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Tube Mill Production Line

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The tube & pipe mill machine is an automation system to produce pipes, square tubes, shaped tubes

Tube mill Process description:

Rolling and welding
Firstly, the stainless steel strips are made to gone through various quality checks and are trimmed at edges. The strips pass through the number of rollers as per the required size. In the tubes mill, the strip is gradually converted into the tubular shape. The fitted welding machine is then used to weld trim edges of the strip welding process. In this way, rolled pipes and tubes are formed.

The cleaning and heating phase
The rolled stainless steel pipes thus manufactured are cut to the required lengths depending upon the industrial demand. These stainless pipes and tubes are then subjected to cleaning to remove the dirt. Further, a heat treatment is given to these rolled pipes and tubes to remove the stresses that may occur due to welding and formation processes. Heat treatment is given on the continuously rolling hearth furnace. The furnace is fitted with temperature recorders and controllers. After the heat treatment process, the stainless steel tubes and pipes are straightened and subjected to pickling for removing scales from the surface.

Cold- drawing process
In some cases, the required size may not be obtained from the mill directly. Then, the cold operation process can be used to obtain the desired size. In cold drawing process, the tubes or pipes are coated with oxalic and soap solution. This solution acts as a lubricant to reduce friction while cold drawing operation.

Finishing process
The drawn-out tube or stainless steel pipe is then subjected to cleaning, heat treatment, pickling and straightening. The computerized ink jet marking machine is used to do the marking on the finished pipes or tubes. 

Tube mills and pipe mills serve an array of industries and applications, including:

  • Electrical conduitGas transmission
  • Liquid transportation
  • Oil and gas drilling
  • Irrigation
  • Structural tubing
  • Petrochemical pipe
  • Medical
  • Hydroform tubing
  • Mechanical tubing
  • Exhaust pipe

 

Tube Mill Line

 

Applicable specification 

  1. Hot or cold-rolled low-carbon steel(As per GB700-88 or 1591-88)
  2. Material: low-carbon steel, low alloy steel strip(δs ≤ 980MPa, δb ≤ 345MPa)
  3. Thickness of strip: 0.9-4.0mm
  4. Width of strip: 65-200mm
  5. I.D. of coil: Φ508-610mm
  6. O.D. of coil: Φ1000-1600mm
  7. Max. coil weight: ≤5000kg

 

Product process flow

Raw material→ uncoiling → shearing and butt-welding → horizontal →leveling→ mill-forming →high-frequency welding → deburring → cooling(water colling) → sizing →straightening → fixed length cutting → run-out table

Tube Mill Line

 

Main equipment details

SN.

Name

Technical parameters and introductions

Quantity

Remark model, source,place of origin

Tube Mill Line

1

Hydraumatic type single head uncoiler

Thickness of strip: 0.9-4.0mm

Width of strip: 65-200mm

I.D. of coil: Φ508-610mm

O.D. of coil: Φ1000-1600mm

Coil weight:≤5000kg

 

1

self-produce

2

Shear & butt-welder

Shearing 2 coil strips tidily and then welding together and leveling weld seam.

1

          

3

Horizontal loop accumulator

Its main function is to store a certain amount of steel strip for supplying main machine before it doing head and end welding to make sure main machine’s continuous production without stopping

(1) Horizontal diameter: 4.5m

(2) Strip width:65-200mm

(3) Strip thickness: 0.9-4.0mm

(4) Feeding speed: 120-200m

Structure: Bogie frame, pinch device(18.5KW AC motor) Horizontal(30KW AC motor)

1

 

 

 

 

 

Tube Mill Line

Feeding device

One set of 7 passive leveling rollers,

Side guide: 1 pair

1 set

self-produce

Forming device

 

Tube O.D.:Φ21-Φ63,

wall thickness:0.9-4.0

Horizontal roll stand: 7

Vertical roll stand:10groups

The bottom diameter of forming roller: 150mm

Arrangement: Feeding-1 Horizontal-1 Vertical-2、 Horizontal-2 Vertical-3、 Horizontal-3Vertical-4 、Horizontal-4 Vertical5 Vertical6、 Vertical-7 Horizontal-5 Vertical-8、 Horizontal-6 Vertical-9、 Horizontal-7 Vertical-10

1 set

Horizontal roll shaft diameterΦ80heat treatment: HB250-280, Material 42CrMo, Bearing:Harbin; Vertical roll shaft diameterΦ45, Material45#hammer ,Bearing: Harbin

 

Tube Mill Line

Guiding device

guide roll stand for controlling weld seam direction

1set

     self-produce

welding device

 3 rolls squeezing

 

1set

self-produce

Cooling Device

Water cooling

1 set

self-produce

Sizing section

Tube O.D.:Φ21-Φ63,

wall thickness:0.9-4.0

Horizontal roll stand: 6groups

Vertical roll stand:6 groups.

Arrangement:Vertical-1 Horizontal-1 、Vertical-2 Horizontal-2、

Vertical-3 Horizontal-3、Vertical-4 Horizontal-4、Vertical-5 Horizontal-5、Vertical-6  Horizontal-6

1 set

Horizontal roll shaft diameterΦ80heat treatment: HB250-280, Material 42CrMo, Bearing:Harbin; Vertical roll shaft diameterΦ45, Material45#hammer ,Bearing: Harbin

 

 

Straightener

Turk’s head type(4 rolls)

2 sets

self-produce

Material :42CrMo

 

deburring device

domestic

1 set

self-produce

 

Transmission system

The unit adopts the forming machine and sizing machine combined transmitting, the main motor through reducer, gear box (spiral bevel gear drive 20CrMoTi carburizing and quenching), universal drive shaft drag the horizontal roller; Vertical roll for non powered roller.

DC Motor:  160KW Low   speed   1Set

Main reducer:ZLY250   4-output shafts        1Set

 

 

 

 

 

1set

 

 

 

 

 

 

 

 

Coolant circulation system

Forming machine, cooling water tank, sizing unit in each main pipeline are respectively connected with master valve (ball valve).

The forming, sizing roll group with an adjustable plastic cooling pipe supply coolant, control valves coolant flow through the plastic cooling pipe control

 

1set

 

Tube Mill Line

5

Computer-controlled cutting saw

Structure: fixed length computer-controlled cutting

Usage:(1)Determine the location of the pipe fixed-length, rapid start-up the cut-off equipment and the line speed synchronous

(2)Maintain cutting device synchronized with the line speed, Cut off the body moves and cut off the steel pipe

(3)Rapid reduction

Control method: AC

Drive:Computer-controlled AC motor through reduction gearbox transmission pinion and rack drive to the saw car

Cutting way:Friction heat of metal cutting

Sawing clamping device: The former saw a group of block clamping

The maximum running speed of the vehicle:70 m/min

Cutting diameter:φ21~φ63mm

Cutting tube wall thickness:≤4.0mm

Cutting speed:Max12/min         Cutting tolerance:≤2mm

Fixed length:4~6m

The specification of the saw blade:φ650×80×4

Cutting motor:30KW

 tracking motor:22KW

1set

 

 

6

Run out table

 runout table

1

self-produce

Tube Mill Line

7

High frequency welder DC Drive Cabinet

GGP250-.0.35-H

250KWsolid statehigh frequency welder, Rectifier cabinet, Inverter cabinet, transformer, worktop, wind and water cooling system

1 set

 

 

 

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