November 24, 2017

A solid carbide drills (CoroDrill 860) with the fastest cutting speed

We know that the carbide drillsbit can greatly improve the productivity and reduce the cost of each hole processing. CoroDrill 860 is the most rapidly cutting solid carbide drill bit in the market, mainly used for drilling of steel. The drill is well suited for conventional drilling, chamfering hole, inclined surface drilling, drilling cross hole, diamond laminated plate and concave surface borehole etc. In the aspect of hole processing performance, CoroDrill 860 is a new revolution. CoroDrill 860 bit of optimized design, can achieve much more than many of the common drill hole penetration rate and the processing safety - which means that it has the strength to improve reliability under the highest cutting parameters.

This kind of drill is specially designed for machining steel parts, which is suitable for machining of conventional drilling, chamfering, inclined surface, cross hole, pile drill and concave/convex surface. When using high cutting parameters for long or short cutting materials, this kind of carbide drill cuttings control is excellent and can achieve consistent and unfault-free drilling.

And processing all kinds of steel materials under high cutting parameters when chip control is very good, because CoroDrill 860 bit unique channel combined with a new chip groove, even under very high penetration rate can be achieved efficiently chip removal, it ensures the efficient and safe drilling.

The small features of the 860 cutting force of CoroDrill mean that the load on the cutting edge is also small, which is not easy to be problematic when the parts or thin-walled parts are poorly processed. Currently available, 3 ~ 8 times the diameter of the gage length range bit, chip can be used in long and short of scrap materials processing, such as alloy steel, low carbon steel, low alloy steel, high alloy steel and steel castings, etc. The standard diameter range is 3 ~ 20 mm, and the obtained hole tolerance is 8 ~ IT9.

Summary CoroDrill 860 solid carbide drills

The technical features of the head are as follows:

Unique new cutting edge shape can reduce cutting force and improve chip control.

The chip groove shape optimizes the chip forming, which improves the chip flow and chip removal.

The high toughness new tungsten carbideextends the cutter life;

The blade handle can control wear and provide higher reliability;

The enhanced bit round Angle improves the strength and the processing safety.

CoroDrill 860 reduces the processing cost of each hole, improves performance reliability, can achieve higher cutting parameters, and optimizes the performance of chip removal. Long tool life, wear and control.


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November 23, 2017

The influence of cooling strength on the precision casting of aluminum carbide

The old precision casting method USES the fractional crystallizer, especially when casting flat ingots. The water jacket and the crystallizer are separate. With the development of casting technology, the crystallizer of modern precision casting method is one. Use old mold casting cooling water consumption is large, when because the old mould water supply is not closed, open fire and not part of the cooling water cooling, and a cooling and cooling of the secondary cooling intensity difference, inevitably produce some casting defects; And when the modern crystallizer is cast. Cooling water consumption is small. It has been proved that it is only about 70 percent of the amount of water used in the old mold. Currently abroad with low liquid level casting crystallizer, its purpose is to improve the cooling intensityof aluminum carbide, reduce or eliminate a cooling after the heating phenomenon of the air gap area, so almost no secondary cooling quenching condition, flat ingot casting ordinary have mould height fell to 100, of course, this requires the operator has a high operating level or add white liquid level control system.

 

The cooling water temperature requirement is not negligible. Normally, the cooling water temperature is set at 20, but due to regional climatic conditions. The conditions of water supply facilities and the temperature of plant are different, so the quality defects of ingots are found in regional or seasonal ingots. Modern mold water supply system with pulse or cross disguised form function, are determined by the process of programming, so the cooling intensity can be set according to the casting technique for the curve, especially for some bad cold plastic and aluminum carbide, precision casting when cold crack and thermal cracking is almost at the same time, additional water retaining plate system, make the ingot surface temperature to the plastic tensile deformation temperature, eliminate cold cracks ingot casting, craft to take measures to prevent the hot crack, which can obtain high quality ingot.

 

Cooling intensity is also known as cooling speed. The cooling strength not only influences the crack of precision casting, but also influences the structure of the ingot, and increases the crystallization speed of the ingot as the cooling intensity increases. As the cooling intensity increases, the ingots are shallow. The bridge is shrunk in size. The metal shrinkage condition is improved, and the defects such as loose and porosity are eliminated or eliminated. Increase of ingot density: the size of a compound can be refined and the degree of regional segregation can be reduced.

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November 14, 2017

How to make cemented carbide tools more excellent

Carbide blades are composed of metal alloy powder, with more than 100 tons of press molding, and then through high temperature sintering. This is common with our top stone after long-term exposure, exposed to wind and rain, a large stone into numerous small stones and loose "weathered" process, so the alloy blade is very fragile, but also because of this principle.

 

To meet the requirements of a specific application, this product design not just adjust the number of cooling holes on blade. HPG provides a new groove, cemented carbide material - high wear resistant KCP15A material, this product is designed for steel material processing design. Compared with similar bit products, its latest design of self centering point angle and horizontal edge design can ensure the positioning accuracy and the hole verticality better, even in the case of high feed under. The slight chamfer fillet area of blade protection design, can reduce the edge chipping phenomenon, using the same design enhancement, HPG slot type products and therefore suitable for processing the hydraulic manifold application of common intersection and cable outlet, or processing heat exchanger in the production of stacked plates.

 

If the world only hole processing and application of steel materials, HPG groove blade should be sufficient to deal with, but the aerospace industry still needs processing of stainless steel and superalloy materials, automobile manufacturers of cast iron materials but also has a wide range of needs. For the former, the Kennametal Inc provides HPL slot type products, the design of split point of this product, can reduce the cutting force in the aerospace industry, medical equipment and materials processing alloy cutting long chips. And HPG is the same, this product also provides new materials, such as KCMS15, this is the fine grain cemented carbide material products a high abrasion resistance, corrosion resistant coating with AlTiN, can prolong the service life of the cutter. For cast iron, ductile iron and vermicular cast iron, four blade and round groove using HPC drill design, can avoid retracting common processing of these materials when chipping and cracking phenomena, the groove design of the special combination of rake face cooling hole design, the chip can be rapidly discharged.

 

All of these carbide blades adopt the drill point angle design of 143 degrees, through a special edge processing, polishing, or cutting edge rounding processing, ensure the optimization of tool life. The use of HPG, HPC, and HPL groove, KenTIP FS can be a variety of applications to meet the demand of the whole hard alloy drill processing, but its work unit cost is much lower, the performance is comparable or even better, Schmitt said.

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November 03, 2017

The technology of designing and making for tungsten steel cold extrusion dies

Tungsten steel cold extrusion dieis one of the fastener moulds, including processing technology "cold extrusion", is the metal blank in cold extrusion cavity, at room temperature, through the press fixed punch pressing blank to make metal blank parts made by plastic deformation processing approach.

Cold extrusion is at room temperature to plastic deformation of metal material, the unit extrusion pressure is quite big, at the same time due to the turbulent flow of metal materials produced by the thermal effect can make the mould work part temperature as high as 200 above, plus the severe wear and repeated actions of load, the mould are harsh working conditions.

Therefore, the cold extrusion dies of tungsten steel should have the following characteristics:

1. The mould should have sufficient strength and rigidity to work under the stress of cold and heat.

2. The parts of the mould shall have high strength, high hardness, high wear resistance, and certain toughness;

3. The geometrical shape of convex and concave modes should be reasonable, and the transition should be made to avoid stress concentration by using a large smooth circular arc.

4. Easy to replace the vulnerable parts of the die, and the interchangeability and universality of different extruded parts;

5. In order to improve the strength of the mould work, the concave mode is usually used in the prestressed combination of the concave mould.

In the guide pin, guide sleeve is tungsten steel mold standard parts, guide pin, guide sleeve is the main structure for different diameter of concentric cylindrical surface, the choice of material according to the requirements of the guide pillar structure size and material, directly select the appropriate size of hot rolled round steel as the blank material, after carburizing and quenching, in grinding.

The guide post of thetungsten steel mould is mounted on the mould seat. The guide sleeve is mounted on the upper module. The clearance between the guide column and the guide sleeve is smaller than that of the punch and the die.

The requirements of tungsten steel mould guide material:

Tungsten steel mold guide post heart requires good toughness, generally selects for 20 carbon steel material, blanking length should be considered when turning the clamping length, cylindrical stay 3-4 mm cutting allowance, after turning the external cylindrical grinding allowance should be 0.5 mm, permeable zone depth of 0.8 1.2 mm, surface hardness after quenching for 50 to 55 HRC, outer grinder or universal cylindrical grinding machine grinding, grinding should leave after grinding allowance of 0.01-0.01 mm, for the purpose of grinding process is to further improve the quality of roller surface, in order to eliminate the heat caused by neutral hole defects such as deformation on both ends of the guide post, guide pin hole in the center of the heat treatment should be revised, so that a clamping will guide post two cylindrical surface grinding out, to ensure the alignment of a cylinder.


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