Wiredrawing mold's each kind of material quality has the characteristic respectively. And, the rough diamond wiredrawing mold's price is most expensive, the processing extremely is also difficult, simultaneously because of rough diamond's aeolotropy, degree of hardness difference is very big in the radial direction scope, has the fierce attrition easily in some direction, therefore the rough diamond mold is only suitable for the processing diameter very small silk material. Hard alloy mold degree of hardness is low, draws the wire rod quality with the hard alloy mold to be high, the surface roughness is low, but the hard alloy mold's resistance to wear is bad, mold's service life is short. Crystal combination diamond mold's degree of hardness is only inferior to the rough diamond, because it has the isotropic characteristic, will not have the phenomenon which the sole gauge wear will intensify, but its price will be very expensive, the refractory, the production cost will be very high. The CVD coating wiredrawing mold because of has the diamond performance to have the good resistance to wear, draws the wire rod surface roughness to be low, but the CVD coating wiredrawing mold's production process is complex, the refractory, the cost is high; After coating abrasion, the mold will wear rapidly, not only guarantees the processing quality with difficulty, moreover cannot duplicate uses, can only discard. The ceramic material has compared to the hard alloy high degree of hardness and the resistance to wear, the manufacture cost is inexpensive, is situated between the diamond and the hard alloy manufacture wiredrawing mold's fine material. But because ceramic material's toughness is bad, the thermal shock is bad, and the refractory, not yet obtains the wide range application until now. Each kind of wiredrawing mold material quality's good and bad points contrast see Table 2.
2 several kind of wiredrawing mold material good and bad points contrast
pulls out the mold material quality - merit - shortcoming - application scope
governs the heron zhi # manufacture simple - resistance to wear to be bad, life short - basic elimination
yang calls the heron account - degree of hardness high, wear-resisting performance good - brittleness to be big, processes the difficult - diameter 1.2mm following line mold
The warehouse excrement governs se the polishability to be good, the energy consumption low - resistance to wear is bad, refractory - each kind of diameter wire rod
Diligent artificial diamond - degree of hardness is high, resistance to wear good - refractory, cost high - small wire rod, silk material
the CVD coating material - smooth finish is high, the heat resistance good - craft is complex, refractory - small wire rod, silk material
moistens checks the herd to hope wear-resisting, thermostable, the corrosion-resisting good - thermal shock, toughness bad, to process difficultly - not to have the wide range application
tows attentively bu copie.The ridge male pulls out in harmonious the processing, the rough diamond, the crystal combination diamond and the CVD coating mold are the commonly used wiredrawing mold materials. When draws the minor diameter silk material, the CVD coating diamond mold has overcome the rough diamond mold's aeolotropy, simultaneously has the fine intensity and degree of hardness, the drawing output is highest, the surface quality also meets the requirements. The experiment proved that the CVD coating diamond wiredrawing mold's life equates in the rough diamond mold, the product qualified rate is high, the surface quality surpasses the domestically produced crystal combination diamond. Therefore, draws the processing regarding the minor diameter silk material, the CVD coating diamond wiredrawing mold is a more ideal choice.
the luxuriant silk mold may use in processing each kind of metals and the alloy material and so on steel and iron, copper, tungsten, molybdenum, but the different material quality's wiredrawing mold has its suitable working range respectively, when different material quality wiredrawing mold processing same wire rod its attrition shape and service life existence very wide difference, therefore selects the wiredrawing mold material quality is reasonably guarantees the successful application the key. The different material quality's wiredrawing mold has it relatively reasonable processing object. Draws the processing rationality mainly to refer to the wiredrawing mold and wire rod both's mechanics, physics and the chemical properties matches mutually, obtains the longest mold service life. For example, when draws the same diameter copper wire, the crystal combination diamond mold's service life is hard alloy mold life 300~500 times, draws when the nickel silk is only 80~100 times, when draws the molybdenum silk, its life only then hard alloy mold life 50~80 times, but draws time the carbon steel, crystal combination diamond mold's life only then hard alloy mold's 20~60 times. Because the home to draws the mold and the wire rod match theory lacks the system research, has caused the blind choice, creates the resources waste. The wiredrawing mold's friction attrition situation is very complex, generally divides into the destruction and the friction wears two broad headings. The wiredrawing mold's destruction may divide into the ring-like destruction, the tension failure, the shearing failure and the bearing surface destruction and so on, the friction wears may divide into the abrasion to wear, the friction to wear the attrition which, the corrosive wear, the abrasion and the fine-grain produce and so on. Working condition (wire rod material, wiredrawing mold material quality, lubricant and so on) the difference, causes the wiredrawing mold's attrition and the destruction has its unique process. Between the wiredrawing mold's wear-out failure's reciprocity, in is essentially the incident cross-correlation. The wiredrawing mold internal situation is possibly subtle, some factors also will possibly have an effect, their superimposition function will be complex, will not be easy to understand. The possible factor's function to be able to cover other factors the function, the above several kind of destructions and the friction wear the form possibly frequently interweaves in the same place, increased the difficulty for the analysis wiredrawing mold's destruction abrasion mechanism. But generally speaking, each kind of material quality wiredrawing mold's wear resistant sorting from high to low is: The diamond wiredrawing mold (had not considered rough diamond aeolotropic question) - - the ceramic wiredrawing mold - - hard alloy mold - - has eliminated alloy steel die.
To the wiredrawing mold's material quality's research, the wiredrawing mold is turning toward, the high degree of hardness, the high wear resistant development high strength, each kind conforms to the request new material to emerge one after another incessantly, the wiredrawing mold's wear resistant large scale enhancement, wears, the destruction time to retard obviously, the wiredrawing mold life increases unceasingly, the working accuracy also had certain enhancement. Draws the processing applicable scope gradual growth, from thick ones to thin ones each kind of specification's wire rod may process, and appeared has used in processing the anomalous wire rod the different mold.
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