Precautions for using carbide roller rings

Carbide roller rings are high-hardness, high-wear-resistant tool materials composed of tungsten carbide and bonding metal. In order to make carbide roller rings fully play their advantages of high wear resistance, long life and high efficiency in high-speed wire rolling, high-speed wire manufacturers should pay attention to the following matters when purchasing and using carbide roller rings:

1. Correctly select the carbide grade used in each finishing mill

Before selecting the carbide roller ring brand used in each frame, you should fully understand the performance of each brand of carbide to meet the needs of matching the brand of each frame.

2. Installation of carbide roller rings

The sleeve and installation of carbide roller rings are strictly carried out according to the accuracy required by the design process. The roller rings and the frame roller shaft and cone sleeves require appropriate matching and cannot be too tight or loose. Before installing the machine, check whether the roller rings meet the process requirements, and the assembly surfaces of the roller rings, cone sleeves and shafts must be carefully cleaned. It is strictly forbidden to hit the roller rings with hammers or other hard objects during assembly.

3. Requirements for cooling of roller rings and cooling water quality during rolling

When working, carbide roller rings are susceptible to thermal corrosion, thermal fatigue and thermal stress, and are prone to network thermal fatigue cracks. As the thermal cracks extend, they may cause block peeling and even broken rollers in severe cases. Cooling is to reduce the effects of thermal corrosion, thermal fatigue and thermal stress on carbide roller rings during roller ring rolling, prevent roller ring rupture, delay the spread of cracks, and extend the life of the groove. It is very important for the carbide roller ring to play its role. The reference specifications for cooling are as follows: the temperature of cooling water is lower than 35°C, and the pressure of cooling water

5 Grinding of groove

It is difficult to avoid microcracks in the groove of carbide roller rings during rolling. When the microcracks in the groove reach a certain depth (generally controlled at about 0.2mm) during rolling, they must be removed and ground in time. This is necessary to reduce and avoid the continued expansion of microcracks in the groove and cause broken rollers. When re-grinding the groove, it is important to completely grind away the micro cracks, otherwise the un-grinded micro cracks will bring great risk of roll breakage in the next rolling. It is difficult and inconvenient to use instruments to detect whether the micro cracks are completely ground away during grinding. In order to ensure that the micro cracks are completely ground away, a certain amount of grinding can be added. Under normal process rolling volume, grinding is generally controlled to:

Finishing mill (9-10) frame roller ring (0.4-0.6) mm

Finishing mill (1-8) frame roller ring (0.7-1.2) mm

Pre-finishing mill roller ring (1.2-2.0) mm