| High strength conveyor belt with steel wire is mainly used for rubber skeleton’s reinforced material, including wires in the process of rubber vulcanization, by the work of vulcanization process of temperature and time, leading to the function of strength degradation of heat aging phenomenon, which affects the performance of the conveyor belt. So this paper studies the high strength conveyor belt with steel wire rope thermal aging behavior and influence factors, through mechanics performance test and wire tensile elastic strain hardening model, analyzes the thermal aging temperature and time and drawing should be variables on the wire the influence law of thermal aging behavior, probes into the mechanism of heat aging behavior, compared the two materials anti-aging ability.The test of different heating temperature of thermal aging showed that different temperature range of cold drawn steel wire heating aging behavior shows different characteristics. It is mainly based on strain aging under 250 ℃ while it displays obcious response to soften above 250℃. Tensile strain hardening model of cold drawn steel wire was built based on modified Ludwik model before and after thermal aging. It can use the model parameters of strain hardening coefficient K and strain hardening index n to quantitatively describe the themal aging conditions on the tensile properties of cold drawn steel wire before and after thermal aging changes.The influence of temperature is the most obvious on the steel wire heat aging behavior, strength and hardness of the steel wire before 150 ℃ temperature thermal aging than aging has increased significantly, torsions and elongation at break reduces significantly. At 250℃ strength gets down slightly after 350℃ thermal aging, a marked decline in strength, but elongation at break rises obviously. Strain hardening index below 250℃ temperature of the steel wire after heat aging can also keep the high level, the un iform plastic deformation ability is very good, and also keeps the high level work hardening coefficient. After thermal aging at 350℃ and above temperature, strain hardening index is very low, the uniform plastic deformation ability is very poor. At 150℃ and 250℃ heat aging temperature, heating time effect on the properties of steel wire in strain aging or reply to soften to the sensitivity of the dynamic process of time difference, the result shows strain aging faster and reply to softening slower. A ging time on the properties of steel wire is embodied in 20 minutes to reach peak strain aging, strength increases obviously, the elongation at break and torsions decrease obviously. Strain hardening index changing with the aging time was in a small range of fluctuations(between 0.50- 0.80). With the extension of thermal aging time, the aging reinforcement effect is not going to disappear. With the increase of strain capacity, the strength of steel wire is on the rise when thermal aging before the strain hardening and strain aging after thermal aging. While wire plastic decreases. But in high temperature thermal aging reply softening reduces significantly while wire plastic improves. Raw material types on the cold drawn steel wire also has effect on the thermal aging behavior. Compared with two kinds of steel, steel 82 B is stronger than steel 80# in anti-aging ability. |
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