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Technical support
Maintenance
    After rolling one short period,the hardness of rolling surface arise 3-4 HRC and strain hardening layer producing causes fatigue effect,which brings crack and spalling.The only way to decrease the possibilities of crack and spalling,elongate the roll¡¯s life is to remove the phase-transformation layer in advance.
    According to our statistics,the following data will help you to maintenmance your roll to keep good condition:

A.Relation between the depth of cut and cracks possibility

Roll Description

Depth of grinding(mm/dia)

Possibility of crack

1st Intermediate Roll

0.1

2%

0.25

1%

2nd Intermediate Roll

0.1

2%

0.25

1%

B.The grinding Date of Roll

Material

 

Rough Grinding

Finish Grinding

 

Grinding wheel

CBN

GC

M1.

Grain Size&Grade

#170.75

220j8B

M2.

Infeed

0.02 mm/pass

0.005-0.01 mm/pass

M7.

Wheel Speed

1800 m/min

1800 m/min

M42

Roll Speed

64-100 rpm

64-100 rpm

C.Standard Grinding Depth

Type

Depth of grinding(mm/dia)

Per Operation period

D2 Work roll

0.03-0.05

1coil

M2 Work roll

0.01-0.02

1coil

1st Intermediate Roll

0.1-0.25

72hrs

2nd Intermediate Roll

0.1-0.3

144hrs

    D.instruction of Crack and Spill
    1.Evan rolling compression higher,the cracks may not be found,however the micro structure could be transmuted.The phase-transformation layer should be removed,otherwise the phase-transmutation will result in cracks in the future.
2.When crack and spill happened,it¡¯s important to promptly cut this layer;otherwise rolls will be damaged in the early stage.Prolong the use of roll is to inspect in the primary.
    3.Prolonged use and not following the recommendation for depth of cut for grinding request,the fatigued layer will accumulate on the surface of roller and spill and crack on the surface layer could be happen.
General Maintenance Report
Roll Type: Roll No: Diameter:
Roll Material: Arrival Date: Hardness:


No.

Operation Period

Work
Hours

Total Work
Hours

Rolling
Quantity
(MT)

Total Rolling
Quantity
(MT)

Dia
(mm)

Depth
Of Cut

Hardness

Rolling
Accident

Remark

1

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

7

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

 

 

 

 

 

9

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

11

 

 

 

 

 

 

 

 

 

 

12

 

 

 

 

 

 

 

 

 

 

 

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China Plant£ºIndustrial district C,Guanlin Town,Yixing City,Jiangsu Province,CHINA  Contact person: Luo Ruiqun  Email: 183266249@qq.com  Wechat: luoruiqun
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