Flank wear is referred to the wear eroded by the portion of the tool in contact with the finished workpiece, which is an important factor to examine the life of coated tool.

In the research , if the TiC coated tungsten carbide inserts’ coating thickness is 4.71um while the TiN coating ones having a thickness of 2.09um are put into the turning operations, it could be observed that the flank wear growth in inserts having TiN coating appears to be much faster till the tool failure.  

Besides the thickness issue which maybe likely to cause the rapid wear growth of TiN coated inserts,  the other factors such as temperature and heat are identified to have a possibility to be attributed to faster failure of tool life. Since turning operations typically involve with high interface temperature and a large amount of heat and high speed, which may cause reduction of coating hardness and hence resultant of low wear resistance. In addition, the large heat would soft the substrate and cause cutting edge thermal deformation, which also adds to the failure of coated tungsten carbide inserts. 

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Crater wear is the wear caused by cutting chips contact with cutting tool erodes the rake face.It is known that the crater wear is normal for tool wear, and until it become serious enough to cause a cutting edge failure, it does not largely affect the use of a tool. And for which, the crater wear could be a factor to examine tool life.

In the turning operation test, when the TiC coated tungsten carbide inserts’ coating thickness is 4.71um while the TiN coating ones having a thickness of 2.09um, as the growth of the crater wear, the tungsten carbide inserts with TiC coating appears to have a relatively longer tool life before tool collapses. In addition, it could be examined that until 1250 seconds there is scarcely any growth of carter wear in TiC coated tungsten carbide insert, and after that a slow growth of this wear till tool failure. Interestingly, a similar growth of carter wear in tools having TiN coating is identified, although it has a relatively low tool life .


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Since the tungsten carbide tipped tool’s condition is a vital factor to maintain consistent quality of cutting effect in metal cutting process, it is necessary to match the tipped tool with cutting fluids to optimum the metal removal rate and extend the tool life.

In general the cutting fluids are designed to lubricate and cool the cutting chip, as well as tool interface. It could also help the tungsten carbide tipped tool to reduce the tool wear due to friction and abrasion, which in addition to improve the finishing of the workpiece surface. There are several approaches for the cutting fluids to reach the chip tool interface, like capillary action by which the fluids diffuse through the highly distorted structure of metal.


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High material removal rate, good surface finish and low tool wear are the three major requirements during the machining processes. As an important and easy way to achieve these targets, the correct selection and use of cutting fluids could make an effort to enhance the performance of tungsten carbide tipped tools.

The effect of some cutting fluids include paraffin, soluble oil on the flank wear of tungsten carbide tipped tools to machine aluminum, brass workpieces could be indicated as follows, in general the tungsten carbide tipped tools exhibit better flank wear resistant compared other materials, and the soluble oil with 20% concentration is likely to offer smallest flank wear, which is 0.002mm, for machining aluminum workpiece among the cutting fluids. In addition, when tungsten carbide tipped tool employed by the soluble oil is observed to have a capability to provide a longer tool life as well as better surface finish for all workpieces.


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Packing: in iron drum with double inner plastic bag of 50kgs or 200kgs net each.

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Packing: in iron drum with double inner plastic bag of 50kgs or 200kgs net each.

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Morphology, composition and microhardness of oxide coatings formed during DC plasma electrolytic oxidation (PEO) of aluminium in sodium tungstate were investigated. Oxide coatings were characterized by optical emission spectroscopy, AFM, SEM–EDS and XRD. Oxide coatings morphology is strongly dependent on process duration, while microhardness decreases with extended PEO time. The microdischarges characteristics were studied as well and it is shown that size of microdischarges becomes larger, while the surface density of microdischarge sites becomes lower, with increasing PEO time. Optical emission spectrum of microdischarges has several intensive band peaks caused by electronic transition in Al, W, Na, O, H atoms.

 

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Spray drying is a wide applied process in liquid process shaping and drying industry. It can be used to transform solution, emulsion, suspension and paste liquid into powder and granular solids. When the finished particle size distribution, residual moisture content, density and particle shape must meet with precise standards, spray drying becomes an ideal method.  

Ammonium metatungstate spray dryer principle: After filtering and heating, air goes into the dryer at the top of the air distributor, hot air spirals evenly into the drying chamber. Liquid goes through high-speed centrifugal atomizer at the top of the tower body (rotating) into a very fine vaporous liquid bead, contact with the hot air, being dried as finished product in a short time.

Ammonium metatungstate spray dryer feature:

1.High drying speed. After liquid be vaporous, superficial area increases, the instantaneous evaporation can be 95% -98% of the water in the hot air flow. It only takes a few seconds to finish drying process.

2.Finished product has good uniformity, flow ability and solubility. They are of high purity and quality.

3.Producing process is being largely simplified and it is easy to operate. It can dry the products which the moisture content is 90% in a very short time.



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Ammonium metatungstate is a tungsten chemical in the form of highly soluble hydrated crystals, it is white or slightly yellow crystals which has no harmful components and slightly acidic. Due to its solubility in water, it can be used as raw material to produce tungsten trioxide.

Use ammonium paratungstate as raw material and heat to 220-280℃. After that it will lose ammonium and crystal water and transform into ammonium metatungstate. Continuously heat ammonium metatungstate to 600℃ until it loses all ammonium and crystal water, cool it down and crystallize, after spray drying it turns into yellow tungsten trioxide.

Ammonium metatungstate preparing tungsten trioxide is easy to operate, the finished product is of good uniformity. Tungsten trioxide can be used to made tungsten product and shielding matirials which is widely used in industry.



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Hard metal contains about 90% tungsten carbide. In an investigation of the skin of 853 individuals who are still working or had previously worked in hard metal manufacture. Sodium tungstate was in included in a patch test with a panel of substances from the environment of the employees. No allergic reactions to tungstate were found. However, irritant pustular reactions appeared in 2.0% of the patch tests. The pustular reactions were often reproducible.

 

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