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TUBING MILL MANUFACTURING PLANT

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Allstate's Of America, Inc. 2595 N.W 37TH. ST. MIAMI, FLORIDA, 33142 USA 800 223 2573, 305 635-4525 Fax 305 635-5353 e-mail Bob@allstates.com http://www.allstates.com

Specification of Standard Tube Mill
Modle	Tube O.D (mm)	Wall Thickness (mm)
WNT-50A	Ø25.4 ~ Ø63.5	1.2 ~ 4.5
WNT-70A	Ø31.8 ~ Ø76.3	1.4 ~ 6.0
WNT-100A	Ø34.0 ~ Ø114.3	2.3 ~ 7.1
WNT-130A	Ø42.7 ~ Ø139.8	2.3 ~ 8.1

DOUBLE DRUMS AND SWIVEL UNCOILER

Function:

• Uncoiler takes the strip from overhead crane and unwinds to feed the coil into the line.

Specification:


Feed speed into the looper
Max. strip weight
Strip width
ID of strip

Operation:

• A coil is mounted on an expansible drum using an overhead crane while the other one is in operation. When the working strip is unwound off from the drum, operator turns the uncoiler upper frame so that new coil can be fed into the line.

Construction:

• Lower frame made of heavy-duty welded steel supporting swivel double drum upper frame.

• Slewing upper frame is driven by hydraulic motor.

• Slow start and stop motion are made by hydraulically operated brake valve mounted

under solenoid during slewing motion.

• 2 hydraulically expansible and collapsible link type drum made of cast iron.

• Disk brake operated by air-oil converter enables the strip to be fed with appropriate back-tension.

• Heavy-duty slewing bearing equipped with spur gear on outside ensures smooth movement

of turning.

• Cu SHEAR AND WELDER cuts the wrong part of leading and trailing end of the strip and welds both ends for

continuous operation of tube mill.

Newly developed STRIP-END WELDER is a new generation of welder

for joining strip-end to strip-end and has following characteristics.

1. Quick and correct cutting by pneumatic cylinder

2. Automatic TIG welding ensures stable and relatively little bead of welded part

3. Very easy operation

4. Very economical for investment and operation

COMPOSITION

1. Movable 4-wheeled cart

2. Pneumatically operated shear

3. TIG welder

4. Variable speed drive for welding torch

5. Pneumatically operated clamping device

ROTARY LOOPER

Function:

• Stores the strip to ensure continuous operation of the tube mill.

Specification:

Model No.

Strip thickness

Strip width

Incoming speed

Outlet speed of strip

Storage capacity

Entry pinch drive

Rotary drum drive

Dimension (Approx.)

Operation:

• This equipment is used for accumulating the strip to be fed into the line without stopping

the line during butt welding of both ends of the strip.

• The strip will be accumulated on stationary inner drum and outer drum of the

ROTARY LOOPER by means of rotation of the rotary drum. The rotary drum is driven

and controlled by AC servomotor. And the AC servomotor also is simultaneously controlled

by entry pinch roll and exit guide roll speed.

• Required length data of the strip for accumulating to be used during welding time is stored

in electronic controller by operator, and target sensor, which is mounted on the outer basket,

detects the number of wound turns and sends its feed back signal to the controller.

If required length is accumulated as directed, the controller automatically stops rotation

of the rotary drum.

• If more strips to be accumulated are needed compared with the stored length data,

which is determined by operator and stored in the controller, the rotary drum rotates fast till

the strip is accumulated full. When the wound strip is too tight or too loose,

another sensor detects the tightness of wound strip coil and controls it to be wound

appropriately.

• The rotation speed of the rotary drum is also controlled according to the mill speed.

This mill speed is detected by an encoder mounted on exit guide roll.

• The stored strip is then fed into the mill through spiral drum, on which a number of cylindrical

guide rolls are mounted for the strip support.

Construction:

• One (1) robust main frame made of welded steel

• One (1) inlet pinch roll driven by variable speed DC motor and guide rolls

• One (1) rotary drum mounted in anti-friction bearings and driven by AC servomotor

• One (1) outer basket composed of vertically mounted cylindrical rolls

• One (1) inner basket composed of vertically mounted cylindrical rolls

• A number of side guide rolls controlled by an AC geared motor

• One (1) outlet horizontal deflector roll and measuring rolls

• Three (3) optical sensors for detecting winding turns, coiled strip tightness and home position

of the rotary drum

• Two (2) rotary encoders to detect required strip length and accumulation speed

FORMING SECTION This section is composed of:

Guide roll ----------------------------------- 1 set

Side guide rolls & leveler -------------- 2 sets

Forming vertical stands ---------------- 4 sets

Forming side roll stands -------------- 3 sets

Clustered side roll stands ------------ 2 sets

Fin-pass vertical stands --------------- 3 sets

Fin-pass side roll stands -------------- 2 sets

Driving gear box -------------------------- 7 sets

GUIDE ROLL

Function: • Guides the strip incoming from the accumulator to the tube pass level.

Specification:


Roll size

Construction: • Two (2) horizontal steel rolls are supported by anti-friction bearings mounted on a support frame.

• This guide roll unit is mounted on the entrance side of main bed.

SIDE GUIDE ROLL & LEVELER

Function: • Adjusts the centerline of the strip by means of hand-wheels and screws.

• Flattens the strip to facilitate forming.

Specification:

Side guide

Type

Roll materialAlloy tool steel (SKD - 11)No of RollsFour (4)LevelerType3-Roll typeDriveIdleRoll materialAlloy steelRoll arrangementTop - 1, Bottom - 2

Construction: • Side Guide Rolls

- The side guide rolls are provided at the entry side of forming section.

2 Roll chocks move horizontally or centrically in a box type housing by

a manually operated wheel and a threaded shaft, which has right and left-hand thread on it.

- Each roll has grooved home which exactly guides and shaves sharp edges of the slit strip.

These rolls are made of hardened alloy tool steel to prevent from rapid weariness.

• Leveler

- The leveler facilitates the strip entering and forming at the first stage of breakdown part.

Composition

1 Heavy-duty welded steel frame

3 Hardened and ground alloy steel rolls

1 Height adjustment screws mounted in upper roll housing

BREAKDOWN VERTICAL STANDS

Function: • Forms the strip into tubular shape progressively.

Specification:


Roll shaft diameter
Roll root diameter
Roll shaft material
Roll Adjustment
Roll shaft bearing
Inboard stand
Outboard stand
Stand material
Drive
Drive connection

Operation: • The strip passes between the upper and bottom roll of each stand, all these rolls

are driven by DC motor. When changing the rolls, the operator unscrews the nuts engaged

on the threaded end of roll shafts and pulls the outboard stand out.

Construction: • Four (4) stands are provided. All stands are all identical which are made of cast iron.

Each stand is composed of inboard and outboard housing. Outboard housing is moved off from

the shafts to facilitate roll changeover.

• Rolls are mounted on the top and bottom shafts, which are driven by DC motor through

universal joints and gearboxes, and are positioned at the right center by the spacers.

• In the cap of the stand, a set of manually operated single point screw jack is provided to move

the upper roll for height adjustment.

• Heavy-duty taper roller bearings mounted in inboard stand carry the shafts and roller

bearings rotating in hardened sleeves are mounted in outboard stand.

• In front side of each stand, precisely graduated scale is provided for operator's convenience.

FIN-PASS VERTICAL STANDS

Function: • Finally forms the strip into open-seam round tube and keep it in upright position.

Specification:


Roll shaft diameter
Roll root diameter
Roll shaft material
Roll Adjustment
Roll shaft bearing
Inboard stand
Outboard stand
Stand material
Drive connection

Construction: • The same as forming stands but fins are provided between 2 pieces of the upper rolls to

guide the open seam to center position and three (3) stands are provided.

FIN-PASS SIDE ROLL STANDS

Function: • The side rolls in both sides hold the strip tightly to maintain the formed

shape and prevent the spring back of the edges of coil.

Specification:


Roll shaft diameter
Roll shaft material
Side roll bearing

Construction: • The side roll stands of fin-pass part are the same as them of breakdown part.

DRIVING GEAR BOX

Specification: • Type Worm & helical gear type

• Worm material Alumi-bronze (AlBC2)

• Coupling Chain coupling type

• Lubrication Forced circulation

• Oil cooling By heat-exchanger with water

WELDING SECTION Welding section is composed of;

Seam guide --------------------------------------- 1 set

High frequency welder ------------------------- 1 set

Squeeze roll -------------------------------------- 1 set

Bead scarf unit & bead winder --------------- -- 1 set

Ironing roll stand --------------------------------- 1 set

CT stand ------------------------------------------- 1 set

Water cooling --------------------------------- 1 set

0x08 graphic

SEAM GUIDE

Function: • Finally centers and maintains required gap of both edges of the strip just before welding.

Specification:


Up-down moving range
Feed-back moving range
Angle of seam moving

Construction: • The main housing of the seam guide made from welded steel is mounted on the main bed.

• 2 Intermediated plates are mounted on the main housing and are adjusted in line flow

and perpendicular directions respectively. The roll holders provided on upper and lower side of

the tube adjust the open seam by means of worm and worm wheel, which is machined on

the circumference of the roll holder. The upper roll is provided with fin for guiding the seam and

the lower roll without fin supports the bottom side of the tube.

• Each roll is mounted in a chock respectively, which is moved in vertically machined roll holder.

The seam guide main housing is adjusted in both directions of the pipe flow, forward

and backward, thus enable to adjust exact gap for welding.

HIGH FREQUENCY WELDER ( Out of scope of supply)

SQUEEZE ROLL

Function: • Squeezes precisely both edges of the strip which have been heated by the welder.

Specification:


Type	3-Roll type
Roll arrangement
Top	2 Roll
Side	1 Rolls

Construction: • Both edges of the strip completely formed in tubular shape is squeezed precisely and laterally by 3 guide rolls.

• Three (3) guide rolls are mounted on the specially made lathe chuck type holder,

of which 3 slides are simultaneously operated with single point mechanism.

• This lathe chuck type squeeze roll holder slides vertically in the welded steel structure frame for pass-line adjustment.

• Because of one (1) holder comprising all 3 rolls with heavy-duty roll brackets,

roll shafts would not to be bent passively caused by spring back of the strip.

BEAD SCARFING UNIT AND BEAD WINDER

Function: • Removes outside bead of the tube and winds it on a rotating drum.

Specification: • No of tool holders Two (2)

• Quick lifting By pneumatic cylinders,

Construction: • Bead scarf unit

Two (2) tool holders are mounted on a frame, and are operated and adjusted separately.

Each outside bead scarf unit consists of tool holder, sliding plate and a frame made

of welded steel. The tool holder is vertically and horizontally adjusted by manually operated threaded shafts.

Quick lifting devices of the tool holder actuated by air cylinder are provided for emergency.

• Bead winder

Bead scrap is wound on a rotating drum, which is collapsible by air cylinder.

The rotating drum is driven by an AC geared motor through worm gearbox and friction pad.

By this friction pad, excessive rotating force can be reduced.

IRONING ROLL STAND

Function: • Thickens the welded seam of tube outside after the bead is removed.

Specification:


Roll shaft diameter
Roll root diameter
Roll shaft material
Roll Adjustment
Roll shaft bearing
Inboard stand
Outboard stand
Stand material
Drive

Construction: • The function and construction are the same as the forming stands. 2 roll shafts are all idle.

C.T STAND (Out of scope of supply)

WATER COOLING

Function: • Cools down the temperature of the tube heated by the welder while it passes trough the water shower bath.

Specification: • Length 5,000 mm

Construction: • The water cooling includes welded steel tank and perforated pipe which supply the water shower.

• Idle rollers adjustable are provided in the tank to support the tube processed.

SIZING SECTION This section is composed of;

Sizing 2-roll vertical stands --------------- 2 sets

Sizing side stands -------------------------- 2 sets

Sizing 4-roll vertical stands ---------------- 3 sets

Turks head stands ------------------------- 1 set

Measuring roll ------------------------------- 1 set

Driving gear boxes --------------------------- 5 sets

SIZING 2-ROLL VERTICAL STANDS