Cemented Carbide Composite Roll Ring Replaces Cast Iron Roll
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Cemented Carbide Composite Roll Ring Replaces Cast Iron Roll
From the structure of carbide rolls, there are two types: solid cemented carbide rolls and composite cemented carbide rolls. Among them, the solid carbide rolls have been widely used in the pre-finishing and finishing stands of high-speed wire rod mills (including reducing sizing stands and pinch roll stands).
The composite cemented carbide roll is composed of cemented carbide and other materials, and can be divided into cemented carbide composite roll ring and solid cemented carbide composite roll. The cemented carbide composite roll ring is installed on the roll shaft by mechanical connection, and is used in small rolling mills, high-speed wire rolling mills, steel pipe three-high rolling mills, etc.: solid cemented carbide and composite rolls cast cemented carbide roll rings directly into the roll shaft Formed as a whole, it is used in rolling mills with very heavy rolling load.
Application of Cemented Carbide Roll in High-speed Wire Production
Cemented carbide roll rings are widely used in high-speed wire rolling mills. In the high-speed wire rod rolling mill, the rolling force, rolling torque and wear of the roll rings on different stands are different, and different cemented carbide grades must be used accordingly. Under normal circumstances, the rolling load of the preceding stands (such as the intermediate rolling and pre-finishing stands) is relatively large. The roll ring is required to have good toughness and strength, and a grade with a higher binder phase content must be selected; and the subsequent racks (such as the finishing rolling rack, the reducing sizing rack RSM, the dual-module TMB rack) have a long time to pass through the steel. The roll ring has better wear resistance, so choose a grade with low binder content: especially the finished product and the front frame of the finished product. The roll ring has a direct impact on the surface quality and tolerance of the finished wire rod. Compared with the previous frames , It is more necessary to change rolls and grooves frequently. Usually, the number of changes is 2-4 times that of the previous stands. Its wear resistance often plays a decisive role in improving the efficiency of the entire rolling mill.
The cemented carbide composite roll ring is used in the middle rolling stand of the high-speed wire rolling mill to replace the traditional cast iron rolls, which greatly increases the trough life of the middle rolling stand by 10-20 times, and greatly reduces the downtime of the high-speed wire rolling mill. , While improving the utilization rate of the rolling mill, the working condition of the cemented carbide roll ring in the subsequent stage is greatly improved, the service life of the cemented carbide roll ring is extended, and the final product quality of the wire rod is improved.
Application of cemented carbide composite roll ring on small rolling mill
The cemented carbide composite roll ring is used in the finishing and intermediate rolling stands of small rolling mills. It is generally used in 2-10 stands abroad, and at least two stands, namely the finished product and the front stand of the finished product, can be used at the same time. The best performance and benefits of the rolling mill are conducive to ensuring good working conditions of the composite roll ring of the finished stand, and improving the single groove rolling life and the quality of the rolled material.
The groove life of cemented carbide composite roll rings is about 10-20 times that of ordinary cast iron rolls, and the grinding amount is only 1/2 to 1/3 of that of cast iron rolls. Therefore, compared with traditional cast iron rolls, composite rolls The total rolling volume of the ring is 20-40 times that of ordinary rolls.
The application range of cemented carbide composite roll rings is very wide. The production of wire, bar, pipe and other small materials, such as square steel, hexagonal steel, flat steel, angle steel, etc. can be applied to this technology, which will greatly improve the performance of the rolling mill. Good results have been received. For example, when rolling 12ram rebar, the single groove rolling volume of the cemented carbide composite roll ring is more than 1300 tons, which is 16 times more than the single groove rolling volume of ordinary cast iron rolls of 80 tons; The grinding amount is 1.5-2.0mm, which is 1/2-1/3 of the cast iron roll 5-6ram. When rolling 20*3 spring flat steel, the single groove rolling volume of the composite roll ring is more than 1,000 tons, while the cast iron roll is 70-90 tons, a difference of more than 10 times.
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