SU835538A1 - Tube longitudinal rolling stand - Google Patents

Description

The invention relates to the field of metal forming and can be used in the longitudinal rolling of pipes on reduction, continuous mandrel and automatic mills. 5

Known mill cage for pipe reduction, containing two driven stream rolls and two non-driven, forming a round gauge [1].

The disadvantage of such stands is a significant transverse deformation of the pipe.

The closest known to the declared one is a stand for longitudinal rolling of tubes, and containing two drive brook rolls and two guiding Internet tools in the form of rulers, the shape of which corresponds to the profile of the stream, located diametrically and closing the gap between the rolls [2].

Installed in the non-focal zone and 20 designed to limit non-contact deformation and increase the stability of the transverse profile of the pipes during hot and cold reduction, the rulers cannot eliminate the local transverse deformation of the pipe through the roll connector, which reduces the accuracy of the geometric dimensions of the finished pipes.

The aim of the invention is to improve the accuracy of the geometric dimensions of the pipes. thirty

This goal is achieved by creating a stand for longitudinal rolling of pipes, including two drive brook rolls and two guide tools located diametrically and closing the gap between the rolls, in which, according to the invention, the guide tool is made in the form of high-strength elastic continuous tapes forming their profile rollers and wires, located in front of and behind the rolls.

Such a guide tool reduces non-contact lateral deformation, reduces lateral difference and allows to increase the pulling ability of the rolls.

In FIG. 1 shows a diagram of a mill; in FIG. 2 is a cross-sectional view of FIG. 1.

The cage for longitudinal rolling of pipes contains two drive brook rolls 1, two guide tools in the form of continuous tapes 2, forming their profile rollers 3 and wires 4. The shape of the tape in the deformation zone is defined by the forming profile rollers, and the pulling rollers 5 move the tape. Nozzles 6 are provided for cooling and lubricating the belt. The tape in cross section has a variable thickness and forms a closed caliber together with the rolls. Kri835538 the visna of the stream brook is adjusted in accordance with the profile of the tape.

The crate works as follows.

Rolling of the pipe is carried out in a closed gauge formed by rolls 1 and tape 2. The pipe during rolling passes through the rolls together with the tape, which is preformed by forming rollers 3, is guided by wires 4 located at the input and output of the rolls. The tape is moved by rollers 5. In the process of moving it can be cooled and lubricated, for which nozzles are provided 6. Using the pulling rollers you can adjust the speed of movement of the tape. If the speed of the tape at the inlet is higher than the speed of the front end of the pipe, the conditions for gripping the pipe with rolls are improved.

The proposed stand design allows the rolling process to be carried out in a closed gauge, which contributes to an increase in one-time deformations in one stand to

........

30-40% and reduces the lateral difference of the pipe.

Claims (1)

Claim 5 A cage for longitudinal rolling of pipes, including two drive brook rolls and two guide tools located diametrically and closing the gap between the rolls, characterized in that, in order to increase the accuracy of the geometric dimensions of the pipes, the guide tool is made in the form of high-strength elastic continuous tapes forming them profile rollers and wiring, 5 located in front of and behind the rolls.