High Speed Wire Finishing mill

It is over-hang type(cantilever type) twist-free mill,cross top 45°configuration, it has three series: ten stands series, 8 stands series, and 6 stands series.

(1) ten stands series:

the mill has ten stands, it has fiveφ230 stands and fiveφ170 stands, or, it can be 10 φ230 stands. The driving is made collectively.

Function: The finishing mill group is located behind the 3# flying shear area while in front of water cooling device. Its function is that through the continuous milling of 10 mill stands with micro tension, the φ17～23mm work pieces conveyed by the upstream finishing mill is milled into the φ5.5～13mm finished wire. The finishing mill group assures the outlet velocity of 90m/s.

The finishing mill group consists of 10 finishing mills, in which there are 5 φ230 and 5 φ170 finishing mills. The last two φ170 finishing mills are with super high-speed stands. The layout of the ten mill stands is 45°top crossing. The main feature of structure is as following:

Features：

Structure of rolling mill group:the finishing block has ten stands, fiveφ230 stands, and five φ170 stands. The last two stands of φ170 is ultra-high speed stands. These ten stands are configured in top cross 45° ,it has following features:

— The finishing mill group consists of 10 finishing mills, in which there are 5 φ230 and 5 φ170 finishing mills. The strength of the group gets obviously enhanced.

— The last two φ170 finishing mills are with super high-speed stands which increased the speed of the group and assure the outlet velocity of 90m/s.

— The layout adopted on the finishing mill group is 45°top crossing which reduces the height of the long shaft. Not only the stability of the finishing mill group is increased, but also the weight is reduced. In addition, it is more convenient to operate and maintain.

— Each pair of adjacent mill stands make 90° angle which helps realizing the non-twist milling.

— Plug-in and cantilever roll collared structure is adopted on the roll case. Eccentric sleeve system is equipped inside the case body to adjust the roll seam. The eccentric sleeve is equipped with film lubrication bearing and roll shaft. The roll collar is fixed by the conical sleeve at the end of roll shaft of cantilever.

— Tapered gearbox consists of the case body, transmission shaft, spiral bevel mated gear, synchronized mated gear. All the gears are hard tooth flank grinding gears with tooth flank correction and level 5-accuracy which assure high-speed stable operation.

— The roll case is connected with the tapered gearbox by bolts directly. The case body of the roll case is extended into the tapered gearbox during assembly to make its roll shaft gear respectively go into mesh with the two synchronized gears inside the tapered gearbox. The roll case and tapered gearbox are positioned by two location pins. The same size of roll cases can be interconverted.

— Rotate a guide screw with L.H&R.H handed thread buckle and nut to regulate the roll seam. Make two groups of eccentric sleeve rotate relatively, roll seam is changed through symmetrical movement of the distance between two roll shafts as the eccentric relative pass line of the eccentric sleeve and original position of pass line and guide are maintained.

Main Technical parameters

A． parameters

Size of incoming material: φ17～23mm

Temperature of incoming material: ﹥900°

Size of finished part: φ5.5～13mm

Type of milled steel: carbon steel, dilute-alloy steel, electrode steel

Outlet velocity of No. 10 stand: 90m/s

B．Performance of equipment：

Mode of finishing mill: cantilever roll collared finishing mill

Quantity of mill stands: 10 (No.1-5: Æ230 finishing mill, No.6-10: Æ170 finishing mill)

Form of layout: 45°top crossing, centralized drive for 10 mill stands.

Dimension of roll collar: Æ230 finishing mill: Æ228.3/Æ205×72mm

Æ170 finishing mill: Æ170.66/Æ153×57.35/70mm

Force of milling: Æ230 finishing mill: 270kN

Æ170 finishing mill: 150kN

Moment of milling: Æ230 finishing mill: 5.03 kNm

Æ170 finishing mill: 1.38 kNm

Driving dynamo: DC motor (buyer supply)

Power:1600kW

Rotation rate: 700-1200 r/min

Operation rotation rate: about 1000 r/min

Value of vibration: ≦4mm/s

Noise: ≦85dB (1.5m away from the finishing mill)

Noise: ≦85dB (1.5m away from the finishing mill)

See the table shown below for general velocity ratio (speed of dynamo/ rotation rate of roller installation):

Lubrication form of finishing mill group: thin oil centralized lubrication

Oil pressure: 0.6MPa

Total oil consumption: 1200 r/min

Type of oil: Mobil 525

Cleanliness: level 7

Hydraulic system of protective cover: operation pressure: 15MPa

System flow: 20 l/min

Operation pressure of roller installation: Max 49.5MPa

Operation pressure of roller unload: Max70 MPa

attachment：

Roller unload tool (φ230) 1 set

Roller installation tool (φ230) 1 set

Roller unload tool (φ170) 1 set

Roller installation tool (φ170) 1 set

(2) eight stands series:

The mill blocks has eight stands: it has threeφ230 stands, and five φ170 stands, or it can have eight φ230 stands,the driving is made collectively.

(3) six stands series:

The mill blocks has six stands, it has six φ230 stands,the driving is made collectively.

Function: Located in front of water cooling device. The workpieces conveyed by the upstream finishing mill is milled into the φ5.5～16mm finished wire through the continuous milling of 6 mill stands with micro tension. The finishing mill group assures the outlet velocity of 45m/s.

Construction of finishing mill block:

The finishing mill group consists of 6 finishing mills, in which there are 6 φ230 finishing mills. The layout of the six mill stands is 45°top crossing. The structure of the finishing mill group is characterized by:

—The finishing mill group consists of 6-Æ230 finishing mills. The strength of the finishing mill group is enhanced a lot.

—The last two φ230 finishing mills are with super high-speed stands which increased the speed of the group and assure the outlet velocity of 90m/s.

—The layout adopted on the finishing mill group is 45°top crossing which reduces the height of the long shaft. Not only the stability of the finishing mill group is increased, but also the weight is reduced. In addition, it is more convenient to operate and maintain.

—Each pair of adjacent mill stands make 90° angle which helps realizing the non-twist milling.

—Plug-in and cantilever roll collared structure is adopted on the roll case.

—Eccentric sleeve system is equipped inside the case body to adjust the roll seam. The eccentric sleeve is equipped with film lubrication bearing and roll shaft. The roll collar is fixed by the conical sleeve at the end of roll shaft of cantilever.

—Tapered gearbox consists of the case body, transmission shaft, spiral bevel mated gear, synchronized mated gear. All the gears are hard tooth flank grinding gears with tooth flank correction which assure high-speed stable operation.

—The roll case is connected with the tapered gearbox by bolts directly. The case body of the roll case is extended into the tapered gearbox during assembly to make its roll shaft gear respectively go into mesh with the two synchronized gears inside the tapered gearbox. The roll case and tapered gearbox are positioned by two location pins. The same size of roll cases can be interconverted.

—Rotate a guide screw with L.H&R.H handed thread buckle and nut to regulate the roll seam. Make two groups of eccentric sleeve rotate relatively, roll seam is changed through symmetrical movement of the distance between two roll shafts as the eccentric relative pass line of the eccentric sleeve and original position of pass line and guide are maintained

The main gears are all hard tooth flank grinding gears with tooth flank correction and level 4-accuracy. The film bearings and antifriction bearings are special bearings used on finishing mill stands Chinese made.

The main performance parameter of finishing mill block

A. Technical parameters

Temperature of incoming material: ﹥900°

Size of finished part: φ5.5～16mm

Type of milled steel: carbon steel, dilute-alloy steel, electrode steel, spring steel, cold heading steel

Outlet velocity of No. 6 stand: 45m/s

B. Performance of equipment

Mode of finishing mill: cantilever roll collared finishing mill

Quantity of mill stands: 6 (No.1-6: Æ230 finishing mill)

Form of layout: 45°top crossing, centralized drive for 6 mill stands.

Dimension of roll collar: Æ230 finishing mill: Æ228.3/Æ205×72mm

Force of milling: Æ230 finishing mill: 240kN

Moment of milling: Æ230 finishing mill: 5.09 kNm

Power：Take the purchaser’s final technical designing as standard

Rotation rate：Take the purchaser’s final technical designing as standard

Value of vibration: ≦4mm/s

Noise: ≦85dB (1.0m away from the finishing mill)

See the table shown below for general velocity ratio (speed of dynamo/ rotation rate of roller installation)

Acceleration box transmission ratio：High-speed shaft i =46/150

Low-speed shaft i=57/150

The final velocity ratio takes the purchaser’s final technical designing as standard

Lubrication form of finishing mill group: thin oil centralized lubrication

Oil pressure: 0.6MPa

Nominal flow-rate: 900 L/min

Type of oil: Mobil 525

NAS Cleaningness: level 7 (Fine filter core 10m)

Hydraulic system of protective cover: operation pressure: 15MPa

System flow: 20 l/min

Operation pressure of roller installation: Max 49.5MPa

Operation pressure of roller unload: Max70 MPa