UA65161A - Working stand for cold pilger rolling of pipes - Google Patents

Abstract

The working stand for cold Pilger rolling of pipes includes stationary power bed with guides fixed on its horizontal surfaces and rollers with bearing supports. The stand is equipped with roller bearings of linear displacement and with pillows, in which are located the bearing supports of rollers, and the roller bearings of linear displacement are mounted between each of said guides and pillow.

Description

The invention relates to pipe rolling production, namely to pipe rolling devices with a stationary bed and can be used for cold rolling of pipes on mandrels.

The known state of cold rolling of pipes with a stationary bed according to the author's certificate Me376136,

B21835/10, B21821/00, adopted as a prototype. It describes a device designed for rolling pipes.

The pipe-rolling device includes a stationary bed in which upper and lower rails connected by a traverse, pairs of rolls with streams of variable cross-section and two bilateral additional rails are installed. A bearing and a gear are installed on the necks of each of the rolls, each of which engages with a double-sided rail, in addition, the gears of the upper roll engage with the upper rails, and the gears of the lower roll - with the lower rails. At the same time, the upper and lower rails are connected to the crank-rocking mechanism, which provides them with horizontal reciprocating movement. The mentioned bearings rest on the guides installed on the horizontal surfaces of the bed.

The device works as follows. In the initial position, the pipe blank is inserted into the streams of alternating cross-section of the working rolls. The upper, lower and two-sided rails are set in motion by the movement of the crank mechanism, and the rollers engage with them to rotate around their axes, and at the same time, the bearings roll along the guides installed in the frame. By the end of the full rotation of the rolls, the section of the pipe blank is crimped, and at the end of the revolution, the pipe blank is rotated 90" and fed forward by a certain amount using the billet setting mechanism. After that, the rails and rolls are moved into the output As a result, a new section of the workpiece is placed between the rolls and it is pressed in the same way as described above.

It should be noted that during the reciprocating movement of the crank mechanism, the flanges of the bearing supports of the rolls, which are in contact with the bed guides, perceive significant loads arising from the vertical component of the metal pressure on the rollers, which causes wear of the flanges and guides, as a result of which they change working gaps between rolls. The uncontrollable nature of the change in the gaps between the rolls does not allow maintaining the required pipe sizes and leads to the need for frequent replacement of worn guides and flanges of the bearing supports of the rolls. To replace the bearing supports, it is necessary to roll out the cassette with rolls, disassemble the roller unit, press the bearing, and then again perform the operations of assembling and pressing the bearing supports, installing and securing the cassette in the cage. The execution of these operations requires considerable time spent during which the mill cage is idle, which negatively affects its productivity.

Thus, the disadvantage of the working cell of the mill of cold mill rolling of pipes is unsatisfactory performance.

The basis of the invention is the task of increasing the productivity of the working cage of a cold mill for pipe rolling. This task is solved at the expense of the technical result, which consists in reducing the idle time of the cage, associated with the change of its worn nodes.

In order to achieve the specified technical result, the working cell of the cold pilger pipe rolling mill, which includes a stationary power bed with guides fixed on its horizontal surfaces, rolls with bearing supports, according to the invention, is equipped with roller bearings of linear movement and cushions in which the bearing supports of the rolls are located , and roller bearings of linear movement are installed between each of the guides and the pillow.

As a result of a comparative analysis of the proposed solution and the prototype, it was established that they have the following common features: - stationary power bed; - guides installed on the horizontal surfaces of the bed; - rolls with bearing supports and distinguishing features: - cage equipment with roller bearings of linear movement; - cage equipment with pillows, in which there are roller bearings; - placement of bearings of linear movement between each of the guides installed on the horizontal surfaces of the bed and the pillow.

Thus, the proposed working cell of the cold mill pipe rolling mill has new structural elements, new connections and a new mutual arrangement of elements.

There is a cause-and-effect relationship between the set of distinctive features and the technical result achieved.

Thanks to the equipment of the working cell of the cold mill rolling mill with roller bearings of linear movement and cushions, in which the bearing supports of the rolls are located, as well as the placement of each roller bearing of linear movement between the guides of the bed and pillows, the operation of extracting and replacing the nodes that were worn out became less time-consuming and less time-consuming, because it is only necessary to unclip the linear roller bearings and remove them from the cage, this will take less time, which will reduce the duration of downtime and increase the productivity of the cage in the state of cold rolling.

The exclusion of at least one from the above set of distinguishing features does not ensure the achievement of a technical result.

The claimed technical solution is not known from the prior art, therefore it is new.

The proposed technical solution has an inventive level, because the design of the working cell of the state of cold pilfering pipe rolling, which is claimed, for specialists in the existing way, does not follow from the state of the art.

The claimed technical solution is industrially applied, because its technical and technological implementation does not present any difficulties.

With the use of this solution, a sketch project of the basic model of the working cage of the pipe rolling plant was completed.

Thus, the claimed solution can be given legal protection because it is new, inventive and industrially applied, that is, it meets all the criteria of an invention.

The invention is explained by the drawings, which show the following:

Fig. 1 - a general view of the cage of the state of cold pile rolling of pipes Fig. 2 - section A-A according to Fig. 1

The working cage of the cold pipe rolling mill (Figs. 1, 2) consists of a stationary power bed 1, consisting of a base 2 and a crossbar 3, fastened by four columns 4. A support plate 5 is located in the crossbar C. Between the support plate 5 and the crossbar Z there is wedge b pressure device. The support plate 5 is pressed against the crossbar with a balancing device 7, which consists of four pneumatic or hydraulic cylinders with springs. Guides 8 are attached to the base 2 and base plate 5, on which, through roller bearings of linear movement 9, roll pads 10 rest. In the roller pads, rolling bearings 11 are mounted working rolls 12, on the working surfaces of which streams of variable cross-section are made. Drive gears 13 are mounted on one of the necks of each working roll 12, which are engaged with toothed rails 14 installed in the grooves of the base 2 and traverse 3. The rails 14 have adjusting wedges 15, which allow changing the position of the rails 14 depending on the diameter of the drive gears 13 working rolls 12. Springs 16 are installed between the cushions of the upper and lower rolls 12, which accept the weight of the upper roll with pillows and gear. The roller cushions 10 are freely installed in the guides 8 of the roller cassette 17, which through the eyelets 18 are connected to the thrust of the crank-swing mechanism of the roller cassette 17 drive (not shown in the figure). The toothed racks 14 through the crossbar 19 and the eyelet 20 are connected to the drive, which provides the necessary amount of backlash of the driving gears 13 along the course of the rolls (not shown in the figure). Bearings 9 are attached to guides 8 using fasteners.

The working cell of the cold mill pipe rolling mill works as follows. In the initial position, the pipe blank is set in the streams of variable cross-section of the working rolls 12. The crank-rocking mechanism of the roll cassette drive through the eyelet 18 carries out reciprocating movement of the roll cassette 17, which moves together with the cushions 10, which rest on the guides 8 through roller bearings of linear movement 9. At the same time, as a result of the engagement of the roller gears 13 with the toothed rails 14, the working rollers 12 perform a counter-rotational movement around their axes in the bearings 11. By the end of the complete rotation of the rollers 12, the pipe section is pressed, and at the end of the rotation by the task mechanism, the pipe blank is turned by 90" and feed forward by some amount. After that, the rolls 12 are placed in the initial position by the movement of the roll cassette 17. As a result, a new section of the workpiece is placed between the rolls 12 and its crimping occurs in the same way as described above.

After performing a number of technological cycles of pipe rolling, there is a need to replace bearings of linear movement 9 due to uneven wear of their elements. For this, it will be necessary to stop the working cage, pour out the cassette 17, unfasten the fasteners that fix the roller bearings of linear movement 9 relative to the guides 8, remove the worn roller bearings and replace them with new roller bearings of linear movement 9, attaching them to the guides with fasteners 8, which will require significantly less time than in the prototype.

The execution of the working cage of the state of cold pilfer rolling in accordance with the claims of the invention, equipped with pillows in which the support rolls are located, and roller bearings of linear movement, installed between the guides and each of the pillows, simplifies and speeds up the process of replacing worn out roller bearing units, and this reduces simple cage, related to its repair, and increases the productivity of the working cage of the state of cold mill rolling of pipes.

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Claims (1)

The working cage of the mill of cold pilger rolling of pipes, which includes a stationary power bed with guides fixed on its horizontal surfaces and rolls with bearing supports, which is distinguished by the fact that it is equipped with roller bearings of linear movement and cushions in which the bearing supports of the rolls are located, and the roller bearings of linear movement are installed between each of the mentioned guides and the pillow.