RU2507015C1 - Method and device for pipe production by cold pilger rolling - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to pipe rolling. Pipe are made by cold Pilger rolling at rolling mill including rolling mandrel arranged at, at least one mandrel counter support. At least two deforming tools act on the pipe from outside. Measuring device defines pipe OD in deforming. To allow adjustment of position of at least one deforming tool on the basis of measurements made in deformation, at least one position control device is connected with at least one deforming tool acting on pipe from outside. Note here that said position control device is connected with measurement device.

EFFECT: higher quality of pipes.

20 cl, 14 dwg

Description

Technical field

The invention relates to a device and method for manufacturing pipes by cold pilger (cold pilgrim rolling) using a rolling mill, including a rolling mandrel located on at least one mandrel support, as well as at least two deforming tools acting on the pipe from the outside, preferably at least one outer roll, and a measuring device for determining the outer diameter of the pipe during the deformation process.

By cold pipe pilger is meant a method for further processing seamless pipes from the original format to the final format. The aim of the pilger is to reduce the outer diameter and wall thickness of seamless pipes. In this case, the source material, the so-called tube billet, is usually guided by a pair of rolls that have a conical calibration, and the said pair of rolls alternately rotates and feeds on the tube billet. Inside the tube billet is a mandrel for rolling.

Usually, this is the result of pipes with especially narrow tolerances in size. During production, size changes may be established on the product. If the diameter of the pipe threatens to leave the tolerance area or has already left it, then the rolling mill has so far stopped and the roll gap has been adjusted. Rapidly occurring dimensional changes during spot checks remain perhaps unknown. Also, confirmation of successful dimensional adjustment was possible only when at least the entire remaining pipe was deformed or the rolling mill was again stopped for dimensional control. Finally, with each size adjustment, production time was lost, as the rolling mill had to stop.

Optical methods are suitable for measuring the diameter of the finished pipe, such as using laser light arrays.

The use of non-destructive measurement methods for the cold pilger process of the prior art, however, is unknown. On the contrary, the measurement methods used so far follow, further, the principle that, after the deformation and sampling, the measurement should be taken and then, using experimental values, change individual or several deformation parameters and, finally, the result of this change of parameters in conclusion once again check after a further completed deformation process.

Object of the invention

The objective of the invention in accordance with this was to provide an automated manufacturing method and a suitable device for it, which are able to make it possible to adjust the positions of at least one deforming tool during cold pilger based on the measurement data obtained during the deformation process.

This problem in the context of the invention is solved by using a device that includes the features of claim 1 of the claims, as well as a method that includes the features of clause 14 of the claims. Preferred embodiments of the invention are set forth below in the respective dependent claims.

According to the invention, at least one device for adjusting the position is effectively connected with at least one deforming tool acting on the pipe from the outside, and the device for adjusting the position is also associated with a measuring device. This is preferably done due to the intermediate switching on of the control system between the position control device and the measuring device, this control system being particularly preferably connected to the data memory for the settings and / or operating parameters.

Due to this, according to the invention, a device for producing pipes by cold pilger is provided, capable of operating in real time and which is able, preferably almost without delay, to detect the result of the deformation and, if necessary, errors that occur, and preferably during the ongoing deformation process, to take appropriate counter measures for correction.

At the same time, not only the current deformation process can be continuously monitored, on the contrary, there is also the opportunity to almost immediately evaluate and monitor the correction and adjustment measures taken if necessary, and thereby also introduce and carry out additional adjustments required if necessary.

A device for adjusting the position for this is connected to at least one deforming tool, for example, at least one outer roll acting on the pipe from the outside, and due to this, it can, in a desirable manner and preferably in real time using a measuring device, act on setting the roll gap and adjusting.

In a preferred embodiment of the invention, a deviation of the outside diameter of the pipe from a predetermined value or from a tolerance range is established during the deformation process. This is particularly advantageous when comparing measurement data with predetermined values and comparison data stored in a control system and, in particular, in its storage device. Thus, a device is created that automatically controls the adherence to the required tolerances throughout the process and preferably also ensures that appropriate measures are taken.

The measuring device is preferably an optical measuring system, such as a laser measuring device, by which a reliable and non-destructive measurement of the outer diameter of a cold pilger pipe in real time is possible using particularly readily available means and when achieving particularly accurate measurement results.

Usually the outer diameter is determined not only in the rigidly installed position of the pipe. On the contrary, the cold pilger process involves regular rotation of the pipe around its longitudinal axis. Thus, only by using the preferred rigid arrangement of the measuring device and by using the relative movement of the pipe with respect to this measuring device, which is carried out as a result of this, can the measurement be distributed around the entire perimeter of the deformed pipe. In addition, it is preferable if at a certain point in the pipe not only one measurement is performed, but a large number of measurements during the entire deformation process, for example, while maintaining a given frequency. Thus, when obtaining measurement data using simple means, the effect of certain measurement errors can be minimized.

In a preferred embodiment of the invention, a deforming tool acting on the pipe from the outside is located on at least one device for adjusting the position by means of which the roll gap can be set and preferably also fixed in this position. Due to this, the possibility of additional adjustment of the device is reliably ensured and additional adjustment of the roll gap can be performed automatically preferably during the deformation process.

In a first alternative embodiment of the invention, the position adjusting device may include an electrically adjustable adjustment wedge, by which, using means well mastered and accessible, it is possible to infinitely adjust the roll gap to any suitable shape and thickness.

In a second alternative and also preferred embodiment of the invention, the position adjusting device has an adjustment wedge capable of hydraulically adjusting, moreover, it is preferable to prepare a fluid for the hydraulic system, the fluid pump is mounted on the rolling stand itself. Thanks to this, stepless regulation of the roll gap by means of simply and easily mastered means is also available. The preferred location of the pump on the mill stand itself contributes to the compact design and reduces the length of the fluid piping for the hydraulic system to the required minimum size.

In a third alternative and also preferred embodiment, the regulation and installation of the roll gap is carried out using one or more hydraulic cylinders. Also in this preferred embodiment of the invention, stepless adjustment of the roll gap can be achieved using simple and easily mastered means.

In a fourth alternative and also preferred embodiment of the invention, the roll gap is adjusted by installing at least one backup roll for a deforming tool acting on the pipe from the outside. Due to this, it is excluded that the deforming tool acting from the outside, preferably at least the outer roll, must be adjusted itself and as a result, it is connected with the control device. On the contrary, the adjusting device can be connected to the back-up roll in order to indirectly regulate the roll gap by means of easily and reliably mastered means.

It becomes preferable in this regard, in addition, if the transmission of measurement data and, if necessary, data for control, to one or more devices for position control is carried out by cable. In an alternative and also preferred manner, transmission is possible, however, in a telemetric manner, in order to thereby reduce the amount of cable and the structural space required for this. In this case, during telemetric transmission of measurement data and, if necessary, control data, there is no longer any need for cable encapsulation and cable protection from the effects of the deformation process itself.

Preferably, according to the invention, if not only at least one deforming tool acting on the pipe from the outside is adjustable, but if the rolling mandrel is additionally adjustable in the rolling mill. For this, the rolling mandrel is preferably also connected to a measuring device and, if necessary, to a control system. This ensures that all the tools involved in the deformation process can accordingly be adjusted relative to each other so that the best possible deformation result can be achieved. The flexibility of the device to the extent that it responds to deviations in the wall thickness and / or outer diameter of the pipe from predetermined values is advantageously enhanced by this embodiment.

According to a second aspect of the invention, there is provided a method for manufacturing pipes by cold pilgrimage using a rolling mill, which has at least one rolling mandrel located on at least one mandrel support, as well as at least two deforming tools acting on the pipe from the outside, preferably external rolls, as well as a measuring device for determining pipe wall thickness during the deformation process. According to the invention, at least one device for adjusting the position of a deforming tool acting on the pipe from the outside always makes a position control if the measuring device associated with it detects the deviation of the outer diameter of the deformed pipe from a predetermined value or from a tolerance range.

Preferably, in order to carry out the method according to the invention, the position control device is connected not only with the measuring device, but also with the control system.

The advantages achieved by the method according to the invention and the effects that arise are those which were initially described in relation to the first aspect of the invention.

The method according to the invention advantageously allows fully automatic registration of the outer diameter of the deformed pipe and, if necessary, correcting the correspondingly detected deviations by re-adjusting the roll gap between the outer rolls.

Preferably in this regard, if the outer diameter is determined along the entire perimeter of the pipe and in addition along its entire length, and for this purpose at least one measuring device is provided inside the device, preferably a precisely fixed measuring device. Due to the fact that during the deformation process, at each feed inside the rolling mill, the pipe partially rotates around its longitudinal axis, due to the rigidly installed measuring device, it becomes possible to cover the entire perimeter of the deformed pipe. This is also done with the help of particularly simple means and nonetheless provides a reliable result of measuring the outer diameter of the entire pipe.

It is preferable, finally, if during the method according to the invention not only the outer rolls are regulated, but also the rolling mandrel mounted with the possibility of regulation to counteract deviations of the wall thickness from the set value and tolerance range. Due to this, the flexibility of the installation and method according to the invention is particularly preferably increased in order to respond to deviations of any kind and in any place by effective means.

The invention is explained in more detail below with reference to the attached 14 figures of the drawing.

The figures show:

figure 1 view of the rolling mill in the first embodiment of the invention in a schematic representation;

figure 2 is a view of a part of the device according to the invention in accordance with the first embodiment in a schematic representation;

3 is a view of a rolling stand according to a second embodiment of the invention in a schematic representation;

4 is a view of a rolling stand according to a third embodiment of the invention in a schematic representation;

5 is a view of a portion of a device according to the invention in accordance with a third embodiment of the invention in a schematic representation;

6 is a view of a rolling stand according to a fourth embodiment of the invention in a schematic representation;

7 is a view of a rolling stand according to a fifth embodiment of the invention in a schematic representation;

Fig.8 is a view of a rolling stand according to a sixth embodiment of the invention in a schematic representation;

Fig.9 is a view of a rolling stand according to a seventh embodiment of the invention in a schematic representation;

10 is a view of a rolling stand according to an eighth embodiment of the invention in a schematic representation;

11 is a view of a rolling stand according to a ninth embodiment of the invention in a schematic representation;

12 is a view of a rolling stand according to a tenth embodiment of the invention in a schematic representation;

13 is a view of a rolling stand according to an eleventh embodiment of the invention in a schematic representation;

Fig. 14 is a view of a rolling stand according to a twelfth embodiment of the invention in a schematic representation.

Figure 1 shows a schematic view of a rolling stand 4 for cold pilger tubes according to the first embodiment of the invention. Inside the rolling stand 4, there is an upper outer or work roll 4a and a lower outer or work roll 4b so that there is a roll gap S between them for holding the rolling mandrel (not shown) and for drawing out with compression (not shown) the pipe to a predetermined transverse section and predetermined wall thickness. The upper outer roller 4a is mounted upward and downwardly with a clamping wedge 7a so that the roll gap S can be set appropriately. The clamping wedge 7a can be moved in a rotational motion that is effectively connected to the wedge 7a of the spindle 14, which extends through the entire frame 4 stands and clamping wedge 7a. The rotation of the spindle 14 facilitates the movement of the clamping wedge left or right and the sliding of the inclined surface of the clamping wedge 7a relative to the complementary inclined surface of the clamping wedge 7b, which is directly connected to the cushion of the outer roll 4a.

FIG. 2 shows a rolling stand 4 according to the embodiment of FIG. 1, with a pipe 8 extending between the upper work roll 4a and the lower work roll 4b. The rolling mandrel, also used in the cold pilger method, is not shown to simplify the image. The pipe 8 in the drawing passes from left to right through the roll gap S between the upper work roll 4a and the lower work roll 4b and, after deformation, is passed to the measuring device 5, which determines the outer diameter of the pipe 8. The measurement data from the measuring device 5 enters the control system 6 which, if necessary, after accessing the relevant operating data, issues a control command to adjust the roll gap S by moving the upper work roll 4a in the direction of arrow 15.

FIG. 3 shows a schematic side view of a rolling stand 4 according to a second embodiment of the invention, wherein the adjusting wedge 7a for the upper roll 4a can be moved by electric or hydraulic motors 16, 17 so as to ultimately adjust the roll gap S in a desired manner.

Figure 4 shows in a schematic view a side view of the rolling stand 4 in the third embodiment of the invention, in which, unlike the first and second embodiments according to figures 1-3, lateral movement of the adjusting wedge 7a by means of hydraulic cylinders 18, 19. Also in this case, the lateral movement of the wedge 7a in the horizontal direction facilitates the vertical movement of the upper work roll 4a and, thus, the setting of the roll gap S in the desired manner.

5 shows an embodiment of the rolling stand 4 of FIG. 4, in which the pump 20, which is again driven by the pump motor 21, controls the flow of oil to the hydraulic cylinders 18, 19. Preferably, both the pump 20 and the motor 21 are rigidly connected to the rolling stand 4, in order to thereby limit the structural space of rolling stand 4 with all additional units.

6 shows a schematic side view of a rolling stand 4 according to a fourth embodiment of the invention. The hydraulic cylinder 22 directly and without the use of clamping wedges or the like serves as a support element for the upper work roll 4, and is also suitable for the desired adjustment of the roll gap S. The piston is moved vertically inside the hydraulic cylinder 22 by supplying the hydraulic fluid under pressure P from an external source .

FIG. 7 shows a schematic side view of a rolling stand 4 according to a fifth embodiment of the invention. The setting of the roll gap S by moving the upper work roll 4a is carried out using the spindle 23, which serves as a support element for the upper work roll 4a. The spindle 23 is driven by the motor 24 and thereby contributes not only to the stepless adjustment of the roll gap S along the height of the work roll 4a, but also to the fixation of the upper work roll 4a in the desired position.

Fig. 8 shows a schematic side view of a rolling stand 4 according to a sixth embodiment of the invention, wherein power supply to the servo drive is refused. It is understood that this embodiment can suitably be combined with the embodiments of FIGS. 1-7. The energy supply to the rolling stand 4 is carried out from an external source 25 to the connecting element 26, rigidly connected with the rolling stand. From this connecting member 26, energy is available for delivery to a servo drive (not shown) for the upper outer roll 4a.

Fig. 9 shows a schematic side view of a rolling stand 4 in a seventh embodiment of the invention, in which case, as in Fig. 8, the electric power supply to the rolling stand 4 and its (not shown) servo for the upper roll 4a are refused. . Thus, this seventh embodiment of the invention can also be appropriately combined with the embodiments of FIGS. 1-7. The supply of electrical energy is carried out in the case shown here in an inductive way, and the electric wire 27 and the consumer 28, which is connected to the rolling stand 4, are interconnected in such a way that a voltage is induced in the consumer 28 without contact with the wire 27, which is sufficient to supply a servo drive (not shown) for the upper outer roll 4a to adjust the roll gap accordingly.

10 shows in a schematic view a side view of a rolling stand 4 according to an eighth embodiment of the invention. Also in this embodiment, they refuse to supply energy to the rolling stand and, in particular, to its servo drive (not shown) for the upper outer roll 4a. Thus, also this eighth embodiment can accordingly be combined with the embodiments presented in FIGS. 1-7. In this eighth embodiment, energy is supplied to the rolling stand 4 hydraulically by means of an immersion pipe 29, which is supplied externally with hydraulic fluid under pressure P. The submersible pipe 29 has two openings on its upper side through which hydraulic fluid can flow into a fluid reservoir 30 slidably disposed on a dip tube 29. This fluid reservoir is rigidly connected to the rolling stand 4 and has an opening on its underside 30a, through which hydraulic fluid can be supplied under pressure P to a servo drive (not shown) for the upper outer roll 4a.

11 shows a schematic side view of a rolling stand 4 according to a ninth embodiment of the invention. Also in this ninth embodiment, they refuse to supply energy to the (not shown) servo drive of the rolling stand, in particular its upper outer roll 4a. Thus, also this ninth embodiment can, if necessary, be combined with the embodiments of the invention shown in FIGS. 1-7. The energy is supplied by an electric or hydraulic method, shown schematically, moreover, to supply electric or hydraulic energy, the energy source 31 and / or pressure accumulator 32 is rigidly connected to the rolling stand 4.

12 shows a schematic side view of a rolling stand 4 according to a tenth embodiment of the invention. This tenth embodiment eliminates the transmission of measurement data and control data from the (not shown) measuring device and / or (not shown) control system to the (not shown) servo drive of the rolling stand 4, in particular, to the servo drive of the upper outer roll 4a. Thus, it goes without saying that this tenth embodiment of the invention can be combined accordingly with the embodiments presented in FIGS. 1-11. The transmission of measurement data and control data shown here is carried out by cable transmission or telemetry, and in the preferred tenth embodiment of the invention, telemetric, non-contact data transmission from a (not shown) measuring device and / or (not shown) control system is carried out using a transmitter 33 to the receiver 34 associated with the rolling stand 4.

13 shows a schematic side view of a rolling stand 4 according to an eleventh embodiment of the invention. Other than in the execution forms presented before, the rolling stand 4 has a pair of work rolls 4a, 4b arranged to move accordingly, which are supported respectively by the support rolls 35a, 35b inside the rolling stand 4. These support rolls again move to support beams 36a, 36b arranged to be movable in height and / or tilted inside the rolling stand 4, and due to the corresponding movement of the support beams 36a, 36b in height and / or their inclination can also be adjusted a roll gap S between the upper and lower rolls 4a, 4b. In particular, in the case of a rolling stand arranged to move laterally along the longitudinal orientation of the support beams 36a, 36b, with the corresponding orientation of the support beams 36a, 36b, it becomes possible to adjust the rolling of the support rolls 35a, 35b along the support beams 36a, 36b and either permanent adjustment the roll gap S, or the locally variable setting of the roll gap S depending on the location of the rolling stand 4 along the support beams 36a, 36b. For a specialist it goes without saying that the eleventh embodiment presented here can accordingly be combined also with features in accordance with figures 1-12.

Fig. 14 shows a schematic side view of a rolling stand 4 according to a twelfth embodiment of the invention. In this solution, a gear wheel or a pair of gears 37 moving together with a rolling stand slides on a rigidly mounted shaft 38. Changes in the roll gap S can therefore be transmitted from the rigidly mounted motor 39 to the adjusting wedge 7a, and the adjusting wedge 7a is in effective communication with the pair 37 of gears via the spindle 40.

Claims (20)

1. Device (1) for the manufacture of pipes (8) by cold pilgrimage using a rolling mill, including a rolling mandrel (2) located on at least one counter support for the mandrel, as well as at least two deforming tools (4) externally acting on the pipe, preferably at least one work roll (4a, 4b), and a measuring device (5) for determining the outer diameter of the pipe (8) during deformation, characterized in that it contains at least one device (7 ) to regulate associated with at least one deforming tool (4), acting on the pipe (8) from the outside, while the device (7) for adjusting the position is associated with the said measuring device (5). 2. The device (1) according to claim 1, characterized in that the device (7) for adjusting the position is connected with the measuring device (5) by means of a control system (6). 3. The device (1) according to claim 2, characterized in that the control system (6) is connected to a data memory for installation and / or operating parameters. 4. The device (1) according to any one of claims 1 to 3, characterized in that in it, preferably during the deformation process, a deviation of the pipe wall thickness from the set value or from the tolerance region can be established. 5. The device (1) according to any one of claims 1 to 3, characterized in that the measuring device (5) is a laser measuring device. 6. Device (1) according to any one of claims 1 to 3, characterized in that the deforming tool (4) acting on the pipe (8) from the outside is located on at least one device (7) for adjusting the position by which to establish and preferably fix the gap (S) during rolling between the deforming tool (4) and the pipe (8). 7. The device (1) according to claim 6, characterized in that the device (7) for adjusting the position includes an electrically adjustable adjustment wedge (7a, 7b). 8. The device (1) according to claim 6, characterized in that the device (7) for adjusting the position includes a hydraulically adjustable adjustment wedge (7a, 7b), and preferably the pump (20) for the fluid for the hydraulic system is located on the rolling crates. 9. The device (1) according to claim 6, characterized in that the device (7) for adjusting the position includes a hydraulic cylinder (22) for regulating and setting the roll gap (S). 10. The device (1) according to claim 6, characterized in that the device (7) for adjusting the position by means of at least one mounted back-up roll (35a, 35b) is effectively connected with at least one deforming tool (4) acting on the pipe (8) outside, preferably with at least one roll (4a, 4b). 11. The device (1) according to any one of claims 1 to 3, characterized in that the transmission of measurement data and, if necessary, control data is carried out by cable or telemetry. 12. The device (1) according to any one of paragraphs. 1-3, characterized in that the additional rolling mandrel (2) is located in the rolling mill with the possibility of movement. 13. The device (1) according to item 12, characterized in that the rolling mandrel (2) is also associated with a measuring device (5) and, if necessary, with a control system (6). 14. A method (1) for producing pipes (8) by cold pilger using a rolling mill, including a rolling mandrel (2) located on at least one mandrel support, as well as at least two deforming tools (4) outside the pipe (8), preferably at least one work roll (4a, 4b), and a measuring device (5) for determining the outer diameter of the pipe (8) during deformation, characterized in that at least one device (7) for adjusting the position for deforming about the tool (4) acting on the pipe (8) from the outside, preferably for at least one roll (4a, 4b), is connected with the said measuring device (5), and the position of the deforming tool (4) is adjusted when the set wall thickness is deviated in the measuring device (5) from the set value or from the tolerance range. 15. The method according to 14, characterized in that the control system (6) is connected with a measuring device (5) and a device (7) for adjusting the position. 16. The method according to 14, characterized in that the regulation of the position of the deforming tool (4), acting on the pipe from the outside, is carried out in the process of deformation. 17. The method according to any one of paragraphs.14-16, characterized in that they measure the diameter of the pipe by a laser method. 18. The method according to any one of paragraphs.14-16, characterized in that the outer diameter is determined around the entire perimeter of the pipe (8). 19. The method according to p. 18, characterized in that at least one measurement, preferably at least five measurements, is carried out at each feed and / or each partial rotation of the pipe (8) around its longitudinal axis inside the rolling mill. 20. The method according to any one of paragraphs.14-16, characterized in that it further adjusts the position of the rolling mandrel (2) to counteract deviations of the wall thickness from a predetermined value or from a tolerance range.

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