By the drive of the gear set above the drive shaft of t […]
By the drive of the gear set above the drive shaft of the DC motor, the movement of the two universal joints connected to the gear set drives the pair of rolls connected to the universal joint, thereby achieving The purpose of rolling. The surface phenomenon of the rolling mill principle is very simple. A cable or copper conductor having a large outer diameter is passed through a pair of rotating rolls, and the pressure is reduced by the compression of the rolls, and the length is increased. At present, the 4.524.5 mm semi-product cable is directly rolled into the data specified in the process parameters. At present, the largest roll of the rolling mill can be rolled with a ¢32 mm cable, and the ¢32 mm cable can be directly rolled to ¢5.15 mm. The control system of the rolling mill is relatively complicated. It is divided into three parts: mechanical, hydraulic and electrical control. The accuracy of the rolling mill is related to the level of mechanical manufacturing. Hydraulic and electrical control are also necessary.
Rolling mill equipment construction mills mainly have working stands and transmissions. The working machine base is composed of a roll, a roll bearing, a frame, a rail seat, a roll adjusting device and the like. A roll is a component that plastically deforms a metal.
Work machine seat:
1) The roll bearing supports the roll and maintains the fixed position of the roll in the frame.
2) Mill rail seat: used to install the rack and fixed on the foundation, also known as the foot board. It withstands the gravity and tipping moment of the working machine seat while ensuring the accuracy of the mounting dimensions of the working machine base.
3) Roll adjustment device: At present, the roll gap of the 14-stand mill of Boler, Germany does not need to be adjusted. The roll is automatically replaced according to the preset parameters of the main console. It takes only about 2 minutes to change the roll. The replacement of the rolls by the KANTHAL 7- and 12-stand mills in the UK is very cumbersome. It is necessary to adjust the roll gap of the replacement rolls. It takes several hours to replace the rolls normally.
Transmission: It consists of DC motor, universal joint, gear seat and connecting shaft. The gear carrier distributes the drive torque to the two rolls.
The principle of drawing: a metal blank that passes through the drawing die hole is clamped by the jaw of the drawing machine, and is pulled out from the die hole to obtain a processing method of the product having the same cross-sectional shape and size. Unlike the extrusion and rolling processes, the drawing process is carried out by applying a pulling force to the front end of the metal to be processed, which is the pulling force. The ratio of the pulling force to the cross-sectional area at the die-out of the drawn metal is called the unit drawing force, that is, the drawing stress. In fact, the drawing stress is the longitudinal stress at the end of the deformation zone, and the drawing stress should be less than the yield strength of the metal exit die. If the drawing stress is too large than the yield strength of the metal die, the neck of the product may be caused to be broken or even broken. Therefore, the drawing stress is smaller than the deformation pulling force after the metal die exit.