I. What is ZTF?

ZTF is a kind of forming technology developed by Zhongtai Company in 2005, which  absorbed advanced technology from both domestic and international, and then earn “Technology Innovation Award” by China Cold Forming Steel Association.
 
ZTF Characteristics:

1. Do not need to change moulds in breakdown section, saving about 60% cost on the rolls
2. Roll changing time is cut down greatly, breakdown section does not need to change moulds and just adjust is ok. And it can cut-down producing period.
3. Release labor intensity.
4. Roll forming technology, the caliber is different and propitious for X70,N80 steel strip.

5) The steel strip is distorted and beared more reasonably, to reduce the rub between the strip and roller, and also reduce the waste of the roller.
6)It is easier to restore and adjust roller.
 
II. Where is ZTF used?
 
ZTF technology is used in breakdown section and only suit to produce round pipes.
 
III. What is breakdown section and what is fin-pass section?

Normally, we part the mills as forming section and sizing section.
The section before guild-frame is forming and the rest part is sizing section.
For ZTF, we divide forming section into breakdown section and fin-pass section. The part after the unit of vertical rolls is fin-pass section and before is breakdown section.
 
VI. The development of ZTF technology
 
The Comparation Among Four Generations of Our Pipe Forming Technology
 
 “ZTF-1”, “ZTF-2” , “XZTF-3” and “XZTF-4”
  

Technology	ZTF-1	ZTF-2	XZTF-3	XZTF-4
Adjustment Method	Manual	Manual	Electric	Electric
Rolls in Breakdown section	Basically Common Use	Fully Common Use	Fully Common Use	Fully Common Use
Structure and Adjustment of Rotating Horizontal Rolls	No Horizontal Rolls	Manually adjust the rotating, opening & closing and lifting of upper rolls, the lower rolls opening& closing on the shaft. Manually adjust quick release or adjustable mats.	Electric adjust the rotating, opening & closing and lifting of upper rolls , tilting lower rolls opeing& closing on the roll seats. Electric adjust the the space between rolls which is controlled by screw.	Electric adjust the rotating, opening & closing and lifting of upper rolls.  Computer adjust the tilting of the lower rolls opening& closing on the roll seats, the space between rolls which is controlled by screw
Structure and Adjustment of Swiveling Vertical Rolls	Manually control the adjustment for the opening & closeing, lifting and rotating of the special curve rolls.	Manually or electromotion control the adjustment for the opening & closing, lifting and rotating of the special curve rolls.	Electric control the adjustment for the opening & closeing, lifting and rotating of the special curve rolls.	Computer control the adjustment for the opening & closeing, lifting and rotating of the special curve rolls.
Adjustment of Other Rolls in Roughly Forming Section	Rollers shall be replaced when producing new size of pipe.	The rolls open and close on the shaft, manually adjust the quick release and the adjustable mats, the lifting the upper rolls.	The rolls open and close on the shaft or roll seats, manually adjust the space between rolls which is controlled by screw, the lifting of the upper rolls.	The rolls open and close on the shaft or roll seat. Electric adjust the space between rolls which is  controlled by screw. Computer adjust the lifting of the upper rolls.
Micro-adjustment Device for Side Vertical Rolls in Final Forming and Sizing Section	N/A	N/A	Yes	Yes
Adjustment for Rolls Position	Manual	Manual	Manual	Computer
Request for Electronic Control	Low	Low	High	Higher
Accuracy of Rolls Position Adjustment	High	High	Higher	Highest
Operation Site of Rolls position Adjustment	Inside the stands	Inside the stands	Outside the stands	Outside the stands
Deformation of the Pipe Blank Edge	Good	Good	Better	Better
The Formation for High Rrecision, High Steel Grade and Thick Wall Pipe	Good	Better	Best	Best
Accuracy of Pipe	High	High	Higher	Higher
Labour Intensity	High	High	Low	Very low
Time for Replacing Rolls	Long	Short	Short	Shortest
Online Adjustment	Normal	Normal	Good	Good

  

Model	Round pipe mm	Square pipe mm	Thickness mm	Working spead m/min
ERW114	Ф48-Ф114	40x40-90x90	1.5-4.5	65
ERW140	Ф60-Ф140	50x50-110x110	2.0-5.0	60
ERW165	Ф76-Ф165	60x60-130x130	2.0-6.0	50
ERW219	Ф89-Ф219	70x70-170x170	2.0-8.0	50
ERW273	Ф114-Ф273	90x90-210x210	3.0-10.0	45
ERW325	Ф140-Ф325	110x110-250x250	4.0-12.7	40
ERW377	Ф165-Ф377	130x130-280x280	4.0-14.0	35
ERW406	Ф219-Ф406	170x170-330x330	6.0-16.0	30
ERW508	Ф273-Ф508	210x210-400x400	6.0-18.0	25
ERW660	Ф325-Ф660	250x250-500x500	6.0-20.0	20
ERW720	Ф355-Ф720	300x300-600x600	6.0-22.0	20