It is important to analyze the causes of cracks in the tungsten carbide roll ring and take effective measures to control and prevent it.
What Are The Reasons For The Cracks Of The Tungsten Carbide Roll Rings?
Tungsten carbide roll rings are often used in high-speed wire rolling mills. In the rolling production, cracks are often found in the holes and grooves of the roll ring. It is easy to cause carbide roll rings cracked , which directly affects the quality and progress of the carbide roll ring processing and the quality of the finished product. Therefore, it is important to analyze the causes of cracks in the tungsten carbide roll ring and take effective measures to control and prevent it.
What are the reasons for the cracks of the tungsten carbide roll rings?
So how to take effective control measures? To control the expansion of hot cracks, it is necessary to process and repair the tungsten carbide roll ring before it cracks. At the same time, the amount of steel passing through a single groove must be controlled.
Tungsten carbide roll rings form hot cracks during hot rolling, and the propagation of hot cracks not only depends on the cooling effect, but also depends on the rolled material. Rolling and corrosion can cause surface defects of the holes and grooves, which can cause premature fracture of the roll ring, and thermal cracks can also accelerate the defects on the surface of the roll ring.
If the roller is not replaced in time, the micro-cracks will extend to widen and deepen the micro-cracks, or a tortoise crack will appear. In severe cases, the roll ring may burst or break.
During the rolling process, the hot-rolled piece contacts the surface of the rolling groove, which causes the surface temperature of the roll ring to rise. This part of the metal will expand, and the metal temperature in the deep layer of the roll ring will have a small temperature rise due to the small temperature increase on the surface of the roll ring. The metal produces compressive stress; on the contrary, when the surface of the roll ring is quenched by cooling water, the surface metal shrinks, and the deep metal shrinks less than the surface metal, which will generate a tensile stress on the surface metal, so that repeated alternating thermal stress is very easy to generate heat Fatigue cracks cause micro cracks at the bottom of the roll ring groove.
Tungsten carbide roller rings have good wear resistance, high temperature red hardness, heat fatigue resistance and thermal conductivity, and high strength. It is a key component of high-speed wire rolling production. Tungsten carbide roll rings are mainly used in the pre-finishing, finishing, and reducing sizing units of high-speed wire rod mills to reduce the area of the rolled pieces and improve the material properties of the rolled pieces. Tungsten carbide roll ring is a tool material with high strength and high wear resistance composed of hard tungsten carbide particles and metal binder. Sometimes some nickel, chromium, etc. are added to the binder phase to obtain corresponding performance.
The micro cracks on the roll ring should be repaired in time and thoroughly worn out. In addition, a reasonable rolling amount is also the basis for determining the amount of roll ring grinding. The micro-cracks produced during the rolling process of the groove of the roll ring will expand and deepen over time. In short, hot cracks of cemented carbide rolls are inevitable, but they can be reground in time; according to the use of different mills to roll rings of different specifications and different materials, determine the amount of steel passing through a single groove; the amount of processing must be specified for the roll ring; the establishment of strict The processing and inspection and acceptance system are adopted to control the occurrence of cracks and repair them in time.
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