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  • Name: Drilling bar rolling mill

Rock drilling rod production line
Steel quality required

It is knew that after researchers long years have been studied the result achieved, in failure analysis drilling rod and whole drilling rod, the steel quality is main reason to effect to drilling rod service life after its geometry parameter reasonable, steel, and production process so the steel quality standard must up to level range.

1)Keep chemical proportion range in steel within <0.015% ( general process elements caused fluctuation <0.05%),,P≤0.014%S≤0.009%

2)Hardness difference caused from control steel elements fluctuation and chemical proportion aliquation ≤2HRc (harden ability characteristic range in general process is about 8-10)

3)Keep oxygen content in steel ≤0.0012% ( Oxygen content of general electric arc furnace steel ≤0.004%)

4)Keep D sorts of substance ≤8μm ( in general process they are 40~50μm, specially up to 100μm);

5)Keep steel crystal grain fineness up to 8 class more ( in general process is 4~5 class);

 

This process achieved on a basic after we analysis of serious production process in domestic and abroad. Its feature:

   (1)To increase the ratio of rolling reduction and good mechanical property of hollow bar, prefer select big diameter billet.

(2)Perfect use big diameter billet to elongate finished hollow drilling rod length and get rate of finish products more;

(3)In this rolling mill, it can roll small sized hollow drilling rods and also can roll heavy one, and can roll heavy thickness pipe, width products range;

(4)Pilling billets, removed billet rolling defect and up drilling rod surface quality more;

(5)With 6 roll rolling forming technique, to make hexangular hollow bar generated compression stress and up products fatigue capability on drilling bar surface;

(6)Compare with drawing process, to adopted 6 roll forming technique, up rate of finish product effectually and reduce production cost;

(7)Compare with other process, it is less investment and lower production cost to guarantee product quality;

Rock drilling rod use hollow steel (GB/T1301-2008)

Graph 1

 

 

Sizes

Across flats distance/mm

Core Dia./mm

mm

Degree of eccentricity

r

Theory weight

kg/m

Basic sizes

H(D)

Circumcircle Dia.

Allowed declination

Basic size

Allowed decination

I

class

II

class

I

class

II

class

I

class

II

class

H19

19.0

21.94

+0.2

-0.2

+0.3

-0.3

6.0

+0.4

-0.4

+0.8

-1.0

0.5

0.8

2.5

2.21

H22

22.2

25.63

+0.2

-0.2

+0.3

-0.4

6.7

+0.4

-0.6

+0.8

-1.2

0.6

0.9

3.0

3.05

H25

25.3

29.21

+0.3

-0.2

+0.6

-0.3

7.6

+0.5

-0.5

+0.9

-1.1

0.7

1.2

3.0

3.97

H28

28.6

33.02

+0.3

-0.2

+0.7

-0.3

8.8

+0.5

-0.6

+0.9

-1.2

0.8

1.3

3.5

5.05

H32

32.0

36.95

+0.4

-0.2

+0.9

-0.3

9.5

+0.6

-0.6

+0.8

-1.2

0.9

1.4

4.0

6.36

H35

35.3

40.76

+0.3

-0.3

+0.8

-0.4

9.5

+0.6

-0.6

+1.3

-0.7

1.0

1.8

4.5

7.86

Graph 2 Round (R) hollow steel

R32

32.2

 

+0.3

-0.3

+0.8

-0.4

9.2

+0.5

-0.5

+0.8

-1.2

0.7

1.4

5.83

R39-

39.0

 

+0.3

-0.3

+1.0

-0.4

13.0

+0.8

-0.8

+1.6

-1.6

1.0

1.7

8.27

R39

39.0

 

+0.3

-0.3

+1.0

-0.4

14.5

+0.8

-0.8

+1.6

-1.6

1.0

1.7

8.02

R46-

45.8

 

+0.4

-0.4

+1.2

-0.6

15.0

+0.9

-0.9

+1.9

-1.9

1.2

1.9

11.46

R46

45.8

 

+0.4

-0.4

+1.2

-0.6

17.0

+0.9

-0.9

+1.9

-1.9

1.2

1.9

11.07

R52-

52.0

 

+0.5

-0.5

+1.5

-0.7

19.0

+1.0

-1.0

+2.0

-2.0

1.4

2.0

14.35

R52

52.0

 

+0.5

-0.5

+1.5

-0.7

21.5

+1.0

-1.0

+2.0

-2.0

1.4

2.0

13.72

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This production line output is about 10000Tons annual

 

Production process:

Billets cutting by saw machineBillets peelingSlop furnaceNatural gasΦ70 Piercing millΦ70 Rolling with mandrel bar on OD70 tube rolling mill OD 70 tube rolling millR32~52 Hollow bar/ H19~35 Hollow bar6 Roll rolling millCut to lengthCooling bedCollection deviceforhollow drill bar finish products

 

Table 2.  Main equipment for producing New type drill bar

                  

No.

Equipment name

Parameter

QTY

Power

Remarks

kw

1

Band saw machine

Φ60~95mm

1

2.5

Purchased

2

Pilling machine

Φ60~95mm

1

15

3

Heating furnace

1.8 T/h

1

 

 

4

70 piercing mill

Φ95

1

550

 

5

3 Roll Assel mill

Φ95

1

215

 

6

3 Roll sizing mill

Φ75

1

215

 

7

6 Roll rolling mill

H35

1

55

 

8

Disc rotary cutting machine

Φ22~55

2

3.6

Purchased

9

Cooling bed

7×5 m

1

10

 

10

Tables and Conveyer,

 

1

 

 

11

Lubrication station

 

1

 

 

12

Electric control system

 

1

 

 

13

Cooling pump station

15T/h

1

2

 

14

Compressor

3 m3/min

1

18.5

Purchased

15

Lifting equipment

2T

1

 

 

Total

 

 

1086.6

 

 
 

Note:

1.In this list, 6 roll mill is no need for round drilling bar production;

2.The power is Max. roughly calculated;

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