LD-20 3-high pipe cold rolling mill is improved developed from the LD8-15II pipe cold rolling mill which is designed by original Xi’an Heavy Industries Institute, based on the produce practice and the load evaluation in our factory, according to the application situation and suggestions of users.
Rolling principle of this machine is described briefly as: 3 roller, which is at the angle of 120° with each other on the cross section in rolling direction, roll reciprocally along the sliding tables of 3 working faces those are of certain curve shapes. By doing this, the rolling grooves will be changed and it could finish rolling the pipe billet between the pushing head and the roller. The billet is charged further by the interval turning feed which synchronizes with the reciprocal movement. After all of these finish, a complete rolling course finishes.
Finished pipes rolled by this machine are of high precision, nice surface quality and improved mechanical performances. They are fit for being produced into various steel pipes, non-ferrous pipes and alloy pipes with high precision, high strength and thin pipe wall, including briefly 20, 45, 30CrMnSiA, 1Cr18Ni9Ti etc.

SN	Name	Quantity	Unit	Remarks
1	Outside diameter of pipe billet	Φ9-φ22	mm
2	Wall thickness of pipe billet	＜1.8	mm
3	Max. length of pipe billet	4	m
4	Min. length of pipe billet	2	m
5	Outside diameter of finished pipe	Φ8-φ20	mm
6	Wall thickness of finished pipe	0.2-1.5	mm
7	Length of finished pipe	≤8	m
8	Elongation coefficient	﹤2.5
9	Mechanical performance of the pipe rolled	δb=120	Kg/mm2

SN	Name	Quantity	Unit
1	Roller quantity	3
2	Stroke length of the trolley of rolling mill	415	mm
3	Stroke times of the trolley of rolling mill	65-100	次/分
4	Stroke times for the rolling mill trolley to start rolling	25	次/分
5	Feeding quantity of pipe billets	1.65;2.08;2.88;4.07; 5.15;7.1	mm
6	Turning angle of pipe billet	52	度
7	Quick return velocity of pipe billet the round metal plate on the top	8.6	m/min
8	Length of connecting rod	1300	mm
9	Eccentric diameter of the eccentric gear	203	mm
10	Distance between rolling center line and eccentric gear center line	275	mm

SN	Parameter	Quantity	Unit
1	Main transmit motor Model Z2-71 Power 17KW Rotate speed n=1500	1	台 r/min
2	Quick return motor of pipe billet the round metal plate on the top Model Y112M-6 Power N=2.2KW Rotate speed n=940	1	台 r/min