Cold rolling machine is a process equipment for cold rolling of steel tubes using ring hole shape. The machine has good performance in opening the billet, and also can roll seamless non-ferrous metal tubes of ordinary precision. The most important feature of the cold rolling mill is the high material utilization rate, and the accuracy and surface roughness are better than the cold drawn pipe.

 

Cold rolling machine are generally divided into two types, one is the LG type, one is the LD type.L cold rolling mill.G type of cold rolling mill for two-roller mill.LD type for multi-roller mill (at least three rolls above, including three).LG type cold rolling mill main structure: bed, rotary feeding mechanism, frame, main motor, mandrel, transmission system, electrical system, etc.. This first put forward the rotary feeding mechanism, the previous cold rolling mill are single rotary single feeding, with the development of science and technology, now developed for single rotary, double feeding, double rotary, single feeding. Double rotary double feeding, etc., the general feeding method can be divided into mechanical feeding, photoelectric feeding, servo feeding, etc. The most important part of a cold rolling mill is the frame, the frame includes: rolls, gears, rack, etc.. Its working principle: rolls and mandrels form a regular cavity, using the elastic deformation of the metal to achieve the rolling of steel.

 

Working Principle

The cold rolling machine uses an electric motor to drag the steel bar, and uses the load-bearing rolls and working rolls of the cold rolling mill to jointly apply force to the two faces of the bar. By changing the size of the gap between the two rolls to achieve the purpose of rolling out different diameters of cold-rolled ribbed steel bars.

1 Load-bearing roll: The load-bearing roll of the cold rolling mill is the one closest to the machine base, which plays the role of holding up the reinforcing bar and distributing the gravity of the bar and the gravity of the working roll evenly on the load-bearing roll, thus making the rib pattern on the lower surface of the bar.

2 work roll: The work roll of the cold rolling mill is on top of the load-bearing roll, which is the farthest from the machine base, so this roll mainly plays the role of rolling the steel bar held up by the load-bearing roll when producing ribbed steel bars, thus making the rib pattern on the upper surface of the steel bar.

 

Structure and application of multi-roller cold rolling mill:

Multi-roller cold rolling machine circumferential direction uniformly arranged with equal cross-sectional circular hole type of 3 to 5 rolls random head reciprocating movement, and along the slide curve together or open, so that the multi-roller cold rolling mill with the hole type in the middle of the fixed cylindrical mandrel of the gross tube for periodic rolling section by section of the cold rolling mill.

Multi-roller cold rolling machine elastic flattening, in the same unit pressure, and multi-roller cold rolling mill diameter is proportional, when the multi-roller cold rolling mill material is certain, to reduce the elastic flattening value of the roll, you must reduce the roll diameter. In order to economically feasible rolling thin strip, must use the smallest possible diameter work roll.