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Q1: While fine-grain Tungsten Carbide parts are used in wire electric discharge machining, chipping is occurred frequently.
A: Please try our A10W grade for resist EDM. It keeps the performance of fine grain grade KD20, the heat crack-resistant at the time of electric discharge machining is improved as well.
Q2: Although Tungsten Carbide parts are used for press processing of stainless steel material, their wear-resistance is inferior to that of SPCC material.
A: Stainless steel material is hard and tough, so wear and chipping arise early. We recommend you to use our KD grade which has excellent toughness and wear-resistance.
Q3: Although we want to use a tap to fix Tungsten Carbide parts, there is no space to be brazed, and joint intensity is required, too.
A: We recommend you a direct tap machining. Before sintering, contraction is estimated and tap machining is performed. Our direct tap machining makes them stronger than electric discharge tapping and brazing.
Q4: The wear of Die and Punch arise early in high speed press. We want to extend the life one cycle more.
A: We recommend you a lapping of cutting edge. By making the surface smooth, sliding friction is reduced and wear-resistance is improved. We guarantee the surface roughness less than 0.3S keeping the size accuracy by grinding on grinding stone even if it has variant shape.
Q5: Can we fix Tungsten Carbide parts with magnetic chuck while machining?
A: Though Tungsten Carbide is a magnetic body, magnet fixation is dangerous because of its weakness of the magnetism. Please fix it with vise, bond adhesion or some tool.
Q6: We want use Tungsten Carbide for hot working.
A: Tungsten Carbide, generally, does not have hardness change at the temperature under 600 ℃. However, degradation of its quality is caused under long-term high temperature. We recommend you our corrosion-resistant KN grade for small load rolling.
Q7: The life of Tungsten Carbide parts is extremely short at the time of machining of pure iron, pure copper and nickel, etc.
A: It is caused by the affinity with the cobalt contained in the Tungsten Carbide. We have developed MC grade which has low affinity with the work materials. It has received favorable remarks from many customers.
Q8: Which Tungsten Carbide grade has the most excellent wear-resistance?
A: We have SS grade for abrasive wear-resistance. SS13's hardness is HV2200 and SS15's is HV2450. However, since their toughness is very low, we recommend you small load use.
Q9: We wish short time for delivery.
A: We stock each grade of Tungsten Carbide in various sizes of block. We also have stocks which have already ground two-face, four-face and six face so that they can be immediately used by cutting. We are always ready for sintering law material as well.
Q10: We heard that micro-grain Tungsten Carbide needs a long delivery time.
A: It is not true with us. Our delivery time is the same with other grade by our constant manufacturing of micro-grain grade EF20.
Q11: Although we want to use Tungsten Carbide instead of die steel, high speed tool steel or sintered metal high speed steel, we are afraid of high cost.
A: We, basically, estimate the price of Tungsten Carbide by weight. As finished parts are usually not so heavy, most of the price elements arise by their machining, such as EDM, lapping and polishing etc. Therefore, there is no big difference in the price. We could see that Tungsten Carbide's machining is easier than that of steel because thin steel parts bend easily during its machining.
Q12: How can we storage Tungsten Carbide parts?
A: Tungsten Carbide may be corroded with grinding liquid and lubricant under machining and with humidity as well. If a polished side and a lapped side have a bad storage state, Tungsten Carbide is corroded in a few days and its strength is decreased. Please protect it with rust prevention oil or rust prevention paper.

 

 
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