Drawing Process And Die On The Wire Mechanical Properties

The mechanics performance non-uniformity of the steel wire in the cold finishing is the universal existence question, it is also the important side for steel wire quality disparity between China and overseas. The influence of steel wire mechanics performance nonuniformity mainly has three factors: Wire rod quality uniformity, wire drawing technology and dies, heat treatment processing. All wire drawing technology conditions, like the reduction ratio, the nib work awl angle, the cooling lubrication, drawing speed, the lubricant and so on after the cold-drawing, to the effect of the steel wire mechanics performance, all may be included into "the quantity of heat" to the steel wire the influence. The steel wire in the drawing process , as a result of receives the distortion heat and the friction heat function but is heated up, when specially continuously drawing, by the while going along quantity of heat unceasing accumulation, may cause the steel wire to heat up to the quite high temperature, thus has the effectiveness for a period of time, remarkably affects the steel wiremechanics performance.This article mainly aims at the wire drawing technology and the dies carries on the discussion to the steel wire mechanics performance influence. In the key research, the high-carbon steel silk chooses the different mold parameter, the compression ratio, the cooling condition in drawing but creates the steel wire to give off heat, the mold and the reel radiation, the steel wire enters the mold and time the mold temperature change differently to its mechanics performance influence. Thus obtains: 1st, dies working cone angle then the steel wire draws more greatly time produces draws the strength also in a big way, the steel wire and the dies contact long goes past short, its distortion fiercer, when steel wire distortion in the unit time emits quantity of heat also more, finally causes the steel wire leaves when the mold the temperature high, creates the steel wire tensile strength, degree of hardness elevates but is curving, the reverse value reduces. 2nd, the die decides a diameter belt longer steel wire to draw the after elastic after smaller, it decides the diameter effect also well, but along with decides the diameter belt the growth steel wire and the mold friction increases, thus intensifies wears and creates draws the strength to increase, this time similarly causes steel wire temperature increment, creates the tensile strength and degree of hardness elevates, but is curving, the reverse value reduces. 3rd, center, high-carbon steel when cold-drawing the mold best work cone angle is 0.85d (d is steel wire diameter) decides diameter belt length 0.846 d time. 4th, when the center, the high-carbon steel, draws along with the steel wire temperature increment, the effectiveness for a period of time mechanism is sped up, its result is the steel wire plasticity reduces, the tensile strength elevates, the...