill and universal milling machine should not be in the list of machine tools selection,as they may easily cause the tungsten carbide drill bits deformation and breakage.


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4.The tungsten carbide cutting tools must be away from corrosive atmospheric and properly stored in a dry environment after use.

5.When using tungsten carbide cutting tools some cutting chips might be generated, for safety consideration, the labor protection articles and use instruction are required.



6.Cutting fluid is recommended, since its related to the tungsten carbide cutting tool lifetime , to an extend.

7.If the cracks occurred during cutting process, stop using the cutting tools.

8.Let the specialists grind the tungsten carbide cutting tools, when there’s an edge passivation or strength reduction .
 

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Each year, the worldwide tungsten carbide industry generates large amount of scrap because of the parts rejected at different stages of the manufacturing and worn-out or broken tungsten carbide cutting tools.

Differently from basic recycling approach of scrap pieces, instead of breaking them into powders, the chemical approach (Zinc recovery process, electrolytic recovery and etc.) could solve some problems including avoiding the recycling equipment wear. But the there is still a considerable shortcoming related to the recycling rate of WC-Co, which is less than 20%. The improved method in nowadays is using molten-zinc (Zn) bath to recovery WC and Co from the hard cutting-tool scraps.


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