1.Requirement for the cooling of roll rings and cooling water during the course of rolling
Because of the negative effect of heat corrosion, thermal fatigue and thermal stress, the net-shaped thermal fatigue crack usually appears while collar working. With the increase of cracks ,small parts may come off an even the roll rings is broken.
We adopt the cooling method to reduce the bad effect ,prevent the cracks from stretching and prolong the durability of rolling groove, which plays an positive role on the cemented carbide roll rings.
The parameters of cooling water are as follows : temperature no more than 35 ℃, pressure of 0.4-0.6 Mpa, volume of 24-30 m³ per stand per hour ,radical direction fro spraying water, the angle of 15-30°between the spraying direction and rotating direction of roll rings. The water is twice as wide as the rolling groove and directly sprayed into the groove without scattering.
2.Water quality requirement :
For YGH series medium or weak alkali water of PH＞ 7.2
For YGR series or PH＜7.2 weak acid water of PH ＞ 7.2
The content of solid particles in the water ＜15 milligram/L